April 19th in stamps James Cook, Note on the Theory of Diffraction, Lord Byron, Treaty of London, Konrad Adenauer, José Echegaray

Here are some events that happened on April 19th. It could be an event or a person that died or was born on that day

1770 – Captain James Cook, still holding the rank of lieutenant, sights the eastern coast of what is now Australia.

Captain James Cook (7 November 1728 – 14 February 1779) was a British explorer, navigator, cartographer, and captain in the Royal Navy. He made detailed maps of Newfoundland prior to making three voyages to the Pacific Ocean, during which he achieved the first recorded European contact with the eastern coastline of Australia and the Hawaiian Islands, and the first recorded circumnavigation of New Zealand.

Cook joined the British merchant navy as a teenager and joined the Royal Navy in 1755. He saw action in the Seven Years' War and subsequently surveyed and mapped much of the entrance to the Saint Lawrence River during the siege of Quebec, which brought him to the attention of the Admiralty and Royal Society. This acclaim came at a crucial moment in his career and the direction of British overseas exploration, and led to his commission in 1766 as commander of HM Bark Endeavour for the first of three Pacific voyages.

In these voyages, Cook sailed thousands of miles across largely uncharted areas of the globe. He mapped lands from New Zealand to Hawaii in the Pacific Ocean in greater detail and on a scale not previously charted by Western explorers. He surveyed and named features, and recorded islands and coastlines on European maps for the first time. He displayed a combination of seamanship, superior surveying and cartographic skills, physical courage, and an ability to lead men in adverse conditions.

Cook was attacked and killed in 1779 during his third exploratory voyage in the Pacific while attempting to kidnap the Island of Hawaii's monarch, Kalaniʻōpuʻu, in order to reclaim a cutter stolen from one of his ships. He left a legacy of scientific and geographical knowledge that influenced his successors well into the 20th century, and numerous memorials worldwide have been dedicated to him.

Stamps from Australia, Cook Islands and the United States depicting James Cook

1818 – French physicist Augustin Fresnel signs his preliminary "Note on the Theory of Diffraction" (deposited on the following day). The document ends with what we now call the Fresnel integrals.

Augustin-Jean Fresnel (10 May 1788 – 14 July 1827) was a French civil engineer and physicist whose research in optics led to the almost unanimous acceptance of the wave theory of light, excluding any remnant of Newton's corpuscular theory, from the late 1830s  until the end of the 19th century. He is perhaps better known for inventing the catadioptric (reflective/refractive) Fresnel lens and for pioneering the use of "stepped" lenses to extend the visibility of lighthouses, saving countless lives at sea. The simpler dioptric (purely refractive) stepped lens, first proposed by Count Buffon  and independently reinvented by Fresnel, is used in screen magnifiers and in condenser lenses for overhead projectors.

By expressing Huygens's principle of secondary waves and Young's principle of interference in quantitative terms, and supposing that simple colors consist of sinusoidal waves, Fresnel gave the first satisfactory explanation of diffraction by straight edges, including the first satisfactory wave-based explanation of rectilinear propagation. Part of his argument was a proof that the addition of sinusoidal functions of the same frequency but different phases is analogous to the addition of forces with different directions. By further supposing that light waves are purely transverse, Fresnel explained the nature of polarization, the mechanism of chromatic polarization, and the transmission and reflection coefficients at the interface between two transparent isotropic media. Then, by generalizing the direction-speed-polarization relation for calcite, he accounted for the directions and polarizations of the refracted rays in doubly-refractive crystals of the biaxial class (those for which Huygens's secondary wavefronts are not axisymmetric). The period between the first publication of his pure-transverse-wave hypothesis, and the submission of his first correct solution to the biaxial problem, was less than a year.

Later, he coined the terms linear polarization, circular polarization, and elliptical polarization, explained how optical rotation could be understood as a difference in propagation speeds for the two directions of circular polarization, and (by allowing the reflection coefficient to be complex) accounted for the change in polarization due to total internal reflection, as exploited in the Fresnel rhomb. Defenders of the established corpuscular theory could not match his quantitative explanations of so many phenomena on so few assumptions.

Fresnel had a lifelong battle with tuberculosis, to which he succumbed at the age of 39. Although he did not become a public celebrity in his lifetime, he lived just long enough to receive due recognition from his peers, including (on his deathbed) the Rumford Medal of the Royal Society of London, and his name is ubiquitous in the modern terminology of optics and waves. After the wave theory of light was subsumed by Maxwell's electromagnetic theory in the 1860s, some attention was diverted from the magnitude of Fresnel's contribution. In the period between Fresnel's unification of physical optics and Maxwell's wider unification, a contemporary authority, Humphrey Lloyd, described Fresnel's transverse-wave theory as "the noblest fabric which has ever adorned the domain of physical science, Newton's system of the universe alone excepted."

French stamp depicting Augustin Fresnel

1824 Died: Lord Byron, English-Scottish poet and playwright (b. 1788)

George Gordon Byron, 6th Baron Byron (22 January 1788 – 19 April 1824), known simply as Lord Byron, was an English peer, who was a poet and politician. He was one of the leading figures of the Romantic movement and is regarded as one of the greatest English poets. He remains widely read and influential. Among his best-known works are the lengthy narrative poems Don Juan and Childe Harold's Pilgrimage; many of his shorter lyrics in Hebrew Melodies also became popular.

He travelled extensively across Europe, especially in Italy, where he lived for seven years in the cities of Venice, Ravenna, and Pisa. During his stay in Italy he frequently visited his friend and fellow poet Percy Bysshe Shelley. Later in life Byron joined the Greek War of Independence fighting the Ottoman Empire and died of disease leading a campaign during that war, for which Greeks revere him as a national hero. He died in 1824 at the age of 36 from a fever contracted after the First and Second Siege of Missolonghi.

His only marital child, Ada Lovelace, is regarded as a foundational figure in the field of computer programming based on her notes for Charles Babbage's Analytical Engine. Byron's extramarital children include Allegra Byron, who died in childhood, and possibly Elizabeth Medora Leigh, daughter of his half-sister Augusta Leigh.

Stamps from Greece, Hungary and Russia depicting Lord Byron

1832 Born: José Echegaray, Spanish engineer, mathematician, and playwright, Nobel Prize laureate (d. 1916)

José Echegaray y Eizaguirre (19 April 1832 – 14 September 1916) was a Spanish civil engineer, mathematician, statesman, and one of the leading Spanish dramatists of the last quarter of the 19th century. He was awarded the 1904 Nobel Prize for Literature "in recognition of the numerous and brilliant compositions which, in an individual and original manner, have revived the great traditions of the Spanish drama".

Theater had always been the love of José Echegaray's life. Although he had written earlier plays (La Hija natural and La Última Noche, both in 1867), he truly became a dramatist in 1874. His plays reflected his sense of duty, which had made him famous during his time in the governmental offices. Dilemmas centered on duty and morality are the motif of his plays. He replicated the achievements of his predecessors of the Spanish Golden Age, remaining a prolific playwright.

His most famous play is El gran Galeoto, a drama written in the grand nineteenth century manner of melodrama. It is about the poisonous effect that unfounded gossip has on a middle-aged man's happiness. Echegaray filled it with elaborate stage instructions that illuminate what we would now consider a hammy style of acting popular in the 19th century. Paramount Pictures filmed it as a silent with the title changed to The World and His Wife, and it was the basis for a later film The Great Galeoto. His most remarkable plays are O locura o santidad (Saint or Madman?, 1877); Mariana (1892); El estigma (1895); La duda, 1898; and El loco Dios (God, the fool, 1900).

Among his other famous plays are La esposa del vengador (1874) (The Avenger's Wife); En el puño de la espada (1875) (In the Sword's Handle); En el pilar y en la cruz (1878) (On the Stake and on the Cross); and Conflicto entre dos deberes (1882) (Conflict of Two Duties).

Along with the Provençal poet Frédéric Mistral, he was awarded the Nobel Prize for Literature in 1904, after having been nominated that year by a member of the Royal Spanish Academy, making him the first Spaniard to win the prize.

José Echegaray maintained constant activity until his death on 14 September 1916 in Madrid. His extensive work did not stop growing in his old age: in the final stage of his life he wrote 25 or 30 mathematical physics volumes. At the age of 83 he commented:

I cannot die, because if I am going to write my mathematical physics encyclopedia, I need at least 25 more years.

Swedish stamp depicting Echegaray 

1839 – The Treaty of London establishes Belgium as a kingdom and guarantees its neutrality.

The Treaty of London of 1839, also called the First Treaty of London, the Convention of 1839, the Treaty of Separation, the Quintuple Treaty of 1839, or the Treaty of the XXIV articles, was a treaty signed on 19 April 1839 between the Concert of Europe, the United Kingdom of the Netherlands and the Kingdom of Belgium. It was a direct follow-up to the 1831 Treaty of the XVIII Articles which the Netherlands had refused to sign, and the result of negotiations at the London Conference of 1838–1839.

Under the treaty, the European powers recognised and guaranteed the independence and neutrality of Belgium and established the full independence of the German-speaking part of Luxembourg. Article VII required Belgium to remain perpetually neutral, and by implication committed the signatory powers to guard that neutrality in the event of invasion.

Stamps from Belgium depicting Leopold I who was the first King of the Belgians

1967 Died: Konrad Adenauer, German politician, 1st Chancellor of Germany (b. 1876)

Konrad Hermann Joseph Adenauer (German: [ˈkɔnʁaːt ˈʔaːdənaʊɐ] (About this soundlisten); 5 January 1876 – 19 April 1967) was a German statesman who served as the first Chancellor of the Federal Republic of Germany (West Germany) from 1949 to 1963. He was co-founder and first leader of the Christian Democratic Union (CDU) (until 1966), a Christian Democratic party that under his leadership became one of the most influential parties in the country.

In the early years of the Federal Republic he switched focus from denazification to recovery and led his country from the ruins of World War II to becoming a productive and prosperous nation that forged close relations with France, the United Kingdom and the United States.  During his years in power, West Germany achieved democracy, stability, international respect and economic prosperity ("Wirtschaftswunder", German for "economic miracle").

Adenauer belied his age by his intense work habits and his uncanny political instinct. He displayed a strong dedication to a broad vision of market-based liberal democracy and anti-communism. A shrewd politician, Adenauer was deeply committed to a Western-oriented foreign policy and restoring the position of West Germany on the world stage. He worked to restore the West German economy from the destruction of World War II to a central position in Europe, presiding over the German Economic Miracle together with his Minister of Economics, Ludwig Erhard. He was a driving force in re-establishing national military forces (the Bundeswehr) in West Germany since 1955. Adenauer opposed rival East Germany and made his nation a member of NATO and a member of the Western Alliance.

Adenauer, who was Chancellor until age 87, was dubbed "Der Alte" ("the elder"). British politician and historian Roy Jenkins says he was "the oldest statesman ever to function in elected office." He remains the oldest head of government for a major country.

A devout Roman Catholic and member of the Catholic Centre Party, he was a leading politician in the Weimar Republic, serving as Mayor of Cologne (1917–1933) and as president of the Prussian State Council (1922–1933).

April 18th in stamps Joan of Arc is beatified, Justus von Liebig, Roland Garros shot down

Here are some events that happened on April 18th. It could be an event or a person that died or was born on that day

1909 – Joan of Arc is beatified in Rome.

Joan of Arc (French: Jeanne d'Arc; c. 1412 – 30 May 1431), nicknamed "The Maid of Orléans" (French: La Pucelle d'Orléans) or "Maid of Lorraine" (French: La Pucelle de Lorraine), is considered a heroine of France for her role during the Lancastrian phase of the Hundred Years' War, and was canonized as a saint. She was born to Jacques d'Arc and Isabelle Romée, a peasant family, at Domrémy in the Vosges of northeast France. Joan said that she received visions of the archangel Michael, Saint Margaret, and Saint Catherine of Alexandria instructing her to support Charles VII and recover France from English domination late in the Hundred Years' War. The as-yet-unanointed King Charles VII sent Joan to the Siege of Orléans as part of a relief army. She gained prominence after the siege was lifted only nine days later. Several additional swift victories led to Charles VII's consecration at Reims. This long-awaited event boosted French morale and paved the way for the final French victory at Castillon in 1453.

On 23 May 1430, she was captured at Compiègne by the Burgundian faction, a group of French nobles allied with the English. She was later handed over to the English and put on trial by the pro-English bishop Pierre Cauchon on a variety of charges. After Cauchon declared her guilty, she was burned at the stake on 30 May 1431, dying at about nineteen years of age.

In 1456, an inquisitorial court authorized by Pope Callixtus III examined the trial, debunked the charges against her, pronounced her innocent, and declared her a martyr. In the 16th century she became a symbol of the Catholic League, and in 1803 she was declared a national symbol of France by the decision of Napoleon Bonaparte. She was beatified in 1909 and canonized in 1920. Joan of Arc is one of the nine secondary patron saints of France, along with Saint Denis, Saint Martin of Tours, Saint Louis, Saint Michael, Saint Rémi, Saint Petronilla, Saint Radegund and Saint Thérèse of Lisieux.

Joan of Arc has remained a popular figure in literature, painting, sculpture, and other cultural works since the time of her death, and many famous writers, playwrights, filmmakers, artists, and composers have created, and continue to create, cultural depictions of her.

French stamp depicting Joan of Arc 

1873 Died: Justus von Liebig, German chemist and academic (b. 1803)

Justus Freiherr von Liebig (12 May 1803 – 18 April 1873) was a German scientist who made major contributions to agricultural and biological chemistry, and was considered the founder of organic chemistry. As a professor at the University of Giessen, he devised the modern laboratory-oriented teaching method, and for such innovations, he is regarded as one of the greatest chemistry teachers of all time. He has been described as the "father of the fertilizer industry" for his emphasis on nitrogen and trace minerals as essential plant nutrients, and his formulation of the law of the minimum, which described how plant growth relied on the scarcest nutrient resource, rather than the total amount of resources available. He also developed a manufacturing process for beef extracts, and with his consent a company, called Liebig Extract of Meat Company, was founded to exploit the concept; it later introduced the Oxo brand beef bouillon cube. He popularized an earlier invention for condensing vapors, which came to be known as the Liebig condenser.

German stamp depicting Justus von Liebig

1915 – French pilot Roland Garros is shot down and glides to a landing on the German side of the lines during World War I.

Eugène Adrien Roland Georges Garros (6 October 1888 – 5 October 1918) was a French pioneering aviator and fighter pilot during World War I and early days of aviation. In 1928, the Roland Garros tennis stadium was named in his memory; the French Open tennis tournament takes the name of Roland-Garros from the stadium in which it is held.

On 23 September 1913 Roland Garros gained fame for making the first non-stop flight across the Mediterranean Sea from Fréjus-Saint Raphaël in the south of France to Bizerte in Tunisia in a Morane-Saulnier G. The flight commenced at 5:47 am and lasted nearly eight hours during which Garros had to solve two engine malfunctions. The following year, Garros joined the French army at the outbreak of World War I

Stamps from France and Monaco depicting Roland Garros and or his plane or the stadium named after him

April 17th in stamps Trial of Martin Luther, Verrazzano, Benjamin Franklin, Ellis Island immigration center processes 11,747 people, Jean Baptiste Perrin

Here are some events that happened on April 17th. It could be an event or a person that died or was born on that day

1521 – Trial of Martin Luther over his teachings begins during the assembly of the Diet of Worms. Initially intimidated, he asks for time to reflect before answering and is given a stay of one day.

Martin Luther (10 November 1483 – 18 February 1546) was a German professor of theology, composer, priest, monk, and a seminal figure in the Protestant Reformation.

Luther was ordained to the priesthood in 1507. He came to reject several teachings and practices of the Roman Catholic Church; in particular, he disputed the view on indulgences. Luther proposed an academic discussion of the practice and efficacy of indulgences in his Ninety-five Theses of 1517. His refusal to renounce all of his writings at the demand of Pope Leo X in 1520 and the Holy Roman Emperor Charles V at the Diet of Worms in 1521 resulted in his excommunication by the pope and condemnation as an outlaw by the Holy Roman Emperor.

Luther taught that salvation and, consequently, eternal life are not earned by good deeds but are received only as the free gift of God's grace through the believer's faith in Jesus Christ as redeemer from sin. His theology challenged the authority and office of the Pope by teaching that the Bible is the only source of divinely revealed knowledge, and opposed sacerdotalism by considering all baptized Christians to be a holy priesthood. Those who identify with these, and all of Luther's wider teachings, are called Lutherans, though Luther insisted on Christian or Evangelical (German: evangelisch) as the only acceptable names for individuals who professed Christ.

His translation of the Bible into the German vernacular (instead of Latin) made it more accessible to the laity, an event that had a tremendous impact on both the church and German culture. It fostered the development of a standard version of the German language, added several principles to the art of translation, and influenced the writing of an English translation, the Tyndale Bible. His hymns influenced the development of singing in Protestant churches. His marriage to Katharina von Bora, a former nun, set a model for the practice of clerical marriage, allowing Protestant clergy to marry.

In two of his later works, Luther expressed antagonistic views towards Jews. His rhetoric was not directed at Jews alone, but also towards Roman Catholics, Anabaptists, and nontrinitarian Christians. Luther died in 1546 with Pope Leo X's excommunication still effective.


Stamps from several countries depicting Martin Luther

1524 – Giovanni da Verrazzano reaches New York harbor.

Giovanni da Verrazzano (1485–1528) was a Florentine explorer of North America, in the service of King Francis I of France.

He is renowned as the first European to explore the Atlantic coast of North America between Florida and New Brunswick in 1524, including New York Bay and Narragansett Bay.

Despite his discoveries, Verrazzano's reputation did not proliferate as much as other explorers of that era. For example, Verrazzano gave the European name Francesca to the new land that he had seen, in accordance with contemporary practices, after the French king in whose name he sailed. That and other names that he bestowed on features that he discovered have not survived. He had the misfortune of making major discoveries in the same three years (1519 to 1521) that the dramatic Conquest of Mexico and Ferdinand Magellan's circumnavigation of the world occurred. Magellan himself did not complete his voyage, but his publicist Antonio Pigafetta did so, and Spanish publicity outweighed the news of the French voyage.

In the 19th and the early 20th centuries, there was a great debate in the United States about the authenticity of the letters that he wrote to Francis I to describe the geography, flora, fauna, and native population of the east coast of North America. Others thought that they were authentic, almost universally the current opinion, particularly after the discovery of a letter signed by Francis I, which referred to Verrazzano's letter.

Verrazzano's reputation was particularly obscure in New York City, where the 1609 voyage of Henry Hudson on behalf of the Dutch Republic came to be regarded as the de facto start of European exploration of New York. It was only by a great effort in the 1950s and 1960s that Verrazzano's name and reputation were re-established as the European discoverer of the harbor, during an effort to name the newly built Narrows bridge after him.

Italian stamps depicting Giovanni da Verrazzano and the Verrazzano  bridge

1790 Died: Benjamin Franklin, American inventor, publisher, and politician, 6th President of Pennsylvania (b. 1706)

Benjamin Franklin (January 17, 1706 - April 17, 1790) was a British American polymath and one of the Founding Fathers of the United States. Franklin was a leading writer, printer, political philosopher, politician, Freemason, postmaster, scientist, inventor, humorist, civic activist, statesman, and diplomat. As a scientist, he was a major figure in the American Enlightenment and the history of physics for his discoveries and theories regarding electricity. As an inventor, he is known for the lightning rod, bifocals, and the Franklin stove, among other inventions. He founded many civic organizations, including the Library Company, Philadelphia's first fire department, and the University of Pennsylvania.

Franklin earned the title of "The First American" for his early and indefatigable campaigning for colonial unity, initially as an author and spokesman in London for several colonies. As the first United States ambassador to France, he exemplified the emerging American nation. Franklin was foundational in defining the American ethos as a marriage of the practical values of thrift, hard work, education, community spirit, self-governing institutions, and opposition to authoritarianism both political and religious, with the scientific and tolerant values of the Enlightenment. In the words of historian Henry Steele Commager, "In a Franklin could be merged the virtues of Puritanism without its defects, the illumination of the Enlightenment without its heat." To Walter Isaacson, this makes Franklin "the most accomplished American of his age and the most influential in inventing the type of society America would become."

Franklin became a successful newspaper editor and printer in Philadelphia, the leading city in the colonies, publishing the Pennsylvania Gazette at the age of 23. He became wealthy publishing this and Poor Richard's Almanack, which he authored under the pseudonym "Richard Saunders". After 1767, he was associated with the Pennsylvania Chronicle, a newspaper that was known for its revolutionary sentiments and criticisms of the policies of the British Parliament and the Crown.

He pioneered and was the first president of Academy and College of Philadelphia which opened in 1751 and later became the University of Pennsylvania. He organized and was the first secretary of the American Philosophical Society and was elected president in 1769. Franklin became a national hero in America as an agent for several colonies when he spearheaded an effort in London to have the Parliament of Great Britain repeal the unpopular Stamp Act. An accomplished diplomat, he was widely admired among the French as American minister to Paris and was a major figure in the development of positive Franco–American relations. His efforts proved vital for the American Revolution in securing shipments of crucial munitions from France.

He was promoted to deputy postmaster-general for the British colonies on August 10, 1753, having been Philadelphia postmaster for many years, and this enabled him to set up the first national communications network. During the revolution, he became the first United States postmaster general. He was active in community affairs and colonial and state politics, as well as national and international affairs. From 1785 to 1788, he served as governor of Pennsylvania. He initially owned and dealt in slaves but, by the late 1750s, he began arguing against slavery, became an abolitionist, and promoted education and the integration of blacks in American Society.

His life and legacy of scientific and political achievement, and his status as one of America's most influential Founding Fathers, have seen Franklin honored more than two centuries after his death on the fifty-cent piece, the $100 bill, warships, and the names of many towns, counties, educational institutions, and corporations, as well as numerous cultural references.

US stamps depicting Benjamin Franklin

1907 – The Ellis Island immigration center processes 11,747 people, more than on any other day.

Ellis Island is a federally owned island in New York Harbor that was the United States' busiest immigrant inspection station. From 1892 to 1924, approximately 12 million immigrants arriving at the Port of New York and New Jersey were processed there under federal law. Today, it is part of the Statue of Liberty National Monument, accessible to the public only by ferry. The north side of the island is the site of the main building, now a national museum of immigration. The south side of the island, including the Ellis Island Immigrant Hospital, is only open to the public through guided tours.

In the 19th century, Ellis Island was the site of Fort Gibson and later became a naval magazine. The first inspection station opened in 1892 and was destroyed by fire in 1897. The second station opened in 1900 and housed facilities for medical quarantines as well as processing immigrants. After 1924, Ellis Island was used primarily as a detention center for migrants. During both World War I and World War II its facilities were also used by the United States military to detain prisoners of war. Following the immigration station's closure, the buildings languished for several years until they partially reopened in 1976. The main building and adjacent structures were completely renovated in 1990.

The 27.5-acre (11.1 ha) island was greatly expanded by land reclamation between the late 1890s and the 1930s. Jurisdictional disputes between New Jersey and New York persisted until the 1998 U.S. Supreme Court ruling in New Jersey v. New York.

Stamp and a First Day Cover commemorating Ellis Island and immigrants

1942 Died: Jean Baptiste Perrin, French-American physicist and chemist, Nobel Prize laureate (b. 1870)

Jean Baptiste Perrin  (30 September 1870 – 17 April 1942) was a French physicist who, in his studies of the Brownian motion of minute particles suspended in liquids, verified Albert Einstein’s explanation of this phenomenon and thereby confirmed the atomic nature of matter (sedimentation equilibrium). For this achievement he was honoured with the Nobel Prize for Physics in 1926.

In 1895, Perrin showed that cathode rays were of negative electric charge in nature. He determined Avogadro's number (now known as the Avogadro constant) by several methods. He explained solar energy as due to the thermonuclear reactions of hydrogen.

After Albert Einstein published (1905) his theoretical explanation of Brownian motion in terms of atoms, Perrin did the experimental work to test and verify Einstein's predictions, thereby settling the century-long dispute about John Dalton's atomic theory. Carl Benedicks argued Perrin should receive the Nobel Prize in Physics; Perrin received the award in 1926 for this and other work on the discontinuous structure of matter, which put a definite end to the long struggle regarding the question of the physical reality of molecules.

Perrin was the author of a number of books and dissertations. Most notable of his publications were: "Rayons cathodiques et rayons X"; "Les Principes"; "Electrisation de contact"; "Réalité moléculaire"; "Matière et Lumière"; "Lumière et Reaction chimique".

Perrin was also the recipient of numerous prestigious awards including the Joule Prize of the Royal Society in 1896 and the La Caze Prize of the French Academy of Sciences. He was twice appointed a member of the Solvay Committee at Brussels in 1911 and in 1921. He also held memberships with the Royal Society of London and with the Academies of Sciences of Belgium, Sweden, Turin, Prague, Romania and China. He became a Commander of the Legion of Honour in 1926 and was made Commander of the Order of Léopold (Belgium).

In 1919, Perrin proposed that nuclear reactions can provide the source of energy in stars. He realized that the mass of a helium atom is less than that of four atoms of hydrogen, and that the mass-energy equivalence of Einstein implies that the nuclear fusion (4 H → He) could liberate sufficient energy to make stars shine for billions of years. A similar theory was first proposed by American chemist William Draper Harkins in 1915. It remained for Hans Bethe and Carl Friedrich von Weizsäcker to determine the detailed mechanism of stellar nucleosynthesis during the 1930s.

In 1927, he founded the Institut de Biologie Physico-Chimique together with chemist André Job and physiologist André Mayer. Funding was provided by Edmond James de Rothschild. In 1937, Perrin established the Palais de la Découverte, a science museum in Paris.

Perrin is considered the founding father of the National Centre for Scientific Research (Centre National de la Recherche Scientifique (CNRS)). Following a petition by Perrin signed by over 80 scientists, among them eight Nobel Prize laureates, the French education minister set up the Conseil Supérieur de la Recherche Scientifique (French National Research Council) in April 1933. In 1936, Perrin, now an undersecretary for research, founded the Service Central de la Recherche Scientifique (French Central Agency for Scientific Research). Both institutions were merged under the CNRS umbrella on October 19, 1939.

His notable students include Pierre Victor Auger. Jean Perrin was the father of Francis Perrin, also a physicist.

Stamp issued by Guyana depicting Jean Baptiste Perrin

April 16th in stamps Harriet Quimby, Charlie Chaplin, Anatole France

Here are some events that happened on April 16th. It could be an event or a person that died or was born on that day

1844 Born: Anatole France, French journalist, novelist, and poet, Nobel Prize laureate (d. 1924)

Anatole France (born François-Anatole Thibault, 16 April 1844 – 12 October 1924) was a French poet, journalist, and novelist with several best-sellers. Ironic and skeptical, he was considered in his day the ideal French man of letters. He was a member of the Académie française, and won the 1921 Nobel Prize in Literature "in recognition of his brilliant literary achievements, characterized as they are by a nobility of style, a profound human sympathy, grace, and a true Gallic temperament".

France is also widely believed to be the model for narrator Marcel's literary idol Bergotte in Marcel Proust's In Search of Lost Time.

French and Swedish stamps depicting Anatole France 

1889 Born: Charlie Chaplin, English actor, director, producer, screenwriter, and composer (d. 1977)

Sir Charles Spencer Chaplin (16 April 1889 – 25 December 1977) was an English comic actor, filmmaker, and composer who rose to fame in the era of silent film. He became a worldwide icon through his screen persona, "The Tramp", and is considered one of the most important figures in the history of the film industry. His career spanned more than 75 years, from childhood in the Victorian era until a year before his death in 1977, and encompassed both adulation and controversy.

Chaplin's childhood in London was one of poverty and hardship, as his father was absent and his mother struggled financially, and he was sent to a workhouse twice before the age of nine. When he was 14, his mother was committed to a mental asylum. Chaplin began performing at an early age, touring music halls and later working as a stage actor and comedian. At 19, he was signed to the prestigious Fred Karno company, which took him to America. He was scouted for the film industry and began appearing in 1914 for Keystone Studios. He soon developed the Tramp persona and formed a large fan base. He directed his own films and continued to hone his craft as he moved to the Essanay, Mutual, and First National corporations. By 1918, he was one of the best-known figures in the world.

In 1919, Chaplin co-founded the distribution company United Artists, which gave him complete control over his films. His first feature-length film was The Kid (1921), followed by A Woman of Paris (1923), The Gold Rush (1925), and The Circus (1928). He initially refused to move to sound films in the 1930s, instead producing City Lights (1931) and Modern Times (1936) without dialogue. He became increasingly political, and his first sound film was The Great Dictator (1940), which satirised Adolf Hitler. The 1940s were a decade marked with controversy for Chaplin, and his popularity declined rapidly. He was accused of communist sympathies, and some members of the press and public found his involvement in a paternity suit, and marriages to much younger women, scandalous. An FBI investigation was opened, and Chaplin was forced to leave the United States and settle in Switzerland. He abandoned the Tramp in his later films, which include Monsieur Verdoux (1947), Limelight (1952), A King in New York (1957), and A Countess from Hong Kong (1967).

Chaplin wrote, directed, produced, edited, starred in, and composed the music for most of his films. He was a perfectionist, and his financial independence enabled him to spend years on the development and production of a picture. His films are characterised by slapstick combined with pathos, typified in the Tramp's struggles against adversity. Many contain social and political themes, as well as autobiographical elements. He received an Honorary Academy Award for "the incalculable effect he has had in making motion pictures the art form of this century" in 1972, as part of a renewed appreciation for his work. He continues to be held in high regard, with The Gold Rush, City Lights, Modern Times, and The Great Dictator often ranked on lists of the greatest films of all time.

Stamps from the US, Spain, Monaco and Vatican City depicting Charlie Chaplin

1912 – Harriet Quimby becomes the first woman to fly an airplane across the English Channel.

Harriet Quimby (May 11, 1875 – July 1, 1912) was an early American aviation pioneer and a movie screenwriter.

In 1911, she was awarded a U.S. pilot's certificate by the Aero Club of America, becoming the first woman to gain a pilot's license in the United States. In 1912, she became the first woman to fly across the English Channel. Although Quimby lived only to the age of 37, she influenced the role of women in aviation.

After earning her license, the "Dresden China Aviatrix" or "China Doll," as the press called her because of her petite stature and fair skin, moved to capitalize on her new notoriety. Pilots could earn as much as $1,000 per performance, and prize money for a race could go as high as $10,000 or more. Quimby joined the Moisant International Aviators, an exhibition team, and made her professional debut, earning $1,500, in a night flight over Staten Island before a crowd of almost 20,000 spectators.

As one of the country's few female pilots, she capitalized on her femininity by wearing trousers tucked into high lace boots accentuated by a plum-colored satin blouse, necklace, and antique bracelet. She drew crowds whenever she competed in cross-country meets and races. As part of the exhibition team, she showcased her talents around the United States and even went to Mexico City at the end of 1911 to participate in aviation activities held in honor of the inauguration of President Francisco Madero.

On July 1, 1912, she flew in the Third Annual Boston Aviation Meet at Squantum, Massachusetts. Although she had obtained her ACA certificate to be allowed to participate in ACA events, the Boston meet was an unsanctioned contest. Quimby flew out to Boston Light in Boston Harbor at about 3,000 feet, then returned and circled the airfield.

William A.P. Willard, the organizer of the event and father of the aviator Charles Willard, was a passenger in her brand-new two-seat Bleriot monoplane. At an altitude of 1,000 feet (300 m) the aircraft unexpectedly pitched forward for reasons still unknown. Both Willard and Quimby were ejected from their seats and fell to their deaths, while the plane "glided down and lodged itself in the mud".

US airmail stamp depicting Harriet Quimby

March 31st in stamps Bechuanaland Protectorate, Eiffel Tower, Emil von Behring, Jesse Owens

Here are some events that happened on March 31st. It could be an event or a person that died or was born on that day

1885 – The United Kingdom establishes the Bechuanaland Protectorate.

The Bechuanaland Protectorate was a protectorate established on 31 March 1885, by the United Kingdom of Great Britain and Ireland in Southern Africa. It became the Republic of Botswana on 30 September 1966

The proclamation of a protectorate flanked by a new Crown colony to the south (British Bechuanaland) were primarily intended as safeguards against further expansion by Germany, Portugal, or Boers.

Early stamps issued for use in the Bechuanaland Protectorate

1889 – The Eiffel Tower is officially opened.

Alexandre Gustave Eiffel (15 December 1832 – 27 December 1923) was a French civil engineer. A graduate of École Centrale Paris, he made his name building various bridges for the French railway network, most famously the Garabit viaduct. He is best known for the world-famous Eiffel Tower, built for the 1889 Universal Exposition in Paris, and his contribution to building the Statue of Liberty in New York.

In 1881 Eiffel was contacted by Auguste Bartholdi who was in need of an engineer to help him to realise the Statue of Liberty. Some work had already been carried out by Eugène Viollet-Le-Duc, but he had died in 1879. Eiffel was selected because of his experience with wind stresses. Eiffel devised a structure consisting of a four-legged pylon to support the copper sheeting which made up the body of the statue. The entire statue was erected at the Eiffel works in Paris before being dismantled and shipped to the United States.

After his retirement from engineering, Eiffel focused on research into meteorology and aerodynamics, making significant contributions in both fields.

Stamps depicting Eiffel and the Eiffel tower

1917 Died: Emil von Behring, German physiologist and immunologist, Nobel Prize laureate (b. 1854)

Emil von Behring (Emil Adolf von Behring), born Emil Adolf Behring (15 March 1854 – 31 March 1917), was a German physiologist who received the 1901 Nobel Prize in Physiology or Medicine, the first one awarded in that field, for his discovery of a diphtheria antitoxin. He was widely known as a "saviour of children," as diphtheria used to be a major cause of child death. He was honored with Prussian nobility in 1901, henceforth being known by the surname "von Behring."

In 1895 he became Professor of Hygienics within the Faculty of Medicine at the University of Marburg, a position he would hold for the rest of his life. He and the pharmacologist Hans Horst Meyer had their laboratories in the same building, and Behring stimulated Meyer's interest in the mode of action of tetanus toxin.

Behring won the first Nobel Prize in Physiology or Medicine in 1901 for the development of serum therapies against diphtheria. He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1902.

In 1904 he founded the Behringwerke in Marburg, a company to produce antitoxins and vaccines.

At the International Tuberculosis Congress in 1905 he announced that he had discovered "a substance proceeding from the virus of tuberculosis." This substance, which he designated "T C," plays the important part in the immunizing action of his "bovivaccine", which prevents bovine tuberculosis. He tried unsuccessfully to obtain a protective and therapeutic agents for humans.

Behring died at Marburg, Hessen-Nassau, on 31 March 1917. His name survived in the Dade Behring organisation (now part of the Siemens Healthineers), in CSL Behring, a manufacturer of plasma-derived biotherapies, in Novartis Behring and in the Emil von Behring Prize of the University of Marburg, the highest endowed medicine award in Germany.

His Nobel Prize medal is now kept on display at the International Red Cross and Red Crescent Museum in Geneva.

German stamps depicting Emil von Behring

German stamps depicting Paul Ehrlich and Emil von Behring

1980 Died: Jesse Owens, American sprinter and long jumper (b. 1913)

James Cleveland "Jesse" Owens (September 12, 1913 – March 31, 1980) was an American track and field athlete and four-time gold medalist in the 1936 Olympic Games.

Owens specialized in the sprints and the long jump and was recognized in his lifetime as "perhaps the greatest and most famous athlete in track and field history". He set three world records and tied another, all in less than an hour at the 1935 Big Ten track meet in Ann Arbor, Michigan — a feat that has never been equaled and has been called "the greatest 45 minutes ever in sport".

He achieved international fame at the 1936 Summer Olympics in Berlin, Germany, by winning four gold medals: 100 meters, long jump, 200 meters, and 4 × 100-meter relay. He was the most successful athlete at the Games and, as a black man, was credited with "single-handedly crushing Hitler's myth of Aryan supremacy", although he "wasn't invited to the White House to shake hands with the President, either".

The Jesse Owens Award is USA Track and Field's highest accolade for the year's best track and field athlete. Owens was ranked by ESPN as the sixth greatest North American athlete of the 20th century and the highest-ranked in his sport. In 1999, he was on the six-man short-list for the BBC's Sports Personality of the Century.

US stamps depicting Jesse Owens