Albert Einstein

German-born theoretical physicist and Nobel Prize laureate, Albert Einstein sadly died 18 April 1955. He was born March 14th, 1879 in Ulm, in the Kingdom of Württemberg in the German Empire. He is Often regarded as the father of modern physics and was one of the most prolific intellects in human history, and is best known for developing the theory of general relativity, E = mc2, which was revolutionary in physics. For this achievement he receiv ed the 1921 Nobel Prize in Physics “for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect”. The latter being pivotal in establishing quantum theory within physics. Near the beginning of his career, Einstein thought that Newtonian mechanics was no longer enough to reconcile the laws of classical mechanics with the laws of the electromagnetic field. This led to the development of his special theory of relativity. He realized, however, that the principle of relativity could also be extended to gravitational fields, and with his subsequent theory of gravitation in 1916, he published a paper on the general theory of relativity. He continued to deal with problems of statistical mechanics and quantum theory, which led to his explanations of particle theory and the motion of molecules. He also investigated the thermal properties of light which laid the foundation of the photon theory of light. In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.

He was visiting the United States when Adolf Hitler came to power in 1933, and did not go back to Germany, where he had been a professor at the Berlin Academy of Sciences. He settled in the U.S., becoming a citizen in 1940. On the eve of World War II, he helped alert President Franklin D. Roosevelt that Germany might be developing an atomic weapon, and recommended that the U.S. begin similar research; this eventually led to what would become the Manhattan Project. Einstein was in support of defending the Allied forces, but largely denounced using the new discovery of nuclear fission as a weapon. Later, together with Bertrand Russell, Einstein signed the Russell–Einstein Manifesto, which highlighted the danger of nuclear weapons. Einstein was affiliated with the Institute for Advanced Study in Princeton, New Jersey, until his death in 1955.

During his life Einstein published more than 300 scientific papers along with over 150 non-scientific works. His great intelligence and originality have made the word “Einstein” synonymous with genius. In 1922, Einstein was awarded the 1921 Nobel Prize in Physics, “for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect”. This refers to his 1905 paper on the photoelectric effect, “On a Heuristic Viewpoint Concerning the Production and Transformation of Light”, which was well supported by the experimental evidence of that time. The presentation speech began by mentioning “his theory of relativity which had been the subject of lively debate in philosophical circles and also has astrophysical implications.

Einstein also won many awards for his work, including the he Max Planck medal of the German Physical Society In 1929, for extraordinary achievements in theoretical physics. In 1936, Einstein was also awarded the Franklin Institute’s Franklin Medal for his extensive work on relativity and the photo-electric effect. The International Union of Pure and Applied Physics also named 2005 the “World Year of Physics” in commemoration of the 100th anniversary of the publication of the annus mirabilis papers. The Albert Einstein Science Park is located on the hill Telegrafenberg in Potsdam, Germany. The best known building in the park is the Einstein Tower which has a bronze bust of Einstein at the entrance. The Tower is an astrophysical observatory that was built to perform checks of Einstein’s theory of General Relativity.

The Albert Einstein Memorial in central Washington, D.C. is a monumental bronze statue depicting Einstein seated with manuscript papers in hand. The statue, commissioned in 1979, is located in a grove of trees at the southwest corner of the grounds of the National Academy of Sciences on Constitution Avenue. In 1999 Time magazine named Albert Einstein the Person of the Century, ahead of Mahatma Gandhi and Franklin Roosevelt, among others. In the words of a biographer, “to the scientifically literate and the public at large, Einstein is synonymous with genius”. Also in 1999, an opinion poll of 100 leading physicists ranked Einstein the “greatest physicist ever”. A Gallup poll recorded him as the fourth most admired person of the 20th century in the U.S. In 1990, his name was added to the Walhalla temple for “laudable and distinguished Germans”, which is located east of Regensburg, in Bavaria, Germany. The United States Postal Service also honoured Einstein with a Prominent Americans series (1965–1978) 8¢ postage stamp and In 2008, Einstein was inducted into the New Jersey Hall of Fame.

World Parkinsons Day

World Parkinson’s Day takes place annually on 11 April to mark the birth of English surgeon apothecary, geologist, paleontologist, and political activist James Parkinson FGS who was born 11 April 1755 in Shoreditch, London, England. He was the son of John Parkinson, an apothecary and surgeon practising in Hoxton Square in London. In 1784 Parkinson was approved by the City of London Corporation as a surgeon. On 21 May 1783, he married Mary Dale, with whom he subsequently had eight children; two did not survive past childhood. Soon after he was married, Parkinson succeeded his father in his practice in 1 Hoxton Square.

In addition to his medical practice, Parkinson had an avid interest in geology and palaeontology, as well as the politics of the day. He was also a strong advocate for the under-privileged, and an outspoken critic of the Pitt government. He became involved in a variety of social and revolutionary causes, and some historians think it most likely that he was a strong proponent for the French Revolution. He published nearly twenty political pamphlets in the post-French Revolution period, while Britain was in political chaos. Writing under his own name and his pseudonym “Old Hubert”, he called for radical social reforms and universal suffrage.

Parkinson called for representation of the people in the House of Commons, the institution of annual parliaments, and universal suffrage. He was a member of several secret political societies, including the London Corresponding Society and the Society of Constitutional Information.In 1794 his membership in the organisation led to his being examined under oath before William Pitt and the Privy Council to give evidence about a trumped-up plot to assassinate King George III. He refused to testify regarding his part in the popgun plot, until he was certain he would not be forced to incriminate himself. The plan was to use a poisoned dart fired from a pop-gun to bring the king’s reign to a premature conclusion. No charges were ever brought against Parkinson but several of his friends languished in prison for many months before being acquitted.

Parkinson was also interested in improving the general health and well-being of the population. He wrote several medical doctrines that exposed a similar zeal for the health and welfare of the people that was expressed by his political activism. He was a crusader for legal protection for the mentally ill, as well as their doctors and families. Between 1799 and 1807 Parkinson published several medical works, including a work on gout in 1805. He was also responsible for early writings on ruptured appendix in English medical literature. In 1812 Parkinson also assisted his son with the first described case of appendicitis in English, and the first instance in which perforation was shown to be the cause of death.

.In 1817 he wrote, An Essay on the Shaking Palsy in which he was the first to describe “paralysis agitans”, a condition that would later be renamed Parkinson’s disease by Jean-Martin Charcot. Parkinson was the first person to systematically describe six individuals with symptoms of the disease that bears his name. In his “An Essay on the Shaking Palsy”, he reported on three of his own patients and three persons who he saw in the street. He referred to the disease that would later bear his name as paralysis agitans, or shaking palsy. He distinguished between resting tremors and the tremors with motion. Jean-Martin Charcot coined the term “Parkinson’s disease” some 60 years later. Although Parkinson erroneously predicted that the tremors in these patients were due to lesions in the cervical spinal cord.

Parkinson was also interested in geology, and palaeontology. He began collecting specimens and drawings of fossils in the latter part of the eighteenth century. He took his children and friends on excursions to collect and observe fossil plants and animals. His attempts to learn more about fossil identification and interpretation were frustrated by a lack of available literature in English, and so he took the decision to improve matters by writing his own introduction to the study of fossils.In 1804, he published the first volume of his book Organic Remains of a Former World. A second volume was also published in 1808, and a third in 1811. In 1822 Parkinson published the shorter “Outlines of Oryctology: an Introduction to the Study of Fossil Organic Remains, especially of those found in British Strata”. Parkinson also contributed several papers to William Nicholson’s “A Journal of Natural Philosophy, Chemistry and the Arts”, and in the first, second, and fifth volumes of the “Geological Society’s Transactions”. He also wrote ‘Outlines of Orytology’ in 1822. In 1807, Parkinson accompanied Sir Humphry Davy, Arthur Aikin and George Bellas Greenough and other distinguished gentlemen at the Freemasons’ Tavern in London for the first meeting of the Geological Society of London.Several fossils were also named after him.

Parkinson sadly died on 21 December 1824 after a stroke that interfered with his speech, his houses inLangthorne went to his sons and wife and his apothecary’s shop to his son, John. He was buried at St. Leonard’s Church, Shoreditch. Parkinson’s life is commemorated with a stone tablet inside the church of St Leonard’s, Shoreditch. A blue plaque at 1 Hoxton Square, also marks the site of his home.

Isambard Kingdom Brunel FRS

Best known for building dockyards, the Great Western Railway, steamships, bridges, tunnels and revolutionising public transport and modern engineering, the British mechanical and Civil Engineer Isambard Kingdom Brunel, FRS was born 9 April 1806.When Brunel was eight he was sent to Dr Morrell’s boarding school in Hove, where he learned the classics. His father, was determined that Brunel should have access to the high-quality education he had enjoyed in his youth in France; accordingly, at the age of 14, the younger Brunel was enrolled first at the College of Caen in Normandy, then at Lycée Henri-Quatre in Paris. Sadly his because his Father Marc sent him to expensive schools, he encountered financial problems, however because he was a Prominent engineer the Government intervened on his behalf. When Brunel completed his studies at Henri-Quatre in 1822, he was due to attend the renowned engineering school École Polytechnique, however Brunel studied under the prominent master clockmaker and horologist Abraham-Louis Breguet instead, after he praised Brunel’s potential in letters to his father.In late 1822, having completed his apprenticeship, Brunel returned to England. Brunel worked for several years as an assistant engineer on the hazardous project to create a tunnel under London’s River Thames near Rotherhithe, alongside his Father, who was chief engineer. However cave-ins and severe flooding in 1828 killed a number of Miners a delayed work, with Brunel narrowly escaping death himself.

During the early part of Brunel’s life, the use of railways began to take off as a major means of transport for goods. This influenced Brunel’s involvement in railway engineering, including railway bridge engineering. In 1833, before the Thames Tunnel was complete, Brunel was appointed chief engineer of the Great Western Railway, one of the wonders of Victorian Britain, running from London to Bristol and later Exeter. The company was founded at a public meeting in Bristol in 1833, and was incorporated by Act of Parliament in 1835. It was Brunel’s vision that passengers would be able to purchase one ticket at London Paddington and travel from London to New York, changing from the Great Western Railway to the Great Western steamship at the terminus in Neyland, South Wales. He surveyed the entire length of the route between London and Bristol himself, with the help of many including his Solicitor Jeremiah Osborne of Bristol Law Firm Osborne Clarke who one occasion rowed Isambard Kingdom Brunel down the River Avon himself to survey the bank of the river for the route. Brunel decided to use a broad gauge of 7 ft 1⁄4 in (2,140 mm) for the track, despite almost all other railways using standard Gauge, because he believed Broad Gauge would offer superior running at high speeds; he also proved through both calculation and a series of trials that his broader gauge was the optimum size for providing both higher speeds and a stable and comfortable ride to passengers, with the wider gauge allowing for larger carriages and thus greater freight capacity.

Drawing on Brunel’s experience with the Thames Tunnel, the Great Western designed many architectural feats of engineering including soaring viaducts such as the one in Ivybridge, specially designed stations, and vast tunnels including the Box Tunnel, which was the longest railway tunnel in the world at that time. Brunel also ordered many Locomotives to his own specification including “North Star” and 20-year-old Daniel Gooch (later Sir Daniel) was appointed as Superintendent of Locomotive Engines. Brunel and Gooch chose to locate their locomotive works at the village of Swindon.

Brunel also designed many bridges including the Clifton Suspension Bridge in Bristol, which spans over 700 ft (210 m), and nominally 200 ft (61 m) above the River Avon. Brunel submitted his designs to a committee headed by Thomas Telford, who rejected all entries, in favour of his own design, however the Public voted in favour of Brunel’s design. Brunel also designed the Maidenhead Railway Bridge. Work also started on the Clifton suspension bridge in 1831, but was suspended due to the Queen Square Riots, However Thanks to colleagues at the Institute of Civil Engineers Work recommenced in 1862 and was completed in 1864, five years after Brunel’s death. The Clifton Suspension Bridge still stands today and over 4 million vehicles traverse it every year.

Brunel also designed the Royal Albert Bridge spanning the River Tamar at Saltash near Plymouth, Somerset Bridge (an unusual laminated timber-framed bridge near Bridgwater, the Windsor Railway Bridge. The Maidenhead Railway Bridge over the Thames in Berkshire is still carrying main line trains to the west, even though today’s trains are about ten times heavier than in Brunel’s time.In 1845 Hungerford Bridge, a suspension footbridge across the Thames near Charing Cross Station in London, was opened. It was replaced by a new railway bridge in 1859, and the suspension chains were used to complete the Clifton Suspension Bridge. Brunel also designed the Royal Albert Bridge in 1855 for the Cornwall Railway, this consists of two main spans of 455 ft (139 m), 100 ft (30 m) above mean high spring tide, plus 17 much shorter approach spans. Opened by Prince Albert on 2 May 1859, it was completed in the year of Brunel’s death.


Brunel’s achievements inspired and ignited the imagination of many technically minded Britons. However After Brunel’s death standard gauge was adopted by all railways in the country. Despite the Great Western’s claim of proof that its broad gauge was the better the decision was made to use Stephenson’s standard gauge, mainly because this had already covered a far greater amount of the country. However, by May 1892 when the broad gauge was abolished the Great Western had already been re-laid as dual gauge (both broad and standard). There is also a larger than life bronze statue of him at Neyland holding a steamship in one hand and a locomotive in the othe

another of Brunel’s interesting use of technical innovations was the atmospheric railway, the extension of the Great Western Railway (GWR) southward from Exeter towards Plymouth, technically the South Devon Railway (SDR), though supported by the GWR. Instead of using locomotives, the trains were moved by Clegg and Samuda’s patented system of atmospheric (vacuum) traction, whereby stationary pumps sucked air from a pipe placed in the centre of the track.The section from Exeter to Newton (now Newton Abbot) was completed on this principle, and trains ran at approximately 68 miles per hour (109 km/h). Pumping stations with distinctive square chimneys were sited at two-mile intervals. Fifteen-inch (381 mm) pipes were used on the level portions, and 22-inch (559 mm) pipes were intended for the steeper gradients.The technology required the use of leather flaps to seal the vacuum pipes. The natural oils were drawn out of the leather by the vacuum, making the leather vulnerable to water, rotting it and breaking the fibres when it froze. It had to be kept supple with tallow, which is attractive to rats. The flaps were eaten, and vacuum operation lasted less than a year, from 1847 (experimental service began in September; operations from February 1848) to 10 September 1849. A number of South Devon Railway engine houses still stand, including that at Totnes (scheduled as a grade II listed monument in 2007 to prevent its imminent demolition, even as Brunel’s bicentenary celebrations were continuing) and at Starcross, on the estuary of the River Exe, which is a striking landmark, and a reminder of the atmospheric railway, also commemorated as the name of the village pub.

In 1835, before the Great Western Railway had opened, Brunel proposed extending its transport network by boat from Bristol across the Atlantic Ocean to New York City. The Great Western Steamship Company was formed by Thomas Guppy for that purpose. It was widely disputed whether it would be commercially viable for a ship powered purely by steam to make such long journeys. Technological developments in the early 1830s—including the invention of the surface condenser, which allowed boilers to run on salt water without stopping to be cleaned—made longer journeys more possible, but it was generally thought that a ship would not be able to carry enough fuel for the trip and have room for a commercial cargo. Brunel formulated the theory that the amount a ship could carry increased as the cube of its dimensions, whereas the amount of resistance a ship experienced from the water as it travelled only increased by a square of its dimensions. This would mean that moving a larger ship would take proportionately less fuel than a smaller ship.

To test this theory, Brunel offered his services for free to the Great Western Steamship Company, which appointed him to its building committee and entrusted him with designing its first ship, the Great Western.When it was built, the Great Western was the longest ship in the world at 236 ft (72 m) with a 250-foot (76 m) keel. The ship was constructed mainly from wood, but Brunel added bolts and iron diagonal reinforcements to maintain the keel’s strength. In addition to its steam-powered paddle wheels, the ship carried four masts for sails. The Great Western embarked on her maiden voyage from Avonmouth, Bristol, to New York on 8 April 1838 with 600 long tons (610,000 kg) of coal, cargo and seven passengers on board. Brunel himself missed this initial crossing, having been injured during a fire aboard the ship as she was returning from fitting out in London.

As the fire delayed the launch several days, the Great Western missed its opportunity to claim title as the first ship to cross the Atlantic under steam power alone. Even with a four-day head start, the competing Sirius arrived only one day earlier and its crew was forced to burn cabin furniture, spare yards and one mast for fuel. In contrast, the Great Western crossing of the Atlantic took 15 days and five hours, and the ship arrived at her destination with a third of its coal still remaining, demonstrating that Brunel’s calculations were correct. The Great Western had proved the viability of commercial transatlantic steamship service, which led the Great Western Steamboat Company to use her in regular service between Bristol and New York from 1838 to 1846. She made 64 crossings, and was the first ship to hold the Blue Riband with a crossing time of 13 days westbound and 12 days 6 hours eastbound. The service was commercially successful enough for a sister ship to be required, which Brunel was asked to design.

Brunel had become convinced of the superiority of propeller-driven ships over paddle wheels. After tests conducted aboard the propeller-driven steam tug Archimedes, he incorporated a large six-bladed propeller into his design for the 322-foot (98 m) Great Britain, which was launched in 1843.Great Britain is considered the first modern ship, being built of metal rather than wood, powered by an engine rather than wind or oars, and driven by propeller rather than paddle wheel. She was the first iron-hulled, propeller-driven ship to cross the Atlantic Ocean.Her maiden voyage was made in August and September 1845, from Liverpool to New York. In 1846, she was run aground at Dundrum, County Down. She was salvaged and employed in the Australian service.And today she is fully preserved and open to the public in Bristol, UK.

In 1852 Brunel began designing a third ship, larger than her predecessors, intended for voyages to India and Australia. Named The Great Eastern and built at John Scott Russell’s Napier Yard in London, she was cutting-edge technology for her time: almost 700 ft (210 m) long, fitted out with the most luxurious appointments, and capable of carrying over 4,000 passengers. Great Eastern was designed to cruise non-stop from London to Sydney and back (since engineers of the time misunderstood that Australia had no coal reserves), and she remained the largest ship built until the start of the 20th century. Like many of Brunel’s ambitious projects, the ship soon ran over budget and behind schedule in the face of a series of technical problems. Also because Brunel’s engineering innovations were so revolutionary and ahead of their time, the prevailing economic and industrial conditions meant It was several decades before transoceanic steamship travel emerged as a viable industry. Great Eastern set forth on her maiden voyage from Southampton to New York on 17 June 1860. Under Captain Sir James Anderson, the Great Eastern was also deployed as an oceanic telegraph cable-layer playing a significant role in laying the first lasting transatlantic telegraph cable, which enabled telecommunication between Europe and North America.

Brunel became A celebrated engineer in his era and numerous monuments were dedicated to Brunel in London at Temple, Brunel University, Paddington station, Bristol, Plymouth, Swindon, Milford Haven and Saltash. The topmast of the Great Eastern is also used as a flagpole at the entrance to Anfield, Liverpool Football Club’s ground.Contemporary locations bear Brunel’s name, such as Brunel University in London, a shopping centre in Bletchley, Milton Keynes, and a collection of streets in Exeter: Isambard Terrace, Kingdom Mews, and Brunel Close. A road, car park, and school in his home city of Portsmouth are also named in his honour, along with one of the city’s largest public houses There is an engineering lab building at the University of Plymouth named in his honour.

In a 2002 BBC television poll Of the “100 Greatest Britons”, Brunel came second, behind Winston Churchill. Brunel’s life and works have been depicted in numerous books, films and television programs. Perhaps the most recent is the 2003 book and BBC TV series, Seven Wonders of the Industrial World, which included a dramatisation of the building of the Great Eastern. Many of Brunel’s bridges are also still in use, having stood the test of time. Brunel’s first engineering project, the Thames Tunnel, is now part of the London Overground network. The Brunel Engine House at Rotherhithe, which once housed the steam engines that powered the tunnel pumps, now houses the Brunel Museum dedicated to the work and lives of Marc and Isambard Kingdom Brunel. Many of Brunel’s original papers and designs are now held in the Brunel Institute alongside the SS Great Britain in Bristol, and are freely available for researchers.

Hedwig Kohn

German-American physicist Hedwig Kohn was born 5 April 1887 in Breslau (now Wrocław, Poland), Kohn was the daughter of Georg Kohn, a wholesale merchant of fine cloth, and Helene Hancke, a member of a well-to-do family. Her parents were both German Jews. In 1907, Kohn became the second woman to enter the physics department of Breslau University (Universität Breslau, now University of Wrocław). She obtained her doctorate in physics under Otto Lummer in 1913 and was soon appointed as Lummer’s assistant and was trained by Otto Lummer in the quantitative determination of the intensity of light, both from broad-band sources, such as a “black body”, and from the discrete emission lines of atoms and molecules. She stayed at the university’s Physics Institute during World War I and obtained her habilitation (the qualification for university teaching) in physics in 1930 becoming one of only three women to do so. Sadly Kohn was dismissed from her position in 1933 due to Nazi regulations which barred Jews from government service She survived by fulfilling contracts for applied research in the illumination industry until 1938, when she found herself without work or financial resources whereupon she was eventually forced to leave Germany during the Nazi regime.

She had been given a visa to the United Kingdom in 1939, but it was cancelled because of World War II; she eventually secured a visa to travel to Sweden and immediately went there in July 1940, then On receiving a visa from the United States, she moved there.

When Kohn arrived in the United States in January of 1941, she was significantly unwell. After recovering, Kohn taught at the Women’s College of the University of North Carolina at Greensboro for a year and a half The journey to her first position at the Women’s College of the University of North Carolina in Greensboro took Kohn through Berlin, Stockholm, Leningrad, Moscow, Vladivostok, Yokohama, San Francisco, and Chicago. She was then Offered temporary positions at three women’s colleges in the United States through the aid of Rudolf Ladenburg, Lise Meitner, Hertha Sponer, the American Association of University Women (AAUW), and many others. In 1942, she began teaching at Wellesley College in Massachusetts where Kohn established a research laboratory for flame spectroscopy.

Hedwig Kohn retired as a Professor in 1952 and Upon Kohn’s retirement, Hertha Sponer, then professor of physics at Duke University in Durham, North Carolina, offered her a position as a research associate. Kohn set up a laboratory at Duke University and resumed research, where she guided two graduate students to their doctorates and recruited two post-doctoral fellows to assist in her study of flame spectroscopy. She wrote 270 pages in the leading physics text of the 1930s and 1940s in Germany, received one patent, and wrote numerous articles in scientific journals, some of which were still being cited into the 2000s.Two of her students became professors in Germany. She worked at Duke University until very shortly before her death on 26 November 1964.

Hedwig will be forever remembered for her work in flame spectroscopy and the quantitative determination of the intensity of light, both from broad-band sources, such as a “black body”, and from the discrete emission lines of atoms and molecules, and for developing methods and devising ways of extracting information from intensity measurements and from emission line shapes.

Samuel Morse

Samuel Morse The American contributor to the invention of a single-wire telegraph system and co-inventor of Morse code, sadly passed away on 2 April 1872 aged 80, and is buried in the Green-Wood Cemetery in Brooklyn, New York.

Morse was born 27th April in 1791 in Charlestown Massachusetts. He attended the Phillips Academy in Andover, Massachusetts, after which he went on to Yale College where he studied religious philosophy, mathematics and science of horses. While at Yale, he also attended lectures on electricity from Benjamin Silliman and Jeremiah Day, and In 1810, he graduated from Yale with Phi Beta Kappa honours.

Samuel Morse was also an accomplished painter and whilst at Yale He supported himself financially by painting. He expressed some of his beliefs in his painting “Landing of the Pilgrims”, through the depiction of simple clothing as well as the people’s austere facial features. His image captured the psychology of the Federalists; Calvinists from England brought to North America ideas of religion and government, thus linking the two countries. This work also attracted the attention of the notable artist Washington Allston. Later Morse accompanied Allstone on a three-year painting study in England, where he worked to perfect his painting techniques under Allston’s watchful eye. By the end of 1811, he gained admittance to the Royal Academy. He liked the Neo-classical art of the Renaissance particularly the works of Michelangelo and Raphael. After observing and practicing life drawing and absorbing its anatomical demands, the young artist produced his masterpiece, the Dying Hercules. Morse eventually left England on August 21, 1815, to return to the United States and begin his full-time career as a painter.

Between 1815–1825 Morse painted America’s culture and life, including the Federalist former President John Adams, hoping to become part of grander projects as the The Federalists and Anti-Federalists clashed over Dartmouth College. Morse painted portraits of Francis Brown — the college’s president — and Judge Woodward, who was involved in bringing the Dartmouth case before the U.S. Supreme Court. Morse moved to New Haven and was commissioned to paint the Hall of Congress and a portrait of the Marquis de Lafayette, who was a leading French supporter of the American Revolution. From 1830 to 1832, Morse traveled and studied in Europe to improve his painting skills, visiting Italy, Switzerland and France, Some of Morse’s paintings and sculptures are on display at his Locust Grove estate in Poughkeepsie, New York. During his time in Paris, he developed a friendship with the writer James Fennimore Cooper, and On a subsequent visit he also met Louis Daguerre and became interested in the latter’s daguerreotype — the first practical means of photography. In 1825, the city of New York Morse was commissioned to paint a portrait of Gilbert du Motier, marquis de Lafayette, in Washington. Whilst Morse was painting, he received a letter from his father that read one line, “Your dear wife is convalescent”. Morse immediately left Washington for his home at New Haven, leaving the portrait of Lafayette unfinished. Sadly By the time he arrived, his wife had already been buried.

Heartbroken in the knowledge that for days he was unaware of his wife’s failing health and her lonely death, this encouraged Morse to pursue a means of rapid long distance communication. On the sea voyage home in 1832, Morse encountered Charles Thomas Jackson of Boston, a man who was well schooled in electromagnetism. Witnessing various experiments with Jackson’s electromagnet, Morse developed the concept of a single-wire telegraph. However Morse encountered the problem of getting a telegraphic signal to carry over more than a few hundred yards of wire. His breakthrough came from the insights of Professor Leonard Gale, With Gale’s help, Morse introduced extra circuits or relays at frequent intervals and was soon able to send a message a distance of ten miles (16 km) of wire. Morse and Gale were soon joined by a young enthusiastic man, Alfred Vail, who had excellent skills, insights and money. At the Speedwell Ironworks in Morristown, New Jersey, Morse and Vail made the first public demonstration of the electric telegraph on January 11, 1838. and Today The original Morse telegraph, submitted with his patent application, is part of the collections of the National Museum of American History at the Smithsonian Institution

Morse’s valuable contributions to science and technology has enabled many people to communicate long-distance and saved countless lives. Even today Morse code is still the primary language of telegraphy and is still the standard for rhythmic transmission of data.

Bunsen Burner Day

Bunsen Burner Day commemorate the anniversary of the birth of German chemist Robert Wilhelm Eberhard Bunsen who was born 30 March 1811. After attending school in Holzminden, Bunsen matriculated at Göttingen in 1828 and studied chemistry with Friedrich Stromeyer as well as mineralogy with Johann Friedrich Ludwig Hausmann and mathematics with Carl Friedrich Gaus After obtaining a PhD in 1831, Bunsen spent 1832 and 1833 traveling in Germany, France, and Austria; and net many scientists along the way including Friedlieb Runge (who discovered aniline and in 1819 isolated caffeine), Justus von Liebig in Giessen, and Eilhard Mitscherlich in Bonn

In 1833 Bunsen became a lecturer at Göttingen and began experimental studies of the (in)solubility of metal salts of arsenous acid. His discovery of the use of iron oxide hydrate as a precipitating agent is still today the most effective antidote against arsenic poisoning. This interdisciplinary research was carried on and published in conjunction with the physician Arnold Adolph Berthold. In 1836, Bunsen succeeded Friedrich Wöhler at the Polytechnic School of Kassel (German: Baugewerkschule Kassel). Bunsen taught there for three years, and then accepted an associate professorship at the University of Marburg, where he continued his studies on cacodyl derivatives. He was promoted to full professorship in 1841. While at University of Marburg, Bunsen participated in the 1846 expedition for the investigation of Iceland’s volcanoes.

Bunsen’s work brought him quick and wide acclaim, partly because cacodyl, which is extremely toxic and undergoes spontaneous combustion in dry air, is so difficult to work with. Bunsen almost died from arsenic poisoning, and an explosion with cacodyl cost him sight in his right eye. In 1841, Bunsen created the Bunsen cell battery, using a carbon electrode instead of the expensive platinum electrode used in William Robert Grove’s electrochemical cell. Early in 1851 he accepted a professorship at the University of Breslau.

In late 1852 Bunsen became the successor of Leopold Gmelin at the University of Heidelberg. There he used electrolysis to produce pure metals, such as chromium, magnesium, aluminum, manganese, sodium, barium, calcium and lithium. A long collaboration with Henry Enfield Roscoe began in 1852, in which they studied the photochemical formation of hydrogen chloride (HCl) from hydrogen and chlorine. From this work, the reciprocity law of Bunsen and Roscoe originated. He discontinued his work with Roscoe in 1859 and joined Gustav Kirchhoff to study emission spectra of heated elements, a research area called spectrum analysis. For this work, Bunsen and his laboratory assistant, Peter Desaga, had perfected a special gas burner by 1855, which was influenced by earlier models. The newer design of Bunsen and Desaga, which provided a very hot and clean flame, is now called simply the “Bunsen burner”, a common laboratory equipment.

In 1859, Kirchhoff suggested that Bunsen should try to form prismatic spectra of the colors of heated elements colors. So Kirchhoff and Bunsen created a prototype spectroscope. Using it, they were able to identify the characteristic spectra of sodium, lithium, and potassium. Bunsen proved that highly pure samples gave unique spectra. Using this method he also detected previously unknown new blue spectral emission lines in samples of mineral water from Dürkheim. This indicated the existence of an undiscovered chemical element which he named “caesium”, after the Latin word for deep blue. The following year he also discovered rubidium, by a similar process. In 1860, Bunsen was elected a foreign member of the Royal Swedish Academy of Sciences for his Pioneering work in the field of Photochemistry organoarsenic chemistry and Scientific Research. The Bunsen–Kirchhoff Award for spectroscopy is also named after Bunsen and Kirchhoff.

Vernal Equinox/Earth Equinox Day

The March equinox or Northward equinox is the equinox on the Earth when the subsolar point appears to leave the southern hemisphere and cross the celestial equator, heading northward as seen from Earth. In the Northern Hemisphere the March equinox is known as the vernal equinox, and in the Southern Hemisphere as the autumnal equinox. On the Gregorian calendar the Northward equinox can occur as early as 19 March or as late as 21 March. For a common year the computed time slippage is about 5 hours 49 minutes later than the previous year, and for a leap year about 18 hours 11 minutes earlier than the previous year. Balancing the increases of the common years against the losses of the leap years keeps the calendar date of the March equinox from drifting more than one day from 20 March each year. The March equinox may be taken to mark the beginning of spring and the end of winter in the Northern Hemisphere but marks the beginning of autumn and the end of summer in the Southern Hemisphere.

The March equinox is one point in time commonly used to determine the length of the tropical year. The mean tropical year is the average of all the tropical years measured from every point along the Earth’s orbit. When tropical year measurements from several successive years are compared, many slight variations are found which are due to a variety of phenomenon, including nutation and the planetary perturbations from the Sun. the mean Tropical year lasts 365 days, 5 hours, 48 minutes, 45 seconds.

The point where the Sun crosses the celestial equator northwards is called the First Point of Aries. However, due to the precession of the equinoxes, this point is no longer in the constellation Aries, but rather in Pisces. By the year 2600 it will be in Aquarius. The Earth’s axis causes the First Point of Aries to travel westwards across the sky at a rate of roughly one degree every 72 years. Based on the modern constellation boundaries, the northward equinox passed from Taurus into Aries in the year −1865 (1866 BC), passed into Pisces in the year −67 (68 BC), will pass into Aquarius in the year 2597, and will pass into Capricornus in the year 4312. It passed by (but not into) a ‘corner’ of Cetus at 0°10′ distance in the year 1489. On the day of an equinox, the Sun’s disk crosses the Earth’s horizon directly to the east at dawn—rising; and again, some 12 hours later, directly to the west at dusk—setting. The March equinox, like all equinoxes, is characterized by having an almost exactly equal amount of daylight and night across most latitudes on Earth.

Due to refraction of light rays in the Earth’s atmosphere the Sun is visible above the horizon even when its disc is completely below the limb of the Earth. Additionally, when seen from the Earth, the Sun is a bright disc in the sky and not just a point of light, thus sunrise and sunset can be said to start several minutes before the sun’s geometric center even crosses the horizon, and extends equally long after. These conditions produce differentials of actual durations of light and darkness at various locations on Earth during an equinox. This is most notable at the more extreme latitudes, where the Sun may be seen to travel sideways considerably during the dawn and evening, drawing out the transition from day to night. At the north or south poles, the Sun appears to move steadily around the horizon, and just above the horizon, neither rising nor setting apart from a slight change in declination of about 0.39° per day as the equinox passes.