1886

1886

in Tags

Friedrich Nietzsche published “Beyond Good and Evil,” in which he contrasted aristocratic morality, which values courage and greed, with slave morality, which values humility, compassion, and benevolence.

1886

1886

in Tags

Ohio, United States. Charles Hall, while studying at Oberlin College, passes a current through a solution containing aluminum, releasing the precious metal, which precipitates to the bottom in the form of flakes. Hall is only 23 years old and has found a sort of philosopher’s stone, as aluminum is worth more than gold at the time. But his fortune won’t be immediate. In 1887, the Austrian Carl-Joseph Bayer will invent a similar process, and Hall, spurred by competition, will found in Pittsburgh what will become the Aluminum Company of America (Alcoa), one of the most profitable companies in history. Aluminum production will increase from 22 kg/day in 1888 to 40 tons/day in 1908, and the price will plummet from $550/pound to $18 on the Chicago Stock Exchange, eventually falling to $0.25/pound. Hall will become frighteningly rich, and Aluminum will become a terribly common metal, so much so that it will become disposable…

1886

1886

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Clemens Winkler of the Freiberg Mining University between Saxony and Bohemia isolates the semiconductor germanium, which fills the gap between silicon and tin in Mendeleev’s table. A few years earlier, Lars Nilson of Uppsala University discovers scandium, thus filling the gap between calcium and titanium in Mendeleev’s table.

1886

1886

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Druggist John Pomberton sells the first glass of Coca-Cola at Jacobs’ Pharmacy in downtown Atlanta. He serves nine drinks a day for his first year. John Styth Pemberton’s original recipe for Coca-Cola is said to have included coca leaves.

1885

1885

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Germany. Gottfried Daimler invents the motorcycle. He calls it the Petroleum Reitwagen. Nikolaus Otto built the first gasoline engine in 1866. But it wasn’t until World War I, and its military use, that the internal combustion engine truly took off. 50 years after Otto.

1885

1885

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Carl Auer patented a gas light with a jacket made of magnesium, lanthanum, and yttrium oxides. Its greenish light, however, did not make it popular.

1885

1885

in Tags

The discovery of Neodymium by Carl Auer, a century later, paved the way for applications in high-performance brushless motors, as a component (NdFeB) of permanent magnets on the rotor.

1885

1885

in Tags

The European powers agree to cede control of 2.3 million square kilometers of Africa to King Leopold II of Belgium: the Congo Free State is born. The true goal is obviously profit. The rubber industry flourishes, and rubber plantations multiply in Central Africa. Six million Africans lose their lives to massacres perpetrated by the Belgians and to the harsh working conditions between 1885 and 1908.

1885

1885

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Carl Auer’s Annus mirabilis. He separates the supposed chemical element didymium into two real chemical elements: praseodymium and neodymium.

August 18, 1885

August 18, 1885

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Thomas Alva Edison goes on a trip to upstate New York and New Hampshire with 19-year-old Mina Miller and four other companions. Mina will become Thomas Edison’s wife there the following year.

1885

1885

in Tags

The Maxim machine gun is the first functioning portable automatic weapon. It owes its name to American inventor Hiram Maxim, who invented it in 1885. The first portable automatic weapon (which in its first version required 4-6 men to operate) demonstrated in initial tests a maximum fire capacity of 500 rounds per minute, making it a devastating weapon. Unlike other models like the Gatling gun, it used recoil to eject the spent cartridge and chamber a new one, rather than requiring a man to operate the crank mechanism. The weapon was adopted by the British Army in 1889 and had its baptism of fire in 1894 in the Matabele War, a Zulu rebel tribe. In one battle, 50 men managed to route 5,000 warriors with just four Maxims. It was quickly adopted by nearly all European military forces and contributed to the rapid colonization of Africa at the end of the 19th century. On the Western Front of World War I it was estimated that 90% of bullet wounds were inflicted by Maxim-type machine guns.

1885

1885

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In 1885, the United States placed a 3-kg pyramid of the precious metal (aluminum) on the obelisk dedicated to Washington, D.C., to demonstrate the nation’s wealth (it would be worth a few euros today). The value of 3 kg of aluminum at the time would have paid for three months’ wages for all the workers who worked on the obelisk. It had been synthesized for the first time in 1825, separating it from alum, and was classified as a precious metal, on a par with gold, platinum, and silver. Napoleon III reserved aluminum cutlery for his most illustrious guests, and gold and silver for others.

1885

1885

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Professor Galileo Ferraris of the University of Turin describes a method for producing a rotating magnetic field. Nikola Tesla had, unknowingly, already described it in 1882 and produced the various apparatus needed to test its operation.

June 18, 1885

June 18, 1885

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Neodymium is discovered by Baron Carl Auer von Welsbach. The discovery occurred after an attempt to separate the components of didymium, which turned out to be neodymium (a new twin) and praseodymium. A century later, neodymium would be the main component of the most powerful rare-earth magnets used in servo motors. The discovery of neodymium (1885) and samarium (1879) represents the discovery of two of the main rare earth elements (which are not that rare after all…) that are today fundamental elements for electric servo motors and for electronics in general (for example, lasers).

May 1885

May 1885

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Arizona, United States. Geronimo and other Chirikawa Apache warriors escape the reservation one last time. They are pursued into Mexico by 5,000 federal soldiers.

1884

1884

in Tags

Thomas Alva Edison’s Hannus horribilis, despite his hyperactivity in patenting and more: his financial follies, the brink of bankruptcy, the humiliating sale of his house (in reality bought back by a trusted front man), the sudden loss of his young wife and mother of his children.

1884

1884

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In 1884, Nikola Tesla arrived in the United States and began working briefly for Thomas Edison. This marked the beginning of a complex relationship between the two inventors, characterized by collaboration, conflict, and, ultimately, a rivalry known as the “War of the Currents.” Edison took up the suggestion of his collaborator Charles Batchelor, who had met Tesla the previous year in Paris and was impressed by his understanding of electricity as well as his voracious appetite for steak. On both counts, America would certainly be the most suitable place for Nikola Tesla. Edison would later comment: “This is a damn good guy!”

October 21, 1884

October 21, 1884

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Thomas Alva Edison is awarded US Patent 307031 for the thermionic emission indicator (Edison Effect). Edison did not develop it further, but it was the first vacuum tube that would launch the electronics industry.

August 9, 1884

August 9, 1884

in Tags

Mary Stilwell, wife of Thomas Alva Edison, died at the young age of 29, of unknown causes. They married on December 25, 1871, when she was only 16, and had known each other for only two months. They had three children: Marion Estelle, Thomas Alva Jr., and William Leslie. It is possible that Mary died of a drug overdose or a brain tumor. Doctors of the time frequently prescribed morphine and other opiates to treat a wide variety of ailments. Edison remarried on February 24, 1886, to 20-year-old Mina Miller, daughter of inventor Lewis Miller, and they had three more children: Madeleine, Charles, and Theodore. Mina died on August 24, 1947, following her husband.

June 6, 1884

June 6, 1884

in Tags

Nikola Tesla arrives in New York and is accepted by the Immigration Office in Manhattan, although the government employee evidently has difficulty understanding his nervous interlocutor, who is then registered as a native Swede (he had probably said “Smiljan,” not “Sweden”). Tesla is initially astonished by the crudeness and vulgarity of American speech. With Edison’s company in New York, Tesla works on dynamos (DC), but continues to envision three-phase motors (AC).

late March 1884

late March 1884

in Tags

From a yacht in St. Augustine, Thomas Alva Edison managed to kill a 700-pound shark with an electrified fishing line. The shark was fatally electrocuted, and was then loaded aboard to be placed on permanent display at the local Vedder Museum.

1884

1884

in Tags

Alexandria. German bacteriologist Robert Koch discovers Vibrio cholerae. The previous year, Vibrio cholerae had killed his French rival, physician Louis Thuillier.

1884

1884

in Tags

Nikola Tesla first worked for Thomas Edison and then formed his own company, the Tesla Electric Light Company, where he patented the Tesla Arc Lamp. He was then forced to leave the company and found himself unemployed for a long time, during which he suffered a terrible depression, which he would define as the worst period of his life.

1884

1884

in Tags

Edwin Abbot in London writes “Flatland: A Romance of Many Dimensions by a Square.” He treats extra-ecclidian spaces in a popular and fictional way.

1883

1883

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Berlin, Germany. The AEG (Allgemeine Elektricitäts-Gesellschaft) is founded, which, like Bell Labs in New York, sees a fruitful collaboration between basic and applied research. Its original name was actually the Deutsche Edison-Gesellschaft für angewandte Elektricität, and after World War II it moved to Frankfurt am Main.

1883

1883

in Tags

The United States and Canada are the first nations to adopt modern time: Capital Meridian Time

May 24, 1883

May 24, 1883

in Tags

The Brooklyn Bridge opens. Designed by engineer John Roebling, the Brooklyn Bridge is one of the most recognizable symbols of the United States. Made entirely of steel, it connects the island of Manhattan to the borough of Brooklyn, otherwise separated by the East River. Begun in 1867, the construction of this bridge employed approximately 600 workers: 20 lost their lives, and John Roebling’s son, Washington Roebling, suffered from an air embolism. Washington had succeeded his father as project leader when his father died of tetanus. His toes had been amputated following a ferry accident at the docks, and he refused further treatment, instead relying on “water therapy” (continuous water baths on the wound); he died 24 days after the accident. The Brooklyn Bridge is made up of 4 steel cables (each composed of 5657 km of steel wire combined with zinc) and originally had a 5-lane structure, today it has 6, three for traffic towards Manhattan and three for traffic towards Brooklyn.

1883

1883

in Tags

Mark Twain publishes “Mississippi Tales,” the first work he ever typed for his publisher. Twain dictated it to his secretary, who used a Remington typewriter. Twain was the most famous person in America at the time.

1883 – 1885

1883 – 1885

in Tags

Friedrich Nietzsche wrote Thus Spoke Zarathustra, written in oracular language. The work contains some fundamental ideas: the concept of supermen who will replace men, the transvaluation of values, and finally the eternal return of the same (everything that has happened once is destined to happen again forever in the eternity of time).

1883

1883

in Tags

Grocer-pharmacist John Pomberton invents Coca-Cola in Atlanta. On May 8, 1886, he sells the first glass of Coca-Cola at Jacobs’ Pharmacy in downtown Atlanta. He serves nine drinks a day for the first year.

1882

1882

in Tags

The British invade and occupy Egypt, losing only 57 soldiers in the decisive Battle of Tell al-Kebir. This soon prompts other European powers to embark on colonial adventures in Africa.

1882

1882

in Tags

The first blow of the pickaxe to demolish the city walls of Modena; the demolition work will be completed before the 1920s.

September 1882

September 1882

in Tags

The Great September Comet passes by, reaching magnitude -17 (that’s a lot: the logarithmic scale is inverted, and 0 is Sirius, the brightest star in the Northern Hemisphere). It’s visible even in broad daylight near the Sun. It’s the oldest comet, of which a photograph still exists.

September 1882

September 1882

in Tags

Manhattan, New York. With the flick of a switch, Thomas Alva Edison transformed Lower Manhattan’s First District from a dimly lit gaslight hive to a blaze of dazzling jewels.

August 26, 1882

August 26, 1882

in Tags

Scientific American magazine publishes a detailed description of Edison’s Electric Lighting System. The revolution is so subtle that very few people notice what’s happening: the end of the contrast between night and day that has endured throughout human history.

Spring 1882

Spring 1882

in Tags

The surface of the sea off the East Coast of the United States, stretching for approximately 480 kilometers, is covered with the bodies of approximately 1.4 billion fish. The die-off is believed to have been caused by an incursion of cold water during a storm.

March 23, 1882

March 23, 1882

in Tags

Amalia Emmy Noether, author of the famous Noether Theorem, was born in Erlangen: CNS for the existence of a continuous symmetry is the existence of a conserved quantity (i.e., an invariant).

1882

1882

in Tags

Nikola Tesla developed the concept behind the three-phase asynchronous motor, eliminating the need for a DC motor’s commutator. This concept involves a rotating three-phase electromagnetic field.

1882

1882

in Tags

Thomas Edison and one of his engineers, William Hammer, discovered the Edison effect: the appearance of an electric current between a heated cathode and an anode in a vacuum tube; the phenomenon was not further explored.

1882

1882

in Tags

Thomas Edison opens the first commercial electrical plant in New York, with 85 paying customers for a total of 400 lamps.

1882

1882

in Tags

Budapest. Nikola, while working and visiting Ganz & Co., notices a non-functioning ring transformer on the ground in the warehouse. It’s broken because it’s caused by incorrectly wound copper wire. Tesla turns it on and places an iron ball on the wooden disk that covers the cylindrical transformer. To his great satisfaction, the iron ball begins to rotate. He deduces that the transformer, broken due to incorrect windings, generates two electromagnetic fields, which create a rotating field. The tests end abruptly when Nikola Tesla and his friend Szigeti are finally called by Tivadar Puskas to work for Edison in Paris. Once in the French capital, Tesla explains to Edison’s executives his idea for a rotating field, this time created by three phases instead of two (to ensure the direction of rotation). But to his disappointment, Edison’s people are not at all impressed by the idea.

December 27, 1881

December 27, 1881

in Tags

Thomas Alva Edison was granted US Patent 251,545 for his electrolytic meter, which measured electricity without a coil and requiring no power supply. It allowed those wishing to tax electricity to measure it reliably and inexpensively, thus opening up enormous commercial prospects. Thomas Alva Edison accumulated 80 patents in 1880, 90 in 1881, and 100 in 1882. Edison was enjoying a period of exceptional productivity, averaging a patent every four days. Throughout the decade, he filed one patent a week, combining these activities with his other activities as a builder, engineer, entrepreneur, publicist, conspirator, manager, husband, and father. Some of his companies include the Edison Electric Light Company, the Machine Works, the Edison Company for Isolated Lightning, and the Edison Ore Milling Company.

mid-November 1881

mid-November 1881

in Tags

Charles Darwin browses through Wilhelm Olbers Focke’s book Die Pflanzen-Mischlinge (Plant Hybrids) but fails to read pages 108-110 (which remain sealed – to be trimmed) where one of the few references of the time to Mendel’s “genetic” theory is contained; the importance of Mendel’s studies will be rediscovered only 4 decades later.

1881

1881

in Tags

The world does not end, as predicted by Mother Shipton (1488 – 1561). In reality, many of these predictions were invented by a man named Hindley in 1871.

1881

1881

in Tags

Egypt. Nationalists rebel against British rule and unilaterally cancel all foreign debt. Queen Victoria disagrees and sends a military force to reestablish control of Egypt, which will remain British until World War II.

September 23, 1881

September 23, 1881

in Tags

Paris Exposition. The arrival from the United States of Thomas Alva Edison’s great dynamo makes a huge impression: it is four times larger than any generator ever seen in Europe. It is dubbed the “Jumbo.” “Edison is not a myth,” admits the newspaper Le Figaro, which had previously denigrated the American handyman.

1881 – 1910

1881 – 1910

in Tags

Between 1881 and 1920, approximately 1.1 million Jews landed and settled in New York, in addition to those who landed in New York but then settled elsewhere, mostly Boston, Baltimore, Philadelphia, and Chicago.

1881 – 1979

1881 – 1979

in Tags

Third American economic and social cycle. From Garfield to Carter. Millions of immigrants arrive in America, mostly from Ireland, Italy, and Eastern Europe. These immigrants are culturally completely different from the previous ones, who had come from England and Scotland. At the same time, the economy runs out of money, and a spiral of savings and reduced investment sets in, resulting in the Great Depression. Franklin Delano Roosevelt, the symbol of this era, manages to reverse the trend by transferring wealth from investors to consumers. Ultimately, however, it is World War II that ends the Great Depression, not the New Deal. The war allows the government to spend enormous amounts of money to build factories and hire workers, accumulating a huge debt, mostly owed to its own citizens, through war bonds. Upon their return, the soldiers manage to buy homes by borrowing and send their children to college, who become white-collar workers and professionals. The Interstate system is built, opening up the vast expanses of North America to the American middle class, who take over the leadership of the country.

1881

1881

in Tags

Hermann von Helmholtz, in his book Popular Lectures of Scientific Subjects, discusses extra-Euclidean geometries. He explains, for example, that two-dimensional creatures could not have digestive systems because they would be separated into two parts. A 3D creature would appear to them like a deity, being able to “pick up” (a term that doesn’t exist in their language) a person from a cell and then place him outside, perhaps by turning him right-left.

March 13, 1881

March 13, 1881

in Tags

Tsar Alexander II is assassinated. Alexander II, Tsar of Russia since 1855, is killed in St. Petersburg by a bomb launched by a member of the revolutionary group “People’s Will.” Formed in 1879, the group carried out terrorist acts and assassinations aimed at overthrowing the tsarist autocracy, and before assassinating him on March 13, 1881, they made several attempts on the tsar’s life. Alexander did much to liberalize and modernize Russia (in 1861 he abolished serfdom), but he always defended his authority, even through repression, especially against reformist movements. On the same day he was assassinated, he had signed a proclamation (the so-called Loris-Melikov Constitution), which provided for the creation of two legislative commissions, composed of indirectly elected representatives. He was succeeded by his son Alexander III, who rejected the Loris-Melikov Constitution. The assassins of Alexander II were arrested and hanged, and their group was finally disbanded.

March 13, 1881

March 13, 1881

in Tags

Alexander II was assassinated by a bomb in St. Petersburg. Two of his sons would suffer violent deaths: Grand Duke Sergei was assassinated by a bomb in the Moscow Kremlin in 1905, and Grand Duke Paul was shot by the Bolsheviks in the Peter and Paul Fortress in 1919.

March 2, 1881

March 2, 1881

in Tags

Thomas Alva Edison and Samuel Insull, who had just arrived from England the day before to manage Edison’s finances, went to 4 Goerck Street, New York, near the East River, to inspect three old factories: an immense old ironworks now crowned by the word “EDISON MACHINE WORKS” in meter-high letters. Edison had leased it, renovated it, and equipped it for $65,000. It would become General Electric.

March 1, 1881

March 1, 1881

in Tags

Thomas Alva Edison leaves Menlo Park, New Jersey, and settles with his family at 72 Fifth Avenue in New York. That same day, Samuel Insull arrives from England to manage Edison’s rather dire finances, as he was almost childlike when it came to money.

February 28, 1881

February 28, 1881

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Menlo Park, New Jersey. Thomas Alva Edison, with his colleague Clarke, is testing a dynamo 16 times more powerful than any previously made. The rotating armature alone weighs a ton and a half. It is attached to a 100-horsepower Porter Allen steam engine. Edison is convinced that the optimal speed is 350 rpm (revolutions per minute). The Porter Allen’s cast iron bed is 60 cm thick to dampen vibrations. But the base begins to shake underfoot. Edison, stopwatch in hand, continues to shout, “Up, up!” Clarke feels his hair stand on end. When they activate the speed indicator, it reads 750 rpm, dangerously close to the point of disintegration. Finally, they slow the engine down.

January 20, 1881

January 20, 1881

in Tags

Giok-Tepe, Central Asia. The Turkmen, traditionally great warriors, put up stubborn resistance to the invading Cossacks of Tsar Russia. The battle marks the end of all resistance to the Russians in Central Asia. The Tsarist army consists of 7,000 soldiers and 60 cannons. The Turkmen casualties number 20,000, while the Russians suffer 60.

January 6, 1881

January 6, 1881

in Tags

Three kings of the financial world, John Pierpot Morgan, Egisto Fabbri, and Jacob C. Rogers, visit Thomas Alva Edison in Menlo Park, New Jersey. J.P. Morgan’s formidable lobbying power helps curb the tax greed of Mayor William Grace, who settles for a flat rate of 5 cents per foot (he had requested 3% of gross profit).

1881

1881

in Tags

Thomas Alva Edison moves his headquarters from Menlo Park, New Jersey, to Manhattan, New York.

January 1881

January 1881

in Tags

Nikola Tesla moves from Prague to Budapest after reading that Edison has granted Tivadar Puskas the rights to build a city telephone network in Budapest. Nikola Tesla asks his uncle to intercede for him to be hired in this business, having served as an officer in the Hussar cavalry, like the person in charge of the telephone project in Budapest: Ference, Tivadar Puskas’s brother. But Tesla is not hired. Instead, he works, still in Budapest, at the government telegraph office, where he acquires electrical skills. But the job is boring, so he quits, and then falls into a depression, which he manages to overcome thanks in part to his new friend Anthony Szigeti, who forces him to go out and exercise.

1880 – 1890

1880 – 1890

in Tags

Cocaine, a powerful alkaloid similar to atropine, is isolated. Coca (Erythroxylon coca) is of American origin. Coca leaves have been used for centuries as a stimulant in Peru, Bolivia, and Ecuador, but in quantities of only half a gram per day, which is estimated to be non-addictive. This method of ingesting the alkaloid in small but frequent doses is similar to our caffeine intake in tea and coffee. The situation is quite different for those who consume extracted and purified cocaine.

1880 – 1910

1880 – 1910

in Tags

There was a sense of the dawning of a new era in which internationalism and shared values would ensure growing prosperity and international order, with Europe firmly at the forefront. Over 100 world fairs were held during this thirty-year period, celebrating erudition, culture, and technological progress. Mathematics, like the other sciences, became a professional activity and reflected the exuberance of the times. The major centers remained the German universities and Paris, but several national mathematical societies were founded (Moscow 1864, London 1865, France 1872, Tokyo 1877, Palermo 1884, New York 1888, Germany 1890).

1880 – 1882

1880 – 1882

in Tags

Astronomers find two (not one) comets in the sky in the same orbit as the Great Comet of 1843. On Earth, in recent months, there has been a debate over the hypothesis that a comet breaks apart due to its close passage across the Sun and the enormous amount of material lost into space. And this is happening before astronomers’ eyes. The fragments were then revisited in 1882, and they turned out to be three large pieces of the original comet. This category of comets was called Kreutz’s Grazing Comets. Other significant fragments will be found in the future, including C/2011 W3 Lovejoy (I’ve seen it!). The original comet from which all the pieces we see today appear to have originated appears to be the Great Comet of 1106.

1880

1880

in Tags

Wabash, Indiana, is the first city in the world to use electric light (a single bulb in the bell tower)

1880

1880

in Tags

In Modena the illiteracy rate is around 70%, and the number of high school students is no more than a thousand.

1880

1880

in Tags

Industrial Revolution: The Singer factory releases the first electric automatic sewing machine model: the 99K (the fifth Singer model overall). By 1900, 40 models were in production, and by 1929, there were as many as 3,000!

1880

1880

in Tags

London. The British government decides, for the first time, to align all timetables in the kingdom with Greenwich Mean Time.

December 20, 1880

December 20, 1880

in Tags

special train arrives in Menlo Park from Thomas Alva Edison with a large concourse of municipal dignitaries. The Kentucky bourbon and cigars are ready. So are the 200 streetlights with filament bulbs along the avenue. Even the gas superintendent (gas lamps were the alternative), Stephen McCormick, admits that filament bulbs are safer, so as not to risk hotel guests never waking up. Councilman John McClave predicts New York will be without gas lamps by 1900. The next morning, the newspapers announce that Edison’s Illuminating Company has been granted permission to bring electric light to 51 blocks in downtown Manhattan between the East River, Nassau, Wall Street, and Spruce Street. Two and a half square kilometers in the most populated area of the city.

November 2, 1880

November 2, 1880

in Tags

Menlo Park, New Jersey. The first power line for Thomas Alva Edison’s streetlights is buried and connected in time for November 2nd, Election Day. Edison, a staunch Republican, issues instructions: “If Garfield is elected, turn everything on; if not, don’t turn it on.” The numbers sway Garfield, and the lights are turned on. A mile of bulbs, glowing with the incandescence of bamboo filaments, illuminate the entire street, from the station to the barn behind Edison’s house. They remain lit until midnight. It is the first time incandescent light bulbs are used to celebrate the victory of a presidential candidate.

August 2, 1880

August 2, 1880

in Tags

Menlo Park, New Jersey. A decisive experiment for the light bulb filament: some Japanese bamboo samples (among the thousands tested) lasted nearly 3.5 hours at the dazzling glow of 71 candela. Another version, dimmed to the more sustainable brightness of 16 candela, lasted a remarkable 1,589 hours. From this day forward, the words bamboo and filament became synonymous in Menlo Park.

May 9, 1880

May 9, 1880

in Tags

Nobel Prize-winning scientist William Crookes believed in ghosts. He attended the séances of the medium Florence Cook. The medium would usually sit behind a curtain in the living room, have the lights turned off, and enter a trance. The curtain would then be lifted and a ghost (ectoplasm) would “appear,” claiming to be called Katy King, but strangely similar to Florence Cook. Moreover, she was not a transparent ghost, but a person who could be touched! Crookes had his doubts, but never checked. A few years later, on May 9, 1880, Florence was caught red-handed: when the curtain was lifted where she was supposed to be, no one was there.

1880

1880

in Tags

United States. Thomas Alva Edison discovers the emission of radiation by metals heated to high temperatures. He calls it the thermionic effect and patents it (without having any idea what use it would actually be made of). In fact, the same effect had already been reported by Englishman Frederick Guthrie in 1873.