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BATTERY A battery is a device that converts chemical energy into electrical energy. Each battery has two electrodes, an anode (the positive end) and a cathode (the negative end). An electrical circuit runs between these two electrodes, going through a chemical called an electrolyte (which can be either liquid or solid). This unit consisting of two electrodes is called a cell (often called a voltaic cell or pile). Batteries are used to power many devices and make the spark that starts a gasoline engine. Alessandro Volta was an Italian physicist invented the first chemical battery in 1800. Storage batteries are lead-based batteries that can be recharged. In 1859, the French physicist Gaston Plante (1834-1889) invented a battery made from two lead plates joined by a wire and immersed in a sulfuric acid electrolyte; this was the first storage battery. The dry cell is a an improved voltaic cell with a cylindrical zinc shell (the zinc acts as both the cathode and the container) that is lined with an ammonium chloride (the electrolyte) saturated material (and not a liquid). The dry cell battery was developed in the 1870s-1870s by Georges Leclanche of France, who used an electrolyte in the form of a paste. Edison batteries (also called alkaline batteries) are an improved type of storage battery developed by Thomas Edison. These batteries have an alkaline electrolyte, and not an acid. |
BASKETBALL |
BELL, ALEXANDER GRAHAM Alexander Graham Bell (March 3, 1847, Edinburgh, Scotland - August 2, 1922, Baddek, Nova Scotia) invented the telephone (with Thomas Watson) in 1876. Bell also improved Thomas Edison's phonograph. Bell invented the multiple telegraph (1875), the hydroairplane, the photo-sensitive selenium cell (the photophone, a wireless phone, developed with Sumner Tainter), and new techniques for teaching the deaf to speak. In 1882, Bell and his father-in-law, Gardiner Hubbard, bought and re-organized the journal "Science." Bell, Hubbard and others founded the National Geographic Society in 1888; Bell was the President of the National Geographic Society from 1898 to 1903. |
BRAILLE TYPEWRITER The Hall Braille typewriter (also called a Braillewriter or Brailler) was invented in 1892 by Frank Haven Hall. Hall was the Superintendent of the Illinois Institution for the Blind. The Hall Braille typewriter was manufactured by the Harrison & Seifried company in Chicago, Illinois, USA. Hall introduced his invention on May 27, 1892, at Jacksonville, Illinois. It types raised Braille dots onto paper. |
CARVER, GEORGE WASHINGTON![]() For more information on Carver, click here. For a cloze (fill-in-the-blank) activity on Carver, click here. |
EDISON, THOMAS ALVA
Edison's first job was as a telegraph operator, and in the course of his duties, he redesigned the stock-ticker machine. The Edison Universal Stock Printer gave him the capital ($40,000) to set up a laboratory in Menlo Park, New Jersey, to invent full-time (with many employees). Edison experimented with thousands of different light bulb filaments to find just the right materials to glow well, be long-lasting, and be inexpensive. In 1879, Edison discovered that a carbon filament in an oxygen-free bulb glowed but did not burn up for quite a while. This incandescent bulb revolutionized the world. |
ELEVATOR BRAKE![]() In 1854, at the Crystal Palace Exposition in New York, Otis demonstrated how safe his elevator was by cutting the elevator's cable with an ax, and the elevator car stayed where it was in the shaft. Otis' invention spurred the development of skyscrapers, changing the look of cities around the world forever. |
FOUCAULT, JEAN |
FOX, SAMUEL |
GYROSCOPE |
LATIMER, LEWIS H. For more information on Lewis Howard Latimer, click here. |
LECLANCHE, GEORGES The dry cell is a an improved voltaic cell (battery) that has a cylindrical zinc shell (the zinc acts as both the cathode and the container) that is lined with an ammonium chloride (the electrolyte) saturated material (and not a liquid). Although called dry, dry cells are not entirely dry, but they are less bulky and more easily transported than earlier batteries. The dry cell battery was developed in the 1870s-1870s by Georges Leclanché (1839-1882), a French engineer, who used an electrolyte in the form of a paste in his new battery. |
Guglielmo Marconi (1874-1937) was an Italian inventor and physicist. In 1895, Marconi invented the radio (wireless telegraphy), building machinery to transmit and receive radio waves. His first transmission across an ocean (the Atlantic Ocean) was on December 12, 1901. Marconi won the Nobel Prize for Physics in 1909. |
McCOY, ELIJAH For more information on Elijah McCoy, click here. For a cloze activity on McCoy, click here. |
The earliest motorcycle was a coal-powered, two-cylinder, steam-driven motorcycle that was developed in 1867 by the American inventor Sylvester Howard Roper. A gas-powered motorcycle was invented by the German inventor Gottlieb Daimler in 1885. His mostly wooden motorcycle had iron-banded wheels with wooden spokes. This bone-crunching vehicle was powered by a single-cylinder engine. |
James Naismith (1861-1939) was a Canadian physical education instructor who invented the game of basketball in 1891. He developed this indoor game so that his students could participate in sports during the winter. In his original game, which he invented while at the Springfield, Massachusetts YMCA (Young Men's Christian Association), Naismith used a soccer ball which were thrown into peach baskets (with their bottoms intact). The first public basketball game was in Springfield, MA, USA, on March 11, 1892. Basketball was first played at the Olympics in Berlin Germany in 1936 (America won the gold medal, and Naismith was there). Naismith was inducted into the Basketball Hall of Fame in 1978. |
PLANTE, GASTON In 1859, the French physicist Raymond Gaston Planté (April 22, 1834-1889) invented a battery made from two lead plates joined by a wire and immersed in a sulfuric acid electrolyte; this was the first storage battery. Storage batteries are batteries that can be recharged. |
POTATO CHIPS The potato chip was invented in 1853 by George Crum. Crum was a Native American/African American chef at the Moon Lake Lodge resort in Saratoga Springs, New York, USA. French fries were popular at the restaurant and one day a diner complained that the fries were too thick. Although Crum made a thinner batch, the customer was still unsatisfied. Crum finally made fries that were too thin to eat with a fork, hoping to annoy the extremely fussy customer. The customer, surprisingly enough, was happy - and potato chips were invented! For more information on George Crum and potato chips, click here. |
PUSHPIN The push pin ("a thumbtack with an elongated handle that makes it easier to put in and remove") was invented by the Pennsylvanian inventor Edwin Moore in 1900. Moore started a company producing these useful pins in 1900. After years of growing, his company incorporated on July 19, 1904, and was called the "Moore Push-Pin Company." The company 1912 through 1977, the Company was located in Germantown, Pennsylvania.
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The radio was invented by Nikola Tesla. The radio was promoted and popularized by Guglielmo Marconi in 1895. The first radio transmission across an ocean (the Atlantic Ocean) occurred on December 12, 1901. |
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RENO, JESSE W. Jesse W. Reno was an American inventor who developed the first escalator in 1891. An escalator is a moving stairway that helps people move easily from floor to floor in building. On his "inclined elevator," passengers rode on an wedge-shaped supports attached to a conveyor belt at an incline of about 25 degrees. The original elevator had a stationary handrail (which was soon replaced with a moving handrail). |
X-rays were discovered in 1895 by Wilhelm Konrad von Roentgen (1845-1923). Roentgen was a German physicist who described this new form of radiation that allowed him to photograph objects that were hidden behind opaque shields. He even photographed part of his own skeleton. X-rays were soon used as an important diagnostic tool in medicine. Roentgen called these waves "X-radiation" because so little was known about them. |
Sylvester Howard Roper (1823-1896) was an American inventor from New Hampshire and Massachusetts. Roper developed a coal-powered, two-cylinder, steam-driven wooden motorcycle in 1867. Roper also developed a steam-driven car. Roper died at the age of 73 while testing a new motorcycle. |
The first practical electric light bulb was made in 1878 simultaneously (and independently) by Joseph Wilson Swan and Thomas Alva Edison. Sir Joseph Wilson Swan (1828-1914) was an English physicist who was determined to devise a practical, long-lasting electric light. After many years of experimentation, he found that a carbon paper filament worked well, but burned up quickly. In 1878, he demonstrated his new electric lamps in Newcastle, England. |
TELEPHONE The telephone (meaning "far sound") is the most widely used telecommunications device. It was invented in 1876 by Alexander Graham Bell (with Thomas Watson). Bell patented his invention on March 1876 (patent No. 174,465). His device transmitted speech sounds over electric wires, and his idea has remained one of the most useful inventions ever made. |
TESLA, NIKOLA For a page on Tesla, click here. |
X-rays were discovered in 1895 by Wilhelm Konrad von Roentgen (1845-1923). Roentgen was a German physicist who described this new form of radiation that allowed him to photograph objects that were hidden behind opaque shields. He even photographed part of his own skeleton. X-rays were soon used as an important diagnostic tool in medicine. Roentgen called these waves "X-radiation" because so little was known about them. |
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