May 16 1821: Russian mathematician Pafnuty Chebyshev, after whom the Chebyshev filter transfer function is named, was born. 1830: Mathematician Jean-Baptiste-Joseph Fourier died. 1831: David Hughes, inventor of the carbon microphone, was born. 1866: Root beer was invented by Charles Hires. 1881: The first electric tram for the public started service in Germany. 1866: The nickel replaced the half-dime coin. 1933: Thomas Edison was issued his last patent - for an electro-plating device. 1946: Jack Mullin showed the world the first magnetic tape recorder. 1960: A synthetic ruby crystal laser was first operated at Hughes Research Laboratories. 1963: After 22 Earth orbits Gordon Cooper returned to Earth, ending Project Mercury. 1975: Junko Tabei became the first woman to reach the summit of Mount Everest. 1992: The space shuttle Endeavour completed its maiden voyage. 2002: Star Wars: Episode II - Attack of the Clones, was released in theaters. |