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.
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historical tidbits have been collected from various sources, mostly on the Internet.
As detailed in
this article, there is
a lot of wrong information that is repeated hundreds of times because most websites do
not validate with authoritative sources. On RF Cafe, events with
hyperlinks have been verified. Many years ago, I began
commemorating the birthdays of notable people and events with
special RF Cafe logos. Where
available, I like to use images from postage stamps from the country where the person
or event occurred. Images used in the logos are often from open source websites like
Wikipedia, and are specifically credited with a hyperlink back to the source where possible.
Fair Use laws permit small
samples of copyrighted content.