1821: Russian mathematician
after whom the Chebyshev filter transfer function is named, was born. 1830: Mathematician
Fourier died. 1831: David Hughes, inventor of the carbon microphone, was born. 1866:
was invented by Charles Hires. 1881: The first
electric tram for the public started service in Germany. 1866: The
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
completed its maiden voyage. 2002: Star Wars: Episode II - Attack of the Clones, was released in theaters.
| Feb | Mar |
Apr | May |
Jun | Jul |
Aug | Sep |
Oct | Nov |
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.