1836: André-Marie Ampère, after whom the unit of current is named, died. 1854: Bernhard Riemann proposed that space is curved. 1854: The U.S. Naval Academy in Annapolis, MD, held its first graduation. 1909: The SOS distress signal ( − − − • • • − − − ) was used for the first time by the Cunard liner SS Slavonia when it wrecked off the Azores. 1932: Artificial lightning using 10 MV was demonstrated by GE. 1940: Italy declared war on France and Britain; Canada declared war on Italy. 1943: The ball point pen was patented by Laslo Biro. 1952: Mylar became a registered trademark for DuPont's extraordinarily strong polyester film. 1977: Apple Computer shipped its first Apple II. 1996: Intel released the 200 MHz Pentium. 2000: The Millennium Bridge, a footbridge across the River Thames, was opened by Queen Elizabeth.
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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.