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Day in Engineering History Archive - January 15

January 15

Lee de Forest Receives Patent for Triode Tube  Please click here to visit RF Cafe.Day in Engineering History January 15 Archive - RF Cafe1861: The safety elevator was patented as a "Hoisting Apparatus" by Elisha Otis, of Yonkers, NY. 1870: The Democratic party was first represented as a donkey in a cartoon by Thomas Nast in Harper's Weekly. 1907: The three-element vacuum tube (triode) patent was issued to its inventor, Dr. Lee de Forest as a "device for amplifying feeble electric currents - such, for example, as telephone currents." 1908: Edward Teller, "father of the H-bomb," was born. 1943: The Pentagon, the world's highest capacity office building, was dedicated in Arlington, VA. 1967 :The first Super Bowl was played as the Green Bay Packers of the NFL defeated the Kansas City Chiefs of the American Football League, 35-10. 1970: William Piper, producer of the infamous J-3 aircraft, died. 1974: "Happy Days" first aired on ABC. 2001: Wikipedia, the source used for many of the events listed here, first went online.

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Note: These 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.

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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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