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Day in Engineering History Archive - June 20

June 20

U.S. Army Air Force Established - Please click here to visit RF Cafe.Day in Engineering History June 20 Archive - RF Cafe1918: The X-ray expert Dr. Eugene W. Caldwell, died of X-ray burns in NY. 1840: Samuel Morse was granted a patent for telegraphy signals. 1935: The U.S. Army Air Forces established and headed by General Hap Arnold, replacing the Army Air Corps. 1939: The world's first airplane to be propelled solely by a liquid-fuelled rocket, the Heinkel He-176, flew for first time. 1942: Japanese submarine I-25 launched an attack on Fort Stevens, located on the Columbia River in OR. 1950: Willie Mays graduated from high school and immediately signed with the New York Giants. 1977: The Trans-Alaska Pipeline began carrying oil from the Arctic Ocean to Prince William Sound. 1980: "Blues Brothers" with Dan Aykroyd and John Belushi premiered. 1981: Henri-Gaston Busignies, developer of HF (high frequency) direction finding equipment, died. 1996: Westinghouse Electric agreed to buy Infinity Broadcasting for $4.9 billion. 2005: Jack Kilby, inventor of the integrated circuit, died. 2006: IBM and the Georgia Institute of Technology demonstrated the first silicon-based transistor that operates at 500 GHz.

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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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    BSEE - KB3UON

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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