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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 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 ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

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Day in Engineering History Archive March 13

March 13

Sir William Herschel discovered Uranus. Click here to return to the RF Cafe homepage.1773: Joseph Priestley, discoverer elemental oxygen, ammonia, hydrochloric acid gas, carbon monoxide, sulfur dioxide, and oxides of nitrogen, was born. 1781: The planet Uranus was discovered by Sir William Herschel. 1842: Henry Shrapnel, inventor of the type of mortar that bears his name, died. 1855: Percival Lowell, the American astronomer who helped discover Pluto and believed that there was life on Mars, was born. 1933: Astronomer Robert Innes, who discovered Proxima Centauri, the closest star to our sun, died. 1937: Elihu Thomson, electrical engineer and inventor whose discoveries in the field of alternating current led to the development of successful alternating current motors, died. 1886: Albert Stevens, who took the first photograph of Earth showing its curvature, was born. 1989: A series of solar flares caused a violent magnetic storm that brought power outages over large regions of Canada.  1992: The FCC ruled companies can own 30 AM and 30 FM stations. 1998: German engineer Hans von Ohain, who developed the first operational jet engine (HeS3b used in the Heinkel He 178), died. 2012: Tom Johnson, founder of the Celestron telescope company, died.

| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |

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.
Please submit significant historical events and dates for inclusion in these lists. I will be glad to include your name and birthday. Please do not submit your death date ;-) A couple 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.