•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe™

Sitemap

Day in Engineering History Archive - June 21

| 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.

June 21

Happy Birthday to Siméon-Denis Poisson. - Please click here to visit RF Cafe.    SpaceShipOne logo

Summer Solstice.  Please click here to visit RF Cafe

1781: Siméon-Denis Poisson, mathematician and experimenter in electromagnetic theory, was born. 1788: The U.S. Constitution went into effect when New Hampshire became the 9th state of ratification. 1874: Anders Ångström, after whom the unit of wavelength is named, died. 1893: The first Ferris wheel premiered at Chicago's Columbian Exposition. 1913: Georgia Broadwick became the first woman to parachute from an airplane. 1945: U.S. troops took the island of Okinawa. 1948: The first successful long-playing microgroove phonograph records were introduced to the public. 1948: The Small-Scale Experimental Machine (SSEM), the first stored-program computer, ran its first program. 1986: Lloyd Espenschied, co-inventor of coaxial cable, died. 2004: Mike Melvill became the first civilian to pilot a craft into space, in Rutan's SpaceShipOne. 2005: The world's first solar sail spacecraft, funded by the non-profit U.S. Planetary Society, was placed in orbit.


Custom Search
More than 10,000 searchable pages indexed.

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger... single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website