Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes USAF radar shop Notable Quotes App Notes Calculators Education Engineering Magazines RF Cafe Software,T-Shirts,Coffee Mugs Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Stencils for Visio RF & EE Shapes for Word Advertising RF Cafe Homepage Sudoku puzzles Test notes Thank you for visiting RF Cafe!
everythingRF RF & Microwave Parts Database (h2) - RF Cafe

Day in Engineering History Archive - May 15

May 15

Peace Officers Memorial Day - Please click here to visit RF Cafe.Day in Engineering History May 15 Archive - RF CafeToday is Peace Officers Memorial Day. 1618: Johannes Kepler discovered his harmonics law. 1836: Francis Baily observed "Baily's Beads" during an annular solar eclipse. 1863: Frank Hornby, English toy manufacturer who patented the Meccano construction set, was born. 1859: Nobel laureate Pierre Curie, who along with his wife, Marie, discovered spontaneous radioactivity in radium and polonium, was born. 1930: Ellen Church became the first airline stewardess. 1941: Britain's first jet-propelled aircraft, the Gloster-Whittle E.28/39, made its first flight. 1948: Israel was attacked by Transjordan (now Jordan), Egypt, Syria, Iraq and Lebanon only hours after declaring its independence. 1957: Great Britain became the 3rd nation to detonate a nuclear bomb. 1970: President Nixon appointed America's first two female generals: Colonels Elizabeth Hoisington and Anna Mae Mays. 1982: Merle Tuve who first used pulsed radio waves to explore the ionosphere, died. 1992: Robert Morris Page, inventor of pulse radar, died. 2008: Physics Nobel laureate Willis Lamb, who determined fine structure of the hydrogen spectrum, 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. 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.

ERZIA (RF amplifiers, wireless, communications) - RF Cafe
Rohde & Schwarz USA (RF Component Pocket Guide) - RF Cafe Axiom Test Equipment - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2018
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

spacer