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Day in Engineering History Archive - May 25

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| 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.

May 25

Memorial Day - Remember Our Fallen Servicemen!  Please click here to visit RF Cafe.

Igor Sikorsky logo

1844: The gasoline engine was patented by Stuart Perry. 1865: Pieter Zeeman who won Nobel Prize in Physics for splitting of spectral lines (the Zeeman effect), was born. 1888: Nobel Prize winner Ascanio Sobrero, who discovered nitroglycerine, died. 1889: Helicopter pioneer Igor Sikorsky was born. 1927: Henry Ford stopped producing Model T car and began producing the Model A. 1940: Penicillin ("mould juice" per its discoverer), was tested and proven effective by Norman Heatley. 1961: President Kennedy announced his goal to initiate a goal of "landing a man on the moon" before the end of the decade. 1973: The U.S. launched the first Skylab crew. 1992: Jay Leno made his debut as permanent host of NBC's "Tonight Show," succeeding Johnny Carson. 1999: Waldo Semon, the inventor of PVC plastic, died. 2008: NASA's Phoenix spacecraft landed on Mars, in search of life.


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RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
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