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Day in Engineering History Archive - December 25

Merry Christmas! Day in Engineering History December 25  - RF CafeDecember 25

Merry Christmas! Joyeux Noël! Frohe Weihnachten! Buon Natale! Feliz Navidad! веселое рождество! Καλά Χριστούγεννα! _ 快活圣诞节! 즐거운 성탄!  Please click here to visit RF Cafe.1642: Sir Isaac Newton was born (per the Julian calendar used then). 1741: The Centigrade temperature scale was devised by astronomer Anders Celsius. 1776: General George Washington and his troops crossed the Delaware River for a surprise attack against Hessian forces at Trenton, NJ. 1868: Linus Yale, inventor and manufacturer of locks, including the cylinder or pin-tumbler lock known by his name, died.  1988: Ernst Ruska, an electrical engineer who invented the electron microscope, was born. 1939: "A Christmas Carol," by Charles Dickens, was read on CBS radio for the first time. 1966: St. Elmo Brady, the first black man to earn a PhD in chemistry, died. 1977: Silent films legend Charlie Chaplin died.

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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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Copyright: 1996 - 2018
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    Kirt Blattenberger,
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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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