Day in Engineering History Archive - April 3

April 3

World's first cellphone call placed. Click here to return to the RF Cafe homepage.Day in Engineering History April 3 Archive - RF Cafe1449: The first known British patent was issued to John of Utynam for a method of making stained glass. 1827: German physicist Ernst Chladni, known as "the father of acoustics," died. 1829: James Carrington patented his coffee mill - a very important invention! 1860: Pony Express service was inaugurated in San Francisco; it lasted only a year and a half once the telegraph came online. 1926: Astronaut Virgil "Gus" Grissom was born. 1948: President Truman signed the Economic Recovery Act, known as Marshall Plan, which allocated more than $5 billion in aid for 16 European countries. 1965: The SNAP 10 ion engine satellite became the first nuclear reactor to orbit Earth. 1973: The first portable phone (cellphone) call was placed by Motorola employee Martin Cooper on his 10"x3"x1.5", 30 oz. DynaTAC 8000X "shoe box phone." 1996: Unabomber Theodore Kaczynski was arrested. 2000: the Nasdaq set a one-day record when it lost 349.15 points (before Bush was even elected).

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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.