Day in History Archive April 29

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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. All will eventually be either verified or removed.
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 ;-)
 

April 29

1879: Electric arc lights were used for the first time, in Cleveland's Public Square (then known as Monumental Park). 1893: American Nobel physicist Harold Urey, who discovered deuterium, was born. 1913: Gideon Sundback patented the zipper. 1921: David Sarnoff became general manager of RCA. 1937: Wallace Carothers, developer of nylon, died. 1945: American soldiers liberated the Dachau concentration camp. 1953: The first 3-D television broadcast was made by KECA-TV in Los Angeles, CA. 1966: William Eccles, who coined the term "diode," died. 1997: Astronaut Jerry Linenger and cosmonaut Vasily Tsibliyev went on the first U.S.-Russian space walk.