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1940 in science
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==Technology== * May 26 β First free flight of [[Igor Sikorsky]]'s [[Vought-Sikorsky VS-300]] [[helicopter]], in the United States. * September 21 β [[American Bantam]] deliver the first prototype BRC Quarter-Ton General Purpose Vehicle β the [[four-wheel drive]] [[Jeep]], designed by [[Karl Probst]].<ref>{{cite web|author=((Auto Editors of Consumer Guide))|title=1906-1939 Jeep: Jeep Makes History|url=http://auto.howstuffworks.com/1906-1939-jeep4.htm|work=HowStuffWorks|accessdate=2012-05-31|archive-date=2012-05-01|archive-url=https://web.archive.org/web/20120501212215/http://auto.howstuffworks.com/1906-1939-jeep4.htm|url-status=dead}}</ref> * November 7 β The new [[Tacoma Narrows Bridge (1940)|Tacoma Narrows Bridge]] collapses due to [[aeroelastic flutter]]. * [[Donald Leslie]] demonstrates the [[Leslie speaker]], intended as an adjunct to the [[Hammond organ]].
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