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flashlamp
The electric flash-lamp uses electric current to start flash powder burning, to provide a brief sudden burst of bright light. It was principally used for flash photography in the early 20th century but had other uses as well. Previously, photographers' flash powder, introduced in 1887 by Adolf Miethe and Johannes Gaedicke, had to be ignited manually, exposing the user to greater risk.
== Invention ==
The electric flash-lamp was invented by Joshua Cohen (a.k.a. Joshua Lionel Cowen of the Lionel toy train fame) in 1899, and by Paul Boyer in France.〔(''Panthéon de la Légion d'honneur'', vol. 2, by T. Lamathière )〕 It was granted U.S. patent number 636,492.〔(Patent No. 636,492 )〕 This flash of bright light from the flash-lamp was used for indoor photography in the late nineteenth century and the early part of the twentieth century.
Joshua Lionel Cowen's flash-lamp patent 636,492 reads in part,
The principle of operation of the electrical flash-lamp is linked to the shutter of an early box camera: tripping the shutter ignites the flash powder and releases the potential energy of the exploding powder causing a bright flash for indoor photography.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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