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Stroboflash
Stroboflash is the name of one of the earliest commercially successful portable dry cell battery powered electronic flashes produced.
==History of development==
It was designed and initially manufactured in 1942 by Strobo Research, a company founded by Edward Farber and Harold Edgerton that was located in Milwaukee, Wisconsin. Stroboflash electronic flashes were used extensively by newspaper photographers as an alternative to flash bulbs. In 1955, Stroboflash was sold by Strobo Research to Graflex, Inc., a now defunct company that also produced sheet film large format cameras and a host of camera accessories and was located in Rochester, New York. There were four models of Stroboflash, aptly designated as Stroboflash I, Stroboflash II, Stroboflash III and Stroboflash IV. The Stroboflash I used two 240 volt dry cell batteries that are no longer made and was the lightest of the four models and produced 50 watt seconds of light power. The Stroboflash II, III and IV were powered by two 225 volt dry cell batteries that are still produced by Eveready, but are now quite expensive (two #489 225 volt batteries hooked up to produce 450 volts). The Stroboflash II and Stroboflash IV were produced by Graflex through 1975, when Graflex, Inc. sold the Stroboflash IV to another company called Graflite that produced it until about 1978, then they also went out of business. The Stroboflash III was only produced for a few years. It put out 200 watt seconds of light power, but could not be turned down. It was replaced by the Stroboflash IV that had four power setting that could be selected via a rotary top mounted switch: 1/4 (50 watt seconds), 1/2(100 watt seconds), 3/4(150 watt seconds) and full (200 watt seconds). The Stroboflash II had a constant 100 watt second light output that was not adjustable.
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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