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Flashlight
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== Etymology == Early flashlights ran on [[zinc–carbon battery|zinc–carbon batteries]], which could not provide a steady electric current and required periodic "rest" to continue functioning.<ref name="Nonrechargeable batteries">{{cite encyclopedia|author=Brooke Schumm |title=Nonrechargeable Batteries |encyclopedia=The Electrochemistry Encyclopedia |url=http://electrochem.cwru.edu/encycl/art-b02-batt-nonr.htm |access-date=2010-12-13|archive-url=https://web.archive.org/web/20131022104620/http://electrochem.cwru.edu/encycl/art-b02-batt-nonr.htm |archive-date=2013-10-22 }}</ref> Because these early flashlights also used energy-inefficient carbon-filament bulbs, "resting" occurred at short intervals. Consequently, they could be used only in brief flashes, hence the common North American name "flashlight".<ref name="flashlightmuseum"/>
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