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<p>to <a href="page.php?w=mains_power">mains power</a>.  They are either synchronized with the camera using a <a href="page.php?w=flash_synchronization">flash synchronization</a> cable or radio signal, or are light-triggered, meaning that only one flash unit needs to be synchronized with the camera, and in turn triggers the other units, called slaves.</p>

<p><big>Types</big></p>
<p><big>Flash-lamp and flash powder</big></p>
<p>Studies of <a href="page.php?w=magnesium">magnesium</a> by <a href="page.php?w=Robert_Bunsen">Bunsen</a> and <a href="page.php?w=Henry_Enfield_Roscoe">Roscoe</a></p><p>
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