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DPChallenge Forums >> Photography Discussion >> Photography Milestones, on National Geographic
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 12/01/2010 11:08:58 PM · #1
While researching for a history class, I found this page on National Geographic. It details several milestones in photography & was entertaining to view:

Photography Milestones on NG
 12/02/2010 04:09:29 AM · #2
I'd love to know how William Longley and Charles Martin got the underwater color photos using "highly explosive magnesium flash powder".

The flash powder would have to be contained in a transparent waterproof housing, right? No problem, but what happens to the huge amount of quickly expanding gas when the powder is ignited? I bet they blew up a few flash units before they worked the bugs out. :)

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