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03-24-2017, 05:20 PM
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#10 |
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Goon Squad Leader
Join Date: Nov 2004
Location: Seattle
Posts: 27,063
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Re: Fresnel
I have a large Fresnel lens I scavenged from a big projection TV. On a sunny day it can concentrate enough sunlight to make a dark rag burst into flame in about six seconds.
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