Gravity Powered Lights
Posted: Jan 17, 2013 11:12 amThis could be a great thing for extended cave trips or remote places. Gravity Light. There's a video at the bottom of the article.
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Gravity Powered Lights
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Posted: Jan 17, 2013 11:12 amRe: Gravity Powered Lights
Posted: Jan 17, 2013 12:12 pmI assume you are reccomending it for camping purposes, imagine a bunch of cavers with sacks of ballast swinging from their heads