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The Water Cooler
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Info on a old range finder
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<blockquote data-quote="JEVapa" data-source="post: 3829314" data-attributes="member: 41176"><p>I talked to my bus partner, and he said it's an old optical RF that works like a survey tool. He said there should be a dial on it and an optic and you are supposed to get certain angles from points and then do real math to get a range. Once LRFs came out, these disappeared. It looks like you have the instructions...I'd keep it all together. They sell on ebay for between $20-$40. </p><p></p><p>I looked them up and they are actually all over; used by the forest service, BLM (not the commies), etc. Probably surveyors too.</p><p></p><p>[URL unfurl="true"]https://www.fs.fed.us/eng/pubs/html/98241307/98241307.html[/URL]</p><p><em>From the above website:</em></p><p><strong><em>"Optical</em></strong></p><p>Optical distance-measuring devices typically use the coincidence method of determining distance; which uses a series of lenses and mirrors to produce a double image. The double images on mirrors are brought together by rotating a dial until both images merge into one. The dial has a distance indicator. When the two images merge, the distance to the target is read directly off the dial."</p></blockquote><p></p>
[QUOTE="JEVapa, post: 3829314, member: 41176"] I talked to my bus partner, and he said it's an old optical RF that works like a survey tool. He said there should be a dial on it and an optic and you are supposed to get certain angles from points and then do real math to get a range. Once LRFs came out, these disappeared. It looks like you have the instructions...I'd keep it all together. They sell on ebay for between $20-$40. I looked them up and they are actually all over; used by the forest service, BLM (not the commies), etc. Probably surveyors too. [URL unfurl="true"]https://www.fs.fed.us/eng/pubs/html/98241307/98241307.html[/URL] [I]From the above website:[/I] [B][I]"Optical[/I][/B] Optical distance-measuring devices typically use the coincidence method of determining distance; which uses a series of lenses and mirrors to produce a double image. The double images on mirrors are brought together by rotating a dial until both images merge into one. The dial has a distance indicator. When the two images merge, the distance to the target is read directly off the dial." [/QUOTE]
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