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#17
November 11th 04, 10:31 AM
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On Wed, 10 Nov 2004 14:47:56 GMT, "William W. Plummer"
wrote: Just how does modern surveying equipment work? One guy holds one of those mirrors (actually a prism) that reflects light back to the source, independent of the angle of the mirror. The instrument head contains a laser. Distances must be measured by angles, but how? Speed of light? all the best -- Dan Ford email: (put Cubdriver in subject line) Warbird's Forum www.warbirdforum.com Piper Cub Forum www.pipercubforum.com the blog www.danford.net 
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