I was looking at the new Bing 3D service that takes various photos and combines them into 3D exploration of places. This aluminum tripod caught my eye in one of the photos, used both it and a wooden one on sites in NY and NJ with a couple of different 3D point recording infrared transits or tacheometers (or “tachymeter“ fast recording) which at the time required a corner prism as a target, today up to 100 meters will bounce and record speed of light and telescope angles. With a number of mirrors, they go out to 8 or 10,000 meters. Lasers are even more powerful and are bounced off prisms on the Moon, a recent Russian one found after all these years left there by one of the former Soviet’s lunar rovers.
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