Former co-worker picked this up.
Any ideas?
Absent a higher-resolution image, my best guess is an oversize pepper grinder.
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Looks like a device used by greenskeepers to dig new holes on golf greens
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Guessing here also. Believe the instrument is upside down and it is designed to hang from overhead. Could be a crude transit for underground mine surveying designed to hang from a mine spad driven into the tunnel roof. Level against the roof and use to measure angles in existing tunnels or direct digging operations.
Mine spads:
Always carried a few of the type in the lower photo in my survey vehicle.
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I have never seen anything like that. It could possibly be a "home made" thing-a-ma-jig for a special use.
I do like the idea of inverted use for underground applications given that the numbers are up-side-down.
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Used by forest rangers to locate forest fires?
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Dave, that was the consensus of opinion, but the level vials would be inverted.
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plumb bob roof spads for mining
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> Dave, that was the consensus of opinion, but the level vials would be inverted.
Properly formed vials, conical taper from center to both ends, will work upside down. Carpenters levels are made that way. Suspended from the mine roof with shims between roof and leveling screws bubbles would be just above working eye level for the scope. Right where a miners lamp would illuminate them.
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Some online research found a link to a "Hanging compass from a mine surveyor's kit, 18th century." Description of use would be very similar to what I was thinking of with the mine spads for instrument and site points.
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Does it have an inverted image scope? Maybe somebody tried to "FIX" it.