French Four-vane Surveying Instrument, with 2 1/2-in. dia. silvered horizontal dial calibrated 0-360 and marked B T E and S.G.D.G., four hinged sighting vanes and ball joint leveling mount, ht. 12 1/2 in.
French Four-vane Surveying Instrument, with 2 1/2-in. dia. silvered horizontal dial calibrated 0-360 and marked B T E and S.G.D.G., four hinged sighting vanes and ball joint leveling mount, ht. 12 1/2 in.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
