Lerbours Secretan Theodolite, France, 19th century, 7-in. spoked horizontal circle with scale reading 0-360, single spirit level, rotating arm with dual verniers at opposite points, one with a fine adjustment knob and engraved "Lerbours et Secretan a Paris," and an adjustable 9-in. scope, mounted to a contemporary base, ht. 9 in.
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