A 19th-Century oxidised brass surveying transit theodolite, signed on the silvered compass dial W. & L.E. Gurley Troy N.Y., the telescope with rack and pinion focusing, graduated bubble level, the axis incorporating a vertical half-circle with silvered scale and vernier, tangent screw fine adjustment, supported on two A-frames over the horizontal plate, with level and cross-bubble, rack and pinion fine adjustment for the twin verniers to the enclosed silvered horizontal scale, on 4 screw tripod mounting, with makers trade label and some accessories, in fitted mahogany case - 12¾in. (32.4cm.) high.

細節

A 19th-Century oxidised brass surveying transit theodolite, signed on the silvered compass dial W. & L.E. Gurley Troy N.Y., the telescope with rack and pinion focusing, graduated bubble level, the axis incorporating a vertical half-circle with silvered scale and vernier, tangent screw fine adjustment, supported on two A-frames over the horizontal plate, with level and cross-bubble, rack and pinion fine adjustment for the twin verniers to the enclosed silvered horizontal scale, on 4 screw tripod mounting, with makers trade label and some accessories, in fitted mahogany case - 12¾in. (32.4cm.) high.
See illustration