A 19th-Century brass transit theodolite, signed on the compass dial Heller & Brightly Makers Philad , the telescope with rack and pinion focusing and graduated bubble level, the axis raised on twin supports from the horizontal plate incorporating level and cross-bubble, the compass with silvered scale and edge-bar needle, with jewelled cap and clamp, the enclosed silvered scale with twin verniers and tangent screw adjustment, in fitted case numbered 6303 - 13½in. (34.3cm.) long.

细节

A 19th-Century brass transit theodolite, signed on the compass dial Heller & Brightly Makers Philad , the telescope with rack and pinion focusing and graduated bubble level, the axis raised on twin supports from the horizontal plate incorporating level and cross-bubble, the compass with silvered scale and edge-bar needle, with jewelled cap and clamp, the enclosed silvered scale with twin verniers and tangent screw adjustment, in fitted case numbered 6303 - 13½in. (34.3cm.) long.