细节
A 19th-Century surveying level,
signed on the silvered dial Troughton & Simms LONDON, with engraved scale and edge-bar needle, graduated bubble-level, rack and pinion focusing, lens hood and dust slide, the compass raised over the limb by four slender columns, the limb engraved J. Dobson and C.D.PICKERSGILL, in the original fitted mahogany case -- 15in. (38.1cm.) wide
See Illustration
signed on the silvered dial Troughton & Simms LONDON, with engraved scale and edge-bar needle, graduated bubble-level, rack and pinion focusing, lens hood and dust slide, the compass raised over the limb by four slender columns, the limb engraved J. Dobson and C.D.PICKERSGILL, in the original fitted mahogany case -- 15in. (38.1cm.) wide
See Illustration