A lacquered-brass protractor, the arc divided 0°-60°, with vernier on L-shaped arm -- 11¾in.(30cm.)long, in fitted mahogany case

细节
A lacquered-brass protractor, the arc divided 0°-60°, with vernier on L-shaped arm -- 11¾in.(30cm.)long, in fitted mahogany case

拍品专文

A printed description accompanying this lot describes it as being for "transposing and anticipating azimuth bearings during chart work".