细节
J. DAVIS, Derby
A lacquered-brass mining dial, with silvered dial, edge-bar needle, level, cross-bubble, folding sights, cover and staff mount -- 10in.(26cm.) wide, in fitted wood case; and a tripod
A lacquered-brass mining dial, with silvered dial, edge-bar needle, level, cross-bubble, folding sights, cover and staff mount -- 10in.(26cm.) wide, in fitted wood case; and a tripod
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See illustration