Details
A golden-lacquered-brass mining level,
by John Davis & Son Darby Ltd., No. 4096, the silvered compass dial with level and cross-bubble, upper and lower scales, the edge-bar needle with balance on jewelled pivot with clamp and cover, the compass box with twin axis, one side with micrometer fine dial indicating elevation, the needle operated by rack and pinion gear, the gimbal-mounted limb with lock and twin folding sights, on staff mounting with clamps, overall width -- 11 5/8in. (29.5cm.)
See Colour Plate 7
by John Davis & Son Darby Ltd., No. 4096, the silvered compass dial with level and cross-bubble, upper and lower scales, the edge-bar needle with balance on jewelled pivot with clamp and cover, the compass box with twin axis, one side with micrometer fine dial indicating elevation, the needle operated by rack and pinion gear, the gimbal-mounted limb with lock and twin folding sights, on staff mounting with clamps, overall width -- 11 5/8in. (29.5cm.)
See Colour Plate 7