Details
BATE, London
A brass mining dial, with cover engraved with scales for Diff of Hypo & Base, silvered dial, edge-bar needle, clamp, removeable sights and staff mounting, in fitted wood case -- 8¼in.(21cm.) wide
A brass mining dial, with cover engraved with scales for Diff of Hypo & Base, silvered dial, edge-bar needle, clamp, removeable sights and staff mounting, in fitted wood case -- 8¼in.(21cm.) wide
Further details
See illustration