$492
H. Hemsley 12-inch Ebony Octant, 19th century, London, brass index arm with bone vernier scale from 0-20 with thumbscrew lock, arc reading 0-95, cross-arm bone boss reading as above, sighting pinnula, horizon mirror, and sunshades, small bone note plaque on rear, housed in a fitted mahogany case.
Auctioneer:
Skinner
Date:
2015-04-25