Octant, possibly made by Isaac Greenwood

octant

INSTRUMENTS - OCTANTS
Greenwood, Isaac
USA, NY, New York
circa 1840
wood, metal
LOA 17-1/4 x WOA 14-1/8 x H. 3 in.

Octant; ebony frame, ivory scale, vernier, name plate (blank), note pad on back, and pencil finial; flat brass index arm; scale -5° to 95° divided by 1°, subdivided by 20'; adjustable brass index mirror with 3 shades; horizon glass with double peep sight vane; single peep back sight; back horizon glass; with box 2006.15.4, which has Isaac Greenwood label.

2006.15.3