Click image to enlarge.

Octant

Catalogue number:
EM*331882

Inscriptions:
"Spencer, Browning & C^o London. Made for D. M^cGregor & C^o Glasgow & Greenock"

Dimensions:
radius 9 inches

Discussion:
This has an ebony frame, a reinforced brass index arm, an ivory scale that is graduated every 20' from -2^o to +107^o and read by vernier with tangent screw to 30" of arc. Western Union transferred it to the Smithsonian in 1972.

Further Information:

Spencer, Browning & Co.
Octant