Related Object Info
octant
This brass octant is a superbly engraved, precision instrument with elegant, curving cross braces that serve as both handle and structural support for the frame.
The limb is divided from -5° to 95° every 1° and is subdivided every 20'. The vernier on the index arm reads the scale to 1'. There is a front pinhole sight and back pinhole sight. The front one has two holes with a rotating cover. There are two shades, one red and the other darker red. The shades can be moved to another slot for use by the back sight. The half-silvered horizon glass has wingnuts and tightening screws on the back of the frame and fine adjustment screws on the front. The back sight has similar adjustment screws.
There is a small loose brass scope with brass and ivory holder, visible in upper right corner of two B&W photos, still in storage.
The back of the frame has three feet made of knurled knobs.