Brass gimbaled compass bowl with a transparent compass card (dial) under a glass plate over which is a fixed azimuth circle. The azimuth circle can be clamped; it has a black mirror and a bubble level. The dial can be illuminated from below by electric light bulb, fed from a vessel's power. A brass lid to cover the bowl. Wooden case with lift-off cover, brass latches and handles. Green felt lining. Instruction card with makers name stuck inside.
Inscription/Sig.
Signed on a brass plate on the side: Kelvin & Wilfred O White Vo. | Boston. Marked on the same plate: Bureau of Ships | U.S. Navy Standard Pelorus | 7-1/2 Inch Illuminated Dial | Mark III MDD. 1 Ser N 7217 | Contract No NXsx-99168 [the same text is found on a brass plate screwed to the outside of the box]
