7004-209 AERO INSTRUMENT CO Mark 2-B pelorus and drift sight. Designed to take bearings on objects or measure the angle between heading and the track of an airplane. Consists of a brass scope with bar that inserts into base with scales. Includes both the original instructions, very ragged, and a xerox copy. The instructions are labelled U.S. Navy and looks to date from WWII. In a fingerjointed wooden box with sliding lid. Good+ 60 - 120 (HSS333)