This instrument supplies a grid of lines for measuring photographs. The fitted compartments of the wooden case hold a socket wrench, an open end wrench, brass pin guides in two sizes, brass nuts, brass bolts, pins, and arms with slots down the middle and a hole at each end that may be joined together by nuts and bolts. These arms are made in three different lengths.
A paper tag reads in part: Serial No. 227. It also reads in part: Date SEP 28 1943. It also reads: ABRAMS INSTRUMENT CO. (/) LANSING, MICHIGAN, U.S.A.
For a related object, see MA.336631.
Talbert Abrams, Essentials of Aerial Surveying and Photo Interpretation, New York: McGraw-Hill, 1944, pp. 218-244.
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