The compartments of the wooden case for this instrument include two lenses mounted stereoscopically on a metal handle that attaches to a metal base. They also hold two lights with an electrical cord. These may be mounted over the rod that holds the lenses. Other parts include:
1. A rod with two gauges on it, as well as 2 glass pieces. Both gauges run from -50 to 0 to +50. This is the measuring unit.
2. A pencil arm.
3. A double point, one of which has a lead in it.
4. A sliding clamp.
5. A plastic container with several leads.
6. A paper tag giving the serial number and manufacturer's name. This tag reads in part: Serial No. 327. It also readst: Date AUG 23 1943. It also reads: ABRAMS INSTRUMENT CO. (/) LANSING, MICHIGAN, U.S.A.
An alignment mechanism and a photogrammetric computer, shown as part of the instrument, are not in the present apparatus.
For a related object, see MA.333632.
Reference:
Talbert Abrams, Essentials of Aerial Surveying and Photo Interpretation, New York: McGraw-Hill, 1944.
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