Drawing Instrument, Abrams Contour Finder

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Description
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.
Location
Currently not on view
date made
1943
maker
Abrams Instrument Corporation
place made
United States: Michigan, Lansing
Physical Description
wood (case material)
cloth (liner material)
rubber (cord material)
glass (lenses material)
metal (rods, smaller cases, circuitry material)
paper (tag material)
plastic (covers material)
Measurements
overall: 7.4 cm x 45.8 cm x 16.6 cm; 2 29/32 in x 18 1/32 in x 6 17/32 in
ID Number
MA.333631
catalog number
333631
accession number
300659
Credit Line
Gift of The University of Missouri - Columbia
subject
Mathematics
Drafting, Engineering
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Single Drawing Instruments
Data Source
National Museum of American History, Kenneth E. Behring Center

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