Drawing Instrument, Triangulator


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.

Date Made: ca 19431943

Maker: Abrams Instrument Corporation

Location: Currently not on view

Place Made: United States: Michigan, Lansing

Subject: MathematicsDrafting, Engineering


See more items in: Medicine and Science: Mathematics, Single Drawing Instruments, Science & Mathematics


Exhibition Location:

Credit Line: Gift of the University of Missouri - Columbia

Data Source: National Museum of American History

Id Number: MA.333632Catalog Number: 333632Accession Number: 300659

Object Name: drawing instrument

Physical Description: metal (parts material)wood (case material)paper (tag material)Measurements: overall: 8.7 cm x 44 cm x 19.4 cm; 3 7/16 in x 17 5/16 in x 7 5/8 in

Guid: http://n2t.net/ark:/65665/ng49ca746aa-aa31-704b-e053-15f76fa0b4fa

Record Id: nmah_1215091

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