Ainsworth Brunton Pocket Transit

Description
This is a standard Brunton Pocket Transit that, despite the "LIETZ 8026-51" signature, was probably made by Ainsworth, and likely dates from the third quarter of the 20th century. The U. S. National Imagery and Mapping Agency transferred it to the Smithsonian in 2000.
This compass has a folding sight at north. The lid, hinged at south and provided with a sight line and small hole, serves as the second sight. Since the lid is mirrored, the user can read the needle while sighting a distant object. The needle ring is graduated to degrees. The western half of the face is graduated in degrees, in quadrants from west, and provided with a clinometer for use when the instrument is horizontal, and a straight level for use when the instrument is vertical. Because the sides of the case are flat, the instrument can be set up vertically when used for vertical angles. There are also a metal tripod and a leather carrying case.
Location
Currently not on view
date made
ca 1950-1975
dealer
Lietz, Adolph
maker
Ainsworth, William
Measurements
overall: 1 1/4 in x 2 3/4 in x 2 3/4 in; 3.175 cm x 6.985 cm x 6.985 cm
ID Number
2000.0257.14
accession number
2000.0257
catalog number
2000.0257.14
Credit Line
United States National Imagery and Mapping Agency
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

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