Sperti, Inc. Astro Compass

Description
At high latitudes, where magnetic variation can be erratic and the angle of magnetic dip can be steep, the magnetic compass is essentially useless. This instrument, on the other hand, indicates true north when pointed at a known star. It was made for military use during World War II, and surplussed soon thereafter.
The inscription reads "ASTRO-COMPASS MK II MANUFACTURER'S ASSEMBLY PART NO. D500 CONTRACT NO. W535-AC 36492 SPERTI, INC. CINCINNATI, OHIO, USA."
Ref.: Sperti, Inc., Instructions for Use of the Astro Compass MK. II (Cincinnati, n.d.).
Location
Currently not on view
maker
Sperti, Inc.
Measurements
overall: 15 1/2 in; 39.37 cm
overall: 10 in x 5 in x 6 in; 25.4 cm x 12.7 cm x 15.24 cm
ID Number
1983.0548.09
catalog number
1983.0548.09
accession number
1983.0548
Credit Line
Conrad S. Ham
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Data Source
National Museum of American History, Kenneth E. Behring Center

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