Sperti, Inc. Astro Compass

Sperti, Inc. Astro Compass

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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
Object Name
astro compass
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

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Comments

I picked up an Astrograph Box, Type A1 at Lydiate Classic Car Show on Merseyside, England on Sunday. Spec No is 27404 . No contents obviously but what a well made box , I will treasure it. I was showing a Ford popular 103e made in Dagenham in 1959.
Steve- I bought a Sperti Astro-Compass at a garage (boot) sale for $3.00 when I was 12. Didn't know what it was, just thought it was neat. Alas, I have the opposite of your problem: I have no box!

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