Calculating Disc, Sherrill Compass Deviation Calculator, Felsenthal FAO-2

Description
According to marks on this small plastic instrument, it was “furnished” by the Sherrill Research Corporation of Peru, Indiana, and copyrighted in 1944. At that time, Sherrill was making compasses for the U.S. military and sold this calculator to easily correct compass readings. Instructions are on it.
According to a tag received with the object, Felsenthal made the instrument for the U.S. Army as the FAO-2 and sold it in 1943.
Location
Currently not on view
date made
ca 1943
ca 1944
maker
Felsenthal Instrument Co.
Felsenthal Instrument Co.
Physical Description
plastic (overall material)
Measurements
overall: .1 cm x 8.5 cm x 11.4 cm; 1/32 in x 3 11/32 in x 4 1/2 in
ID Number
1977.1141.15
catalog number
336399
accession number
1977.1141
Credit Line
Gift of Ben Wharton Rau and Margery Felsenthal Rau
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Measuring & Mapping
Military
Data Source
National Museum of American History, Kenneth E. Behring Center

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