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.

Date Made: ca 1943ca 1944

Maker: Felsenthal Instrument Co.Felsenthal Instrument Co.

Location: Currently not on view

Subject: Mathematics

Subject:

See more items in: Medicine and Science: Mathematics, Military, Science & Mathematics, Measuring & Mapping

Exhibition:

Exhibition Location:

Credit Line: Gift of Ben Wharton Rau and Margery Felsenthal Rau

Data Source: National Museum of American History

Id Number: 1977.1141.15Catalog Number: 336399Accession Number: 1977.1141

Object Name: Calculating Disc

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

Guid: http://n2t.net/ark:/65665/ng49ca746aa-913c-704b-e053-15f76fa0b4fa

Record Id: nmah_1213902

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