Compass in Case

Description
This six-inch German silver instrument opens into a double "V" shape. It has a cylindrical handle, thumbscrews for removing the point attachments, and thumbscrews for adjusting the points. The legs may be fitted with any combination of a needle point, two lengthening bars, a pencil point, and a pen point. The second needle point is missing. The lengthening bars extend the compass horizontally to a width of 9-3/4", allowing the instrument to function as a beam compass.
Almost all of the pieces are engraved with the number 60, except for the pen point and one lengthening bar, which are each engraved with the number 61. It is possible that some of the pieces have gotten mixed up with those catalogued with 1978.2110.04. A wooden case is covered with burgundy-colored leather and lined with black velvet.
Location
Currently not on view
Object Name
compass
compass, drawing
date made
early 20th century
Physical Description
leather (overall material)
steel (overall material)
wood (overall material)
german silver (overall material)
velvet (overall material)
Measurements
overall: 17.7 cm x 10 cm x 2 cm; 6 31/32 in x 3 15/16 in x 25/32 in
place made
Germany
ID Number
1978.2110.05
accession number
1978.2110
catalog number
336731
subject
Science & Mathematics
Mathematics
Drawing Instruments
Dividers and Compasses
See more items in
Medicine and Science: Mathematics
Dividers and Compasses
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Ruth A. Ming
Additional Media

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