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Measuring Instrument with Circular Dial

Measuring Instrument with Circular Dial

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Description
This brass instrument has a circular disc with a pointer in the middle , a glass cover with brass rim, and a brass handle. The glass cover may be removed from the dial..
The disc has two scales, the handle has one. One scale on the disc runs all the way around the outer edge from, 0 t0 60, divided four parts to a unit. The inner scale runs from 0 to 47 (not all the way around), also divided four parts to a unit.. The scale on the handle is divided to centimeters and subdivided to millimeters. A bar moves inside this scale. However, moving this does not seem to effect the dial or the pointer.
A mark on the dial reads: I Ф H B.
According to museum records, the object is French. It was acquired in 1965.
Location
Currently not on view
Object Name
Measuring Instrument
owner, prior
United States: New York, New York City
Physical Description
brass (overall material)
Measurements
overall: 1.8 cm x 9.1 cm x 18.7 cm; 23/32 in x 3 19/32 in x 7 3/8 in
ID Number
MA.326475
catalog number
326475
accession number
260032
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Data Source
National Museum of American History
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