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Russian Circular Slide Rule

Russian Circular Slide Rule

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Description
This circular slide rule is the size of a pocket watch. It has a metal band around the edge and glass cover on the front and back. Each side of the rule has a pointer pivoted at the center, with its motion controlled by a knob along the edge. On one side, the outer edge is divided logarithmically from 1 to 100 and the inner edge from 1 to 10. Rotating the pivot allows one to find squares and square roots of numbers. The other side has a spiral scale on the inside that runs from 1 to 54 and appears to allow one to find tangents on the outer edge. It appears to have a scale of sines on the outside. The marks are in Russian.
A paper sheet of instructions accompanies the slide rule. The rule fits in a cardboard box.
Location
Currently not on view
Object Name
slide rule
date made
1967
place made
Soviet Union
Physical Description
metal (edge, knobs material)
glass (coverpieces material)
paper (box, instructions material)
plastic (pointers material)
Measurements
overall: 2.1 cm x 5.7 cm x 6 cm; 13/16 in x 2 1/4 in x 2 3/8 in
ID Number
2014.0136.01
accession number
2014.0136
catalog number
2014.0136.01
Credit Line
Gift of Laszlo Kutor
subject
Mathematics
Rule, Calculating
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Arithmetic Teaching
Slide Rules
Data Source
National Museum of American History
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