Russian Circular Slide Rule

Russian Circular Slide Rule

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Usage conditions apply
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.
Currently not on view
Object Name
slide rule
date made
place made
Soviet Union
Physical Description
metal (edge, knobs material)
glass (coverpieces material)
paper (box, instructions material)
plastic (pointers material)
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
accession number
catalog number
Credit Line
Gift of Laszlo Kutor
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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