overall: 2.1 cm x 5.7 cm x 6 cm; 13/16 in x 2 1/4 in x 2 3/8 in
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.