Finding inverse trigonometric functions (of sines and tangents). Calculation of the area of a circle. The logarithmic rule consists of the body with two knobs, two clock faces, one of which is going round by means of a knob with black point, and two arrows going round by means of a knob with red point. The rule is in good working condition.
Ready to accept the best offer. The item "Russian USSR Logarithmic Mathematical Circular Slide Rule KL-1" is in sale since Thursday, August 27, 2020. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Engineering\Slide Rules". The seller is "ussr-odessa" and is located in Odessa. This item can be shipped worldwide.