Rare Logarithmic Mathematical Circular Slide Rule KL-1 Calculator 1917-1967 for Sale

Rare Logarithmic Mathematical Circular Slide Rule KL-1 Calculator 1917-1967 For Sale

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Rare Logarithmic Mathematical Circular Slide Rule KL-1 Calculator 1917-1967:
$90.00

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Rare AnniversaryUSSR Engineer Logarithmic Mathematical Circular Slide Rule KL-1 Calculator 1967.
Ruler in vintage working condition, have traces of age, stains, scratches , chips.
Circular logarithmic slide rule \"KL-1\" is intended for solving the most occurred mathematical operations. Calculations of circle square and finding of trigonometric functions of a sine. Finding of trigonometric functions of a tangent. 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.

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