USSR round slide rule Anniversary 50th of the October revolution 1967

Description

USSR round slide rule Anniversary 50th of the October revolution 1967
This line was made in 1967 in honor of the 50th anniversary of the October Revolution, Moscow, USSR.The product has a leather case, on the front side of which there is an embossing "Moscow-city of a hero".
The circular slide rule "KL-1" is designed to perform the most common mathematical operations in practice: multiplication, division, combined operations, raising to a cladrate, extracting a square root, finding the trigonometric functions of sine and tangent, as well as the corresponding inverse trigonometric functions, calculating the area circle.
The slide rule consists of a case with two heads, 2 dials, one of which rotates with a head with a black dot, and 2 hands that rotate with a head with a red dot. There is a fixed pointer opposite the head with a black dot above the movable dial.
On the movable dial there are 2 scales: internal - main - counting and external - scale of squares of numbers.
There are 3 scales on the fixed dial: the outer scale is counting, similar to the inner scale on the movable dial, the middle scale of the “S”-values ​​of angles for reading their sines and the inner scale of “T”-values ​​of angles for reading their tangents.
ATTENTION! Pulling heads out of the housing is not allowed.
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