Vintage “MATSKI” Slide Rule Round KL-1 Original Box `67s SSSR Vintage

Vintage Logorhythm Ruler Round Kl-1 in original packaging with instructions (in Russian) SSSR-USSR.

Made in SSSR 1967

Original Circular Algorithm Computer in Mint Condition and in its own cardboard box.

The ruler itself is in MINT condition, but the box is in GOOD condition.

Box has taken on everything that has happened during the last almost 6 decades.

The instruction is in the Box and it is in Russian

RUSSIAN CIRCULAR SLIDE RULE (model KL-1) 

50 millimeters in diameter, The KL-1 is intended for 

performing trigonometric and mathematical operations: 

1. Multiplication 

2. Division 

3. Squaring 

4. Extraction of a square root. 

5. Finding of trigonometric functions of a sine 

6. Finding of trigonometric functions of a tangent 

7. Finding inverse trigonometric functions. 

8. Calculation of the area of a circle. 

The circular slide rule consists of: 

• Housing with two knobs, 

• 2 dials (one of which revolves with the aid of the black 

knob), 

• 2 pointers (which revolve in unison with the aid of the 

red knob), and a fixed indicator. 

• The fixed indicator is on side 2, directly aligned with the 

black knob 

SIDE 1 : 3 scales on the fixed dial. 

1. The outer scale - for basic calculating. It is the inverse 

of the inner moveable scale on side 1 (equivalent to a 

DI scale); 

2. The middle scale S - for calculating the sines of angles; 

3. The inner scale T - for calculating the tangents of 

angles. 

SIDE 2: 2 scales on the moveable dial. 

1. The outer scale - the scale of the squares (equivalent to 

an A scale); 

2. The inner scale -for basic calculating

 MULTIPLICATION

(using the moveable internal scale, fixed 

indicator, and moveable pointer on side 2) 

1. Rotate the black knob (2) to position the 

index (of the inner moveable scale) under 

the fixed indicator (5). 

2. Rotate the red knob (3) to position the 

moveable pointer over the first cofactor (on 

the inner moveable scale). 

3. Rotate the black knob to position the second 

cofactor (on the inner moveable scale) under 

the fixed indicator. 

4. Read the product under the moveable 

pointer (on the inner moveable scale). 

DIVISION

(using the moveable inner scale, fixed indicator, 

and moveable pointer on side 2) 

1. Rotate the black knob to position the 

dividend (on the inner moveable scale) 

under the fixed indicator. 

2. Rotate the red knob to position the moveable 

pointer over the divisor/denominator (on the 

inner moveable scale). 

3. Rotate the black knob to position the index 

(on the inner moveable scale) under the 

moveable pointer. 

4. Read the quotient under the fixed indicator 

(on the inner moveable scale). 

SQUARING

(using both the inner and outer moveable scales, 

the fixed indicator, and the moveable pointer on 

side 2) 

1. Rotate the black knob to position the root 

number (on the inner moveable scale) under 

the fixed indicator. 

2. Under the same indicator, read the square of 

the root number on the external moveable 

scale. 

THE EXTRACTION OF SQUARE ROOT

(using both the inner and outer moveable scales, 

the fixed indicator, and the moveable pointer on 

side 2) 

1. Rotate the black knob to position the 

radicand (the squared number) (on the 

external moveable scale) under the fixed 

indicator. 

2. Under the same fixed indicator, read the 

square root of the radicand on the internal 

moveable scale. 

FINDING TRIGONOMETRIC FUNCTIONS 

OF ANGLE

(using the fixed scales and the moveable pointer 

on side 1) 

1. Rotate the red knob to position the pointer 

over the angle in question. 

Use the inner spiral "T" scale for tangents or 

the middle "S" scale for sine's. 

2. Under the same pointer, read the function of 

the angle on the fixed outer scale. 

FINDING INVERSE TRIGONOMETRY 

FUNCTIONS

(using the fixed scales and the moveable pointer 

on side 1) 

1. Rotate the red knob to position the pointer 

over the value of the trig function (on the 

outer fixed scale). 

2. Under the same pointer, read the angle (on 

the T or S scale) corresponding to the 

function. 

CALCULATION OF THE AREA OF 

CIRCLE

(using the inner and outer moveable scales, 

moveable pointer, and fixed indicator on side 2) 

1. Rotate the black knob to position the "C" on 

the inner moveable scale under the fixed 

pointer. 

2. Rotate the red knob to position the moveable 

pointer over the diameter (on the inner 

moveable scale) of the circle in question. 

3. Rotate the black knob to position the index 

of the outer moveable dial under the fixed 

indicator. 

4. Under the moveable pointer, read the area of 

the circle on the outer moveable scale. 

Carefully look at the photos and videos, fotos are  the best description of the product !!!

Look at the photos because they are part of the description.

Look at the photos and judge for yourself.

Dear customers

 In my offers, you will be able to find super-bulky items, old, rare and interesting items for collectors.

Old and used items have, more or less, traces on them during use.

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