1175 Buford Highway. Suite 120
Suwanee, Georgia. 30024
770.831.1257 - 1.800.438.6894

Date/Report Number …..12012010.LC-U78U72 Item: s 1960 RUSSIAN CIRCULAR  LOGARITHMIC SLIDE RULE  CALCULATOR
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Description of item VINTAGE 1960 RUSSIAN CIRCULAR  LOGARITHMIC SLIDE RULE  CALCULATOR IS 35 X 41 MM.   CONDITION WATCH  EXCELLENT FOR Advanced mathematical operations: multiplication; squaring; division; finding of trigonometric functions of a sine; extraction of a square root; finding of trigonometric functions of a tangent; Finding inverse trigonometric functions; calculation of the area of a circle, etc. 50 x 13.3 MM. THIS CIRCULAR SLIDE RULE OPERATES PERFECTLY. THE PATINA DIALS ARE NEAR MINT.   CONDITION EXCELLENT TO MINT.

Estimated Retail Replacement Value $399.00

Reports are supplied at the request of the customer and it is for the customer's exclusive use. Reports express an opinion of the time of the examination of the jewelry. This report is for customers use only for the following two purposes, indicating estimated retail replacement value to obtain insurance coverage, or for the purpose of providing geological information. goldsmith Works does not guarantee that the appraisal valuation will result in a sale at the price. Estimated retail replacement value is arrived after analyses of what the approximate high retail cash asking price is for labor, materials, and design. These prices may be substantially higher than actual transaction or warranty with regards to any item described in the report, since jewelry grading is not an exact science, this  report represent the best opinion of the company. GoldSmith Works is in no case responsible for differences that occur by repeated grading by other experts in the field and/or use of other standards, norms, methods or criteria other than those used by GoldSmith Works. GoldSmith Works is expressly held harmless by customers including, but with out limitation for any claims or actions that may arise out of negligence in connection with the preparation of this laboratory report, or actions based upon the customer's use of the report. The information on the carat weight, clarity grade, color grade on the report is approximate due to the limitations in jewelry grading. The item was tested, graded, and examined under 10x magnification using the techniques and equipment available to GoldSmith Works, including fully corrected triplet loupe, binocular microscope, master color comparison guides, diamond color comparison tools, electronic carat balance, non-contact optical measuring device, and ancillary instruments necessary at the time of Exam






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A Russian circular slide rule built like a pocket watch
that works as single cursor slide rule since the two
needles are ganged together.


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(model KL-1)
1958-67 Russian mechanical logarithmic slide rule calculator.
The KL-1 is intended forperforming 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.

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Tochmach KL1Russian built Circular slide rule with a design similar to a pocket watch with both front and rear scales.

Two pointers move in sync by rotating the red knob, and the the C scale face turns by rotating the black knob.

CALCULATIONS that can be performed are:

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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

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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.

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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
(equivalent to a C scale)

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