Vintage KL-1 circular slide rule USSR calculator mathematical soviet instrument for Sale

On eBay Now...

Vintage KL-1 circular slide rule USSR calculator mathematical soviet instrument For Sale

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Vintage KL-1 circular slide rule USSR calculator mathematical soviet instrument:
$69.99

Thank you for visiting my store page.
I offer you this watch
Vintage USSR slide rule 1960s calculator mathematicalsoviet original instrumentRULER CIRCULAR LOGARITHMIC KL-1
This is an iconic calculating instrument that has served
humanity faithfully for many years. The computing tool was important and necessary until the advent of calculators and personal computers.Now in the school curriculum there is no course for studying the slide rule, except that the mention of it
in the context of the history of computing. An easy-to-use slide rule helped with complex calculations
The basis for the invention of the counting ruler was the discovery of logarithms. Yes, the principle of the slide rule is based on the fact that the multiplication and division of numbers is replaced by the addition and subtraction of their logarithms.KL-1 was released in 1960s. «KL-1» is intended for implementation most of often meetings in practice mathematical operations:
- Multiplication
- Division
- Extraction of a square root
- Squaring
- Finding of trigonometric functions of a sine 9. Conversion values, such as currencies, distances, weight.
- Finding of trigonometric functions of a tangent
- Finding inverse trigonometric functions (of sines and tangents)
- Calculation of the area of a circle.
Description:
- analog dial
- Crown Diameter: 2.16" (55 mm)
- Case diameter without crown: 1.96" (50 mm)
- Dial: 1.81" (46 mm) (there is a small scratch on the glass)
- Thickness: 0.59" (15 mm)The 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.
There are 3 scales on the fixed dial on side 1:
• The outer scale- for basic calculating. It is the inverse of the inner moveable scale on side 1 (equivalent to a DI scale);
• The middle scale S- for calculating the sines of angles;
• The inner scale T- for calculating the tangents of angles.
There are 2 scales on the moveable dial on side 2:
• The outer scale - the scale of the squares (equivalent to an A scale);
• The inner scale -for basic calculating (equivalent to a C scale).
Mathematical calculations on the KL-1 slide rule are performed as follows:*MULTIPLICATION
(using the moveable internal scale, fixed indicator, and moveable pointer on side 2)
• Rotate the black knob (2) to position the index (of the inner moveable scale) under the fixed indicator (5).
• Rotate the red knob (3) to position the moveable pointer over the first cofactor (on the inner moveable scale).
• Rotate the black knob to position the second cofactor (on the inner moveable scale) under the fixed indicator.
• 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)
• Rotate the black knob to position the dividend (on the inner moveable scale) under the fixed indicator.
• Rotate the red knob to position the moveable pointer over the divisor/denominator (on the inner moveable scale).
• Rotate the black knob to position the index (on the inner moveable scale) under the moveable pointer.
• 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)
• Rotate the black knob to position the root number (on the inner moveable scale) under the fixed indicator.
• 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)
• Rotate the black knob to position the radicand (the squared number) (on the external moveable scale) under the fixed indicator.
• 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)
• 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 sines.
• 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)
• Rotate the red knob to position the pointer over the value of the trig function (on the outer fixed scale).
• Under the same pointer, read the angle (on the T or S scale) correThe is used.
Cosmetic condition: see photos,some shades in thephotograph may differ from actual
Additional photos can be sent
You can ask me questions before buying, I try toanswer quickly.
Shipping – 9$ (worldwide) 9-22days
Send the next day after payment. Send the track code.
I combine items, so you can save on shipping byordering two or more lots.
Items are well packed.
I'm glad that you are interested in lots that I sell.
Wish you a good shopping.