Vintage Soviet Wood Logarithmic Slide Ruler in Case Calculator USSR RARE 1966
Description
- Lenght of ruler: 25 cm / 9.84 inches
- Material of ruler: wood and plastic
- Manufacturer: USSR
- Condition: used, as in photos
- Date of manufacture: 1966
You can look all details at the original photos. Please contact us and we help you select rulers and send additional photos.
Logarithmic ruler, counting ruler-an analog computing device that allows you to perform several mathematical operations, including multiplication and division of numbers, exponentiation (most often in square and cube), calculation of square and cubic roots, calculation of logarithms, potentiation, calculation of trigonometric and hyperbolic functions, and some other operations.
Before the advent of pocket calculators, this tool served as an indispensable calculation tool for an engineer. The accuracy of the calculations is about 3 significant digits.
Payment
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Shipping
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