A slide rule is an analog computing device that allows you to perform several mathematical operations, including multiplying and dividing numbers, exponentiation (most often squaring and cube), calculating square and cube roots, calculating logarithms, potentiating, calculating trigonometric and hyperbolic functions, and some other operations. If you break the calculation into three steps, then using a slide rule you can raise numbers to any real power and extract the root of any real power.

Rulers produced in the USSR had an additional centimeter scale at the beveled edge, just like a regular ruler. The standard ruler had a length of 30 cm, which was convenient for geometric work in A4 format, and the slide rule had a length of 25 cm.

Such computing devices were created not only for engineers, but were specialized: a navigational ruler, an artillery ruler, a navigation ruler.

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