Cylindrical slide rule

A slide rule using a cylindrical configuration to allow several feet of rule to be included in an instrument only a few inches long. The one shown was made about 1900. It is twenty inches long and can give four-or-five-place computational accuracy.

References in periodicals archive

Wider interest in the slide rule was awakened about 1881, when Edwin Thacher, a bridge engineer, patented a cylindrical slide rule, and Robert Riddell published his book, The Slide Rule Simplified.

Calculators before the CPU

The Loga cylinder slide rule (a relative of the large cylindrical slide rule invented by Edwin Thacher in 1881) garnered the highest price - $863.

The slide rule today: respect for the past

I have heard stories about round slide rules in Russia, pocket slide rules in Serbia, and even cylindrical slide rules from the 1800s, which was well before my time, I assure you.

State of the society address: adapt today to shape tomorrow

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