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circular slide rule

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circular slide rule

[′sər·kyə·lər ′slīd ‚rül]
(mathematics)
A slide rule in a circular form whose advantages over a straight slide rule are its precision, because it is equivalent to a straight slide rule many times longer than the circular slide rule's diameter, and ease of multiplication, because the scale is continuous.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
It was in 1844 that Aaron Palmer's Computing Scale, an 8-inch diameter circular slide rule, appeared in Boston, followed by a pocket version.
Calculators before the CPU
The Skyracer also boasts an official chronometer-certified by the COSC and is self-winding with high-frequency (28,800 vibrations per hour), 38 jewels, 1/4th of a second chronograph, 12-hour totalisers, calendar, water-resistant to 200 metres/20 bars (660 ft), screw-locked crown, bi-directional pinion bezel, circular slide rule, sapphire crystal and glare-proofed on both sides.
Special series of watches in stores
"On the set of Doctors and Nurses there were these kind of circular slide rule things where you had to put in your weight and your height and it told you what weight category you were in - it told me I was `pre-obese'.
Me & My Health
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