Circular slide rule


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Circular slide rule

A slide rule comprised of two thin plastic disks and a cursor, all attached to each other coaxially in a manner that allows them to be rotated independently. The bottom disk is larger than the top one and the various slide rule scales are printed near the peripheries of the two disks.
References in periodicals archive ?
Another interesting geek gewgaw offered was an early version (1843) of the first circular slide rule made in America--something called a Palmer's Computing Scale.
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'.
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.