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 ?
If you've never used a whiz wheel, it has two main parts: a circular slide rule side for making quick airspeed and density altitude calculations (to name two), plus a wind side for computing groundspeed and wind correction angle.
Numbers proliferated with those to the point S&W issued a circular slide rule to help dealers ID them.
Oughtred also created "Circles of Proportions," the archetype of the circular slide rule.