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.
1001 Words and Phrases You Never Knew You Didn’t Know by W.R. Runyan Copyright © 2011 by W.R. Runyan