1) Analog computer 2) Astronomical instrument
Found on
https://www.crosswordclues.com/clue/volvelle
A volvelle or wheel chart is a type of slide chart, a paper construction with rotating parts. It is considered an early example of a paper analog computer. Volvelles have been produced to accommodate organization and calculation in many diverse subjects. Early examples of volvelles are found in the pages of astronomy books. They can be traced back...
Found on
http://en.wikipedia.org/wiki/Volvelle
instrument like an astrolabe used by doctors for astrology
Found on
http://phrontistery.info/v.html
No exact match found.
