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Apian, Peter, 1495-1552. Astronomicum Caesareum, 1540.
*GC5.Ap34.540a
Houghton Library, Harvard University
This more complex volvelle has multiple moving parts, including several outer dials, with a smaller, independently rotating disk inside. Click here for a larger version of this image than Tumblr file sizes permit.

Apian, Peter, 1495-1552. Astronomicum Caesareum, 1540.

*GC5.Ap34.540a

Houghton Library, Harvard University

This more complex volvelle has multiple moving parts, including several outer dials, with a smaller, independently rotating disk inside. Click here for a larger version of this image than Tumblr file sizes permit.

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