Apian, Cosmographicus, 1524 (H4r)

In the center of this complicated volvelle, you can see the thread used to attach the moving parts to the page; on the verso of this leaf you can see how the thread is tied off.

In the center of this complicated volvelle, you can see the thread used to attach the moving parts to the page; in this picture you can see the other side of this leaf and thread.

open image or download from source: Smithsonian

Peter Apian, Cosmographicus. Landshut: Johann Weyssenburger, 1524. (sig. H4r)

Smithsonian Libraries, Dibner GA6 .A4X (public domain)

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