volvelle

In the twentieth century, the volvelle had many diverse uses.

The idea of including a volvelle, based on crop rotation charts, was initially Page's concept.

This post also has a slot to receive a wedge for securing the moving parts of a volvelle.

A circular slide chart is sometimes referred to as a wheel chart or Volvelle.

The chapter ring position is moved in a N-S direction from a calendar volvelle on the under side.

A volvelle or wheel chart is a type of slide chart, a paper construction with rotating parts.

Some Symmes dials included a volvelle.

The most ancient example of a simple volvelle was the pentagram from Hammurabi's day that has become the symbol of witchcraft.

The lunar volvelle is a working instrument in its own right, one of four different printed paper instruments which accompany Regiomontanus's astronomical calendars.

They used a volvelle, a rotating calendar, to calculate the moon's position as well as multiple almanacs which described different phases of the moon.

Chen has also worked with the volvelle or wheel chart, which is a set of stacked paper disks of varying sizes, sometimes with windows.

Behind the front cover was a rotatable laminated card disc, or volvelle, covered with more images, including photos of the band members, which showed through holes in the cover.

The rock band Led Zeppelin employed a volvelle in the sleeve design for the album Led Zeppelin III (1970).

They can be traced back to "certain Arabic treatises on humoral medicine" and to the Persian astronomer, Abu Rayhan Biruni (c. 1000), who made important contributions to the development of the volvelle.

It is speculated that the Catalan mystic and poet Ramon Llull, of Majorca, also used volvelles to illustrate his theories in the early 14th century, but no physical example of a paper volvelle created by him has ever been documented.