What is "cyclograph"

Cyclograph \Cy"clo*graph\ (s?"kl?-gr?f), n. [Cyclo- + -graph.] See Arcograph.

n. arcograph

A cyclograph (also known as an arcograph) is an instrument for drawing arcs of large diameter circles whose centres are inconveniently or inaccessibly located, one version of which was invented by Scottish architect and mathematician Peter Nicholson.