This early Persian astrolabe with a geared calendar movement is the oldest geared machine in existence in a complete state. It illustrates an important stage in the development of the various complex astronomical machines from which the mechanical clock derives.
In Gear by *savageworlds I have plans to construct a weight-driven mechanical clock. These preliminary gear designs are to find out which patterns are both mechanically sound and aesthetically pleasing. Ranging in size from about 1 inch to 5 inches in diameter, they are laser-cut from 1/4 inch poplar. The final parts will likely be cut from baltic birch plywood to reduce warpage and weakness along the grain.