Pocket watches ... watch marked out for sundial use. [JGJMatt] explains how to do this with a variety of CNC, painting, or etching methods. He also explains how to use simple tools to generate ...

Curator Peggy Kidwell solves the mystery of a pocket sundial from the 1600s ... establish a vertical line). A magnetic compass is used to align the sundial. Around the outside rim of the compass ...

Sundial and compass with perpetual calendar and lunar circles. Brass, part silvered, 6 1/8 x 5 3/8-inches. By Christopher Kohler, Dresden, Germany, 1677. Glass of compass box cracked, compass needle ...