The clock uses an idler wheel to move the hour ring so it doesn’t need a separate hour hand. After he built his first design, [wyojustin] realized he could add a planetary gear that could move ...

A technological innovation could revolutionize the precision of navigation systems. A tiny device, shaped like a comb, ...

The Hollow Clock has no face, just an open space with ... A concealed shaft and gear assembly takes care of that. For every full rotation of the minute hand (actually the white ring), the hour ...