Copper Rolling Ball Clock

タイトルまたは説明

Copper Rolling Ball Clock Dimension: *6X*1X*4.5cm. Clock diameter: *3cm. N.W.(kgs.): 3.1 Original: Made in the early *9th. century, France. This is a highly sophisticated two-hand clock placed on a sloping board at a **-degree angle. It is not spring-activated, but the movement of the clock as it rolls down the board engages the gear system and thus the pendulum. The clock's movement along the *5cm. long board takes a total of *4 hours. As a result, the clock has to be replaced at the top of the board once a day.