Keisan Dokei

Appearance:        Adaptation of shaku-dokei movement mounted on desk standing base.

Period:                 Post-Edo.

Keisan 1

Escapement:       Usually verge and balance wheel.

Power Source:     Spring.


Construction:      Along with inro-dokei, a new clock appeared called the keisan-dokei which resembled the shaku-dokei but used a mainspring instead of a weight to power the clock.  As they were used on tables and desks they were often referred to as paperweight clocks and also as ‘Doctor’ clocks as they were very popular with doctors.

Example: From the John Read Collection.