
The Longcase Clock, or Grandfather Clock as it is better known, was probably first produced in the UK in the second half of the 17th century. It is believed that longcases were developed to encase the weights of the earlier Lantern wall clock. The first clocks were single handed, of 30 hour duration, but in 1675 the more accurate, longer duration 8-day movement became fashionable with the introduction of a longer one-second pendulum.