Westminster Clock
The winding up of the going part of the great clock at Westminster, London, takes ten minutes, the weight of the pendulum being six hundred and eighty pounds; but the winding up of the striking parts—the quarter part and the hour part—takes five hours each, and this has to be done twice a week. The contract cost of winding up the clock is $500 a year. The error of the clock amounts to only about one second for eighty-three days in the year, and there is probably no other clock in the world of which the same can be said.