free pendulum

Shortt-Synchronome clock, a free pendulum clock, patented in 1921.

In 1929 it switched to the Shortt-Synchronome free pendulum clock before phasing in quartz standards in the 1930s.

The most accurate commercially produced pendulum clock was the Shortt-Synchronome free pendulum clock, invented in 1921.

In the 20th century, W.H. Shortt invented a free pendulum clock/Shortt-Synchronome clock with an accuracy of one-hundredth of a second per day.

The gravity arm then pushes on the free pendulum, which releases it to drop out of engagement at a time that is set entirely by the free pendulum.

The most accurate commercially produced mechanical clock was the Shortt-Synchronome free pendulum clock invented by W. H. Shortt in 1921, which had an uncertainty of about 1 second per year.

In the 20th century William Hamilton Shortt invented a free pendulum clock, patented in September 1921 and manufactured by the Synchronome Company, with an accuracy of one hundredth of a second a day.

It is similar to the slave of a Shortt-Synchronome free pendulum system, and was in fact originally synchronised to another controlling pendulum which was then in the basement, but is now in the Lord Mayor's Conference Room.

The Shortt-Synchronome free pendulum clock was a complex precision electromechanical pendulum clock invented in 1921 by British railway engineer William Hamilton Shortt in collaboration with horologist Frank Hope-Jones, and manufactured by the Synchronome Co., Ltd. of London, UK.