Riefler Prescision Regulator Clock

This pendulum clock served as the first time standard in the United States, from 1904 to 1929. It achieved accuracies of 10 milliseconds per day, and were guaranteed to be at least within 30 milliseconds. By including a low thermal expansion pendulum, a low pressure tank, and a gravity remontoire, the error on the pendulum swing was reduced.

Dover Castle Clock

Dating from c. 1600, this is one of the few remaining clocks in the world that still feature ts original Verge and Foliet escapements. It has been moved and restored, and is now on exhibit in the Science Museum, London.

Da Vinci's "Clock at Chiaravalle"

One of Leonardo da Vinci's Clock designs was created and put on display in Chiaravalle, Marches, Italy. It includes three dials, or 'clock faces:' one for minutes, one for hours, and one to keep track of lunar phases. Although clocks that keep track of seconds were not invented after pendulums were introduced to clockwork, after the life of da Vinci, he created arguably the most accurate clocks in his time.