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.


Latitude: 38.921261200000
Longitude: -77.066520000000

Timeline of Events Associated with Riefler Prescision Regulator Clock

Date Event Manage

Riefler Prescision Regulator Clock

1656 to 1656

First Pendulum Clock

The first clock that utilizes the pendulum is attributed to Huygens in 1656. This increased the accuracy of clocks from 15 minutes per day to 15 secinds per day. This led to the development of the 'seconds pendulum' which became a standard 0.994-meter long pendulum used in all quality clocks.

The first pendulum clock, invented by Christiaan Huygens in 1656