Diagrams of the Riefler Precision Clock
Illustrations from:
Time & Timekeepers
by Willis I. Milham, 1923
Riefler patents:
- D.R.P. 50739 Riefler "free" pendulum escapement
- D.R.P. 60059 Mercury compensation pendulum
- D.R.P. 100870 Nickel-steel alloy ("Invar") pendulum