These links describe a variety of horological tools, original precision pendulum clocks, and experiments with clocks and timekeeping.
MicroSet Clock and Watch Timer
An electronic tool for measuring and studying clocks and watches
Original Electromagnetic Clocks
Custom clocks in fine wooden cases
A clock that keeps star time
A clock with one hand that takes a year to go around
See How Two Clocks Interact With Each Other
Two nearby pendulums will affect each other
How accurate is 60 cycle house current?
Measuring the accuracy of AC line poweredclocks
See the effect of an earthquake on a clock
The Hector Mine earthquake affected clocks from California to New Jersey
Observations of the Eureka battery clock
An analysis of the rate and a way to improve it