These links describe a variety of horological tools, original precision pendulum clocks, and experiments with clocks and timekeeping.

The state of the art in electronic clock timing devices A tool to index wheel blanks for any tooth count Custom clocks in fine wooden cases

Two nearby pendulums will affect each other

Measuring the accuracy of AC line powered clocks

The Hector Mine earthquake affected clocks from California to New Jersey

An analysis of the rate and a way to improve it

Links to some other horological web sites