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| Dr. John Kirk's web site deticated to his love of watches and devising highly accurate gear trains for representing astronomical or other phenomena for horological purposes. | |
| One of the clocks described in it is called W5. If the Lissajous figure at the top of this page animates, take a look at the animation of W5's Double Gravity Escapement. | |
| Article from the Horological Journal of the W5 Free Pendulum Clock. | |
