Escpaments: the various kinds
Galileo Escapement Verge Escapement Cross-beat Escapement Anchor Escapement Deadbeat Escapement crown wheel with deadbeat Pin wheel Escapement Detent Escapement Side Oscillating Escapement Cylinder Escapement Duplex Escapement Lever Escapement Grasshopper Escapement: spring, twin and single pivot Gravity Escapement Co-axial Escapement Constant Escapement Sources Escapments — http://chestofbooks.com/crafts/scientific-american/Scientific-American-Reference-Book/Escapements.html#.U5YtLBZfTCg Wikipedia Escapments — http://en.wikipedia.org/wiki/Escapement