Common Clock Escapements: A Description of Common Escapements and Practical Workshop Methods for Mechanical Clocks Ancient and Modern by Laurence W Penman, Laurie Penman (Paperback / softback, 2013)

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Linking the pallet arbor centre to the tip of the tooth that is about to be touched by the pallet, from there to the wheel centre and from there to the tooth that has just been released, and back to the arbor centre again - will trace out an approximate square.