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Three Choosing an escapement
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Published:September 1995
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Abstract
The number of different ways of maintaining a pendulum in oscillation is legion, and over the centuries many schemes have been tried - so many, indeed, that it would hardly be practicable even to list them, still less to place them in an order of merit, so I shall describe only those that are relevant to my story. First there are one or two matters of terminology. It is in the nature of mechanics that a pendulum should be maintained by a succession of little pushes rather than a continuous drive. A force acting through a given distance supplies a pulse of energy, known in mechanical horology as an impulse, which is unfortunate. To the academic mathematician, an impulse is defined as a force acting for a certain length of time, giving rise to a change of momentum, which is a different concept altogether. We must simply put up with this misuse of terms, which is hallowed by tradition.
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