Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 941
t zero, giving an impulse according to its weight, by which time the pen-dulum meets the left arm, releasing the scape-wheel, when it is instantly carried back and locked,leaving the left arm free to follow down the pendulum and give its impulse. A friction-fly is placedon the scape-wheel staff, to… … lK -ru-LTu^ and it would no doubt supersede all others but for the fact that, the scape-wheel turning with sixvibrations of the pendulum, it requires a train of ten times higher speed than the Graham or pin escapement, which makes the train very sensitive to theslightest obstructions, besides…
Mechanical engineering -- Dictionaries
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