American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 285
hand from re-coiling, must coincide, as the figure shows ;lastly, the inclined planes of the pallets mustmake an angle of about 60° with lines drawnfrom the centre of the wheel to their obtuseterminations. Such was the first methodthat was used for constructing the Grahamescapement, and the rule… … ment, the pallets ought to embrace or takein a given number of teeth, and that numberwhich they suppose to be right must not bedeparted from ; but there seems to be no rulethat necessarily prescribes any number ofteeth to be used arbitrarily. The nearer thatthe centre of motion of the pallets is to…
Clocks and watches
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