A rudimentary treatise on clock and watch making; with a chapter on church clocks; and an account of the proceedings respecting the great Westminster Clock by Denison Edmund Beckett

Author:Denison, Edmund Beckett
Language: eng
Format: epub, pdf
Tags: Clocks and watches
Publisher: London, Weale
Published: 1850-03-25T05:00:00+00:00

the time that a common key takes. The watchmakers them-selves always use these pencil keys.

CHRONOMETERS.

120. The perfection of all the watch escapements is that which has from its use acquired the name of the chronometer movement, but was originally called the detached, the balance being entirely detached from everything else except just at the time of action : in other words there is no dead friction; and moreover the impulse is given directly, and nearly at right angles to the line of centres of the balance and scape wheel, as in the duplex escapement, instead of obliquely as in the vertical, lever, and horizontal escapements; and therefore it is not subject to derangement by the variable state of the oil, as it requires none. The teeth of the scape-wheel, instead of resting against a verge, rest against a stop S set upon a lever a b. This lever having only to move

through a very small angle is set upon a small and stiffish spring at a instead of a pivot, which allows it to move just avS a pendulum spring does a pendulum. The other end of

H3

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