A New Astronomy

Cover A New Astronomy
A New Astronomy
David P David Peck Todd
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Equality of surrounding conditions is secured as much I View into Clock-room (Lick Observatory) 2 1 2 The Observatory and its Instruments as possible by keeping clocks and chronometers, as the last illustration shows, in a small and separate room, where the air may readily be kept dry and its temperature nearly constant.
Pendulum and Escapement. Horology is the science which em- braces everything pertaining to measurement of time, and to mechani- cal contrivances for effecting this end. The chr
...onometer is described and pictured in the preceding chapter (page 171). Accurate running of a clock is dependent mainly upon two parts of its mechanism, (a) the pendulum, and (b) the escape- ment. The pendulums of all observatory and standard clocks are compensated for temperature, so that the natural fluctuations of this element may have little or no effect upon the length of the pendulum, and therefore upon its period of oscillation. There is a variety of methods by which the compensation is effected.

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