1. In which season does a watch go slow and why ?
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Automatic watches must be wound to start the watch running, either by manually winding at the crown or by wearing the watch for a sufficient amount of time to wind the mainspring. ... If the watch is fully wound and still runs slow, this is an indicator that it is due for maintenance.
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In winter, due to contraction, the effective length of the pendulum gets shortened, and so the time period is decreased and the pendulum completes more oscillations in a given time i.e. the clock goes fast.
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