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A term applied to a watch or clock in which the second-hand is mounted on the central arbor and completes its revolution in one minute.
It is more easily read than the ordinary second-hand traversing in its own small dial.
The beat of the second-hand may be seconds, or fractions of a second.
In the original form it beat with the balance, a third of a second at a beat.
The largest center-second clock known to the writer is the turret-clock for the Bombay Harbor Board, which indicates hours, minutes, and seconds upon a dial 8 1/2 feet in diameter.
The center-second hand measures 6 1/2 feet in length, and its end has a motion of 5 inches per second, acquiring a momentum which has been overcome by a series of sixty levers, so arranged that the second-hand rests in one of them at each beat; the point of the hand being so contrived that when it rests upon a lever it is detained there, and can get neither backwards nor forwards until the clock-wo