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Chronograph pioneers, watches with seconds and independent seconds appeared in the second half of the 18th century. They can measure shorter time intervals, but still lack the ability to zero. The second part of the measurement and the second part of the advent of quite early. 1720 George Graham built a pendulum with a device that beats for seconds, with pointers that divide each second into four beats. When the direct-driven second hand was added to the pocket watch in the 18th century, watchmakers began to seek ways to stop the movement of the second hand in order to measure short time intervals. Their initial solution was to stop the movement of the second hand itself. This is the rationale behind Romilly's second-second watch (1754), found in Diderot's encyclopedia. I The center pointer beats once a second. In 1776 Jean-Moïse Pouzait of Geneva published a paper describing the principle of an independent second hand watch. A separate gear train allows the second hand to be stopped or started at will, independent of the mechanism driving the hour and minute hands. However, because the second hand can not be zeroed, the user still has to write down the start time and then calculate the metered time interval. The 19th century improvement of this device, as well as the invention of the reset function, produced the chronograph we know today.
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