Hand Remover
The style of watch hand remover shown in Fig. 163 is a very nice pattern and can also be used as a roller remover and for several other purposes. The action of the tool can be readily understood by examining the illustration. The threaded wire in the center extends through the entire tool and is raised or lowered by the milled nut at the end of the handle. This tool can also be used for holding hands while broaching the hole, or the tool shown in Fig. 164, and known as the nine-hole sliding tongs, and many other patterns, for sale by material dealers, may be used for the same purpose. Fig. 165 shows a second hand holder, with the hand in position ready to broach. This tool can also be used as a screw head tool. In order to broach out a new hand, if the boss of the old hand has been preserved, place a small slip of cork upon the end of the broach and insert it in the old hand as far as it will go, and the new hand may then be broached until the cork is reached before trying it for a fit. The holes in the hands may be closed by forcing them into a conical hole in a steel plate, first turning off the metal around the edge of the hole, so that it is left rather thin, or it may be contracted after reducing the edge, by means of the stake.
HARRIS, RICHARD. A clockmaker of London. Comparatively little is known of this clockmaker, except that a friend of his, one Thomas Grignion, authorized his son to make known that Richard Harris was the person who first applied a pendulum to a clock, eight years before Vincent Galileo laid claim to having made a clock regulated by a pendulum. There is no evidence, however, to prove that Harris was the inventor of the pendulum.
HARRISON, JOHN. This celebrated horologist was born at Faulby, Yorkshire, England, in 1693. In 1700 the family moved to Barrow, in Lincolnshire, where he carried on the business of repairing watches and clocks. In 1735 he went to London with a timekeeper of his own invention and construction, and through the interest taken in him by Graham and Halley, he was allowed, in 1736, to take it on board a king's ship to Lisbon. In 1761 he made another chronometer which was thought sufficiently correct to enable him to claim the government reward offered in 1714. The government offered pond20,000 to anyone who would make a chronometer that would determine the longitude to within half a degree. He received the reward in 1767. He is credited with being the inventor of the going fusee and the gridiron pendulum. He died in 1776. HAUTEFEUILLE, JOHN. An ingenious mechanic born at Orleans in 1764. He was the first person to apply a small steel spring to regulate the vibrations of the balance. Huyghens applied for a patent on the invention, but was refused, on the ground that Hautefeuille had laid his invention before the Academy of Sciences in 1694, some years before. In 1722 he invented what was known as the rack lever escapement.
HENLEIN, PETER. A clockmaker of Nuremberg, to whom some authorities give the credit of the invention of the pocket watch. It is claimed that he made pocket watches or clocks, soon after the year 1500. He was born in 1480, and died in 1542.
HOOKE, ROBERT. He was born at Freshwater, Isle of Wight, on the 18th of July, 1635. In 1658 he invented the hairspring and applied it to a watch for Bishop Wilkins in 1661. About the same time he invented the circular or conical pendulum, which was in 1663 shown in the Royal Society. In 1664 the Royal Society gave him an annuity of pond30 for his work as director of experiments. He invented anchor pallets in 1666. In 1655 he invented a wheel cutting engine and rounding-up tool for watch and clockmakers. He was also the inventor of the hydrometer and leveling instrument, and the author of the axiom on the compression and extension of springs and other elastic bodies "as the tension is so is the force." In 1677 he was elected Honorary Secretary of the Royal