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18 MARINE REVIEW. , bearing of the windlass shaft. Between the ends of the worms and the thrust bearing are placed alternately cast iron and com- position thrust rings, which, with the ends of the worms, run in a bath of oil, the oil-boxes being part of the same casting as the thrust bearing. The worm gears are each composed of two pieces--a center, which is keyed solidly to the shaft on which it is located, and a loose toothed rim engaging the worm, this rim being also fitted on its inner surface with rachets which drive the centers by means of pawls held in position by springs. These pawls may be thrown out of contact with the rachets on the rim so that the windlass is always ready for use, either by hand or steam power, without changing any of the parts. In addition to the regular purchase (which is sufficient to raise both anchors at the same time under ordinary circumstances) the additional worm wheel on the windlass shaft (through which power is applied by hand) affords means _ for obtaining a double purchase for use in an emergency. This is done by throwing out the pawls in the main driving gear, and applying the power from the engine first to the upright or capstan shaft, and then to- the windlass shaft through the coarse pitch worm and wheel ELECTRIC LAUNCH--BUILT BY THE DETROIT BOAT WORKS. HXHIBIT OF SHIP MACHINERY DEPARTMENT--BATH IRON WORKS, BATH, ME. when it is desired to reverse the windlass or use the double purchase. The windlass may be driven by hand from the deck above by a capstan, which is connected with the windlass by means of a coarse pitched quadruple-threaded worm on the upright cap- stan shaft, engaging with a worm gear on the windlass shaft. This worm gear is of the same kind as the main driving gears of the windlass and capstan, the center being keyed firmly to the windlass shaft, and driven from the loose rim by means of rachets and pawls, as in other cases. This arrangement does away with the necessity of disengaging gear for either steam or hand power, through which the hand power is applied. 'The wild-cats, over which the cables run, are locked and unlocked by a positive screw locking device, which is so designed that the wild-cats may be easily unlocked, even with a heavy strain on the cables, The wild-cats are controlled when paying out chain by friction bands arranged with powerful brakes, the whole being of sufficient strength to "ride" by, so that when riding at anchor more cable ney be paid out at a moment's notice simply by slacking the ake. The capstan connected with the windlass is driven direct from the engine shaft by worm gearing in the manner commonly