The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

596 THE MarRINE REVIEW ENp ELEVATION. lever is about 65 feet long and per- mits the trolleys to reach beyond the center line of any warship now built or building. The center track is for the auxiliary trolley and: the outer tracks for the two main trolleys. The Main Hoist. The main hoist has a lifting and traveling capacity of 100 gross tons (224,000 pounds) and the mechanism' is so arranged that both operations can take place at the same time. The two main trolleys are each mounted on eight spring-equalized wheels, and each is capable of handling 50 gross tons. The trolleys can be handled separately or together as desired. The hoist cables are of 13-inch plow steel and lead over a series of sheaves to the two main hoisting drums in the machinery house on deck. These drums are gear-driven by a pair of 12 x 15-inch hoisting engines through . two separate sets of gearing, giving a low speed for lifting the maximum ' nner n------ ek =z -? * BS hie Se aes \ \ vv load, and a higher speed for the empty hook. The main trolleys are October, 1910 drum, so that this operation is inde- pendent. of the hoisting motion. The specified hoisting speed of the main hoist with a full load was a minimum of 7 feet per minute with a trolley travel speed of not less than 100 feet per minute. Without load the speed of the hook was to be not less than 100 feet per minute. The Auxiliary Hoist. The auxiliary hoist has a capacity of 15 gross tons (33,600 pounds) and is operated from a single four-wheel trolley traveling on the center track. Its cables lead to separate hoisting and traveling drums similar to those of the main hoist. The operations of hoisting and traversing can be car- ried on simultaneously. The auxil- iary trolley machinery is located in a separate steel frame house on one side of the deck, and the operating levers are all carried to a separate operat- or's house above it. With full load Cross SECTION AT CENTER. traversed by a pair of 10 x 12-inch re- versing engines, geared to a 60-inch Sipe ELEVATION, the specifications called -for a hoist speed of not less than 50 feet per minute and a trolley travel speed of not less than 200 feet per minute. The hoist speed with empty hook was to be not less than 100 feet per minute. The Power Plant. Steam at 150 pounds is supplied to the hoisting and trolleying en- gines, the pumps, generator set and the steam windlasses by two 60-horse- power marine type boilers. For sup- plying current for the electric motor on the counterweight and also for the electric lights, a Shepherd vertical high-speed engine is provided, direct connected to an 87-kilowatt Westing- house 250-volt generator. This equip- ment makes night operation practica-