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Equipment Used Afloat and Ashore Air Compressors in Harbor Work—Electric —New Type of Cargo Winch for Noiseless N INTERESTING account is A given below of the various uses of Westinghouse air compressors in San Francisco harbor. These compressors, installed on the pile driver of the state board of harbor commissioners are used to supply air for the operation of drills, augers, chippers, riveters paint-spraying and any other use to which air can be put in connection with the construction and mainte- nance of modern wharfage facilities. A steam driven compressor lends itself peculiarly for use in marine 10%-inch used in San Francisco Harbor Westinghouse Compressor construction work. A number of men are assigned to a given pile driver and while the men are driv- ing piles the steam generated by the boiler is used for operating the ham- mer. When they are through driv- ing the piles, it is necessary that the piles be bored for bolts and the piles tied together by means of timbers and stringers. This entails a tre- mendous amount of boring, which is now being done with air. When the men are using air oper- ated tools they are not running the hammer; therefore, the steam is available for the compressor. If they were using other than a steam driven compressor, the steam boiler On the pile driver would be perform- ing no useful work except while the piles were actually being driven. Where concrete piles and bulk- heads are used, the air is then used for drilling and chipping and where steel is encountered, the air is need- ed for the purpose of scaling, drill- ing, riveting, painting, ete. New Electric Glue Pot Ils Compactly Built COMPACT device which can be carried to the job, thereby elimi- nating the necessity of taking the vork to the glue pot has been mar- keted by the Black & Decker Co., Towson, Md. This portable trouble saver, an electric glue pot, maintains the glue at a constant temperature of 150 degrees Fahr., which gives the best working consistency for smooth tight joints. The heating element in the unit is a nichrome ribbon with mica plate and thermostatic control. The latter insures consistency of temperature at all times. The glue container of two quarts capacity is made of cast alu- minum, carefully machined to fit a gray iron receptacle, assuring con- servation of heat. In order to eliminate the possi- bility of fire hazards and the dan- gers of short circuits, and other trou- bles, this nichrome heating element is tightly sealed with asbestos. The sides of the pot are sloped to reduce spillage to a minimum. A _ heavy iron wiper across the center of the glue container prevents loss from drippage. Being a distinct scientific advance over the old style glue pots, this electric glue pot is practically in- dispensable wherever glue is used. Glue Pot Operation {—________ New electric glue pot with a capacity of two quarts New Steam Cargo Winches Claimed to Be Noiseless NEW steam cargo winch which is suitable for use on combina- tion freight and passenger vessels and which is claimed by the manufacturers to be noiseless has been developed by Allan Cunningham, Seattle, Wash. This new device, which is shown in an acompanying illustration, is said to be much more efficient than some of the older types of winches. Accord- ing to the makers, it requires less steam, operates very smoothly, and starts without jerk or friction, result- ing in less wear on rope and wires. It is also claimed to have 30 per cent greater capacity than older types. Steam cargo winch which has been recently developed MARINE REVIEw—March, 1931 49