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226 THE MARINE REVIEW FIG, 2--CLEANING HULL OF STEEL YACHT WITH FOUR-NOZZLE SAND BLAST 'MACHINE PREPARATORY TO REPAINTING means of a drain cock at the bottom -- of the separator. the 'sand, by reason of the low pressure in the machine, is carried to the sand blast nozzle at compara- tively low speed, doing away with much of the wear which generally results from the passage of abrasive particles through the hose and con- nections. On entering the nozzle, the stream of sand is picked up by a current of air which enters from an independent hose connection, under higher pressure and at much greater velocity, and the abrasive thus is im- pinged against the surface to be cleaned at the maximum velocity. The nozzle which is employed is of the Kelly type, consisting of the nozzle frame, to which the hose connections are attached, and the tip and tip holder which fit into the nozzle. Recently Mr. Lee developed a new form of resilient tip, which takes the place of the old tip and tip holder. This, it-is claimed, will stand up under the work for several days. An- other advantage of the resilient over the steel tip is that the discharge opening does not increase in diameter S02 74 707 June, 1914 so rapidly with friction and hence the air consumption is kept at a more constant rate. Where the supply of air is limited, this is an important feature, since the rapid enlargement of the circular area of the nozzle orifice must result necessarily in de- creased cutting power of the abrasive. When desired, special nozzles can be furnished which create a_ spray of atomized water to kill the dust-gen- erated by the sand blast stream. -- The cleaning capacity of the sand blast machine is 10 to 20 sq. yds. of steel surface for each nozzle per hour. The sand blast is equally ef- fective in cleaning old steel hulls, preparatory to repainting, and in cleaning mill scale off the hulls of new vessels prior to applying the initial coat of paint. The machine is portable, being mounted on a four- wheeled truck which easily can be moved by one man. It may be used wherever an air supply is available. The sand blast may be used effective- ly with the nozzles elevated as high as 150 ft. above the level of the ma- chine. The steamer City of Rome, burned to the water's edge off Ripley, N. Y., on May 7, was abandoned to the under- writers as a total loss. The City of Rome was built at Cleveland in 1881, and was formerly owned by the Gil- christ Transportation Co. She was purchased by George M. Steinbrenner and James Mitchell about two years ago. Lee QDusonurce No2z2t0 FOSITIVE Feep Sano BLasr MACHINE, Di stGNEO FOR Nev. Yori Cemenr Gun Co 30 CHaurcy Sr. NEw Yor Sy FIG, 3--TOP, SIDE AND BACK DETAILED VIEWS OF FOUR NOZZLE SAND BLAST MACHINE j : ;