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

Correct Electrolysis By Use of New Device N ELECTROLYSIS _ eliminator which its manufacturers claim ends for all reasonable time the pres- ent “cancer of electrolysis which is eat- ing away stern bearings, propellers and propeller shafts, rudders and shoes, is now marketed on the Pacific coast by the Marine Electrolysis Eliminator Co., Seattle, after two years of demonstra- tion on nearly 100 Puget Sound ships. The device, which is slightly concave and circular in shape, comes in three sizes, and is usually attached in pairs to the bottom of the ship, with a cop- per-wire hook-up to the engine and water circulation system, also to the stern bearing and stuffing box on the propeller shaft. It is claimed the cause of the many trips to the dry-dock made by salt-water craft now is the fact that the circulating water system, with its brass and iron piping and salt water for an electrode, constitutes a perfect galvanic battery. No effort is made to alter this fact, but the current’s flow is reversed ingeniously. With the eliminator installed, a re- movable core or electrode is the only article eaten away, the flow of former- ly destructive current is reversed and now electroplates and improves bear- ings it formerly gnawed away. ‘‘Cures” of cancerous electrolysis that ate out stern-bearings as high as eight times in four months have now been judged permanent, after a year’s operation and a dry-dock examination that proved no repairs to be necessary. An example of the action of electro- lysis on the movable core of a marine electrolysis eliminator is shown in the accompanying illustration. On the left is the core taken as a specimen from a Puget Sound vessel after nine months’ use, when 20 per cent of the metal had been eaten away. On the right is shown a new eliminator for comparison only. Tests of Marine Signal Device Proves Success DEMONSTRATION of a new A aerial marine flare signalling device was held on _ the evening 40 of May 28 for the benefit of the members of the executive com- mittee of the marine section, Na- tional Safety council. The coast guard cutters RELIANCE and CUYAHOGA Car- ried the party out to Ambrose light- ship, New York harbor, from which point the two ships sailed a diverging course that separated them a mile every six minutes. The signals were fired at intervals of a mile until the limit of the 15-mile course had been reached and the demonstration was de- clared a complete: success. These signals are suspended fein a parachute and ascend to a height of 250 feet, the lights being visible at a distance of 25 miles. The system has been approved by the United States steamboat inspection service and adopted by the coast guard as a part Marine Electroly- Sis Eliminator, Showing Core Af- ter use and New Eliminator of their regular equipment. The red signals are of 30,000 candlepower in- tensity and the white signals are of 50,000, the average duration of burn- ing being 35 seconds. The signals are shot from a hand pistol constructed of brass and rust-proof steel weighing ap- proximately four pounds and are espe- cially designed for lifeboat use and ship signalling. In addition to the signal being an aerial flare, it can also be used as a hand torch. The equipment provides a light hand holder for the signal and a supply of scratchers for manual ig- nition. The International Flare-Signal Co., Tippecanoe City, O., is the manu- facturer of the new device. A New Prime Mover Pu: THE meeting of the Royal So- ciety of Arts in London, June 4, a paper was presented by J. F. J. Malone on a new prime mover, the thermal dynamic medium of which is a liquid. While this new engine is similar in some fefatures to the hot air engine, it differs in the fact that the medium is a liquid. Features claimed for the new engine are the small quantity of medium required; its freedom from wastage; its long thermal range; its ability to give good efficiency on cheap fuels; its freedom from explosive hazards; silence and elasticity. Water has been selected as the best thermo- dynamic medium. MARINE REVIEW—July, 1931 New All-Welded Rolled Steel Gear Blank HE all-welded rolled steel gear blank shown in the accompanying illustration is made for use in the manufacture of cut gears, either spur, herringbone or helical, and can be Arc Welded Rolled Steel Gear Blank made any size from 24 inches out- side diameter up. The largest blank made up to the present time is one with a shipping weight of 4350 . ‘pounds, of 6634 inches outside dia- meter, 1134 inches width of face, 4% inches thickness of rim, and 22% inches diameter hub. While these blanks are ordinarily made entire- ly from §. A. E. 1020 carbon steel, the rims can be furnished in steels of special analyses if desired. The hubs of the all-welded gear blanks are first gas-cut from solid rolled steel to give the desired hub diameters. The webs are gas-cut from rolled steel plate, as are the ribs, the latter being formed into channels of the required section. The webs are are welded to the hubs, and the reinforcing channels are welded to the web structures. The final oper- ation consists of the circular bending of the gear ring, and arc-welding in position to form the finished gear blank. In the manufacture of all-welded gear blanks, no patterns are required as the gas-cutting and arc-welding are done with blueprints of the gear designs as the guide. This eliminates pattern cost and permits prompt manufacture and shipment, since no time is required for pattern-making. The major advantages of the all- welded gear blank are the purity and homogeneity of the thoroughly-an- nealed rolled steel from which the gear blanks are made. The gear rings can be uniformly cut, and the cut teeth are sound in structure. Lukenweld, Ine., Coatesville, Pa., are the manufacturers. On June 1 the Atlanta, Ga., sales office of Cutler-Hammer Inc. was moved to 133 Cone street N. W. on the street floor. eS ee ey ee Ne I 5