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462 equipment. He is especially fitted for this: position in view of his wide gen- eral experience as a naval architect obtained in private practice and through his recent association with the Great Lakes Engineering Works, Detroit. Designs Valve for Marine Boilers A valve which is designed to do away automatically with leaks result- ing from the blowing-off of a boiler has been brought out by the Ever- lasting Valve Co., New York City, and now is being handled by the -Scully Steel & Iron Co., Chicago. Blowing-off is generally done by operating separately two different and THE MARINE REVIEW The lever is pulled back as far as it will go—generally about one-half turn. This causes the valve next to the boiler to open full, while the other valve is still closed. After the first valve is fully open, it is locked open while the slower operation of the sec- ond valve is taking place. The boiler then blows off. All this is done by one motion of the lever. After the boiler has blown off, the lever is pushed back to its original position. This results in the valve farthest from the boiler closing, while the other valve remains locked open, until the valve farthest from the boiler is closed. ~The nearest valve then closes. | The entire procedure of blowing-off a boiler is thus designed to be ac- NEW VALVE FOR MARINE BOILERS — distinct valves, one the quick-opening valve nearest the boiler and the other the slow-opening valve. This proce- dure sometimes involves. considerable trouble if the operator is indifferent and regards part of the work as un- necessary. As a result, in many in- stances, one of the valves is left open all the time and the blowing-off of a boiler is done by opening and closing the other valve which, under these circumstances, may soon begin to _ leak. When the valve leaks it is left open all the time and the ‘other valve used until it also leaks. This leaky condition naturally costs money while operating and results in the additional expense of closing down the boiler and making repairs. This new type of valve is designed to operate automatically both valves by a hand lever. The cycle of opera- tions of this type of valve is as follows: complished by two shifts of the lever, in order to simplify the operation. Resumes Manufacture of Hoists “The Link-Belt Co.. Chicago, recently announced its intention of resuming the manufacture of electric hoists and will specialize in hoists ranging in ca- pacity from 1000 to 6000 pounds. These machines, which will be manufactured at its Philadelphia plant, can be. adapted for either direct or alternating current and are fitted with plain, hand-geared, cord-operated motor, or a cage-operated motor ‘trolley. Fig. 1 shows a direct current, plain trolley hoist handling boiler cores in a foundry before the cores have been baked. The hoist employs a dynamic braking system- in which the descending load December, 1917 1—ELECTRIC HOIST HANDLING CORES IN A FOUNDRY — FIG. drives the hoisting motor as a generator and uses it for a brake. This type of brake permits work of a delicate na- ture such as the lowering of cores, to be handled with comparatively little dan- ger of breakage from sudden shocks. Ail parts of the hoist are enclosed. but they can readily be made accessible. By removing a sheet steel cover. the hoisting drum and controller may be reached and by removing the heads of the end housings the spur gears are exposed and may be slipped off the shafts. The cut steel gears run in oil and auto- matically. splash lubricate the bearings. Fig. 2 illustrates a hoist handling a large pulley in a manufacturing plant. The Canada Steamship Lines, Ltd., 9 Victoria square, Montreal, plans to build a shipyard at Cap de Madeleine, Que. Sans a FIG. 2—HOIST HANDLING PULLEY IN AN ERECTING SHOP A LARGE