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

1919 October, THE MARINE REVIEW WRECKED VESSEL AS SHE APPEARED IN THE DRYDOCK BEFORE PUMPING OUT Meantime, the stern frame had been manufactured and was set in place im- mediately after vessel had been placed in dry dock a second time. The entire stern overhand of the vessel, from and including the transom frame aft, had been assembled and riveted together on shore and after being hoisted in place was secured on stays. The counter of the ship weighed about 1214 tons, while the sternpost weighed approximately 11% tons. While the work of reconstruction was under way the propeller, tailshaft, stern tube, intermediate shafts, bearings, hand steering gear, rudder, fittings, winches and accommodations were being rushed to completion so that there would be no delay in their installation as soon as the work on the hull had advanced far enough to receive them. Following the erection of frames, floors, beams and stringers, templates were made of the shell plating. This was immedi- ately fabricated, hung on the ship and riveted in place. Uses of Monel Metal Although discovered about 10 years ago the adaptability of monel metal tc marine work is just beginning to be more widely utilized. This tesembles nickel in appearance but has tensile properties more like steel. .Tech- nically, it is an alloy of nickel and Copper, containing about 67 per cent nickel, 28 per cent of copper, and 5 per cent of other elements. This remain- ing 5 per cent consists partly of iron from the original ore and partly of manganese, silicon and carbon intro- duced in the process of refining. It 'ontains no zinc or aluminum and can be machined, forged, soldered and welded, both electrically and by the metal oxyacetylene process. It takes and re- tains a perfect nickel finish. In cast form, its minimum tensile strength is _ 65,000 pounds per square inch, while in rolied form it tests as high as 100,000 pounds per square inch. Monel metal is said to retain its strength at high temperatures, and this makes it particularly valuable for the iriaming of valves used with super- heated steam, for turbine blading, and ail purposes where strength at high temperatures is most noncorrosive properties are said to be high. This metal is adaptable for propellers of all sizes. It is used for pump liners, pump rods, propeller shafts and boat trim, such as deck fittings, stern bush- ings, rudders, struts, stuffing boxes, shaft sleeves, etc., and for marine con- denser parts, such as tubes, ferrules, etc. Monel metal is not a synthetic alloy, but is a natural combination of nickel and copper. It was discovered in an essentials Its: 483 ore deposit in Ontario. About 14 years ago, the idea was conceived that for retiain -purposes it was not necessary fo separate the nickel and copper in this ore, but that an alloy could be produced direct. This was proved to be both technically. and commercially possible, the result being the inaugura- ticn of the monel metal industry. Has Squ are Masts In the Mosuico, a vessel built by the Mobile Shipbuilding Co., Mobile, Ala., the lower portions of the masts, which are steel, are square instead of the time- honored round section. The steel por- tions rise 41 feet above the deck and are arranged so that they can be low- ered, forward or aft, for passing under bridges. The wooden parts of the masts are 34 feet long making the total length 75 feet. The wood section be- gins at the crow's nest, forward, and enters the steel portion for approximate- ly a depth of five feet. The steel part at this juncture is 1 x 1% feet. Machining Propellers The accompanying illustration shows a propeller 17% feet in diameter, one of several being built by the Hyde Windlass Co., Bath, Me. This unit is manganese bronze. To take care of the excessive shrinkage of this material and to provide a suffi- cient head to insure filling the mold it is necessary to allow considerable excess' metal. . This . casting. as. At comes from the sand weighs 31,000 pounds and when finished ready for installation this weight is reduced to 28,000 pounds. In the accompanying illustration, the operation shown consists of cut-. ting away the head: This is ac- complished by mounting the unit on the floor, so it can be swung radi- ally, and drilling a series of holes CUTTING AWAY THE HEAD ON A LARGE PROPELLER BY DRILLING INTERSECTING HOLES