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Large Bucket Is Saved by Thermit Welding FRACTURED bail lug recently A put the bucket of the dredge Crest, belonging to the Great Lakes Dredge & Dock Co., out of service. The huge bucket, with a capacity of 14 cubic yards, would have been cost- ly to replace, and the making of a new bucket would have meant weeks of delay. At the same time, repair, by most methods presented many dif- ficulties. For thermit welding, how- ever, the job was a comparatively simple one and involved merely the making of a new forging to take the place of the part which had carried away and the welding of this forging to the frame of the bucket. The repair was made by an oper- ator of the Metal & Thermit Corp. with the help of a small crew, re- eruited from the yard forces of the Great Lakes company. The new forg- Welding repair to dredge bucket by thermit method ing was first placed in position and carefully aligned. Then, a wax pat- tern was applied and the next steps were the building of sheet iron mold box, the ramming of the mold and the usual preheating, in this case requir- ing 6 hours. The thermit was then reacted and poured and, after the weld had cooled thoroughly, the mold was removed and the job completed by cutting away the gates and risers. The bucket may now be considered aS good as new. A Four-Duty Coupling O TAKE its place with other products in the line of general transmission equipment manufac- tured by The Falk Corp., Milwaukee, Wis., this company has developed the Falk-Rawson four duty coupling. This coupling performs four import- ant duties—it starts, couples, cush- ions, and limits the load. The new coupling makes possible substantial savings in electrical equipment such as motors and con- trols, and protects the machine driven by affording smooth gradual 28 starting and cushioning of overloads. It will save electrical power by re- ducing inrush current and allowing the selection of smaller motors oper- ating closer to their maximum ca- pacity. In addition, it eliminates the need of shear pin couplings while ful- filling the functions of a flexible coupling and in other ways increas- ing the economy and efficiency of the drive. The primary function of the new coupling is as an automatic starter, centrifugally operating. This func- tion is accomplished in a simple way. Essentially the construction involves merely two drum shaped members, one attached to the driving shaft and the other to the driven shaft. Be- tween driving and driven members are inserted two sets of floating seg- ments, made usually of brake lining reinforced with lead; the amount of lead being calevlated to give the re- aquired centrifugal pressure for car- rying the load. Metal Cutting Band Saw HE band saw principle is just as advantageous for cutting metals as for wood. The more general adop- tion of such saws has only waited the development of a saw of this type especially designed and built for metal cutting. The Wells band saw, manufactured by the Wells Manufac- turing Corp. Three Rivers, Mich., now supplies that need. A band saw produces maximum cutting speed for the simple reason that a continuous running saw is al- ways cutting. In many comparative tests the cutting time with this saw has been one-half, one-third, or even less than with other types of equip- ment. Typical experience is the cut- ting of 1%-inch round cold rolled machine steel in 47 seconds. Blade Cost Is Reduced Blade cost with this saw is said to be only a fraction of that usually ex- perienced because the full length of the blade is used and blades with long life in this service are now available. When cutting soft metals other than east iron the blades seldom become dull throughout their entire life. Band saw for cutting metal MARINE REVIEwW—June, 1934 A New Fire Extinguisher For Quick Service UNIQUE new type of fire ex- tinguisher manufactured by the Wil-X Manufacturing Corp, 29 Ryer- son street, Brooklyn, N. Y., over- comes the disadvantages of the old style hand-operated extinguishers. This new ‘‘machine-gun”’ extin- guisher has the pump on the outside of the cylindrical container where it cannot gum up, jam, or corrode. The pump never comes in contact with the liquid, only compressing air which forces the liquid out under high pres- sure. A quick lift of the pump, and the new extinguisher supplies a steady stream of liquid directly at the base of the flames. It is easier to aim, and operates with accuracy. Its liquid will not leak or evaporate, for it is hermetical- ly sealed when notin use. The liquid ae) seas ae i on ae Se . Quick acting fire extinguisher is an absolute non-conductor of elec- tricity, and will also withstand a temperature of 52 degrees below freezing. Bronze for Bearings NEW form of bearing bronze, A semi-finished outside and _ in- side, has been developed by the Magnolia Metal Co., Elizabeth, N. J. An important feature of this ma- terial is that the inside surfaces are semi-finished as well as the outside. By this process the user of the mate- rial will avoid the inconvenience and delay sometimes caused by hidden blow holes, sand spots or cracks which might show up on the inside of the bushing when it is being ma- chined to the final dimensions. In the manufacture of the new bearing bronze bar stock, care is taken in semi-finishing to maintain full dimensions giving one-sixteenth inch extra metal both outside and in- side for final machining. It is there- fore possible to order actual sizes which incorporate the small addi- tional amount needed for machining.