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World's biggest dredge
CURRENT TOPICS. World's Biggest Dredge.--( Engineering News Record, Vol. 119, No. 12.) T h e War Department's new hopper dredge, the Goethals, which was launched recently is the world's largest. Its overall length is 476 feet, loaded draft 25 feet and it has a hopper capacity of 5000 cubic yards. T h e dredge will work to a maximum cutting depth of 50 feet. Four boilers operating at 425 lb. pressure supply steam to turbo-electric generators. Two electric propelling motors are rated at 2250 hp., and two 32 in. dredging pumps are each driven by a I3OO hp. motor. The dredge is of the two compartment type, so that when fully loaded and with two compartments flooded the vessel will still float. R. H. O.
Giant Hydraulic Press for Aircraft.--(Iron Age, Vol. 14o, No. 12.) T h e Douglas Aircraft Co., Inc., Santa Monica, Cal., has installed what is said to be the largest high speed hydraulic press in the world. Used to accomplish several thousand production operations in the shaping and forming of parts for commercial transports, the press is self-contained with a pressure capacity of 5ooo tons. The maximum opening between platen and bed is approximately 4 feet. The total pressing force is created by a single hydraulic ram 6 ft. in diameter. This is actuated by oil under a pressure of 25o0 lb. per sq. in. Hydraulic pressure is generated by a b a t t e r y of four large radial pumps of the variable-reversible-dellvery type and these are direct-driven by two 15o hp. motors. The hydraulic power from these pumps is directly applied, without intervening valves, to the press rams. The speed and direction of press movements are thus controlled by regulation of the volume and direction of pump output. This makes possible high speed operation with absolute smoothness. R. H. O. P l y w o o d . - - I n a twelve page pamphlet (No. 16), the National Lumber Manufacturers Association covers the whole subject of specifications for this valuable modern lumber product. There is a description of the product, its method of manufacture, and its guaranteed inspection under the Douglas Fir Plywood Association. There is a glossary of terms and abbreviations and a brief table of 8Ol
Giant Hydraulic Press for Aircraft.--(Iron Age, Vol. 14o, No. 12.) T h e Douglas Aircraft Co., Inc., Santa Monica, Cal., has installed what is said to be the largest high speed hydraulic press in the world. Used to accomplish several thousand production operations in the shaping and forming of parts for commercial transports, the press is self-contained with a pressure capacity of 5ooo tons. The maximum opening between platen and bed is approximately 4 feet. The total pressing force is created by a single hydraulic ram 6 ft. in diameter. This is actuated by oil under a pressure of 25o0 lb. per sq. in. Hydraulic pressure is generated by a b a t t e r y of four large radial pumps of the variable-reversible-dellvery type and these are direct-driven by two 15o hp. motors. The hydraulic power from these pumps is directly applied, without intervening valves, to the press rams. The speed and direction of press movements are thus controlled by regulation of the volume and direction of pump output. This makes possible high speed operation with absolute smoothness. R. H. O. P l y w o o d . - - I n a twelve page pamphlet (No. 16), the National Lumber Manufacturers Association covers the whole subject of specifications for this valuable modern lumber product. There is a description of the product, its method of manufacture, and its guaranteed inspection under the Douglas Fir Plywood Association. There is a glossary of terms and abbreviations and a brief table of 8Ol