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Floating Cranes for Navy The Wellenan:Senner Moratn Co. Construct Two 150-Ton Pontoon Cranes With Busch-Sulzer Diesel Engines for the United States Navy HE Wellman - Seaver - Morgan Co., of Cleveland, recently constructed two 150-ton. float- ing cranes of exactly similar type, equipped with Busch-Sulzer Diesel en- gines for the bureau "of yards and trolley, having a capacity of 15 tons, travels on rails between the two center trusses. Between the center trusses and the outside trusses a 75- ton trolley is carried on rails on each The extreme travel of the main side. "FIG, 1--THE HONOLULU CRANE docks, United States navy, one for the Boston navy yard and the other for the Pearl Harbor naval station, Pearl Harbor, Hawaii. These pontoon cranes consist es- sentially of a bridge type superstruc- ture, mounted on a steel pontoon, the cantilever arms of the superstructure extending beyond the ends of the pontoon a sufficient distance to give a hook travel of approximately 64 ft. beyond each end of the float. The superstructure is rigidly con- nected to the pontoon and the trusses carried by the supporting legs are ap- proximately 290 ft. overall, supported by shear legs forming a center span of 115 ft. These shear legs are sub- stantially braced in order to take the end load due to the fore and aft list of the pontoon. sufficient height to give a maximum hoist of the main hooks of 70 ft. above the top of the deck and suf- ficient hoist rope is allowed so that these hooks may be lowered 25 ft. below the deck of the pontoon. | The bridge trusses are four in num- ber and arranged -so that an auxiliary 'The legs are of. trolleys is approximately 251 ft. from one end: of the truss to the other. Each of the 75-ton hook blocks sup- ported by the main trolleys is carried ft. wide. on a double 4-part hoisting rope 15% in. diameter. These ropes are equal- ized at one end and are wound upon drums which are located in one of the machinery compartments in the pontoon, as will be described later. The 15-ton hook block is supported by four parts of cable which is also wound upon a drum in the machinery compartment in the pontoon. The pontoon is of steel construction throughout, having a moulded length of 125 ft., moulded breadth of 70 ft, and a moulded depth of 14 ft. This pontoon is divided into 26 watertight compartments, being provided with collision bulkhead running fore and ait 5 ft..from each side of the pon- toon, and a water-tight bulkhead fore and aft through the middle, extending the entire length. Transverse bulk- heads are arrangéd forming two ma- chinery compartments amidships, one on eithér side. These compartments are approximately 43 ft. long and 30 Water-tight compartments also form four full-depth counter- balance tanks approximately 15 ft. square at each end, these tanks being used to counterbalance the pontoon when lifting the maximum load at the extreme end of the cantilever arm. The machinery compartments are provided with inner bottoms 4 ft deep. Power for operating this crane is FIG, 2--BOSTON NAVY YARD CRANE HANDLING TEST LOAD OF 150 TONS