. Journal of electricity . equired the use of the drydocks, butthe placing of boilers, guns, armor plates and otherheavy equipment has been done so much more easilywith this crane than was formerly possible, that itis now said to be one of the handiest pieces of equip-ment at the yard. The steel pontoon which forms the support forthe superstructure is 85 by 140 ft. in plan and 15 Full depth collision compartments entiielysurround it and there are also longitudinal and trans-verse bulkheads in the interior. Compartments forthe boiler plant and generating unit are in the af ter-: end, a
. Journal of electricity . equired the use of the drydocks, butthe placing of boilers, guns, armor plates and otherheavy equipment has been done so much more easilywith this crane than was formerly possible, that itis now said to be one of the handiest pieces of equip-ment at the yard. The steel pontoon which forms the support forthe superstructure is 85 by 140 ft. in plan and 15 Full depth collision compartments entiielysurround it and there are also longitudinal and trans-verse bulkheads in the interior. Compartments forthe boiler plant and generating unit are in the af ter-: end, and have an open hatchway covered by a deckhouse. One end of this deck house is enclosed andused as the crane office. The superstructure is located on the longitudinalcenter line of the pontoon with its center 42 ft. fromthe forM^ard end. A fixed tower 43 ft. high, whichis secured to six bulkhead plates extending throughthe deck of the pontoon, surrounds the lower part ofthe rotating structure, called the pintle. The entire. The 150-ton electric crane at the Mare Island Navy Yard, California, hasfacilitated tremendously the handling of the construction and repair work $710,,510,000 is to be spent in the development of the powerresources west of the Rocky Mountains within the next nineyears. The power companies will be ready for the industrialload. FORWARD WESTERN INDUSTRY! 266 JOURNAL OF ELECTRICITY [Vol. 45—No. 6 rotating element of the crane consists of three parts,the pintle section, the machinery section and the motions of the crane are controlled from theoperators cab which is located on the rotating struc-ture. The main hoist, designed for a capacity of 150tons at a radius of 105 ft. (which gives a reach of621/2 ft. beyond the fender line), consists of two sep-arate units, arranged to be connected when handlingcapacity load. Their hook blocks are suspendedfrom a fixed position on the jib and operate at arate of 4 ft. per minute from any position between25 ft. bel
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectricity, bookyear
