. Marine Engineer . m delay, January i, iqo8. THE MARINE ENGINEER AND NAVAL ARCHITECT. 203 whereby the fitters or platers are regularly suppliedwith such material as and when required; the numberof cranes employed also enables an equivalent numberof squads of fitters or platers to be continuously andefficiently employed, each crane being able to traversethe whole distance of the berth with its load. Further-more, two or more cranes may be brought to bearupon any exceptional load. The lattice girders which connect together, at thetop, the vertical members, thus preserving the gaugeof the crane
. Marine Engineer . m delay, January i, iqo8. THE MARINE ENGINEER AND NAVAL ARCHITECT. 203 whereby the fitters or platers are regularly suppliedwith such material as and when required; the numberof cranes employed also enables an equivalent numberof squads of fitters or platers to be continuously andefficiently employed, each crane being able to traversethe whole distance of the berth with its load. Further-more, two or more cranes may be brought to bearupon any exceptional load. The lattice girders which connect together, at thetop, the vertical members, thus preserving the gaugeof the crane gantry, may, if desired, be replaced byroof principals at a somewhat increased cost, and theycan be roofed in with glass or other material, so thatcomplete protection is afforded in all weathers duringconstruction, and work can be proceeded withuninterruptedly. The overhead travellers are electrically driven, andare proportioned for a working load of 15 tons, thespan being 108 feet and the total length of gantry 750. Fig. feet. The walking cranes are also electrically driven,and are four in number, two on each side of thegantry, each commanding an area of 30 feet radius. The overhead travelling cranes have a verticallifting range of 140 feet, and three motions, viz.: lifting,travelling and traversing, each operated by separatemotors arranged to run on a 440-volt circuit. Thesemotois are series wound, the lifting motor , running at , the travelling , running at , and the traversingmotor , running at about Thespeeds attainable are as follows, viz.: Lifting, with full load, about 40 feet per minute )» I > no n ») 100 1 f T Travelling ,, full »» • > 500 )1 » n ») no »» » 750 »» » Traversing „ full ?» »1 220 »» ) >» »» no >» . i ? 350 11 1 The walking cranes are constructed for a liftinglo d of five tons at a radius of 30 feet, to run on asingle rail, the height between same and t
Size: 2321px × 1077px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondon, bookyear190
