The port of Philadelphia, its facilities and advantages . of sufficient size to duplicatethe present plant should additional power be required in thefuture. The installation is unique among ore handling plants inwhich, of course, the load is always intermittent, in that noauxiliary devices whatever are used for maintaining the volt-age constant through varying loads, the inherent regulation ofthe machines being so entirely satisfactory that none are re-quired. In most plants of this kind fly wheels, liquid resist-ance, or some device of similar nature is usually employed tomaintain a constant
The port of Philadelphia, its facilities and advantages . of sufficient size to duplicatethe present plant should additional power be required in thefuture. The installation is unique among ore handling plants inwhich, of course, the load is always intermittent, in that noauxiliary devices whatever are used for maintaining the volt-age constant through varying loads, the inherent regulation ofthe machines being so entirely satisfactory that none are re-quired. In most plants of this kind fly wheels, liquid resist-ance, or some device of similar nature is usually employed tomaintain a constant voltage, but in this case, the voltagevariation is only from three to four volts with a range in leadon the rotaries from 12,000 to 2,700 amperes. After considerable investigation of the ])r()blem it was de-cided that the best s^^stem to install, considering it from allsides, was steam turbine alternators and rotary converters. Asmall plant located aborrt one and one-half miles distarrt fromthe main power station had to be operated also; therefore, 32 I. 33 alternating cnnent was selected so it could be transmittedreadily to the smaller plant, using transformers at l)otb thegenerating and receiving ends. The pier which is 704 feeet in length and 69 feet in widthis built of concrete face walls supported on piling, and filledin with earth to a point 15 feet above low water, on which fourrailroad tracks are laid. The face walls of the pier are alsothe foundation for the runwa3^s for 2 Brown Hoist electricallyoperated ore unloaders. These machines travel the length ofthe I ier, spanning four railroad tracks. The machines areequip})ed with grabbuckets having a capacity of five (5) tonseach, which aie operated from a trolley located in the machinesat a point 50 feet above the tracks on the pier. The trolleyis carried on a track which extends over the ship, and theoperator is located in a cab on this trolley, in such a positionthat he always has the bucket in view. The ore is depo
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherharri, bookyear1914
