. The Street railway journal . gious rotary velocities, and required the utmost nicety of regula-tion. This demand was met by the single valve, high speed, automatic of being limited to the first half with the alternative of carrying steamfull stroke if cut-off does not occur during that time. In addition tothe ever present demand for the highest efficiency, magnified in im-portance in electrical work by the relatively large proportion whichthe cost of power bears to the total operating expenses of an electricrailway station, and by the increased size of the installations, has comea demand ind
. The Street railway journal . gious rotary velocities, and required the utmost nicety of regula-tion. This demand was met by the single valve, high speed, automatic of being limited to the first half with the alternative of carrying steamfull stroke if cut-off does not occur during that time. In addition tothe ever present demand for the highest efficiency, magnified in im-portance in electrical work by the relatively large proportion whichthe cost of power bears to the total operating expenses of an electricrailway station, and by the increased size of the installations, has comea demand induced by the high cost of metropolitan real estate, uponwhich such stations must of necessity be situated, for the maximumamount of power in the minimum amount of space. Regulation, ofcourse remains as important a factor as ever. It is with a view of meeting these latest requirements that the en-gine under review has been designed by F. H. Ball, M. E., of the Ball& Wood Engine Company. It is an example of the tendency above. engine and shaft governor. The multipolar generator has made itpossible to run the armature at a moderate rotative speed, so moderatethat it can be attached directly to the shaft of a slow running, fourvalve, long stroke engine. Rotative speed, however, is still desir-able as a means of decreasing the weight and cost of the directlyattached electrical machinery. It is a fact, also, acknowledged evenby the builders of the other types, that the four valve engine leads ineconomy, and there has been for some time a visible movement in thedirection of controlling four valve engines through positive connec-tions to a shaft governor instead of by means of the detachable connec-tions which have been common to the type and which limit the numberof revolutions which can be made per minute to about 100. Anotherproperty exacted by the variable nature of electric and cable railwaywork is the ability to cut off through a long range of the stroke instead alluded to, to avo
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
