. The street railway review . Une shaft tocable drum shafts, with thepresent method of rope dri-ving, on account of the vary-ing length of the ropes, so to overcome this the ropedrivers instead of being made in the usual way, with 22groves, are made of two drums each with 11 grooves,with a compensating device interposed between eachpair. To each driving drum there is also attached apowerful (Weston Capen) friction clutch, of which theMessrs. Robert Poole & Son Company are the solelicensed manufacturers, thus enabhng almost any com-bination of driving to be done with either engine, regard-less
. The street railway review . Une shaft tocable drum shafts, with thepresent method of rope dri-ving, on account of the vary-ing length of the ropes, so to overcome this the ropedrivers instead of being made in the usual way, with 22groves, are made of two drums each with 11 grooves,with a compensating device interposed between eachpair. To each driving drum there is also attached apowerful (Weston Capen) friction clutch, of which theMessrs. Robert Poole & Son Company are the solelicensed manufacturers, thus enabhng almost any com-bination of driving to be done with either engine, regard-less of the other. The plant operates two cables, onerunning from the power house south and east, connect-ing with the main line at Fayette and Paca streets andreturn, the other running from the power house north- r)i7 ward to Druid Hill park, and the Druid 11 ill avenuepower house at Retreat street and return, forming aloop from Retreat street to Francis street, to Fultonavenue, to Pennsylvania avenue, to Retreat street. The. GOT THE THE CHURCH THAT former 21,333 ^^et long, the latter 4,000 feet long, totalweight about 59 tons. Both run at a speed of 12 milesper hour. The tension device deserves specialmention. On account of the shortrunways, the tension carriage had tobe specially designed to operate overthe entire length of track. After muchthought this was accomplished as shownby the cut. Two i j/^ wire ropes at-tached to a frame made of two I beamswell braced, mounted on truck axles,and carrying the tension sheave. Theseropes pass over 5-feet sheaves anddown into a pit around other sheavesattached to the weights which slide inperpendicular guides, and thence upand over the winding drums. The weights are made adjustable bya simple arrangement of hand winding mechanism is all placedunder the track and permits the ten-sion carriage to run freely over it. Itwas deemed advisable to have a uni-form tension on the cable, and at thesame time to have an arrangementtha
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
