Identifier: streetrailwayjo281906newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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HE TEST RECORD are mounted upon these sectors and wires passed aroundthese pulleys, and pulleys on the plate of the instrumenttransmit the ^notion of the sectors to the pencil holders whichare fastened to the wire. This arrangement is constructedto be absolutely free of play or lost motion of any kind. Thewire is steel piano wire, and its extremities are fastened tothe sectors by screws when the wire has been drawn taut.The wire is passed twice around the pulleys so as to obtaingood bearing surface. The diameter of the sector pulleys 38o STREET RAILWAY JOURNAL. (Vol. XXVIIL No. io. varies, depending upon the amount of distance to be movedover by the recording pencil. Referring to Fig. 4, the largestpulley on the sectors records current, to its side is the speedrecording sector, and opposite is the line voltage sector. Mounted upon the bed plate of the instrument are tworelays, equipped with pencil holders. One of these relaysrecords wheel revolution, being connected in series with six
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FIG. 8.—BEFORE THE TEST OF THE CONEY ISLAND EXPRESS cells of a dry battery and a contact maker mounted upon thetrailer truck. The other relay records half-seconds, beingconnected in series with three dry battery cells and an electrictime contact. The time contacts are made by platinum con-tacts, one of which is mounted upon the balance arm of aSeth Thomas clock, the other contact being mounted upon theretaining case of the clock. One terminal of the battery cir-cuit is grounded on the casing of the clock. As the balancearm of the clock moves to and fro it closes the circuit at half-second periods. The platinum contacts are one-half inch inlength, and are carefully adjusted so as to make contact onlyin one spot and not to be so rigid as to stop the motion of theclock. A little care in adjustment results in a very satisfac-tory performance of the clock. The clock is then adjusted bymeans of a stop watch so that the regulator is in the properposition, in which place it is rigidly faste

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