. The Street railway journal . where the overhead wire is above the track and the bow rubsbeneath the wire. The great laxitude of this apparatus withreference to the position of the contact wire can readily be seen. It is only necessary in order that a contact shall be madethat the line intersects the surface generated by the collectingstem in its rotation from o to 180 degs. However, to aug-ment still further the extreme limitations of position in spacefor the contact wire, the apparatus is mounted on a parallellinkage by means of which the position at the center of rotationof the contact ste
. The Street railway journal . where the overhead wire is above the track and the bow rubsbeneath the wire. The great laxitude of this apparatus withreference to the position of the contact wire can readily be seen. It is only necessary in order that a contact shall be madethat the line intersects the surface generated by the collectingstem in its rotation from o to 180 degs. However, to aug-ment still further the extreme limitations of position in spacefor the contact wire, the apparatus is mounted on a parallellinkage by means of which the position at the center of rotationof the contact stem can be moved up or down. This is dis-played in Fig. 5 and Fig. 6, in which two sets of two contactorsare shown, both of which can be placed in service and allowthe car to run from one section on to another without anarc on the contact wire. The lateral displacement of the par-allel linkage-mount can be effectively controlled by the handor by means of compressed air, as shown in diagram in Fig. FIG. 13.—VIEW OF AERIAL CONSTRUCTION OF SINGLE-PHASE RAILWAY FIG. 8.—ARRANGEMENTS OF CONTACT WIRE IN VARIOUS CASES under the control of the motorman. By operating this chainthe contact stem can be lifted from the wire and placed out ofcommission. This apparatus is shown in diagram in Fig. 2,the chain being numbered 35, the lever 3 and the porcelainknob raised. Fig. 3 shows a number of diagrams which display the va-rious positions that the overhead line may have with referenceto the collecting device. The first cut shows the normalposition. The contact wire is arranged outside the profileof the car where there is a free space of about meters. This lateral displacement of the current-collecting device isnecessary only in traversing tunnels on a double track, and itis possible to effect this automatically on entrance and exitto the tunnel. This can be done most simply by means of abar suitably placed on the track which engages with a mechan-ism under the car at different height
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
