for use, the cheeks being also provided with studs for the attachment of
leather straps hooked on to the framework of the car, one for the forward
and one for backward movement of the collector. These straps are strong
enough for the ordinary haulage of the collector, and for the removal of
pebbles and dirt that may get into the slit; but should any absolute block
occur then they break and the terminal is withdrawn from the clip; the
electric contact being thereby broken the car stops, the obstruction can
then be removed and the collector reconnected without damage and with
little delay.

[Illustration: FIG. 5]

In order to secure continuity of the center rail throughout the length of
the track, and still provide for the removal of the collector at frequent
intervals, the framework of the collector is so made that, by slackening
the side-bolts, the steel plates can be drawn upward and the collector
itself withdrawn sideways through the hand holes, one of the half-tubes
being removed for the purpose.

Fig. 6 illustrates another arrangement that I have constructed, both of
collector and method of collecting.

[Illustration: FIG. 6]

As before mentioned, the arrangement now described has been carried out in
a field near the works of Messrs. Smith, Baker & Co., Cornbrook Telegraph
Works, Manchester, and its working efficiency has been most satisfactory.
After a week of rain and during drenching showers the car ran with the same
speed and under the same control as when the ground was dry.