. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . curelyfastened to the running board of the car, and in such a positionas to bring the contact breaker arm P just outside the rail, andits extremity about one-fourth inch below the head of the rail. The mechanism was mounted upon a block A made of one-inch white pine. It consisted essentially of a hickory arm P,pivoted at D, on a one-fourth inch bolt, and held in its normalposition by the spiral springs S S, and the wooden guide G. The arm P was partially covered with sheet brass B, whichser
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . curelyfastened to the running board of the car, and in such a positionas to bring the contact breaker arm P just outside the rail, andits extremity about one-fourth inch below the head of the rail. The mechanism was mounted upon a block A made of one-inch white pine. It consisted essentially of a hickory arm P,pivoted at D, on a one-fourth inch bolt, and held in its normalposition by the spiral springs S S, and the wooden guide G. The arm P was partially covered with sheet brass B, whichserved to conduct the current. This brass covering was con-nected to one side of the relay circuit through the bolt D, and 206 ELECTRIC RAILWAY TEST COMMISSION through a strip of brass fastened to the inner side of the guideG. The connection to the other side of the circuit was made bymeans of the contact C, which consisted of a sheet of brasssprung into grooves cut in the block A. The guide G was held in place by two bolts h h, provided withthick felt washers F F, and sheet brass washers d d. The felt. Fig. 55. —Contact Device for Distance Measurements. Acceleration Tests. washers served the double purpose of holding the guide at theproper distance from the block and of deadening the blow of thearm P. They also aided the springs S S in restoring the arm toits normal position. The brass washers protected the v/ood andserved as a fastening for the springs S S. The device was operated by wickets made of steel wire, anddriven into the ties at certain intervals along the track. One ofthese wickets is shown at W. These wickets or trippers were ACCELERATION TESTS OF A CITY CAR 207 placed close together at the end of the track from which thestarts were made, in order to give fairly uniform time intervals,thus insuring accuracy throughout the entire distance. Fig. 56 shows in detail the connections used with this appa-ratus, the circuit breaker being indicated at K. When the cir-cuit is
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