31
RAIL Friction Machine.
65. Of the devices used on the track, the only one which requires,
special mention is shown in Fig. 19. This machine measured the force
required to move or keep moving a block of tire steel resting upon the
rail. The pressure of this block on the rail could be varied by means
of weights of 20, 40, 60, 80 and 100 pounds. Readings were taken
with each of these weights and the coefficient recorded is the average
of the five readings.
Fig. 19.
RAIL FRICTION MACHINE.
This apparatus was used on one of the rails of the test track.