27
62. Telephones connected this cabin to two other cabins located
1,200 and 3,600 feet, respectively, from the zero circuit breaker, and were
used by the men on the test track.
63. The coefficient of friction between the rail and a block of
tire steel was obtained at intervals during each day, by means of an
apparatus shown in Fig. 19.
Fig. 13.
DISTANCE RECORDER.
This instrument was mounted on the locomotive and connected to the front truck axle. It was used in
connection with the wheel sliding indicator.
64. Observations were also taken of the atmospheric temperature
and of the relative humidity from the readings of an hygrometer which
consisted of wet and dry bulb thermometers.