. Brake tests; a report of a series of road tests of brakes on passenger equipment cars made at Absecon, New Jersey, in 1913 . Fig. 16. SLACK ACTION RECORDER. This instrument was used to record tlie extension and recoil of the drawbars or the motion between the cars. A typical record is shown in Fig. Fig. 17. instrument was located in the cabin alongside of the test track. It made a record of the opening ofthe track circuit breakers, and from this record the initial speed of the train and its deceleration during thestop were calculated. 30

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