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Braking Efficiency Recorded
Page 121
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manufacturers of braking systems, 3irling, Ltd., Tyseiey, Birmingham, a special interest in deceleration Jing apparatus and have designed rtable instrument for measuring permanently recording braking ney.
own as the Girling recording ..:rometer, its operating principle is nely simple. A 1-in. steel ball is J. up a curved ramp by the ration applied, making electrical et at various points in its are of and causing a mark to be made se special sensitive paper. The ical circuit consists of a condenser is charged from two small 90-v. batteries and discharged by the contact of the ball on the curved ramp.
The instrument is placed on the floor of the vehicle under test, with the front panel facing to the rear. A lever on the front panel is raised and the vehicle is brought to a standstill. The lever is then lowered, moving the paper forward ready for the next test, exposing the result of the completed test and switching off the instrument.
Sufficient paper is contained for approximately 15,000 tests. In order to renew paper or batteries a securing screw in the bottom of the case is removed and the instrument slides forward out of the case.