Testing of Elevator Buffers by Electrical Means

The curves of figure 5 are typical of those obtainable by the electrical apparatus described. Inasmuch as the oil-pressure indicator was connected to the bottom of the buffer cylinder, there was a short time interval between the instant of maximum pressure as shown on the pressure gauge and the maximum deceleration. This time interval is that required for the high-pressure wave to travel through the oil from the piston to the gauge. This difference in time demonstrates the elasticity of the light transformer oil used. The accuracy of this method is satisfactory for all existing test codes.