Friction coefficients of brake linings . were then connected by straightlines between the points making one long curve. When the compressiorof the spring was read on the hand wheel the point on this curve waswas located by going horizontally from the ordinate axis until thecurve was reached. From this point by going directly downward tothe axis of abscissa the force which caused the compression could bedirectly read on this axis. This tnen was the value K that we want-ed to find in equation (13) in the discussion of the theory. hen a reading had been taken the breke was again releasedand the r
Friction coefficients of brake linings . were then connected by straightlines between the points making one long curve. When the compressiorof the spring was read on the hand wheel the point on this curve waswas located by going horizontally from the ordinate axis until thecurve was reached. From this point by going directly downward tothe axis of abscissa the force which caused the compression could bedirectly read on this axis. This tnen was the value K that we want-ed to find in equation (13) in the discussion of the theory. hen a reading had been taken the breke was again releasedand the rider brought back to zero and the position of the hand wheelagain noted as the zero position for the next reading. This wasnecessary for, unless the brake was released immediately upon takinga reading the lining would often wear off from one-half to two-thousandths of an inch and to assume that the position of the hand -17- Compression inches 0r42S o,*foo 0J7S 0JO0 -For mm. 40 so 120 Force -/6s. 160 200 Z-40 2B0 320 $eo 4oo U- OF I. S. ft. FORM 3 -18- wheel was the same for all of the zero readings, would introduceerrors in the results. Sometimes as much as two-hundredths of aninch would be worn off before the completion of the tests. The loads were increased by ten pound increments on thescales, beginning at ten pounds and going up to forty, fifty, oreven seventy pounds according as the linings were able to stand was taken not to get excessive pressures thus causing too muchheating. When a maximum had been reached the load was then shiftedback five pounds and then reduced by ten pound increments until fivepounds was reached. This method served as a check on the readings,the decreasing loads checking the increasing loads. It was thoughtthat this would also reduce to a minimum the effect of increase oftemperature with increasing pressures. To save time in calculating the tangential force
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