. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . d its fulcrum is at the pin 3. Applying the formulagives 4500 pounds delivered at the pin 2. This 4500 pounds is trans-mitted to the lever F, which is of the class shown in C, Fig. 81, andits fulcrum is at the pin 6. Applying the formula gives 1500 poundsdehvered at the pin 4. This 1500 pounds is transmitted to thelever A, which is of the class shown in A, Fig. 81, and its fulcrum isat the pin 9. Applying the formula gives 6000 pounds dehvered tothe brake bea
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . d its fulcrum is at the pin 3. Applying the formulagives 4500 pounds delivered at the pin 2. This 4500 pounds is trans-mitted to the lever F, which is of the class shown in C, Fig. 81, andits fulcrum is at the pin 6. Applying the formula gives 1500 poundsdehvered at the pin 4. This 1500 pounds is transmitted to thelever A, which is of the class shown in A, Fig. 81, and its fulcrum isat the pin 9. Applying the formula gives 6000 pounds dehvered tothe brake beam at the pin 8. In a similar manner the other brake-beam pressures can be determined. In the figure, the calculationhas been carried through for both service and emergency appli-cations. AIR BRAKES 101 It is seen that 6000 pounds is transmitted to the middle of eachof the four brake beams. Each brake shoe will then receive a pres-sure of 3000 i)()unds. Since there are eight wheels, the total brakingpressure will be 8X3000, or 24,000 pounds. This total braking pres-sure must not exceed 70 per cent of the unloaded weight of the Fig. 83. Automatic Slack-Adjuster Automatic Slack=Adjuster. Full braking pressure will besecured as long as the maximum allowable brake-cylinder pressurecan be maintained. Since the brake-cylinder pressure dependsupon the length of stroke of the piston, it follows that the stroke of
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