. Official proceedings . 0 lbs. capacity car runs into a bump-ing post at a speed of eight miles per hour, the momentum de-stroyed must be 318,144 foot pounds. (See preceding table.) 16. If this car strikes another loaded car standing still. The Draft Gear. 55 th^ shock (considering an inelastic body) is only half as greatand the two cars will proceed at half the speed. I/. If the car runs into a loaded train standing still, theblow between the first two cars is just the same, after which theywill proceed at half the speed to hit the third car, etc. 18. Of course, the blow is always somewhat l
. Official proceedings . 0 lbs. capacity car runs into a bump-ing post at a speed of eight miles per hour, the momentum de-stroyed must be 318,144 foot pounds. (See preceding table.) 16. If this car strikes another loaded car standing still. The Draft Gear. 55 th^ shock (considering an inelastic body) is only half as greatand the two cars will proceed at half the speed. I/. If the car runs into a loaded train standing still, theblow between the first two cars is just the same, after which theywill proceed at half the speed to hit the third car, etc. 18. Of course, the blow is always somewhat lessened by^the amount the two adjoining gears transform into a gradualpush. This holds good for spring as well as friction only difference between the two is that the spring gears,after the main shock has passed, will open up again and causea back lash, while the friction gears are prevented from openingwith the same force as what they received in closing. 19. As far as the car is concerned, there is never any. 54 Proceedings Railway Club of Pittsburgh. energy absorbed, but as far as the gear in itself is concerned,part of the work it takes to close it is absorbed by abrasion onthe bearing surfaces and part of it is transformed into heat, justthe same as in grinding, or machining anything else. Mouicntuui Taken by the Draft Gear. 20. To comprehend more fully the details of operation ofan individual gear, tests made by the M. C. B. Committee inMay, 1902, have been chosen and shown in Fig i. The represent four typical draft gears, being the i—i, 2—2,6—I, and 7—7 tests, and in order to compare the performancesmore readil}, the diagrams have been drawn into each other. 21. To bring out still more the peculiarities of these dif-ferent gears, Table, Fig. 2, has been prepared, which is reallyself-explanatory. TfSI MOTION OF erETAR IN INCHETS. 1 . 2. -f fe a 1 0 12- 1 4- 1 <b 1 a 2 0 2 2 24 INCRWSf in presre for .2 TRAVEL T ^ooo 7 000 3 SOOO 40000
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