. Report of draft gear tests, United State Railroad administration, Inspection and test section; . Fie. 49—Instrument on Car B for Recording Draft Gear Action Draft Gear Tests of the U. S. Railroad Administration 91. Fig. 51—Seismocraph of Car A tion or acceleration of the cars will causethe pendulums to swing upward by virtueof the inertia of their own masses. Gradu-ated quadrants are arranged as guides forthe pendulum weights, and a light frictionrunner is carried with the weight and isleft standing upon the guide at the highestpoint reached by the pendulum. Thegraduations are proportional t
. Report of draft gear tests, United State Railroad administration, Inspection and test section; . Fie. 49—Instrument on Car B for Recording Draft Gear Action Draft Gear Tests of the U. S. Railroad Administration 91. Fig. 51—Seismocraph of Car A tion or acceleration of the cars will causethe pendulums to swing upward by virtueof the inertia of their own masses. Gradu-ated quadrants are arranged as guides forthe pendulum weights, and a light frictionrunner is carried with the weight and isleft standing upon the guide at the highestpoint reached by the pendulum. Thegraduations are proportional to the verti-cal lift of the pendulum. Thus when theregistration is the pendulum hasreached a vertical displacement twice asgreat as when the registration is Aphotographic reproduction of the seismo-graph of car A is shown in Fig. 51. Theseismograph records are usually attractiveto the observer but are not of great im-portance in the study of gears. This isdue primarily to the fact that the sides ofthe car have some movement with respectto the center of the entire mass. The quickvibrations of the side of the car appearalso to influence the seismograph instruments are frequently spoken
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Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1920, bookyear1921
