. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . ds. The car body dynamometer was similar to that employedfor the vestibule except for the larger dash-pot, as already men-tioned. Pressure was transmitted from the flat car to the carbody through a system of levers somewhat similar to that alreadydescribed. The point of attachment in this case was the steej THE TEST CAR [LOUISIANA 621 frame forming a part of one of the safety locks. Figs. 181, 186,and 190 show the details of this attachment. A rod turnedperfectly smooth was carried through
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . ds. The car body dynamometer was similar to that employedfor the vestibule except for the larger dash-pot, as already men-tioned. Pressure was transmitted from the flat car to the carbody through a system of levers somewhat similar to that alreadydescribed. The point of attachment in this case was the steej THE TEST CAR [LOUISIANA 621 frame forming a part of one of the safety locks. Figs. 181, 186,and 190 show the details of this attachment. A rod turnedperfectly smooth was carried through two holes bored in thelarge wrought-irgn strap of the safety lock frame. The rod wasthreaded for a length of 4 in. inside the frame, and thisthread carried a tension nut which was screwed against a stiffspring mounted over the rod. The purpose of this spring wasto take up lost motion in the lever system. When the tensionwas on the rod, the tension nut was drawn down against an irontube w^hich was slipped loosely over the spring. The tensionrod was connected through links to a double hook w^hich w^as. Hg. 192.—Sketch Showing General Arrangement of Car Body Counterweight. connected to one arm of a bell-crank lever carried in a bearingbetween the center of the sills of the car body. The other armof this bell-crank lever transmitted the force through a link tothe short arm of a second lever, which was supported by bear-ings mounted beneath the sill. The long arm of this lever wasconnected directly to the tension rod of the dynamometer. Thegeneral arrangement of the dynamometer lever below the carfloor is shown in Figs. 181 and 186. The matter of counterweighting the car body in such a manneras to produce a steady pressure upon its dynamometer wasfound to be a most important matter. The counterweightlever shown in Fig. 192 was constructed to produce a pressureof approximately a thousand pounds against the dynomometer 522 ELECTRIC RAILWAY TEST COMMISSION at all times. The tension r
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