. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . 160 ELECTRIC RAILWAY TEST COMMISSION Over the paper was mounted, at right angles to its directionof motion, six round brass rods, R, R, etc. To these wereclamped the time marking devices, M, M, etc. These magnetswere provided with armatures mounted upon hinged arms andcarrying recording pens made of glass tubing drawn out topoints. It was convenient for this purpose to use the relaysmanufactured by the Electric Tabulating Machine Company, Fig. 49. — Diagram of Recotdinj Apparatus used
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . 160 ELECTRIC RAILWAY TEST COMMISSION Over the paper was mounted, at right angles to its directionof motion, six round brass rods, R, R, etc. To these wereclamped the time marking devices, M, M, etc. These magnetswere provided with armatures mounted upon hinged arms andcarrying recording pens made of glass tubing drawn out topoints. It was convenient for this purpose to use the relaysmanufactured by the Electric Tabulating Machine Company, Fig. 49. — Diagram of Recotdinj Apparatus used in Interurban Car Test. for use in their electric tabulating machines. These pensmarked the base lines for the various records. They were allconnected in series and in series also with the time marking de-vice of the deneral Electric recording ammeter, and all of themagnets were thus energized once every five seconds. Whenenergized in this manner, each pen made a mark upon the baseline corresponding to the impulse received. Upon the recordsheet were synchronized all of the records made by this means. SERVICE TESTS OF AN INTERURBAN CAR 161 Upon the rods, R, R, were also mounted sliding pen carriagesfor making the various records. These pen carriages were at-tached to points on the endless cords, B, B, which passed overdrums, D, D, carried upon the instrument cases and over ten-sion pulleys, P, P, clamped to the rods. For the cords, w-ell-stretched fish lines of good quality were found to be entirelysatisfactory. The tension pullej^s cons
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