. Electric railway gazette . supposed to be con-stant, but unfortunately varies within a wide range. The weight of the car and load, the wheels, theirshape and age, the car journals, the shape of thetrack, its surface, whether wet or dry, smooth or rough,dirty or sandy, degree of curvature of the track andshape of the groove, switches, crossings, etc., all have the passengers on special tests was actually determined!but on tests during the regular service of the car were esti-mated, but this latter weight did not enter materially inthose tests as no computations based-on the weight weremade ;
. Electric railway gazette . supposed to be con-stant, but unfortunately varies within a wide range. The weight of the car and load, the wheels, theirshape and age, the car journals, the shape of thetrack, its surface, whether wet or dry, smooth or rough,dirty or sandy, degree of curvature of the track andshape of the groove, switches, crossings, etc., all have the passengers on special tests was actually determined!but on tests during the regular service of the car were esti-mated, but this latter weight did not enter materially inthose tests as no computations based-on the weight weremade ; whenever necessary the weights are correct with-in a few pounds. The electrical measurements were made with Westoninstruments, the watt-hours were determined by means August 31, 1895. ELECTRIC RAILWAY GAZETTE. 133 of a portable Thomson recording wattmeter, the speedrecords by a Boyer speed recorder, the draw-bar pull bya Giddings recording dynamometer, and the time read-ings were taken with calibrated watches or with a chro-. FIG. 4.—NEW TRACK AT THE PER CENT. GRADE. nometer. All of these instruments were carefully cali-brated as often as necessary and the readings correctedaccordingly. The wattmeter, speed recorder and dyna-mometer were kindly loaned for use during these testsby the railway department of the General Electric Com-pany. The poles over the entire route were numbered,thus enabling the cars to be located with sufficient accu-racy, and readings were taken, when necessary, at everypole, which was with sufficient frequency for the pur-pose. Whenever necessary the same motormen wereused, and in every case men were chosen who had provedthemselves to be reliable and steady operators. In thecase of tests made during regular service, no select on ofmotormen was made. These tests were begun in the Spring of 1894 and con-tinued at intervals until the Fall of i895. For the con-ditions given the results can be taken as correct within afew per cent., but it must be borne
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
