. The Street railway journal . 1 1 1 : 1 1 1 1 11 1 1 \ \ 1 11 1 11 1- ⢠c K 1 , 1 1 1 /- 1 si , 1 i \\\ J 11 1 1 1 T 1 1 1 ! : : 1 r , 1 1 1 11 1 1 1â 1 1 1â , 11 1 â1âtâ1â1 1 11 1 1 1 FIG. IâPOCKET ACCELEROMETER-FIG. 2 FIG. 4.âRECORD OF ACCELEROMETER to the most minute details of locomotive and train order to obtain exact information concerning these details,most exhaustive tests are instituted, and for the proper carryingout of these tests new measuring instruments have been devised,both for indicating and recording the magnitude of the variousfunctions involved. In all rail
. The Street railway journal . 1 1 1 : 1 1 1 1 11 1 1 \ \ 1 11 1 11 1- ⢠c K 1 , 1 1 1 /- 1 si , 1 i \\\ J 11 1 1 1 T 1 1 1 ! : : 1 r , 1 1 1 11 1 1 1â 1 1 1â , 11 1 â1âtâ1â1 1 11 1 1 1 FIG. IâPOCKET ACCELEROMETER-FIG. 2 FIG. 4.âRECORD OF ACCELEROMETER to the most minute details of locomotive and train order to obtain exact information concerning these details,most exhaustive tests are instituted, and for the proper carryingout of these tests new measuring instruments have been devised,both for indicating and recording the magnitude of the variousfunctions involved. In all railway work, both steam and electric,the all-important factor to be considered is speed, and it is oftennecessary to secure accurate data in regard to the rate at whichthe speed changes under various conditions of equipment andoperation. To obtain the desired information from a continuousspeed record is generally as unsatisfactory as it is laborious,and various devices have from time to time been tried in order. FIG. 3.âRECORDING ACCHLHROMETER to secure direct readings of acceleration and retardation of mov-ing cars and trains. 2. The following seem to be the requirements to be met by apractical instrument of this class: (a) It should have no delicate moving parts. (b) It should be susceptible of accurate calibration, and thiscalibration should be permanent. (c) The reading scale should be sufficiently extended to renderthe readings reasonably accurate. * A paper presented at the New York meeting of the American Sociey ofMechanical Engineers, Dec. 3 to 6, 1901. although it has certain limitations, I believe it to be more gen-erally satisfactory under the various conditions of practical test-ing than any instrument of the kind heretofore used. The action of this instrument depends upon the inertia of asmall mass of mercury contained in a horizontal passage, theends of which are in communication with two short vertical col-umns of mercury. Thus, the flow induced in the ho
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
