. The Street railway journal . politan District Railways, leaves muchto be desired in the way of standard construction. The ques-tion of uniformity in the location of the conductor rail is ap-parently a matter largely determined by local or existing con-ditions, and unfortunately is no nearer solution in Great Brit-ain than in the United States or on the Continent. Two insu-lated conductor rails, positive and negative, are used per track, 416 STREET RAILWAY JOURNAL. [Vol. XXV. No. 9. the former being placed 16 ins. outside the running rail andthe negative centrally between the track rails. The
. The Street railway journal . politan District Railways, leaves muchto be desired in the way of standard construction. The ques-tion of uniformity in the location of the conductor rail is ap-parently a matter largely determined by local or existing con-ditions, and unfortunately is no nearer solution in Great Brit-ain than in the United States or on the Continent. Two insu-lated conductor rails, positive and negative, are used per track, 416 STREET RAILWAY JOURNAL. [Vol. XXV. No. 9. the former being placed 16 ins. outside the running rail andthe negative centrally between the track rails. They are 3 ij4 ins., respectively, above the running rails. A 100-lb. T-section, with an extra broad and thick base, isused for the conductor rails on the District Railway, while asection similar to that designed by W. B. Potter, of the GeneralElectric Company, is used for the Tube Railways. The lat-ter is of rectangular section, with dove-tails at the bottom, andweighs 85 lbs. per yard. The dove-tail or V-groove constru-. NEGATIVE MAIN FIG. 65—TWO RELAY CIRCUITS OF ELECTRO-PNEUMATICSIGNALING tion provides an easy and satisfactory method of securing therails by a special design of fish-plates. The resistance is guaranteed to be not more than timesthe equivalent section of copper; the chemical constitutionnecessary to obtain the above figure is about as follows: Carbon OS Manganese 19 Sulphur 05 Phosphorous 05 Silicon 03 Individual analyses and tests of these rails show essentiallythe results as above given, and that they are easily the bestelectrical conductors of some forty-five samples tested in thelaboratory of the General Electric Company,the results of these tests having been given ina paper presented to the New York meetingof the American Institute of Mining Engineersby J. A. Capp, Oct. 15, 1903 (see Street Rail-way Journal, Oct. 24, 1903). From actualtests it was found that the relative resist-ance of this conductor rail, six months afterbeing bonded and ready
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
