. Electric railway journal . in order to calculate fluxes are as follows: Table I—Comparison of Calculated and Measured Fluxes in Megalines per 1000 Track per 1000 Amp. in Third-Rail Location of Flux FluxMeasuredin Test Flux Calculated fromAssumption Discrepancies, in per Cent. 1 3 1 2 3 Third rail head Rails 3-2 !!0 .18 ++ Rails 3-1 Rails 2-1 f. As the general shape of the rail section is that oftwo sectors of a circle, diametrically opposite, the cross-section can be assumed to be as i
. Electric railway journal . in order to calculate fluxes are as follows: Table I—Comparison of Calculated and Measured Fluxes in Megalines per 1000 Track per 1000 Amp. in Third-Rail Location of Flux FluxMeasuredin Test Flux Calculated fromAssumption Discrepancies, in per Cent. 1 3 1 2 3 Third rail head Rails 3-2 !!0 .18 ++ Rails 3-1 Rails 2-1 f. As the general shape of the rail section is that oftwo sectors of a circle, diametrically opposite, the cross-section can be assumed to be as in A, Fig. 1. As theiron portion of the circular flux path is relatively small,in calculating the flux within the cylinder the per-meability may be considered unity. 2. The cross-section was assumed that of a cylinderas in B, Fig. 1. 3. The cross-section was assumed equal to that of twocylinders located as in C, Fig. 1. It was also assumed that the surfaces of equal mag-netic potential were cylinders whose axes were coinci-. liail Rail INDUCED VOLTAGE IN THIRD RAIL FIG. 2—DIAGRAM OF RAIL AND TEST COIL ARRANGEMENT dent with the axes of the rails. The fluxes calculated onthe basis of the foregoing assumptions and with the railarrangement indicated in Fig. 2 are tabulated in Table[. The rails weighed 55 lb. per yard, were 4 in. highand had a cross-section of sq. in. Measurement of Actual Fluxes The actual fluxes were measured by means of testcoils, arranged as in Fig. 2, and a ballistic rail circuit is shown in Fig. 3. For the purpose of Generator
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