10 POWER DISTRIBUTION FOR ELECTRIC RAILROADS.
each of the uniform sections to be o0.05 ohm. The first
section carries the whole 200 amperes, and the drop C R is
10 volts. ‘The second section carries but 180 amperes, and
the loss is g volts, and so on, until the tenth section carries
20 amperes, and the loss has diminished to 1 volt.
Mapping these successive falls of potential on Fig. 6,
the curved line, C D, is formed, showing the consecutive
C
500
Pressure — Volts.
Loss in line — Volts.
B
0 1 2 3 4 5 6 7 8 o 10
Points on line Street Ry. Journal
FIG. 6.
values of the potential on A B. C E, a prolongation of
the drop in the first section, shows the result of concen-
trating the whole load at B. : :
In such a uniformly loaded line the drop is found as
follows : If C is the total current and there are 7 sections
in the line, then C is the current taken off for each sec-
7