Evening star. [volume] (Washington, D.C.) 1854-1972, 1879-09-16
The Latest Use 20 which Elccsracsev
Has been Put.

MANY attempts have been made TO apply the
Mot!ve power obtained from electricity TO the
working or locomotives but no satisfacf0rv
result was obtained. However, a step forward
Das peen made In this direction In Berlin with
appaienI success. There are two lines OF rails
lald down, which. as in a narrow-gauge line
leturn INTO themselves In a ring shaped curve.
!. ne iehg,n Is ABOUT 300 meters. In the middle
is an isolated third line, consisting OF an I'M
right continuous iron plate The locomotives
carries two rollers with which tt stands in
connection with the Isolated middle line The
essential portion OF the locomotive A. formed
by an electro-dy namical machine, one pole of
which is connected with the middle line. ana
the other with the pair OF outer rails. through
the outer wheels. similarly the machine which
produces the current stands In the machine
room In connection through one pole with the
middle line and through the other role with the
outer pair OF rails When, therefore, the dy-
namical machine in the locomotive is on the
railway the electric current produced IN the
machine soon runs through IL and causes IL TO
rotate and TO impart its rotary motion TO the
wheels OF the locomotive. and the latter con-
unueS 10 move until the current IS inter.
rupted. Even an imperfect state OF isolation
on the part OF the rails does not materially
affect the action OF the machine. When the
locomotive Is moving, It's conducting wires
folm much better conductors than the damp
earth. III the. current is Interrupted, the
damp ground Is not sufficient conductor to
keep the dynamo-electrical action going The
MAJ netism OF the machines producing the cur
rent consequently disappears, and the result IS
that The subordinate stream through the earth
also interrupted. great advantage is pos
sc0scu ny ine TRANSMISSION OF electric force
from me fact the locomotive, whether moving
slowly or quickly, always works I'D TO It's full
poNer-an effect which has hitherto been an
unSolyeo problem In mcrchanics. When the
machine that gives the power has 10 do much
work ana so goes slowly, the counter-currents
tproduces are also CORRESPONDENCE weak and
the current through the conductors thereby
uIdergoes an increase In strength 70 a similar
extent. BY this means the electromagnetic.
and corresponding TO this, the attractive power
or the machine, are increased The dynamo-elec-
tic locomotive has the further advantage that ft
carries In Itself the power which can be en-
poyed as brake, fnasmuch as IL becomes
itself the primary or current producing machine
when ii rotates more rapidly than the actual
the electric locomotive 10 the Berlin Exhibi.
ton, II must be remembered that ft was not
constructed Tor tie purpose TO which ft has
been applied-that Is TO propel the three ele-
CANT little passenger carriages which are
attached TO IL. Each carriage holds from
are drawn in from one to two minutes
round the circular railway of 800 m tres
in length. The locomotive was originally
MADE FOR the purpose OF drawing up
Goals out OF the pit. Nevertheless. its perform.
ances are very remarkable, and render &c GER
tain that there are many cases IN which cleo
TIC locomotives may be employed with ad.
vantage. The question OF the extent 10 which
eiectro-dy manic locomotives may possibly be
employed is as yet difficult to decide Apart
from the question OF the possibility OF a SUI.
hcient Isolation, IL depends On the conductive
resistance OF the rails. According TO DR.
SiemenS view, this requisite on long RAILWAYS
to time new primary dynamo-electrfc machines,
which would maintain the necessary electric
tension between the middle and the outer rails
tGdttgndnf's Messenger.