Improvements in the Electric Lighting of Railway Trains.
Year: 1885

page_text: Improvements in the Electric Lighting of Railway Trains.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention a communication to me
from abroad by the Electrotechnische Fabrik Cannstatt of Cannstatt through their
Agents Wirth and Company of Frankfort on the Main both in Germany, to be as
follows:-
In the electric lighting of railway trains by the use of a dynamo machine driven
from the wheel axle for supplying the lamps and accumulators when the speed of
the train exceeds a certain minimum and by the use of the accumulators alone for
supplying the lamps when the speed of the train falls below that minimum, a very
exact regulation of the dynamo machine is required, either for the purpose of
obtaining a velocity of the dynamo or for obtaining a constant electric current
with a variable velocity of the dynamo, when a constant light is required.
The following arrangement avoids all these difficulties
Two series of accumulators are used of which one is connected with the dynamo
machine driven by the wheel axle as soon as the speed of the train exceeds
a certain minimum, whilst the other series of accumulators supplies the. lamps.
When the tension of the latter series falls below a certain limit, the accumulators
are caused to change places the first series being switched into the lamp circuit and
the others into the circuit of the dynamo, this switching being effected either by
hand or automatically by means of solenoids with cores.
The velocity of rotation of the dynamo-machine can be rendered constant by
means of well known mechanism or when its velocity varies with the speed of the
train a constant current can be obtained by means of electric regulators such as a
solenoid with core or by means of a centrifugal regulator which interposes suitable
resistances in the electro-magnetic circuit.
It is immaterial whether the accumulators be placed all in the same compartment
or whether they are distributed in the different carriages for the independent
lighting of the latter,

page_text: I, ALEXANDER Melville Clark, of the firm of A. M. and Wm. Clark, of
.53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this Invention (a communication to me
from abroad by The Electrotechnische Fabrik Cannstatt of Cannstatt through their
Agents Wirth and Company of Frankfort on the Main both in Germany) and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:—
In the electric lighting of railway trains by the use of a dynamo-machine driven
from the wheel axle for supplying the lamps and accumulators when the speed of
the train exceeds a certain minimum, and by the use of the accumulators alone for
supplying the lamps when 'the speed of the train falls below that minimum, a very
exact regulation of the dynamo machine is required either for the purpose of
obtaining a constant velocity of the dynamo or for obtaining a constant electric
current with a variable velocity of the dynamo when a constant light is required.
The following arrangement avoids all these difficulties ;-Two series of accumu-
lators are used, of which one is connected with the dynamo machine driven by the
wheel axle as soon as the speed of the train exceeds a certain minimum, whilst
the other series of accumulators supplies the lamps. When the tension of the
latter series falls below a certain limit, the accumulators are caused to change
places, the first series being switched into the lamp circuit and the others into the
circuit of the dynamo, this switching being effected either by hand or automatically
by means of solenoids with cores. The velocity of rotation of the dynamo machine
can be rendered constant by means of well known mechanism, or when its velocity
varies with the speed of the train a constant current can be obtained by means of
electric regulators such as a solenoid with core, or by means of a centrifugal
regulator which interposes suitable resistances in the electro magnetic circuit. It
is immaterial whether the accumulators be placed all in the same compartment, or
whether they are distributed in the different carriages for the independent lighting
of the latter.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed, I declare that what
I claim is ;-
1. In the electric lighting of railway trains, the employment of two, or more,
series of accumulators in such manner that one or more are being charged by the
dynamo-machine driven by the wheel axle, whilst the lamps are worked by means
of other series of accumulators and conversely as specified.
2. Obtaining a constant current either by means of solenoids with cores, or by
electro-magnets, or partly by means of a centrifugal regulator, in the manner
specified, from a dynamo-machine having a variable velocity.
TEAL JT..1.. 190A