IMPROVEMENTS IN INDUCTION APPARATUS
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by John Henry Johnson at the Office of
the Commissioners of Patents on the 24th December 1878. A communication
from abroad by Augnste de Meritens, of Paris, in the Republic of France,
Engineer.
JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman. "IMPROVEMENTS IN INDUCTION APPARATUS." A communication from
abroad by Auguste de Meritens, of Paris, in the Republic of France, Engineer.
This Invention relates to an improved induction apparatus, whereby the
difficulties attending the division of the electric current are entirely obviated.
In carrying out this Invention a current of electricity obtained from any suitable
generator capable of producing alternating currents is caused to pass in a con-
tinuous manner through the two coils of an inducting electro magnet, which is
formed of thick wire wound round central cores. These cores are comprised of
bundles of fine wire encased in a sheath of thin sheet iron, and are connected
together at one end by a piece of soft iron, which is formed with a cylindrical hole
at each end, bored and turned, of somewhat smaller diameter than the cores; and
after being heated to redness is shrunk on to the ends of the coils, so as to form one
solid piece with them.
Another electro magnet, having cores connected by a piece of soft iron, and
precisely similar to the one herein before described, excepting that it is provided
with coils of comparatively fine wire, is placed with its poles exactly opposite the
poles of the electro magnet first described, from which it is only separated by a
thin slip of brass.
By this arrangement when a current passes in the coils of the electro magnet first
herein-before described, and the poles of the said electro magnet are magnetized,
the poles of the second electro magnet will be magnetized also, but in a different
manner; the poles of the second will be north and south, whilst the poles of the
first will be south and north.
As the alternate current from the generator passes continually through the coils
of the first electro magnet an induced current will be continually circulating in the
coils of the second electro magnet, which may be utilized at the ends of the wire

page_text: composing the said coils independently of the magnet or dynamo-electric machine
employed.
Any desired number of such induction apparatus may be connected together
according to the dimensions of the luminous are to be produced at the extremities
of the wire receiving the induced current in such a manner as to augment either
the tension or quantity of the current.
Moreover as the entire current from the generator only has to overcome the very
small resistance of the thick wire on the cores of the magnet hereinbefore described,
in lieu of the very great resistance of the luminious arcs, it is enabled to travel over
an incomparably longer circuit, and at the same time to supply a larger number
of lights of equal intensity than is possible according to the system heretofore
employed.
In lieu of dividing the current produced by the generator into a certain number
of circuits a single circuit may be employed, which will then be of considerable
quantity as well as tension, and which if required may be caused to travel all over
a town.
In this case all the advantages of employing a thick conducting cable will be
retained, as there will be no solution of continuity in the current which it conveys,
such current being kept quite distinct, so that by employing a conducting cable and
wire for forming the inducting coils of suitable diameter the light may be produced
at any desired distance. This distance may be still further increased by employing
bar electro-magnets as inductors, that is to say, electro magnets having a single
coil.
It is evident that by employing a single generator of electricity of sufficient
power, a number of generators as large as desired with their currents combined, so
as to obtain a calculated tension and quantity, lights may be produced at any
required distance, say, five or six miles or more, not only along the public road but
also in all the floors of the adjacent houses.
The lighting or extinguishing of one or of any number of the burners in no wise
affects the working of the other burners whatever may be the total number
employed.
À large shop or establishment of any kind provided with a generator of electricity
may supply all its neighbours with the current within an extensive radius, and thus
effect a great reduction in the expense of its own lighting.
The cable which supplies all the burners of a circuit of any required length may
be carried from the generator to the most distant extremity of the circuit, at which
point it enters the ground and is soldered to the largest gas or water pipe in the
vicinity. The binding screw of the generator, corresponding to the inverse pole to
that from which the current passes into the cable on the circuit, is likewise placed
in communication with the largest gas or water pipe in its vicinity, so that all the
cost of a return cable is saved under the most favorable conditions for offering the
least resistance to the passage of the current.
It will be seen that in the induction apparatus constructed and arranged
according to this Invention the inducting current does not act upon an adjacent
wire but is employed entirely in magnetizing the cores of the first electro magnet,
and these by induction through a non magnetic partition magnetize the cores of
the second electro-magnet; and this latter magnetism produces the induced current
circulating in the coils of the last mentioned electro magnet.

page_text: PROVISIONAL SPECIFICATION left by John Henry Johnson at the Office of
the Commissioners of Patents on the 24th December 1878. A communication
from abroad by Auguste de Meritens, of Paris, in the Republic of France,
Engineer.
JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman. "IMPROVEMENTS IN INDUCTION APPARATUS." A communication from
abroad by Auguste de Meritens, of Paris, in the Republic of France, Engineer.
This Invention relates to an improved induction apparatus, whereby the
difficulties attending the division of the electric current are entirely obviated.
In carrying out this Invention a current of electricity obtained from any suitable
generator capable of producing alternating currents is caused to pass in a con-
tinuous manner through the two coils of an inducting electro magnet, which is
formed of thick wire wound round central cores. These cores are comprised of
bundles of fine wire encased in a sheath of thin sheet iron, and are connected
together at one end by a piece of soft iron, which is formed with a cylindrical hole
at each end, bored and turned, of somewhat smaller diameter than the cores; and
after being heated to redness is shrunk on to the ends of the coils, so as to form one
solid piece with them.
Another electro magnet, having cores connected by a piece of soft iron, and
precisely similar to the one hereinbefore described, excepting that it is provided
with coils of comparatively fine wire, is placed with its poles exactly opposite the
poles of the electro magnet first described, from which it is only separated by a
thin slip of brass.
By this arrangement when a current passes in the coils of the electro magnet first
herein-before described, and the poles of the said electro magnet are magnetized,
the poles of the second electro magnet will be magnetized also, but in a different
manner; the poles of the second will be north and south, whilst the poles of the
first will be south and north.
As the alternate current from the generator passes continually through the coils
of the first electro magnet an induced current will be continually circulating in the
coils of the second electro magnet, which may be utilized at the ends of the wire
D '
011

page_text: composing the said coils independently of the magnet or dynamo-electric machine
employed.
Any desired number of such induction apparatus may be connected together
according to the dimensions of the luminous arc to be produced at the extremities
of the wire receiving the induced current in such a manner so to augment either
the tension or quantity of the current.
Moreover as the entire current from the generator only has to overcome the very
small resistance of the thick wire on the cores of the magnet hereinbefore described,
in lieu of the very great resistance of the luminous arcs, it is enabled to travel over
an incomparably longer circuit, and at the same time to supply a larger number
of lights of equal intensity than is possible according to the system heretofore
employed.
In lieu of dividing the current produced by the generator into a certain number
of circuits a single circuit may be employed, which will then be of considerable
quantity as well as tension, and which if required may be caused to travel all over
a town.
In this case all the advantages of employing a thick conducting cable will be
retained, as there will be no solution of continuity in the current which it conveys,
such current being kept quite distinct. so that by employing a conducting cable and
wire for forming the inducting coils of suitable diameter the light may be produced
at any desired distance. This distance may be still further increased by employing
bar electro-magnets as inductors, that is to say, electro magnets having a single
coil.
It is evident that by employing a single generator of electricity of sufficient
power, a number of generators as large as desired with their currents combined, so
as to obtain a calculated tension and quantity, lights may be produced at any
required distance, say, five or six miles or more, not only along the public road but
also in all the floors of the adjacent houses.
The lighting or extinguishing of one or of any number of the burners in no wise
affects the working of the other burners whatever may be the total number
employed.
A large shop or establishment of any kind provided with a generator of electricity
may supply all its neighbours with the current within an extensive radius, and thus
effect a great reduction in the expense of its own lighting.
The cable which supplies all the burners of a circuit of any required length may
be carried from the generator to the most distant extremity of the circuit, at which
point it enters the ground and is soldered to the largest gas or water pipe in the
vicinity. The binding screw of the generator, corresponding to the inverse pole to
that from which the current passes into the cable on the circuit, is likewise placed
in communication with the largest gas or water pipe in its vicinity, so that all the
cost of a return cable is saved under the most favourable conditions for offering the
least resistance to the passage of the current.
It will be seen that in the induction apparatus constructed and arranged
according to this Invention the inducting current does not act upon an adjacent
wire but is employed entirely in magnetizing the cores of the first electro magnet,
and these by induction through a non magnetic partition magnetize the cores of
the second electro-magnet; and this latter magnetism produces the induced current
circulating in the coils of the last mentioned electro magnet.