A NEW OR IMPROVED ELECTRO-MAGNETIC INDUCTION MACHINE FOR DIVIDING A DIRECT CURRENT INTO ALTERNATE CURRENTS
Year: 1881

page_text: LETTERS PATENT to Lorentz Albert Groth, K.G.V., Civil Engineer and
Proprietor of the Scandinavian Patent Office, under the Firm of L. A. Groth
& Co., 97, Finsbury Pavément, London, E.C., for an Invention of "A NEW
OR IMPROVED ELECTRO-MAGNETIC INDUCTION MACHINE FOR DIVIDING A
DIRECT CURRENT INTO ALTERNATE CURRENTS." A communication from
abroad by Désiré Lachaussée, of Liège, in the Kingdom of Belgium.
PROVISIONAL SPECIFICATION left by the said Lorentz Albert Groth at the
Office of the Commissioners of Patents on the 24th June 1881.
LORENTZ ALBERT GROTH, K.G.V., Civil Engineer and Proprietor of the
Scandinavian Patent Office, under the Firm of L. A. Groth & Co., 97, Finsbury
Pavement, London, E.C. "A NEW OR IMPROVED ELECTRO-MAGNETIC INDUCTION
MACHINE FOR DIVIDING A DIRECT CURRENT INTO ALTERNATE CURRENTS."
A communication from abroad by Désiré Lachaussée, of Liège, in the Kingdom of
Belgium.
This machine is composed essentially of two plates of magnetic metal or alloy
which serve as bases to a certain number of electro magnetic bobbins placed side
by side, but in such a way that a bobbin taken separately always offers a polar
surface of opposite kind (antinome) to that of its two neighbours, and even if
necessary to that which is opposite to it in the other plate.
These two plates which are very heavy and move with the axis of rotation form
fly wheels, and thus furnish their contingent of regularity in the distribution of
the induction current. They are placed at a distance from one another and
separated by a fixed drum, in the thickness of which are placed any suitable
number of metalic spirals of small thickness, but of a diameter sensibly equal to
that of the electro magnetic bobbins.
The induced bobbins of the drum may be removed from their places, each of
them being contained in a wooden or other box and carried by a support of gun

page_text: metal, brass, or other metal, as non magnetic as possible, in such a manner that each
bobbin may be taken out of the machine even while it is working.
This arrangement allows of constantly verifying the state of each of the parts
susceptible of heating, of changing the bobbins instantly without stopping, and of
leaving the machine only the number of elements necessary for the desired number
of lights, and thus to reduce the motive power proportionately to the required
production of electricity.
The spirals are composed of a certain quantity of metal in wires or strips wound
round a very sub-divided magnetic material, or even wound simultaneously on the
wires or strips.
They have no retaining rings in order to avoid the unutilized effects of induction,
which are hurtful, as they heat up the apparatus.
These spirals are each independant of its neighbour, they may either receive
separate rheophores, or one, two, or several common rheophores in such a manner that
they may be all put in tension one upon the other, or employed separately. For this
purpose all the ends of the wire spirals are connected to small terminals, parallel to
which are placed large terminals which serve to connect these to one or more
general or return wires, and allow of grouping the currents in tension or in
quantity even when the machine is working, without changing in any way the
general arrangement of the machine.
Finally, with this system it is only necessary to have spare bobbins in order to
obviate all inconveniences in case of heating or for obtaining lights of different
intensities or of greater tension, which is indispensable when it is desired to carry
the light to a great distance from the electric source, or to alter the arrangement of
burner.
The advantages effected by this Invention are,―
1. That all the luminous points are independant of one another, and that
consequently the irregularity of combustion of one of them, or its extinction,
cannot effect in any way the working of the others.
2. That on one and the same machine there may be a great variety of lights of
various powers or tensions.
3. That the number of lights may be reduced as required without injury to
the efficient working of the machine, and the motive power may be thus
economized.
4. That it is only necessary to have spare bobbins in order to fulfil all
requirements.
5. That the machine does not heat to an injurious extent, that it works
regularly and takes very little power, because the power stored up in the plates
and the speed with which they pass in front of the magnetic points, which are very
close to one another, lowers the effort produced by the passage of the bobbins in
front of the same magnetic points.
6. That the form of the machine allows of its being made very strong, no detail
being presented externally which can deteriorate, and that the machine occupies
little space compared with the number of lights produced by it.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Lorentz Albert Groth in the Great Seal Patent Office on the
23rd December 1881.
LORENTZ ALBERT GROTH, K.G.V., Civil Engineer and Proprietor of the
Scandinavian Patent Office, under the Firm of L. A. Groth & Co., 97, Finsbury
Pavement, London, E.C. "A NEW OR IMPROVED ELECTRO-MAGNETIC INDUCTION
MACHINE FOR DIVIDING A DIRECT CURRENT INTO ALTERNATE CURRENTS."
A communication from abroad by Désirée Lachaussée, of Liège, in the Kingdom of
Belgium.
The Drawings illustrate an electro. magnetic induction machine constructed in
accordance with this Invention.
Fig. 1 is a front view, partly in section, and Fig. 2 a side view, showing the
principal parts also in section.
:
This machine is composed essentially of two plates A and A' of magnetic metal
or alloy, which serve as bases to a certain number of magnetic bobbins B placed
side by side, but in such a way that a bobbin taken separately always offer a polar
surface of opposite kind (antimone) to that of its two neighbours, and even if
necessary to that which is opposite to it in the other plate.
These two plates, which are very heavy, and move with the axis of rotation C,
form fly wheels, and thus furnish their contingent of regularity in the distribution
of the induction current. They are placed at a distance from one another, and
separated by a fixed drum D, in the thickness of which are placed any suitable
number of metallic spirals E of small thickness, but of a diameter sensibly equal to
that of the electro magnetic bobbins.
The induced bobbins of the drum may be removed from their places, each of
them being contained in a wooden or other box, and carried by a support of gun
metal, brass, or other metal, as non magnetic as possible, in such manner that each
bobbin may be taken out of the machine even while it is working. This is seen
clearly in Figure 1, which shews both the bobbin E complete in place, and also this
same place when the cover is removed. The same Figure also shews the rubbers
by which the current is taken off.
This arrangement allows of constantly verifying the state of each of the parts
susceptible of heating, of changing the bobbins instantly without stopping, and of
leaving in the machine only the number of elements necessary for the desired
number of lights, and thus to reduce the motive power proportionately to the
required production of electricity.
The spirals are composed of a certain quantity of metal in wires or strips, wound
round a very subdivided magnetic material, or even wound simultaneously on the
wires or strips. They have no retaining rings, in order to avoid the unutilized
effects of induction, which are hurtful, as they heat up the apparatus.
These spirals are each independant of its neighbour; they may either receive
separate rheophores, or one, two, or several common rheophores in such manner that
they may be all put in tension one upon the other, or employed separately. For
this purpose all the ends of the wire spirals are connected to small terminals F' to
F", parallel to which are placed large terminals G and G¹, which serve to connect
these to one or more general or return wires, and allow of grouping the currents in
tension or in quantity, even when the machine is working, without changing in any
way the general arrangement of the machine.
Finally, with this system it is only necessary to have spare bobbins in order to
obviate all inconveniences in case of heating, or for obtaining lights of different
intensities or of greater tension, which is indispensable when it is desired to carry

page_text: the light to a great distance from the electric source, or to alter the arrangement of
burner.
The advantages effected by this Invention are,-
1. That all the luminous points are independent of one another, and that conse-
quently the irregularity of combustion of one of them or its extinction cannot effect
in any way the working of the others.
2.) That on one and the same machine there may be a great variety of lights of
various powers or tensions.
3.) That the number of lights may be reduced as required without injury to the
efficient working of the machine, and the motive power may be thus economized.
4.) That it is only necessary to have spare bobbins in order to fulfill all
requirements.
5.) That the machine does not heat to an injurious extent, that it works
regularly and takes very little power, because the power stored up in the plates
and the speed with which they pass in front of the magnetic points, which are
very close to one another, lowers the effort produced by the passage of the bobbins
in front of these same magnetic points.
6. That the form of the machine allows of its being made very strong, no detail
being presented externally which can deteriorate, and that the machine occupies
little space compared with the number of lights produced by it.
Having now described the nature of the said Invention, and the manner in
which the same is to or may be carried into effect, I would have it understood that
what I claim is,-
The special arrangement of electro magnetic machines, wherein all the bobbins
are independent of each other, and so arranged that each of them may be put into
or taken out of the machine without interfering with the others, whereby the
beforementioned advantages are realised, as herein before described and illustrated
in the Drawings hereto annexed.
In witness whereof, I, the said Lorentz Albert Groth, have hereunto set my
hand and seal, this Twenty second day of December, in the year of our
Lord One thousand eight hundred and eighty one.
TADEN
ITDRDE
CROTI