Glow Lamps for Rotary-phase Currents.
Year: 1891

page_text: Date of Application, 22nd June, 1891
Complete Specification Left, 2nd Mar., 1892-Accepted, 9th Apr., 1892
[Communicated from abroad by Messrs. SIEMENS & HALSKE, of Berlin, in the
German Empire, Electrical Engineers.]
Glow Lamps for Rotary-phase Currents.
We, SIEMENS BROTHERS & CO. LIMITED, of 12, Queen Anne's Gate, West-
minster, in the County of Middlesex, Electrical Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to installations for the distribution of electric currents, in
which rotary-phase currents are employed, that is to say, wherein three or more
alternating currents have their phases displaced relatively to each other by equal
amounts.
Although this invention relates to all systems of such rotary-phase currents, in
the following only the case of three alternating currents whose phases are displaced
relatively to each other to the extent of an angle of 120°, will be considered.
If, for example, there are three conductors which carry the said rotary-phase
current, the current consuming devices can be arranged in two different ways
between the said three conductors; either the total number of such devices is
divided into three equal parts, and those belonging to one and the same group are
arranged parallel between two of the three conductors, as indicated at Fig. 5 of
the accompanying drawing, or the consuming devices belonging to each group have
their one pole connected with one of the said conductors, and all the free poles are
connected to one common point, as at Fig. 6.
Now, as it must be possible during the working to include or exclude at will any
of the consuming devices, differences in the load of the three conductors A B C
must unavoidably occur.
The present invention has for its object the construction of a glow lamp in such
a manner that the currents of all three of the conductors A B and C shall
simultaneously act thereon. Figs. 1 to 4 shew constructions of lamps for this
purpose.
The glass globe of the lamp is constructed in the known manner, the base thereof
however contains three electrodes a b c (or, in the case of a greater number of
conductors, a corresponding greater number) and the neck of the glass globe has
the same number of leads.
The carbon filament can be arranged in two different ways, corresponding to the
two systems Figs. 5 and 6; either by connecting each two of the three electrodes a.
bc by a loop of the usual form, as at Figs. 1 and 2, or by constructing the carbon
filament with three limbs, which are connected together at a point while the
three ends are connected to the three leads of the electrodes a be as at Figs. 3
and 4. The essential feature of the invention however consists in connecting the
three electrodes with each other through equal resistances.
It will be evident that the arrangement of the carbon filaments is capable of
being variously modified, while still carrying out the above named essential feature
of the invention.
Fig. 7 shews the mode of practically applying the above described lamps. To
the conductors A B C of the rotary phase current are connected at any desired
points three branch leads connecting the said conductors with the electrodes a be
of a lamp.
It will be seen that in using the said lamps no difference in the load of the three

page_text: conductors A B C can occur, no matter how greatly the time during which each
separate lamp is in use may vary.
Dated this 22nd day of June 1891
ABEL & IMRAY,
Agents for the Applicants.
Glow Lamps for Rotary-phase Currents.
We, SIEMENS BROTHERS & Co. LIMITED, of 12 Queen Anne's Gate, West-
minster, in the County of Middlesex, Electrical Engineers, do hereby declare the
nature of this invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:—
This invention relates to installations for the distribution of electric currents, in
which rotary-phase currents are employed. that is to say, wherein three or more
alternating currents have their phases displaced relatively to each other by equal
amourts.
Although this invention relates to all systems of such rotary-phase currents, in
the following only the case of three alternating currents whose phases are displaced
relatively to each other to the extent of an angle of 120°, will be considered.
If, for example, there are three conductors which carry the said rotary-phase
current, the current consuming devices can be arranged in two different ways
between the said three conductors; either the total number of such devices is
divided into three equal parts, and those belonging to one and the same group are
arranged parallel between two of the three conductors, as indicated at Fig. 5 of
the drawing accompanying our Provisional Specification, or the consuming devices
belonging to each group have their one pole connected with one of the said con-
ductors, and all the free poles are connected to one common point, as at Fig. 6.
Now, as it must be possible during the working to include or exclude at will any
of the current consuming devices, differences in the load of the three conductors Å
BC must unavoidably occur.
The present invention has for its object the construction of a glow lamp in such
a manner that the currents of all three of the conductors A. B and C. shall simul-
taneously act thereon. Figs. 1 to 4 of the drawing accompanying our Provisional
Specification shew constructions of lamps for this purpose.
The glass globe of the lamp is constructed in the known manner, the base thereof
however contains three electrodes a b c (or in the case of a greater number of
conductors, a corresponding greater number) and the neck of the glass globe has
the same number of leads.
The carbon filaments can be arranged in two different ways, corresponding to
the two systems Figs. 5 and 6, either by connecting each two of the three
electrodes a b c by a loop of the usual form as at Figs. 1 and 2, or by con-
structing the carbon filament with three limbs which are connected together at a
point while the three ends are connected to the three leads of the electrodes a be
as at Figs. 3 and 4.
The essential feature of the invention however consists in connecting the three
electrodes with each other through equal resistances.
It will be evident that the arrangement of the carbon filaments is capable of
being variously modified, while still carrying out the above named essential feature
of the invention:
Fig. 7 shews the mode of practically applying the above described lamps. To
the conductors A B C of the rotary-phase current are connected at any desired
points three branch leads connecting the said conductors with the electrodes a b c
of a lamp.

page_text: It will be seen that in using the said lamps no difference in the load of the three
conductors A B C can occur, no matter how greatly the time during which each
separate lamp is in use may vary.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
Constructing glow lamps for rotary phase current installations with three or
more electrodes, corresponding in number to the number of alternating currents
employed, and with a corresponding number of leads, these being all connected
together within the lamp by means of a suitable arrangement of incandescence
bodies in such manner that the uniformity of the loads of the several conductors
is insured while maintaining the independence of all the lamps, substantially as
described.
ABEL & IMRAY,
Agents for the Applicants.