Improvements in Electrical Resistance Devices.
Year: 1898

page_text: [Communicated from abroad by STRALSUNDER BOGEN LAMPENFABRIK, GESELLSCHAFT
MIT BESCHRÄNKTER HAFTUNG, of Stralsund, in the Empire of Germany.]
Improvements in Electrical Resistance Devices.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare
the nature of this invention to be as follows:-
This invention relates to a resistance for electrical conductors, by means of which
numerous advantages are obtained owing to the fact that the wire is wound
drum fashion in any desired number of layers concentric one with the other, the
separate layers of the coils being kept apart by means of intermediately arranged
rods.
In carrying the invention into practice the aforesaid rods are arranged around
a central portion, such rods being of a suitable insulating material, when the
insulation of the wires is not otherwise provided for. The resistance wire is wound
spirally around these rods; the superposed coils may be of any desired number. In
order to facilitate the winding of the wires, and to maintain a fixed interval between
them, the rods may be provided with grooves. When the first coil has been formed
in the manner described, the second coil may be formed by means of the inter-
position of a second series of rods, these latter being arranged similarly to the
first mentioned rods. Such additional coils as are required may be formed in the
same manner by using intermediate series of rods. The whole of the coils may be
readily formed from one. continuous wire.
The first series of rods may be of any suitable cross-section and they may be
arranged or grouped in any desired manner. An advantageous manner of group-
ing the rods is the star form of grouping in which the rods are held in position
between plates; these latter are provided with grooves or recesses for the purpose
of facilitating the assemblage of the parts, the several series of rods fitting in such
recesses. The ribs or projections serve as bearings for the innermost series of rods.
All the parts are preferably united into one whole by means of the central bolt
which connects the two star-shaped plates.
According to the special circumstances of each particular case, the device may
be made either higher or flatter, or of greater or of less diameter, either by
employing a greater or less number of coils in the vertical direction or by increasing
or diminishing the number of coil series or groups which are co-axial one with the
other. The innermost group of rods may be dispensed with if desired; the core or
central bolt being in such cases so arranged that the wire may be wound directly
upon it.
The improved resistance possesses this important advantage as compared with the
resistances hitherto employed, that a large number of coils of wire may be
arranged within a very small compass. At the same time both the coiling of the
wire and the assembling of the various parts may be very readily effected. The
drum form of winding is extremely advantageous for many purposes, for example,

page_text: for the arrangement of the resistance for arc lamps. It is also important that
the resistance should be of light weight and of a form suitable for packing.
This
is attained by means of the present invention and the last named point is
especially advantageous for forwarding purposes. In addition to this, a very
effectual penetration of the device by air is obtained, as the air is able to reach the
wires upon all sides and to pass between them, so that any considerable degree of
heating need not be apprehended. As the rods are of the same form for all the
coils, it follows that but few new parts need be employed for the production of
different sizes of the apparatus having varying numbers of coils.
As already stated, the grouping and fixing of the rods may be of any desired
form. Instead of imparting to the resistance the form of a cylindrical or prismatic
drum, it may be made oval or of any other suitable form in plan. It is, however,
essential in each case, that the resistance should be formed of groups of coils
arranged concentrically and separated by means of intermediate rods.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in Electrical Resistance Devices.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare
the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:--
This invention relates to a resistance for electrical conductors, by means of which
numerous advantages are obtained owing to the fact that the wire is wound
drum fashion in any desired number of layers concentric one with the other, the
separate layers of the coils being kept apart by means of intermediately arranged
rods.
The invention is illustrated in the accompanying drawing, in which:
Figure 1 represents a resistance in accordance with the invention in cross-
section.
Figure 2 is a plan view of the same.
Figure 3 is a section on line A-B Figure 1, and
Figures 4 and 5 illustrate one of the two star-shaped plates which serve to
maintain the intermediate rods in position in plan and section respectively.
In carrying the invention into practice the aforesaid rods a as shewn in Figures 1
and 2 are arranged around the central portion t, such rods being of a
suitable insulating material, when the insulation of the wires is not otherwise
provided for. The resistance wire is wound spirally around these rods a; the
superposed coils may be of any desired number. In order to facilitate the winding
of the wires, and to maintain a fixed interval between them, the rods a may be
When the first coil has
provided with grooves a¹, as shewn in Figures 1 and 3.
been formed in the manner described, the second coil may be formed by means of
the interposition of a second series of rods a¹, these latter being arranged similarly
to the first mentioned rods a. Such additional coils as are required may be formed
in the same manner by using additional series of rods a² a³ and so on."
by means of dotted lines at din Figure 2, the whole of the coils may be readily
formed from one continuous wire.
As shewn

page_text: The first series of rods a may be of any suitable cross-section and may be arranged
or grouped in any desired manner. An advantageous manner of grouping the rods
is the star form of grouping illustrated in Figure 2, in which the rods are held in
position between the plates 6; these latter are provided with grooves or recesses b
for the purpose of facilitating the assemblage of the parts, the several series of
rods a, a', a fitting in such recesses. The ribs or projections 69 serve as
bearings for the innermost series of rods a. All the parts are preferably united
into one whole by means of the central bolt & which connects the two star-shaped
plates b.
According to the special circumstances of each particular case, the device may be
made either higher or flatter, or of greater or less diameter, either by employing a
greater or less number of coils in the vertical direction or by increasing or
diminishing the number of coil series or groups which are co-axial one with the
other. The innermost group of rods a may be dispensed with if desired; the core
or central bolt t being in such cases so arranged that the wire may be wound
directly upon it.
The improved resistance possesses this important advantage as compared with the
resistances hitherto employed, that a large number of coils of wire may be
arranged within a very small compass. At the same time both the coiling of the
wire and the assembling of the various parts may be very readily effected. The
drum form of winding is extremely advantageous for many purposes for example,
for the arrangement of the resistance for arc lamps. It is also important that the
resistance should be of light weight and of a form suitable for packing. This is
attained by means of the present invention and the last named point is especially
advantageous for forwarding purposes. In addition to this, a very effectual
penetration, of the device by air is obtained, as the air is able to reach the wires
upon all sides and to pass between them, so that any considerable degree of heating
need not be apprehended. As the rods a a¹ a² are of the same form for all the
coils, it follows that but few new parts need be employed for the production of
different sizes of the apparatus having varying numbers of coils.
As already stated, the grouping and fixing of the rods a a¹ a³ may be of any
desired form. Instead of imparting to the resistance the form of a cylindrical
or prismatic drum, it may be made oval or of any other suitable form in plan. It
is, however, essential in each case, that the resistance should be formed of groups
of coils arranged concentrically and separated by means of intermediate rods."
.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is:
1. An electrical resistance device having co-axial or concentrically arranged
layers of wire coils, characterized by two plates bb connected together and provided
with radial guideways grooves or recesses bb for the reception and the retaining
of insulating bars or rods a, a, a³, so arranged as to enable one coil to be finished
and then another coil to be wound upon the next group of bars placed in position
around the first finished coil.
2. An electrical resistance device having co-axial or concentrically arranged
layers of wire coils constructed and arranged substantially as hereinbefore described
with reference to the drawings.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.