Apparatus for Transmitting Motion to a Distance by Means of Electrical Energy.
Year: 1897

page_text: Date of Application, 29th Mar., 1897
Complete Specification Left, 24th Dec., 1897-Accepted, 19th Feb., 1898
Apparatus for Transmitting Motion to a Distance by Means of
Electrical Energy.
We, SIEMENS BROTHERS & CO. LIMITED, of 12, Queen Anne's Gate, Westminster,
in the County of London, Electrical Engineers, do hereby declare the nature of
this invention (which has been communicated to us from abroad by Siemens and
Halske, 94, Markgrafenstrasse, Berlin, in the German Empire, Electrical Engineers),
to be as follows:-
This invention relates to apparatus for transmitting motion from one point to
another situated at a greater or less distance therefrom in such manner that perfect
synchronism of the movements at the two points shall be obtained, whether the
amount of energy transmitted by such motion be great or sınall.
We will describe the said invention with reference to the accompanying drawings.
In Figure 1, A, B, represents a fixed coil or pair of coils, A, B, a moveable pair of
coils. If the coils A, B, are supplied with alternating currents, there will be induced
in A, B, an electromotive force which will depend upon the angle which the two
pairs of coils form with each other. If both pairs of coils are supplied with alternating
currents of the same frequency, there will be produced a turning moment in
consequence of which the two pairs of coils will reciprocally attract or repel each
other. This turning moment depends upon the strength of current in the two pairs
of coils, the difference of phase of the two currents, and the angle which the coils
form with each other.
We will assume two such apparatus to be connected, as shewn for instance at
Figure 2, in such manner, that while the fixed pairs of coils A, B, and A, B, are
arranged in series with the current flowing in the same direction through them, the
coils A, B, and A, B, are arranged so that the currents flow through A, B, in the
opposite direction to those in A, B₂.
Assuming for the sake of simplicity that the coils are all identical in size and
number of windings, then, if the fixed pairs A, B, A, B, be supplied with alternating
current, there will be produced in the pairs A₂ B₂ and A, B electromotive
forces and e, which will be equal to each other if both pairs have the same
relative position, but which will be of different value if the respective fixed and
moveable coils form different angles with each other. There will consequently occur
between these coils an equalising current which, having regard to the difference of
phase, will be proportional to the difference e₁ - e₁.
=
In consequence of this equalising current there will be produced a turning moment,
in consequence of which the moveable coils will endeavour to shift so that they
assume identical positions relatively to their fixed coils, that is to say, so that 42.
When this has been effected, the current in the connecting leads and consequently
the turning moment will disappear and the coils will remain at rest. The above
described arrangement will consequently have the effect that the moveable coils will
always be brought to the same positions relatively to the fixed ones, so that if the one
pair of coils, such as A, B, be moved through a small angle, the pair A B must

page_text: follow in the same direction through the same angle. Consequently any movements
of the coils, say, A, B, of the one apparatus will be transmitted to the coils A, B, of
the other apparatus, and the forces produced in both apparatus will be identical.
It will be readily understood that the synchronous motion of the two sets of coils
thus produced may be utilised for a variety of purposes; thus if an index attached
to the coils A, B, be moved into a certain position, then an index attached to the
coils A, B, will be brought to eactly the same position.
Instead of connecting the A, B, and A, B, in series, they can also be connected in
parallel without in any way affecting the above described action. Also, the positions
of the fixed and moveable coils can be reversed.
If, in the one pair of coils, such as A, B, two leads be interchanged, the phase in
this pair will be shifted 180°, and the coils will consequently be shifted to the same
extent. It is not necessary that the primary apparatus (A₁ B₁ A, B₂) and secondary
apparatus (A, B, A B₁) should be exactly equal; it is only necessary to so proportion
the windings that with the same relative positions of the fixed and moveable coils,
the same electro-motive forces are produced.
Instead of constructing the coils as ring-windings, as described, they may be con-
structed as drum windings, as at Figure 3; also, in place of producing a rotary
motion a rectilinear motion may be produced. Figure 4 shews an arrangement for
this purpose; A, B, and A, B₁ are two fixed pairs of coils and A₂ B₂, A В₁ are two
moveable pairs, the latter being of such a size that they can pass into the fixed coils.
If the fixed coils A₁ B₁, A, B, bе supplied with alternating currents, then electro-
motive forces will be produced in the pairs of coils A, B, and A B₁.
If the fixed coils, as also the moveable ones, are identical or similar, the electro-
motive forces induced in the moveable coils will be equal if these have the same
relative positions to the fixed coils, in which case no current will occur in the con-
necting leads A₂ A, B₂ B₁. If they have different relative positions an equalising
current will occur in these leads in consequence of the difference in the electromotive
forces.
In consequence of the action of the currents in the fixed and moveable parts there
will occur attracting and repelling forces by means of which the same relative
positions of the coils will be re-established. Any movement of the coils A, B, of the
one apparatus will therefore result in a corresponding movement of the coil A B of
the other apparatus.
With the arrangements above described there occur positions of the moveable coils
relatively to the fixed ones in which a change of position produces no alteration of
the electromotive forces, so that no mechanical action will take place. The arrange-
ment can therefore be perfected by providing, in place of a single moveable coil or
pair of coils, several coils or pairs of coils crossing each other. The coils may in this
case be arranged in any desired manner, so long as the coils of the primary and
secondary apparatus are arranged similar.
It will however be most advantageous to arrange the coils in symmetrical positions,
as by this means the turning moment will be approximately constant in all positions
of the moveable part.
2
Figure 5 shews such an arrangement with two pairs of moveable coils A, B, and
A, B, crossing each other at right angles in the primary apparatus, and A, B, and
A, B, in the secondary apparatus. The corresponding pairs A, B, and A, B, A, B,
and A, B are respectively connected together. The fixed pairs of coils A, B, and
A. B. are connected in parallel and are fed from the same source of alternating
current. The same effect would also be produced if the pairs of coils A, B, and A. B
were connected in series instead of in parallel. Also in this case the position of the
fixed and moveable coils can be reversed.
The action can be still further improved if the fixed part be also provided with
several crossing coils or pairs of coils, which are best supplied with polyphase
currents. By this means a greater stability of the arrangement and greater coupling
power will be obtained. Figure 6 shews such an arrangement for two-phase currents.
The two apparatus contain two pairs of coils A, B, and A, B, crossing each other at

page_text: right angles in the primary, and A, B, and A, B, in the secondary apparatus, the
corresponding coils being connected in parallel.
They are supplied with current from a polyphase current generator through
leads 1, 2, 3.
Two leads may be combined in one in the known manner so that there are only 3
supply and 3 connecting leads required, as shewn at Figure 6, lead 3 being connected
to B, and B, and to B, and B.
In the pairs of coils A B and A В of the primary apparatus and in A, B, and
A, B, of the secondary apparatus there will also be produced two-phase currents.
In the movable part there are also two connecting leads, namely A, A, and A. Ag
which are united in one. There are therefore six leads for coupling the two apparatus.
A lead of the fixed part and one of the movable part can be combined, so that finally
there would be only 5 leads required.
The secondary apparatus will move accurately synchronously with the primary
apparatus, the motion being quite independent of the direction of rotation of the
rotary field produced by the poly-phase current. Whether the primary apparatus be
turned in the direction of the rotary field or in the contrary direction, the secondary
apparatus will always move in the same direction through a corresponding angle,
both apparatus acting as though they were connected by gearing.
The coils A, B, and A, B, can be interchanged, in which case the moveable part
will turn 90° in advance, while all other conditions remain the same.
For the proper
connection of the coils it is only necessary to so arrange them that the rotary field
produced by the two-phase current in the secondary apparatus shall have the same
direction of motion as the rotary field produced by the difference of the electromotive
forces in the induced windings.
It is therefore also not necessary that the primary and secondary apparatus shall
both revolve in the same direction; if for instance in the secondary apparatus the
sequence of the screw terminals for the fixed and moveable parts be reversed, thereby
also reversing the direction of the rotary field in the fixed and moveable parts, the
direction of motion of the secondary apparatus will also be reversed.
It is therefore possible to alter the direction of motion of the secondary apparatus
by a suitable commutation of the leads in the fixed and moveable parts, whether in
the primary or in the secondary apparatus. Thus for instance by introducing
suitable commutating devices the movement of the primary apparatus in one
direction only may be made to produce motion in both directions in the secondary
apparatus.
The windings of the primary and the secondary apparatus need not be equal; it
is however necessary that they should be so relatively proportioned that, in addition
to the above-named requirements, the electromotive forces induced in both apparatus
shall be equal as regards amplitude and phase when the relative positions of the fixed
and moveable parts of both machines are identical.
a
It is furthermore not necessary that the apparatus should be bi-polar as shewn
on the drawing; they can have any desired number of poles, and these may be
different in number in the two machines. If the primary apparatus has n₁ poles
and the secondary apparatus n, poles, then a rotation of the first through an angle
will effect the turning of the second through the angle
The two apparatus
consequently behave as though they were connected by gearing the number of teeth
of which are proportioned as n₁ : N₁₁
ԴՆջ
a.
The two apparatus can also be of different size. If in the induced parts of the
apparatus one lead, such as B, B, in Figure 6, be interrupted, they will still operate,
the one inducing part having in that case two-phase currents while the induced part
has simple alternating currents.
Instead of two phase currents any poly-phase currents can be employed; Figure 7
shews by way of example an arrangement in which the two apparatus consist of two
asynchronous three-phase current motors.
The coupling current is supplied by the generator P. Three leads carrying

page_text: currents with phase shift of 120° lead to the two motors, the primary motor M, and
the secondary one M.
The inducing coils of the two motors are shewn connected in parallel by way of
example; the ends of the induced coils lead to three sliding contact rings from which
the connecting leads start, as shewn.
The inducing coils, as also the induced ones, can be connected by star or mesh
couplings.
The inducing part may be arranged for three-phase currents and the induced part
for two-phase currents without altering the action.
In all the above described arrangements it was assumed for the sake of simplicity
that there was only one primary and one secondary apparatus; there may however
be any number of secondary apparatus all operated simultaneously by one primary
apparatus.
If the distance between the primary and the secondary apparatus is considerable,
transformers may be introduced into the connecting leads, so as to increase the pressure
of the currents from the primary apparatus and to reduce it again before the currents
pass into the secondary apparatus. If the windings of the latter are arranged for
high pressure, the reducing transformers can be dispensed with.
Instead of arranging both apparatus to operate with rotary motion, as at
Figures 2, 5, and 6, or both with rectilinear motion as at Figure 4, the one apparatus,
such as the primary one, may operate with rotary motion and the secondary one
with rectilinear motion, the connections of the circuits of the fixed and moving parts
respectively being suitably arranged for that purpose. Also, one and the same
apparatus may have coils both for rotary motion and for rectilinear motion. If the
coils of two such apparatus are suitably connected, both kinds of motion can be
transmitted simultaneously.
Two or more apparatus can be combined for transmitting any desired descrip-
tions of movements to parts externally of the apparatus. Thus two primary motors
may, for example, have fixed on their armature shafts slotted arms arranged to cross
each other, a pin serving as index being passed through both slots at the point where
they cross.
Such
Two secondary motors are arranged in precisely the same manner with crossing
slotted arms and index. Both sets of motors being included in the circuit of a
current generator, if motion be imparted to the arms of the primary motors, causing
the indicator pin to move through a certain path, then the arms and indicator pin of
the secondary motor will be made to move in precisely the same manner.
motions of the pins may either serve themselves as signals or they may serve to
actuate signals, or, if the slots of the arms be suitably shaped, a design of a certain
configuration described by the pin of the primary motors may be reproduced at a
distance by the pin of the secondary motors.
It will be obvious that the above-described invention can be applied to a great
variety of purposes other than those above referred to by way of example. Such
apparatus need not necessarily be provided with a special supply circuit and source of
current, they can also be connected to the circuits of existing electrical installations.
They may also be worked by continuous current, provided a suitable commutator
be provided for converting this into intermittent currents of different phase.
Dated this 29th day of March 1897.
ABEL & IMRAY,
Agents for the Applicants.

page_text: Apparatus for Transmitting Motion to a Distance by Means of
Electrical Energy.
We, SIEMENS BROTHERS AND COMPANY LIMITED, of 12, Queen Anne's Gate,
Westminster, in the County of London, Electrical Engineers, do hereby declare the
nature of this invention (which has been communicated to us from abroad by
Siemens & Halske, Markgrafenstrasse No. 94, Berlin, Germany, Electrical Engineers),
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 apparatus for transmitting motion from one point to
another situated at a greater or less distance therefrom in such manner that perfect
synchronism of the movements at the two points shall be obtained, whether the
amount of energy transmitted by such motion be great or small.
We will describe the said invention with reference to the drawings accompanying
our Provisional Specification and those accompanying this Specification.
In Figure 1, A, B, represents a fixed coil or pair of coils, A, B, a moveable pair of
coils. If the coils A, B, are supplied with alternating currents, there will be
induced in A, B, an electromotive force which will depend upon the angle
which the two pairs of coils form with each other. If both pairs of coils are supplied
with alternating currents of the same frequency, there will be produced a turning
moment in consequence of which the two pairs of coils will reciprocally attract
or repel each other. This turning moment depends upon the strength of current
in the two pairs of coils, the difference of phase of the two currents, and the angle
which the coils form with each other.
We will assume two such apparatus to be connected, as shewn for instance at
Figure 2, in such manner, that while the fixed pairs of coils A, B, and A, B, are
arranged in series with the current flowing in the same direction through them, the
coils A, B, and A. В are arranged so that the currents flow through A, B, in the
opposite direction to those in A, B¸.
Assuming for the sake of simplicity that the coils are all identical in size and
number of windings, then if the fixed pairs A, B₁ A, B, be supplied with alternating
current, there will be produced in the pairs A, B, and A. B. electro-motive
forces €1 and which will be equal to each other if both pairs have the same relative
position, but which will be of different value if the respective fixed and moveable
coils form different angles say 12 with each other. There will consequently occur
between these coils an equalising current, which having regard to the difference of
phase, will be proportional to the difference₁
eq.
In consequence of this equalising current there will be produced a turning
moment, in consequence of which the moveable coils will endeavour to shift so that
they assume identical positions relatively to their fixed coils, that is to say, so that
Vi
When this has been effected the current in the connecting leads aud consequently
the turning. moment will disappear and the coils will remain at rest. The above
described arrangement will consequently have the effect that the moveable
coils will always be brought to the same positions relatively to each other,
so that if the one pair of coils, such as A₂ B₂, be moved through a small
angle, the pair A B must follow in the same direction through the same angle.
Consequently any movements of the coils, say, A, B, of the one apparatus will be
transmitted to the coils A, B, of the other apparatus, and the forces produced in both
apparatus will be identical.
It will be readily understood that the synchronous motion of the two sets of coils
thus produced may be utilised for a variety of purposes; thus, if an index attached
.

page_text: to the coils A, B, be moved into a certain position, then an index attached to the
coils A, B, will be brought to exactly the same position.
Instead of connecting the coils A, B, and A, B, in series, they can also be
connected in parallel without in any way affecting the above described action. Also
the positions of the fixed and moveable coils can be reversed.
If, in the one pair of coils, such as A, B, two leads be interchanged, the phase in
this pair will be shifted 180°, and the coils will consequently be shifted to the same
extent. The conditions otherwise remain the same. It is not necessary that the
primary apparatus (A, B, A, B,) and secondary apparatus (A, B, A, B₁) should be
exactly equal; it is only necessary to so proportion the windings that with the same
relative positions of the fixed and moveable coils, the same electromotive forces are
produced.
Instead of constructing the coils as ring-windings, as described, they may be
constructed as drum windings, as at Figure 3; also, in place of producing a rotary
motion a rectilinear motion may be produced. Figure 4 shews an arrangement for
this purpose; A, B, and A, B, are two fixed pairs of coils and A, B, A, B are two
moveable pairs, the latter being of such a size that they can pass into the fixed coils.
If the fixed coils A, B₁, A, B, be supplied with alternating currents, then electromotive
forces will be produced in the pairs of coils A, B, and A. B
If the fixed coils, as also the moveable ones, are identical or similar, the
electromotive forces induced in the moveable coils will be equal if these have the
same relative positions to the fixed coils, in which case no current will occur in
the connecting leads. If they have different relative positions, an equalising current
will occur in these leads in consequence of the difference in the electromotive forces.
In consequence of the action of the currents in the fixed and moveable parts there
will occur attracting and repelling forces by means of which the same relative
positions of the coils will be re-established. Any movement of the coils A, B₁ of the
one apparatus will therefore result in a corresponding synchronous movement of the
coil A, B, of the other apparatus.
With the arrangements above described there occur positions of the moveable coils
relatively to the fixed ones in which a change of position produces no alteration of
the electromotive forces, so that no mechanical action will take place. The
arrangement can therefore be perfected by providing, in place of a single moveable
coil, or pair of coils, several coils or pairs of coils crossing each other. The coils may
in this case be arranged in any desired manner, so long as the coils of the primary
and secondary apparatus are arranged similar.
The moveable coil groups may be arranged in the known manner of the armature
of a rotary phase current machine.
It will be advantageous to arrange the coils in symmetrical positions, as by this
means the turning moment will be approximately constant in all positions of
the moveable part.
Figure 5 shews such an arrangement with two pairs of moveable coils A B₂
and A, B, crossing each other at right angles in the primary apparatus, and A, B,
and A, B in the secondary apparatus. The corresponding pairs A₂ B₂ and
A, B, A, B, and A. B. are respectively connected together. The fixed pairs of
coils A, B, and A, B, are connected in parallel and are fed from the same source
of alternating current. The same effect would also be produced if the pairs or
coils A, B, and A, A, were connected in series instead of in parallel. Also in this
case the position of the fixed and moveable coils can be reversed.
The action can be still further improved if the fixed part be also provided with
several crossing coils or pairs of coils, which are best supplied with polyphase currents.
By this means a greater stability of the arrangement and greater coupling power will
be obtained. Figure 6 shews such an arrangement for two-phase currents. The two
apparatus contain two pairs of coils A, B, and A, B, crossing each other at right
angles in the primary, and A, B, and A, B, in the secondary apparatus, the
corresponding coils being connected in parallel.

page_text: They are supplied with current from a polyphrase current generator through
leads 1, 2, 3.
Two leads may be combined in one in the known manner so that there are only
three supply and three connecting leads required, as shewn at Figure 6, lead 3 being
connected to B, and B, and to B, and B.
In the pairs of coils A, B, and A. B. of the primary apparatus and in A, B, and
A, B, of the secondary apparatus there will also be produced two-phase currents. In
the moveable part there are also two connecting leads, namely A, A, and A, A, which
are united in one. There are therefore six leads for coupling the two apparatus. A
lead of the fixed part and one of the moveable part can be combined, so that finally
there would be only five leads required.
The secondary apparatus will move accurately synchronously with the primary
apparatus, the motion being quite independent of the direction of rotation of the
rotary field produced by the polyphase current. Whether the primary apparatus be
turned in the direction of the rotary field or in the contrary direction, the secondary
apparatus will always move in the same direction through a corresponding angle, both
apparatus acting as though they were connected by gearing.
The coils A, B, and A, B, can be interchanged, in which case the moveable part
will turn 90° in advance, while all other conditions remain the same. For the proper
connection of the coils it is only necessary to so arrange them that the rotary field
produced by the two-phase current in the secondary apparatus shall have the same
direction of motion as the rotary field produced by the difference of the electromotive
force in the induced windings.
It is therefore also not necessary that the primary and secondary apparatus shall
both revolve in the same direction; if for instance in the secondary apparatus the
sequence of the screw terminals for the fixed and moveable parts be reversed, thereby
also reversing the direction of the rotary field in the fixed and moveable parts, the
direction of motion of the secondary apparatus will also be reversed.
It is therefore possible to alter the direction of motion of the secondary apparatus
by a suitable commutation of the leads in the fixed and moveable parts, whether in
the primary or in the secondary apparatus. Thus for instance by introducing suitable
commutating devices the movement of the primary apparatus in one direction only
may be made to produce motion in both directions in the secondary apparatus.
The windings of the primary and secondary apparatus need not be equal, it is
however necessary that they should be so relatively proportioned that, in addition
to the above named requirements, the electromotive forces induced in both
apparatus shall be equal as regards amplitude and phase when the relative
positions of the fixed and moveable parts of both machines are identical.
It is furthermore not necessary that the apparatus should be bi-polar as shewn on
the drawings; they can have any desired number of poles, and these may be different
in number in the two machines. If the primary apparatus has n₁ poles and the
secondary apparatus n, poles, then a rotation of the first through an angle a will
effect the turning of the second through the angle 111
a. The two apparatus conse-
quently behave as though they were connected by gearing the number of teeth of which
are proportioned as n₁: n₂.
No
The two apparatus can also be of different size. If in the induced parts of the
apparatus one lead, such as B, B, in Figure 6, be interrupted, they will still operate,
the one inducing part having in that case two-phase currents while the induced part
has simple alternating currents.
Instead of two phase currents any polyphase currents can be employed, Figure 7
shews by way of example, an arrangement in which the two apparatus consist of two
asynchronous three phase current motors.
The coupling current is supplied by the generator P. Three leads carrying
currents with phase shift of 120° lead to the two motors, the primary motor M₁
and the secondary one M.

page_text: The inducing coils of the two motors are shewn connected in parallel by way of
example; the ends of the induced coils lead to three sliding contact rings from which
the connecting leads start as shewn.
The inducing coils, as also the induced ones, can be connected by star or mesh
couplings; thus the one winding can be connected in a star coupling and the other
winding in a mesh coupling. Of course corresponding commencements and ends
of the coils of the induced parts of the primary and secondary apparatus may have
a separate or a common return lead.
The inducing part may be arranged for three-phase currents and the induced part
for two-phase currents without altering the action.
The arrangements described with reference to the two-phase current are the same
for three-phase currents. If the motor M, is rotated with a certain peripheral
velocity, the motor M₂ will revolve with accurately synchronous speed. The motors
are therefore in the described arrangement the most accurate synchronous motors
for rotary phase and alternating current working.
In all the above described arrangements it was assumed for the sake of simplicity
that there was only one primary and one secondary apparatus ; there may however
be any number of secondary apparatus all operated simultaneously by one primary
apparatus.
Figure 8 of the accompanying drawings shews such a distributing installation. P
is the primary machine producing the necessary coupling current. The inducing
windings of the primary apparatus M and of the secondary apparatus m, m2 m3 MA
are connected in parallel, as are also the induced windings. Every movement that is
effected in the apparatus M will be transmitted in a perfectly synchronous manner
to all the secondary apparatus.
If the primary apparatus rotates continuously, all the other apparatus will follow
in exactly the same manner.
If no continuous rotation is required and it is sufficient to move the apparatus
with a step-by-step motion, say every five minutes, through a certain angle, it is
only necessary to connect the secondary apparatus to the primary machine during
the continuance of such motion. If induction coils be introduced into the fixed
circuit of a secondary apparatus, the motion of this apparatus will be somewhat
retarded or accelerated.
The secondary apparatus then either moves in advance at a certain angle or lags
behind at the same angle. The primary machine P may supply energy for any
other purposes, such as for electric lighting, besides the work of transmitting the
said motion, as indicated at Figure 8 by the three glow lamps G connected by the
mesh coupling.
If the distance between the primary and secondary apparatus is great, transformers
can be included in the circuits, as shewn at Figure 9. By the use of the trans-
formers T T the pressure of the primary apparatus M or of the machine P will be
increased, and at the secondary apparatus m the pressure will be re-transformed.
If the secondary apparatus are wound for high pressures, the secondary transformers
can be dispensed with. Figure 10 shews an arrangement for transmitting rectilinear
motion instead of rotary motion, by means of a three-phase current.
The three inducing windings A₁ B₁ C₁ of the primary apparatus are connected in
parallel with the windings A, B, C₂ of the secondary apparatus, and are fed by a
common rotary phase current machine. The induced windings a₁ b₁ c₁ and a b₂ c₂ slide
within the fixed inducing windings. For the sake of clearness they are shewn
outside the fixed coils at Figure 10.
If the coils a b₁₁ have a relative position to the coils A, B, C₁ different from
that of a b₂ c₂ relative to A₂ B₂ C₂, there will be produced in the connecting leads
of the coils a α by b₂, α c₂, equalising currents; the resulting attracting or
repelling forces will bring about the same relative positions of the coils again. The
secondary apparatus consequently moves synchronously with the primary apparatus.
The action can be increased by means of an iron core arranged within the coils
and an outer concentric iron sheath.

page_text: In place of arranging the fixed and moveable coils concentric to each other, their
axes may also be arranged parallel to each other.
In Figure 11 two apparatus are combined of which the one A is arranged for
rotary motion, and the other B for longitudinal motion. The arrangement of the
connections will be understood from the drawings. By the combination of these
apparatus it is rendered possible to convert a rotary motion into a rectilinear motion,
and the converse.
An apparatus may also be provided with windings for rotary motion and for
rectilinear motion. If the windings of two such apparatus are suitably connected,
both kinds of motion will be simultaneously transmitted.
Two or more apparatus can also be connected for transmitting any kind of
motion either in a plane or in space. In Figure 12 is shewn by way of example the
combination of two apparatus for rotary motion. P is the machine supplying the
requisite current for coupling. Two motors M, and M, serve as primary apparatus,
the axis of each of which carries a lever-H, H, respectively,-with longitudinal slot,
as shewn. Two similar motors m, and m, serve as secondary apparatus, having the
same devices.
In the crossing point of the two levers H, and H₂ is a pin A passing through both
slots. The levers h₁ and h₂ will always assume positions corresponding to those
of H, H₂.
A pin a passing through the slots of h₁ h₂ will consequently always follow
accurately the movements of the pin A.
In this way the configuration of designs can be readily transmitted through any
distances.
In the foregoing some of the numerous applications of the invention have been
described by way of example. A great variety of other applications may of course be
made where it is a question of transmitting synchronous motion, the energy to be
transmitted being either great or small. For transmitting a small amount of energy
only very small current generators would be required. Continuous current may in
this case also be used, if by means of a suitable commutator intermittent currents of
varying phase are produced. The said apparatus can also have their induced.
windings connected to an existing alternating current or rotary phase current
installation. This invention is not to be mistaken for the known arrangements for
transmitting synchronous motion in which alternating currents or rotary phase
currents are produced in the moveable parts, while the fixed parts are excited by
continuous currents, such as the synchronous transmission of energy by means of a
rotary phase current machine, both of which are excited by a continuous current.
this case a certain extent of motion of the one part does not result in the same
extent or a proportional extent of motion of the other part, as in the present
invention, and in the position of rest the two moveable parts are not rigidly coupled
with each other.
In
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. Apparatus for transmitting motion to a distance by means of electrical energy,
wherein such energy is made to operate upon two similar devices provided with
moveable parts, (such as pointers) that are mechanically connected to moveable electro
dynamic coils or systems of coils which assume for certain positions of the moveable
parts corresponding positions relatively to fixed coils which are supplied with
alternating currents, the said moveable coils of both devices being connected with
each other by leads to form a circuit, so that in all positions of the moveable coils
that do not correspond with each other an equalising current is produced in the said
circuit, the electro dynamic effect of which will be to tend to bring the moveable
coils into the corresponding positions, substantially as described.
2. In apparatus such as is referred to in the first claim, replacing the moveable coils
by groups of moveable coils which are mechanically connected with each other, and

page_text: which assume different relative positions to the said fixed coils, for the purpose of
preventing the formation of dead centres in the transmission of motion to a
distance.
Dated this 4th day of Doomban 100-
ABEL & IMRAY,
Agents for the Applicant.