Improvements in Telephonic Apparatus.
Year: 1889

page_text: Date of Application, 1st Feb., 1889
Complete Specification Left, 1st Nov., 1889-Accepted, 14th Dec.. 1889
PROVISIONAL SPECIFICATION.
Improvements in Telephonic Apparatus.
"
We, ALDRED COLEMAN, of Dulas, Stanmore Road, Edgbaston in the County of
Warwick, electrical engineer, and HUBERT FEILDEN JACKSON, of Asharst, Sydenham,
Surrey, gentleman, do hereby declare the nature of this invention to be as follows:-
In translators hitherto employed for telephonic purposes in producing a current in
a metallic circuit by induction from a current in a single wire circuit, and vice versa,
it has been necessary to employ an independent indicator, visual or otherwise, in
the metallic circuit for each translator and also an independent indicator, visual or
otherwise, in each single wire circuit.
Now, this invention has for its chief object means whereby a translator employed
for the purpose aforesaid may be utilized also for the purpose of indicating visually
when a call is given from the distant exchange or from the person whose
single line circuit is at the time connected through the translator, and the independent
indicator both in the metallic circuit and in the single line circuit be thus entirely
dispensed with. The invention has also the further object of preventing or lessening
induction between translators placed near together.
The above purpose of utilizing a translator in indicating in the manner above
described is accomplished, according to this invention, by combining the movable
parts of any suitable construction of visual indicator with a translator (which may
be modified for such purpose as hereinafter described) in such manner as admits
of utilizing the core or other part of the translator forming an electro-magnet as
the magnet for operating such indicator.
The means of applying the invention for the purpose of utilizing the translator in
indicating as above described may vary considerably in detail. A convenient and
simple method consists in carrying a pole-piece or extension back from one pole of the
usual magnetised core to near the other pole thereof, and pivoting to the outer end of
the pole-piece an arinature in position to be drawn towards the last mentioned pole of
the core when a current, such as is produced in signalling by a generator or battery as
ordinarily employed for the purpose in or in connection with telephone instruments, is
passed through the translator. The armature is provided with a suitable catch arm or
other appliance which releases an indicator shutter or analogous contrivance as it
is itself operated by the armature. The part described in this modification as the
armature is in effect a jointed end of one of the poles.
According to a further method of applying the invention, a needle may be employed
to give the visual indication by its deflection.
If desired, in order to increase the magnetic power of the core, the translator may
be formed as a horse-shoe magnet, wound of course as required for the purpose of a
translator. The magnet may however be of any convenient character so that when
combined with the movable parts of any suitable construction of visual indicator such
indicator may be operated by the inagnet as above described.
A translator may be adapted both for use in indicating in the manner above described
and also for preventing or lessening induction between itself and other translators placed
hear thereto, by using an iron tube as an extension from one end of the core backwards
owards the other end, in lieu of the pole-piece above described, such tube thus
nclosing the translator coils. If it is not desired that the translator be fitted with
ndicating apparatus as and for the purpose above described, it may be used without
uch apparatus, but in either case the advantage of the induction being prevented or
essened, as above described, is secured.
Dated this 31st day of Jono 1980

page_text: COMPLETE SPECIFICATION.
Improvements in Telephonic Apparatus.
We, ALFRED COLEMAN, of Dalas, Stanmore Road, Edgbaston in the County of
Warwick, electrical engineer, and HUBERT FEILDEN JACKSON, of Ashurst, Sydenham,
Surrey, gentleman, 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:-.
In employing translators for telephonic purposes in producing a current in a
metallic circuit by induction from a current in a single wire circuit, and vice versa,
it has been usual to employ also an independent indicator, visual or otherwise, in
the metallic circuit for each translator, and also an independent indicator, visual or
otherwise, in each single wire circuit.
Now, this invention has for its chief object means whereby a translator employed
for the purpose aforesaid may be utilized also for the purpose of indicating visually
when a call is given from the distant exchange on the metallic circuit, or from the
person whose single line circuit is at the time connected through the translator, and
the independent indicator, both in the metallic circuit and in the single line
circuit, at the exchange where such translator is used, be thus entirely dispensed
with. The translator may, however, be utilised for the purpose of indicating visually
merely when a call is given, from the distant exchange, or merely from the single line
circuit, and in such case the indicator hitherto usually employed in the metallic circuit,
or in the single wire circuit, as the case may be, is dispensed with. The invention has
also the further object of preventing or lessening induction between translators placed
near together.
The above purpose of utilizing a translator in indicating in the manner above
described is accomplished, according to this invention, by combining apparatus with
the translator by which it becomes itself an indicator, or a relay to actuate an
indicator at a distance. According to the latter method of applying the invention,
less space is occupied on the indicator board, as the translators in such case may be
placed in any convenient position away from the board, whereas if the translators
are themselves used as indicators considerable space is occupied upon the indicator
board, or otherwise some complication would be involved in the connections by which
the signalling portions of the indicators would be operated at a distance from the
translators.
The means of applying the invention, for the purpose of utilizing the translator in
indicating as above described, may vary considerably in detail, and the translators may
be modified for such purpose, as hereinafter described. A convenient and simple
method in which the translator is combined direct with apparatus constituting it an
indicator is shewn in longitudinal section by figure 1.. A is the usual core magnetized
by the coils B therearound. A pole-piece or extension C is fixed to one end of the
core by the screw a, and is carried along outside the coils B to the opposite end of the
translator. Au armature bis pivoted to the outer or forward end of the pole-piece C, as
shewn also by figure 2 which is a plan of the forward end of the pole piece C shewing
the armature 6 pivoted thereto. The armature is provided with a suitable catch arm c
which gears with and retains an ordinary indicator shutter d when the same is
pushed up into the position shewn, and the armature is provided also with a
backwardly projecting arm e carrying a counter-balance weight which is screwed
thereon for the sake of adjustment. In the normal position of the parts the
counter-balance weight holds the armature out from the core and the catch arm c with
the catch in gear with the shutter d so as to retain it in its closed position; but
when a current, such as is produced in signalling by the generator or battery as
ordinarily employed for the purpose in or in connection with telephone instruments,
is passed through the translator, the armature 6 is drawn towards the core A and the
outer end of the catch arm c is depressed, and the shutter d thus released, and the
visual signal consequently given. This signal will be given, in such case, whether
с

page_text: the current is sent through the signal line circuit of a subscriber whose line is at the
time connected through the translator, or through the metallic circuit from a distant
exchange, and thus the single indicator of which the translator forins a portion
answers the double purpose of a separate indicator on the single line and on the
metallic line, respectively, and avoids the use of separate indicators in the speaking
circait, or it may be usel in place of one only of such indicators if desired. The
armature is in effect a jointel en 1 of one of the poles. The degree to which the
armature may be balanced out from the core A by the counter-balance f may be
adjusted by means of a spring stop, fixed at its hinder end to the pole piece Ú by
means of a screw h, and sprung at its outer and inwards or outwards towards or from
the pole-piece by means of an adjusting screw i. is the ordinary plate of the
indicator which is fixed direct to the indicator hoard.
In lieu of apparatus of the character shewn by which the translator is employed as
an indicator also, a needle may be employed to give the visual indication by its
deflection.
If desired, in order to increase the magnetic power of the core, the translator may
be formed as a horse-shoe magnet, wound of course as required for the purpose of a
translator. The magnet may, however, be of any convenient character so that, when
combined with any suitable apparatus constituting it also a visual indicator, the
movable portion of the indicator may be operated by the magnet as above described.
It is not of course essential that the core be utilized as the magnet for operating
the movable portion of the indicator, as any magnetised portion of the translator or
any magnetised appendage thereto may be used for such purpose.
A modification shewing the application of the invention in the case of cɔmbining
apparatus with the translator by which it may be used as a relay for operating an
indicator is illustrated by figure 3, which shews the front end of a translator
constructed in the manner described with reference to figure 1, with the parts
combined therewith by means of which the relay circuit is put into operation.
These means consist of an armature in electrical contact with the wire k of the
relay circuit and carrying an arm which, in the normal position of the parts,
bears up against a stop m and maintains the relay circuit broken, but which is
drawn down against a contact screw 12, in electrical connection with the
wire of the relay circuit, and closes such circuit, when a current, such aз is
produced in signalling by a generator or battery as ordinarily, employed for the
purpose in or in connection with telephone instruments, is passed through the
translator and the armature thereby attracted towards the core A.
Figures and 5 illustrate, in longitudinal section corresponding to figure 1,
and in plan, respectively, a translator adapted, according to this invention, hoth
for use in indicating in the manner above described and also for preventing_or
lessening induction between itself and other translators placed near thereto. For
this latter purpose, in lieu of the pole-piece C described with reference to figure 1,
ametil inbe CC, preferably of soft iron, is placed around the translator coils,
and connected to the core A at one end by means of a plate 1) which is held to
the core by a screw and to the tube by screws p. The means of operating
the movable portions of the indicator are shewn in these views as corresponding
to the means shewn by figure 1, but this translator may of course be utilized
also as a relay to operate an indicator as described with reference to figure 3.
The armature in the arrangement as shewn by figures 4 and 5 is pivoted to a
block E which is screwed to the tube CC, for convenience of construction.
A translator may be provided with a metal tube, preferably of soft iron, around
the coils, for the purpose of preventing or lessening induction, whether it is
utilized also as an indicator, or as a relay for operating an indicator in the
manner described or not, as such addition to the translator is equally an advantage
when it is used (in position near to one or more translators, or other apparatus
liable to act upon it by induction) simply in the ordinary manner,

page_text: Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
:-
1. Telephonic apparatus consisting essentially of a single wire circuit connected
through a translator and of a inetallic circuit also connected through such
translator, of means whereby such translator is utilized in giving a visual indication
when a current, such as is produced in signalling by the generator or battery as
ordinarily employed for the purpose in or in connection with telephone instruments,
is passed through either the single wire circuit from the subscriber or through
the metallic circuit from the distant exchange, and whereby therefore the
independent indicator usually employed in the single wire circuit and in the
metallic circuit, respectively, at the exchange at which such translator is used, is
dispensed with, substantially as described.
2. Telephonic apparatus consisting essentially of a single wire circuit connected
through a translator and of a metallic circuit also connected through such translator, of
apparatus in combination with such translator constituting it also a visual indicator
which takes the place of the independent. indicator usually employed in the single
wire circuit and in the metallic circuit, respectively, at the exchange at which
such translator is used, or which takes the place of such indicator in one of such
circuits, substantially as described.
3. A translator combined with apparatus constituting it also a visual indicator,
substantially as described for the purpose set forth.
4. The combination, with a translator employed for telephonic purposes, of a
metul tube or case, preferably of soft iron, surrounding the coils, substantially as
described, for the purpose set forth.
5. The combination of the pole-piece C (or tube (C), the pivoted armature b
trauslator core A, catch arm c, and indicator shutter d, all arranged and operating
substantially as described and shewn, for the purpose set forth.
6. The means, substantially as described with reference to figures 1, 2, 4 and 5 of
the drawings herewith, by which a magnetized portion of a translator is utilized in
operating the movable portions of a visual indicator, for the purpose set forth.
7. The tube CC surrounding the coils B, substantially as described and shewn,
for the purpose set forth.
Dated this 31st day of October 1889.