IMPROVEMENTS IN APPARATUS OR MEANS FOR CONTROLLING THE PASSAGE OF ELECTRIC CURRENTS IN TELEPHONIC OR OTHER ELECTRIC " CIRCUITS
Year: 1885

page_text: I JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of said Invention for "IMPROVEMENTS IN
APPARATUS OR MEANS FOR CONTROLLING THE PASSAGE OF ELECTRIC CURRENTS IN
TELEPHONIC OR OTHER ELECTRIC
"
CIRCUITS which Invention has been com-
municated to me from abroad by La Société P. Barbier & Cie of Paris in the
Republic of France to be as follows:-
This Invention has for its object providing means for controlling the passage of
electric currents in telephonic or other circuits and it consists in the employment of
a secondary or primary battery interposed in the circuit in opposition to the line
battery The electromotive power of the battery so interposed is so calculated as
to counterbalance the current from the main battery and prevent this current from
passing along the line but does not prevent the passage of currents of higher
tension such as the telephonic or signalling currents.
The current intercepter is hereinafter described as being applied to a telephone
circuit but it is evident that it may be employed in conjunction with any other
electrical apparatus wherein it is desirable to obtain similar results.
When a series of telephones for example are arranged in derivation upon the
circuit of a battery one or more of these telephones may be left in the battery
circuit the current from the battery being at the same time prevented from passing
through such telephone or telephones by the action of a small battery interposed in
the circuit in the vicinity of the telephone-The coils in the telephone being thus
always in the circuit can receive signals or communications sent from the central
office by means of currents of high tension whilst on the other hand the ordinary
currents of the battery circuit being stopped the arrangement does not involve any
exhaustion of the main battery.
The intercepting batteries may be readily constructed by taking an ordinary
lead accumulator which may be of very small size and consist for example of a box

page_text: with partitions containing acidulated water in contact with lead wires bent to the
form of an inverted U and arranging it in such a manner that it tends to become
charged by the action of the main battery A magnetic call or signalling device
and a polarised bell apparatus may be employed in combination with the improved
arrangement and enables a call to be sent independently from one station to
another The telephone at each station may be hooked or suspended for example
from an automatic commutator which when the telephone is placed on the hook
connects the call or signalling apparatus and when the telephone is unhooked
establishes a contact connecting the telephone with the line-According to another
arrangement an induction coil is substituted for the aforesaid magnetic call-In
this case the telephone itself acts as the receiver of the call and the hook
commutator may be dispensed with.

page_text: Improvements in
Apparatus or Means for Controlling the
Passage of Electric Currents in Telephonic or other Electric
Circuits.
I, JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of
Middlesex Gentleman do hereby declare the nature of this Invention which has
been communicated to me from abroad by La Société P. Barbier & C¹º of Paris
in the Republic of France and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This Invention has for its object providing means for controlling the passage of
electric currents in telephonic or other circuits and it consists in the employment
of a secondary or primary battery interposed in the circuit in opposition to the
line battery as hereinafter described. The electro motive power of the battery so
interposed is so calculated as to counter balance the normal current from the main
battery and prevent this current from passing along the line but does not prevent
the passage of currents of higher tension such as the telephonic or signalling
currents.
This current intercepter or interrupter is hereinafter described as being applied
to a telephone circuit but it is evident that it may be employed in conjunction
with any other electrical apparatus wherein it is desirable to obtain similar
results.
And in order that the said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the corresponding figures.
When a series of telephones T is arranged in derivation upon the circuit of n
battery as indicated in the diagram figure 1 of the accompanying drawings one or
more of these telephones may be left in the battery circuit the current from the
battery being at the same time intercepted or prevented from passing through
such telephone or telephones by the action of a small battery interposed in tho
circuit in the vicinity of the telephone T as indicated at K The coils in the
telephone T being thus always in the circuit can receive signals or communications
sent from the central office by means of currents of high tension whilst on the
other hand the ordinary currents of the main battery circuit being stopped by the
action of the battery at K the arrangement does not involve any exhaustion of
the main battery at P.
In figure 2 of the accompanying drawings T represents a local or subscriber's
telephone B the push button or contact maker of the call bell P the main or line
battery and S the bell of the central station A small battery whose electro motive
power is approximately equivalent to the electromotive power of the line battery
is arranged at K in the vicinity of the telephone T This small local battery is
arranged in opposition to the line battery P so that no appreciable current can pass
from the latter along the line L L' through the local telephonic apparatus at T.

page_text: The electric current may be intercepted by employing any suitable electric
battery or a small secondary battery which tends to become charged by the action
of the battery P. Figure 3 represents in vertical and horizontal section an
example of a small secondary battery arranged for obtaining this result This
intercepting battery may be readily constructed by taking an ordinary lead
accumulator which may be of very small size and consist for example of a box K¹
with partitions forming cells containing acidulated water in contact with lead
wires i bent to the form of an inverted U and arranging it in such a manner that
it tends to become charged by the action of the main battery. Figure 4 illustrates
an arrangement in which a magnetic call or signalling device M and a polarised
bell apparatus S¹ are employed in combination with the improved arrangement
hereinbefore described with reference to figure 2 This arrangement has the
advantage of enabling a call to be sent independently from one station to another
which is not possible in the arrangement represented in figure 2. The telephone
at each station inay be hooked or suspended from an automatic commutator y
which when the telephone is placed on the book closes the circuit of the call
or signalling apparatus at t and when the telephone is unhooked establishes
a contact at u thereby connecting the telephone with the line-According to
another arrangement illustrated in figure 5 an induction coil n is substituted for
the magnetic call M employed in the arrangement illustrated in figure 4. In this
case the telephone itself acts as the receiver of the call and the hook commutator y
may be dispensed with.
These current interrupters or intercepters prevent the passage of the battery
current which is counterbalanced by that of the interrupter but the telephonic
currents, the currents of the magnetic call or of the induction coil are enabled
owing to their high tension to pass the current interrupter or intercepter with
facility and convey communications or calls either from the station B or from the
central office.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed, I declare for what
I claim is
First. In combination with a telephonic or other like electric circuit a current
interrupter or intercepter such as a secondary battery so arranged as to render
the telephones bells or other local apparatus practically inaccessible to the currents
of low tension from the main battery but not to interfere with the passage of the
telephonic signalling or other currents whose tension is greater than that of the
intercepter all substantially as hereinbefore described and illustrated in the
accompanying drawings.
Second. In combination with a telephonic or other like electric circuit a primary
battery placed in opposition to the main line battery or generator for the purpose
of intercepting the low tension currents from the latter substantially as heroinbefore
described and illustrated in the accompanying drawings.
Dated this 20th day of Al 1000