AN IMPROVED METHOD OF GENERATING COMPOUND INDUCED CURRENTS FOR TELEPHONIC AND OTHER PURPOSES
Year: 1879

page_text: LETTERS PATENT to Robert Henelade Courtenay, of 243, New North Road,
Islington, for the Invention of "AN IMPROVED METHOD OF GENERATING
COMPOUND INDUCED CURRENTS FOR TELEPHONIC AND OTHER PURPOSES."/
Sealed the 18th April 1879, and dated the 14th February 1879.
PROVISIONAL SPECIFICATION left by the said Robert Henelade Courtenay
at the Office of the Commissioners of Patents on the 14th February 1879.
ROBERT HENELADE COURTENAY, of 243, New North Road, Islington, in the
County of Middlesex. "AN IMPROVED METHOD OF GENERATING COMPOUND
INDUCED CURRENTS FOR TELEPHONIC AND OTHER PURPOSES."
This improvement has for its object the combination by an improved method of
electro-motive force in conjunction with magneto induced currents, the permanent
magnets and coils, also electro-magnets and other appliances to be herein described
as applied and used for telephonic and other purposes.
In the cases of the receiving instrument which can be of the usual or any form,
I fix one or more permanent magnets and coils, over which I place a cylinder of
soft iron within a short distance of the permanent magnet and coil. Round this
cylinder I coil a quantity of compound wire insulated in the usual way, the wire
being coiled on the cylinder forming the electro-magnet in a similar way to a
secondary coil, that is, from the opposite end of the first coil.
A disc or plate of iron is placed over the compound magnets, or in lieu of a plate
or simple armature of iron, a resonant chamber of iron resting on and in addition
to the plate, from which plate is attached a vibrating plate when the instruments
are required for the transmission of musical sounds.
The sending instrument can be made single or compound, and of any power
required. For single sending instruments 1 use a permanent magnet and coil of
wire as above described, with cylinder of iron as above described, or in lieu thereof
some iron wire over which the coil of copper wire is wound as before described; if

page_text: the sender is a single instrument I use the south pole of the magnet which is
connected with the north pole of the receiver, that is, the coils on the receiver.
In connecting the ends of the coils the inner end of coil is connected with the
north, and the outer_to_the-south-pole, which arrangement changes the opposing
currents, causing them to flow in one direction, that is, the battery currents and
the induced currents through the action of the iron armatures on the permanent
magnets-and-coils,-the-coupling-up of this compound arrangement being exactly
-like-an-ordinary-electric-bell, and which arrangement enables a telephonic message
-to-be-sent-through-a-cable on the same wire used for ordinary telegraph.
-instruments.
The compound magnets are placed with an armature of iron which rests on a.
conductor leading from the carbon of the battery, the outside of the coil being
attached to the same, and resting on the side of the case, and which forms contact
with a suitable microphonic arrangement fixed in the top of the case; provision is
made against moisture from the breath or otherwise by the employment of water-
proofed silk, ebonite, gutta-percha, tissue, or any other suitable substance; the
remaining wire of the coil is attached to the zinc end of the battery passing outside
the case to the conductors in the top. This arrangement of coupling permanent
with electro-magnets causes the induced currents of or from the permanent magnets
to flow with greater force from the battery, and through the whole system on
account of the pole chauging taking place during the passage of the current, which
can be easily ascertained by coupling any number of the compound magnets and
coils as electro-magnets with soft iron cores, and connecting them with a
galvanometer.
To make a compound instrument with the compound magnets and coils as above
described, I take a steel magnet either as a straight bar or, bent in any convenient
form, and place on the poles of said steel magnets one or more coils of covered
copper wire, over which I place soft iron cylinders coiled with copper wire as before
described; the ends of the inside of the coils are connected with the opposite end
to which they are coiled, that is, induction at one end and actual contact at the
other, which causes the magnets not only to reverse the currents, but to convey the
currents from the battery through both poles at the same instant, each one forming
a distinct sender or receiver which can be ascertained by the galvanometer, or
making and breaking contact with an armature in front of each pole, they are
fitted into a suitable case according to the number required with an armature
adjusted to each pole, and connected by means of thin iron wire to a sheet of iron
of suitable form which is secured and rests on microphonic supports, and is
provided with a mouthpiece to which is affixed a number of stethescopic tubes
which vibrate the whole series. The connections are similar to those described
above for single instruments, and are connected with a receiver, or the sender as
above described can be used without the compound microphonic arrangement as a
receiver in lieu of a single one. The improved method of compound induction can
_be-used-for-all-purposes-to-which-electrical currents can be applied, the system
comprises the use of voltaic currents in combination and conjunction with induced
currents, and the method of coupling up enables the induced currents or a com-
bination of both to be used for telephones through ordinary circuits in general use
for telegraphic purposes.