Improvements in Telephonic Apparatus.
Year: 1892

page_text: Date of Application, 11th Oct., 1892
Complete Specification Left, 11th July, 1893-Accepted, 11th Nov., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by ELOY NORIEGA, of Mexico, in the Republic of
Mexico.]
Improvements in Telephonic Apparatus.
I, HENRY HARRIS LAKE of the Firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings, London W.C. in the County of Middlesex, do hereby
declare the nature of this invention to be as follows:-
The object of my invention is to construct a compact and efficient telephone for
transmitting and receiving speech.
My invention consists in a combined transmitter and receiver formed of an
angular handle-piece carrying at one end a microphone and at the other end a
magnetic receiver, and in the combination therewith of an auxiliary transinitter
and receiver, by means of which conversation can be carried on by two persons
through ene instrument.
The handle, which may be of vulcanite or other suitable material, contains a
narrow U-shaped magnet provided with lateral pole-pieces, to the said pole pieces
is attached a screw-threaded ring, to which is fitted a metallic internally-screw-
threaded ring. To this ring is hinged the diaphragm cell, the said cell being
provided at a point diametrically opposite the hinge with an adjusting lever for
varying the distance between the pole-picces and the iron diaphragm, clamped to
the diaphragm cell by an ear piece of the usual description.
Upon the pole pieces are placed bobbins which are in the main telephone circuit.
A curved arm, of brass or other non-magnetic material, is inserted in the handle
and is held in place by a screw, passing through a slot in the said arm and into the
curved end of the magnet, also by a block, attached to the side of the arm and
adapted to slide throuhg the arms of the magnet. The curved arm carries at its
free end a diaphragm cell, containing a diaphragm the said diaphragm being
preferably made of pine or other resonant wood protected by a coating of shellac
or other water resisting material.
To the diaphragm are secured carbon bars, which are bored to receive the ends
of the carbon rods. The said carbon rods are pressed toward the diaphragm by a
cushion, of absorbent material, such as felt or cotton. The bars are connected up
with the local battery and the primary wire of the introduction-coil.
In a modified form of telephone the extremities of the U-magnet are bent
laterally and perforated to receive the screws. The bobbins are mounted upon
right-angled pole-pieces, which are slotted to receive the screw, entering the angled
ends of the magnet. The part of the angled pole-piece upon which the wire is
wound is formed of series of soft iron pins projecting from the slotted portion of the
pole-piece. In other respects the telephone is similar to the receiver above described.
In another modification the bobbins are mounted upon polar extensions, which
are secured to the end of the U-magnet by screws inserted in the slotted ends of
the set-screws. In a further modification the angled plates, which support the
bobbins are attached to the sides of the U-magnets, and the cores of the bobbins,
which form a part of the angled plates, are formed of iron rods, as in the other
To the magnet is secured an externally threaded collar, to which is fitted
the diaphragm cell, which is capable of being adjusted by turning the cell upon the
collar, thereby causing the diaphragm contained by the cell to approach or recede
from the poles of the magnet.
case.

page_text: COMPLETE SPECIFICATION.
Improvements in Telephonic Apparatus.
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 performed, to be
particularly described and ascertained, in and by the following statement :-
My invention consists in a combined transmitter and receiver formed of an
angular-shaped handle-piece carrying at one end a microphone and at the other end
a inagnetic receiver, and in the combination therewith of an auxiliary transmitter
and receiver, by means of which conversation can be carried on by two persons
through one instrument.
The object of my invention is to construct a compact and efficient telephone for
transmitting and receiving speech.
In the accompanying drawings,
Figure 1 is a longitudinal section of my improved combined transmitter and
receiver.
Figure 2 is a sectional view of the telephone magnet.
Figure 3 is an elevation partly in section of a modified form of telephone.
Figure 4 is an end view of the same with the ear piece removed.
Figure 5 is a further modified form of telephone.
Figure 6 is a detail thereof and
Figures 7, 8 and 9 show a still further modification.
Similar letters of reference indicate corresponding parts in the several views.
Referring to Figures 1 and 2 the handle A, which may be of vulcanite or other
suitable insulating material, contains a narrow U-shaped magnet B, provided with
lateral-pole-pieces C, to the said pole pieces is attached a screw threaded ring D, to
which is fitted the metallic internally-screw-threaded ring E. To this ring is
hinged the diaphragm cell F, the said cell being provided at a point diametrically
opposite the hinge with an adjusting lever G for varying the distance between the
pole-pieces C and the iron diaphragm H, clamped to the diaphragm cell F by the
chamfered ear picce I of the usual description.
Upon the upper ends of the U-shaped magnet B are secured, by means of
screws, the pole pieces C to which are attached the bobbins J, which are in the
main telephone circuit. The bobbins J consist of a core made of a series of soft
iron pins or rods or of pieces of wire suitably secured to the pole pieces C so as to
form oblong cores upon which the wire forming the bobbins is wound. The pins or
rods forming the core are preferably made of different diameters as shown in
Figure 2 the largest being in the middle and the smaller ones decreasing in
diameter towards the outside. A curved arm K, of brass or other non-magnetic
material, is inserted in the handle A and is held in place by a screw m, passing
through a slot in the said arm and into the curved end of the magnet B, also by a
block n, attached to the side of the arm K and adapted to slide through the arms
of the magnet. The curved arm K carries at its free end a diaphragm cell L,
containing the diaphragm M, the said diaphragm being preferably made of pine or
other resonant wood protected by a coating of shellac or other water resisting
material.
To the diaphragm M are secured carbon bars N N¹, which are bored to receive
the ends of the carbon rods O. The said carbon rods are pressed toward the
diaphragm by a cushion P, of absorbent material, such as felt or cotton. The
bars N N are connected up with the local battery and the primary wire of the
induction-coil.
In the modified form of telephone shown in Figures 3 and 4 the extremities of
the U-shaped magnet are bent laterally and perforated to receive the screws i.
The bobbins J are mounted upon right-angled pole-pieces, which are slotted to

page_text: receive the screws i screwed into the angular ends of the magnet h¹. The part of
the pole-piece upon which the wire is wound is formed of series of soft iron pins l',
projecting from the slotted portion of the pole-piece substantially in the manner
shown in Figure 2.
In the form shown in Figures 5 and 6 the bobbins J" are mounted upon polar
extensions k², which are secured to the end of the U-shaped magnet 12 by screws
inserted in the slotted ends of the said magnet as shown in Figure 6. In the
modification shown in Figures 7, 8 and 9 the angular plates or pole pieces ³ which
support the bobbins J³ are attached to the sides of the U-shaped magnets h³ and the
cores of the bobbins, which form a part of the angled plates are formed of iron
rods, as in the other case. To the magnet 3 is secured an externally threaded
collar to which is fitted the diaphragm cell 1, which is capable of being adjusted
by turning the cell upon the collar, thereby causing the diaphragm g' contained by
the cell to approach or recede from the poles of the magnet.
Having now particularly described and ascertained the nature of this said inven-
tion, 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. In a telephone-receiver, a pole-piece formed of series of round rods or wires
of different diameters attached to the pole of a permanent magnet and forming an
oblong core adapted to receive the bobbins, substantially as specified.
2. In a combined telephone transmitter and receiver the combination of the
tubular insulating-handle A, the U-shaped magnet B, having the lateral pole-
pieces C, the bobbins J, placed on the pole pieces, the diaphragm-cell F, the
diaphragm H, and adjustable curved arm K, the diaphragm-cell L, the diaphragm M,
the perforated carbon bars N N', the carbon rods O, and the cushion P, sub-
stantially as specified.
3. In a combined telephone transmitter and receiver the combination of the
tubular insulating-handle A, the U-shaped magnet B, having the lateral pole pieces C,
the screw threaded ring D, the screw threaded collar E, fitted to the ring D, the
diaphragm cell F, hinged to the collar E, the diaphragm H and curved arm K, the
bobbins J placed on the pole pieces C, the diaphragm cell L, the diaphragm M,
the perforated carbon bars N N', the carbon rods O, and the cushion P, sub-
stantially as specified.
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1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.