US232675A - Telephone - Google Patents

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US232675A US232675DA US232675A US 232675 A US232675 A US 232675A US 232675D A US232675D A US 232675DA US 232675 A US232675 A US 232675A
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    • H04R11/00Transducers of moving-armature or moving-core type


(Moden 0.11. BUELL. A. Telephones. No. 232,675. Patented Sept. 28, i880.
SPECIFICATION forming part of Letters Patent No. 232,675, dated September 28, 1880,
Application filed July 2, 1880. (Model.)
To all whom it may concern Be it known 4that I, CHARLES E. BUELL, of New Haven, in the county of New Haven and State of Connecticut,haveinvented a new Improvementin Telephones; and I do hereby declare the following, when taken in connection with the accompanying drawings andthe letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent7 in- Figure l, a plan view of theinterior of the telephone and transmitter in connection; Fig. 2, a sectional view of the telephone.
This invention relates to telephones which are adapted to the reproduction of sonorous waves or vibrations by means of electrical impulses traversing a conducting-circuit.
The object of my invention is to increase the sensitiveness of receiving-telephones; and a further object of my invention is to construct and arrange receiving-telephones in such a manner as to afford their double use as the induction apparatus of a battery-transmitter; and my invention consists in the construction hereinafter described, and particularly recited in the claims.
Although the accompanying drawings represent my improvements as grouped in one instrument, it is obvious that parts may be used in telephones which differ in the detail of their construction from the one shown.
A is the diaphragm in contact with the end of the core of each of the. electro-magnets l 2 3 4, the contact being at or near the edge of the diaphragm.
The actuating-magnet ofthe telephone is in the form of an induction-coil, and is an electromagnet. The soft-iron core ais contained within a helix, b, of low resistance, which, when charged as the primary coil of the inductorium, acts to magnetize the core a. The electro-magnet thus formed is surrounded by a helix, C,
of ne insulated wire of suit-able resistance, and this inclosing-helix serves as the inducing-helix of a` receiving-telephone and as the secondary helix of an induction-coil 'of a variable transmitter.
The primarylhelix b forms part of a local circuit, in which is included the transmitter T of any of the ordinary carbon or other transmitters depending for their operation upon variable resistance. The electro-magnets l 2 3 4 are also included in the same local circuit, and connected in relation to the primary coil b, so as to cause the cores of the several electro-magnets at the edge of the diaphragm A to be of an opposite magnetic polarity from that of the core a of the inducing-magnet C.
The secondary coil c forms part of the main circuit. These parts are arranged in a case which is provided witha mouth-piece, lB, and a handle, lz, through which the iiexible conductors for main and local circuits may pass to connect with their respective helices.
The contact of the light iron diaphragm with the mass ot" iron of the cores 1 2 3 4: contributes to its inductive mass without adding to its weight or impeding its vibrations, and when these cores are charged in an opposite polarity to the core of the inducing-magnet the dia` phragm is rendered responsive to the slightest inductive eli'eot exerted through the varying magnetic condition of the core a of the inductorium C.
The employmentot'electro-magnets, as placed at the outer edge of a telephone-armature wholly separated from the central inducingmagnet and included in the same normallyf closed electric circuit with the primary helices of the inducing-magnet, and producing oppo- -site magnetic polarity, as shown, results in the following-named advantages: Shortened magnetic cores can be used, which will respond more rapidly to variations of magnetic induction, and by being charged by an opposite polarity in the saine normally-closed circuit with the inducing-magnet they serve to hasten the dissipation of the retained magnetism, which is present in the inducing-magnet when its closed circuits tension is varied, a dissipation of retained magnetism, which otherwise is prolonged in its cessation and an obstacle to distinctness of articulation, and.
the employment of an induction apparatus as the actuating-magnet of a receiving-telephone dispenses with the inducing-coil in the combination heretofore used with variable transmitters employing local batteries, and with advantageous results.
l claiml. The combination, with the armature of a 1o magnet of a telephone, of one or more electromagnets included in the same normally-Closed' electric eireuit therewith, and arranged to produce secondary pulsations in an opposite direction thereto, when the tension of the ineluding eireuit is varied, and With means for Varying the eircuits tension, as shown.
CHARLES E. BUELL. Witnesses:
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