US280365A - Albert dtjkand - Google Patents

Description

(No Model.) 2 SheetsSheet 1.

A. DUNANID.

APPARATUS AND SYSTEM FOR T-ELBPHONIG OOMMUNIOATION.

Patented July 3, 1883.

I NVENTQRI WITNESSES:

By his .flttorneys, V

NIPETERS. P'mlo-Lhhcgmphu. Washington, D.

2 Sheets-Sheet 2.

(No Model.)

' A. DUNA-ND.

APPARATUS AND SYSTEM FOR TELEPHONIG GOMMUNIGATION.

Patented July 3, 1883.

WITNESSES:

Mmbf m/mm UNITED PATENT Omen.

ALBERT DUNAND, OF PARIS, FRANCE.

APPARATUS AND SYSTEM" FOR' T'ELEPH-O'INICF COMMUNICATION.

SPECIFICATION forming part of Letters Patent No. 280,365, dated July 3, 1883.

Application filed January 9, 1883. (No model.) Patented in France December 14, 1880, No. 140,133.

To all whom it may concern Be it known that I, ALBERT DUNAND, a citi- I heard when applied to the ear. due to the intercalation of the battery 1? in j the secondary circuit, as it is the polarization zen of the French Republic, residing in Paris, France, have invented certain Improvements in Apparatus and Systems for Telephonic Com munication, of which the following is a specification.

The possibility of reproducing sounds by the action of the undulatory current of a micro- IO phone 011 an electric condenser has long been known.

My present invention has for its object to reproduce speech by means of electric con- 'densers, and in particular singing condensers, so called. To this end I place the condensers on the secondary circuit of an induction-coil, in which circuit a battery is also in stalled, and in the primary circuit thereof is included the usual battery and microphonic 2o transmitter. Y

Figure l of the accompanying drawings is a diagram showing the electrical installation of my system. Fig.2 is an elevation of one of my singing-condensers. Fig. 3 is a transverse section of the same on a larger scale. Fig. 4 is a diagram illustrating the arrangement of the leaves in the condenser. Figs..5 and 6 show the preferred form of grouped condensers, each view being a section cut in the plane of the like-numbered line in the other. Fig.

7 is a horizontal section of a modified form of condenser. Fig. 8 is a front elevation of an other form, and Fig. 9 is a transverse section thereof.

Let B in Fig. 1 designate an induction-coil, of which 19 p is the circuit in connection with the primary wire thereof, and s s the circuit in connection with the secondary wire thereof. In the primary circuit 1) p are installed a bat- 0 tery, I, and a miorophonio transmitter-,M,

and installed it reproduces speechwith perfeet clearness, and sufficiently loud to be easily This result is of the condenser due to the potential of this battery which renders the condenser capable of reproducing articulate sounds.

The leaves of tin-foil a a of the condenser are united alternately, two by two, in such a manner as to form two series, each connected to one of the binding-posts I) b, which are mounted on the box 0, in which the leaves are inclosed. In the front of this box is an opening, e, to facilitate the escape of the sound. The leaves of tin-foil are separated from each other by the interposition-of sheets of insulating material,

of paraffiuedor varnished paper. These are shown only in Fig. 4, where they are denoted by dotted lines, the full lines denoting the leaves of foil. The best arrangement, however, is to use two of these condensers, united in derivation in the circuit 8 s, so that in listening one may be placed over each ear.

WVhen it is desired to obtain much more intense sounds, which may be heard at some distance, I combine in one box, as shownin Figs. 5 and 6, a number of condensers-say five or. six, or more, if necessary-and connect them either in series or in derivation, but preferably in derivation. The condensers are an ranged parallel, but slightly separated from each other, as shown in Fig. 5, all the armatures on one side being connected together and joined to one binding-post I), while all those on the otherside are likewise united and joined to the opposite binding-post. At one side of their inolosing-box A, at a little distance from the edges of the condensers, is an opening, E, to which one ear of the listener may be applied, while from a corresponding opening on the opposite side an acoustic tube, F, may be conducted to his other ear.

they shall touch each other at their rear edges, while their front edges are separated about a centimeter, after the manner of a fan, as shown in Fig. 7 The rear edges may be mounted on a platform or sounding-box, D. Thus constructed, it is not necessary to apply the ear Another arrange-- ment consists in placing the condensers so that loid, metal, &c.--which may be pierced with a central opening or not, as desired.

My system is not restricted in its application to the precise details and methods herein set forth and shown, but may be applied to batteries, microphones, and condensers of any kind, size, or shape.

I claim as my invention- 1. The improved system of telephonically transmitting sound, which consists of the conibination of an induction-coil, a primary circuit including the primary wire thereof, a microphonic transmitter and a battery, both included in said circuit, a secondary circuit including the secondary wire of said coil, and a battery and condenser, both included in said secondary circuit, substantially as set forth.

2. The combination, to form a receiving-telephone, of several singing-condensers grouped together, with intervening spaces to facilitate the escape of sound, and with the opposite armatures of all the condensers connected with opposite terminals, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ALBERT DUN AND.

Witnesses:

R0121. M. HOOPER, AMAND BITTER.

Images