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Publication numberUSRE8559 E
Publication typeGrant
Publication dateJan 28, 1879
Filing dateMay 7, 1878
Publication numberUS RE8559 E, US RE8559E, US-E-RE8559, USRE8559 E, USRE8559E
InventorsBlisha Gray
Original Assigneeby mesne Assignments
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
the harmonic telegraph c
US RE8559 E
Abstract  available in
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Description  (OCR text may contain errors)

2 Sheets-Sheet, 1. E. GRAY, Asslgpor, by means Assignments, to THE Hgnuomc TELEGRAPH 00. Apparatus for Transmitting Musical Impressions or Sounds Telegraph-wally.

j No. 8,559. Reissued Ian. 28,1879

IN E TO WI NESSES By his.d 6torneys I 2 Sheets-Sheet 2.


Assignor, by mesne Assignments, to THE HARMONIG TELEGRAPH 00. Apparatus for TransmittingMusioal Impressions or Sounds (Telegraphioally- No. s,5.59.' R'eissued Jan. 28,1879.

. WITNESSES IN V'EJVTOR I By his fltfornleys' E. g




'. Drvrsrou B.

To all whom it may concern Be it known that I, Emsna GRAY, of Chicago, in the county oi Cook and State of I1liuois', have invented certain new and useful Apparatus for Transmitting Musical Impressions or Sounds Telegraphica-lly, of which I hereby declare the following to be a full, clear, and exact description,

My invention relates to what I term an electro-harmonic telegraph, and is based upon the fact, well known to electricians, that an electromagnet clongates under the action of an electric current, and contracts again when the current ceases; consequently a succession of impulses or interruptions will. cause the magnet tovibrate, and if these vibrations be of suflicientfrequency a musical tone will be produced, the pitch of which will depend upon the rapidity of the vibrations. i

The object of my present invention is to utilize this discovery for the transmission of intelligible si nals to a distance by electricity,

- which ends, attain, first, by employing adiaphragm or disk of metal, (capable of responding to all kind of tones vibrating in unison with an electro-magnet included in an electric circuit, to reproduce audibly rhythmical impulses or vibrations representing musical impressions or sounds, or tones transmitted through said circuit; second, by employing a sound-intensifying chamber or resonator, hav-l lug-a diskor diaphragm, responsive to rhythmical impulses or vibrations representing musical impressions on sounds, whereby said rhythmical impulses or vibrations nreintensi fled andrelidered audible third, by combining an electric circuit, a sound-intensifying chamber or resonator, and a metal disk or diaphragm, acted upon through the intervention of an -electro-magnet included in the circuit ,to intensify and render audible rhythmical impulses or vibrations representing musical impressions-or sounds produced in said magnet; fourth,by em loying induced curreutsto re reduce upon-a disk or diaphragm of metal ,1 rough the intervention ot a ma et) rhyth:

mica! vibrations representing in col impress musical tones, which sions or sounds; fifth, by-employing a transmitter consisting of a coil or helix inducing rhythm ical electric impulses or vibrations in an electric circuit without interrupting its continuity, and a receiver consisting of an electromagnet having a metal disk or diaphragm for its armature sixth, by combininga telegraphic circuit, a series of circuit-breakers capable of producing musical tones of diflerent pitch, a series of keys for throwing said circuit-breakers into or out of operation, and an electromagnet receiver vibrated by the transmitters.-

In the accompan'yingdrawings, Figure 1 represents an arrangement upon circuit of apparatus which I use for carrying'out the objects of my invention, the transmitting part of the apparatus being shownin plan and the .receiver in perspective; and Fig. 2 represents a view, in elevation, of the transmitting apparatus, Fig. 3, an end view thereof, and- Fig. 4 a detail view of one of the rheotomes.

In the apparatus shown I make use of induced din-rents from either a primary or secondary coil for afiecting the vibrating bar or core of an electro-magnet, and cause the necessary succession of said currents by interruption in the primary circuit madeby an automatic or mechanical circuit-breaker.

ihe transmitting apparatus is mounted upon a suitable frame or base, A. An ordinary induction-coil, B, has the usual primary and secondary circuits to b. Automatic vibrating electrotomes O G, of the usual construction.-

have their vibrating circuitolosing springs a so adjusted that when in action they produce from the dificrence'in adjustment and the length and thickness of the springs, are of different pitch; A common telegraph-key, D, is placed in the prinary circuit, to make or break the batteryconnection, I

In the drawings 1 have shown twoelectrm tomes of identical construction; but of diflerout pitch, and two keys. .Both' the keys and electrotomes are in the primary is so divided that through each key anditi corresponding eloc-' circuit, which, part of the-circuit passes with the vibrations of the irotomc. The number of electrotomes may be increased, so that tones extending through two or more octaves may be produced.

At the receiving-station an eleetro-niagnet, E, is placed in circuit. A hollow box, drum,

cylinder, or resonator, S, of metal, is placedon the poles of the magnet. This resonator, itwill be observed, is composed of a circumferential baud having two end walls, disks, or

.that is, one capable of responding to or reproducing tones of all kinds.

The operation of the apparatus is as follows: Under the arrangement shown in the drawings, when a key is closed, the primary circuit will pass from the battery M B through the wires a, the key, and its corresponding elcctrotome,aud will be automatically interrupted in the usual manner. The spring of the electrotome will thus be caused to vibrate rapidly, and to produce stone the pitch of which is determined by the rate of vibratiori. It is obvious that several keys may be closed or depressed simultaneously. The rhythmical impulses,vibrations, or interruptions of the, current representing the tones will simultaneously produce iu thc secondary circuit, b, of the induction-coil a. series of induced currents, impulses, or vibrations 'correspoudingin. number electrotome; and, as the receiving electromagnet 'E is connected with this circuit,-it\wil1 be caused to. vibrate correspondingly, thus' producing a tone or tones of corresponding pitch with'thosc received from the transmitting apparatus. These tones are audibly reproduced and their sound intensified by the use of the hollow box, cylinder, sound-intensiiying chamber, or resonator above mentioned. The circuit may obviously be exten dcdto any distance desired from the transinitting-station.-

Wheu a single electrotome is thrown into vibration, its corresponding tone will be reproduced on the sounder or resonator S by the magnet. W hen electrotomes of different pitch are successively operated, their tones will be correspondingly reproduced by the receiver and when two or i nore electroiomesrnre simultnneously sounded the tone of eschwill still be reproduced without confusion inthe sounder or resonator S, by which means I an enabled to reproduce composite tones, melodies, or tunes.

Mechanical circuit-breakers may be substitnted for-the antomatically-vibrating elcetro' tomes hereiubei'ore described. I have, in fact,

used such mechanical circuit-breakers of vari ous construction; but I have found the electrotomo more satisfactory in practice. In this instance the receiver is shown and described as operated by the induced current of the secondary coil; but the secondary or extra our" rent of the primary coil may be used instead thereof with good efiect.

The above-described apparatus is especiallyadapted to telegraph on long land and submarine lines. Byit letters and signalscan be represented by tonesdiflering in pitch; or the ordinary Morse signals can be made by short and long interruptions in a prolonged tone of the same pitch, thus insuring great rapidity of truusmissiou.

I do notbroadly claim herein an art, method, or system oftrausmitting musical impressions or. sounds telegraphically, as that 'constitutes the subiect-matter of another division of this application filed herewith;

Letters Patent of the United States No. 166,096, granted to me July 27, 1875, (on an application originally 'flled April 18, 1874,) show an apparatus somewhat similar to the one herein described, for transmitting musical toncs'through an electric circuit composed, in part, of animahtissue anda resonant metallic receiver, but without the intervention of a- .magnet. I do not therefore claim herein anything shown in said appiication. Neither do I claim herein the combination, with a main line, of an intermittent cimuiubrcaker, 013a series thereof, each adapted to throw upon the line a. definite number of electrical impulsesper unit of time, and a key-or keys. one for,

and controlliu g each of, said, circuit-breakers,"

as such combination. constitutes the subjectmatter of another applicationfor Letters Petent of the United States 23, 1875.

The combination of a telegraph-circuit, an automatic circuit-breaker capableof producing a. musical tone, andan electro magnet receiver for reproducing the tone by being thrown intov vibrations by impulses generated by the circuit-breaker is not-broadly claimed herein, as this combination constitutes a part of the sa'hiectamatter of my said application also.

But neither of the said applications above mentioned showsa diaphragm or a sound-in tensifying chamber or resonator in combine tion with a magnet:

I claim as of my own iuventiou- V 1. The diaphragm or disk of metal, capable of responding to all kinds of tones, vibrating in unison with'tlm electro-magnet included n the electric circuit, substantially as set forth.

2. Thesonnd-intensifying chamber or resonator, having a disk or diaphragm of metal,responsive to rhythmical impulses or vibrations representing musical impressions or sounds intervention of the electro-megnet, substantially as set forth. 3. In combination,

produced in the electric circuitthrough the the electric circuit, the sonnd-intensifyin c amber or resonator, the diaphragm or dis of metal, and the electromagnct, the two latter vibrating responsivcly to rhythmical impulses orvibrations represent ing musical impressions or sounds transmitted th rough said circuit, substantially as set forth.

filed by me February r 4. In combination, the primary circuit, the

secondary circuit, the clectro-magi'iet, and the.

disk or diaphragm of metal,- respousively vibrated 'by induced currents of electricity to reproduce rhythmical impulses or vibrations representing musical impressions or sounds, substantially as set forth. I v

5. In combination, thetra-nsmitter consisting of a coil of helix, v. hereby rhythmical electrical impulses or vibrations may be induced in the telegraphic circuit without interrupting the continuity of the same, and the receiver consisting of the electro-magnet, having the metal disk or diaphragm for its armature, these being arranged to yibrate in unison with each other, and with the impulses or vibrations pro (reading from the transmittingor inducing coil, substantially as set forth.


\Vitnesses: A. G. SWARTWOUT, D. M. ERSKINE, Jr.