US308754A - Fbedeeick w - Google Patents

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US308754A
US308754A US308754DA US308754A US 308754 A US308754 A US 308754A US 308754D A US308754D A US 308754DA US 308754 A US308754 A US 308754A
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reed
vibrations
vibrating
signals
harmonic
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/02Channels characterised by the type of signal
    • H04L5/06Channels characterised by the type of signal the signals being represented by different frequencies
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00Electromagnetic relays
    • H01H51/30Electromagnetic relays specially adapted for actuation by ac
    • H01H51/32Frequency relays; Mechanically-tuned relays

Description

(No Model.)
P. W. (BUSHING.
REED FOR HARMONIG TELEGRAPHS. No. 308,754. Patented Dec. 2, 1884.
llmll mulnmm @51 ma wow I N. PETERS Fholo-Lllhngnpher. Washington 0.0.
FREDERICK XV. OUSHING, OF NEW YORK, N. Y.
REED FOR HARMONIC TELEGRAPHS.
SPECIFICATION forming part of LettersPatent No. 308,75k, dated December 2, 1884.
(No model.)
To ctZZ whom it may concern:
Be it known that I, FREDERICK W. GUsH- ING, a citizen of the United States, residing in the city, county, and State of New York, have invented certain new and useful Improvements in Adjusting Devices for Electro- Harmonic Telegraph-Receivers, of which the following is a specification.
My invention relates to the class of telegraphic apparatus by means of which aseries of electrical vibrations corresponding to different musical tones or notes are transmitted over the conducting-line, and a series of vibrating reeds respectively organized to re spond to the different classes of vibrations or undulations thus transmitted are actuated thereby. Such instruments are usually denominatedharrnonic telegraphs. The vibrating reeds in these tone-relays or analyzers are arranged in such a manner with reference to corresponding local circuits that the vibrations of the same and the cessation of such vibrations caused by the operation of the transmitter are made to record the telegraphic communications in Morse or other similar characters or signalsby means of an instrument included in the local circuit.
It is found in practice that the successful operation of the tone-relays is seriously impaired by extraneous influencessuch, for instance, as atmospheric electricity, induction from neighboring conducting-wires, &c. These influences manifest themselves in interruptions of or increases in the magnitude of the vibrations, whereby the false signals are produced by the receiving-instruments in the lo cal circuits. I have found that these effects may be counteracted and the false signals almost entirely avoided by the employment of a yielding cushion held against the vibrating reed in a suitable position with reference to its vibrating end, and provided with adjustments whereby its pressure against the reed may be conveniently modified as required by changes in the strengths of the currents eniployed and the other causes affecting the amplitude of the vibrations.
In the accompanying drawings Ihave illustrated an analyzer or tone-relay with an ad- 5 justing device arranged to carry out my invention, Figure 1 being a plan, and Fig. 2 aside elevation, of the instrument.
In the drawings, A is the base of the instrument; B, the electro-magnet, and b its armature. A vibrating reed, D, is fastened seourely to the standard E at one end, and carries the armature b, fastened at its other extremity, which is the free or vibrating end. An adjustable weight, d, is carried upon the reed D, and this weight may be moved lengthwise for the purpose of adjusting the latter to the proper pitch. A curved arm, G, turning upon the bearings g and carrying an adjustable weight, g, rests upon the reed D. Aspring, .8, adjustable by means of the thumb-screw s, turning in the standard H, is applied to the arm G for the purpose of adjusting the pressure against the reed. At the end 9 of the arm G there is placed a platinum contactpoint, which rests upon a similar contactpoint on the end of the reed D. Suitable binding-posts, S S, are designed to receive the main-line conductor, and these posts are connected with each other through the coils of the electromaguet B. Two binding-posts, S S, are employed for connecting the local circuit through the arm G and reed D. For this purpose a conductor leads from one of the posts S to the standard H, and thus to the balanced arm G, and a second conductor leads from the other binding-post, S, to the standard E, which sustains the reed D. When the reed D is vibrated by reason of the transmission over the main line of a series of impulses corresponding to its fundamental note or tone, the lever G, which is so adjusted that its vibrations must be much less than those of the reed D, ,is not able to follow the vibrations of the latter, and thus preserve a continuous contact, as would be the case if its rate of vibration were as great or greater than that of the reed D; but it is made to jar or rattle at the point of contact, and for all practical purposes it keeps the local circuit open so long as the reed D continues to vibrate. The instant, however, that the vibration ceases the c011- tact-points upon the two levers come to rest, the local circuit is established, and the magnet inthe local circuit is operated. Hence it will be readily understood that the continuance and interruptions of the vibrations over the main wire which operate the reed D may be used to operate the magnet in the local circuit, and to thereby record Morse or other signals. It will be seen that a delicate adjustment of the lever G is necessary to thus obtain the record of the break and continuance in the vibrations of the reed D; and it thus results that the local circuit, of which it forms a part, will be readily affected by slight extraneous causes. An increase in the current upon the main wire, such as might be caused by atmospheric electricity, may either stop the vibrations of the reed entirely or suddenly increase the amplitude of its vibrations, so as to prevent the proper recording upon the local magnet of the signals actually transmitted. So, also, the presence of other conductors in the immediate neighborhood over which the make-and-break signals are being sent may and does affect the regular operation of the reed and the correct recording of the signals which it is designed to give. Again, when the main-line conductor over which the harmonic waves are sent is used at the same time as a common conductor for transmitting the signals of other systems, such as ordinary Morse, then, when the independent battery for this second system is thrown upon the line a jar is produced upon the reed, caused by the sudden increase in the attractive power of the magnet, and false signals in the localcircuit are frequently the result. To overcome these dilficulties I have invented a device shown in the drawings, and which will now be described. Immediately underneath the vibrating reed D,and at a point not far from the end at which it is fastened-to the standard E, I place a rod, I, which turns in bearings within the uprights J and J, on opposite sides of the reed D. By means of a thumb-screw, K, and setting-screw L, the rod I can be turned and held in any desired position. To this rod Ithere is attached a piece of rubber, M, or other similar yielding material, at right angles to it, and at a point immediately under the reed D, so that it can be pressed against the under side of the reed with any desired force by means of the screw -K. This yielding material or cushion, while it does not materially impair the vibration of the reed, serves to prevent the reed from re sponding to false currents.
I claim as my invention 1. The combination, substantially as hereinbefore set forth, in a harmonic-telegraph receiving-instrument, with thevibrating reed, of ayielding elastic cushion pressing against the reed, substantially as described.
2. The combination, substantially as here inbefore set forth, in a harmonic-telegraph receiving-instrument,with the vibrating reed, of a yielding elastic cushion pressing against the reed,substantiall y as deseribed,and means, substantially such as described, for adjusting the pressure of said cushion.
8. The combination, substantially as hereinbefore set forth, with the vibrating reed of a harmonic-telegraph receiving-instrumcnt, of a contact-arm resting upon one side of the same, an elastic cushion pressing against said reed upon the opposite side, and means, sub stantially such as described, for adjusting the pressure of said cushion.
i. The combination, substantially as hereinbefore set forth, with the vibrating reed of a harmonictelegraph instrument, of the clastic cushion M and screws K and L, and the rod I, organized substantially as described.
In testimony whereof I have hereunto subscribed my name this 28th day of June, A. D. 1884.
FREDERICK \V. CUSHING.
Witnesses:
DANL. W. EDGECOMB, CHARLES A. TERRY.
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