US954062A - Telautograph. - Google Patents

Description

G. S. TIFFANY.

TELAUTOGRAPH.

APPLIOATION FILED MAY16,1907.

954,062. Patented Apr. 5, 1910,

3 SEEETSSHBET lv w mr 9 a a Maw- W G. S TIFFANY. TELAUTQGRAPH. APPLICATION FILED MAY 16,1907

Patented Apr. 5, 1910 3 SHEETS-SHEET 2.

G. S, TIFFANY. TELAUTOGRAPH.

APPLICATION FILED MAY 16, 1907.

954,062. Patented Apr. 5, 1910.

" a sums-sum BEST AVAILABLE COPY UNITED-STATES, PATENT oEEIoE.

GEORGE STEELE TIFFANY,OP*SUKMIT, NEW JERSEY, ASSIGNOR TO THE GRAY HA- TIONAL TELAUTOGRAPH COMBZANY, OF NEW YORK, N. Y., A CORPORATION" OF VIRGINIA.

'rELAUnoGnAPH.

PatentemApr. 5, 1910.

.Original appIication filed Rgbruary 5, 1906, Serial il'o. 299,413. Divided and this application filed May 16,

'1907. Serial No. 374,037. e

0 all il ltom it may concern:

Be it known that I, GEORGE S. TIFFANY, a citizen of the United States, residing at Summit, county of Union, and State of New Jersey, have invented certain new and useful Improvements in Telanlxigraphs, fully described and represented in the following specification and the. accompanying drawings, formin a part of' the same.

The invention of this application division of my application filed February 5, 1906, Serial No. 299,413) relates to improvements in relays for electric circuits.

'Although devised with especial reference to telautographic systems, the improvements of the present invention are capable of application to other systems emploving a main line circuit and another circuit the condition of which is controlled thereby through a .relay, as will be apparent from the detailed description of the present invention, which will now be given in conneclion with a telautographic system.

In the accompanying draWings-Figures l and 2 illustrate, mainly in diagram, two

stations of a telautographic system, each equipped with a. relay embodying the present invention. Figs. 3, 4 and 5 are details, upon an enlarged scale, of the master switch with which each station is provided. Fig.

(3 is a vertical section, on an enlarged scale,

of the relay illustrated in Figs. 1 and 2.

Fig. 7 is a bottom view of said relay; and

Fig. 8 is a cross sectioinon the line B of Fig. 6, of a circuit closing device forming part of the relay.

The telautogra 'ihic apparatus illustrated in the drawings is of the type in which the movements of the receiving pen of the distant station in unison with the transmitting tracer of the station from which mes-- sages are being transmitted to said distantstation, are effected by variations in the strength of the currents sent to line from the transmitting instrument to the receiving instrument, such variations in current strength being in turn effected. by and corresponding to the movements of the trans mitting tracer. The particular apparatus illustrated in said drawings is identical with that illustrated and described in detail in my prior application aforesaid, except that here sonie'of the devices and circuit connections which appear in the drawings of my said prior application have been omitted for clearness and because illustration thereof in the present case is unnecessary. E'xcept'for the relay constituting the present invention and the circuits and devices controlled thereby, the telautographic ap aratus shown herein need only be describe briefly, reference being made to ,my said rior application for a more detailed description of it.

Each station of the telautographic apparatus shown comprises a transmitting instru- -ment (designated 1 inFig. land 1 in Fig. 2), a receiving instrument (desi nated 2. in Fig. 1 and 2? in Fig. 2), an oscillatory master switch (designated 3 in Fig. 1 and 3 in Fig. 2,) for connecting the transmitter or receiver of its station with the receiver or transmitter, respectively, of another station, or connecting together-the receiver and transmitter of its own station for testing, and a battery (designated at in Fig. 1 and 4 in Fig. 2) from which, when the station is transmitting, currents, varying in strength in ac cordancewith the movements of the trans? initting tracer, are shunted into the main line.

I strumeut of Fig. l and the receiving instrument of Fig. 2 will be selected for such de scription. The same reference numerals will be applied to corresponding parts in Fi s. l and 2, except that, for convenience of de script-ion, reference letter a will be added to the reference numerals'in Fig. 2. i

The transmitting instrument (Fig. 1) is provided withthe usual depressible writing platen 5 on which the writing instrument or tracer G rests in transmitting, the usual paper strip (not shown) on which the tracer makes its record being fed over this table by paper shifting mechanism such as shown and described in my prior application aforesaid. The tracer (3 is pivotally mounted in the con verging ends of a pair of hinged arms 7, 8, the opposite ends of which are pivoted to the outer ends of a pair of arms 9,. l0 pivotally (from which they are suitably insulated) 5 hav ng at their outer ends spring plates in rlili are journaled roller contacts 1%, 15, actively, which, as the arms or bell crank rs 9, 12 and 10, 13 are oscillated by the lm-i felllel'lll oi the transmitting tracer (3, 1s :v" e back and forth between the-opposite s of a pair of rheostats 16, 1?, respecrely. These rheostats are in circuit at their :positxe ends with battery 4 so that when the rcuits connecting them with said battery e closed, currents are shunted through the eostats 16, 17 and arms 12, 13 into the main line circuits leading from the transmitting instrument to the distant receiver; these currents varying in strength in accordance with the positions assumed by the roller contacts 14, 15 between the ends of said rheostats. One end of rheostat 16 is at all times connected by wires 18, 19 with the negative pole of battery 1, and the corresponding end of rheostat- 17 is also connected therewith by wires 20, 19; this pole of thebattery being grounded, as shown, so that the currents supplied by said battery to the main 1 ne circuits, or, when it is serving as the local battery of the receiver, are positive. Normally the master switch 3 occupies the position in which it is shown in 3, and in this position of the master switch the transmitter of the station is off and the receiver of that station is on, or ready to receive messages, and in this position of the switch the opposite or smaller ends of the rheostats 16, 17 are not connected with the positive pole of battery 4;. When, however, the master switch is rocked forward from the position shown in Fig. 3 to the osition shown in Fig. 4-, these ends of the r eostats 16, 17 are connected with the positive pole of battery 1-,rheostat 16 by wires 22, 23, contacts 2 1 25, contact plate 26 (carried by switch 3 and which in this position of said switch electrically connects said contacts 24, and wire 27 to the positive pole of battery 1, and the rheostat 17 by wires 28, 23, contact 24, plate 26, contact 25 and wire 27 to the positive pole of battery 4. In this position of the master switch also two contact plates 29, 30 carried by and suitably insulated from master switch 3 close the main line circuits from the transmitting instrument to the re} ceivin'g instrument of the distant station,

plate 29 by engaging and electrically connecting a pair of upper and lower contacts 31, 32 in the right hand main line circuit, and plate 30 by en aging and electrically connecting a pair 0 upper and lower conit ts 33 3 1 in the left hand main line ciri. with the switch 3 in this position, the ht hand main line circuit from the transting station (Fig. 1) consists of arm 12,

wire 35, right secondary winding 36 of an induction coil, (the function of which Will be hereinafter pointed out) wire 37, contact 31, plate 29, contact 32, and wire 38 leading to the right hand side of the receiving instrument (Fig. 2) while the left hand main line circuit consists of arm 13, wire 39, left secondary winding 10 of the induction coil just referred to, wire 11, contact 33, plate 30, contact 3 1, and wire 42 leading to the left hand side of the receiving instrinnent (Fig. 2).

At the time the master switch 3 of Fig. 1 is thus shifted to transmitting position, the master switch 3 of the distant station being in its normal position,-that is, with the transmitter of that station off and the receiver thereon on,the contact plate 26 of switch 3 will be out of engagement with contacts 24, 25 so that the circuits from battery 4* through rheostats 16", 17 of that station (Fig. 2) are open. In this position of the masterswitch 3*, also, its plates 29, 30 are lowered out of engagement with upper contactsill", 33 respectively, and into engagement with the two contacts 43 11*, respectively, (see Fig. l), contact 13 being electrically connected by plate 29 with under contact 32, and contact 44 by plate 30* with under contact 31.

\Vith the master switch 3 in this position, the right hand main line circuit of Fig. l entering and passing through the receiving instrument 2 of Fig. '2, consists of line wire 38" (continuation of wire 38 of Fig. 1), contact 32-, plate 29 of master switch 3, contact 13, wire =15, vertically movable coil 16 on the right hand side of the receiving instrument, and wires 17, 48 leading thence to ground at 19 (Fig. 2) and back to the negative pole of battery 4; (Fig. 1); while the left hand ain line circuit consists of wire 4C2 (con ainuation of wire 42 of Fig. 1), contact- 3 1, plate 30* of mastelr switch 3, contact 141, wire 50 leading therefrom through. the winding of a combination relay 51 (embodying the present invention), wire 52 leading therefrom to a vertically movable coil 53 at the left hand side of the re ceiver, and wires 54: and 48 leading thence to ground at 49 (Fig. 2) and back to the negativepole of battery 1- (Fig. 1). The coils 46, 53*, just referred to, fit loosely over the vertical cores 55 of the field. magnet 56, and normally are at the upper ends of said cores, in which position they are held by chains 57 and springs 58.

In the'normal position, just described, of the master switch 3, with the transmitter off and the receiver on, battery 4: of Fig. 2 serves as a local battery for the receiving instrument, one of the functionsperformed by it being the energization of mag net 56, the circuit throughwhich it does this worlr consisting of wire 27 from the' application, locks master switch 3" in its normal position while current 15 on the lett hand main line circuit), wire (31: to ma net 56 ,-W11'6-62 leading from said magnet to a contact plate 63 carried by but insulated.

from "armature 04: of relay 51, contact- 65 described, will then be" as follows: The crater of thetransnntter transmitter thereof] on mastersw tch 3* of Fig.

- is thus movedlaterally from unison pcfor plate 63, and wire (36 leading therefrom to the negative pole of .iattery q and ground. lVhen the master switch 13 in the normal position just described and current is passing over the left hand main line rircuit from battery at of the t ansmittiug instrument (Fig. l), the 51, through which this circuit passes, wi l he energized,

relay and attractit-s armature M which will cause plate 63 to engage contact and thus close the circuit just described through magnet 56 from battery 4, and this local circuit willrenia'xn closed so long as there is any current on the left hand main line circuit. 1 "With the master switch 25 of ig. iii} the position shown in. Fig. -l-, that is' sothat the receiver. of that sttz. 'on is oil ,nd the and with in t e position v t e reshown in Fig, 3;that is, lnitter of tl'iat"stati(),il--.iso ceiver thereof 011", the in: cults from. the transinitfter lt the. ceiver 01 Fig. 2 will. be closed with current passing over them from battery The operation of the am atus, briefly Fig.1) will the transmitting tracer from its restin' place in unison position (see Fig. 2}. and move it laterally to position over the writing platen 5, then lower it so that its point will rest upon the paper strip {not shown) passing oversaid platen, and then move the 'tracer over the paper to inscribe thereon the message to-be transmitted. the tr o r 8 ion and over the surface of the paper, the roller contacts'lel, 15 will be'moved by the arms 9,

,12 and 10, 13, respectively, to dififerent posh tions betweenthe opposite ends of the rheostats 1.6, 17, respectively. the roller con tacts are thus moved, currents, varyingin strength in accordance with the dill'erent positions assumed by said rollercontacts along the rheostats 1 6, 17, will be shunted through the said rheostats and the arms 19, 18 into the main line circuits, heretofore described,

leadingto the receiving. instrument 2 of 2 and assing through the vertically movable coils 415 and 53, cell 40 beiu included in the righthand main line circuit which is supplied with current through rhcostat 11' and arm 12, While coil is included in the left hand main linecircuit which is supplied with'current through rheostat 1? and arm "the operation of 1 of this circuit so as to lo:

l6. coils 46 and 53 will, as is well understood. by those :t'an'uhar with telautograplnc appara*=f;us, with the springs 58, control the position of the coils 46, 5 3 vertically on the cores 55 oi. the field magnet 56, these coils The currents thus passing through the being moved downwardly as the strength of the currents on the main lines increases. and,

upwardly as said currents (lCCI'GHbO. in strength. the coils are thus moved vertically, they will, through the chains 57 and segmental pulleys ol (around which two urns oi the chains are taken), move the thereof is deemed unnecessary here, except i in so far as the combination relay 51, and.

the parts cont-rolled thereby, are concerned,

which will presently be described in detail.

Llo as the right hand main line circuit is concerned, it performs, during the transmitting operation, simply the function of controlling the vertical. movements of the coil 46, The left hand main line circuit,

-however TiElfOlIllS not 0111 i the function of controlling the vertical movements of its coil fii-lfl'hut also the function-of controlling, th ough the combination relay 51, various local circuits in the receiving instrument, in-

cluding that from battery 46 (which is a battery when the station is rcce1v-= l i'cal "l for energizing field magnet 56. As

soon as cin'rcht: traverses the left main line 1 ci cuit of i, relay 51 is, of course, en and attracts its armature '(lae thus the local circuit heiore referred td,

1 a l,-consisting of Wires 2?, 59, loch magnet 80, wire Gl, field magnet 56, coi'itacts ea", 6, and wire (56, to battery 1, with the result is energized for 4-43, 53. Lock by the closing the uuister switch 3 against movement from normal position. as "a ly des ribed in my aforesaid prior application. .inis local circuit remains closed so long as there any current on the left hand main ine wires, and as soon as the lcl't main line :uit is broken, by shifting the i switch Jifrom the position indicated in Fig.

that sa fl magnet is 4- to its in Jlllll. position indicated in Fig. 53. I

this local circ it is, of course, broken.

The vertical movement of the coils 46, ill" controls the lateral movements of the receiv ing pen so that theywill correspond with tlu lateral movements of the transmitting tracer,

magnet is energized and deie'nergized,

10 controlled by the combination relay 51.

The armature 74* of this pen lifter magnet has depending arms pivotally connected at their lower ends to a bracket 7 5 on'which said magnet is supported, so that, as saig sai armature will swing inwardly and outwardly over the cores of the magnet. The armature is held normally in its retracted position, from over the cores of magnet 73",

by a spring (notshown), aud'is provided with a rod ?6 against which the pen arms 70", 71 rest. In the retracted pcsition of the armature 74: and, therefore, of this penarm rest 76, the receiving pen 72, when at unison, will lie in its resting place (an opening. in an, ink bottle, as described in my prior appl cation aforesaid), and when over its writing ficld, will rest against the surface of the paperstripon which it is to record the message received. When, however, the pen lifter magnet 7 3 is energized, its armature 74, and, therefore, the pen-arm rest 76, will swing outwardly over the cores of said magnet and thereby move pen arms 70*, 71, and, therefore, the receiving pen 72, outwardly so as to move said receiving pen outwardly from its place of rest at unison or away from contact with the paper strip on which the message is being recorded.

The energization of magnet 73 is effected by battery 4*, in the closed condition of the left hand main line circuit, through a branch circuit from the field magnet circuit just described, consisting of wire 77 leading from the winding of magnet 56 to magnet '73,

wire 78 leading from said magnet 73 to a contact 79 (fixed at one end in one end of a tube 80 and the opposite end of which contact is flexible and loose), a second contact 81. rigidly fixed in the opposite end of said tube 80 (and. between which and the free end of contact 79 there is a certain amount of looseness so that the free end of contact 79. may have a certain amount of play relatively to contact 81 with which,

however, it is normally in engagement), and wires 82, 83 leading from contact 81* to the wire 62 of, the circuit of field magnet 56*. Tube 80 is preferably of glass and is closed 60 to the atmosphere so as to prevent oxidation of its contacts 79, 81

From this construction it results that on the closing of the left main line circuit, by the shifting of the master switch 3 (Fig. 1)

to the position shown in Fig. 4, the relay 51 (Fig. 2) is energized and the circuit for field magnet 56" thus closed by the movement of contact plate 63 into enga ement with contact 65, as before described, the branch circiiit just described through pen lifting magtransmitting tracer 6 being then moved from unison position to a position above the writing platen 5, the receivin pen 72' will, following the movements 0 the transmitting tracer, take up a position in front of but out of contact with the record strip (notshown) .in its writing field. So long as the loose contact 7 9 just referred to remains in a state of rest, in engagement with fixed contact 81, the receiving pen will maintain the position just referred to in front of but out of contact with the record strip,the branch cir cuit through the pen lifting magnet 73' be ing closed by the contacts 79, 81. Means are provided, however, for, in effect, openin this branch circuit while current is on the le t main line, so that the pen lifter magnet 73 will be practically deenergized and the receiving pen thus caused to move toward and into contact with its record strip, and to thereafter move over the surface of such strip so long as the transmitting tracer remains in contact with and moves over the platen 5 or paper strip thereon. The means provided for so 0 ening this branch circuit throu h the pen ifter magnet will presently be (fescribed.

The condition of the loose contact 79" is controlled by the transmittin tracer 6, so that when said tracer is raise from its rest at its unison point, or is raised, from time to time, from the writing platen 5Jduring the writing operation, the loose contact 79 will be in a state of rest a ainst fixed contact 81 and, as just descri ed, the pen 72 be moved and held away from itsresting place at unison or from the surface of its record strip, as the case may be. When, however, the transmitting tracer 6 is lowered, from time to time during the writing operation, into contact with its record strip, this condition of loose contact 79 with relation to fixed contact 81" is disturbed, said loose contact at such times being in a state of agitation, with the result that the branch circuit for pen lifter magnet 7 3 is repeatedly interrupted so that its armature 74F and pen-arm rest 76 are held retracted by the armature spring (not shown) and pen 72 thus moved inwardly, by the resiliency of its arms 71* into contact with its record strip or into its 5% resting placeat unison, as the case may be, and Wlll retain such position so long as the transmitting-tracer 6 remains lowered and will thus, While in contact with its record strip, reproduce the movements of and. writing performed by the transmitting tracer.

The means. by which the condition of loose contact 79 relatively to fixed contact 81*.is thus controlled by the transmitting tracer 6 Will-now be described. Referring particularly to Figs; 6 to 8, it will be observed" that the tube is secured by a suitable socket "84? to .the center of a thin iron plate or diaphragm 85 provided with a flange 86 by which it is held in position on the upper end of relay 51. When said relay is energized by the current on left hand main line circuit, as heretofore described, it will at tract and pull downwardly slightly the cen tral portion of thedia hragm 85 and when it is deenergizedwill re ease said diaphragm, tube 80, of course, moving with the diaphragm. So long as the current passing through relay 51 is constant, loose contact 79 will be in a position of rest with relation to and in engagement with fixed contact 81, and thus close the branch circuit through pen lifting magnet=73t Should, however, vibrations occur in the current passing through the relay it will be apparent that I diaphragm 85 will be rapidly vibrated, and

loose. contact 79 disturbed from its normal state of rest and put into a state of vibration or agitated with relation to fixed contact 8P, with the result that the branch circuit through pen lifting magnet 7 3 will be so interrupted that said magnet will be practically denergized and the armature 74L thereof, as well as pen rest 76 therefore occupy their retracted, rearward positions,

thus leaving the receiving p nermost position at unison, or against the surface of itsrecord strip, as the case may be., Such; vibrations in the left main line circuit are produced by the lowering of the transmitting'tracer- 6, as will now appear.

Referring to'I ig.1,it will be observed that the transmitting instrument is provided with an interrupter magnet 87 included in a local circuit of battery 4.- consisting of wire 27 from positive pole of battery 4, contact 25, plate 26 of master switch 3, contact 24, wires 23 and 28, wire 88 to contact 89,arn1ature 90, wire 91 leading therefrom to magnet 87, wire 92 leading thence to'the primary winding 93'0fa'the induction coil, and wires 94 and l9leadin'g from the latter to the negative pole of battery 4 to ground. For the purpose of avoiding sparking at the contact 89 and. armature 90, as the latter is repelled, a shunt circuit 95 containing a condenser '96, is formed, from wire 88 to armature 90, around contact 89. It will also be observed that a short circuit is provided around the primary winding 93 of the induction coil,

en 72 in its in-- consisting of wire 9? connecting wire 92 with a contact plate 98, pivotally mounted in a bracket 99 (from which it is suitably insulated), a contact 100 passing through but tact stop 100 and breaking the short circuit around the primary-"winding 93 of the induction coil. With these two circuits the interrupter magnet 87 and its armature 90 are operated continuously, through one or the other, so long as the master switch 3 remains in transmitting position (Fig. at) with its contact plate 26 connecting contacts 24%, 25.

In the raised position of-t-he transmitting tracer 6, the short circuit around primary winding 93 of the induction coil is closed by the engagement of contact plate 98 and contact 100 under the platen 5, so that the current from battery i does not pass through the primary winding 93 but by wires 101, 20 and 19 to the negative pole of battery i, no vibrations therefore being produced in the main line circuits. with the resultthat loose contact 79 in tube 80' (Fig. 2) above combination relay 51 will be at rest against fixed contact 81 and thus properly close the circuit through pen lifting magnet 73 to cause it to attract its arnmt'ure 'Pi and move and hold the receiving pen 72 in its outer position away from the surface of its record strip. When, however, the transmit ting tracer (3 is-lowered towriting position and therefore depresses platen v 5, the contact plate 98 will be depressed (by pinl02) out of engagement with contact 100, thereby opening this short circuit. The interrupter current will thereupon pass, by wires 92, 94, and 19 through the primary winding93 to the negative pole of battery at and thus in duce vibratory currents, superposed upon the right and left hand writing currents. Each time the tracer 6 is raised, primary winding '93 is short circuited. The vibra tory currents thus traversing the two main line circuits, while the transmitting traceris lowered, serve to vibrate slightly the operating parts of the receiver and thus overcome their friction of rest so that they may be more easily operated; while; thevibrations in the left hand main line serve the additional. function, heretofore referred to, of keeping the loose contact 79 (Fig. 2) above con'ibination relay 51 in a. state of agitation so that ,the pen lifter magnet circuit is interrupted and pen lifter magnet 73 practically decncrgized with the, result that its pressed thereby breaking contact with conits writing platen to trace or write the nicearmature 745" and pen-arm rest 76 are retracted and permit receiving pen 7:2 to approach and rest against the surface of its record strip, which position it will retain, reproducing on'said strip the"writing produced by the transmitting tracer, until the tracer (3 is again raised.

The armature 64: (Fig. 2) of relay 51 is of large area and comparatively thick, (being preferably of the dislrshape shown) so that, unlike the delicate, loose contact 79 and tube S0,-it is unaffected by these vibrations on the left main line circuit but, notwithstanding them, maintains contact plate 63 in engage ment with contact (35 and thus maintains the circuit from battery 43, for field magnet 56 and lock magnet- 60, closed. It will also be observed that in its normal retracted position, the free end of spring contact plate (3% rests against armature 64, being engaged by a contact 103 on the under side of the armature; While in its attracted or raised position, the armature is moved away, from spring contact plate 623 leaving it in engagement with contact which limits its upward movement, as shown in Fig.- 2.

It will, of course, be understood from the description above given of the devicesfor efiecting the to and fro moven'ients ofthc receiving pen relatively to its recording strip or place of rest at unison, and the brief description preceding it of the devices for effecting the movement of the receiving pen over its recording strip to reproduce the writing.-.performed by the transmitting tracer tliat, starting with the transmitting tracer at unison or in its normal position, the first movement given it by the operator is to raise it and then move it laterally to a position over the writing field of platen 5, and it willalso be understood that the receiving pen will at'the same time be withdrawn from its place or rest at unison? and then moved (as the tracer is moved) laterally to a position over the writing field of its recording strip; The transmitting tracer being then lowered onto platen 5, the re ceiving pen will he moved inwardly intd contact with its recording strip, and the transmitting tracer being thenmov ed over sage the receiving pen will'be correspondingly movcdover the surface of its recording stripreproducing thereon the writing pe formed by the tracer. When the tracer is raised to dot an i or cross a t or to make a change or correction in matter pre' 'viously written or to begin a new line,the

incloscd in a receptacle comprising a pair of contacts loosely engaging each other whereby, when vibrations occur, in the main line circuit, one agitated relatively to the other and thus correspondinglv interrupts said second circuit, substantially as described.

2. T he combination with a main line circuit, of a second circuit, and circuit closing means controlling said second circuit and inclosed in a receptacle closed to the atmosphere, said circuit closing means comprising a pair of contacts loosely engaging each other whereby, when vibrations occur in the main line circuit, one is agitated relatively to the other and thus correspondingly interruits said second circuit, substantially as scribed.

The combination with a main line circuit, or" a relay controlled thereby, a second circuit, and circuit closing means controlled by said relay and in turn controlling said second circuit, said circuit closing means be ing inclosed in a receptacle closed to the atmosphere and comprising a pair of contacts loosely engaging each other whereby, when vibrations occur in the main line lrcuit, one is agitated relatively to the other and thus correspondingly interrupts said second circuit,substantially as described.

4. The combination with a main line circuit, of a relay controlled thereby, a second circuit, circuit closing means controlled by said relay and in turn controlling said sec- 0nd circuit, a third circuit and circuit closiug means therefor also controlled bythc' relay, said latter circuit closing means comprising a pair ofcontacts loosely engaging each other whereby, when vibrajions ()CCl'l'i' in the main line circuit, one is agitated rela tively to the other and thus correspondingly interrupts said second circuit, substantially as described.

In testimony whereof, l have hereunto set my hand, in the presence of two subscribin a witnesses.

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