US234663A - Signal and switch apparatus for telephones - Google Patents

Description

(No Model.) 4 Sheets-Sheet l W. J. DUDLEY. Signal and Switch Apparatus for Telephones- No. 2 4,663. Patented Nov. 23,1880.

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"PETERS. PHOTO-UTMOGRAFHER. WASHINGTON. D C.

(No Model.) 4 Sheets-Sheet 2 W. J. DUDLEY. Signal and Switch Apparatus for Telephones- No. 234,663. Patented Nov. 23,1880.

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RPEI'ERS, PHOTD-UTHOGRAFHER. WASHINGTON. D C.

(No Model.) 4 Sheets-Sheet 3.

W. J DUDLEY. Signal and Switch Apparatus for Telephones- No. 234,663. Patented Nov. 23,1880.

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NJETERS. FNOTO-UTNDGRAPHER, WASHWGTON D C.

UNITED STATES PATENT OEEie \VALTER J. DUDLEY, OF BOSTON, MASSACHUSETTS.

SIGNAL AND SWITCH APPARATUS FOR TELEPHGNES.

SPECIFICATION forming part of Letters Patent No. 284,663, dated November 23, 1880,

Application filed April 16, 1880.

To all whom it may concern Be it known that I, WALTER J. DUDLEY, of the city of Boston, State of Massachusetts, have invented Improvements in Electrical Apparatus for TransmittingMessa ges, of which the following is a specification.

This invention relates to that class of instruments or apparatus and the connections through which, by means of electric currents, messages are transmitted, either orally, by sounds, signs, or by means of recording-characters; and the objects of my invention are, first, to dispense with all batteries upon a line except at the central or main station, except such relay-batteries as the extended length of the line may render necessary; second, to sound the alarm-call at any desired oifice upon a line connected by a single wire, and not sound such call at any ofice except that for which it is intended; third, to enable any minor office upon the line to call the central ofiice without disturbing or sounding such call in any minor office; fourth, indicat, ing by a dial and pointer or other means at every ofice whether the line is in use or not; fifth, indicating at the calling-office whether its call has been correctly received at and transmitted from the main office; sixth, when a mes sage is sent from one office to another, to prevent the reception of the same at any omce except that for which it is intended seventh, to dispense with the main office, if deemed advisable, and in such case enabling each minor office to signal and transmit messages to the other offices without the aid of a main office 5 and myinvention consists in certain of the instruments and apparatus shown in the annexed drawings,and in the combinations and arrangements thereof, all as will be hereinafter fully explained.

Figure 1 is a top or plan view of the polechanger, which I employ in the main office when there is such an office uponthe line, and which is employed in each office upon theline when the main office is dispensed with. Fig. 2 is an inverted or under-side plan view of said pole-changer. Fig. 3 is a top or plan view of my improved indicator and automatic switch, which I employ in the main office and also in each minor ofiice on the line. Fig. etis an end view of Fig. 3 as viewed from the top thereof (No model.)

in said Fig. 3. Fig. 5 is a side elevation, as viewed from the left-hand of Fig. 3, the dialplate and its supportiug-standard being removed. Fig. 6 is a side elevation as viewed from the right in Fig 3, the standard which supports the ratchet-arbor being broken away. Fig. 7 is aside elevation similar to Fig.6, but with the telephone-lever, its connecting-disk, the closed circuit-key, one of the helices, one of the standards of the automatic lever, the right-hand side of the support in which are arranged the stops of said lever, and the righthand support of the ratchet-arbor all omitted or broken away the better to show the interior parts.

The views on Sheet 9: show the method of arranging and connecting the apparatus of the main ofice with minor offices upon the line.

I will first describe the circuit-interruptin g and pole-changing instrument shown in Figs. 1 and 2, in which A represents the usual nonconductiug bed, to which the other parts are attached, whereof 1 is the pole-changing lever, which is rigidly secured to shaft17,upon which is secured cam 41 of the pole-changing devices to be described. The elastic key2 is secured to bed A beneath bracket 3, in which latter is threaded the usual adjustable contact-screw 4.

The stops 5 and 6 are arranged to arrest the vibrating lever 1 when actuated in either direction for the purpose of reversing the current. Cup 7 receives line-wire 10. Cup 8 receives wire 11, which grounds at 42. Cup 9 receives positive wire 12, connecting with battery 13, and cup 210 receives negative wire 14, which also connects with battery 13. The foregoing parts are shown in the top or plan view, Fig.1.

In the inverted or under-side view, Fig. 2 the cam ellis shown secured upon shaft 17,which is actuated by lever 1, as stated, and which actuates the four springs next to be described. Spring 22 is secured to block 23, spring 24 is secured to block 255, sprin 26 is secured to block 27, and spring 28 is secured to block 29, each of said blocks being secured to bed A, as shown, and thereby securing said springs in position.

A block, 30, secured to bed A, has threaded in it two adjustable contactscrews, 31 and 32, and is itself connected by wire 43 to cup 10, as shown. A similar block, 33, has threaded in it the two adjustable contact-screws 34 and 35, and is itself connected with cup 9 by wire 44, as shown.

A crank, 15, is secured to and serves to rotate shaft 16, which is mounted in bearing 40, and on which is rigidly secured cylinder 18, the periphery whereof is divided into four sections of ninety degrees each, two of which (shown at 19) represent contact and two (marked 20) represent insulation, and as said cylinder 18 is so rotated the elastic contactspring 21, which rests upon said cylinder, will make and break contact twice in each revolution of said cylinder.

A switch-spring, 36, secured to block 37 at one extremity, is arranged to be forced into contact with adjustable screw 38 by cam 41 when the latter is in a central position, as shown in Fig. 2, and to be released from said screw when lever I is in contact with either stop 5 or 6, Fig. 1, and a wire, 45, connects stud 39 (in which contact-screw 38is threaded) with cup 8, which is in contact with blocks 27 and 29, as shown.

A wire, 46, connects spring 21 and cup 7, while a wire, 47, connects said cup with bracket 3 of Fig. 2, and a branch wire, 48, connects wire 47 with switch-spring 36, and a wire, 49, connects bearings 40 with block 23, while a wire, 50, passingthrough bed A, connects key 2 with block 25.

When lever 1 is in the position shown in Fig. 1, cam 41 being thereby in a central or neutral position, the line and ground wires are connected as follows: From ground 42 wire 11 leads to cup 8, thence wire 45 leads to stud 39, thence by its screw 38 and spring 36 to blocks 37, thence by wires 48 and 47 to cup 7, with which line-wire 10 connects, as before stated.

In order to transmit a positive current through the circuit, lever 1 is moved into contact with stop 6, thereby bringing spring 22 into contact with screw 34 and spring 28 with screw 31, and at the same time releasing spring 36 from screw 38, when the current will flow through the following conduits: From battery 13 by wire 12 to cup 9, thence by wire 44 to block 33, thence by screw 34 and spring 22 to wire 49, thence by said wire to bearings 40, thence by said bearin gs to shaft 16, thence to metallic cylinder 18, thence to contact-spring 21 when said spring is not insulated upon sections 20, thence by wire 46 to cup 7, thence by line-wire 10 to minor stations, returning by ground-wire 11 to cup 8, thence by spring 28 to screw 31, thence through block 30 and wire 43 to stud 210, thence by wire 14 to battery.

In order to transmit a negative current through the circuit, lever 1 is moved into contact with stop 5, thereby causing cam 41 to bring spring 24 in contact with screw 32 and spring 26 in contact with screw 35, and also 1 releasing spring 36 from contact with screw 38, when the current will flow through the following conduits: From battery 13 by wire 14 to cup 210, thence by wire 43, block 30, screw 32, spring 24, and wire 50 to key 2, thence by bracket 3 and wire 47 to cup 7, thence by linewire 10 to minor stations, returning through ground-wire 11, cup 8, spring 26, screw 35, block 33, wire 44, cup 9, and wire 12 to said battery 13.

In Figs. 3 to 7, which, as stated, are views of theindicator and automatic switch, B is the non-conducting bed-plate on which the several parts are mounted, first among which are the helices 51 and 52, (of an electro-magnet,) which are mounted and arranged in the usual manner. A vibrating lever, 53, carrying the polarized armature 57, (responsive only to positive line-currcnts,) is mounted upon its arbor 54, which is pivoted in standards 55 and 56. A slotted standard, 58, through which lever 53 passes, has threaded in it the adjustingscrews 59 60, Fig. 7, by which the scope of motion of lever 53is governed. A depending arm, 62, is secured in said lever, and to it is attached the usual elevatin g-sprin g 6].

In the two standards 63 and 64 is journaled the arbor 65, upon which are rigidly mounted the ratchets 66 and 67, the teeth of" each of which are arranged in the opposite direction to the other, as shown. A pawl, 68, pivoted to lever 53, engages ratchet 66, and by the vibratory movements of said lever serves to actuate said ratchet, and therewith arbor and its several attachments. A relief-pawl, 69, secured to bed B, serves, by its contact with ratchet 66, to secure the same from retrogression, and the free end oflever 53,formed as a pawl, as shown in Figs. 5, 6, 7, is engaged at each descent by'a tooth of ratchet 67 at the instant that the action of pawl 68 ceases, thereby arrestiu g the rotary movement of said disks, and the scope of motion of said lever is such that said ratchets will be advanced exactly the space of one tooth at each descent of said lever.

- Upon shaft 65 are rigidly mounted the disks 72 and 73, the periphery of 72 consisting of contact-surface, except the one short are of insulation, shown at 74, while the periphery of 73 consists of insulation, with the exception of the are 75, which is, in theory, coincident in extent with insulation 74, but in practice is slightly wider, to compensate for the inevitable variation in machinery and to insure continuous contact with one or the other of said disks, which said contact is effected by the an equivalent means. Upon the opposite side of the ratchets a disk is mounted upon shaft 65, having two faces, respectively marked 7 9 and 80, and subdivided by a concentric groove, as shown. Said face 79 consists of two arcs of contact-surface separated by the short arcs S1 of insulation. as shown in the detached elevations. Said face 80 consists of two arcs of insulation corresponding to the contact-surface of 79 and separated by the short arcs S2 of contact; and the contact-sprin gs 83 and 81, which respectively bear against said faces, as showii, are so arranged that when spring 83 is insulated by an are, 81, of face 79 spring Set is in contact with an are, 82, of face 80, and when spring 83 is in contact spring 84 is insulated, both of which conditions will occur twice at each revolution of said disk.

A pin, 85, is secured in ratchet 67 at such distance from its axis that it will enter hole 97 in disk 79, while pin 86 secured in standard 64 enters a hole, 98, in disk 80. Aspring, 90, secured to bed B and engaging the concentric groove in said disk, serves, when undisturbed, to engage the disk with pin 85, and when so engaged the disk revolves coincident with shaft and its ratchets. To disengage said disk. from pin 85 and engage it with pin 86 the telephone 94 is removed from lever 87, which is pivoted on stud 88, when the contractile force of spring 93 will raise the long arm of said lever, thereby forcing the short non-conducting arm 89 against spring 90, which will slide the disk into contact with said pin 86, when hole 98 in 80 is brought coincident therewith, as will be explained.

When the telephone is supported on arm 87, as shown, said arm is in contact with the vertical rod 91; but when released from said arm it rises into contact with rod 92, thereby breaking contact with 91, said rods being provided, by means of springs, weights, or other means, with such limited automatic movement that said lever, when rising or falling, will not break existing contact with one rod until it forms contact with the other, so that it is always in contact eitherwith one or both of said rods.

A closed-circuit key, 95, of usual construction,is secured to bed B, and a contactbracket, 96, is arranged in the usual relation thereto,

as shown.

A dial, 71, is so secured to standard 63 that shaft 65 will project through the central hole therein, and a pointer, 70, is rigidly secured to such projecting end of the shaft, and thus a positive current, which renders the machine operative. Said current enters by main-line wire 10, secured in cup 103, as shown, when, it spring 76 is in contact with disk 72, as shown, it flows through wire 104, spring 76, disk 72, shaft 65,standard 63,wire 107, helices 51 52, wire 108, standard 64:, shaft 65, disk 80, spring Sat, wire 109, stud 88, arm 87, stop 91, wire 110, key 95, bracket 96, wire 111, cup 112, line-wire 10, and thence to next station. If lever 87 were in contact with rod 92 instead of 91, then, instead of the current passing through rod 91 to wire 110, it would pass through rod 92, wire 116, telephone 94, wire 117, and thence by wire 110, as in the other case. Said positive currents rendering the helices operative, the armature 57 is thereby actuated as the current is intermitted by the rotation of the interru 'iter-disk 18, Figs. 1, 2, as before described, thus reciprocating lever 53, which, by pawl 68, will actuate the ratchets 66 67 tooth by tooth, as before described, thereby carrying pointer forward one figure on dial 71 at each such movement ofthe disks until said pointer arrives at thenumber on said dial which corresponds with the number of the office where it is situated. When said pointer so arrives at its office number spring 76 will be thrown out of contact by insulation-arc 74 of disk 72, and spring 77 will at the same time be brought in contact with are of disk 73, when the path of the current will be as follows: By main-line wire 10 to cup 103, wire to polarized bell 113, by wire 106 to cup 114, wire to spring 77, disk 73, shaft 65, standard 63, wire 107 to helices 51 52, wire 108 to standard 64, shaft 65, disk 80, spring 84, wire 109, stud SS, arm 87. stop 91, wire 110, key 95, bracket 96, wire 111, cup 112, thence by main-wire 10, which course of the current, if the same be changed to negative by the pole-changer, Figs. 1, 2, will ring polarized bell 113, which is responsive only to negative currents, lever 53 remaining inoperative, as the polarized armature 57is notsusceptible toanegative current.

1 willnow describe themode of signaling the main office from a minor office, the mode of calling the desired minor office from the main ofice, the mode of transmitting messages to the called ofitlces and no others, the mode of restoring the indicators at the several stations to zero, and the means of restoring the said indicators to their proper position in case of their becoming displaced.

I will suppose that office No. 5 desires to communicate with office No. 10, and that the pointer 70 at all the offices stands at zero on dial 71, as shown in Fig. 3; that bell 113 and telephone 94 at the main office Oarein circuit, and at such time the telephones at all the minor stations .are' in circuit and lever 1 of the polechanger is at stop 5, Fig. 1, thereby sending a negative current through the line, as before described. The operator at said office 5 will now actuate key 95, Fig. 3, thereby ringing the single tapper-bell 113 in the main office. He will then release his telephone 94 from lever 87, and with the telephone he will notify the main office that he desires to communicate with office No.10. Whereupon the operator in the mainoffice willmove lever 1 from stop 5 to stop 6, thereby rendering theline-current positive, and will next actuate the interruptercrank 15, thus making and breaking contact between disk 18 on crank-shaft 16 and the contact-spring 21,'as.before described, thereby sending an intermittent positive current through the line, which will actuate the several instruments B, as described, until their respective pointers 70 indicate the desired number, l0, on dial 71 in each office,'whereupon lever 1 will be reversed to stop 5, when the negative current will actuate the single tapper polarized call-bell 113 in said office No. 10 as key 2 is actuated. and in no other oflice, which resultis accomplished in the following manner:

When the pointer 70 is at zero, then in every minor ofice upon the line spring 76 is in contact and spring 77 is out of contact with their respective disks; but when the pointer in each office arrives at the number on its dial which corresponds with the line number of such office, then spring 76 will be insulated and spring 77 in contact, the pointer at each office being so adjusted upon shaft in circumferential relation to arcs 71 and 75 of said disks, and springs 76 77 being of such length that when the pointer arrives at the office-number upon the dial spring 76 is so insulated and spring 77 in contact, whereby the current, instead of passing through wire 104, will pass through wire 105 to the bell, which condition will exist at minor office 1 when ratchets 66 67 have moved one tooth from zero and at office 2 when said ratchets have so moved two teeth, but will then have ceased to exist at office 1 by reason of the reversal of the contacts of said springs, (and so necessarily at each office,) so that when the pointers reach 10 on the dials the connections with bell 113 will have been successively formed and broken at the offices numbered from 1 to 9, and such connection will then only exist at said office numbered 10, whereby when the negative current is sent through the line-wire, as already described, it will sound the polarized call-bell at said office No.10, while the bells at all the other offices are silent and as the said pointers at every office on the line will so stand at 10, the respective operators therein will be thereby notified that the line is in use, which fact is always indicated when said pointer is in any position except at zero, and the operator at the calling-oftice 5 is also informed by the position of the pointer at 10 that his call has been received at and duly transmitted from the main office.

Upon the sounding of hell 113 in office 10, as described, the operator therein will remove his telephone from lever 87, thereby bringing the telephone into circuit, as before described,

and the desired communication will then be made between said office 5 and office 10. When the operator at station 5 removed his telephone from lever 87 the spring 93,'acting upon said lever, would slide the double-faced disk 79 80 into contact with the stationary pin 86,thns releasing it from pin 85, and thereby maintaining the then existing contact and insulation of springs 83 S4 relatively to disk '79 80, as said disk would be held stationary by said pin 86. But at all the other offices upon the line said disks would move coincident with the ratchets, it being understood that the insulation-arcs S1 81 upon 79 and the contactarcs 82 82 on 80 'at each office are arranged upon the circumferential line of the disk at the same distance from each other as corresponds with the angular distance from zero on dial 71 to the indicating number of such office. Thus, if there were nineteen offices upon the line with a dial marked from zero to 19, the arcs 81 upon the instrument at office No. 10 would be arranged at one hundred and eighty degrees from each other, as would also be the contact-arcs 82 on disk 80, in orderthat when the pointer reached 10 on the dial, which would be half the circuit thereof, the contact and insulation of springs 83 84 would atsuch oflice No. 10 be restored as beforethe movement of thedisk commenced, and with said disk in contact with pin 85. Then when the ratchets move from zero one tooth at all the offices except No.1 the contact and insulation of springs 83 84 would be'reversedthat is, the spring 63 would be brought into contact and spring Salinsulaied. \Vhen the ratchets moved two teeth such reversal would take place at oflice 1, while the original condition would be restored at office 2; and thus as the ratchets were moved forward the conditions of said springs would be restored, as at starting, at each office as the pointer reached the office number on the dial, and this by reason ofthebefore-described coincidence between the positions of the office numbers on the dial relatively to zero and the distance apart of insulation-arcs S1 at the same offices, and the coincidence of contact-arcs 82 relative to such insulation-arcs 81, as before described.

\Vhenever spring 83 is in contact the currents pass from disk 79 direct through said .spring, and by wire 118 to cup 112, thereby avoiding the telephone-arm 87 and its connections and key 95. After the exchange of messages, as described, or when time is up by the line rules, the current is again changed to ]')OSlil"G, when the interrupter is actuated and the pointer is moved forward to zero on its dial, which result will be simultaneous in the main and all the minor offices, whereupon lever 1 will be removed to stop 5, as at first.

When battery-telephones are employed in connection with my invention they will be operated by the negative current, and the bell employed with such instruments will not, it is believed, be effected by the fluctuations caused by telephonic transmission but should the bell IIO be thereby affected a suitable switch may be arranged in connection with lever 87 to out out the bell, when arm 87 rises by reason of the removal of the telephone therefrom,

When magneto-electric telephones are employed with my said invention arm 1 mustbe in central position, as shown in Fi 1, with cam 41 in a central position, as shown, while telephonic communication is being carried on, and at such time spring 36 will, as before specified, by its contact with screw 38, close the circuit, while battery 13 will be thrown out.

If, from any cause, the pointer 70 of any machine upon the line should lose its coincidence of movement relativelyto the other machines,

. all such derangements of movement are rectitled by means of the following devices:

A lever, 99, is pivoted at or near its center in standard 58, and carries at one extremity a polarized armature, 100, which is so arranged relatively to the poles of the helices as to respond. to a negative linecurrent. When armature 100 is released from said poles the opposite end of said lever is seated upon stop 119 by the action of spring 120, thereby bringing the end of the lever into the path of pin 102 in the face of ratchet 66, a delicate angle-spring, 101, being so secured to said lever as to extend slightly beyond the end thereof, and yet, by its yielding, allow said pin to be brought in direct contact with the end of the lever, which contact will occur at the moment when the pointer 70 arrives at zero on its dial. Hence, if any of the pointers were out of position relatively to the others, all would be successively arrested by said lever and so brought into coincidence at zero. After such general connection or adjustment of said pointers a negative current is sent through the line-wire, thereby depressing armature 100 upon the poles of the helices and releasing the opposite end of the lever and its'spring from pin 102, when by releasing the armature the opposite end of the lever will be sustained by spring 101, the angle whereof, which is parallel with the axis of the lever, will rest on 7 pin 102 until the ratchets are again rotated.

By the term polarized armature I mean either a permanent]y-magnetized steel armature or a soft-iron armature polarized by the inductive action of a permanent magnet.

Instead of a pole-shifter and battery at a main or central office only, the same may be located in every office upon the line, in which event the main office may be dispensed with; but I prefer the system of employing a central office with such battery and pole-shifter in such office only.

I claim as my inventiou 1. In combination with operative rotative devices, the double disk having faces 79 80 and removably connected with such rotary devices, such faces being each provided with the described insulation and contact arcs arranged upon the periphery thereof in the same angular relation to each other as is the office number to the zero-mark upon dial 71, and the springs 83 84, with their connecting-wires, and so arranged that when the disk is carried forward with the rotary devices the conditions of the contact and insulation of said springs will be reversed when the pointer moves from zero on the dial, but when said pointer is at its office-number upon said dial said springs will resume their first conditions of contact and insulation, whereby, when said pointer reaches its office-number in the office that is called, the Contact and insulation of said springs and disks will c use the C e to pass through the connections of telephonearm 87, as specified.

2. In an electric indicator and automatic switch, the double-faced disk 7 9 80, having the respective insulation and contact arcs, as described, and arranged to make and break contact with springs 83 84, as set forth, and having the holes 97 98 formed iii the respect ive planes of such disk in longitudinal coincidence, the pin 85, secured in ratchet 67, and pin 86, secured in standard 64, whereby when said disk is in contact with pin 85 it is car ried around with said ratchet, but when in contact with pin 86 it is held from rotation and the relative conditions of contact and insulation of said springs remain unchanged.

3. In combination with the double-faced disk 79 80, having the described respective insulation and contact surfaces or arcs, and arranged to make and break contact with springs 83 84 and to be locked in position or carried forward with ratchet 67, as specified, the spring 90, engaging in the concentric groovein said disk, and the an gle-lever S7, engaging said spring by its non-conducting arm, and so arranged that when pointer 70 is at zero and telephone 94 is removed from said lever and such lever is raised by spring 93 said disk will, by said lever, be moved into contact with pin 86, and be thereby held from rotation, thereby maintaining telephonic connection at the callingoffice, all substantially as specitied.

4. In combination with the double-faced disk 7 9 80, constructed and arranged to make and break contact, as specified, and to be carried forward with the ratchets, or to be locked in position, as described, the angle-lever S7, pivoted at 88, formed with a lifting spring or weight and suitable stops to governthe scope of its movement, and arranged to engage and actuate said disk by its non-conducting short arm when relieved of the telephone, substantially as specified.

5. In combination with the rotative devices, the lever 99, provided with its polarized armature 100, arranged relatively to the poles of the helices, as shown, and with its angle-spring 101, and having a support, 119, and so arranged relatively to stop 102 in the ratchet as to be in the path thereof to arrest the movement of the ratchet when pointer 70 is at zero on its dial, and when released from said stop by the attraction upon its armature to be supported above said stop 102 by the contact and the contactsprings 76 77, with the de scribed conducting connections of the said parts constituting the circuit, whereby by adjustin g said pole-changer a positive current may be first sent through the circuit, and may be rendered intermittent by actuating the interrupter, thereby actuating said disks through the rotative devices, and thus successively re- I versin g the contact and insulation of said springs at the minor otfices upon the line as their said pointers indicate upon the dial their respective line numbers, and thereby bringing the signal-bell atsuch offices into the circuit, so that when the number of the called office is so indicated at the main office the polechanger may be reversed and the call may be sounded upon the polarized bell in such indicated minor oflice by actuating the interruptin g-key 2 without sounding such alarm at any other office, all substantially as specified.

7. The combination of a battery, a polechanger, an interrupter, a polarized bell, the disks 72 73, suitably mounted with rotary devices and insulated from such devices, and constructed and arranged to make and break contact, as specified, the fixed dial and the pointer mounted upon the arbor of said disks, and the rotary devices, the double-faced disks 79 80, also mounted upon said arbor and having their described arcs of contact and insulation, and arranged to be locked or rotated, as described, the contact-springs to engage said disks, the telephone 94, a key, 95, and the described conducting-connections between said parts constituting the circuit, whereby by adjusting said pole-changer a positive current may be first sent through said circuit and may be rendered intermittent by actuating the interrupter, thereby, through the rotary devices, actuating the disks 72 73 and bringing the polarized bell of the called otfice into circuit to be sounded by actuating the interrupter-key 2, whereupon by the reversal of the pole-changer a negative current may be sent through the circuit to ring said polarized bell, when messages may be transmitted through the line-circuit by means of said telephone, as before described.

8. In combination with the telephone 9; and its conducting-connections, the rotary disks 7 9 S0, with their described arcs of contact and insulation, and the springs 83 84, with their connections, so constructed and arranged that when the pointer is at zero on the dial or at its own office number upon such dial said spring 83 will be insulated and 84 in contact, and when said pointer is in any other position than at zero or its office-number spring 84 will be insulated and 83 will be in contact, whereby, when said pointeris so at zero or its officenumber, the current will flow through wire 109, and thence to the telephone, but when said pointer is in any position except atzero or its office-number the current will pass out by wire 118, thereby throwing the telephone and signal-key 95 out of circuit, substantially as specified.

9. In an electrical apparatus, the combination of helices 51 52 with their respective poles, the vibrating lever 53,provided with its polarized armature 57, arranged to be actuated by said helices, a ratchet mechanism arranged to be actuated by said lever, and the supplemental lever 99, provided with its armature 100, oppositely polarized to that of lever 53, and arranged to be actuated by the helices that actuate said lever 53, with suitable devices,

whereby said supplemental lever serves to intermitten tly arrest the rotary movement which is imparted to said ratchets by the action of said lever 53, substantially as specified.

WALTER J. DUDLEY. Witnesses T. W. PORTER,

GEO. H. JENKINs.

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