US446732A - System of electric calls - Google Patents

Description

2 Sheets-Sheet. 1.

(No Model.) I Y J. E. CURRIER & D. H. RICE.

I SYSTEM OF ELECTRIC CALLS. No. 446,732. Patented Feb. 17, 1891.

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J. B. OURRIER & 1). H. RICE. SYSTEM OF ELBGTRIG CALLS.

' (No Model.) 2 Sheets--Sheet 2. i 1 No. 446,732. Patented Feb. 17, 1891.

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JACOB l3. CURRIER AND DAV ID HALL RICE, OF LOlVELL,MASSACHUSETTS.

SYSTEM OF ELECTRIC CALLS.

SPECIFICATION forming part of Letters Patent No. 446,732, dated February 17, 1891.

Application filed November 13, 1882. Serial No. 76,656. (No model.)

.To aZZ whom it may concern.-

Be it known that we, JACOB l3. CURRIER and DAVID HALL RICE, of Lowell, in the county of llliddlesex and State of Massachu- 5 setts, have invented a new and useful Improvement in Systems of Electric Calls, of which the following is a specification.

Our invention relates to that system of electric calls patented to Jacob 13. Currier April 12, 1881, August 30, 1881, and December 20, 1881; and it consists, first, in provid ing the circuit-breaking calling mechanism with a shunt-circuit and a key or other like device to send a current through the magnet and around the circuit-breaker, substantially as hereinafterdescribed; secondly, in providing for the connecting of said shunt-circuit with the line or ground, and also for the 0011- nection of the make-and-break caller-circuits with the line by a novel switch-boa'd, substantially as hereinafter described; thirdly, in providing anew form of electrical contactspring for the circuit-breakers and placing the same in a new position with relation to the armature and the electrical c0ntact-point, whereby the more perfect unison of movement is secured between the circuitbreaker and the bell-hammer and the alarm-striker operated by it, and the liability to operate any other 0 striker upon the circuit is diminished, substantially as hereinafter described; fourthly, in providing the clips which clamp the reeds of the circuit-breakers and alarm -strikers with adjustable jaws by which they may be adjusted to operate more nearly in unison and quickly and accurately, and in making such adjustable jaws to lengthen or shorten the reeds while gripping or clamping the sam e, substantially as hereinafter described; fifthly, in providing a new form of adjustable-holder for carrying and adjusting the reed-clips of thecircuit-breakers and alarm-strikers,whereby they can be more perfectly and readily adjusted at the proper distances from their magnets to prevent the latter interfering with their synchronous operation, substantially as hereinafter described.

In the drawings, Figure 1 represents an electrical circuit and battery with our improved caller, switch-board, and reed-clips. Fig. 2 is a side view of our improved switchboard. Fig. 3 is a side view of one of our improved contactsprings, and shows an end view of our improved adjustable jawclip. Fig. 4 is a front view of a portion of the caller, showing another form of our improved spring and the improved holder for support ing the reed and contact-screw. Fig. 5 is a front view of the form of contactspring shown in Fig.8 adjusted in a different position, and in a similar position to the spring in Fig at. Fig. 6 is an edge view of Fig. 5- that is, a view of the device shown in Fig. 5 taken at right angles to the position shown in the latter view. Fig. 7 is an edge view of Fig. 6 4. Fig. 8 is a side view, partly in section, and Fig. '9 an end view, of our improved clip with adjustable jaws.

In Fig. 1, A is the electrical circuit. B is the battery. 0 is a calling device of the form 0 shown in the application of said Rice filed in the Patent Office February 13, 1882. S is an improved key or switch board of the same type as that shown in said Rices application.

D D are the bells, each consisting of a gong 7 (Z, striker d, and magnet (1 of the well-known Currier form. G G are the grounds of the circuits. The caller (J is connected to the switch S by circuits 6 e, as shown in said Rices application. The battery is connected to the caller at screw-cup 1, whence the circuit leads through magnet M, line e clip 6 armature 6, electrical contact-spring e 6 and contact-screw e to the screw-cup 2 of circuit 6.

In the switch-board S the circuits 6 6 lead 8 to screw-cups s s, which are electrically connected to metallic contact-points s of the swinging switch 8 which turns on a pivot in the center of the switch-board. The base of the switch-board is wood, as also that of the caller C, thus insulating the parts not shown to be electrically connected.

Upon the caller G we provide shunt-circuits G 0 around the circuit-breakers, composed of the following parts, viz: Screw-cups 5 3 3 we connect by lines 0 o with the same pole of the magnet as the lines 2 and to screw-cups 33 we connect lines o 0', leading to screwcups 0 c on the switch-board, which are in turn connected to metallic electrical contacts I00 0 c Opposite to these, upon the surface of the switch-board, is attached the metallic segment of a circle 3 The circuitAleads from s is the central pivot of the switch-arm s connected with the ground by a line 3 (See Fig. 2.) On top of the swinging switch-arm s is attached the spring 3 and to this is connected the piston s, which plays up and down through a hole in the switch-arm, and is held in its position by the spring 3 so that it does not touch the contacts 8 or 0 just below it until it is pressed down against them. The contact-screws e in the caller are so adjusted as to be just barely out of electrical contact with the springs e e -when the latter are in a state of rest, say within one one-hundredth of an inch or less. If, now, the switch-arms be swung from the position shown in Fig. 1 onto either contact 8', the circuit will still be broken between screw 6 and spring e 6 and the circuit-breaker IE will remain motionless. By pressing 'upon the piston 5 however, its lower end is brought in contact with contacts '0 and stand the circuit is completed through 1 M and shunt-circuit C to ground, giving a pull upon the armature e of the circuitbreaker E when by releasing the piston s the armature e will be released and set in vibration, and screw '6' and spring 6 e will be brought into intermittent contact, and the circuit will be established through c e e e 'e e 2 ss' 3 to line A, and thecircuit-breaker continue to operate as long as arm 8' remains in contact with s.

It is obvious that instead of key 3 being mounted on arm 5 it may be placed separately, or a pin may be used to connect 0 to ground or line, and it is also obvious that arm 8 may be dispensed with and a key, plug, or other well-known substitute be used to connect contact s with line A without impairing the op eration of the starting device. This starting device for the caller, by means of the shuntcircuit '0 is of great advantage in the practical operation of the caller and bells in circuit as well as in adjusting and readjusting the caller to the bells.

It is found in practice that while, on the one hand, with a given battery power not more than three hundred ohms resistance can be placed in the circuit and the bells be made to ring with the screw 6' and spring a e in "electrical contact, on the other hand, with the screw and spring adjusted as described above i. a, just out of contact-under similar-con itions the bells can be rung with a resistance of from six hundred to eight hundred ohms in circuit and the quality and tone of the same produced by our improvement is equally improved. Besides this,the reed of the armature e being set so that the bell will ring when screw e and spring 6 e are so adjusted, in case such adjustment be disturbed it car be reset without diiiiculty to the same position and with certainty of ringing the proper bell, whereas when the spring 2 e and screw 6 are in electrical contact in their nor mal state of rest it is a more diflicult and delicate task to reset them if such adjustment be disturbed; If7desired,the line 8 and contact may be omitted and the starting shunt-circuit will then be through contact 0 and arm 3 to line A, when the piston s is pressed down. The advantage of the contact 3 and line 8 to ground is that a much stronger direct current can be sent through magnet M than if it were sent to ground over line A, and any desired amount of resistance maybe interposed in line s less than that of the bells and circuit A, thereby giving a stronger pull upon the armature e.

Our circuit-breaking contact-spring e e is an improvement upon that described inthe application of said Rice, before mentioned. As shown and described by him in that application, it is important to bring the pressure to bear upon said contact-spring in making and breaking the electrical contact in a direction parallel to the main spring or reed of the armature c and it is desirable to have the spring slip or rub past the stationary contact-point with as little increase of friction as possible and make a reliable contact. It is necessary, however, to use a spring of sufficient length in proportion to its movement past the contact-point to present slight resistance, as well as prevent its being upset and the perfection of the contact and time of vibration of the circuit-breaker being impaired thereby.

While a single long spring placed upon the face of the armature of 'the'circu'it-breaker by its length diminishes the direct pressure of the electric contact in making and breaking the circuit considered by itself, at the same timeit gives a greater leverage of the amount ofpressure which it does make against the main armature-reed m, and thus by its greater leverage renders nugatory its lighter contact. If the spring be made very light and short to avoid these difficulties, it becomes impossible to temper it properly. In order to overcome these difficulties and bring the contact-point as nearly in line with the main reed m of the circuit-breaker as possible, we use a double or reverse contact-spring, which is carried out ward from the armature and then returned, as shown in Fig. 3, the part 6 being that carried outward and the part c that returned toward the armature 6". By this means the length of the contact-spring is kept sufficient to give a very light contact, while the point of its pressure against the screw 6 is brought in nearer to the line of the reed m, and it exercises much less leverage against it than if it were a single spring projecting outward from the armature in the direction of c sufficiently far to give the same pressure on the point of the screw 6. At the same time (see Fig. 3) the free end of the spring a is carried along toward the contact-point as the vibration of the armature e approaches the limit of its motion toward the contact-screw, and the pressure of the spring upon the contact screw grows less and less as the power of the reed m becomes weaker in approaching the end of its beat, thus diminishing the pressure and leverage'of the contact-spring e to control 'or var; the manual rate of vibration of the reed 1n and causing any variation of the contact to affect the rate of vibration of the circuit-breaker in a much less degree. Thespring o may be made in a separate piece from 6 if desired, and of smaller and lighter proportions, and they may be united at their point of juncture or formed of one length of spring bent into the formshown. In order to further bring the bearing-point of the contactspring and its fixed contact'point in line with the reed m, we attach the spring 6 e to the armature, as shown in Figs. 5 and 6, so that the part a shall project both sidewise and edgewise from the armature and allow the part c to be returned past the edge of the reed 'm, and the contact-point of it and the screw 6 brought opposite the edge of the armature and reed m, instead of opposite its side or face. This construction brings the strain or influence of the make-and-break contact to bear transversely of the armature e and reed m,in which direction it will have the least possible influenceupon the vibration of the circuit-breaker, and whatever yielding the springs e (2 may have will be of the least possibie effect in adjusting the vibration of the circuit-breaker.

Another modification of our contact-spring is shown in Figs. 4 and 7, where the springis mounted upon the arm 6 attached to the armature e and at the middle of the spring a and the spring 6 is joined at both ends to the spring e making one of an elliptical shape, and this is the form of reverse or double spring which we prefer, because each branch of the springs c e holds the other in place and prevents it from yielding under the pressure of the electrical contact, while at the same time bringing the contact-point at the edge of and nearly in line with the reed m. Not only is our electrical contact-spring placed on the edge of the reed m, but by means of the arm parts 6 or 6 it is brought nearly opposite the center of motion of the reed m, which lies between the armature e and clip e By this means the slightest possible motion is given to the electrical con tact-sprin g e, which will cause it to effectually make and break the circuit, and its tension against the com tact-screw e is reduced to a minimum.

By the use of our reverse contact-spring, especially when placed at the edge of the reed m and opposite its center of motion, as described, it is found that the effect of the contact-pressure in making and breaking the circuit upon the reed m is reduced to its 1ninimum, and that the reed in becomes practically the governing force over the vibrations of the circuit-breaker up to two thousand vibrations per minute. Hence the retraction of the spring o c exercises very little practical effect upon the number of electrical impulses sent over the circuit A per minute, and the spring 6 6 can therefore retract or change its eontact-point to a considerable extent without affecting the ringing of the bell corresponding to its circuit-breaker, and in resetting the contact, if disturbed, it is more easily and quickly done, since so nice an adj ustment is not required as when the electrical contact is opposite the face of armature e and reed m. This becomes very important in set ting or resetting the circuit-breaker to cause it to operate bells at distant and different stations on the circuit, which require much greater nicety of the synchronous pulsations of electricity than when situated immediately adjacent to the circuit-breaker. It is also of importance because the more nearly the pulsation of the electric current caused by the circuit-breaker corresponds to the normal vibration of the reed of the bell-hammer the louder the alarm sounded on the bell for any given strength of electrical current, or, conversely, the less electric current it requires to produce a given volume of sound.

In Figs. 3, 8, and 9 are shown our improved adjusting device for adjusting the length of the reeds of the caller-armature and bellhammers. c is the clip in which they are held or gripped under a pressure as heavy as can be applied to them to prevent their being loosened and affecting their rate of vibration. it is the base which supports the clip. From this base projects a post 72/, which is made flat on the face which holds the reed m of the circuit'breakeror bell-hammer. On top of this post a and against its flat face is secured a clip 11", by means of screws n passing through threaded holes in the post a, one screw being near each end of the clip. The clip n is planed away on its bottom base about one-sixteenth of one inch deep for its entire length and for all of its breadth. except about one-sixteenth of an inch on its back edge, where the projection n" is left, Fig. 3, fiat 011 its lower face and extending the entire length of the clip. This projection or forms, in combination with the flat surface of the post n, a pair of jaws at the rear side of the post and clip to grip and hold firmly the reed m when the screws n are tightened. In the front face of the clip a is bored a hole or back as far as the lower face of the clip was cut away, or to the projection 11 This hole is of such size that its periphery, produced downward into the space where the bottom of the clip was cut away, will extend as low from its axis as the projection or jaw 112. does. Through the remainder of the clip and coming out on its back side a smaller hole 0?. is bored axial to the hole W. A piston 91 having its head 1Lexactlyiittingthe hole Wand having its shank threaded and fitting the hole at, is now inserted in the clip, as shown in Fig.8 and in dotted lines in Fig. 3. The periphery of the head n" of this piston bears upon the reed m and where it projects below the clip and forms a foot or traveling jaw .to grip the reed between it and the post n. The end of the piston is squared at a so that a wrench may be applied to it. The hole it serves as a guide to the head of the piston as it revolves around in it and keeps it traveling along the center of the reed 172, when a wrench is applied to the square end ofits shank, and it is revolved and at the same time made to traverse longitudinally by means of the threaded hole a engaging with the screw part of its shank. Inasmuch as the top part of the hole a bears directly upon the jaw 77. of the piston 11] and the latter bears directly upon the reed m, and inasmuch as the axis of the piston is parallel to the reed, it is evident that when the screws n are set down as firmly as possible the foot of the piston will always bear with the same pressure upon the reed m, as it is moved along lengthwise by turning the wrench. This is important, because anysubstantial difference in the firmness with which the reed is gripped will have the same effect in varying its rate of vibration, as lengthening or shortening the reed does under the same gripping pressure, loosening the grip on the reed being equivalent to lengthening it and tightening the grip upon it being equivalent to shortening it. By oiling the piston-jaw n and shank and face of the reed m the piston can be revolved under the greatest pressure which can be applied to the clip and post a to hold them together. The adjusting of the reed is accomplished by means of the jaw n", as described, after the clip n is clamped solidly to the post it. This device enables thelength of the reed to be adjusted to within one eighthundredth of an inch of any given length. As with reeds vibrating from five hundred and fifty to eighteen hundred times per minute, as u ed with the Currier bell, (in order to get them into a neat and practical compass,) about one five-hundredths of an inch of length in reed represents one heat of the bellhammer or circuit-breaker, the importance of an adjusting device is evident. This device is cheap and simple and not liable to get out of order and adjusts the reeds of the circuitbreakers and bell-hammers to the greatest nicety of synchronous vibration. In combination with the adjustable contact-screw e of the circuit-breaker the adjustable jaw n is especially valuable for setting thelength of its reed m, for the contact can be set properly at first and the length of reed m adjusted afterward and while it is making and breaking the circuit, which saves time and insures great accuracy in the adjustment. If the revolving jaw formed by the piston-head projects beyond the post a", or vice versa, the same adjustment can be given to the corresponding circuii-breaker clip, and thus the effect of the projecting jaw in the bell-hammer upon the vibration of the reed in either direction will be the same as in the circuit-breaker, and vice versa, and no inconvenience is experienced on this account.

To support the clip upon its base-board we employ the casting Y, turning upon the pivot g, which projects through the base-board and is, attached to the casting Y. In the casting Y is formed a slot y of semicircular form, having the pivot 3 for its center, and through the slot 12 is placed the shank of the screw M, the head of the screw being larger than the slot and itsend being threaded and entering a correspondingly-threaded hole in the baseboard. The shank of the screw 7 is slightly smaller than the slot 1 and by loosening the screw the armature maybe swung away from or toward the poles of the magnet M, when, the screw being tightened, it will be firmly secured in the desired position.

The contact-screw e is supported by the bracket f, Fig. 7, which is secured to the post a by means of the screw f which is insulated from the bracket f. Between the bracket f and post n a strip of insulating material is placed. The casting Y is connected to the magnet and is in the circuit, and the bracket fis connected to the lines 6 6, leading to the switch-board, thus forming a circuit through the spring (2 c and contact-screw c.

It is un derstood,of course, that switch-board S and caller O are to be placed in the central office and connected to the ordinary switchboard of a telephone-exchange in any wellknown manner, and that the bells and their hammers and magnets are to be respectively placed at different and distant stations upon the circuit A.

Several modifications of our main inventions may be adopted without departing from their spirit. For instance, plugs maybe used for connecting the contact-points s and line A at the axis of bar 5 and the contacts c s or c and axis of s by well-known forms of metal plates attached to the switch-board and of proper size to receive the plugs between them; also the jaw it may be divided so as to form a separate and distinct jaw under or and another under it also, in placing the spring 6 in the position shown in Figs. 5 and 6, an arm may be substituted for the part c and the advantages due to the location still remain. As the adjustable jaw a" depends largely for its efficiency upon the pressure of the screws coining directly upon it and its resting directly upon the reed m, it may be made in a separate piece from the shank part of the piston and the latter be allowed to revolve within it, if desired; or one clip 41 may be used with jaw of and another with jaw n. Neither do we confine ourselves to a round or rotating jaw of, as many other forms may be made valuable, and in such other forms the jaw may be clamped upon reed m by direct action of the screws or clamping device, provided it be adjustable, while the reed is held by other jaws during its adjustment. The essence of this part of our invention is to have one pair of jaws holding the reed m in position while another is shifted backward and forward to lengthen and shorten the reed, as described; also, the starting-circuit C may be used to advantage with the grounded line 8 to give a heavy pull upon the armature 6* when the contact-spring e and screw 6' are normally in electrical contact, especially when the "con- IIC Our improvements are especially valuable.

to cause a vibrating hammer to strike a forci ble blow upon an alarm-gong or other similar object, which givesa rebound to the hammer, and thus affects the entire system of individual alarms to which they relate.

That we claim as new and of our invention is- 1. In combination with the magnet M, connected to the battery and ground at one pole, the circuit-breaker and the shunt-circuit around the latter, both connected to the opposite pole of the magnet, substantially as described.

2. The combination, with the battery B, of two magnets M M, respectively connected to the same at one pole thereof, and two circuitbreakers E and two shunt-circuits around the latter respectively connected to the other pole of said magnets, substantially as described.

In combination with the circuit-breaker E and its magnet M in the main circuit A, and the corresponding magnet (Z and its alarm-striker cl, also in said circuit, the shunt-circuit G from the magnet M around the circuit-breaker to a ground connection, substantially as described.

a. In combination with two circuit-break ers E and their magnets M in the main circuit, vibrating in substantially different times, and the respectively corresponding vibrating alarm-strikers cl (1' and their magnets d (1 also in the main circuit, two shuntcircuits C 0 leading, respectively, from the magnets M ill and around the circuit-breakers to a ground connection, substantially as described.

5. The combination, upon a single baseboard, of the magnets M M and their circuitbreakers and screw-cups 1 and 2 2, and elecv trical circuits connecting said screw-cups l and 2 2 through said magnets and circuitbreakers, respectively, with the screw-cups 3 3, and shunt-lines c 0, respectively connecting them with said magnets, the whole being organized into a complete calling-machine, substantially as described.

6. In combination upon a single base-board, the shunt-circuit screw-cups c c and their contacts 0 0 the main-circuit screw-cups SS necting and disconnecting said eontactsfrom the latter, substantially as described.

8. The combination, in the switch-board S, of two or more contacts 5' s, connected with their respective circuit-breakers and magnets M in the main circuit, two or more contacts a 0, connected, respectively, with said magnets in the shunt-circuits C 0 with the main single circuit A and suitable mech anism for connecting and disconnecting said contacts from the latter, substantially as described.

9. The combination of a main circuit containing a magnet M and its circuit-breaker therein, with a shunt-circuit leading from said magnet around said circuit-breaker to the main circuit orground and provided with a key for closing said sh unt-circuit, substantially as described.

10. The combination of the magnet M, connected to battery B and its ground at one pole of the circuit-breaker E and the shunt circuit C connected to the opposite pole of the magnet, and the main circuit A and grounded line 5-, substantially as described.

11. The combination, in a switch-board, of the bar 8 the key 5, and the contacts 8 c placed within the path of the bar and key, rcspectively, substantially as described.

12. The combination of the bar 3 the key 3, and the contacts 8', c and .9 arranged within the path of said bar and key, respect ively, substantially as described.

13. The combination of the swinging bars and key 5 with the contact 3, adapted to make electrical contact with said bar, and the contact 0 adapted to make electrical contact with said key, substantially as described.

14. The combination of the bar 3 the circuit A, the contact 3, the key 5", and the contact 0 substantially as described.

15. The combination of the bar 5 the circuit A, the contact 3, the key .9, the contact 0 and the contact 5 substantially as described.

16. The combination, with the swinging bar .9 and the key .9, mounted thereon and moving therewith, of the contacts .9 and a substantially as described.

17. The combination, with the swinging bar 3 and the key 5", mounted thereon and moving therewith, of the contacts, the contact 0 and the contact 8, substantially as described.

18. In combination with the vibrating governing-reed m of the circuit-breaker, the reverse spring e e', and its rigid electrical contact-point against which it makes and breaks the circuit, substantially as described.

19. In combination with the magnet M and vibrating reed and armature m e, the reverse contact-spring e e and its rigid contact-point against which it makes and breaks the circuit, substantially as described.

20. In combination with the vibrating governing-reed m, the reverse contact springs joined together at one end of each, respectively, and arranged and located with relation to their electrical contact breaking-point against which they impinge, so as to come in contact. therewith in mo 'ing past it and so as' to diminish their tension against reed m toward the extreme ends of the beat of the latter, substantially as described.

21. In combination with the circuit-breaker reed m, which governs the make and break of the electric circuit, the contact-breaking spring placed with its make-and-break contact at the edge thereof, substantially as described.

22. In combination with the circuit breaker reed m, the contact-breaking spring mounted at the edge thereof and nearly opposite to its center of motion, substantially as described.

23. In combination with the magnet M, the reed m, and armature a the electrical makeand-break contact-spring mounted upon the edge of said armature and projecting above the same, substantially as described.

24. The combination of: the vibrating reed m, and the reverse springs join ed together at both ends and arranged to meet their electrical contact-point against which they make and break the circuit by the movement of the armature, substantially as described.

25. In the reed-clip e in combination with the grasping and holding jaw 77. and the lower jaw n, the traveling jaw a, substantially as described.

26. In combination with the stationary holding-jaws n n, the traveling jaw n and its guideway n substantially as described.

27. In combination with the stationary holding-jaws n n, the traveling jaw 11., provided with the screw-threaded shanks n and the correspondinglythreaded hole n", substantially as described.

28. In combination with the clampingscrews of n and holding-jaws n n, the circular cap 12 and the circular traveling jaw n, substantially as described.

29. In combination with the post 11., supporting the reed m, the bracket f, supporting the contact screw 6, substantially as described.

33. The combination, with the reed m, of the jaw n and adjustable jaw n, the contactbreaking spring 6, and the adjusting-screw e, carrying the contact-breaking point, substantially as described.

34:. The combination of the contact-spring c c with its make-and-break point of screw 6, arranged and adjusted relatively to each other substantially as described-that is to say, so that its electrical contact, when made by the movement of the armature upon which it is mounted, shall begin upon 6 nearest to the end at which parts 6 e are joined and move along said spring away from said end, substantially as described.

35. In an electrical-circuitbreaker, the combination of a main spring m, an ellipticalshaped contact-breaking spring formed of members 6 6 and a non-elastic electrical contact-point engagingwiththe latter to make and break the circuit by the vibration of the main spring, substantially as described.

36. In combination with the circuit-breaker E provided with the reverse electrical contact-breaking spring e. 6 the circuit A and the corresponding vibrating striker cl and magnet 61 substantially as described.

37. In combination with two circuit-bleakers E E provided with electrical contactcuit A and the corresponding vibrating strikers d d and their respective magnets (Z (1 substantially as described.

38. In combination with the circuit-breaker E provided with the postn, the clip if, and the adjusting-jaw n, the circuit A and the corresponding magnet 61 and spring-striker (1, provided with the like post n, clip 1 and adj usting-j aw 02", substantially as described.

39. In combination with the circuit-breaker E having its electrical contactbreaking spring 6 placed on the edge of its reed m, the circuit A and the corresponding magnet d and vibrating striker d, substantially as described.

40. In combination with two circuit-breakers E E having their respective contactbreaking springs a e placed at the edge of their reeds m m, the circuit A and the corresponding magnets (Z (Z and vibrating strikers (Z d, substantially as described.

4C1. In combination with the reed m, the jaws n it, held by the clamping-screws M 41 on each side of the reed, and the adjustable jaw '11", substantially as described.

JACOB B. CURRIER. DAVID HALL RICE.

Witnesses:

EDWARD W. THOMPSON, GEORGE F. LAwToN.

IIO

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