US49585A - Improvement in electro-magnetic telegraphs - Google Patents

Description

UNITED; STATESl PATENT OFETCE.

ROBERT EOYLE, OE NEW YORK, N. Y., AssIeNOR r.ro Einsicht Aun GUIsErrE TAGLTAEUE, OE SAME PLAGE.

IMPROVEMENT IN ELECTRO-MAGNETIC TELEGRAPl-IS.

Speoilnation forming part of Letters Patent No. 49,585, dated 'August 22, 1865.

To all whom it may concern.-

Be it known that-I, ROBERT BOYLE, of No. 298 Pearl Street, in the city, county, and State of N ew York, have invented anew and useful Improvement 1n Electro-Magnetic Tel egraphs and I do hereby declare that 'the following is a full, clear, and exact-description thereof, which will enable others skilled in the art to make a plan or top View of the same. Fig. 5 is an end view of thereceiving partof the instru'- ment. Fig. 6 is a plan yor top view of the same Fig. 7 is detached sectional view ofthe print` ing mechanism, the line :v Fig. 6,indicating the plane'of section. YFig. Sis a detached sectional View of the escapenientof the printing mechanism, in a larger scale than the previous figures. Figui) is a detached face View of the escapement-Wheel: Fig. 10 is a detached sectional view ot' one of the types.

Similar -letters of reference indicate like parts. l

. =Thisinvention relatesto certa-1n improvements in electro-magnetic telegraphs where-' jby any person desiring to send a message is enabled to preparethe same, send it tothe telegraph-office,andhave it transmitted and delivered wit-hout allowing any one to see or understand the same until'it reaches the hands of the person to whom the communication 4is to be made.

The new instrument is 4composed of three distinct parts-via., the punching-instrument, the transmitting instrument, vand the receiv in g-instrument.

The punchmginstrument, 1s lrepre.;

sented in Figs.l. aud`"2; iconsists ofa. plain disk, A, of metaly or other-.suitable material,..,

mounted' on la horizontal shaftforspindle', a.

' -''1'his disk -isf` venftnated ,with twenty-eight' holes, b, at edua "distauce'sa art, andall s itm ated on'a cirelenearfts per-ip ery. Theholes- A b correspondtoislie twenty-six lettersjothe alphabetaad tothe sign' et, generally used for ,ando forth, and one hole-is-,left blankand forms the starting point ot1 -the disk at .the beginning 'of new words. The letters of the alphabet and the sign 8*. are marked on the face of the disk opposite the holes, and a handle, bit, placed opposite the blank hole, may be' used to turn the disk. The shaft a, on which the disk is mounted,'has its bearing in a standard, B, rising from the platform which supports the instrument, and it is hollow, to receive the end of the screw-spindle 0,011 which the;1 spindle D is mounted. The screw-spindle has its bearing at one end in the hollowshat't a., and at its opposite end in a pointed screw, c, secured in the standard, E, as clearly shown in the drawings.

An arm, d, is firmly connected to the inner endl ot' the shaft a and carries a horizontal rod, e,extendingthron'gh a forked bracket, f, which Aissecured to the end ot' the cylinder. This arm transmits the rotary motion imparted to :the shaft a' and disk Ato the cylinder 1 This cylinder is made of Wood or any other sot't material, and it screws on the spindle (J, so that when 1the cylinder is rotated while the spin,

die remains stationary, the screw-thread causes said cylinder to travel in 'a longitudinal direction, or in a direction parallel to its axis. A pin, g, which projects from thescrew-spindle at right angles to the'same, by coming in contact with a stud 'insert-ed in the standard E, retains-the screw-spindle and prevents it from revolving with the cylinder.

The paper in which .the message is to be punched is stretched on the cylinder D, and the perforations are produced by the action of a punch, F, which is fastened'in a head secured to the loose end of a vertical spring or elastic standard, G, and operated by a handle, H.

i A' brake, h, bearin g against the periphery of .the disk, prevents the'same from rotating spontaneously. When' the instrument-fis inoperation said disk is tnrned'by a pin, i, inserted in one -of the holes b, 4and a stop, j, rising vfrom therplatform', limits the motion of said disk.' At'th'e .beginning ot the operation the cyl- -inderis brought in such'aepositionthat the fend' farthest from 'the disk A',is`oppositethe punch, and the disk is brought inits'starting position by- `placing the lpin into the `vblank- -hole audturning in thedirection of thel arrow` marked thereon in Fig. Ianni the saule come resented by its which is made dat at one end in cont-act with the. stop. In this position. a hole is punched in the paper to correspond to the starting-point of the message. If it is desired, for instance, to punch the word Boyle7 in the paper on the cylinder the pin t' is withdrawn from the blank hole and inserted in the hole opposite the letter 13, and the disk is.

turned with one hand in the direction of the arrow marked on it in Fig. 1 until the pin comes in contact with the stop. A blowgiven with the other hand to the handle of the punch produces the desired perforation. The pin i is then inserted into the hole opposite the letter 0, the disk is turned, and by striking the punch the second perforation is produced in the paper, and so on until every letter is repperforation in the paper. At the end of each word the disk must be brought back to the starting-point and a hole punched in the paper to correspond to the blank.

When the entire message has thus been punched in the paper ou the cylinder D said paper is removed and carried to the telegraphothce, Where the operator applies it to thelpaper-cylinder of the transmitting-instrument. This part of the instrument is mounted on a platform, A', of Wood or any other bad conductor of electricity, and it is provided with a paper-cylinder, B', of metal or other good conductor of electricity'. The diameter of this cylinder is precisely equal to the paper-cylinder ofthe punching-instrument, and said cylinder is provided with a suitable mark to enable the operator to bring the perforated paper in the correct position by placing the iirst perforation in the paper opposite to said mark.

The cylinder B' is mounted on a screw-spindle, C', the screw-thread of which is precisely of the same pitch asthat ofthe spindle C, and to t into the forked end of a standard, D', rising from the platform A', so as to prevent it from turning round with the cylinder.v The other end of said spindle is insulated by a piece of ivory, E15,

-litted to it, and it isy supported by the inner pointed end of a shaft, a', which has its bearing in an arm, Dtit, extending from the frame D* of a clock-movement, whereas the outer end of said shaft is supported-by a screw, b', secured in a staudard,'c', that rises from the platform A; l

lOn the inner end of the shaft a' is mounted a pinion, d', from which extends an arm, c', carrying a horizontal rod, f', that extends through a forked bracket, g', secured to the end of the cylinder B'. When the shaft a' revolves, therefore, a rotary motion is imparted to the cylinder B', and by the action ofthe screw-spindle, which remains stationary, the revolving cylinder is caused to traverse in a direction parallel to its axis for the distance of one thread for each revolution precisely in the same manner as the paper-cylinder of the punching-instrument. u y

The revolving motion of the shaft a' is produced by the clock-movement E', which is driven by a weight or spring, and the 4speed of which is regulated by a fan, or in any other suitable manner, and when the instrument 1s not used the motion of said shaft is stopped by a key, h', which passes through the standard c' and comes in contact with an arm, i', projecting from said shaft, as shown in Fig. 4. As soon as the key is drawn out the motion of theshat't andpaper-cylinder commences, provided the clock-movement is' wound up.

On the shaft a' is mounted a cogwheel,j', and an oscillating' pawl, t',attachcd to the armature of an electro-untguet, F', is arranged in such a position that when said armature is drawn back from the core of the electro-magnet by the action of its springs the wheel j' and shaft a' are allowed to revolve without obstruction; but as soon as the cir'cuit through said electro-magnet is closed and the armature is attracted the pawl engages with the teeth of the wheel j' and the motion of the papercylinder stops.v

The closing of the circuit is effected by the action ot' a metallic spring or finger, l', the point ot' which bears down upouthe surface of the paper on the paper-cylinder.A Wheneverone of the perforations in the paper comes under the point of said spring, causing the same to come in contact with the metallic surface of the paper-cylinder, the circuit through the helix of the electro-magnet F' is closed and the armature of the same is attracted. The pawl k' engages with the teeth of the cogwheel j' and the motion of the paper-cylinder stops; but it continues long enough to carry the point of the spring l' beyond the perforation, so that the circuit is immediately opened,y

and the stoppage of the motion of the. shaft a. is only momentary. The object of this momentary stoppage is to obtain time for the printing of each letter, as will be explained in describing the receiviiig-instrument.

In order to bring the electro-magnet F' in the circuit, one end of its helix connectsv by a wire, l5, with the stud s', which represents the earth-line, and the other end of the helix connects by a wire, 11, with the standard p', fromy which extends the spring l'. A wire, 12,' also extends from a forked standard, D', toa wire, l0, leading from the main-line stud o' to springs q" g'it, the object of which will be presently explained. Thesesprings are in metallic connection with the main battery and with the wire 15, and by referring to 'the several wires 4 in Fig. 4 it will be readily seen .that the circuit is open while the spring touches the paper; but so soon as the point of the spring, dropping into one of the perforations of the paper, comes in contact with the metal surface of the paper-cylinder the circuit is closed and the armature of the electro-magnet is attracted, as previously described. The cog-wheel .9" is provided with twentyleight cogs, and the positions of these cogs correspond to the twenty-eight letters on the disk of the punching-instrument and to the perforations produced thereby in the paper. u If the "twe'ntyeight letters and the blank are punched out in consecutive order, and the. transmittinginstrument is set in motion,the Wheelj' will stop once 'for every letter or sign, giving timeto print the' same, as will be presently explained. l

On the shaft a is also mounted the divisionwheel G', which is made of'a cylindricalV body of hard gutta-percha, india'rubber, or other tween the division'lwheel and the helix, bear on the solid metallic rims of the same, and the springs q q* q qu?, which are situated on the opposite side ot' said wheel, bear on the div-isions, and they are so arranged that when lthe springs q' q* bearlon a metallic division the springs q q* bear on`an intermediate insu lating division, and vice versa. By this arrangement, and by the peculiar connection with the battery and-with the earthvandmain lines, an alternate positive and negative current is passed from the transmitting to the receiving station.

The connections ot' the springs q q* q q* q" q* with the main battery and-with the earth .and main line areas follows: Avwire,13, cx-

tends from one 'ot' the springs'q* to the nega-- tive-pole N ofthe main battery, and another,

wire, 14, connects the other spring, q, with the switch 4S', and through it with the positive pole P( of the main battery. l The springs q qt* connect .by the wire l() withthe main-line stud o, and a wire, 15, connects the springs g q* V w1th.the"eart hline stud s From this expla-l nation it will be seen when 4the springs q' q* i x are in metallic contact with the division-wheel a negative current will pass through the wire 13, spring 9*, division-wheeLG, spring wire 10, and.mainline stud o', and back through the earth-line stud s', wire 15, spring q', division-wheel G', spring g, and wire 14, to the positive-'pole of the battery. The springs fg" qm* are in metallic contact with the divisionf wheel. lA positive current passes from the pole 1).', through the wire 14, spring q, divisiou wheel G', spring q", wire 10, andstudj tothe main line, and back through tl1e^ earthline springs q"* qt, and wire 173, tothe negative vpole of thefbattery. The duration of these currents depends upon the speed and diameter ot' the division-wheeland upon the number of divisionswhich, as previously stated, amounts yto' twentyleight, equal to the numberoholos'" inthe disk of the punching-instrun1ent.

e .Each revolution of thevdivisdmwwheel, d

of the paper-cylinder produces fourteenpositive and fourteen negative currents, which control the mechanism of thereceiving-instrument. This part ot' my invention is represented in Figs. 5 and 6. It consists, principally, of a set of four intensity-coils, A", and a vibrating horseshoe-magnet, B, which controls the motion ot' a clock-movement. C, and through it that of the type-wheel D, as will be. presentlyv explained. The cores ot' the intensity-coils are not connected, and the connection of their helices with the main line is such that their poles are reversed, bringing a north pole opposite to a south, and vice versa. The horseshoe-magnet is secured to a standard, E, which rises from the platform supporting the entire mechanism, and it is so arranged that it is allowed to vibrate between the poles of the intensity-coils A" without being permitted, however, to come in contact with them. If 1 2 3 4 represent the polesof the intensity-coils and n'! p" the south and north pole oi' the.

horseshoe-magnet, andv the current passing through the coils is of such a nature that the poles 1 and are negative and the poles 3 and 4 positive, the poles n p of the horseshoe-'- magnet will b e attracted by the oppositel poles, 4 and 2, and repulsed by the corresponding poles, 1 and 3, and it' the current through the coils is reversed, so as to make the poles 1 and 2 positive and the poles 3 and 4 negative, the poles n" p" ot the horses oe-magnet will be attracted by the poles 1 and l3 and repulsed by thep'oles 4 and 2. Every change in the nature of the current passing through the coils A produces an oscillationvof the horseshoe magnet, and since the change of the current depends upon lthe division-wheel G' in the transmitting-.instrumen t, as previously described, each revolution of said division-wheel produces-twenty-eight' oscillations ofthe horseshoe magnet.

From-tho horseshoe-magnet extends a horizontal arm, a?, the torked end of which straddles an escapernent-wheel, b2, with fourteen' teeth. One prong of the forka2 is longer than the other, and said fork is so adjusted in relation to the escapement-w'heel that for each oscillation of the. horseshoe-magnet the escapement-wheel is allowed tovrevolve half a tooth,

and consequently twenty-eight oscillations ot" the magnet are required to produce acomplete revolution of the escapemen t-wheel. Said escapement-wheel is" mounted on a sleeve, c2,

which turns loosely on the shaft j"2 of the type-1' wheel D, being connected to it by means ot' a hair-spring, d2, which\extends from it'to an arm, e2, vwhich is' rigidly attached to the shaft f2 ."In order to prevent'the Asthe shaft rotates by the action of the vclock-inov'ement C", the spring isv wound up andthe eseapement-wheel turns whenever the iforku releases its teeth.

hair-spring being.. Vwound up any more than necessary to impart, ,motion tothe escxetpement-wheel, and to .allow thety-ne-wheel to catch upif vfrom some-cause'- its motion should beretarded, a toothed wheel, g2, is employed, which is mounted on a tubular shaft, h2, that has its bearingon a piu extending from the shaft f2, as shown in Fig. 6.

Secured tothe ou ter end of the tubular shaft h2 is a pinion, i2, which gears in a stationary toothed rim or crown-wheeh, thatis'irmly secured to the frame-of the clock-movement C". As the shaftf2 rotates, the pinion i2 is carried round ou the toothed ringj2, aud a revolving motion is imparted to it and'to the wheel g2. The teeth of this wheel come in contact with a stop, k2, which projects from the end of the sleeve c2. As long as the escapeinent-wheel b2 is not permitted to revolve, the shaftf2 rotates until one of'the teeth of the wheel g2 strikes the stop k2, and by this inotion the hair-spring` is wound up suirlcient to impart motion to the vesca-pement-wheel.v As soon as the fork a2 releases the escapementwheel, the sleeve c2 rotates and the stop k2 advances, thus allowing the wheel g2 to make a quarter-revolution. The resistance to be overcome by the fork a2 is only that of the hair spring, which is very weak, and at the same time the full power of the clock-movement is exerted to n turn the type-wheel shaft. The teeth ot' the wheel g2 are so adjusted that for each motion ot' said wheel the type-wheel advances one type or space, and the numbcrot types or characters being equal to that ot the characters on the disk A of' the punching-inachne, it will be readily understood how, by the mechanism above described, the motion of the type-wheel is made to conform to the motion ofthe paper-cylinder, the motion of said type-wheel being governed by the division-- wheel G and the oscillations ofthe horseshoe# magnet B". 'lhe type-wheel D revolves under a'block, F2, which is secured between two arms, G2, extending from a horizontal shaft, H2, which has its bearings in two standards, l2, rising from the platform which' supports the receiving mechanism. g

In front of the printingblock F2 are small rollers i2, which serve to convey the paper, and

after the paper has Vbeen printed it passes oli' to a take-uproller, m2, on which it is wound, together with a secondary strip, as. shown in Fig. 7. The course of these two strips is shown in red lilies in said figure, the main strip being passed in4 from above and the secondary strip from below.

A small roller, n2, provided with a series of line points, is mounted on the end of a spring,

o2, and pressed against the surface ot' the paper on the takeup roller, and, as this roller revolves, the points of the roller n2 pierce the two strips of paper and cause them to adhere together, so that the message printed on the rst strip is covered by the secondarystrip, and cannot be read until the two st'rips are separated. y

- To prevent the stri ps ot' paper becoming separated .when they are taken ofi', I connect the ends bya small quantity of paste. When this is done the strips can be taken olf from the roller endwise in the form of a ring.

The take-up` roller m2 is mounted on a shaft, p2, which carries a drum, (12 from which a weight is suspended to im parato said roller the requisite rotarymotion. This motion is regulated by an esoapement-wheel, J2, which is mounted on the shaft p2, and which is provided with teeth otvsuch a pitch that the paper is fed along the requisite distance after every letter is printed on it. A forked arm, r2, which extends from the armature s2 ot' an electro-magnet, K2, engages with' the teeth of the wheel J2 and arrests the same until the armature of the electro-magnet is attracted. In that case one prong of the fork relieves the tooth with which it had been in contact, andsaid wheel revolves halt a tooth, and when the armature is drawn back again the wheel J2 is set free to revolve half a tooth. It' the armature of the electro-magnet K2 is not attracted, the teeth ot' the wheel J2 press on a dog, t2, which is pivoted toone of the standards I2, as shown in Fig. ot' the drawings, and the back 'of this dog acts on an arm, u2, which extends from the shaft H2 and is subjected tothe action ol-` a Spring, e2. IThis spring has a tendency to draw the printing-block down on'lthe surface of the types; but its poweris overcome by the action of the dog t2, which raises thearm fu2and throws theprinting-block ott' from thetype-wbcel. rlibe type-wheel is thus allowed to. revolve 'reely until that letter which is to be printed arrives under the printing-block. 'At that moment the type-wheel stops a short time, the armature s2 of the electro-magnet K2 is attracted, and the wheel J2 advances halt' a tooth. By this ino- ,tion the dog t2 is released suddenly, and the springt?, acting on the arm u2, causes the printing block to come down with considerable force.

In order to' hold the type-wheel in the correct A.position while the printing-block descends, and

to prevent the same from turning one way or theotherduringtheprintingoperation, awheel,

'm2, is mounted on the `shaftf2 of the type-wheel.

This wheel is provided with triangular teeth,

as shown in Fig. 9, and an arm, y2, by dropping between said. teeth retains the same, together with the type-wheel, in the desired position. The arm y2 is'secured to a rock-shaft, z2, which has its bearings on the pointed ends ot' screws a2 secured in the frame 12, and a dog, b3, extending from said shaft engages with the cogs of the eseapement-wheel J2, being held in contact therewith by a spring, o, as clearly shown iu Fig. 7 ofthe drawings. By the action of the weight d the wheel J2 has a tendency to revolve in the direction of' the arrow marked on it in said figure; butl it is prevented doing so by the fork r2, and when the wheel is held by the fork the dog b2 rests against one of the teeth of said wheel.I and the arm y2 is clear ot the teeth ot the wheel :02; but soon as the fork r2 releases the wheel J2 the dog b2 is forced back in the direction of the arrow marked near it in Fig. 7 ,and the point of theaijm' y2 is'thrown in gear with the-wheel 1v2, causing the saine,

together with the desired position.

The motion of the fork r2, and ofthe printing apparatus which'is controlled bythe electrovmagnet K2, iseffected in the followingr manner:

typewheehto stop in the One end of the helix' of said electro-magnet connects 1y a wire, 16', with onesay, the positive-pole ,P2 of -a local battery, and its other end connects by a ivire17f, with th'e'pivot d3, on which the horseshoe-magnet-B 'oscill'ates, and another wire, 18, extends from thenegative l pole N2 ot' the local battery to the standard E",

which forms the bearings for the pivot d3. Said pivot is insulated by lining the sockets in which it is stepped with ivory or other suitable non-conduetorand the metallic connection y between it and the frame is effected wheneverv the horseshoe-magnet touches one of thescrews e3 which limit its oscillations, these screws being inserted in/toau arm, f3, extending fromthe frame E, as clearly shown in Fig. 6.

By following the wires 16, 17, and 18 it will be seen that the circuit through the helizg of the electro-magnetK2 is closed whenever the horseshoe-magnet comes in contact with one of the screws c3, andas. this magnet oscillates continually by the action of the alternate positive andnegative currents passing from the transmitting-instruments through the helices ,of the electro-'magnets A", the circuit through the helix of the electro-magnet K2 is continually closed and opened.v The oscillations of the .horseshoe-magnet, however, are so rapidthat the electro-magnet K2 has no time to attract its armature s2, which is retained by an adjustablespring, g3. lhc type-wheel D" therefore continues to revolve from one type to the other for every'oscillation of the horsevshoe-magnet, and it is not arrested until the tinues for a littlelonger `than ordinarily, and the horseshoe-1nagnetvreinains in contuct with one of the screw :e3 long enough to allow the electro-magnet K2. to overcome the force of the springg3,andto attract thearmature S. When this takes place thev fork r2 releases the wheel J?, and the printing mechanism is caused to operate. At the same time the motion of the type-wheel is arrested bythe action of the forka2 on the escapement-wh'eel b2' long enough to rallow time for the printing.

c The types h3 are made of a series ofvsharp points, as showninEig'. 10, so that they readily perforate the paper whichis thrusttagainst thembytheactipn of the prin tingblock or the type-wheel maybe made entirely out of steel .and the types produced by engraving.

The connection between the helices of the lelectro-magnets A" and the transmitting-instrument is effected by wires 19 and 20, the

wire 19 being made to connect through the switchS2 with the main line, and the wire 20 through the stud L2 with the earth-line.-

The transmitting-instrument lrepresents the I operator; but by a slight change in the construction thc receiving-instrument can be so arranged that it will record a messagetrans- `mitted by the actionof the hand of an oper-- ator on a key or othersnitable mechanism.

I claim as new and desireto secure by Let-V tersPatentc 1. The alphabet-disk A, in combination with the revolving traversing paper-cylinder D and punch F, constructed and operating substantially as and for'the purpose described.

2. So arranging the perforations in the'paper that each of them, by itspeculiar position in relation to the perforation represen ting the Vstarting-point of the message, and to the preceding and succeeding pcrforations, which position is governed by the' revolving and traversing motion-of the paper-cylinder. or by any other equivalent means, represents a specific letter or sign, substantially as and for the pur poses set forth. 3. The combination of the screw-spindle C' and spring G, withthe revolving metallic cylinder B and perforated paper containing the message to be transmitted, substantially as and for the purpose specie .4 Y

4. The electro-magnet F and stop-pawl k', in combination with the cylinder B', carrying the perforated paper, and with' the spring l', constructed and operatin g substantiallyas and for the purpose set forth. 1

5. The division-wheel G, construct'ed as'described, in combination with springs q q* g' g* q qm, paper-cylinder'B',electro-magnets A", and horseshoe-magnet B", constructed and operating substantially as and for the purpose specied.

6. rlhe combination of the electro-magnets A" and horseshoe-magnet B" with thev clockinovementj of the 'receivinggg-instrument,l constructed and operating substantially as and-- for the purposes herein specified.

7 The forked arm a and escapementfwheel b2, in combination with the oscillating/ horseshoe-magnet B", .type-wheel D, and clockmovement C", constructed and 'operating substantilly as and for the purpose set forth.

.8. The sleeve c2, carrying the escapeinentwheel b2 and hair-spring di, in combination with 'type-wheel shaft f2, wheel 92,V pinion t?, crown-wheel jl, and- .oscillating fork a2,con" structed and opewrating subst ntially as an'd for the purposedescribed.

9. The method substantially'as herein degk i e moss scribed of regulatingthe motion of the type- Whecl by means of n clock-Work and of an escapement-Wheel, to which motion is imparted by a heir-spring, substantially as set forth.

l0. The combination of the sharp-pointed types with the type-wheel D and with the printing mechanism, constructed and operating Isubstantially as and for the lpurpose set 'ort 11. The escapeineut- Wheel J2 and electromagnet K2, in combination with the dog t2,

armuz, spring c2, and printing-block F2, *con-v structed and operating substantially :is and for the purpose set forth. 12. The combination of tht-,oscillatinghorseshoe-magnet B, electro-magnet K2, escapement-Wheel J2, type-wheel D", and printingblock F2, constructed and operating substantially as and for the purpose described.

13. Covering up the strip of paper containing the-message immediately after printing the same, substantially as and for the purpose specied.

14. The roller n2, carrying a. sexies 01 points and applied in combination with the take-up roller m2, substantially as and for the purpose describe i 15. The oscillating shaft c2, carrying the dog b3 and arm y2, in combination with the wheel rc2, escapemcnt-wheel J2, and vtype-wheel D, constructed and operating substantially us and for the purpose set forth.

16. The stop-pnwl k. electro-niugnet F', and

perforated strip of paper containing the mes.-

sage,in combination with the oscillating horseshoe-magnet B", electro-magnet K2, and. printin g mechanism, constructed :ind operating substantially as and for the purpose specified.

. ROBERT BOYLE.

Witnesses i M. M. LIVINGSTON,-

G. L.'ToPLIFF.

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