US1191023A - Apparatus for displaying advertisements, signaling, and the like. - Google Patents

Description

J. P. NAYLOR. APPARATUS FOR DISPLAHNG ADVERHSEMENTS, SIGNALING, AND THE LIKE. APPLICATION FILED AUG.2. [9H1 1,1 91,023. Patented July 11, 1916.

1 J; 2 SHEETS-SHET I. 13 ,9; 7.

1. P NAYLOR. a ADVERTJSEM ENTS, SIGNALING, AND THE HKE APPARATUS FOR DFSPLAYHJ APPLICATION FILED AUG,Z. 19H

Patented July 11, 1916.

2 SHEET5SHEET 2.

JAMES PBIESTNQLL NAYLOB, OF DUL'WICH, LONiJON, ENGLAND.

APPARATUS FOR DISPLAYING ADVERTISEMENTS, SIGNALING, AND THE LIKE.

Specification of Letters Eatent.

Patented uly 11,1916.

Application filed August 2, 1811. Serial No. 642,030.

To (in whom it may concern:

Be it known that I, JAMES PRms'rNALL NAYLOR, a subject of the King of England, residing atDulwich, London, in England, have invented a certain new and useful Improvement in Apparatus for Displaying Advertisements, Signaling, and the like, of which the following is a specification.

This invention relates to apparatus for displaying advertisements, signaling or the like, or communicating messages by day and by night whereby letters or characters, de-

' vices or designsare displayed or caused to appear by day due to the display of a plurality of members dissimilar-1y colored from the supporting background, and selectively exposed so as to build up or form any -desired character or letter, and by night or during darkness the letters or characters may be rendered visible due to artificial light being projected upon the surface of the sign, or by means of lamps individual a to each display section or element being illuminated or extinguished in synchronism with the display or non-display of the visual member the light from each ,Iamp being confined to and used for the illumination of the surface of such member. Alternative means may also be"utilized whereby lamps are used to define the relative position of the visual member without illuminating its whole surface whereby the display characters are brilliantly outlinedwith lamps giving the. appearance common to electric light signs. For the purpose of simplifying my description, I shall herein use the term.:-Dav to denote that the sign is situated or constructed for use with light out the daylight visual member. Multicolor element, an element capable of dis playing more than one color. Luminous visual member, the lamp utilized for illuminating or defining the visual member by night or in darkness. Visual member, the disk or flap visible by day with light projected upon its surface. Monogram to denote a support or background constructed to retain a plurality of elements which may be displayed in such formation that the suc cessive display of dissimilar group of elemcnts will form or define two or more characters. Sign to denote an assemblage of monograms or display members together with their supporting background and controlling means. Clearing to denote the action or returning all' elements to their n0ndisplay position. Oleared to denote a sign with all its elements in the nondisplay position.

One object of my invention is to construct elements with their visual members together with individual operating mechanism and means for illuminating and extinguishing their individual lamps as a self-contained unit or element. and in order to facilitate the manipulation of such elements when applying them to or inserting them into the monogram or other suitable supports each element is provided with electrical contacting means so that with a group of such simi- 8 lar elements they may be readily assembled, replaced or interchanged.

Another object is to construct elements whereby color changin effects may be produced by day due to the provision of and successive exposure of a plurality of dissimilar-iv colored visual members, and means whereby such effects maybe produced by night are firstly obtained by providing a clear lamp with a reflector to confine its light to the colored visual members and to screen the white lightfrom the eye of the observer. and secondly. by providing a group of lamps preferably colored to match the visual members, and means whereby each lamp may be illuminated or extinguished in synchronism ,with the exposure of the dissimilarvisual members.

Further means are also disclosed whereby the dissimilarly colored visual members may be exposed successively due to the step of support for a plurality of preferably similar sized elements, such support consisting of or forming a background provided with perforations Or cells combined with electrical connectors so that when the elements are inserted into such cells or per forations their correct electrical connection is facilitated or automatically made by the plied ,to

action of inserting them, thus simplifying the removal and replacement of elements which might become necessary in the case, for example, of it being desirable to rectify a fault, and in order that all letters or the alphabet and numerals O to 9 may be displayed in legible and conventional form from a comparatively small number of Similar sized and shaped Visual members I have designed a special formation of monogram,

A further object is to provide the elements with locking or retaining means so as to hold the visual member in the display and non-display position and I describe and illustrate two methods whereby this may be done, first Where a, spring normally operates to retain the element in the non-display position, the excitation of the electromagnet causing the element to display also and to retain it in the display position during the continuance of its excitation, thus the spring provides retaining means to hold the element in one position, and the magnet acts not only the motive power to cause dis-- play. but after display retains the visual member in the display position. T hisltype of element therefore, consumes energy in its magnetic operating device during the period of display, and is suitable for controlling in groups by known methods previously ap the control of electric lamps in groups.

I have also devised elements whose visual members or contacts are held in both the display and non-display position without consuming energy. In each of these elements the visual member is normally brought to and held in the display position by means of a "spring or gravity or a spring and gravity combined and is held in the nondisplay position by means of a lock or catch so that no current is consumed during the eriod of display or non-display, the said isuai member being returned by electromagnetic means to the non-display posi tioniagainst the tension of the spring that causes .the displa of the visual member where it is held by a lock or catch; can

rent being only consumed during the citation of the magnetic means for releasing the catch, and during the period of excitation necessary for returning the visual mom; her to the catch against the spring or gravity tension. These elements are, therefore, constructed with two magnetic functions, one to cause display and the other to cause nonmlisplay. I am aware that means have been devised whereby two separate magnets have been utilized to operate a visual member. one to bring the element into the display position, and the other to bring it into the non-display position, but my reason for de ising the novel means of operating one type of element which I disclose herein is that the elements may be displayed by utilizing an electric current of small power and short duration due to the fact that display is caused by the action of a spring under tension which has only to be released by the display impulse, thus rendering them particularly suitable for a system of control described in my divisional specification Serial No. 789930, (division of this application) wherein means are described for controlling a plurality of similar monograms from a single composing keyboard which by the actionof manually or automatically operable selector switches places each monogram successively or selectively in relation to the composing keyboard so that any character determined by such composing device may be produced. displayed, or deli'neated upon the monogram that may be determined by the selector switches so that the ability 190 of the elements to respond to an application of energy small in amount and of short duration is of importance as it allows a controller of the type described in the said specification to rapidly set or display a. plu- 105 rality of dissimilar letters upon a plurality of l'nonograms and due to the small amount of energy required. and it enables the contacting device upon such controller to be of the smallest possible dimensions. The spe- 110 cial means of control disclosed in such divisional specification also describes means whereby groups of elements forming each monogram may be collectively or individually energized so that the whole sign may 1'15 be simultaneously cleared of displayed letters or characters. or an individual monogram may be selectively cleared, but it will be understood that although my elements require application of energy of greater amount and longer duration in order to bring them into the non-display position. yet my method of connecting all the clearing or non-displaying coils to one circuit enables a plurality of monograms to be cleared in the period that it would take to clear one element.

As I have already stated. I combine an electric switch upon each element for the purpose of controlling the supply of elec- 1-30 l 'ters A,

' being constructed so that by interrupting the circuit by'means of the said master switch before the individual element switches are opened "an making the circuit after the individual switches are closed the local element switches do not make and break their circuits with electricity flow' g thus relieving their contacts of liability burn or be damaged, the more substantial master switch to take all the wear and This division of circuits tear of this duty.

lighting circuits and therefore enables the the two control circuits to be operated if desired upon three separate circuits of varying voltage. As signs of the type that I describe herein are principally used in outdoor positions the desirabilit of looking or otherwise securely holding t e visual members in the display or non-display position so as to prevent the disturbance by Wind will be apparent.

I have introduced this short description of my method of control and the uses to which I may put my signs composed of assemblage of elements as described herein in order that the objects of my invention may be better understood.

With the above object in view, my in- "vention consists in the combination and arrangement of the parts as will hereinafter be fully described and claimed.

The annexed drawings illustrate exaIf ples of construction of my invention, in which- Figures 1, 2, 3, 4 are perspective views illustrating various embodiments of elements. Fig. 2" is a perspective view of a displayed visual member of Figs. 2 and 4. Fig. 5 is an enlarged scale non-display position.

of a flap element in the Fig. 5 is a front view of the same in the display position. Fig. 6 is a section on an enlarged scale of an element for the production of differently colored characters, Fig. .6 a front view of Fig. 6. Fig. 7 is a diagram showing the internal electrical connections of an individual single color member, rovided with a lamp. Fig. 8 is a diagram isplaying the monogrammic arrangement of the elements. Fig. 9 illustrates the appearance of the let- B, C, formed by operating the necessary members.

I will now proceed to describe in detail the method of constructing the various forms of elements all of which have common characteristics that each element comprises or may comprisethe disk or flap or the like member for daylight display, mecha diagrammatic side elevation onanism operating said member, and a lamp for night display together with means-for its individual'control embodied an a self contained device capable of being; inserted in or attached to the support or,,m1ved therefrom as a whole, and provided with means to facilitate its correct electrical connection to the operating circuits.

Figure 1 represents an ele ent possessing or capable of the previously described characteristics but operating a. rotating visual member. The member A is supported by two pivots B and 13*, the pivot B carrying a pinion C. The member is supported so as to'be rotatable in its supporting frame about the two pivots B, B asuitable stop, such as the projection D engaging with the aperture of or in the sup orting monogram (not shown) said stop being provided to prevent the member rotating through a greater angle than 180. The frame E carries a lever with a rack F at one end and an iron armature G at the other end. An electromagnet H is mounted in such position as to attract the iron armature Gr toward it when the magnet H is sufiiciently energized. 'It will be seen that the magnet and frame are mounted behind the memher which it is intended to operate, in such Inanner that the pinion C gears with the ack F so that when the magnet H draws the. armature G toward it, it will cause the in the tension on the sprin 12 and malntaming it in this state until -t e coil H is deenergized. When the electric current is ins terrupted, the attraction of the electro-magnet H for G: will cease and spring I will return the visual member to its first osition ..preferably with its side outward co ored to match the screen or frame.

Fig. 2 illustrates an element working upon the same principle as F ig. 1, but with the visual member adapted to work in a slot so that the mechanism and display members occupy very little space when the said display members are returned to-the position within the element as shown, which I prefor to utilize as the non-display position, the front of the element or the monogram is then provided with a slot of sufficient size to permit the egress of the visual member. It will also anism can be confined to very narrow dimensions. The visual member A, 1?) shown displayed by Fig. 2, is then formed of two portions ,of suitable shape hinged down; their center C, the surfaces A B being colored or rendered dissimilar to the ground When the coil of the electro-magnet E.

be seen that the operating mech- Y is energized it attracts the armature F which is attached by means of a rod G to the hinge D and causes the folded member to be projected through an aperture formed in the element or monogram face where upon the spring D will open it like a book and thus cause display of the visual member upon the front or surface of the monogram or other support. When in this position the springs 2 are brought under teneion and after the coil E is deenergized these springs will draw the visual member through its aperture causing it to close (against the tension of the springs D) bookwise with its faces A" and B together and causing the visual member to assume its original non-display position with its edges only exposed which are preferably colored similar to the ground or screen.

Fig. 3 illustrates an element similar to Fig. 1, but provided with an additional magnetic system for causing the visual member to be locked in the non-display position, the coloration of the display member being reversed so that the spring 13 tends to always display the visual member. The movement operates in the. following manner. The member A is brought to its normal or nondisplay position by brief energization of the magnet H, the current being of sufiicient duration to allow the magnet H to rotate the visual member A by means of a rack F engaging with the pinion C on the member B and at the same time bringing the spring I under tension or increased tension. When the visual memberhas been rotated through a half revolution the armature Gr engages with the catch K so that when the attraction of the magnet H ceases, the armature G and the rack F are detained against the tension of the spring I consequently the visual member is held in the non-display position. To display the visual member a momentary current of electricity is caused to energize the electromagnet L which then lifts the catch K and allows the visual member to rotate due to the tension of the spring I and to operate through the armature G and rack F. and pinion C, thus causing the member A to rotate and display its side of different color to its monogram or supporting background.

Fig. 4 illustrates an element similar to Fig. 2, but provided with similar magnetic actuating means to that illustrated by Fig. 3, the action also being similar, the members A. B being brought to their non-display position by suflicient energization of the electroinagmetE which by attracting the core G, will bring the attached visual member into the non-display position against the tension of the springs H. hen the visual member has been drawn into the non-display position the frame 1 is engaged by the spring catch K so that when the magnet E is det nergized the display members are held in the non-display position by the catch K against the tension of springs H.

Brief excitation of the electro-magnet L causes the catch K to release and allows the display members A and B to be projected through the screen into the display position as illustrated by Fig. 2, by means of the springs H Figs. 5 and 5 illustrate the construction of an element provided with a single shut ter by means of which the visual member is caused to assume the display and non-display position by means of its individual actuating mechanism. A represents the face of the sign, monogram or background, B a semicircular flap or visual member at tached thereto by means of its hinge C one side of such visual member or flap being colored, or treated to match the surface of the face A of the monogram, and the other side so as to be readily visible when exposed upon the said face A. The section inclosed within the semicircle D is also colored to match the side of the flap which is dissimilar to the monogram face A so that when the surfaces 13*, D, are exposed a visual member of circular shape and colored dissimilar to the surface A is displayed, and when the semicircular section B is brought so that it covers the surface-D the said visual member is caused to disappear. A spring catch E is provided to retain the flap B in its normal or non-display position, the catch E being so attached to its extension E that when the electro-magnet F is energized the extension E travels to ward such magnet thus raising the catch E and releasing the flap. permitting it to rotate on its hinge C due to the tension of the spring K acting through cord K and thus causing the visual member to appear. I

A lamp I provides for luminous display by night when the visual member is oper-- ated into the display position; the cord K or other convenient moving member is con-- nected with a circuit closing device so that a circuit feeding the lamp H is made and broken in svnchronism with the movement of the display member thus actuating the lamp circuit, the circuit being illustrated diagrammatically by Fig. 7 and explained hereinafter. To replace the semicircular flap in its normal or non-display position. tension might otherwise sion and allows cord K to frictionally rotate pulley J. In this position the circuit feeding the illuminating device is operated to extinguish such lamp, by the cord K also being attached to a switch Z so that it ceases to engage a contact Z when the element is in non-display position, a reverse action taking place when the element is displayed. When the energization of magnet H ceases and the flap B is retained by catch E the friction exerted between the V-shaped periphery of pulley J and cord K will prevent the sprin K from drawing the armature X out of its normal position of rest. It will be noticed that when the flap is in the non-display osition it is caused to inclose the lamp an -it-w' also be seen that the lamp orluminous central surface is of smaller diameter than the visual member and is inset in the surface of such member thus preventing lateral distribution of light. This feature causes the lettering formed by night to have a clear sharp definition, and prevents the illummationof other attachments or arts that are located upon the monogram ront A which be rendered visible thereby. Multicolor elements are constructed in a similar manner to Fig. S by providing additional flaps closing one upon the other like the pages of a book; this form is illustrated in Figs. 6 and 6. The example shown is designed to give three changes, for example, white, red and green, and is therefore provided with a spring so that when it is freed from the catch 109 it will take up a position remote therefrom. The

retaining hook is so constructed that: when it is actuated it will only release one flap at a time it being necessary to energize the magnet 116 each time it is desired to cause a change of color to occur. This is accomplished by so constructing the catches 119, 109, that when one is lifted by the magnet 116 attracting the armature 117, this action causes the detent 119, (which has its retaining hook slightly in the rear of that of catch 109) to retain the remaining flaps b descending due to the action of the lin 121 attached to the hooked lever 109 at a point between the pivot 118 and the pivot 120, so as to cause the detent 119 to descend behind catch 109 and thus retain any members not required to display, the member that will next display on excitation of the magnet'nfifi being then located in front of the detent 119 and therefore solely retained by catch 109. After the magnet releases 'the hooked lever 109, it descends due to the spring 122 into a position ready to release the next flap the detent 119 being i lifted clear of the next flap so as to be ready to repeat this operation when the magnet reneives the next impulse. In this example, it is assumed that the flap C is colored black upon its face 101, as is also the lower portion of the element front, the monogram front being similarly colored, it will now be understood that when this flap is retained by the catch 109, no visual member is or can be displayed, when it is desired to dislay a white visualmember the lever hook 109 is lifted, the flap C then falls, exposing its white surface 102, and also the white surface 103 of the flap (l thus exposing a white visual member. When it is desired to display a red visual member, the magnet 116 is again energized, and the operation of the hook and detent is re eated, dropping the fiap'd which being co cred red upon its face 104, and the flap e also being colored red upon its face 105, will cause a red disk or visual member to display and by dropping the flap e, a green visualmember or disk is caused to display, due to the flap e being colored green upon its surface 106, and exposinga part of the element body which has a green semicircle tlheliieon, which with the flap forms a green Clearing is effected by the magnet 111 attracting the armature 112 which is pivoted at 113 causing rotation of the pulley 115 by means of the cord 114 against the tension of the spring 110. The pulley, being fixed to the spindle of the flap C, causes it to rise and engage with the retaining catch 109 so that if any of the flaps in addition to the flap C" have been released they must also be replaced by this action.

i The element is illuminated in darkness by t e lamp 123 which is fitted in such position t at its light may fall only upon the colored surface of the visual members; it is provided with a reflector 123 upon its top so as to screen the eye of an observer from its direct rays and to project its light only upon the surface of visual members, the flaps Q, d, e, being cut away to accommodate it. The lamp is illuminated and extinguished due to the contact 124 being made when an element or flap is displayed and the contact is opened when the elements are cleared this being effected by means of a lever 125 attached to the cord 114 and the contact 124, and pivoted at 126.

Fig. 7 is a diagram showing the internal electrical connectipns of a mono-color element as described in connection with Figs. 3, 4 and 5. It is obvious that in the event of no electric lamp .being fitted to these elements the conductors relating thereto will of course not be required, but if the daylight visual member is di ensed with the same electric system may e utilized. The conductor and L are connected to a source of electricity through a separate circuit so that the element lamps may be illuminated or extinguished when these conductors are energized, and such main switch non-display respectively,

sible to .form all the letters of the alphabet and numerals 0 -to 9 and various conventional signs.

Fig. 9 illustrates the letters A, B, C, as displayed from the monogram shown 1n IVhat I claim as my invention and desire to secure by Letters Patent of the United States is 1. In an advertisement and signal display device comprisin a plurality of selfcontained elements, t e,combination of a board having perforations or cells constructed to receive said elements therein, said perforations being of substantially the same size as each element and said elements each comprising movable portions for display and and being individually removable from and replaceable as a whole in the perforations or cells of said board from one side thereof.

2. In an electrically operated advertisement and signal display device the combination of a board having perforations therein and electric contact members adjacent to saidperforations, and a plurality of self-contained dis lay elements comprising movable portions or display and non-display respectively, electrical devices for operating the same and contact members for automatically connecting conductors feeding said electrical devices, severally removable from and replaceable in the perforations of said board, and when in place automatically causing contact with the required electric contact members of said board.

3. In an advertisement and signal display device the combination of a board having perforations-therein, a plurality of self-contained display elements each comprising an electric ,lamp and movable portions for display and non-displa respectively, said elements being several y removable from and replaceable in the perforations of' said board,and electric contacts capable of coop eration on said elements and board respec ti ely.

4. In an advertisement and signal display device the combination of a board havin perforations therein and a plurality of sel contained elements each comprising a movable display member and internal operative mechanism for display and non-display respectively of said member, such mechanism being restricted to an area substantially not greater than the displayed member, and said elements being severally removable from and replaceablcin the perforations of said board.

5. In an advertisement and signal display device the combination of a board having perforations therein, a plurality of self-contained display elements each comprising an electric'lamp and controllable devices for the said elements beinginitiating display and non-display respectively, said elements being severally remov-- able from and replaceable in the perforations of said board, and coiiperative electric contacts connectible with the said elements and board respectively. v

6. In an advertisement and signal display device, the combination of a base having a perforation, a self-contained element adapted for insertion in and removal from said 5 perforation, such element including an electric lam a switch for said lamp and two I indepen ent magnetic systems for operating the switch into dlfi'erentpositions whereby said lamp is illuminated or extinguished 30 bination of a background of a uniform colofi: 35

adetachable element having a movable plate arranged to be exposed and to display a color difl'erent than said.back-ground,means for holding said-plate in an unexposed po-' sition, means for exposing said plate, means 00 for restoring said plate to the unexposed position, and means for illuminating said exposed plate at night. 1

8. In an apparatus for-displaying adver aling and the like, the combi tisements, si a nation of a ack-ground havin a uniform color, an element having movab e plates arranged to be exposed selectively, means securely holding said plates in an unexposed position, means for releasing and exposing the plates one at a time, means for retaining said lates 1n the exposed position, the release plate displaying a color different than the back-ground, a followin released and exposed plate displayinga co or diflerent than the preceding exposed plate or plates and also different than the background, a lamp for illuminating an exposed late, means for closing an electric circuit on said exposed plate, and means for opening said circuit andrestoringsaid plate or plates tothe unexposed position.

9. In an apparatus for displayin hrough saidlamp when a plate is exposed, 1 a reflector on said lamp to reflect its light advertlsements, signaling, and the like, t e com? ccssively, the plates of o e element inde pendently of those of another element, means for securely holdinglhe plates in an unexposed position, means for exposingthe plates one at a time and retaining the unreleased plates, the released plate displaying 1 a color different than the background, a following released and exposed plate displaying a color difierent than the preceding plate or plates of the same element and also different than the background, a lamp for illumi-' to light on said exposed plate,

means for actuating a plurality of elements at one time thereby exposing a plate on each actuated element and efi'ectin a predetermined displaLflmeans for opening said lamp circuit and forrestoring said plate or plates to the unexposed position.

10. Ina-n apparatus for displaying advertiseinents, *lsignaling and the like, the combination of a-background, a plurality of elements each having movable plates arranged to be exposed selectively, the plates of one.element ind endently of those of another element lo king means securely holding the plates in an unexposed position, means for releasing and exposing the lates one at a time and retaining the unreieased plates, the released plate displaying a color difl'erent than the background, a following released and exposed plate displaying a color different than the preceding plate or plates vof the same element and also difierent than the background.

.11. An advertising display device comprising in combination a anel having orifices therein, and removab e elements adapted to be inserted in said orifices, the orifices being located relatively to one another to form two curved top and bottom lines, two vertical side lines, a central vertical line, two diagonal lines crossing one another in the center of the verticai line, a horizontal 35 cent-er line bifurcated at each end and four ofi'set corner spaces substantially as de scribed. W

In witness whereof I have signed this specification in the presence of two witnesses.

JAMES PRIESTNALL NAYLOR.

Witnesses:

S. Form, C. P. LIDDON.

, means for-actuating a plurality of elements at one time thereby exposing a plate on each circu'itfand for actuated element and efl'ecting' a predetermined display;

means for opening said-lamp restoring said plate or plates to the unexposed position.

v 10.. man apparatus for displaying ad- .vertisementafllsignaling and the like, the

- of one.element inde another element, lo holding the plates in plates, the diflerent than the background, a following Corrections i Lats Patent i No. 1 1 941 {023.

combination of a-background, a plurality of elements each liaving movable plates arranged to be exposed-selectively, the plates endently of those of king means securely an unexposed position, means for releasing and exposing the lates one-at a time and retaining the unreleased released plate displaying 'a color released and exposed plate displaying a 4 the like,

record of the case in'the Patent Oflice.

, Signed v and sealed said exposed plate,

It isfhr by' wtifiedthat iii letters Patent-Ne. 1,1 91,;02 ra ted Jul Englan'd, foran'impi-ovement in (Apparatus line"1 0 0;;fo,r the word and referenceslet'ter coil H? 25, for the reference-numeral 13 read I;

this 19th day of September, AMDI, 1916.

two diagonal lines crossing One another in the center of the vertical line, a horizontal center line bifurcated at each end and four oflset corner spaces substantially as de;

scribed. [W In witness whereof I have signed this specification in the presence of two witnesses. I JAMES PRIESTNALL NAYLQR. Witnesses: i i

S. FORD, v C. P. LIDDON.

errors-appear in the printed specification requiring correction follows: Page 3', line 99, for the reference-numeral 12' read I; same pagef read magaet'HQ' page dr, line and that the said.- Letters Patent shou1d be readwith these corrections therein that the same mayconform to the I aw. ncLiY, Agt'ingflommiu'iomr ofPqte'nta -1i, Q I 1516 ,uponthe application 0: Jameslriestnall Naylor, of l)ulwich, 7 London for Displaying Advertisements, Sigj i it Corrections In Letters Patent No. 1,191,023,

It. is hereby certified that in Letters Patent No. 1,191,023, granted July -11,

' 1916, upon the application of James Priestnall Naylor, of Dulwich, London,

England, for an improvement in Apparatus for Dispiaying Advertisements, Signhling, elid the like, errors appear in the printed speeifinatiun requiring correctioli as follows: Page 3, line 99, for the reference-numeral 12 read 1; same page, line 100; for the Word and reference-letter coil H read magnet H; page 4, line 25, tor the reference-numeral 13 read 1*; and that, the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ofiiee. A

Signed and 56111811 this 19th day of September, A. 1.11, 1916.

F. W. H. CLAY, Agting Commissioner of Patents.

[sum]

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