US309012A - tan choate - Google Patents

Description

4 Sheets-Shet 1.

(No Model.) S. F. VAN GHOATE.

ELECTRIC ARC LAMP. No. 309,012. Patented Dec. 9, 1884.

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4 Sheets Sheet 2.

(No Model.)

s. F. VAN OHOATB.

ELECTRIC ARC LAMP.

Patented Dec. 9. 1884.

INVENTEIFH 8F Va/zC/wate WITNESSES N. PETERS. Phulo-Lllhuyzmphnr, Waahlngtom D. c.

4 Sheets Sheet 3.

S. F.- VAN GHOATE -116 Model.)

ELECTRIC ARC LAMP.

Patented Dec. 9, 1884.

IN\/E NT CIR SI. Van C/ZOOLZE N. PETERS. Pnmo-umn m mr. Vin/Mullen. D. c.

(No Model.) 4 Sheets-Sheet 4.

S.-F. VAN CHOATE.

ELECTRIC ARC LAMP.

Patented Dec. 9, 1884.

Fig/.4

INVENTUH:

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SILVANUS F. VAN GHOATE, OF NEW YORK, N. Y.

ELECTRIC-ARC LAMP.

ZEFEUIFICATIQN forming part of Letters Patent No. 309,012, dated December 9, 1884. Application filed June 24, 1861. (No model.)

T0 at whom, it may concern:

Be it known that I, S. F. VAN OIIOATE, a citizen of the United States, residing at New York, in the countyof New York, and State of NewYork, have invented certain new and useful Improvements in Electric Lamps, of which the following is a specification.

My invention relates to that class of electric lamps known as arc lamps, in which the conducting sticks or pencils are placed end to end, and fed toward one another as they consume.

My invention consists in certain novel devices for feeding both carbons toward one another and for determining the length of are.

My invention consists, further, in certain novel devices for supporting the various parts of the lamp, and for securing a reflecting-hood to the globe surrounding the light,whereby the lamp described in my Patent No. 268,155 is adapted for use with electric-are lights in which the carbons are placed end to end.

My invention finally consists in certain details of construction, which will be specified in the claims.

The features of construction relating to the reflector and the devices for making connection to the lamp are also applicable to incandescent electric lamps, as will readily appear from the annexed description.

In the accompanying drawings, Figure l is an elevation of the lamp. Fig. 2 is a vertical section of the lower part of the lamp, showing the details of construction relating to the regulating and feeding mechanism and the devices for supporting the same and conveying the current to the light. Fig. 3 is a detail section of the upper part of the lamp, showing the construction of the hood and reflector and the means employed for securing the various parts together. Fig. 4 is a detail view illustrating the path of the current through the lamp, and showing, also, a modified arrangement of the electromagnetic devices for con trolling the carbons. Fig. 5 is a bottom view of the casing and supporting devices. Fig. 6 is a top view showing the devices for holding and clamping the lower carbon. Fig. 7 is a vertical section of devices to be employed for making electrical connection between the lamp and the main eonductors. Fig. Sis a section of the lower part of a supporting post or bracket, showing devices that may be employed for cutting off the current when the lamp is lowered in its support or bracket for repair or removal or for the insertion of new carbons. Fig. 9 is a detail "iew of the spring clamp.

Referring to Fig. 2 of the drawings, P represents a hollow supporting-post, upon the top of which an inclosing globe for the light is supported in the manner set forth in my patent above referred to, or in any other suitable manner.

13 is a tube of metal fixed in the upper part of the post and acting as a support and guide for the cylindrical movable case A, of metal, containing the mechanism of the lamp proper.

O is a stirrup or bracket secured to the lower part of the case by means of screws or bolts, (1, while 1) represents the top of a supporting rod or tang depending within the post to a point where it may be reached from a door or opening in the post below. This rod is secured in a cross-piece, b, by means of a nut, c, as shown, and serves to hold the lamp proper in an elevated position or to lower the same to the level of the door or opening in the manner described in my application above named.

E is a hollow cylinder, of wood or other insulating materiahlitting closely within and secured to the metallic tube A. This cylinder serves as a means of attachment and support for the various mechanisms, and also as aninsulation between the various parts. lVithin this cylinder are fixed in any suitable manner two spools, F F the lower one of wood or bone, rubber, or other non-magnetic material, such as brass, and the upper of soft iron, which hold two coils or helices of insulated wire, the upper coil in the circuit with the carbons and acting as the regulating-coil, and the lower in a derived circuit around the carbons. These spools are bored centrally for the passage of the lower carbon and holder. A hollow cylinder, ol'brass or other metal, is fast cued within the lower spool, and is screwed into the lower end of the iron spool, so as to hold the two spools in line and lirmly together. It serves also as a guide for the 1101- low metallic tube within which the lower car bon is supported, and through which it is fed upward by the devices to be presently described.

G- is a circular armature of iron encircling the tube of copper or other nonmagnetic metal and fastened thereto. It is arranged to be attracted by the upper metallic spool ofiron, to whose upper face is secured a piece of felt or other material which serves to prevent the armature from sticking and to deaden the sound or click of the armature when it is brought forcibly down in contact with the head of the spool. The edge of the armature is slightly beveled, for the purpose of imparting movement to devices bearing against the armature at that point, which serve to release and to hold the upper carbon. upward movement of the armature is controlled by an adjustable screw tap or sleeve, H, which incloses the tubef, and is provided upon its exterior with a screw-thread for engagement with a serew-thread upon the interior of a boss or sleeve projecting downward from a cap-plate, 1 The sleeve is provided with a milled head, whereby it may be adjusted Verti :ally. The hollow tube f. which carries the lower carbon, and to which the armature G is attached, is supported by a coiled spring, 7.:, the upper end of which rests against a collar, m, secured to the tube f, while its lower end rests upon adjusting and set nuts jj, by means of which. the degree of compres sion of the spring may be regulated. These nuts are adjustable upon an upright hollow tube, l, which is provided with a screw-thread upon its exterior, and is secured at its lower end to a plate on cross-bar h, (shown in bottom view, Fig. 5,) fastened by screws to the lower end of the insulation-cylinder l5 1*]. Electrical connection with the tube and the lower carbon for the outgoing current is made by means of a metal block, fastened to the lower end of the tube and provided on either side with binding-posts p j) for wires leading from the lower spool, and to the out side conductors. (Sec l igs. 4c and. .3.) The lower carbon, K, is held within the tube by means of a spring, 0:, (seen in Figs. (5 and 9,) secured to the tube at its upper end, which spring is slightly rounded at its bearing end, so as to allow thetube to move up and down whenever the carbon is clamped by de vices to be hereinafter described, but which bears against the carbon with sufficient force to cause the tube and carbon to move together under other conditions. The upper carbon, L, issupported and guided in a tube or holder, J',.t irmly secured to metallic rod 1, bent at its upper extremity and entering a socket or boss in the side of the tube. The rod I is sup ported in the insulatingcylinder l, and is in electrical connection with one end of the helix upon the upper spool of metal. This connection is illustrated diagrammatically in Fig. 4. The rod I, as well as the rod M, which serves also in a measure to support the tube, as will The ran ge of be seen, passes upward within the globe instead of upon the outside thereof, as in electric lamps of the ordinary form, in which the carbons are placed end to end. This not only simplifies the construction, but also gives a more pleasing appearance to the lamp, and when the globe is opalescent or of ground glass does away with the black and well defined shadows which occur where the supports for one of the carbons are placed outside of the globe. The improved result in the latter particular is probably due to the diffusion of the light by the material of the globe itself, and the rodeo tions from one point of the interior surface thereof to another.

The clamp and detent which controls the movement of the upper carbon consists of a rod, 3f, similar to l, which is provided at its end with a chisel-point, '10, forming a clutch or detect, and adapted to engage with the surface of the carbon and hold it from sliding downward. The end it plays freely in the boss or opening in the side of the'tube. The

rod M is supported in an upright lever, N, of

bone, rubber, or other insulating material, which is pivoted in a slot in the insulationcylinder E at the point r, the bracket 3 upon which the lever is pivoted being secured to the cylinderliin themanner shown. A. spring, fastened to cylinder A, bears against the le verand tends to hold the chisel-point it: againstthe upper carbon, while an adjustable screwpin, a, passing through the lever,and adapted to bear with its rounded or beveled point against the beveled edge ot'the armature, serves to withdraw the clutch to when the armature is raised by the action of the supporting-spring 1.. Av sermv-stop, l3, passing through the cylinder A, limits the backward play of the lever. When the chisel point or end of rod M presses against the carbon-rod L, the latter will be firmly held suspended in and against the sides of the hollow tube'or socket J, notwithstanding the lower carbon, K, may be lowered or entirely removed; but when the lower carbon IIO is separated from the upper, on moving rod M to the right the slightest degree, the carbon .li would instantly fall by gravity until the lower end was arrested by the lower carbon, or until the rod 1i again pressed its point \Y against the side of the carbon. The contact and press urc against the carbon and the removal of said pressure and contact is brought about by the armature (ton the one hand and by the spring t on the other. The dummy spool ll, of wood, bone, or rubber, and the soft-iron spool F, as I have already rcn1arl ed,are wonn d with a few layers of eomlucting-wirc, the wire on the iron spool being, preferably, a little coarser than that on the lower or dunnny spool, so that the resistaneein the two, including the carbons and the various connections, may be nearly equal. The circuit around the iron spool should be of a little lcss'resistance than the circuit through the wire on the dummy spool. The connections of the spools or heliees, the carbons, and the other devices are shown in Fig. 4. The current entering at main wire 1 011 arriving at 2 branches. The left-hand wire passes around the iron spool and to arm or red I, carbons L and K, tubef, collar Z, wire 3, and on to the next lamp or to earth, as the case may be. The right-ln'ind wire or circuit passes around the wooden spool and out through wire ate eolla1."/,where itjoins the main line again. As will be seen, the circuit is divided between the two spools and formed into multiple arc, while one branch does not pass through the carbons or are and is never broken, but simply acts as a continuously-closed circuit, to keep the current in the main or general circuit closed and steady during the imperfect contacts or variations of the current on passing through the carbons and the lamp mechanisms. The dunnnyspool and its bobbin may, if desired, be located in other positions. The position shown is chosen tor the sake of convenience and simplicity in construction.

The action of the ironspool magnet, the armature G, and the stop-pin u and rod M with its chisel-point w, is as follows: In the normal state of the lamp, and when no current is acting on the iron core of the magnet, the spiral spring 7.: raises the tube], armature G, and carbon K until the armature comes against the hollow adjusting-nut H. In its upward movement the beveled edge of the armature acts upon adjustable pin 11, thus with drawing chisel-pointw of rod M from contactprcssure against carbon L, when the latter drops down upon the point of carbon K; This is the position of the various parts named when the electric current is turned through the circuit. The instant this is done the two carbons begin to burn at their contact-points. but the are does not and cannot form until the two points of the carbons in contact are slightly separated. This separation is also instantly brought about by the current causing the sot'tiron spool to attract the armature G, which pulls down thctubef and carbon K. This movcmentthat is,'the downward move ment of the armature G brings its beveled edge away from the screw-point a and allows the chisel-edge ot' arm M to engage and hold fast the upper carbon and prevent it from following the downward movement of the lower carbon. The pin a may be so adjusted that this result will be produced on the slight est movement of the armature G. The separation of the two points of the carbons a certain distance forms an arc of a certain kind and gives a certain tension or strength in the current. The spring 7; is adjusted to this con tain tension or current strength, and so regulates the armatureG that is to say, this cer tain tension or strength of current holds down the armature against the set strength of the spiral spring 7., but it the current strength should be weakened, which it would if the are or the space between the carbon-points should be increased, the spring It: lifts or raises the tube f and armature G, and thus pressing back th arm or rod M allows or causes the upper carbon to be in to drop and so meet or approach the ascending or rising carbon,when the are or space between the carbon-points is decreased and the current is consequently increased, and so causes the armature and lower 0; rbon to descend, and again the are is regulated to the set or required strength of the current. This operation is repeated as often and as regularly as the variation in the dis tance between the points oi the carbons takes place.

I have shown how the upper carbon, L, is regulated, and how the lower carbon and its carrying-tube f is raised and lowered together; but now I will explain how thelower carbon. ii, is moved within thetubc,and also describe the devices employed for positively locking the lower carbon at a determinate point in its downward movement with the armature, so as to prevent the formation of an arc of abnormal length and at the same time to allow the armature to continue its downward movement without the carbon. The top of the tube has out upon its outside surt'acea fine screw-thread, upon which nut a may be made to move up and down by turning it between the thumb and linger by its outer milled surface. The upper edge of this nut is beveled.

On each side of the tube f and nut a are two upright spring hooks or clutches o o, mounted upon the top plate, g, of case A A. On the inner sides of these clutch-hooks are two beveled surtaces, so arranged as to be acted upon by the beveled end of nut 11 when the latter is raised by the tubcf. The two spring hooks or clutches o 0 are so arranged as to press it rmly against the opposite sides of the carbon K, and by their beveled or chiseled edges or points hold the carbon firmly and prevent it from moving downward; but it will be seen that owing to the peculiar bevel of their points the carbon could be moved upward notwithstanding the pressure 01' the hooks against its sides.

It is obvious that the end of the tube might serve the t'unction ot' the nut if it were bevcded at its end; but as it is dilticult to make said tube of precisely the proper length, I employ the adjustable nu t, which serves the prac tical purpose. oi adjustably shortening and lengthening the tube. The nut n can be so set that on the upward movement of the tube f the bevel oi" the nut and that on the two hooks causes the latter to spread out and release their contact with the carbon; but on the tube f and nut a being moved downward the hooks are again brought into contact with the ear bo'n, thus holding it tirmly.

At the top of tube located, as before explained, a tlat spring, a", with a rounded or bent end iirmly fixed to and in a slot formed at the top of tubef and pressing firmly with its rounded end against the carbon K, thus justing screw-pin '21, Fig. 2, is set so that on holding the latter firmly in the tube. The carbon can, however, bemoved up and down notwithstanding the pressure of the spring.

Fig. 6 is a plan of the spring-hooks, &c., looking downward upon thetop of case A A. The-two rods M and I and the carbon ii are shown in section. The two spring-clutches on hooks are shown at 0 0, while 7"indieates the tube carrying the carbon, and m the upper end of the spring which presses against and holds the carbon in the tube. The adlowering the armature G the chiseled point a: of the rod M is brought against the carbon L, so as to hold the latter firmly before the two spring-clutches 0 0 come into contact with the lower carbon, so that the descent of the upper carbon is arrested before the lower one begins to be separated from it. The beveled nut is so adjusted that the spring hooks or clamps o 0 do not clamp the carbon after the upper carbon ceases its downward movement until the space between the two points of the carbons is sufficient for the proper development of the voltaic are, when the balance of the downward movement of the armature causes the spring a: to slide on the side-of the carbon and take a lower position along the side thereof. When the tubefand springm are raised again by the action of the spring 7;, the carbon, bei ing tree to move in an upward direction between the clutches 0 o, is lifted. By this ditt'erential motion between the tube f and the carbon K the upper end of the latter is raised as it is consumed by the voltaie are. This movement is repeated whenever the armature is carried below the point where the nut a releases the clutches and allows them to engage with the carbon so as to stop it in its down ward movement.

Other forms of clutch may be substituted for that shown, and other devices moving with the armature and carbon-carrier may be our ployed forcausing the clutches to engage and disengage the carbon.

A modification of my invention, in which an armature is made to take the place of the spring 7; and its adjuncts i'or raising the carbon and tube f, is shown in Fig. In this case the lower spool is made of soft iron, like the upper spool, and an armature, G, similar to G, is firmly fixed to the tubcf at a proper point below the spool. When the are be comes abnormal, the lower spool becomcs supcrcharged and raises the armature G and the tube f in the same way the spring 7;. The lower spool, F, is separated from the up per spool by a plate of non-magnetic material, 21, or, if desired, the two spools may be separated to a sutlicicnt distance to prevent the one from affecting the other. it will be seen that this construction consists simply of two spools arranged end to end, and abuting against each other, or approximately so, and having ahollow tube or arod passing axially through them, upon each end of which is socured an armature, the said armature being I operated conversely by the main current passing ovcr the main line. This feature of my invention is not limited to a carrier of any particular construction, butniay be employed with carriers of other terms besides that: shown.

In order to do away with ilexible conducting-wires passing down within the post from the mechanism ot' the vertically-moving casing and allow the casing to beraiscd and lowered more conveniently, I have adopted the arrangement shown in Fig. 7, which is a vertical section of the cast-iron post 1, the casing A, and insulatingtube 19, carrying the lamp proper.

Two strips oi copper are represented by 23, while 2t indicates insulation betweecn said copper strips and the cast-iron post. These strips of copper and their insulation are held by screws 25, passing through insulating-plugs 26, which may be held in place by applying cement; at the blank spaces indicated at 27.. The copper strips are connected to the two wire terminals ot" the main circuit. Two stout 'tlat metallic springs, secured at their upper ends by bolts 25), passing through the tube of insulating material .l, connect with wires 1 andS by the aid of screwaiuts :30. When the case is raised up to its properseat, the springs 28 press upon the Hat surl'aee ot' the copper strips 23, and, making good contact, keep the circuit closed. The wires 1 and pass up through the coils and lamp, and so complete the circuit in that direction alter the manner indicated in Fig. 4-. The plates 23 may be continued down within the post to connect with underground wires, or they may be connected with aerial conductors brought to the top of the post. In the latter case they need only be long enough to make metallic contact for the springs when the lamp is elevated.

8 is a sectional view of a portion of the cast-iron post opposite the door in the side of said post where the attendant brings down the lamp for adjustment and renewal of the carbons or other burners.

Gontinuations of the two copper strips mentioned and shown in Fig. 7 are indicated at 2:}. A tlat plate of brass, 31, forming a switch lever i'ulcrumed or pivoted at and carrying a knob, handle, or thumb-piece of insulating material, 3 1., by which the lover or switch is operatet'l, is for the purpose of cutting oit' or shunting the circuit from the lamp above while the attendant is adjusting it or removing the carbons. Upon opening the door in the post the switch is turned across the copper strips, so that the current will take the direction of the arrows. The lamp can then be lowered and adjusted, &c., and raised again without the least danger from the electric current. \Vhen the lamp replaced in its proper position, the switch-lever is turned downward and parallel with the copper strips, when the electric current can then llow through the lamp.

in my previous patent No. 268,155 the re IOU llcctor and hood on the top of the glass globe was partly fastened by a rod terminating in its lower end in a flat head, and at its top in a screw-thread and nut to bind and hold the hood and reflector firmly to the top of the globe; but in my present invention the lower part of the rod terminates in a hollow tube, 7, Figs. 2 and 3, trunipetshaped or flanged out at its lower end, as shown in the drawings, the projection or flange of the tube extending underneath the edge of the hollow in the glass or other globe, as at 8, while the space 9 between the projecting rim of the globe and the tube, as well as that shown at 13, is filled in with cement or other binding material. The tube and hood or reflector of thelamp are also further supported and strengthened by a plate of metal or other material, marked 45, which is firmly secured to the sides of the tube and reflector or hood by soldering or otherwise, as shown at 41 andet2. The upper end of tube 7 terminates with a rod and screw-nut, 6, the connection of the rod and tube at ll being made by soldering or in any desirable manner. The joint and connection of the apex of the hood and the tube at 15 is also soldered or otherwise fastened. The tube 7 furnishes a space for the upper carbon to extend upward above the top of the globe, and the funnelshaped mouth guides the end of the carbon on raising the case so that should the end of the carbon not be in exact line of the hollow of the tube it would be directed and guided to a central position.

The rod and screw-nut may be dispensed with, and the ornamental finish or top'of the hood could be soldered at 17; but therod and screw-nut strengthen the parts and prevent extension from corrosion or loosening of the soldering of the joints of thehood between its upper and lower apexes.

hat I claim as my invention is- 1. The combination, with a hollow carboncarrier, of a clamp attached thereto for sup porting the carbon and adapted to slide upon the carbon when the latter is locked against movement, a clutch or detent .for the carbon adapted to hold it stationary, and devices supported by the carbon-carrier which act upon said clutch and cause it to engage with and disengage the carbon as the carrier is moved, substantially as and for the purpose described.

2. The combination, with a hollow carbon carrier or support, a clamping or supporting device attached to and moving with said carrier and adapted to bear against the carbon and to hold or propel or to move upon the carbon when the same is locked against movement, a locking-clutch fixed upon a sta tionary support and arranged to normally rest against the carbon and lock it against movement with its carrier, and a disengaging device attached to the carrier and acting upon the clutch to disengage it from the carbon,

substantially as described.

3. The combination, with a hollow carbon carrier or support, of a spring or l'riction clamp attached to said carrier and bearing against the carbon for holding it in its tube, a lockingclamp bearing also against the carbon and adapted to lock it from movement in one direction only, and means attached to the carrier and acting upon the locking-clutch to disengage it from the carbon.

4-. The combination of a hollow carbon-carrier, a spring-clamp carried thereby and bearing against the carbon or carbon-rod, a springlocking clutch adapted to prevent movement of the carbon in one direction and to allow free movement in the other, and devices attached to the carbon-carrier arranged to release said clutch so that it may engage with the carbon and adjustable upon their support so as to determine the point at which in the movement of the carrier the carbon will be locked against further movement.

5. The combination of a hollow carbon-can rier and a spring-locking clutch attached to a stationary support and adapted to engage with the carbon, and an adjustable block or lug upon the carrier which impinges against the clutch as the carbon is moved up and down and removes the clutch from its locking position or allows it to lock the carbon, substantially as described.

(3. The combination of a hollow carboncarrier, an electro magnet for moving the same, a spring locking-clutch attached to a stationary support and adapted to engage with the carbon and hold it from movement with its carrier in one direction, but to permit free movement in theother, and an adjustable nut upon the carrier that is brought into and out of contactwith the clutch as the carrier moves up and down and thereby throws the clutch out of engagement with the carbon or allows it to engage therewith.

7. The combination, with the hollow carbon-carrier, of the adjustable nut encircling the carrier, and beveled upon its edge, which edge engages with the clutch and serves as a means of shortening and lengthening said carrier.

8. The combination of the hollow carboncarrier f, provided wit-h its clamping-spring w, theupright clutches 0 0, beveled at their sides, and the adjustable nutn, beveled at one edge.

9. The combination of the hollow carboncarrier, the armature G, secured thereto, the clamping-spring .r, clutches 0 0, and adjust able nut 01, substantially as described.

10. The combination of hollow carbon-carrier f, armature G, attached thereto, and ad justable hollow setscrew H, substantially as described.

11. The combination of the upper carbon in an electric lamp, a detent or clutch supported by a lever, and an armature beveled at its edge and attached to the carrier of the lower carbon, substantially as described.

12. In combination with the lower-carbon carrier of an electric lamp, a spring or sliding clamp connected to the carboacarrier, aeluteh adapted to engage with the carbon and prevent its movement in one direction, but to allow free movement in the other, means at tached to the carrier for removing said clutch :t'rom engagement with the lower carbon, an armature attached to said carrier acted upon by a governing eleetroanagnet, a detent for the upper carbon, and intermediate operating devices between the detent and the armature ot' the lower-carbon carrier, substantially as described.

13. The combination of the hollow carrier for the lower carbon, the armature attached directly thereto and beveled at its edge, the upright pivoted lever and detent for the up per carbon, and the adjustable bearing-pin passing through the lever and adapted to err gage with the beveled edge of the armature.

14-. "he combination, substantially z describcd,of ahollow carbon-carrier olnoirmag netic material, an armature attached directly thereto, and a spool of iron wound with aregulating coil or helix ot' insulated wire, and provided with a central bore or passage for supporting and guiding the carrier.

15. In an electric lamp, the verticall, ,'-movable casing supporting the working parts of the lamp and carrying a hollow or tubular holder of insulating material, within which is titted the lampanagnet, consisting oi" the spool of iron wound with insulating-wire, as and for the purpose described.

10. The combimition, substantially as described, ot' a tubular holder, E E, and the ver tically-arranged spools l if, having one or more enlarged or llanged heads of iron wound with coils of insulated wire in the main or principal circuit with the light and in a derived circuit thereto.

17. The combination, substantially as described, ot' the tubular carrier 19, a centrallybored spool having an enlarged or flanged head of iron, a carbon or earboircarrier passing through said spool, and an armature attached to the carbon-carrier and arranged within the magnetic held of the ironspool head.

18. The combination, with a carbon carrier or support of non-magnetic material, of two centrally-bored spools arranged in line, having enlarged or flanged heads and wound with coils of wire in the direct circuit with the light and in aderived circuit thereto, and an armature-plate attached to said carrier and arranged within the magnetic field of one of the spool-heads, substantially as described.

19. The combination of casing 19, spools F 1*, earbon-carrier 1, and cross-piece h, sup porting the spring upon which the carrier rests.

20. The combination of casing 15, hollow spools 1 F earrierf, cross-piece l1, screwthreaded tube i, adjusting-nuts J, and spiral spring 7.:, substantially as described.

21. The combination of the insulating-casing E, spools F 1", provided with a central passage for the carbon-carrier, armature G, attached to said carrier, verticatty-pivoted lever X, mounted within a slot in the cylinder E, and devices carried by said lever for con trolling the movement of the upper carbon.

22-. The combination, with the interior 0011- duetors leading to the lamp, of the means for exterior connections substantially as described, consisting of the insulating-plugs 26 and screws 25, passing through openings in the wall of the post.

23. The combination, substantially as described, 01' the vertically-movable lamp, the hollow post, the insulated eondacting-strips, and the shunting-switch 31, located as described.

24. The combination, with. the vertically movable lamp, the inclosingpost, conducting plates or metallic contacts attached to the interior ot' the post and connected to the outside circuit, and. eondueting-springs attached to the lamp and adapted to bear upon the conduct ing-plates when the lamp is elevated to a position tor use.

SILVANUS l1. VAN OHOATE.

Witnesses- H. C. TOWNSEND, 1I.-\RRY DEARBORX.

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