US571974A - Electric arc lamp - Google Patents

Description

3 Sheets-Sheet 1.

Patented Nov. 24, 1896.

(No Model.)

G, R. LEAN.

ELECTRIC ARC LAMP.

ma m d A IIII1 Aa `(No Model.) v G R LEAN 3 Sheets-Sheet 2.

ELECTRIC ARC LAMP.

No. 571,974. Patented Nov, 24, 1896.

(No Model.) 3 Sheets-Sheet 3.

G. R. LEAN.

ELECTRIC ARG LAMP.

No. 571,974 Patented NOV, 24, 1896.

wgzsszs l Q UNITED STATES PATENT OEEicE.

GEORGE It. LEAN, OF CLEVELAND, OHIO, ASSIGNOR TO THE JANDUS ELECTRIC COMPANY, OF SAME PLACE.

ELECTPlC-ARC LA P..

SPECIFICATION forming part of Letters Patent No. 571,974, dated November 24, 1896.

Application filed May Z3, 1896. Serial No. 592,787. (No model To (t/ wiz/om, t mfr/y concern:

Be it known that I, GEORGE R. LEAN, a resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in electric-arc lamps, one object of the invention being to provide efficient means whereby to prevent the pounding of the lamps at starting through an excessive flow of current and to steady77 the are when the lamp is burning, in case the voltage should suddenly rise or fall, without the necessity for the use of wasteful resistance in series with the lamp, which resistance as heretofore used in lamps in multiple-arc circuits has absorbed from twenty-five to forty per cent. of the energy.

A further object is to provide simple and efficient globe-holdin g devices for electric-arc lamps.

A further object is to provide a carbonholder which shall be simple in construction, easy to manipulate, and which shall operate accurately to hold the carbon in proper position.

A further object is to provide simple and efficient means whereby to facilitate the trimming of the lamp.

A further object is to improve various features of construction of an electric-arc lamp and to so construct the lamp that it shall be accurate and noiseless in operation and effectual in all respects in the performance of its functions.

iVith these objects in view the invention consists in the combination, in an electric-arc lamp, of a separating and feeding magnet, a holder connected with the armature of said magnet, clutch-rings carried by said holder and adapted to engage the carbon, and contact devices also carried by said holder and adapted to bear continuously against the carbon 'for the purpose of conducting current thereto.

The invention also consists in a separating and feeding magnet for arc-lamps, having a conical core or pole-piece anda conical armature, one adapted to enter the other, and the faces of the two cones arranged at an angle to each other; and the invention further consists in certain novel features of construction and combinations and arrangements of parts,as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure I is a sectional view of an electric-arc lamp embodying myimprovements. Figs. 2, 8, 4, and 5 are views illustrating the holder for the inner or arc-inclosing globe. Figs. (3, 7, S, and D are detail views illustrating the combined clutch and contact devices. Figs. lO and Il are detail views of the lower-carbon holder. Figs. 12 and 13 are views illustrating modiiications of the lower-carbon holder. Figs. 14, I5, and IG are detail views illustrating the connections of the inner-globe and lower-carbon holder with the depending arms or uprights of the lamp. Fig. 17 is an enlarged view showing the closed coil anda portion of the primary winding for the separating and feeding magnet. Fig. 1S is an enlarged detail View of the core and armature of the magnet.

A represents the iron frame or shell of the feeding and separating magnet, to the upper end of which a cap or casting l is fixed andy terminates in an upwardly-projectinghollow shank 2. An insulated screw is secured to the upper end of the shank 2 for the attachment of a suitable device by means of which to suspend the lamp.

IVithin the shell A the core or pole-piece A of the magnet is fixed and depends partially through the same, said core or pole-piece being made with a deep recess i in the form of a truncated cone for the reception of the similarly-shaped upper portion 5 of the armature t3 of said nmgnet. he core G is disposed within the shell A, and its lower end terminates within a chamber 7, formed by a cylindrical casting S, of iron, fixed tothelowercnd of the shell A and forming, in effect, a part thereof. rihe chamber 7 is lined with sheetbrass or other suitable non-magnetic material a, and against this lining the armature (i has a neat but sliding contact, said lining extending somewhat above the lower end of the core A and inclosing the same. The cylinder or casting S thus constitutes a dash-pot for the armature G and in which said armature acts as a plunger.

The armature G is made with IOO a longitudinal opening lO, in the upper end of which a tube 11 is secured, said tube extending up through the center of the core or pole-piece A and terminating within the tubular shank 2 ot casting 1, its upper end being closed air-tight by means of a cap 12. The helix 123 of the magnet is located within the shell, and also located within said shell is a closed coil or conductor 1i. This closed coil may be placed within the helix 13, or it may be wound around it, or the magnet may be provided with sectional windings, one constitutin g the workin g helix and another forming the constantly-closed conductor. The armature of the magnet will be connected with the upper carbon of the lamp in a manner which will be hereinafter explained in (let-ail.

XV ith the constantly-closed coil or winding on the magnet, when the circuit is closed through the lamp, current will be induced momentarily in the closed or secondary winding in a reverse direction to the direction of current through the working or prim ary coil or helix. The current thus induced in the closed or secondary coil will tend to weaken the lifting-magnet and cause the arc to be drawn slowly, the secondary current becoming gradually weakened until it ceases altogether and the are shall have been drawn to its t'ull length. `\Vhen the current is cut out of the lamp, there will be a secondary current induced in the closed or secondary coil in the same direction as the current through the workin g helix. This will increase, for an instant, the strength of the then-weakening magnet and thus cause the lamp to cease slowly instead et abruptly. These same aetions will occur in a less degree with any change of voltage in the circuit or in case the arc should be momentarily interrupted from any cause, and thus maintain a constant and regular tlow of current at the are. The seeondary circuit being only momentary does not attect the magnet nor the light ot the lamp when the current is steady, but only when there is a vfluctuation in the circuit, and thus has the advantage ot' steadying the are and causing the lamp to burn very steadily without much external. resistance, resulting in greatly increasing the ellicieney of the lamp without loss through a resistance such as heretofore used.

By the useof the closed secondary winding arc-lamps can be burned on circuits et but little higher voltage than the voltage of the arc, instead of wasting a large amount of energy through a resistance,an d greater steadin ess in the burning' of the lamp can be attained than is possible when such resist-ance is employed. The use of the closed secondary coil or winding enables lamps to be started and stopped smoothly without jumping and is part-icularly advantageous when a number of lamps are burned in series on high-potential circuits. The reactive eiiect produced by the closed secondary coil or winding can be used to advantage on the shunt-magnets of lamps burning on constant-current circuits, the result being to prevent too sudden changes in strength of the shunt-magnet due to changes in the length ot the are or abnormal Vfluctuations in the current.

The core of the separating and feeding magnet and its armature comprises, as above mentioned, two cones, one adapted to enter the other. It will be observed that the wall of the conical recesslin the core ol the magnet is not parallel with the conical .tace ot" the armature, but at an angle thereto. This is a matter of importance in :uljusting lamps to operate under certain conditions. lly changH ing` the angle ot the recessed cone to that ol.' the entering cone the pull of the magnet can be changed to any desired range, so that when an arc is drawn too long the armature will be drawn into a weaker portion of the magnetic circuit and thus cause the arc to be corrected. By the arrangement ol the cones above described the pull of the magnet can be made te remain constant throughout a predetermined range of movement ot the armature by making the relative angles el' the lj'aces ol the two cones such that the air-gap at the points a 0/ will remain constant through this range. This can be accomplished by having the sum oi the distance at the points .fzi'fji/ average the same throughout the range, other fluctuations in the strength of the magnet, such as the magnetic gap at the entering-point of the armature, having been corrected. lt' the angle of the entering cone is less than the angle of the recessed cone, the pull ot the magnet will constantly grow weaker as the armature is drawn into the recess, while the reverse ot these angles will produce the opposite result. Thus it will be seen that by careful arrangement olf the two cones a variety of results can be attained, such as a strong pull of the magnet l'or a portion ol:- the range oi movement of the armature and a gradual decline at the .linish, or vice versa. l have l'ound it to be oli' advantage iu lamps burning in series on high-potential circuits to have the pull ol:- the magnet constantly decreasing as the armature rises. This is exactly opposite to the pull oliI an ordi nary solenoid as is commonly used in arc-lamps. l have :found that 'for arc-lamps for use on one-hund red-and-ten-volt circuits it is ot' advantage to have the magnet produce a unil'orm pull on the armature throughout the ordinary litt ot the carbon and troni that point rapidly weaken, so that in ease the lamp receives an abnormally high potential the armature will not rise in proportion tothe increased vol tage ol' the circuit and draw arc so long thatY it will, break and cause thelamp to tlicker. ln this case the angles ot the laees ot the two cones would be such that a lamp burning at one hundred and ten volts would draw an eightyvolt are, while the increase oi ten per cent. in the potential ot' the lamp would not increase the are over Five per cent.

It is desirable to provide proper ventilation IOO ITO

for the windings 13 14:, and for this purpose openings 15 are made in the armature-casing and through the lining a. For the same purpose the shell A is made with elongated slots 1G and the core or pole-piece is made with holes 17, which communicate at one end with the conical recess and at the other end v.. h the interior of the casting 1, the shank 2 of the latter being made with slots or openings 1S. The sheet-metal casing 19, whiehin closes the operatin g mechanism of the lamp, provided with air-vents 20. A free circulation of air will thus be permitted to keep the inside parts of the magnets and the windings cool without allowing a current of air in the 'inclosed chamber 7, as the armature o constitutes a seal for said chamber below the openings 15.

An internally-serew-threaded collar 21 uepends from the cylindrical casting 8 in line with an opening 22 in the bottoni of said casting. An annular box or easing 215, having an opening in its top, is disposed below the easting S and provided with an internally-screwthreaded collar 24 for the reception ot' the collar 21, depending from the casting 8. rlhe box or casing 23 is provided at its bottom edge with an internally-screw-threaded annular iiange 25 for the reception of screw-threads on the periphery of a dish-shaped castin 2U, which constitutes the bottoni of said box or casing The parts 23 and 2G thus constitute a receptacle or casing'` for inclosing the clutch and contact devices for the upper carbon, and the said casting or bottom 2o is provided centrally with a flattened enlargement 27, in which a hole is made for the passage ot the upper carbon 28. A tube 29 is secured at its upper end to the lower end ot the armature (i, so that its bore will aline with the bore of said armature. The tube is adapted 'to loosely receive the upper carbon 28 and passes freely through the collar 2l, terminating in the box or receptacle 23, preferably at or near its center, and carrying the clutch and contact devices for the upper carbon. ln constructing these clutch and Contact devices a horizontally-disposed plate SO is secured to the tube 29 at a point near the lower end ot' the same, and from the periphery of this plate a circular casing 31 depends, the lower end oi' which is contracted or made with an inwardlyprojecting flange .52, said casing 'forming an open-bottom clutch-pan, the rings 323, constituting said clutch, being adapted to rest on the inclined flange of the clutch-pan and against the carbon-rod when the lamp in operation, as shown in Figs. 1, t5, aut- .l. Vllhe clutch-rings are made with roughencd peripheral grooves whereby to cause them to properly engage the carbon-rod without d anger of slipping, and said clutch-rin are disposed within a slotted carrier 3l, supported from the plate SO by means of screws 35, the upper ends of which pass loosely through said plate, and the carrier is provided in its top with a hole 36a for the reception of the lower extremity ol the tube 29. ln Fig. 8 of the drawi three clutch-rings are shown, and they are maintained in proper position by means ol a horizontally-disposed rin g 3G passing through them. A series of contact-rings 53T, constituting the contact-brush for conducting current to the upper carbon, are mounted in the slotted carrier Si and alternate with the clutch-rings 33, the horizontal ring also passing through said contactrlngs and serving to constantly support the saine in contact with the carbon. rlhe contact-rin JST have smooth peripheral grooves to conform to the contour ot the carbon and are made equal in diameter to that of the clutch-rings, but with thicker or wider walls, so that they will be supported by the ring 230 somewhat higher than the clutch-rin gs.

llhen current is passing through the lamp, the position of the clutch devices will be as shown in Figs. 1, G, and 9, the clutch-pan and slotted carrier being elevated above the bottoni 2G of the casing which incloses them, and the clutch-rin gs being clamped or wedged between the carbon-rod and the inclined flange 32. rihe rings 37 bearagainst the carbon-rod and are maintained in proper contact herewith by means of a weight 3S, placed upon them.

lt is obvious that when the feeding oi the upper carbon becomes necessary the clutchpan and slotted carrier will niove downwardly until the carrier engages the enlargementl27 of the casting 2G, when it will be caused to move upwardly on the tube 29, as shown in Fig. 7. The clutch-rings will at the saine time engage the enlargement 27 of casting 20 and be thus caused to rise slightly, so as to loosen their grip on the carbon-rod and permit the latter to feed. The contactrings 37, being more elevated in the carrier 3l thanl the clutch-rings 33, as above cxplained, they will not come in contact with the casting 2U when the clutch-pan and carrier are lowered, and hence the engagement ot the contact-rings with the upper carbon will be constant under all conditions.

The box or casing which incloses the clutch and contact devices, is made with a laterally-projecting annular flange 39, beneath which a ring O is disposed and insulated thercfrom, a spring-cushion 4:1, for the outer globe i2, and sheets a3, oli' insulating material, being located between said `flange 30 and ring it). 'lhe ring l() is made with pcripheral segmental tlauges at-1, adapted to receive and support similar segmental flanges a5, projecting inwardly from an annular plate or ring at), the upper face of which has an air-tight bearing against the spring-cushion 11, or, more strictly speaking, against the lower insulating-sheet a3, on which said cushion rests. The plate or ring -16 is provided with adepending peripheral `flange 47, the lower edge ot which is curved inwardly, as at #18, and l'orms a scat for packing-ring all, on which the shoulder 50 at the upper edge oi lOC/ the outer globe regte, edge of said globe ha 'in 'the under face ot' the annuh plateor ring` ,t(

The ring l() is made with r threaded bosses J t Y A r a eloFie lit agan rt i so as the annular ie with the rpaeee beil l i D A to give the `globe a one-sixth tu" bring the eegnientai ilanges; oi' plate or rin;D AY(3 in lh tween the seig'inentali" e innato The g3g-lobe ii ean then l and will he be lor-ferreaY Support-ed by the ehaiin' 5S.

The rode 52 Support at their lower endf a yoke or braeket 5i, and the latter earrioev the holder for the inner or are-inelofsing,` globe 55 and the holder for the lower Carbon ot the lanip. ln order that" the are-inelosing globe and the lower-earlmn nolder ean be readily renioved, the yoke or braeke; 5l, which earries them, is eonneeted with the rode` or uprights 52 in the following, `inanner: ilaeh end et the voke or braeket 5t is; inade with a hollow bose or enhtrgeinent 56, open at on o eide, as at 5T, and haring an internal Shoulder 5S at its upper end and luge 5t) GO, project-ing' towa d eaeh other in the opening` 57. The lower end of eaeh rod or upright 52 is provided with shank (il, having two enlargeniento o2 (Si), adapted to enter the hollow boseee 5G and be prevented freni eeeape therefroin by the luge 50 GO, the en argeinent o2 on the shank Jl being,` adapted to receive the shoulder at the upper end oi the bese. The yoke or bracket 5i ifi eoni eeted in the saine manner to both rode or arias 553, exeept that the lateral opening 57 of one bose or enlargement tis at oppoeite side thereof from the lateral openingjr 5T et the other bees or enlargement. Thus it will be @een that bj.'v raieing the yoke or braeket 5i ani' then turningl it slightly it can be rea/.liliv detaehed trein the rods or etaudarde 5i?.

The yoke or bracket 5ft is provided eentrally between its ende with a eireular enlargement or base Git, havinigI external Serowthreads G5 and an annnlarreeess Gti, in which latter a peeking-ring U7, oi aebeetos or other Suitable material, is plaeed and adapted to reeeive the lower Vflanged edge el the inner or are-inelosing globe 55, the latter being provided with a valved eovero1l through whieh the upper earbon paeses. fr eollar or eap o8 is adapted to isere v on the enlargement or base lj-t, and made with an inwardly-projeeting` enrved .ilange or lip titl, within whieh and above the upper edge oi the reeeseed portion of the enlargement or base (ift an ann'ular eoiled si ring TO disposed. The lower hanged end oi the inner globo havingbeen seated in the reeessed base Git, the eap or eol- Oholdili the ilangie oi' the f zlobe i its wat in the base oi olf the l the epiingr beine' l'oreed down toward Said basse ae well an be'i g; eonl1raete 'l, zu; ehe in in Figs. -t and it irs aip'iarent that by unserer-Jing the eap or Collar (3S the annular eoiled' Spring 7 will be permitted. to ex,- pand, as :shown in lfige. L and and thin; perinit the removal oi the inner globe.

The base olf the inner-globe holdei iri made withV an opening` Tl. VFor the aoeoininodation t lo\.\er-earlion holdii 72 f pering` enlargement 77, adnp ,ed to engage the tapering wall ot the i pper poi tion 73 oli' the opening 7l. i `ro1n this eonfstrnetion it will be Seen that when the nnt is screwed up the lower Carbon will. be tightly elainped within the split ,ileevi T5.

inetead et' the eonastruetion ol hold er lor the lower earbon above deeoribed, that Shown in l2 might be en'iployed. in this torni. the inner-globe holder if; niade with a ta'xperine Screw-threaded iioeketi 'Tf-3 tor the reeeption ol;I the tapering Serew-threaded lower end Tf) ol.' the split Sleeve or socket-piece S0. ji posit Si is inserted in a Socket in the base ot and projeete up rardly vithin the sleeve or :soeketipieee SO, terniiimting` at .itev upper end in a head S2, which siervos as a support :tor the lower Carbon.

In the forni of carbon-holder shown in i3 the base oiifi niade with a deep Socket Sil, havingl a tapering` eerew-threaded portionr at Vite lo ver end i'or the tapering serew-threaded portion Si oi' the Split Sleeve or emifketpiece 85, the diameter olf the see-'kot Si) above the Serewdhreaded portion beine; aul'iieientl)v greater than the external diameter ot' the sleeve or ooeket-pieee S5 'to permit the expansion oi the latter for the insertion oi the earbon. fr recessed. trarne SG eneirelesl the box or easing; 233 and ieprovided with Si ripe` S7 of iniea, on which a `wire of low resistance Srl wound. rilheporiitive leading-in wire 'o oithe lainp is Connected with the inae'net traine or Shell, lfrom which it paoseo lo the elut(:li-pan and carrier and eontaet-rings to the upper Carbon, then to the lower Carbon, and then thmngh the voke or b laeket 5t and rods 52 to the ringgtO. ihe fieg'inental flanges ot' the ring' -ltl being in eleetrieal Contact with the segmental .flanges oiI the ringorplatolti, eu rrentwill pass frein the former to the latter and then. through a ewiteh Si), then through the low resistaiufe SS, and 'linally out through 'ihufi it will be seen that globe is hav/ered7 as above exthe ininnS-wire c. when the outer i he IIO plained, the circuit will be opened on ae count of the disengagement of the rings 40 and 4G, and it will therefore be impossible for the trimmer to receive a shock while trimming the lamp, even though he should forget to turn the switch.

Various changes might be made in the details of construction of my invention without departing from the spirit thereof or limiting its scope, and hence I do not wish to limit myself to the precise details herein set forth.

IIaving fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In an are-lamp, the combination with a magnet-core and armature, of a helix encircling said core and included in series with the earbons of the lamp, a constantly-closed conductor also encircling1 said core, whereby to effect the gradual starting and stoppin g of the lamp, and a clutch supported by said armature, substantially as set forth.

2. In an arc-lamp, the combination with the pole-piece of a magnet, an armature arc-starting mechanism and connections between the arc-starting mechanism and the magnet, of a helix encircling said pole-piece and armature and included in the lamp-circuit, and a constantly-closed conductor also encircling the pole-piece and armature, whereby to effect the gradual starting and stoppin g of the lamp, substantially as set forth.

A separating and feeding magnet for an electric-are lamp having a conical pole-piece and a conical armature, the adjacent conical faces of said pole-piece and armature being disposedpat an angle to each other, substantially as set forth.

4. A separating and feeding magnet for an electric-are lamp having a conical pole-piece, and a conical armature, one adapted to enter the other and the faces of the two cones arranged at an angle to each other, substantially as set forth.

5. In an electric-are lamp, the combination with suitable framework and a clutch, of a separating and feeding magnet having a conical recess in its pole-piece or core, an armature having a conical end to enter said conical recess, the conical face of the armature being disposed at an angle to the face of the conical recess in the pele-piece or core and connections between said armature and clutch,substantially as set forth.

G. In an arc-lamp, the combination with the separating and feeding magnet having a hollow core and a hollow armature, of a tube attached to and communicating with the armature and passing loosely through said hollow core, a tube depending from the armature and clutch devices connected with the lastmentioned tube, substantially as set forth.

7. In anelectrie-arc lamp, the combination with a magnet-shell, of a hollow cap or casting fixed to the upper end thereof, a polepiece secured within said shell, a hollow arn mature also disposed within the shell and constituting the plunger of a dash-pot formed at the lower end of the shell, a tube connected with the upper ond of the armature and terminating within said hollow cap or casting, a cap closing the upper end of said tube, a tube depending from said armature, and clutch devices connected with said last-inentioned tube, substantially as set forth.

S. In an electric-arc lamp, the combination with a magnet-shell and a cylindrical casting secured within the lower end thereof, of a core depending' within said shell, a helix within the shell, a lining in said cylindrical casting said lining inelosing the lower end of the core, an armature disposed within the shell and helix and having a sliding fit in the cylindrical casting, a tube depending from the armature and clutch devices carried by said tube, substantially as set forth.

O. In an arc-lamp, the combination with a carrier, of clutch-rings for the upper carbon, mounted therein, contact-rings also mounted in said carrier, and means for operating the elutehrings without moving the contactrings from the carbon, substantially as set forth.

lO. In an arc-lamp, the combination with a clutch-pan and a carrier mounted therein, of a set of clutch-rings mounted in the carrier and adapted to engage the upper carbon, means for movin g said clutch-rings te release the carbon, and contact-rings also mounted in said carrier and disposed in a higher plane than the clutch-rin gs so that they will not be affected by the operation of said clutch-rin gs, substantially as set forth.

ll. In an arc-lamp, the combination with a slotted carrier adapted to permit the passage of the upper carbon through it, of a series of clutch-rings having roughened peripheral grooves, mounted in said carrier, a series oi' contact-rings mounted in said carrier and alternating with the clutch-rings, said contactrings being of the same diameter as the clutch-rings but having thicker or wider walls and a supporting-ring passing through all of said clutch and contact rings, substantially as set forth.

l2. In an are-lamp, the combination with the armature of the separating and feeding magnet, of a clutch pan or receptacle connected therewith, a vertically-movable slotted carrier supported in said pan or receptacle7 clutch-rings mounted in said carrier, a horizontal ring passing through said clutchrings, and a device adapted to be engaged by said carrier and clutch rings, whereby to cause them to move upwardly and the carbon to feed, substantially as set forth.

I3. In an arc-lamp, the combination with the separating and feeding magnet and its armature, of a tube depending from said armature, a plate secured to said tube near its lower end, a easing depending from said plate and having an inclined flange at its lower end, a vertically-movable carrier within said casing and having a hole to' receive the lower TOO IZO

end of said tube, Clutch-rings mounted on Said carrier and adapted to bear againet Said inclined flange and the Carbon-rod, a horizontal ring passing through the Clutch-rings, aiu a deyiee to be engaged by said eluteh-ringe` and Carrier, eubstai'rtially ae set forth.

lit. ln au are-lamp, the Combination with a inab iet-Shell, a eylindrieal Casting eeeurerY thereto and an armature withinv said Shell, of a box er easing secured to Said eylindriea Casting, a removable bottoni for Said boxA or eaeing an d having an. opening for the passage of the Carbon, a tube eeeured to the ra'niature and /aeaiug .into said ook or easing, a elutehpar Seeured to Said tube, a earrier in. said eluteh-pztn, el etch-rings in said earrier and pan and adapted to engage the bottoni of the box or easing to permit the carbon to feed, anda horizontal ring passing through. said elutelrrings, substantially as Set forth.

15. ln an areelainip, the Combination with the framework, of a rin g removably attaehed to Said framework, having a flange adapted to reeeiye and Support a globe and a cushion aga-inst which Said ring bears, subetantially as set forth.

1G. ln an are-lamp the combination with the :framework of a ring Supported thereby, a spring-'cushion above said ring, an annular plate adapted to b removablyseoured to Said ring and bear aga' rst Said Spring-euehion, a eured flange depending from. Said annular plate, a; globe, and a paolung-r'ng between the "ieri )heral flange of the flo .nt

l. o 1 21 Y eurved flange on the annum platte. Sube' tially as Set forth.

17. ln an are-lamp, the the framework, of a ring f insulated therefrom, a gl Combination with eeured there' o a nl e-holder reino'w ably connected with said ring, s, lower-earbon holder, eleetriezl eonneetirns between Said carbon-holder and i g, d ring` and globerolde eonetituting part of the eireuit through the lamp, so that wh i the globe and itS holder are removed, the open-eireuited, Subetantially as Set lS. in an melanin, the eonl`V for 1h. i iinai ion with the frainewor, and an insulated ring eupi Said eeen red to ported thereby, Y ring, a yoke or b"-iel.:et renioi'ab y Y T 1. thelowerende et.l drone, and ai Minoli-,filiale holder and lower-t .rben helder s of 'roda deneni ng fr.-

upported by Said yoke or braeket, sul` stantially forth.

19. ln au are-lamp, the Combination with the fre-newl rk, of two depending ro sup ported 'thereby and insulated therefron'i, buttons or enlargements; on the lor-:er ends ol: Said rods, a yoke or br: eket, hollow bosses at the ende of uaid yoke r bracket, luge projecting into said openings, and internal Shoulders at L' the recepthe upper ende o Said bosses lo? on the et forth.

tion of the buttons or enlargeine'i 20. A globe-hold er comprising a base,an addepending rods, substantially ae justable eap thereon anda spring-ring within said Cap and adapted to be foreed ag ailst the globe by said ap, substantially ef the forth. l. globe-holdereoinprieinga baee,an adi table cap thereon, and an annular eoiled Si iV 'adapted to be loreed by Said cap, ag: et the ilange oit' the globe whereby to foree the latter againet te uit, snbsiant ially as; eetforth.

fr globe-hohlereoniprieingabaee,an adjustable can thereon, said een haring an inwardly-Curved flange, and an elastic ring i dapted to be foreed against the flange or shoulder on the globe by .said curved `iange on the eap, Substantially as set forth.

l. A 'l'lobeeholder eoinprieing a base haring external e row-tl;reads, a` eap adapted to eerew on said baan, said eap having an in-y wzudly-curved annular flange at its upper edge, andan annulareoiled Springwithii Said eur-ved annular flange, Snbutaiitially z s; set forth.

2l. A gloljle--nlder .voinjyn'ieing a recessed w base, a paeking-di ik thereon, a serew- :an on said base, e l ea) h at threaded projection, a device within Said eap adapter to be foreed by the cap against the flange of a globo whereby lo clamp the latter to the bano, and a Split sleeve passi ng through the hele in the bane and adapted io receive; Carbon, said eleeye li;..\.'ii1ga tapering portion to bear against the tapering wall of the hole in the balie and a nut to Sereni in the aerewthreaded 1portion of eaidhole in ilxebaee, sul stantially as set for h.

2G. The eouibinatiini in an are-lamp, ot a Sel'laraiing an'l 'eenling magnet and the earbons, a frame, stripe of iiuiulating material Supported by riale f 'ein 5, and a low r .\eistanoe found on said briig rs and ineluded in eireuit with the separa ing and feeding magnet and the f.-irl ona, Suben `utiaflly set forth,

27. ln an are-lamp, the combination with the framework and a low reeietanee, et' an insulated ring sumlorted by the framework, a globe-holder -en'ioi'ab yattaehed to said ring, l .rer-ea rbon holder inelueed in eireuiIV with the Sa'd ring' and globe-holder, and a ewiteh between said globe-holder and resistance, Substantially as set forth.

f l have signed prefs.

GEORGE R. la 41.3K.

IOO

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