US1218598A - Process of drawing molten material in cylindrical form. - Google Patents

Description

E. BANNER. PROCESS OF DRAWING MOLTEN MATERlAL'lN CYLINBRICAL FORM.

APPLICATION FILED HB.2l.19l6- Patented Mar. 6, 1917.

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. N UK E.DANNER. PROCESS OF DRAWING MOLTEN MATERIAL IN CYLINDRICAL FORM.

APPLICATION FILED FEB- 2|| l lfi- 1,218,598. Patented Mar. 6, 1917.

5 SHEETS-SHEET 2- 6% I INVE'TH I Q: Q 4,

E. DANNER.

PROCESS OF DRAWING MOLTEN MATERIAL IN CYLINDRICAL FORM.

APPLICATION FILED FEB.2I. l9l6. 1,21 8,598. Patented Mar. 6, 191-7.

5 SHEETS-SHEET 3- E.- BANNER.

PROCESS'OF DRAWING MOLIEN- MATERIAL IN CYLINDRICAL FORM.

4 APPLICATION FILED FEB-21. I916. 1,218,598. 'PatentedMar. 6, 1917.

5 SHEETS-SHEET 4.

' E- DANNER.

PROCESS OF DRAWING MOLTEN MATERIAL IN CYLINDRICAL FORM APPLICATION FlL I Patented Mar. 6, 1917.

5 SHEETS-SHEET 5.

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MWUIIMHTW L i I?!" illllllklllllflll-illlllllllllllllll"Hilli- ED STAT i. ATE,

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EDWARD BANNER, OF TOLEDO, OHIO; ASSIGNOR TO THE LIBBEY GLASS COMPANY, OF

TOLEDO, OHIO, A. CORPORATION OHIO.

rnocnss or nnawme MOLTYEN MATERIAL IN CYLINDRICAL FORIVL,

Patented Mar. 6, 1917.

Application filed February 21, 1916. Serial No. 79,660.

. To all whom it may concern:

Be it known thatl, EDWARD DANNER, a citizen of the United States, and a resident of Toledo, in the county of Lucas'and State of Ohio, have invented a certain new and useful Process of Drawing: Molten Material in Cylindrical Form; 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, reference being had to the accompanying drawings, and to the characters of'reference marked thereon, which form a part of this specification. I

This invention relates more particularly to the glass working art, and especially to a process for continuously drawing glass or. other molten materialin cylindrical form.

The primary object of my invention is the provision of an improved process for drawing glass in cylindrical form in a simple,

, rapid, inexpensive and continuous manner,

I with the outer end portion of the.cylinder whereby the output is materially increased and a material saving in expense and labor effected over the methods heretofore employed. I v j The invention is fully described in the llowing specification, and whileit is capable of being carried out and ractised by numerous apparatus, only a f ew of such apparatus are illustrated in the accompanyin'g drawings, in which.-

Figure 1 is a side elevation of an apparatus employed for practising the invention supporting wag and the cylinder drawing means remove Fig. 2 is an elevation of one form of cylinder drawing means and an associated portion of the cylinder sup:

porting way. Fig. 3 is an enlarged rear elevation of the apparatus, with a part broken away. Fig. '4 is an enlarged section on the line 44 in Fig. 3, with the member from which the cylinder is drawn in the form of a blow-pipe for drawing tubing. Fig. 5 is a section on the line 55 in Fig. 4. Fig. dis a. plan view of the appw ratus with a portion in section on the 111116 6-6 in Fig. 5. Fig. 7 illustrates a slight modification of a ortioIi of the tube draw-- ing process; and ig. 8 is a sectional' 'view of the blow-pipe adapted for the drawing? I of material in solid cylinder form theretransferred from another furnace and maintained in its molten: state by the presence of a high heat within the furnace, as by the burning oii gas, oil, or other suitable fuel therein. The molten glass is introducedinto the furnace 1 through an opening 4 in its upper portion, which opening is closed by adoor 5.

The discharge end of the trough 3 extends through an opening 6 in oneside wall of the furnace and projects into an adjoining furnace chamber 7, which is provided with its own heating means, as for instance, from gas or oil burners 8 located in the bottom thereof. .Theflow of molten glass from the discharge end of the trough 3 is controlled by a. gate 9, which extends down through the top wall of thepassage 6 of the furnaoe and into the trough, being mounted for vertical movements to vary-the size of the opening between its lower end' and the trough bottom, as is apparent. The gate 9 may be suspended from athreaded stem 10,

which projects up through a support ll on the furnacetop and has an adjusting Wheel 12 threaded onto its upper end and resting j on the support 11. It is preferable to make the trough 3 of stepped formation, as shown in Figs. 5 and 6, it being found in practice that the flowing of molten glass from one level to another of the trough tends to eliminate air bubbles therefrom. With the present apparatus the molten glass, when introduced into the furnace, is deposited onthe upper stepor level of the trough 3 and then flows therefrom to the lower level 'of the trough, in which. it is partially banked bv the gate 9.

A member 13,; which, if the apparatus is to be used for tube drawing, may be termed a, blow-pi e, ismounted on an incline in the furnace c amber 7 transversely of the discharge end of the trough 3 and below the same in position for the molten glass to be deposited thereon as it flows from the discharge end of the trough. This blow-pipe 60 I ient -form. In practising my invention 'm.

.preferably covered with a shell 15 of fire sure reducing valve so that the pressure cla or other suitable heat-resistin materlal, and this shell is preferably gra ually reduced in diameter toward its outer end. The end of the blow-pipe 13, which projects through the rear wall of the chamber 7, has connection, through a pipe 16, with a low,- pressure air tank 17, which in turn receives its supply of air from a high-pressure tank 18 through an, intermediate connection 19, (see Figs. 3 and 6). The connection 19 between the two tanks is provided with a presin the tank 17 may be reduced to any desired extent irrespective of the pressure in the tank 18. 21' designates a supply pipe which leads into the high-pressure tank 18 from any suitable source of air pressure su ply. While it is preferable to connect th blow-pipe passage With a source of air under constant pressure, it is found that tubing can be drawn if air under atmospheric pres-- sure alone is permitted to flow from the discharge end of the blow-pipe into the tubing.

It will be understood in the carrying out of my process in the drawing of tubing that a small stream of glass A is caused to flow continuously, during an operating of the apparatus, from the trough 3 down onto the shell 15 of the blow-pipe 13 at a distance from the outer or discharge end of the blowpipe, and to wind on and flow down the blow-pipe toward and from its discharge end in an evenly'formed film or covering thereon, as the blow-pipe is rotated, as best illustrated in Fig. 4.. The fihidit'y of the glass causes it to flow dowmthe incl ned blow-pipe and to ass from the discharge end thereof in the orm of a tube, the size of the tube, within certain, limits, being determined by' the amount of air discharged therein througlh' e shafts 26 are rearwardly inclined, substanthe blow-pipe 13, the temperature of t 7 glass at the point at which it leaves the blowpipe, or the speed of drawing of the tubing, or by all of these causes, as is apparent to persons skllled in the art. The glass tubing,

' which is designated B, extends downward and forward from the discharge end of the blow-pipe, and re'sts'o'n a supporting trough or guide-way 22 provided therefor in advance of the furnace, as illustrated in Fig.1.

This tube supporting trough is of considerable length, and provided therein at a considerable distance from the furnace is a tube drawing device 23 of any suitable or convenconlriection with the drawing of tubing of approximately of an inch in diameter, it

has been found that very satisfactory results misses so that the tubing-B is drawn from the blow-,

pipe ,at the rate of approximately 140? feet per minute. It will be apparent, however, that the length of the trough 22, the distance of the drawing means 23 from the furnace, and the speed of drawing of the tubing from the furnace maybe varied as desired or found necessary to meet difi'erent or changin conditions without departing from the that the specific description herein given is merely illustrativeof one form of apparatus for practising the invention and is not intended to limit or restrict the scopeofthe claims herein.

It will be understood; thatv after the tubing B passes through the draw-v spirit of the invention it being understood sarily, mounted forand rotated within the furnace chamber 7 concentrically around the blow-pipe in order that shell or casing 24 may be uniformly heated and thereby elfect a uniform distribution of radiant'heat to the entire glass surface shell. For this purpose the shell or cylinder 24 is mounted on two sets of transversely spaced rollers or wheels 25, which are carried by respective shafts 26 mounted without the furnace at the sides of the chamber 7 thereof. The rollers or wheels 25 project into the chamber 7 in supporting relation to the shell or cylinder 2 1 through registering openings in the furnace wall. The

tially inparallel relation to the axis of the blow-pipe, and are in connection at the rear of the furnace with a drive shaft 27 through respective sets of bevel gears 28, (Fig. 3). The shaft 27 has chain and sprocket connection 29 with a shaft 30, which has driving connection with a motor '31, or it may lead to any other suitable source )f power. One of theshafts 26 is in driving connection with the outer endportion of the blowpipe 13 at the rear of. the furnace through a suitable connection 32, which, in the present instance, comprises gears, sprocket wheels, chains, etc.

The shell or casing 24:- illustrated in Fi 4; is provided at its inner end with a funne shapedo ening or passage 24:, which gradually re ucesin diameter toward the outer the wall of the which flows down the blow-pipe Within the sistency before leaving the end of the blow of the glass on the blow-pipe, but in slightly spaced relation thereto, and the blow-pipe projects through such reduced portion of the shell and into the enlarged portion 24:

thereof. It is tlius evident that the escape of the highly heated products 'of combustion from within the furnace to the atmosphere through the reduced portion of the shell 24 is restricted, and that the projecting of the discharge end of the blow-pipe into the exposed chamber 24" causes a slight cooling of the glass to increase its 0011".

pipe to facilitate the drawing of the glass therefrom. It, is not necessary, however, to make the shell or casing 24 in the form shown or to terminate the discharge. end of the blow-pipe therein, as the invention has been practised by extending the conical portion ofthe cylinder passage to the end of the cylinder, or in other words, to adjacent to the furnace outlet opening 14 and projecting the discharge end of the blowpipe outward through the'opening 14 and a short distance therebeyond. The shell or cylinder 24 is preferably made of fire clay or other suitable'heat-resisting material.

It is evident from the foregoing description that in practising my improved glass tube drawing process, molten glass is permitted to flow down onto the rotating inclined blow-pipe at a distance to the rear of its discharge end and to wind around, be evenly distributed over, and flow down the blow-pipe, due to the gravity action of the glass in conjunction with the inclination of the tube and also to the drawing action of the means 23, or other suitable drawing means on the glass tubing. As the glass flows down the blow-pipe it passes through the highly and uniformly heated, gradually restricted passage 24: of the shell 24, and thence from said highly heated portion into a cooler zone, as for Instance, into an enlarged outer end portion 24 of the shell passage, which is in communication with the atmosphere, thus causing a slight cooling or increasing of the consistency of the molten glass at the point of drawing thereoffrom the blow-pipe and over the temperature thereof within the restricted portion of the shell. The glass quickly cools and acquires a substantially permanent set .form as it leavesthe end of the blow-pipe and emerges into the outer cooler atmosphere through the furnace opening 14. The air pressure discharged into the tubing from the blow-pipe 13, while preferably of only one or two ounces pressure when drawing small tubing, is const'ant in its action instead of spasmodic or periodical, as in the case of manually blown tubes, and tubing of more uniform and perfect character is therefore produced than with the manual and other processes heretofore employed.

In case it is desired to utilize my process.

for the-drawing of molten material in solid cylindrical form it is only necessary to close the communication between the interlor of the blow-pipe and the source of air supply,

or it can be accomplished by closing the discharge end of the blow-pipe by mounting an imperforate tip 33 on the discharge end of the blow-pipe, as shown in Fig. 8, which tip is preferably'of conical form.

It is found in practice that. glass drawn in cylindrical form with my process is not only uniform and more perfect in its formation,

p but is also practically free from the presence of air bubbles therein, due probably to the flowing of the glass in a small stream onto the blow-pipe and its winding on and flowing in a thin, film-like body down the blowpipe, such action apparently causing an elimlnation of air bubbles from within the glass. I

While I have above described the glass as flowing down the blow-pipe free from contact with the inclosing shell 24, it has been found in practice that the conical portion of the tube inclosing shell may be partially filled with glass and the thickness of the glass film on the portion of the tube without the restricted end of the shell regulated by the size of the restricted end of the passage or the width of'the annular space between the blow-pipe and restricted end of I the shell passage, as illustratedin Fig. 7. To obtain this action, the flow of the molten glass from the troughJ3, when the drawing is first started, is greater than the outlet passage in the blow-pipe inclosing shell will.

permit 'to pass therefrom, thus causing-a backing-up of the molten glass within the conical portion of the shell, after which the feed of glass to the blow-pipe is reduced so that it is approximately equalto the drawand permit it to continuously flow from the discharge end of the blow pipe in the form of a tube. These methods are not as practical, however, as the first above described, namely,of permitting the glass to flow onto and around the blow-pipe free from contact with the wall of the inclosing shell, unless possibly at the point of passage of the blowpipe through cal passage of the shell, as there is not so much possibility of collecting and retaining airin the glass with theform first described as with the modified forms described.

I wish it understood that the-forms of apparatus herein described for practising my invention are made for the purpose ofillustration and notto restrict the scope of the invention as defined in the claims, and that the process is not limited to use in connection with any particular apparatus,

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is 4 1. The method of continuously. forming tubing from molten material, consisting in supplying molten material to the outer sur-v face of a rotating member, drawing the material from said .member in tubular form, and introducing fluid into the drawn tubing through said member.

2. The method of continuously forming tubing from molten matter, consisting in supplying matter in a fluid state to and evenly distributing it on the outer surface of a blow-pipe-atthe rear df its discharge endand at one side of its axis, drawing the matter from the discharge end of the blowpipe in tubular form, the blow-pipe being inclined to facilitate such drawing, and

- discharge end, drawing the matter from the tilt introducing fluid into the tubing through the blow-plpe during the drawing operation. 3. The method of continuously forming tubing from molten matter, consisting in supplylng matter in a fluid state to and evenly distributing it on the outer surface of a rotating blow-pipe at the rear of its blow-pipe in tubular form, and introducing a constant streamof fluid of even ressure into the tubing through the blow-pipe duris ing the drawing operation.

4. The method of forming tubing from molten matter, consisting in supplying matter in a fluid state to and evenly distributing ing blow pipe at. the rt .of its disch frge end, drawing. the matter from 'the discharge end of the blow-pipe v in tubular form, and

introducin fluid into the tubing through the blow-pipe during the drawing operation. 5. The method-of forming tubing from molten matter, consisting in supplying mol-f ten matter to and evenly distributing it on the outer surfaceof abloW-pipe at the rear of 1ts discharge end, maintaining the matter in a highly heated atmosphere while on they blow-pipe drawing the matter from the dis- "'f charge en ofjsh'e blow-pipe in tubular form,

and ntroducingfa fluid into the tubing through the blow pipe during the drawing 'operationfif, t

the restricted end of the conimisses '6. The method of forming tubing, consisting in supplying molten matter to and evenl distributing it on the outer surface of a low-pipe at the rear of its discharge end and in a. highly heated atmosphere, drawing the matter from the discharge end of the blow pipe in tubular form, the blowpipe being inclined to facilitate such drawing thrtugh the blow-pipe during the drawing operation.

and-introducing fiu idinto' the tubing 7. The method of forming tubing from molten matter, consisting in positioning. a

rotating blow-pipe within a v furnace in which a high heat is maintained, supplying molten matter tothe surface of the blowpipe at the rear of its discharge end, draw-- ing the matter from the discharge end of the blow-pipe in tubular form, and introducing-a constant pressure fluid into the tubing through the blow-pipe during the drawing operation.

8. The method of forming tubing from molten matter, consisting in positidning a rotating blow-pipe in' inclined position within a furnace in which a hi 11 heat is malntained, supplying molten matter to the i surface of'the blow-pipe at the rear of its discharge end, drawin the matter from the discharge end of the lowipe in tubular form, and introducing a co stant pressure fluid into the tubing through the blow-pipe durin the drawing operati n.

9. he method of formi g tubing from molten matter, consisting in permitting molten matter to flow onto a rotating blowipe at the rear of its discharge end, drawing the matter from the discharge end. of the blow-pipe in tubular form, and introducing fluid into the tubing through the blow-pipe during the drawing operation.

10. The method of forming tubing from molten matter, consisting in permitting a tream of molten matter to flow onto an inclined rotating blow-pipe at the roan of its discharge end and at one side of itsaxis,

- drawing the matter from the discharge end of the blow-pipe in tubular form, and introducin fluid into the drawn tubingthrou'gh the b ow-pipe during the drawing operation.

lot

r '11. The method of forming tubing from molten matter, consisting mrotating a blow pipe in a high temperature, permitting a stream of molten matter to flow onto the blow-pipe at the rear of its discharge end, drawing the matter from the discharge end of the blow-pipe in tubular form, and introducing fluid into-the drawn tubing through ow in a regulated stream onto theblowgtmosphere, permitting molten matter to pipe rotates and to flow down the same in.

blow-pipe at the rear of its-discharge end,

the blow-pipe being rotated to Wind the matter thereon and being. inclined to permit a gravity flow of the matter down the blowpipe in encompassing relation thereto, drawing the matter in tubular form from the discharge end of theblow-pipe, and introducing fluid under a light pressure into the tubing through the blow-pipe during the drawing operation.

14.. The method of forming tubing from molten matter, consisting in rotating a blowpipe in inclined position within a highly heated chamber, permitting molten matter to flow onto the blow-pipe at the rear of its discharge end, to wind thereon as the blowencompassing relation thereto and; toward its discharge 'end, drawing the matter in tubular form from the discharge end ofthe blow:pipe, and introducing a fluidof prede termined pressure into the tubing during the drawing operation.

15. The method of constantly drawing glass tubing, consisting in permitting a regulated stream of molten glass to flow constantly onto a rotating blow-pipe at the rear {of its discharge end, whereby the glass is wound around and evenly distributed on the discharge end portion of the blow-pipe, constantly drawing the glass in tubular form at 'uniform speed from the discharge end of the blowipe, and introducing a constant pressure uid into the tubing through the blow-pipe during the drawing operation.

16. The method of constantly drawing glass tubing, consisting in permitting a regulated stream of molten glass to flow 0on stantly onto an inclined rotating blow-pipe at the rear of its discharge end whereby the glass is wound around and evenly distributed on the discharge end portion of the blow-pipe, constantly'drawing the glass in tubular form at uniform speed from the discharge end of the blowipe, and introducing a-constant pressure. uid into the tubing through the blow-pipe during the drawing operation. I

17. The method of forming glass tubing, consisting in permitting molten glass-to flow in a regulated stream onto a rotating in-' .clined blow-pipe disposed'in a highly heated 'chamber, constantly drawing the glass at a predetermined speed from the discharge end of the blow-pipe, and introducing fluid under light pressure .into the tubing through the blow-pipe during the drawing operation.

18. The method of forming glass tubing from molten matter, consisting in constantly supplying glass in a molten state to and evenly distributing it on the outer surface of an inclined blow-pipe disposed in a highly heated temperature, drawing the matter from the discharge end of the blow-pipe in tubular form, and introducing astream of fluid under light pressure into the tubing through the blow-pipe during the drawing operation.

' 19. The method of continuously forming glass tubing, consisting in constantly sup-' plying molten glass to and evenly distributing it on the outer surface of a rotating inclined blow-pipe at the rear of its discharge end, constantly drawing the glass from the blow-pipe in tubular form and at uniform speed, and introducing fluid under light pressure continually into the tubing through the blow-pipe during the drawing operation.

20. The method of continuously forming glass tubing, consisting in permitting molten glass .to fiowin a regulated stream onto an inclined rotatin blowipe at the rear of its discharge on the glass winding aroundand flowing down the blow-pipe and from its discharge end in evenly distributed tubular form, applying radiant-heat uniformly to. the glass on the-blow-pipe, drawing the glass at a constant continuous speed in tubular-form from the dischar e end of the blowpipe, and introducing a uid under a light pressure into the tubing through the blowpipe during the drawing operation.

21. The method of forming glass tubing from molten matter, consisting in rotating a blow-pipe within a furnace and projecting the blow-pipe into a shell-like member which has a restricted portion through which the discharge end of the blow-pipe projects, applying radiant heat to the outer surface of the blow-pipe from said shell, the heat at the discharge end of the blow-pipe being of lower temperature than the heat applied'to the blow-pipe at the rear restricted portion of said shell, permitting molten glass to flow in a'regulated stream onto the low-pipe at'the rear of the restricted portion of the shell, and thence to flow down and around the blow-pipe in evenIy"'distributed form, drawing the glass from the discharge end of the blow-pipe-in tubular form, and introducing fluid under light pressure into the tubing through the blowpipe during the drawing operation.

' 22. The method of formingglass tubing, consisting in constantly rotating a blowpipe in inclined position in a furnace and encompassing the discharge end portion of where y the glass winds around and is evenly distributed over the discharge portion of the blow-pipe and flows down the same, drawing the glass in tubular form at 'a constant uniform speed from the discharge end of the blow-pipe, and constantly introducing a fluid under light pressure into the tubing through the blow-pipe during the drawing operation. 23. The method of forming glass tubing,

' consisting in permitting molten glass to continually flow in a regulated stream onto an inclined'blow-pipe which is constantly rotating at uniform. speed whereby the glass.

' winds around and flows toward the dis:

' molten material in cylindrical form, con-' charge end of the blow-pipe, drawing the glass from the end of the continuous constant speed, introducing a fluid under light pressure into the tubing during the drawing operation, the glass being maintained n a high temperature during the flowing of the same onto and down the'bloW-pipe with the temperature diminished at the discharge end portion of the blow-pipe.

24. The method "of continuously drawing molten material in cylindrical form,'consisting in supplying molten material to the outer surface of a rotating member, and drawing the material from said member in cylindrical form.

25. The method of continuously drawing molten material in cylindrical form, consistng in supplying molten material to the outer surface of, an axially inclined elongated circular'member, and drawing it from said member in cylindrical form.

26. The method of continuously drawing molten material in cylindrical form, consistmg in supplying molten material to the outer sur ace of an inclined. rotating circular member, and drawing the material from said member in cylindrical form.

. 27. The method of continuously drawing sisting in constantly supplying material to the outer surface of an inclined rotating member of elongated circular form, and

continually drawin the material from said' member in cylindrical form the portion of %he material on the member being of tubular orm. v ,28. The method of drawing molten material in cylindrical form, consisting in supplying molten I material to and evenly dis-' tnbuting it on the outer surface of an inclined rotating member of elongated circular form, maintaining the material in a highly heated temperate while on the] blow-pipe. at a and 1 drical form.-

30. The method of continuousl drawing moltenmaterial in cylindricalv orm, con sisting, in permitting molten material to flow onto an elongated circular rotating 'member at the rear of its draw'ing-ofi end, and drawing" the matter from an end of said member in c lindrical form.

31. The metho of continuously drawing molten matter in cylindrical form, consisting in permitting a stream of molten mat-. ter to flow onto an inclined rotatin member of. elongated circular form at ie rear of its drawing-0E end, and drawin the matter from an end ofsaid member m cylindrical form. p

32. The method-of drawing mfilten matter in cylindrical form, consisting in ro tating an elongated a furnace, permitting molten matter to circular member within fiow in a regulated stream onto'said mem- 1 her atthe rearoffits drawing-ofi' end, maintaining said member in a high temperature which is diminished at the drawing-0E end portion of the member, and drawin the matter from said member in cylin rical form;

' 33. The method of drawing moltenm'aterial in cylindrical form, oonsistin in constantly rotating an elongated circu ar memlot) her in inclined position in a furnace. and

encompassing the drawing-0E :end portion thereo with a rotating shell disposed 'within the furnace and throu h the medium of which radiant heat is istributed to the member, depositing molten matter in a; constant regulated'stream onto said member at the rear of its drawing-ofi' end whereby the matter winds around and is 'evenly' distributed over a portion of said member and flows down the same, and drawing the matter in cylindrical form at a constant uniform speed from the drawing-0E end I of said member.

34:. The-methodof forming molten material in cylindrical form, consistin in permitting the molten material to ow onto one rtion of a rotating member of elongate circular form transversely thereof, drawing it from another portion of the member in complete enveloping relation; gthereto.

35;. The method of forming molten material in cylindrical form, consistingin-pggim mitting 'theii'aterial to new; in'a' regula- ,the material in tubular form stream onto one portion of a rotating member of elongated circular form and to be discharged evenly thereover, and drawing it in cylindrical form from another portion of the member lengthwise thereof and in a plane at an angle to a vertical.

36. The method of forming tubing in a continuous manner, consisting in permitting molten material to flow onto one portion of a rotating member, and drawing from another portion of said member lengthwise thereof. the interior of the tubing being in communication with a'source of fluid supply through said member.-

37. The'method of forming tubing in a continuous manner, consisting in permitting molten material to flow onto'one portion of a rotating member, and drawing the material in tubular form from an other portion of said member lengthwise thereof in substantially a horizontal plane,

the lnterior of the tubing being in communication with a source of fluid supply through said member.

38. The method of drawing molten material in cylindrical form, consisting in constantly rotating an elongated circular member in a furnace and encompassing the drawing-01f end portion thereof with a shell disposed within the furnace and through the medium of which radiant heat is distributed to the member, depositing around and is evenly distributed over .a portion of said member and flows down the .same, and drawing the matter in cylindrimatter in a constant regulated stream, onto said member at the rear of its drawing-off end whereby the matter winds around and is evenly distributed over a portion of said member and flows'down the same through said shell, and drawing the matter in cylindrical form at a constant uniform speed from the drawing-ofi'end of said member. In testimony whereof, I have hereunto signed my name to this specification,

EDWARD" DANNER.

v molten matter in a constant regulated streamonto said member at the rear of its drawing-off end whereby the matter winds.

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