fig1 is a partial perspective view of a typical mounted precious metal bushing assembly 7 including related hardware used to form glass fiber from molten glass . a bushing 2 , typically made from a platinum / rhodium alloy having a rhodium content ranging from ten to about thirty percent , typically 20 - 22 percent is encompassed in a mount 13 . the bushing 2 comprises conventional sidewalls , end walls in a known manner . the bushing 2 also comprises a tip plate 8 having a plurality of tips , nozzles , 14 welded to or formed from the tip plate 8 . the tip plate 8 , that can be just an orifice plate with out tips surrounding orifices in the orifice plate . the bushing 2 is electrically heated by connecting to an electrical input via a conventional terminal ( not shown ) on each end - wall , or sidewall , of the bushing 2 in a known manner . only one end of the bushing is shown in fig1 because the other end is identical except that the cooling tubes are not always bent , but extend straight to conventional cooling fluid , usually process water , supply hoses ( not shown here ). the bushing 2 is contained in conventional refractory material 4 in a known mounting frame 13 that holds a top of the bushing 2 against a refractory surface around an orifice in the bottom of a forehearth of a furnace . the frame 13 , typically made of stainless steel , comprises side rails 15 held in a spaced apart manner by a cross member 17 at each end of the side rails 15 . conventional insulating refractory castable 4 and refractory paper or felt is used between the bushing 2 and the mounting frame 13 in a known manner to provide electrical and thermal insulation for the bushing 2 . normally , the tips 14 are arranged in rows down the length of the bushing 2 , but can be in rows running along the width of the bushing 2 as is known . in the bushing shown in fig1 , the tips 14 are arranged in pairs of rows staggered , running along the length of the bushing in a known manner , e . g . as shown in u . s . pat . no . 4 , 337 , 075 . a space is left on the bottom of the orifice plate in between each double row of tips to allow cooling members such as cooling tubes 24 , each having a heat removing fin 26 attached to their top surface . a tremendous amount of heat must be very quickly removed from the molten glass extruding from the tips 14 at temperature over 2000 degrees f . and the cooling tubes 24 with their fins 26 perform this function , supplemented by a flow of air pulled into the area of the tips and fibers by the glass fibers moving rapidly downward , away from the tips 14 . although a cooling tube 14 was removed , in this figure , to better show the double row of tips 14 , it is typical to use a cooling tube 24 having a single fin 26 in the positions just outside the outer row of tips 14 such that each row of tips is adjacent to a fin and cooling tube and adjacent to , but staggered with , another row of tips . the cooling tubes 24 are supported in a known manner , such as disclosed in u . s . pat . no . 5 , 244 , 483 , its disclosure herein incorporated by reference , and by the method shown in fig1 . while the cooling tubes 24 shown here are oval in cross - section , they can be any reasonable shape such as round , square , rectangular with or without radiused ends , etc . as is known . the cooling tubes 24 are supported at each end near each end of the bushing 2 with a crossbar 19 that is held , in an vertically adjustable manner , with a threaded rod 21 that is attached in any reasonable manner to the bottom surface of one of the side rails 15 , typically by being threaded into the side rail 15 and secured from turning by a lock nut 30 . an adjustable stop nut 31 is threaded onto each rod 21 such that the bottom surface of the stop nut 31 serves to position the top surface of the crossbar 19 and the bottom surface of the cooling tubes 24 , hence also a top surface 27 if each cooling fin 26 . the vertical distance between the top surface 27 of the cooling fins 26 and a plane passing along the bottom of the tips 14 is typically in a range of about +/− 0 . 0625 inch . fig1 shows a portion of a mounted bushing 7 ready to be installed beneath a forehearth leg . some of the cooling tubes 24 under the last double row of tips 14 have been left off of this figure to better show the tips 14 and the orifice plate 8 . the bushing 2 , because of its very hot and fairly fragile nature at operating temperature , is surrounded with insulation 4 in a known manner inside a stainless steel mounting frame 13 having side members 15 and cross members 17 . the cooling tubes 24 are held in place near each end of the bushing 2 with a support bar 19 that can be adjusted vertically with corner vertical support assemblies 20 . each corner vertical support assembly 20 comprises a threaded rod 21 , welded to , or screwed into threaded holes in , a lower portion of the side members 15 , a lock nut 30 tightened against the bottom of the side member 15 to lock and support the threaded rod 21 in place , an adjustable stop nut 31 on the threaded rod 21 positioned at a desired level to locate a top 27 of the fins 26 at the desired position with respect to the tips 14 and the orifice plate 8 , and a follower nut 32 to raise a top of the support bar 19 tightly against the adjustable stop nut 31 and to support the bottom of the cross member 19 . this arrangement permits the cooling tubes 24 to be raised or lowered as a group to optimize the cooling of each tip 14 , each hot meniscus below each tip 14 and each fiber being drawn from each meniscus . this adjustment is slow because each corner vertical support 21 must be adjusted and each requires several minutes to adjust by sequentially running the follower nut 32 down each threaded rod 21 a desired amount and then rotating the stop nut 31 down to snug against the top of the cross member 19 . in the prior art , the cooling tubes , fins or other cooling members remained in the adjusted position , keeping the distance between the tops 27 of the fins 26 and the bottom of the tips 14 the same , during both fiberizing and hanging conditions . a cooling fluid , like process water , runs through the cooling tubes 24 to provide cooling to the cooling tubes 24 , with or without the fins 26 . fig2 shows a prior art modification of fig1 having one or more air tube 28 , each having a slot or series of spaced apart holes 29 in the bottom of the air tube 28 , mounted beneath one of the cooling members 24 . when the bushing breaks out the air tube ( s ) is caused to emit a rapidly downward moving stream of air that creates a partial vacuum or low pressure zone in the area immediately beneath the tips 14 . this partial vacuum then induces flows of air from the surroundings into the zone beneath the tips 14 and towards the air tube 28 or below the air tube 28 and finally downward with the primary fibers . conventional air ducts 10 and 11 are mounted on each side of the bushings and direct refrigerated air towards the array of fibers in a conventional manner . the air ducts 10 and 11 can be of various dimensions and at various heights with respect to the bushing , and various distances from the bushings as is well known . fig3 shows the mounted bushing of fig1 , but the cooling hardware has been modified to produce an embodiment of the invention and to permit fast vertical adjustment of all the cooling tubes 24 , typically as a group , with respect to the orifice or tip plate 8 and the bottom of the tips 14 . in this embodiment everything is the same as in the assembly of fig1 except that the vertical support assemblies 20 are replaced with a vertical actuator like an electrical solenoid assembly 34 . the electrical assembly 34 comprises an electrical solenoid 36 attached to the cross member 19 in any suitable manner . the solenoid 36 has a shaft 38 ( fig4 ) that passes through an oversize hole 39 in the cross member 19 and comprises a threaded portion 40 above the cross member 19 . the end of the shaft 38 is attached directly or indirectly to the side rail 15 , such as being screwed into a threaded hole in the side rail 15 as shown in fig4 and 5 . a lock nut 44 tightened against the bottom of the side rail 15 secures the shaft 38 in the side rail 15 . the shaft 38 can be attached to the side rail 15 in other ways such as by welding , press fit , or soldering , etc ., or indirectly by being turned into a nut or other object , attached to the side rail 15 , and having a threaded hole therein . the shaft 38 can optionally have small holes 45 , 47 , typically at 90 degrees from each other for insertion of a rod or similar tool to rotate the shaft 38 when desired . an adjustable stop nut 46 on the threaded portion 40 of the shaft 38 fixes the maximum height that the cross member 15 , and hence the maximum height the tops 27 of the fins 26 on the cooling tubes 24 can reach . the adjustable stop nut 46 , on each of the four solenoid assemblies 34 , is adjusted to locate the tops 27 of the fins 26 with respect to the bottom surface of the orifice plate 8 and the bottoms of the tips 14 during the hanging mode of the bushing 2 . although only one end of the bushing assembly is shown in fig3 , the other end is the same . fig5 shows the fiberizing position of the support member 29 and the cooling members 24 with the fins 26 . in this embodiment the solenoid 36 is energized in the fiberizing mode such that the support member 19 and the cooling members 24 with fins 26 is pulled downward , away from the orifice plate 8 and the tips 14 , to the fiberizing position . when the operator or a sensing device senses that the bushing has broken out , the solenoid 36 , in this embodiment , is de - energized causing the spring 43 to push the support member 19 and cooling members 24 and fins 26 to be moved upwardly , towards the orifice plate 8 and tips 14 , to the hanging position shown in fig4 . the amount of movement of the top 27 of the cooling fins 26 between the operating position of fig5 and the hanging position of fig4 varies with the type and size of the bushing , the type of cooling members being used and the conditions surrounding the orifice plate 8 and the tips 14 , but in the embodiment shown in fig2 - 5 the amount of movement of the top 27 of the cooling fins 26 between the operating position of fig5 and the hanging position of fig4 varies with the type and size of the bushing , the type of cooling members being used and the conditions surrounding the orifice plate 8 and the tips 14 , but in the embodiment shown in fig2 - 5 the distance typically is in the range of about 0 . 01 or 0 . 03 inch to about 0 . 2 inch , more typically about 0 . 04 to about 0 . 45 and most typically about 0 . 06 to about 0 . 37 . the movement of the cooling members is typically limited to less than about 0 . 2 inch and should never get so close to a tip 14 or the orifice plate or tip plate 8 so as to cause an electrical short . fig6 , a cross section of a bushing assembly similar to that shown in fig1 , along lines 6 - 6 , shows a different embodiment of the invention . in this embodiment three conventional spaced apart air tubes 28 are shown along with ceramic supports 25 , sintered mullite or other electrical and glass resistant ceramic , all this being conventional . in the bushing assembly of fig6 , commercially available fogging and / or misters 52 are located in a novel location , either connected to a manifold 50 as shown or spaced apart below the orifice plate 8 and tips 14 and spaced from the outside tips 14 of the bushing 2 . it has been conventional to use water sprays , often called pad or pot sprays , located far below , substantially more than the orifice plate 8 , to spray cooling water into the array of solidified , hot fibers to cool them sufficiently to prevent damage to the chemical sizing conventionally applied to the surface of the fibers still further from the orifice plate 8 . it has not been known to locate foggers and or misters close to the orifice plate 8 and the outside tips 14 down the sides , running along the length of the bushing 2 , and to operate the foggers and / or misters 52 when the bushing is hanging . one or more conventional valves ( not shown ) in the water and / or compressed air line ( s ) supplying the misting and / or foggers 52 , or the manifold 50 , open to cause a fog or mist to be emitted into a region immediately below the tips 14 , near the time when the bushing breaks out , to prevent the orifice plate 8 from over - heating during the hanging mode , and then are closed near the time the bushing is put back into the fiberizing mode . the misting or fogging jets 52 and manifolds 50 , a manifold 50 with a plurality of jets 52 on opposite sides , normally the long side , of the orifice or tip plate 8 of the bushing 2 , can be located at different vertical distances below the bottom of the orifice or tip plate 8 , and at different angles and distances from the centerline of the orifice or tip plate 8 , as shown in fig6 . the manifold can be mounted to be adjustable vertically , laterally , and to rotate sufficiently to point the jets 52 in the desired direction using conventional mounts . the foggers and / or misters are turned on near the time the bushing starts to break out and are turned off near the time that desired fiberization is once again started . by near the time is meant within a period of time ranging from 0 . 001 second to about 2 minutes from the time that the operator notices , or a sensor senses , that the bushing is breaking out , or from before or after the time that the operator starts the strand into a product producing machine such as a winder or a chopper . the fog or mist entering the region immediately beneath the orifice or tip plate , i . e . from about 1 to about 12 inches , more typically from about 2 to about 10 inches , and most typically from about 2 . 5 inches to about 9 inches from the bottom of the tips 14 . the number of jets or nozzles 52 , the distance from the array of fibers and the vertical distance from the bottom of the tips and the total rate of cooling liquid mist or fog sprayed towards the orifice or tip plate 8 and on the array of primary fibers 12 will depend upon the size of the bushing and what other cooling means are being used , but when used , will be determined by the objective of maintaining the molten throughput of the bushing substantially constant during the breakout and hanging mode as it was during desired fiberization periods . the invention also includes a combination of the apparatus for cooling the orifice plate 8 and tips 14 disclosed in fig3 - 6 and such an embodiment is shown in fig7 . this embodiment , particularly when used with one or more air tubes 28 , provides more cooling capability and flexibility of the tips 14 and orifice or tip plate 8 during the hanging mode of the bushing , and permits more optimization of each cooling contributor . this combination of cooling apparatus enhances temperature stability and reduces break rate , breaks per day , on the larger bushings used in the industry , for example bushings having more than 4500 tips and can be needed at times or with different bushing assemblies having fewer than 4500 tips . one can determine whether more or less cooling of the orifice plate 8 and tips 14 is needed on any given bushing assembly by monitoring the magnitude of power the automatic temperature controller for the bushing is applying to the bushing during the fiberizing mode and the hanging mode . the ideal is for this power magnitude to remain constant during both modes and during transition from one mode to the other mode . one can add or remove additional cooling apparatus of the invention , move the cooling members closer or less close to the orifice plate 8 and / or tips 14 , or increase or decrease the flow rate of the cooling liquid , like water , exiting the forgers and / or misters 52 shown in the embodiments of fig6 and 7 to improve the temperature uniformity of the molten material above the orifice plate 8 by monitoring the power load on the bushing and acting in the manner taught by this disclosure to keep the power requirements at as constant a level as possible . different embodiments employing the concept and teachings of the invention will be apparent and obvious to those of ordinary skill in this art and these embodiments are likewise intended to be within the scope of the claims . nor does the inventor intend to abandon or dedicate to others any disclosed inventions that are reasonably disclosed but that do not appear to be literally claimed below , but rather intends those embodiments to be within the scope of the broad claims , either literally or as equivalents to the embodiments that are literally included .