Journal . s metaldraws the tube down till it falls off. Immediately the operatorpicks up the bulb and blows out the molten end into a smallthin bulb which is immediately fractured, thus giving a bell-mouth to the bulb stem. This bell-mouth, in addition to SOME MODERN ENGINEERING PRACTICE IN AMERICA. 43 being truly central, permits an entry for the flange on the glassstem carrying the elements, which stem is immediately fusedinto the bulb on a special form of lamp machine with fourheads. Fusing in the Elements.—(Fig. 5.) The four-headed machinehas three of its heads provided, at the stopping po
Journal . s metaldraws the tube down till it falls off. Immediately the operatorpicks up the bulb and blows out the molten end into a smallthin bulb which is immediately fractured, thus giving a bell-mouth to the bulb stem. This bell-mouth, in addition to SOME MODERN ENGINEERING PRACTICE IN AMERICA. 43 being truly central, permits an entry for the flange on the glassstem carrying the elements, which stem is immediately fusedinto the bulb on a special form of lamp machine with fourheads. Fusing in the Elements.—(Fig. 5.) The four-headed machinehas three of its heads provided, at the stopping points,with rings of gas flames turned to different heights, thefirst giving a gentle heat, the intensity of the heat increas-ing up to the third position where the actual fusion machine is loaded by placing a glass stem carryingthe elements into the carrier with the elements the top of this, the glass globe is fitted, also in acarrier, so that the globe and the elements rotate when. Fig. 5. Glass Fusing Machines in* Foreground. Evacuating Ovensin Background. the machine passes to the positions where the flamesoccur. This rotation is caused by friction wheels which comeinto contact with the carrier as soon as it reaches one of thestopping points where the flames are located. Immediatelyfusion occurs, the valve is taken from the carrier and centralizedwith a stick placed up the stem where the wires go must be noted that the wire carrying stem is placed on thecarrier by first threading the wires downwards through, a holeprovided for the purpose. 44 SOME MODERN ENGINEERING PRACTICE IN AMERICA. Construction of the Elements. Sealing in the Wires.—-The four wires are sealed into theglass stems in a somewhat similar machine; the four wireshaving previously been fanned by hand and placed within theglass tube with the nickel ends upwards and located against agauge point so that the platinum in each wire will come inline and at the proper position in
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Keywords: ., bookcentury1800, bookdecade186, bookpublisherlondon, bookyear1861
