In manufacturing the glass bulb, a type of "ribbon machine" is used. A continuous ribbon of glass is passed along a conveyor belt, heated in a furnace, and then blown by precisely aligned air nozzles through holes in the conveyor belt into molds. Thus the glass bulbs are created. After the bulbs are blown, and cooled, they are cut off the ribbon machine; a typical machine of this sort produces 50,000 bulbs per hour. The filament and its supports are assembled on a glass stem, which is fused to the bulb. The air is pumped out of the bulb, and the evacuation tube in the stem press is sealed by a flame. The bulb is then inserted into the lamp base, and the whole assembly tested. COUNT 5
QSN1 What type of machine manufactures glass light bulbs. ANS1 ribbon machine QSN2 How many bulbs does the average ribbon machine produce per hour? ANS2 50,000 QSN3 How is the filament attached to the bulb? ANS3 assembled on a glass stem, which is fused to the bulb QSN4 How is the evacuation tube sealed? ANS4 by a flame QSN5 What blows the glass bulbs into their characteristic shape? ANS5 precisely aligned air nozzles