Light Pipes (Dec, 1947)

Light Pipes

GLASS tubing—eight hundred miles of it each month—flows from the nose of the 100-ton mandrel furnace at right. Cut into five-foot lengths for 100-watt fluorescent lamps, the tubes are first thoroughly cleaned inside and out with the combination brush and suction cleaner shown above. Then each one is filled to the top with fluorescent powders called phosphors. The liquid drains out leaving a phosphor coating inside and the long bulbs are placed on the rack at left to dry. Above, the furnaceman inspects tubing as it emerges

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