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"Here are the furnaces," the foreman said. "Each one has twelve openings and is built with a low dome to keep in the heat. The flues or chimneys are in the sides of the furnace. Within, and just beneath the openings or working-holes, stand the great clay pots of molten batch.
He now led them up to where a gatherer stood at one of the working-holes of the furnace. "This man," explained Mr. Wyman, "is collecting on his blow-pipe enough glass to make a pitcher. He uses his judgment as to the amount necessary, but so often has he estimated it that he seldom gets either too much or too little.
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