and, while forty-eight hours is considered This shutter, besides its fireproof qualities, possesses the proper time for furnace coke, the time for foundry thesteam, after passing through one wheel, acts directly on the second wheel. coke is tixed at seventy-two hours. The consequence To cut off the… … As to the saving of ordinary bee-hive oven coke over anthracite coal, I have the figures of a large foundry- man. In substance they state that, for a day’s work channels and vanes, the ring-valve having ports cor- the merit of being lighter than a wooden shutter. By in his foundry, under…
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