iling water or steam; but the injurious effects above de- ties of wool which have been ruined by the pitch employed scribed invariably followed. Mr. Moison discovered at length that with proper arrangements a current of air heated to a temperature considerably below that of boiling water, 70° or… … the dust and clean away the old oil. This opera- terial is reduced in advance to about one half its tion is completed in a few minutes, after which the move- original volume. ment is exposed to air heated to a temperature a little above The lid is secured air tight by means of bolts and screws,…
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