Vacuum Boiler, Testing the Liquid (Glue)
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This illustration shows a vacuum boiler in which liquid to become glue is boiled by steam, as well as a man testing the liquid in the manufacturing process.
Source
John H. Finley ed. Nelson's Perpetual Loose-Leaf Encyclopaedia (vol. 5) (New York, NY: Thomas Nelson and Sons, 1917) 464
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