The practical papermaker : a complete guide to the manufacture of paper / by James Dunbar.

  • Dunbar, James.
Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: The practical papermaker : a complete guide to the manufacture of paper / by James Dunbar. Source: Wellcome Collection.

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    centre; raise it upon a stand 3 feet high; fit into it two frames or screens, which can be easily removed when desired; work across this frame a network of white cord or twine of sufficient strength to support a weight of 200 lbs., and have it sufficiently close to prevent the soda falling through the meshes. Upon each of these screens put 200 lb. of the ordinary crystal soda of commerce, then put on the lid or cover, and clay it round perfectly tight. Make two or three small air holes in the clay, or have an air- cock attached to the cover underneath the screens, and attached to the cask a pipe connected to a re¬ tort, into which put 9 lb. of sulphur. Start a fire below the retort, and, when the sulphur begins to melt, heat a piece of iron rod to a red heat, and insert it into the sulphur, which will commence to burn and send its fumes through this pipe into the cask, passing through the crystal soda, converting it into antichlorine. When this 9 lb. of sulphur is all consumed, the operation must be repeated, using again 9 lb. of sulphur. Proportions :—400 lb. of crystal soda and 18 lb. of sulphur. Dissolve the antichlorine in the cask, and bottle it off into carboys, and convey it to the beating engine department. BLEACH TEST. Mix \ oz. of starch into a paste with cold water, then add boiling water until it amounts to one pint, adding two drachms of iodide of potassium; when cold it is ready for use. Drop a few drops upon a handful of stuff: if any chlorine is present, it will immediately turn black; if none, it will remain un¬ changed.