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The Mather Kier, cross section

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In the modern processes of bleaching cotton pieces the lime boil is entirely dispensed with, its place being taken by a treatment in the kier with caustic soda (or a mixture of caustic soda and soda ash) and resin soap. The best known and probably the most widely practised of these processes is one which was worked out by the late M. Horace Koechlin in conjunction with Sir William Mather, and this differs from the old process not only in the sequence of the operations but also in the construction of the kier. This consists of a horizontal egg-ended cylinder.

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The Project Gutenberg EBook of Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1, by Various
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