Hummel, J. J. (John James), -1902, Foster, A. R, Hasluck, Paul N. (Paul Nooncree), 1854-1931 · Philadelphia : David McKay · leaf 20
al arrangement is that in which the vat is made of wood, and heated internally by a copper steam-pipe forming a spiral half-way up the walls of the vat. When not in use for dyeing, and to prevent loss of heat and oxidation of the reduced indigo, the vat is covered with a wooden lid, which is… … Fig. 3. — Indigo Vat. a vat for woollen dyeing, the following vats may be distin- guished : Woad, potash, soda, urine, and hydrosulphite. Woad Vat.— In setting this vat the following substances are employed for a vessel of the dimensions already given : rrr £3-0 lb. kilos. 15 == 6G1-3 „ Woad . 300…
Dyes and dyeing · Coloring matter
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