The synthetic dyestuffs and the intermediate products from which they are derived (1920)
Cain, John Cannell, 1871-1921, Thorpe, Jocelyn Field, 1872- · London : C. Griffin · leaf 236
the nuts half or once round in rotation till they are allquite tight. If one is screwed tightly before the others, leakage may occur, or anut may slip from its place. The lid of the autoclave is supplied with a pressure-gauge and a ther-mometer-pipe. A little oil is placed in the latter before… … Fig. 3. The vessel is heated either by the direct flame or in an oil-bath. In thelatter case the bath is usually a part of the apparatus. When the direct flameis used, great care must be taken to raise the temperature very slowly to therequired point, and the autoclave must not be opened till it is…
Dyes and dyeing
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