The synthetic dyestuffs : and the intermediate products from which they are derived (1905)
Cain, John Cannell, 1871-1921, Thorpe, Jocelyn Field, 1872-1940 · London : C. Griffen and Co. · leaf 202
rom 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 introducing the ther-mometer. Observations of both temperature and pressure are usually made inheating the autoclave; indications of the pressure-gauge, for… … W Fig. 3. is 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 quite cold. Work With fuming Sulphuric acid.—Fuming sulphuric acid is usedvery largely technically for the preparation of polysulphonic acids, etc.;…
Dyes and dyeing
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