i8o DYEING AND CALICO PRINTING.

Fig. 15.

1. Elevation of complete apparatus. 2, Section.

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a a. Body of retort, b b. Head of retort, c. Axle of agitator, made hollow so as toconduct steam to the bottom of the apparatus. e. Entrance for steam. f. Man-hole. g g. Openings for taking out the colour. h h. Cavities in which hot aircirculates, and which can be opened if it is required to cool the apparatus.

Fig. 16.

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hour, the vent-holes are opened, and the contents run into cisterns fitted withagitators through sheet-iron pipes (Fig. 16). Here the mass is treated withboiling water, in the proportion of 300 kilos, of crude magenta to 1500 litresof water, acidulated with 3 kilos, of hydrochloric acid. Ebullition is kept upby means of steam-pipes. In four or five hours the solution is complete.