Fig. 17.

/

l

Mi

111

i, 2, 3. Elevation, profile, and ground plan of the entire apparatus. 4. Sedtion of a filter.

5, 6. Elevation and sedtion profile of one end of the extraaion-boiler.

Boiler containing crude magenta melt and water, which are heated to about I 3 °° C-(pressure about 2 atmospheres). b. Spiral agitator. c. Filter working upwards, underpressure from the boiler. d. Valve for opening or shutting communication between theboiler and the filter, e. Tube conduaing the liquid at will into the vats, f,g,h. These areplaced at different heights. In / a part of the colour is deposited ; a further portion settlesin g, and almost the whole remainder in the crystalliser, h , whence the liquid flows into thewell, t, from which it is drawn up by the pump,./, for a new operation.