A Practical Manual On Sea Water Distillation
With A Description Of The Necessary Machinery For The Process

MULTIPLE DISTILLATION. 2II can be made of cast iron, or they can be made much in the same way as the distiller covers are made—i.e., of a thin sheet of copper gripped between the flange of the casing and a ring outside (see Fig. 13, p. 116 and Fig. 14, p. 118). (e) THE FEED REGULATOR. 92. The operation of the feed regulator for regulating the feed of the evaporator in a double distilling apparatus has already been explained in p. 113. In that case the only feed-water regulated was that of the evaporator. By the automatic action of balance floats, the evaporator feed-water was regulated so as to be constantly kept in due proportion to the production of the gained distilled water, thus causing the brine of the evaporator to be kept at a uniform salinity, whatever may be the rate of pro- duction of the distilled water. 93. The feed regulator suitable for multiple distillation is merely an extension of this principle. Thus, in mul- tiple distillation, not one, but two or more evaporators have to be fed in due proportion to their respective evaporations; and the boiler also can be fed in this manner with sea water without any trouble, so as to keep the brine salinity invariable. 94. In the double distiller feed regulator (see Fig. 12, p. 113) the balance floats regulate the feed for one evap- orator only. Fig. 23 shows that the sea water entering at (SW) into the compartment may be controlled by the float (S), so as to be equal to the total feed-water of the boiler and all the evaporators collectively. When this has been regulated by the action of the two floats (S) and (F), the sea water, from the box with (S) float, can be run out into channel (C), and from this channel it may