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

APPENDICES. 229 (Appendix to page 113.) The feed, evaporation, and brine all hang together very closely; the distilled water being evaporated from the feed and the brine being what is afterwards left. Both the distilled water and the brine, therefore, offer them- selves as agents for regulating the feed as to its quantity. Fig. 12 shows how the output of distilled water may be applied to this use. It has the following points which make it preferable to using brine for this purpose, viz.:—It is cold, or cooler than the brine, and it is also fresh, and therefore free from a disposition to cause incrustation on the float and other parts with which it comes into contact. If it becomes difficult to pass the distilled water into the feed regulator the brine has to be used, and, if due provision is made for the heat and impurity of the brine, a regulator somewhat on the same lines as shown in Fig. 12 can be adapted to the use of brine instead of the distilled water. When, however, the brine is to be used in the feed regulator, it must be kept in view that (with a constant feed) the discharge of brine increases as the output of distilled water decreases. Therefore, the function of the brine in the regulator would be to shorten the feed supply as the brine tends to be excessive. The feed, evaporation, and brine will then all three be constantly kept in due proportion to one another. (Appendix to page 161.) The “Normandy” Double Distiller, shown in Fig. 20 (p. 161), has its evaporator coils designed to meet all the requirements detailed on p. 89 (sec. 48), as far as pos- sible. Fig. 16 on. p. 134 shows the evaporator with door off, and coils exposed to view.