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

MULTIPLE DISTILLATION. 2 I 9 apparatus to settle down properly to work, and all parts to be heated properly. As soon as this happens, the trial may be commenced against weighed coals, or such other fuel as is specified. (7 ) In recording the production, it may here again be repeated that the production of the apparatus in point of time is a totally different thing from the production as regards consumption of fuel. An apparatus may be capable of producing quantities having a very wide range in point of time, and yet all may practically be equally economical. On the other hand, several types of apparatus may all be capable of practically the same output of water, in point of time, yet be immensely different in their rate of economy. 113) Fig. 25 shows the important parts of a treble dis- tillation apparatus. The boiler, the pump, the automatic feed regulator, and the filter are shown elsewhere. The following parts (some at the back of the apparatus not visible) may be indicated as follows :— B, Steam pipe from the boiler. C, Steam pipe leading to the pump. D, Steam valve for letting the primary steam into the first evaporator. E, Secondary steam from first evaporator shell to second evaporator coils. F, Feed pipe from heater to first evaporator. G, Tertiary steam from second evaporator shell to all three feed-water heaters. H, Feed-water pipe from heater to second evaporator. I, Tertiary steam (uncondensed by heaters) and the condensed steam from coil drains to distiller.