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

THE EVAPORATOR. IO/ for regulating the feed, altering the feed-cock by guess- work till he gets a strength of brine that he considers shows a proper amount of feed. This method has the advantage of being simple, but such a system of regulating the feed is somewhat risky. The amount of feed supplied is pure guess work, and should he leave his work, for only a short period of time, he may return to find his evaporator either filled with water, or the feed supply so insufficient that the evaporator is salted up, and practically useless, until it is opened out and cleaned. / 89. A description of the salinometer and the mode of using it are as follows :— The salinometer is a small float, made either of metal or glass, so weighted that / it sinks to varying depths when placed in liquids of different densities. Fig. 10 / n0uow \ shows an ordinary salinometer, 8 to 10 I Sphere j inches long. The central bulb is hollow, J so as to make the instrument buoyant, and the small bulb at the bottom (W) is an adjusted weight, or poise, so that when the salinometer is placed in the saline liquid to be tested, it will sink deeply if the density is slight, but less so when the density or specific gravity of the liquid increases. The figures 1, 2, 3, 4, placed on the upper stem are intended to denote 3V,-g-g, By putting the salinometer in brine drawn from the test cock, if its salinity is the salinometer will sink down to the figure 3 on its stem. The brine to be tested must be at the temperature of 200°, which experience shows to be the most con- venient. If this temperature is not kept to, the strength