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

28 SEA WATER DISTILLATION. in 32 parts. A salinometer, in short, is an instrument for measuring the “ salinity ” of sea water or brine. It will also record the “ density ” of the sea water or brine ; but this is a different thing from “ salinity,” and the figures that record the latter will not be the same as will record the former. cannot be either the “ density ” or the “ specific gravity ” ; it is the “ salinity.” Other Properties of Sea Water. 18. Sea water has a rather higher boiling point than ordinary fresh water, which is 212° F. Sea water boils at about 213° F. But, for ordinary purposes, in a prac- tical treatise of the present description, 212° may be assumed to be the boiling point of sea water. 19. As there are various slight differences between sea water and fresh water, Tables C and D have been added, giving many useful notes concerning water generally. (6) Inland Seas. 20. Up to the present we have been dealing with ocean water, which we find is practically the same all over the world, and whatever difference there is, is really due to climatic influences. But in different parts of the world there are large areas of water, away from the ocean, such as inland or land- locked seas, lakes, river-mouths, &c., whose salinity is different from that of the ocean. Thus the Mediterranean, practically a huge lake, whose water is altogether unlike that of the ocean in appearance, has a salinity of 4 per cent.—i.e., somewhat salter than the ocean. Then take the Red Sea, another large land-locked sea, having a salinity of 4 per cent. These two seas are almost com- pletely shut in, and have a salinity of 4 per cent., whilst