A patent of May 26, 1885, by R. d'Heureuse of New York, is for the use of water from which by aeration deleterions organic impurities are removed before the water is brought in contact with substances employed in the various industries.

The aeration is accomplished by impregnating the water with oxygen of the air, which effects an oxidation of the objectionable nitrogenous contaminations, otherwise the fruitful source of injury to the products or to the health of their consumers.

The operation of this aeration is performed by forcing air or oxygen, preferably minutely divided, into the water, be the same in open tanks or in closed vessels in which an increased pressure can be produced; or by forcing the air into the water main along with the water.

If filtration of the water becomes necessary the last above-mentioned method of aeration, previous to the passage of the water through the filter, is generally the most preferable.

Suitable air compressors, air conduit, and injecting appliances are required for the performance of the operation, which proves itself highly effectual while exceedingly simple, inexpensive and free from any possibility of doing harm.

The annexed illustrations show diagrams of appliances for aerating the water, in open tank, in closed tank under increased pressure, and in forcing the air into the water main, which conducts both together to a filter. We understand that the patent is not confined to any special mode or apparatus to aerate the water.

Fig. 6.   Aeration in open Tank

Fig. 6. - Aeration in open Tank.

Fig. 7.   Aeration in closed Tank

Fig. 7. - Aeration in closed Tank.

Fig. 8.   Aeration combined with Filtration

Fig. 8. - Aeration combined with Filtration.

In conclusion we might say, that the principal question in aerating water is the selection of some appliance to effect it thoroughly, continuously and economically. Pumps, engines and devices of many kinds have been constructed for the express purpose of charging water with atmospheric air. Some are failures, others are more successful than economical, and still others balance these two requirements very happily, but all are not alike applicable to water-purifying systems that have the two other essential features, and are incomplete by themselves. The most desirable aeration is that which charges the water with air under pressure. The proportion of oxygen absorbed is then very largely increased, and oxygen is the very element desired. It burns up impurities, defertilizes germs, destroys bad odors, regenerates the water itself and gives it such a clear, sparkling appearance that we call it "living water" Whenever water is exhausted of oxygen it becomes stagnant, flat, miasmatic, the breeding-place of myriads of germs, animalcules, confervae, rotiferae and the whole list of four-syllabled creatures that are not wanted in drinking water. By some appliances for aeration the water is so thoroughly charged with air that when released from pressure it effervesces like the best carbonated waters, and sparkles as if filled with myriads of jewels.