Canadian engineer . essaryto strike the arc, the high wattage and the uncertainty ofmaintenance. The bactericidal effect of the ray is due solelyto the radiations themselves and not to any ozone or hyd-rogen dioxide that may be formed, for the production of an appreciable c^uantity of these substances requires severalhours, but the sterilization is instantaneous. Bordier andNogier and other physicists have proved that air exposed tothe radiations of a quartz mercury vapor lamp acquires anodor resembling that of phosphorus, which was at first attri-buted to the production of ozone, but it is im
Canadian engineer . essaryto strike the arc, the high wattage and the uncertainty ofmaintenance. The bactericidal effect of the ray is due solelyto the radiations themselves and not to any ozone or hyd-rogen dioxide that may be formed, for the production of an appreciable c^uantity of these substances requires severalhours, but the sterilization is instantaneous. Bordier andNogier and other physicists have proved that air exposed tothe radiations of a quartz mercury vapor lamp acquires anodor resembling that of phosphorus, which was at first attri-buted to the production of ozone, but it is impossible to de-tect the least trace of ozone in this air, and the same odor isproduced in nitrogen and other gases which contain no oxy-gen. In reality the odor is of physiological or subjectiveorigin, and is due to the excitation of the olfactory nervesby the ionized and electrified air. If the gas is passedthrough a metal tube connected with the ground and thusdeprived of its electrical charge, the odor Fig. 5. New researches by Courmont, Nogier, and Henri con-firm the view that ozone and hjdrogen dioxide play no partin the sterilization produced by these lamps, which is due tothe direct action of the ultra violet rays. Water sterilized bythis process retains its dissolved air, since it has not beenheated. It remains fresh and its flavor is not changed inany way. For municipal water service the sterilization may be ef-fected in the water mains (Fig. 5). In order to avoid break-age of the lamps by the pressure and flow of the water theyare placed outside the mains and their radiations are trans-mitted through windows or bulls eyes of quartz. Some experiments are under way in the City of Torontowith the hyper ultra violet rays. It was originally in-tended to g-enerate this rays from iodine and mercury, butsubsequent investigation and research showed a method oftreating certain common inorganic gases with electric dis-charges in such a manner as to produce a volume o
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
