Canadian engineer . of 25,000 crowns (about January ii, 1912. THE CANADIAN ENGINEER 131 $6,700) in return for the free treatment of poor lupuspatients. Within the last few years many arc lamps with metallicelectrodes have been invented, which emit a far larger pro-portion of violet and ultra violet rays than the ordinary car-bon arc lamp produces, chief among which is the mercuryvapor lamp. The Kromayer lamp, which is a modification of theCouper-Hewitt lamp and finds considerable employment inlight treatment of disease, contains a tube of fused quartz,two-thirds of an inch in diameter, having
Canadian engineer . of 25,000 crowns (about January ii, 1912. THE CANADIAN ENGINEER 131 $6,700) in return for the free treatment of poor lupuspatients. Within the last few years many arc lamps with metallicelectrodes have been invented, which emit a far larger pro-portion of violet and ultra violet rays than the ordinary car-bon arc lamp produces, chief among which is the mercuryvapor lamp. The Kromayer lamp, which is a modification of theCouper-Hewitt lamp and finds considerable employment inlight treatment of disease, contains a tube of fused quartz,two-thirds of an inch in diameter, having the form of an in-verted V. The air is completely removed from the tube, theends of which form mercury cups, which constitute theelectrodes and are connected to the lighting wires. Thisluminous tube is inclosed in a globe, which is also made offused quartz, and the globe is inclosed in a water-tight caseof nickled brass, provided with a quartz window, which canbe pressed directly against the skin of the patient. The. Fig. 3. space between the quartz globe and its metal case is filledwith cold water, which enters continuously through a tubeat ^he bottom of the case and flows out through a Lube atthe top. The is ignited by tipping it and thus causinga thin stream of mercury to flow along the tube and estab-lish connection between the electrodes. When the lamp isrighted and the thread of mercury is broken a powerfulluminous arc is formed in the mercury vapor which fills thetube. Local treatment, with or without pressure, can be ap-plied very conveniently with this lamp, but great care mustbe taken to avoid burning the skin. This treatment isefficacious in all forms of eczema, carbuncles and ulcers ofthe legs and various parts of the skin and mucous mem-branes, but especially in wet eczema and in circular bald-ness. Treatment with pressure is employed especially inlupus and burns. When science had demonstrated her ability to cope withthe diseases of men through these mystic r
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