. Hand-book of electro-therapeutics . d at the same time, by means of pressure,removed from the injured part as much blood as knew that blood prevents the passage of the actinic raysto the tissues. At the present time there are on the market different makesof lamps which are patterned after the original Finsen apparatus consists of the light, the cooling apparatus, andthe light-concentrating apparatus. It has been learned that the composition of the electrodeshas much to do with the quantity of ultra-violet rays. Thereis now on the market a lamp in which iron electrode
. Hand-book of electro-therapeutics . d at the same time, by means of pressure,removed from the injured part as much blood as knew that blood prevents the passage of the actinic raysto the tissues. At the present time there are on the market different makesof lamps which are patterned after the original Finsen apparatus consists of the light, the cooling apparatus, andthe light-concentrating apparatus. It has been learned that the composition of the electrodeshas much to do with the quantity of ultra-violet rays. Thereis now on the market a lamp in which iron electrodes, cooledby water, are used. These lamps give a large quantity of actinicrays with but a small amount of heat. They should be used only 184 ELECTRO-THERAPEUTICS. ill the treatment of superficial troubles, as the actinic rays arenot penetrative in character. The electric arc is the best means for producing the so-called Finsen rays. The combination of iron in the electric arcproduces these rays in the greatest volume. Finsen concluded. i^ig. SS.—Aiodeni JNlediciiie lamp. that the germicidal power of light lies in the ultra-violetrays almost entirely. Later investigators have verified hisconclusions. The lamp described in this book is known as the SolarTherapeutic Arc Lamp, made by the Modern Medicine Co., ofBattle Creek, Michigan. LIGHT AND HEAT THEEAPY. 185
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