. Principles of electro-medicine, electrosurgery and radiology : a practical treatise for students and practitioners. With chapters on mechanical vibration and blood pressure technique . F^ig. 34—500 candle powertherapeutic lamp. Electro-Medicine, Electro-Surgery and Radiology 91 considerably reduces the amount of heat—that is to say, it effectivelycuts off a good proportion of the heat rays, but does not affect the chem-ical rays. The yellow crystal (Bordier tints 2 and 3, especially 2) have a greattransparency for the actinic rays, but very dark yellow^ (Bordier tint 4)cuts off nearly all th
. Principles of electro-medicine, electrosurgery and radiology : a practical treatise for students and practitioners. With chapters on mechanical vibration and blood pressure technique . F^ig. 34—500 candle powertherapeutic lamp. Electro-Medicine, Electro-Surgery and Radiology 91 considerably reduces the amount of heat—that is to say, it effectivelycuts off a good proportion of the heat rays, but does not affect the chem-ical rays. The yellow crystal (Bordier tints 2 and 3, especially 2) have a greattransparency for the actinic rays, but very dark yellow^ (Bordier tint 4)cuts off nearly all the actinic rays. Green crystal, Bordier tint 2, allows some actinic rays to pass, whereastints 4 and 5 arrest all the actinic rays. Frosted glass allows chiefly the heat rays of the spectrum, becausethe actinic rays are unable to pass through such a glass. The colored screens or lamps employed to cut off certain rays fortherapeutic purposes must be of colored crystal through and through,as painted screens or lamps are useless, since they keep back the essen-tial Fig. 35- -Therapeutic Lamp suspended on awall bracket. Photo-therapy Incandescent Light The light from an incandescent lamp contains a large percentage ofthe red and yellow rays. The actinic rays, especially the ultra-violet,being almost entirely cut off by the enclosing bulb, the treatment bymeans of an incandescent light is largely a radiant light and heat treat-ment. The treatment by incandescent lamps is manifestly inferior to a treat-ment which utilizes the whole spectrum, as does sunlight, but it is ofgreat value in cases where the thermic effects are more essential thanthe effects of the chemical rays. Due to the penetration of the heat rays,it is far superior to other heating methods (except diathermy). The incandescent light treatments arc administered in the form ofan electric light bath, therapeutic lamp, or other appliances for the local 92 Anthony Matijaca treatment of arms, legs, trunk, etc., and
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