. Dental materia medica and therapeutics; with special reference to the rational application of remedial measures to dental diseases ... shessufficient caloric rays to readily burn tissue. The projector shouldbe of the parabolic type—that is, so constructed as to furnishparallel rays only. It is claimed that the metal best suited for areflector is an alloy of aluminum and manganese. To modifyor intensify the various rays of this lamp, yellow, blue, or ambercolored glass screens may be clamped to the projector. A freecurrent of air should circulate through the reflector, as this will 430 PHYSIC
. Dental materia medica and therapeutics; with special reference to the rational application of remedial measures to dental diseases ... shessufficient caloric rays to readily burn tissue. The projector shouldbe of the parabolic type—that is, so constructed as to furnishparallel rays only. It is claimed that the metal best suited for areflector is an alloy of aluminum and manganese. To modifyor intensify the various rays of this lamp, yellow, blue, or ambercolored glass screens may be clamped to the projector. A freecurrent of air should circulate through the reflector, as this will 430 PHYSICAL THERAPEUTICS. insure a bright light and prevent ready blistering of the using a high power lamp, a quick-acting switch is necessary,as all other forms of cut-offs readily burn out. * If electricity isnot available, a common coal oil lamp, with a one-half-inch roundburner, provided with a reflector, answers the purpose fairly simple and efficient reflector may be constructed, according toDobrzyniecki,1 as follows: A three-inch convex mirror reflectsthe rays through a plano-concave lens two inches in diameter;. Figure 62. Mode of Application of the Therapeutic Lamp. The therapeutic portable lamp is guidedby the operator. The patient protects himself with an asbestos screen, which has a hole cutnear the center to allow the rays to pass through. the longer end of the cone-shaped connecting tube, being aboutten inches long, is provided at its largest diameter with a three-inch double convex lens; the small end of the tube measuresabout four inches, and has a two-inch double convex lens nearthe outlet. The rays are reflected by the mirror and pass throughthe series of lenses, the last one being brought in close contactwith the patient. 1 Dobrzyniecki: Wiener Zahnarztliche Monatsschrift, 1903, p. 287. HEAT AND COLD. 431 Therapeutic Applications. In the practice of dentistry the mixed rays of light obtainedfrom what is technically known as a one-hundred-candle po
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