. Principles of electro-medicine, electro-surgery and radiology : a practical treatise for students and practioners, with chapters on mechanical vibration and blood pressure technique . t when applying thistreatment near the eyes, the patients sight must be protected by darkgreen (Bordier tint 4) spectacles, or by covering the eyes with a doublefold of brown or red paper. For the same reason, it is advisable thatthe operator, when administering this or any other actinic treatment,protect his own sight by wearing dark green spectacles. If the patient complains that the rays produce a burning se
. Principles of electro-medicine, electro-surgery and radiology : a practical treatise for students and practioners, with chapters on mechanical vibration and blood pressure technique . t when applying thistreatment near the eyes, the patients sight must be protected by darkgreen (Bordier tint 4) spectacles, or by covering the eyes with a doublefold of brown or red paper. For the same reason, it is advisable thatthe operator, when administering this or any other actinic treatment,protect his own sight by wearing dark green spectacles. If the patient complains that the rays produce a burning sensation, itmeans that the pressure-lens is applied too gently. In order to prevent spreading of infection, the pressure-lens mustbe sterilized after each treatment. Electro-Medicine, Electro-Surgery and Radiology 103 CHAPTER XIV ROENTGEN OR X-RAYS THE Roentgen, or X-rays, discovered in 1895 by Dr. William ConradRoentgen of Berlin, possess the property of penetrating supposedlyopaque bodies, but cannot be seen or felt as they pass throughthe rays are composed of considerably shorter waves than theshortest ultra-violet rays of light, representing a rate of frequency ap-. Fig. 52—Diagram of an X-ray tube. proximately one thousand times greater than the higher frequencies ofthe visible spectrum. They are produced by means of an X-ray tubeexcited by an induction coil, interrupterless transformer, high fre-quency apparatus, or a static machine. The X-ray Tube The modern X-ray tube (Fig. 52) is a large glass bulb, varying from(i to 8 inches in diameter (out of which lead two, three or more shortglass stems) exhausted to a vacuum from 7100000 (one hundred thou-sandth) to 710ooooo (°ne millionth) of an atmosphere. It consists of var-ious parts, most important being the cathode, anti-cathode or anode, bi-anode and a regulator. The Cathode (1) is a concave platinum disc, which serves to project astream of electrified particles upon a focus point or a target (18). 104 Anthony
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