Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 580
tion. The anti-cathode is then to directlyfocus the center of the plate. An imaginary line drawn through the anodeand cathode should be parallel to the plate at all times. This rulehas but one exception, and that is, when taking a radiograph of a frontalsinus. In this case the patient should lie… … Fig. 4,696.—Scheidel-Western triple valve tube. The valve tube is used as an accessory tothe X ray coil for eliminating any inverse current. It assists in obtaining greater defini-tion in the radiograph, and by eliminating the heat rays prolongs the life of the X ray tube. 7. The distance of the…
Electrical engineering
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