. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent; designed for the use of practitioners and students . tic. Form of : Thomson Dynamo Static. 2. Induction Coil; the two types of which are a. Ordinary Page, or Ruhmkorff, coil. b. Tesla, or high frequency coil. Form of : Thomson coil. 1. Static Machine. — The static machine may be driven by hand, or byany form of motor such as an electric or water motor, or a gas engine;and may be self-exciting or be excited by a small Toepler-Holtz orWimshurst machine. 2. Induction Coil. — The electric current for the
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent; designed for the use of practitioners and students . tic. Form of : Thomson Dynamo Static. 2. Induction Coil; the two types of which are a. Ordinary Page, or Ruhmkorff, coil. b. Tesla, or high frequency coil. Form of : Thomson coil. 1. Static Machine. — The static machine may be driven by hand, or byany form of motor such as an electric or water motor, or a gas engine;and may be self-exciting or be excited by a small Toepler-Holtz orWimshurst machine. 2. Induction Coil. — The electric current for the induction coil may beobtained from a. Primary battery (low voltage). b. Storage battery (low voltage): 1. Charged by gravity cells; 2. Charged from street main. c. A dynamo which generates a continuous or alternating current of either high or low voltage. d. The street main (high voltage); current continuous or alter- nating. 8 X-RAY EQUIPMENT Static Machine In discussing this type of machine I will describe the one which I hadmade and have used in my work at the Boston City Hospital. In de-signing it I studied simplicity and lO THE ROENTGEN RAYS IN MEDICINE AND SURGERY My machine is of the Holtz form and has four revolving plate-glassplates 183 centimetres (6 feet) iru diameter, and four fixed plate-glassplates 193 centimetres(6 feet 4 inches) in diameter. These eight platesweigh about 1000 pounds. The plates of a static machine may bemade of glass, hard rubber, or mica, but glass is the best material. The machine, for the purpose of insulation, rests on eight or ten glassblocks 15 X 20 centimetres and 3 centimetres or more thick, so placedas to bear its weight most advantageously. It is run by a one horse-power electric motor. When a static machine is properly constructed it never reverses whilein action. The static machine is given its initial charge by an auxiliarymachine of the Wimshurst type with plates centimetres (16inches) in diameter. When it is
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