X-ray manual - U.S. Army (1917) (14570627959)

Identifier: xraymanualusarmy00unit (find matches)
Title: X-ray manual : U.S. Army
Year: 1917 (1910s)
Authors: United States. Surgeon-General's Office American Roentgen Ray Society
Subjects: X-rays Fractures Teeth Chest Heart Radiography
Publisher: New York : Middleditch
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School



Text Appearing Before Image:
Fig. 3. Current-time curve of a simple A. C. circuit.
Text Appearing After Image:
Fig. 4. Regular gas containing tube.19 20 X-RAY MANUAL—U. S. ARMY The secondary is always: (1) High voltage. (2) Quite small wire. (3) Carries a current of some miili-amperes. (4) Is unpleasant and often dangerous to touch. (5) Will pass across loose connections or even throughsome insulating material. The induction coil and a few transformers have bothcoils wound on hollow concentric cylinders, the primarywithin the secondary, and the space inside the pri-mary coil is filled with thin iron sheets or wires. That isnamed an open magnetic circuit device. Most transformers now in use have the iron in theform of a closed rectangle, and the two coils wound soas to slip on the sides of this rectangle. These areknown as closed magnetic circuit transformers. Thebest practice is to have the coils immersed in a water-free oil, for good insulation. The Gas Tube. While a great variety of special forms of gas contain-ing tubes have been introduced from time to time, thegeneral form shown in Fig.