. The principles and practice of roentgenological technique . Coolidge tube. Other ways of diminishingthese aberrant rays are: 1. By a hood over the anticathode. 2. By the use of a tungsten button set incopper. 3. Placing the anticathode at right angles tothe long axis of the Fig. 117.—Metallic Iris diaphragm. A simple method of testing the size andmobility of the focus is by the use of a pieceof wire netting of one centimeter mesh heldequidistant (eight inches) from the target andfrom the recording surface. The sharp-ness of the resulting shadows will indicate thecondition of the focal
. The principles and practice of roentgenological technique . Coolidge tube. Other ways of diminishingthese aberrant rays are: 1. By a hood over the anticathode. 2. By the use of a tungsten button set incopper. 3. Placing the anticathode at right angles tothe long axis of the Fig. 117.—Metallic Iris diaphragm. A simple method of testing the size andmobility of the focus is by the use of a pieceof wire netting of one centimeter mesh heldequidistant (eight inches) from the target andfrom the recording surface. The sharp-ness of the resulting shadows will indicate thecondition of the focal point. (Figs. 114-115).The focal spot itself may be studied radio-graphically by a pin hole opening in a leadplate, placed equidistant from tube and photo-graphic plate.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
