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The adapter described here fits on the tube holder as does a therapy cone used to confine the rays to small areas. It is a steel plate, through the center of which there fits a telescope arrangement made of a brass sleeve and a steel shaft graduated in inches or centimeters. At the end of the shaft an ebonite knob is attached. A tension spring is placed within the shaft to hold the graduated bar within any set point in the sleeve. The entire adapter, except the knob, is nickel or chrome plated. The brass sleeve can be made so that when the shaft is entirely within the sleeve, it will measure 8 inches (20.3 cm.), or preferably a little less, from the center of the anode to the bottom of the ebonite knob. If one wishes to use various distances the telescope can be made detachable by means of
Friedman HL. A CENTERING AND MEASURING DEVICE FOR ROENTGEN THERAPY. Arch Derm Syphilol. 1934;30(4):570–571. doi:10.1001/archderm.1934.01460160084012
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