. The principles and practice of roentgenological technique . Fig. 104.—Reversed polarity. The cathode has be-come the anode. The area of fluorescence isabove and in back of Fig. ids.—Broad focus, high vacuum tube. APPEARANCE OF ACTIVATED GAS TUBE 83 The electrostatic charging of the walls ofthe tube, especially about the cathode resultsin a retention of the gas content but by theheating of the tube this retained gas is re-leased. In a tube normally energized an equil-ibrium is thus maintained and the vacuum re-mains fairly constant. If the current passingthrough the tube—does not hea
. The principles and practice of roentgenological technique . Fig. 104.—Reversed polarity. The cathode has be-come the anode. The area of fluorescence isabove and in back of Fig. ids.—Broad focus, high vacuum tube. APPEARANCE OF ACTIVATED GAS TUBE 83 The electrostatic charging of the walls ofthe tube, especially about the cathode resultsin a retention of the gas content but by theheating of the tube this retained gas is re-leased. In a tube normally energized an equil-ibrium is thus maintained and the vacuum re-mains fairly constant. If the current passingthrough the tube—does not heat the tube, theelectrostatic charging will result in elevationof the vacuum. But if the tube is heavilv The best method of studying the phenomenain an activated tube is to photograph it,by means of a pin hole camera by the lightfurnished by the energized tube itself. Sucha photograph discloses more than is apparentto the eye. There is a division of theglass bulb into two zones, one in front ofthe target, brightly illuminated, and onebehind, which is relatively dark, with theexception of a greater or lesser glow about
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
