. 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 . into an insulated handle, in contact with one of the wires con-necting the static machine with the wire of the vacuum tube, andapproaches the other end toward the second wire connecting the staticmachine with the other wire of the tube. A point is thus soon foundat which the current prefers to go from the static machine wire, throughthe rod, and then jump across more or less air space to the other staticmachine wire at B, rather than go through th
. 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 . into an insulated handle, in contact with one of the wires con-necting the static machine with the wire of the vacuum tube, andapproaches the other end toward the second wire connecting the staticmachine with the other wire of the tube. A point is thus soon foundat which the current prefers to go from the static machine wire, throughthe rod, and then jump across more or less air space to the other staticmachine wire at B, rather than go through the tube. If the resistanceis high the current will jump across 20 or more centimetres rather than 1 Rollins has discussed this and other important points relating to tubes, in articles pub-lished in the Electrical Review, during 1S97-1S9S-1S99-1900. X-RAY EQUIPMENT 43 go through the tube. If, on the other hand, it is low, the current willgo through the tube rather than jump an air space of a millimetre orless. The amount of obstacle to the passage of the current, then, may-be indicated by saying that the tube has a resistance of so and so many. Fig. 37. Cut showing method of determining the resistance of the tube. The current jumps across the air space at B rather than go through the tube. When the resist-ance of the tube is low, the current will pass through the tube even when the distance at /? is a milli-metre or less. When it is high it will jump across tlie air space, at B, even when the distance is13 centimetres (about 5 inches) or more. centimetres or millimetres. This means of measurement is equallyapplicable to a coil, but is carried out a little differently; the twoterminals of the coil take the place of the two wires connecting thestatic machine with the tube, and the rod may be straight instead ofcurved. 44 THE ROENTGEN RAYS IN MEDICINE AND SURGERY Methods for changing Resistance Low Resistance. — If the resistance becomes much too low it is bestto send the tube ba
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