. Röntgen ray diagnosis and therapy . Fig. 8—Regulating Tube. tubes that show fluorescence only when a high current is usedshould be rejected. It is one of the main characteristics of a goodtube that it stands intense glowing of the platinum disk without. Fig. 9.—Regulating Tube in Use. THE APPAKATUS 21 being impaired after a few seconds; in other words, thai it standscurrents of high intensity. A good tube must also furnish a uni-form light. The variety of tubes now manufactured in various parts of theworld is very great. It seems to the writer that, while the best coilsare made in this count
. Röntgen ray diagnosis and therapy . Fig. 8—Regulating Tube. tubes that show fluorescence only when a high current is usedshould be rejected. It is one of the main characteristics of a goodtube that it stands intense glowing of the platinum disk without. Fig. 9.—Regulating Tube in Use. THE APPAKATUS 21 being impaired after a few seconds; in other words, thai it standscurrents of high intensity. A good tube must also furnish a uni-form light. The variety of tubes now manufactured in various parts of theworld is very great. It seems to the writer that, while the best coilsare made in this country, Germany still furnishes the best must also be considered that it requires a vast amount of expe-rience and repeated experimentation to select tubes suitable forthe particular apparatus employed. Static machines, as alludedto before, require tubes with a special vacuum, while tubes pre-pared for a battery set generally do not give satisfaction with anair-brake wheel apparatus or a Wehnelt interrupter, which per-
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