. The principles and practice of roentgenological technique . Fig. 102.—Broad focus, medium vacuum tube. Thebright point below the bright area on the targetis a reflected image of the focal point. Other factors may be the driving of the gasinto the glass by the discharge, and the chem-ical action between gas and Fig. 103.—Fine focus, high vacuum tube.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920