variability makes careful examina- BY FRANCIS H. WILLIAMS, M.D., BOSTON. There are many forms of apparatus for exciting tions with the fluorescent screen impossible. The long spark gap is also noisy. To overcome the lack of stead- vacuum tubes to generate X-rays, and doubtless we iness in the… … Fig. 1.—DETAILS OF ADJUSTABLE MULTIPLE the machine, and by this device the Crookes tube is nearer together. The condensers are covered on the SPARK-GAP. outside on the bottom only. thrown in or out of the circuit and shuts off as soon as the examination is over. The tube should be about The machine…
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