Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 48
-gives these pointers the very apt name of materialised rays,because they are used to trace out the paths of special rays.The name would apply just as well to the silk threads of theDavidson localiser. On page 124 et seq. descriptions are given of both theseinstruments, and on page 142 various… … Plate II.—Needle in Foot. THE DISCOVEBY. 21 While this development was approaching its present per-fection, other workers were trying to discover the action ofX rays on bacteria. The peculiar penetrative action of therays would make them valuable aids to the physician if itcould once be shown that…
X-rays
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