Rollins, William Herbert, 1852-1929 · Boston : The University Press · leaf 738
its hinge, the injured sectioneasily removed and replaced by a new section. The pri-mary is arranged to allow the sections to be used singly,in series, or otherwise. Multiple series spark-gaps en-able the vacuum tubes to be operated over a considerablerange in resistance. Plate 143 0cr. 2 J z:0 UJ… … NOTE 179 D —FIGURE 5 —A HINGED FARA-DAY RING FOR ETHER AND ELECTRONTHERAPEUTICS Plate 144
X-rays · Phototherapy
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