Rollins, William Herbert, 1852-1929 · Boston : The University Press · leaf 596
NOTE 137 —FIGURE 18 —A METHOD OF CAST-ING OZOKERITE AROUND ONE PAIR OFCOILS, FORMING A SECTION OF AN INDUC-TION COIL WITH INTERCHANGEABLE SEC-TIONS IN THE SECONDARY Plate 73 … NOTE 137 —FIGURE 19 —A FINISHED SECTIONOF THE SECONDARY OF AN INDUCTIONCOIL HAVING INTERCHANGEABLE SEC-TIONS IN THE SECONDARY Plate 74
X-rays · Phototherapy
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