Christie, Arthur Carlisle, 1879- · Philadelphia ; London : Lippincott · leaf 58
he metal plate 13 and is con-veyed through wire 21 to 18 and thence to the positive EXCITING THE RONTGEN-RAY TUBE 45 terminal of the tube, just as it was in the first instancewhen a was the positive of the secondary; the currentthen returns through 20, 17, 14, and revolving arm16, to 12 and thence… … Figs. 18 and 19.—Illustrating rectification of current by revolving discs. Instead of using four revolving arms to rectifythe current, a revolving disc on which are mountedtwo metal strips is used in some constructions, tosecure a unidirectional current. Figs. 17 and 18illustrate this method of…
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