High frequency apparatus, design, construction and practical application; a practical treatise for electrical engineers, electricans, physicians, students and experimenters (1920)
Curtis, Thomas Stanley · New York, Norman W. Henley publishing company · leaf 196
HIGH FREQUENCY PLANT CULTURE 191 proved its value in actual practice and, while it may appearto be unnecessarily complex in design, still the many pointsof advantage are only brought out through the construc-tion of a substantial and more or less massive affair. With reference to the side elevation… … Defofl of rotoron(f shoff Oefo/t of brush <if)o/cfer Fig. 107.—Details of the spark gap arranged to rotate in opposite directions at a fairly rapidrate of speed. The rotation serves the double purpose ofalways presenting a fresh sparking surface, and thereforea cool one, to the point of…
Electric apparatus and appliances
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