The electric strength of air at atmospheric pressure under alternating and continuous potentials .. . 19 IIIPRELIMINARY EXPERIMENTS (a) Calculation of approximate sizes of tube and wire toproduce corona at the voltages available; On undertaking thisinvestigation the approximate sizes of wire on which coronawould appear for both alternating and continuous current withtubes of a given diameter were first calculated from the re-sults of previous researches. Two tubes were used, with in-side diameters of and cm. respectively. Sixsizes of wire were used with diameters of , , 0
The electric strength of air at atmospheric pressure under alternating and continuous potentials .. . 19 IIIPRELIMINARY EXPERIMENTS (a) Calculation of approximate sizes of tube and wire toproduce corona at the voltages available; On undertaking thisinvestigation the approximate sizes of wire on which coronawould appear for both alternating and continuous current withtubes of a given diameter were first calculated from the re-sults of previous researches. Two tubes were used, with in-side diameters of and cm. respectively. Sixsizes of wire were used with diameters of , , , and cms. All were of brass except the largestwhich was of steel. The wires were always carefully polishedwith crocus cloth and chamois before introducing them intothe tube. (b) Determination of the amount of capacity needed toinsure constant voltage in the case of the high voltage gener-ator: The first tests made were with the high voltage genera-tor as a source of potential. A number of runs were made onthe same tube and wire and the voltage at which corona appear-ed, as determi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectatmosphericpressure
