Carnegie Institution of Washington publication . En outre, dans ce cas, la vis marquée55 et des bords tranchants similaires ailleurs que dans les disques cc, dd, etc., sont-inadmis sible. Sans bords arrondis et une vis arrondie, la dés-turbances secondaire en raison de vents électriques interférer avec l'interprétation de l'themeasurements et l'appareil ne prendra pas un potentiel élevé. Tous les partsexcept le disque cc sont bien sûr mis à la masse, et l'induction possible d'autres conducteurs et betweencc sauf dd doit être scrupuleusement protégée. Enfin, fig. 12 présente une alternative consistant à flotteur du disque e c

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Carnegie Institution of Washington publication . Furthermore, in this case the sharp screw55 and similar sharp edges elsewhere as in the disks cc, dd, etc., are inadmis-sible. Without rounded edges and a rounded screw, the secondary dis-turbances due to electric winds interfere with the interpretation of themeasurements and the apparatus will not take a high potential. All partsexcept the disk cc are of course put to earth, and possible induction betweencc and other conductors except dd must be scrupulously guarded against. Finally, fig. 12 shows an alternative float consisting of the disk e corre-sponding to fig. 11 A, the tube ff passing the preferably conical capsule ppabout 1.5 cm. high and 5 cm. in diameter, of thin brass hermetically sealed.The tube ff is prolonged below by the solid brass rod n or sinker. Whenplaced in the cup, fig. 11 a, or in a similar vessel, the water level is at wwand may be adjusted by dropping small weights down the tube ff. Thesame method, fig. 13, is used for placing this level. The whole arrangement. Fig. 12—Hydro-meter and diskcarried by air-chamber. Fig. 13.—Com-pression screwfor adjustinglevels. 42 THE DIFFUSION OF GASES THROUGH weighs about 35 grams, including disk and sinker. The essential part isthe tube//of copper about 0.5 cm. in diameter. This float is not intendedto rise and fall as in the case of fig. 11 a, but to move to a definite levelunder the influence of the electrical forces of the condenser. Water has been referred to as the liquid charge of the apparatus. It hasan advantage, inasmuch as the whole of the lower half of the condenser maybe earthed and the guard ring and disk are necessarily at the same potential.It has the very serious disadvantage, however, that large capillary forcesare involved, particularly in case of the wide stem of fig. 11 a. Hence acharge of kerosene oil or even of the heavier clear paraffin oil is preferable. In cases where the disk e in its uncharged position is to be flush with thesur

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• bookcentury1900
• bookdecade1910
• bookyear1913