Di Londra, Edimburgo e Dublino rivista filosofico e ufficiale della scienza . il tubo passata circolare throughthree parallelo reticelle, A, B, C, 2 di cms. Oltre andinsulated dall'altra. La prima garza era una massa conneetedto, il secondo B all'elettrometro, e il terzo C toone terminale di una batteria di storage-celle, l'altro terminale che era a terra. Un anello di guardia, collegato a terra.era disposta tra B e C per accertarsi che non vi è stata una perdita noconduction attraverso gli isolatori tra B e C. Si supponga che la garza C si carica positiva. Gli ioni positivi,eseguito con la corrente di aria

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The London, Edinburgh and Dublin philosophical magazine and journal of science . the tube passed throughthree circular parallel wire gauzes, A, B, C, 2 cms. apart andinsulated from each other. The first gauze A was conneetedto earth, the second B to the electrometer, and the third C toone terminal of a battery of storage-cells, the other terminalof which was to earth. A guard-ring, connected to earth.was arranged between B and C to ensure there was noconduction leakage across the insulators between B and C. Suppose gauze C is charged positive. The positive ions, carried with the current of air between the gauzes, start totravel up against the current of air, while the negative ionstravel to the positive electrode with the current. If thevelocity of the positive ions in the electric field is greater Radioactivity and Ionization of the Atmosphere. 721 than the current of air, they will all reach the gauze B andfor a given current of air the current observed with theelectrometer will be unaltered when the strength of theelectric field is increased. Fig. 7. fc&Tfy. It was experimentally observed that even with a smallelectric field, there was some current to the gauze B. Thisamount increased with the voltage to a practical maximum.The experimental results are shown graphically in fig. 8 (p. 722)for velocities of the current of air of 100, 205, and 250 cms.per sec. respectively, when the gauze C was charged positively.It will be seen from the curves that, for a velocity of 250cms. per sec, the maximum current is reached with a P.D.of about 350 volts. Since the gauzes were 2 cms. apart, thevelocity K of the positive ions for a potential gradient of1 volt per cm. is given by *=v = hi 2 x 250 350 = 1*4 cms. per sec. where u is velocity of current of air and V the smallest P.D.for which the maximum current is reached. The other twocurves also give a value of the positive ion of about 1*4 cms.per sec. It was not found possible to obtain more than anapproximate result for the v

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1840
• booksubjectscience
• bookyear1840