The London, Edinburgh and Dublin philosophical magazine and journal of science . al to the time these particles lingerafter the rays are cut off, is greater for hydrogen than it isfor air. In fig. 5 we give the curves for air, chlorine, sulphurettedhydrogen, and mercury vapour, the curves being drawn onsuch scales that the ordinate representing the saturationcurrent is the same in all these cases. It will be noticed thatthe curves for air, for sulphuretted hydrogen, and for chlorinecoincide, mercury vapour falls below, while the hydrogen-curve would be above. This shows that, using the notatio
The London, Edinburgh and Dublin philosophical magazine and journal of science . al to the time these particles lingerafter the rays are cut off, is greater for hydrogen than it isfor air. In fig. 5 we give the curves for air, chlorine, sulphurettedhydrogen, and mercury vapour, the curves being drawn onsuch scales that the ordinate representing the saturationcurrent is the same in all these cases. It will be noticed thatthe curves for air, for sulphuretted hydrogen, and for chlorinecoincide, mercury vapour falls below, while the hydrogen-curve would be above. This shows that, using the notationof equation (6), UT is the same for air, chlorine, and sul-phuretted hydrogen, and that its value for these gases issmaller than for hydrogen and greater than for mercuryvapour. It is remarkable that the shapes of the curves for air,sulphuretted hydrogen, and chlorine should agree so closely, of Electricity through Gases exposed to Rontgen Rays. 405 for the absolute values of the current in these gases is verydifferent, the saturation current in sulphuretted hydrogen Fig. being in some cases three or four times that of air, while thatof chlorine is in some cases as much as ten times that of air. The value of the saturation current varies greatly indifferent gases ; of the gases we have tried it is least inhydrogen, greatest in mercury vapour, the saturation currentin mercury vapour being about 20 times that for air. It doesnot seem to depend entirely on the density of the gas, as insulphuretted hydrogen it is three or four times what it is inair, though the densities are nearly equal, while, though thedensity of the vapour of CH2T2 is greater than that of mercuryvapour, the saturation current in the former gas is only asmall fraction of its value for the latter. The gases whichhave large saturation currents are those which contain theelements which have an abnormally large specific inductivecapacity in comparison with their valency. We have made a large number of experimen
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