XII. <i>Investigation of the arc in metallic vapours in an exhausted space. (Contribution from the Research Laboratory of General Electric Co., Schenectady, N.Y.</i>

Abstract

The Arc in :Lfetallic Vapours in an Exhausted Space.95 certainty for the discrepancy between his results and those which I obtained, but I think it probable that the apparatus which he used may not have been sensitive enough to detect the alteration in the ionization.He mentions that at the higher temperatures the " heated vessel appeared less active," but attributed this to some other cause.It looks extremely probable that this was a genuine effect, but that the detecting instrmnent was not sensitive enough to show the efibct to a sufficiently great extent.In the experiments which I did the electrometer used was a very sensitive one, giving a deflexion of about two thousand scale-divisions for a difference of potential of one volt between the quadrants.There was therefore no difficulty in detecting any alteration that might take place in the ionization.In conclusion I desire to express mythanks to Prof. Thomson for the kindly interest shown and advice given throughout the course of this investigation.