Abstract
WHEN I was asked, a month or two ago, to illustrate in this theatre some of my recent researches 011 molecular physics in high vacua, I exclaimed, “How is it possible to bring such a subject worthily before a Royal Institution audience when none of the experiments can be seen more than three feet off?” If to-night I am fortunate enough to show all the experiments to those who are not far distant, and if I succeed in making most of them visible at the far end of the theatre, such a success will be entirely due to the great.kindness of your late secretary, Mr. Spottiswoode, who has placed at my disposal his magnificent induction coil—not only for this lecture, but for some weeks past in my own laboratory—thus enabling me to prepare apparatus and vacuum tubes on a scale so large as to relieve me of all anxiety so far as the experimental illustrations are concerned.
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