THE THEORY OF 



lONIZATION OF GASES 



BY COLLISION 



BY 



JOHN S. TOWNSEND M.A. F.R.S. 



WYKEHAM PROFESSOR OF PHYSICS, OXFORD, 



FELLOW OF NEW COLLEGE, OXFORD, 

 FORMERLY FELLOW OF TRINITY COLLEGE, CAMBRIDGE. 



LONDON 



CONSTABLE & COMPANY LTD 



10 ORANGE STREET LEICESTER SQUARE WC 



1910 



