36 THE ROYAL SOCIETY OF CANADA 



asbestos was amply sufficient to ensure continuous runs of long enough 

 duration to make liquid hydrogen in comparatively large quantities. 



In concluding I wish to express my appreciation of the help 

 given by Mr. G. M. Shrum, M.A., and by those members of the 

 mechanical staff of the Department of Physics who assisted in 

 constructing, assembling, and operating the equipment. I also wish 

 to record my thanks to Professors Dawes and McTaggart, and to 

 Mr. John Patterson, M.A., of the Meteorological Office, Toronto, 

 for the benefit of ^heir advice kindly given in numerous consultations 

 regarding details of the design of the apparatus. 



