JAN 11 1921 

 PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LIX. 1920. No. 5. 



CONTENTS 



PAGS 



The Transient Process of Establishing a Steadily Alternating Current 

 on a Long Line, from Laboratory Measurements on an Artificial 

 Line. By A. E. Kenneli.y and U. Nabeshima - - - - - 325 



U. S. Navy MV Type of Hydrophone as an Aid and Safeguard to 



Navigation. By H. C. Hayes ----------371 



PHILADELPHIA 



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