THE BELL SYSTEM 



TECHNICAL JOURNAL 



\ O L U M E XXX OCTOBER 19 



N U M B K R 4 P A H T 1 



THIS ISSUE OF 



THE JOURNAL CELEBRATES THE 



SEVENTIETH BIRTHDAY OF 



CLINTON JOSEPH 

 D A V I S S O N 



IT IS CONTRIBUTED BY SOME OF HIS MANY FRIENDS 

 AND FORMER ASSOCIATES IN THE BELL TELEPHONE 

 LABOBATORIES AS A TOKEN OF THEIR AFFECTION 

 AND OF THEIR RECOGNITION OF THE VALUE OF HIS 

 MANY CONTRIBUTIONS IN THE FIELD OF 



PHYSICAL RESEARCH 



