i82 ALEXANDER GRAHAM BELL 



of the portable form containing the magnet inside the handle, 

 Dr. Channing was kind enough to send me a pair of telephones 

 of a similar pattern, which had been invented by experimenters 

 at Providence. The convenient form of the mouthpiece 

 adopted by me, was invented solely by my friend. Professor 

 Peirce. I must also express my obligations to my friend and 

 associate, Mr. Thomas A. Watson, of Salem, Massachusetts, 

 who for two years gave me his personal assistance in carry- 

 ing on my researches. 



