240 



PIONEERS OF SCIENCE IN AMERICA. 



ing apparatus and in devising the relay instrument. In these 

 experiments he was assisted by Prof. Gale. Having set up his 

 telegraph so as to operate through about a third of a mile of 



F IG> 5. Prof. Morse's first telegraph instrument. 



wire stretched back and forth in the cabinet of the university, 

 he showed it to parties of visitors in the latter part of the 

 summer of 1837. Among those who saw it was Mr. Alfred 



