46 PROFESSOR HENRY AND THE 



Neither in England, where Wheatstone had a 

 patent founded on Henry's inventions, nor here, 

 where Morse had a similar one, could the telegraph 

 have been introduced for years after it really 

 was, but for the beneficient operation of the patent 

 laws. But few men are to be found who will 

 incur the risks, and expend the money, incident 

 to the introduction of a new and untried industry, 

 without the hope of that pecuniary return, which in 

 such cases, can only be secured by the exclusive 

 use for a "limited time" of the new thing, during 

 which it is hoped the original losses maybe repaid, 

 and a profit earned.* 



Let us now consider what would have been the 

 position of Henry in the world, if at any time 

 before his inventions had been so long in public 

 use that he had lost his rights, he had taken a 

 patent for. 



First, his magnetic spools, pure and simple; 



Secondly, the combination of a magnetic spool 

 of long fine wire, with an " intensity battery," for 

 the purpose of producing a practical magnetic 

 effect at great distances; 



Thirdly, the combination with such an appa- 

 ratus of a quantity battery, operating upon a spool- 

 magnet of coarse and short wire, at a distance 

 from the intensity battery; whereby the great lift- 



* See Appendix, Note W. 



