Electric Generators. 69 



easily imagined that many mistakes occurred, 

 to say nothing of the time it required for rep- 

 etition. When the battle of Waterloo was 

 fought so the story goes news was sent to 

 England by means of the semaphore-telegraph. 

 The dispatch read, "Wellington defeated 

 At that point in the message a thick fog came 

 up and lasted for three days, so that no further 

 news could be sent or received. In the tele- 

 graphic parlance of to-day the line was 

 " busted." For three long days all London 

 was in deep mourning, when finally the. fog 

 lifted, which repaired the telegraphic line, and 

 the balance of the dispatch was received 

 " th French at Waterloo." Mourning changed 

 to rejoicing and the English have rejoiced 

 ever since when they think of either Welling- 

 ton or Waterloo. 



But to return to the dynamo. The name 

 dynamo is an abbreviation for dynamo-elec- 

 tric machine. A machine for producing dy- 

 namic electricity. There are many forms of 

 the dynamo, just as there are in the evolution 

 of every important machine, and there will be 

 many more. Hut the fundamental, under- 

 lying principle of iln-m all is contained in an 

 experiment made by Faraday. Faraday took 

 the soft iron " keeper " of a permanent magnet 

 and wound in-ulated wire around it and 

 hroiiirht the two -nd- of tin- wire close to- 

 gether. He n-.-w placed the keeper, with the 



