Hays, Wilma Pitchford.
Samuel Morse and the telegraph.
New York, F. Watts 
|提及的人：||Samuel Finley Breese Morse|
Wilma Pitchford Hays
|描述：||66 pages illustrations 23 cm.|
|责任：||Pictures by Richard Mayhew.|
Samuel Morse was forty-one years old and a famous portrait painter when an important question burst into his mind: If the presence of electricity could be made visible in any part of a circuit, why could not messages be transmitted instantaneously by electricity? Thus the idea for the telegraph was born.