It is called a phonograph.
What do you think Mr. Edison called this machine?
He said, "I have invented a great many machines, but this is my baby, and I expect it to grow up and support me in my old age."
Would you like to know the names of some of his inventions.
One is the carbon telephone.
The tasimeter measures the heat even of the far away stars.
The electric pen multiplies copies of letters and drawings.
Over sixty thousand are now in use in this country.
The automatic telegraph permits the sending of several thousand words over the same wire in one minute.