"
"Wonder if we could hear the barking of the hot dogs at Coney Island,"
whispered the irrepressible Herb, who would have his joke.
Bob nudged him sharply and Herb subsided.
"And you can pick out any kind of entertainment you want," the doctor
went on. "The great stations from which this music was sent out have
programs which are published every day, together with the exact time
that the selections will be given. At a given minute you can make your
adjustment and listen to a violin solo, a band concert, a political
speech, a sermon, or anything else that you want. If it doesn't please
you, you can shut it off at once, which is much easier and pleasanter
than getting up and going out from an audience.
"We'll have some more selections later on in the evening," he
continued, "but now I want to explain to you how this thing is done.
I can't hope to do much more than touch the surface of the subject
to-night, for I don't want to tire you out, and there'll be plenty of
other nights and days when I hope you boys will call upon me for any
information that you want and I can give.
"Of course the whole thing is based on electricity, the most wonderful
thing that perhaps there is in the whole physical world. Nobody knows
what electricity is--Mr. Edison himself doesn't know. We only know
that it is a wonderful fluid and that the ether is full of it.
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