And before I do any talking worth mentioning, I'm going to give you
a little idea of what the wireless telephone can do."

The boys watched him breathlessly as he handled two of the knobs at
the side of the box. A moment later they heard the clear, vibrant
notes of a violin playing a beautiful selection from one of the
operas. The music rose and swelled in wonderful sweetness until it
filled the room, with the delicious melody and held all the hearers
entranced under its spell. It was evident that only the hand of
a master could draw such exquisite music from the instrument.

The doctor waited until the last notes had died away, and smiled with
gratification as he saw the rapt look on the faces of his visitors.

"Sounds as if it were in the next room, doesn't it?" he asked.
"But that music came from Newark, New Jersey."

"Gee," whispered Jimmy to Bob, alongside whom he was sitting,
"that's nearly a hundred miles from here."

"But there's no need of confining ourselves to any place as near
as that," continued the doctor. "What do you say to listening in
on Pittsburg? That's only a trifle of four hundred miles or so
from here."

"He calls four hundred miles a trifle!" breathed Jimmy. "Pinch me,
somebody. I must be dreaming."

Joe on his other side pinched him so sharply that Jimmy almost
jumped from his chair.