to be able to tell a good deal better. And if we get far enough
around, I don't believe they'll see us, or pay any attention to us
if they do."

So they mounted their machines again, and in a few moments were
speeding toward a new and better spot from which to spy on the
house. But this, when they reached it, only confirmed their first
guess. The signals were much more plainly visible here, and it
was obvious now, as it had not been before, that the screen they
had noticed had been erected as much to concentrate the flashes
and make them more easily visible to a receiving station as to
conceal the operator. So they turned and figured a straight line
as well as they could from the spot where the flashes were made.
Harry had a map with him, and on this he marked, as well as he
could, the location of the house. Then he drew a line from it to
the northwest.

"The next station must be on this line somewhere," he said.
"We'll stick to it. There's a road, you see, that we can follow
that's almost straight. And as soon as we come to a high building
we ought to be able to see both flashes -- the ones that are being
sent from that house and the answering signals. Do you see?"

"Yes, that'll be fine!" said Dick. "Come on!"

"Not so fast!" said a harsh voice behind them.

They spun around, and there, grinning a little, but looking highly
determined and dangerous, was the same man they had seen the day
before, and who had questioned them when the tire of their taxicab