Harry explained guardedly, and they went on.
CHAPTER VI
THE MYSTERY OF BRAY PARK
"I hope he'll be all right," said Dick.
"They'll find him, I'm sure," said Harry. "Even if they don't, he'll be all
right for a few days--two or three, anyhow. A man can be very uncomfortable
and miserable, and still not be in any danger. We don't need half as much
food as we eat, really. I've heard that lots of times."
They were riding along the line that Harry had marked on his map, and, a
mile or two ahead, there was visible an old-fashioned house, with a tower
projecting from its centre. From this, Harry had decided, they should be
able to get the view they required and so locate the second heliographing
station.
"How far away do you think it ought to be, Harry?" asked Dick.
"It's very hard to tell, Dick. A first-class heliograph is visible for a
very long way, if the conditions are right. That is, if the sun is out and
the ground is level. In South Africa, for instance, or in Egypt, it would
work for nearly a hundred miles, or maybe even more. But here I should
think eight or ten miles would be the limit. And it's cloudy so often that
it must be very uncertain."
"Why don't they use flags, then?"
"The way we do in the scouts? Well, I guess that's because the heliograph
is so much more secret.
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