"Very much so," was the answer. "According to most astronomers, there
is absolutely no air on the moon, also no moisture, and the temperature
is either very high or around the freezing point. We must find out what
it is."
"How can we?" inquired Mark.
"I'll soon show you," went on the German. "Professor Henderson, will
you kindly assist me."
When it had been decided to come to the moon in quest for the field of
diamonds, certain changes had been made in the _Annihilator_ to fit it
for new conditions that might be met. One of these consisted of an
aperture in the two sides of the projectile permitting certain delicate
instruments to be thrust out, so that the conditions they indicated
could be read on dials or graduated scales from within.
"We will first make a test of the temperature," said Mr. Roumann, "as
that will be the easiest." Accordingly a thermometer was put outside,
and those in the air-craft anxiously watched the red column of spirits.
The temperature was marked as seventy-five inside the _Annihilator_,
but the thermometer had not been outside more than a second before
it began falling.
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