When we start the
Etherium machine we shall go much more speedily."
"And when will that be?" asked Mark.
"I can't tell exactly. It will not be until we have passed
through the atmosphere of the earth, and there is no way of
ascertaining in advance just how thick that stratum is."
"Then how will you know?" asked Jack.
"By means of my instruments. When the hand on this dial points
to zero I will know that we are beyond the atmosphere, and that
it is time to start the Etherium motor."
"How do you know in which direction to steer?" asked Mark. "Can
you see anything out of that window?"
"Not a thing," replied the German. "Look for yourself."
Jack and Mark peered through the plate glass. All they could see
was a sort of white, fleecy mass of clouds that surrounded the
great projectile.
"It's just like when we were above the clouds in the Electric
Monarch," said Jack.
"Exactly," agreed Mr. Henderson.
"But if you can't see anything, how can you tell where to steer?"
asked Mark.
"By means of this instrument," replied Mr. Roumann, indicating
another among the many on the wall of the projectile.
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