When you have risen as high as you wish, set the indicator to the
point of the compass you want to follow and you will be carried by the
proper electric force in that direction. To descend, set the
indicator to the word 'down.' Do you understand?"
"Perfectly!" cried Rob, taking the machine from the Demon with
unfeigned delight. "This is really wonderful, and I'm awfully obliged
to you!"
"Don't mention it," returned the Demon, dryly. "These three gifts you
may amuse yourself with for the next week. It seems hard to entrust
such great scientific discoveries to the discretion of a mere boy; but
they are quite harmless, so if you exercise proper care you can not
get into trouble through their possession. And who knows what
benefits to humanity may result? One week from to-day, at this hour,
I will again appear to you, at which time you shall receive the second
series of electrical gifts."
"I'm not sure," said Rob, "that I shall be able again to make the
connections that will strike the Master Key."
"Probably not," answered the Demon. "Could you accomplish that, you
might command my services forever.
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