"
Silently, in their prison, but which they could now leave
whenever they pleased, the adventurers watched the diamond makers
once more. The same process they had witnessed before was gone
through with. The white balls were put inside the steel box and
sealed up. Then they waited for the storm to reach its height.
That this would not be long was evidenced by the mutterings of
thunder which every moment grew louder. The outburst of
electrical fury was likely to take place momentarily, and that it
would be unusually severe was shown by the precautions taken by
the diamond makers. They attached a number of extra wires, and
brought out some insulated, hard rubber platforms, on which they
themselves stood. Tom and Mr. Jenks were much interested in
watching this detail of the work, and sought to learn how each
part of the process was done.
"I almost think we can make diamonds, Tom, when we get back to
civilization," whispered Mr. Jenks.
"I hope we can," answered Tom, "and we can't get back any too
soon to suit me. I want to be in my airship again."
"I don't blame you. But look, they are getting ready to adjust
the switch."
The adventurers ceased their whispered talk, and eagerly
watched the diamond makers. Folwell and Munson were hurrying to
and fro in the big cave, attending to the adjustments of the
machinery.
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