I'm too afraid of falling."
"Tom, what's this?" asked Ned one day, when he and Tom had come
to see how the work of remodeling the submarine was getting
along. "It looks like something you used when you dug your big
tunnel."
"That's a new kind of diving bell," Tom answered. "You know it
isn't easy to get treasure out of a sunken ship. It isn't like
picking it off the bottom of the ocean. We've got to get it out
from inside--perhaps from inside a strong box or a safe. This
bell may come in useful."
"Can't you use the special diving suits that you always used to
carry?" the financial manager wanted to know.
"We might, if the water isn't too deep," replied Tom. "But you
know there is a limit to how far down a man in even my kind of
diving dress can go. With this diving bell a much greater depth
can be reached. And this diving bell is not like any you have
ever seen or read about. My father gave me the idea for it. I'll
demonstrate it to you some day."
A diving bell is shaped like its name. A common glass tumbler
thrust down into a pail of water, with the open side down, will
show exactly the principle on which a diving bell works.
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