After Tom Swift had sent his wireless message, and saved the
castaways of Earthquake Island, he thought he would give up his
inventive work for a time, and settle down to a life of ease and
quiet.

But the call of the spirit of adventure was still too strong for
him to resist. That was why he sought out the diamond makers, and
learned the secret of Phantom Mountain. And when he went to the
Caves of Ice, and there saw his airship wrecked, Tom was well-nigh
discouraged, But he managed to get back to civilization, and later
undertook a journey to elephant land, with his powerful electric
rifle.

Marvelous adventures underground did Tom Swift have when he went
to the City of Gold, and I have set down some of them in the book
bearing the latter title. Later on he sought the platinum treasure
in his air glider. And when Tom was taken captive, in giant land,
only his speedy airship saved him from a hard fate.

By this time moving pictures were beginning to occupy a large
place in the scientific, as well as the amusement world, and Tom
invented a Wizard Camera which did excellent work. Then came the
need of a powerful light, to enable Uncle Sam's custom officers on
the border to detect the smugglers, and Tom was successful in
making his apparatus.

He thought he would take a rest after that, but with the opening
of the Panama Canal came the need of powerful guns to protect that
important waterway, and Tom made a Giant Cannon, which enabled the
longest shots on record to be fired.