Among the first adventures in the field of making the useful necessities was the construction of a water wheel; the building of a sawmill, from which lumber was turned out to make their dwelling; a loom was put up which enabled them to weave clothing; and, finally, a wagon, which arose from the desire to utilize a herd of yaks, which they succeeded in capturing.
Before the present adventure a number of useful articles and tools had been made, among which might be mentioned a lathe, a foundry, in which they turned out articles in iron and brass, and this gave them an opportunity to make first a few pistols, and lastly, several guns, with which the present expedition was equipped.
All these things interested the boys, and they took delight in every part of it, and it gave them satisfaction to see the results of their work on every hand. But that which attracted them more intensely were the series of exploits which brought to light the hidden mysteries of the island, and which caused them to name it "Wonder Island."

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