Thus the steam engines on floating islands, for their propulsion and other mechanical purposes, will serve, at the same time, for the distillery of sweet water, which, collected in basins, may be led through channels over the island, while, where required, it may be refrigerated by artificial means, and changed into cool water, surpassing, in salubrity, the best spring water, because nature hardly ever distils water so purely, and without admixture of less wholesome matter.”

So much for these few and more obvious powers, already used to a trifling extent. But there are innumerable others in nature, not described nor discovered. These, however, will do for the present. This would be to make the sun and the moon equally our satellites. For, as the moon is the cause of the tides, and the sun the cause of the wind, which, in turn, is the cause of the waves, all the work of this planet would be performed by these far influences.

“But as these powers are very irregular and subject to interruptions; the next object is to show how they may be converted into powers that operate continually and uniformly for ever, until the machinery be worn out, or, in other words, into perpetual motions” … “Hitherto the power of the wind has been applied immediately upon the machinery for use, and we have had to wait the chances of the wind’s blowing; while the operation was stopped as soon as the wind ceased to blow. But the manner, which I shall state hereafter, of applying this power, is to make it operate only for collecting or storing up power, and then to take out of this store, at any time, as much as may be wanted for final operation upon the machines. The power stored up is to react as required, and may do so long after the original power of the wind has ceased. And though the wind should cease for intervals of many months, we may have by the same power a uniform perpetual motion in a very simple way.”

“The weight of a clock being wound up gives us an image of reaction. The sinking of this weight is the reaction of winding it up. It is not necessary to wait till it has run down before we wind up the weight, but it may be wound up at any time, partly or totally; and if done always before the weight reaches the bottom, the clock will be going perpetually. In a similar, though not in the same way, we may cause a reaction on a larger scale. We may raise, for instance, water by the immediate application of wind or steam to a pond upon some eminence, out of which, through an outlet, it may fall upon some wheel or other contrivance for setting machinery a going. Thus we may store up water in some eminent pond, and take out of this store, at any time, as much water through the outlet as we want to employ, by which means the original power may react for many days after it has ceased.” … “Such reservoirs of moderate elevation or size need not be made artificially, but will be found made by nature very frequently, requiring but little aid for their completion. They require no regularity of form. Any valley, with lower grounds in its vicinity, would answer the purpose. Small crevices may be filled up. Such places may be eligible for the beginning of enterprises of this kind.”

The greater the height, of course, the less water required.