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Updated: June 7, 2025
Eventually, an open hydraulic canal, three- fourths of a mile long, was cut across the elbow of land on the American side, through the town of Niagara Falls, between the rapids above and the verge of the chasm below the Falls, where, since 1874, a cluster of factories has arisen, which discharge their spent water over the cliff in a series of cascades almost rivalling Niagara itself.
Indeed, if the temperature in winter rises above this minimum, there are often sudden outbreaks of malaria. Sometimes, during very warm and dry summers, the heat extracts all the humidity from the malarious soil, and thus procures for us a freedom from the disease which is purely hydraulic.
In the building of steel ships, as well as in the construction of bridges and other erections demanding much metal-work, great economies will be introduced by the reduction of the extent to which riveting will be required when the full advantages of hydraulic pressure are realised.
Around Oudenarde, in 1539, about fourteen thousand men, women and children were engaged in this work. Even the region of the Meuse was affected. It possessed mineral resources besides great hydraulic power in its rapid streams. At the beginning of the reign of Charles V, a great number of forges and blast furnaces heated with wood were installed in Namurois.
The height of the dam was 116.7 ft. and was provided with a by-wash of 394 ft. in length, and outlets for irrigation formed by four cast iron pipes of 31½ in. diameter through the dam. It was composed of rubble set in hydraulic mortar, the latter composed of two parts of sand to one of hydraulic lime.
With all hydraulic elevators of which I have cognizance, as much water is required to raise the empty cars as though they were loaded to maximum capacity. Still, to be available for passenger purposes elevators must have capacity of upward of 2,500 pounds, particularly in hotels, where the cars are often arranged with separate compartments underneath for baggage.
It was easy to predict that these would be rapidly destroyed by the swell of the waters, the shore having been weakened by taking away the earth from behind the dyke to employ it in these hydraulic constructions.
To prevent this result it is necessary to adopt some plan to raise the water, as fast as it accumulates in the low grounds, and convey it away. This is done by pumps and other such hydraulic engines, and these are worked in general by wind mills. They might be worked by steam engines; but steam engines are much more expensive than wind mills.
Why' says he, 'it'll drive 'em right into the Back Bay! Of course, I didn't know what the Back Bay was then, but I begun to open my eyes; thought I'd had 'em open before, but I guess I hadn't. Says he, 'That paint has got hydraulic cement in it, and it can stand fire and water and acids; he named over a lot of things.
A "claim" is the mining land owned or held by one man or a company. The placer mines are again classified according to the manner in which, or the instruments with which they are wrought. There are sluice claims, hydraulic claims, tunnel claims, dry washing, dry digging, and knife claims.
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