The Useful Arts: Considered in Connexion with the Applications of Science, Band 2

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Harper & brothers, 1853
 

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Seite 34 - Locks are tight, oblong enclosures, in the bed of the canal, furnished with gates at each end, which separate the higher from the lower parts of the canal. When a boat passes up the canal, the lower gates are opened, and the boat glides into the look, after which the lower gates are shut.
Seite 370 - It is the curve described by a point in the circumference of a circle, while the circle itself rolls in a straight line along a plane.
Seite 239 - ... than the intended bore of the barrel. The edges of the plate are made to overlap each other about half an inch, and are welded together by heating the tube in lengths of two or three inches at a time, and hammering it with very...
Seite 125 - Cornwall, performs as much labour as a day's work of fifty such horses. The great pyramid of Egypt stands upon a base measuring seven hundred feet each way, and is five hundred feet high, its weight being twelve thousand seven hundred and sixty millions of pounds. Herodotus states, that in constructing it one hundred thousand men were constantly employed for twenty years. The materials of this pyramid would be raised from the ground to their present position by the combustion of about four hundred...
Seite 278 - Sometimes, however, rocks intercept the way, which require great labor to penetrate ; but this is always effected by pecking, which slowly pulverizes the stone. The most unpleasant circumstance attendant upon this business, is the occasional breaking of a rod into the hole, which sometimes creates a delay of many days, and an incalculable labor in drawing up the lower portion.

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