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Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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slipping by a peculiar form of spike, called a brob. The depths of the shafts in Cornish mines are reckoned from the level of the adit. Until lately the greatest depth yet attained was in the now abandoned Kuttenberg mine, in Bohemia. Some of the Newcastle mines are 1,800 feet deep. The depth of a mine in a mountainous country, such as the Tyrol, Bohemia, or Mexico, being reckoned from the surface, gives no indication of actual depth in respect of sea-level. The mine at Joachimsthal, in Bohemia, is 2,120 feet, but the surface of the ground at the mouth of the shaft is 2,388 feet, above sea-level. The Valenciana mine in Mexico is 5,910 feet above the level of the sea, and its deepest workings are 4,274 feet above that level. A boring at Minden is 2,231 feet deep, of which 1,993 feet are below the level of the sea. These depths are much exceeded by some in the Comstock lode, Nevada. 2. (Vehicle.) One of the bars between a pair of which a horse is hitched to a v