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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
circumference, and will bear 1/2 ton weight. Sir William Thomson proposes the use of steel wire. With this, using a 30-pound lead, he states that he obtained bottom in the Bay of Biscay at 2,700 fathoms. In the sounding apparatus of Professor Trowbridge, the coil of line is inclosed in a hollow cylindrical case, which is connected with the lead, and unwinds from the center as the latter descends, avoiding the friction of the water and securing a uniform and rapid rate of descent. The timnected with the lead, and also with an alarm or chronoscope, and a battery in the boat from which the observation is made. The impact of the lead on the bottom completes an electric current, and the time of descent is thus ascertained. Professor Trowbridge has also employed a pair of Saxton's current meters in connection with the tube containing the line. This instrument consists of a delicately pivoted helix, which is turned by the action of the water, and registers the number of revolutio