A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . less, the machinesettles slightly more by condensation of the air, a larger space is occupied by water, andthe nautilus redescends to the bottom with a constantly accelerating movement, seriouslyinconveniencing the operator by filling more or less with water, according to depth. Formany months the difficulties just enumerated baffled all attempts at control. A weightattached could be lifted, but the instant it was entirely suspended,—before the valves couldb(! c
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . less, the machinesettles slightly more by condensation of the air, a larger space is occupied by water, andthe nautilus redescends to the bottom with a constantly accelerating movement, seriouslyinconveniencing the operator by filling more or less with water, according to depth. Formany months the difficulties just enumerated baffled all attempts at control. A weightattached could be lifted, but the instant it was entirely suspended,—before the valves couldb(! closed,—upward movement was communicated beyond control. This difficulty, so fatal,li:is been overcome by an arrangement at the bottom of the nautilus, with channels whichradiate from the opening in an inclined direction, debouching at the sides of the moment, then, that the air, by its expansion from diminished resistance, or by theiiitroduction from above of a greater volume than can be sustained by the water below,reaches, in its do^^^lward passage, the level of these chambers, following the direction of 244. DIVING BELL. 471 least resistance, it passes througli these channels and escapes into the surrounding Tcatcr,without of course aftecting the movement of the machine in the least. The pump for supplying air to the diving-bell or other suitable vessel, is represented atfigs. 244 and 245, and is constructed as follows:—d is a cylinder, opening at the upperpart into a chamber or chambers f f, separated by a partition e. On the side of each ofthese chambers there is a valve h h, opening inwards, and at the upper part of the sameare two valves i i, opening outwards into the valve chamber g. Outside the opening foreach of the valves ii u, there is a cup, into which the end of the water supply pipe m passes;by this means a small stream of water is supplied to the cup, and is drawn frc^n it into thechamber f to supply the waste in the operation of pumping. The
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
