h, and 21 inches in diameter. Its weight chamber, ave carefully tarred inside or lined with rubber, so | out being discovered. In a boat at 2,000 yards distance from is 11 cwt. About four horse as to preclude any possible leak- : age. The column, D, is united Fig. 2, power is required to drive it… … pegs, R, which connect it with view a simple mechanical regu-
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