The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 459
and carriage,or, by closing the valve, intercept the air, and give it motion. By this means, the conductor of the carriage may restrain and limit thevelocity, and stop the carriage, at any time and at any place, by a communi-cation from the valve, through the opening, to the conductor on the… … Fig. 4. of the vane, a, b, c, d, is leathered all round, and the middle part, o, p, q, r,is open, and is to be closed by the double valve, that is to turn upon its ver-tical axis e, e. The valve will shut, half on one side of the vane a, b, c, d.and half on the other; when it is shut, the air will…
Architecture · Civil engineering · Science
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