London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 227
ncreased facility in the lockage of boats and getting of ships into dock, &c.4thly. The ordinary slidingvalve, or sluice, requires an amount of motion, to fully open it, equal to its entire diameter; whereas the double-seated valve, when fully open, has only moved a distance equal to one fourth… … seated valve of 24 in. aperture is shown, in vertical section, plan,and elevation, as arranged for application to dock or canal lock-gates, dams, &c., where the valve-case is secure<l to the retaining as applied to Catial and Dock Gates, ^r. 215 medium, whether gate or other thing, by the…
Architecture
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