A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 220
, with a valve opening ontheir exterior extremity. When the flow ofwater from without approaches, it shuts thevalve, which remains in this state till the floodsubsides; when, the height of the water withinbemg greater than that without, it opens thevalve and flows off. These are common enoutrhin… … Here w is the wall, d the inner open d -lin,and t the ,tube or wooden tunnel through whichits redundant waters are carried off. River embankments are formed for protectingthe existing course of their waters; for changingor accommodating that course to particular cir-cumstances, and sometimes for…
Encyclopedias and dictionaries · Aeronautics
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