American Edition of the British Encyclopedia: Or, Dictionary of Arts and Sciences ; Comprising an Accurate and Popular View of the Present Improved State of Human Knowledge, 7권Mitchell, Ames and White, 1821 |
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... land ; whereby they insure immense returns . The Africans , in some parts , follow the Hindostanee plan ; but raise their water chiefly from the rivers , or obtain their supplies of that invaluable element from natural reservoirs ...
... land ; whereby they insure immense returns . The Africans , in some parts , follow the Hindostanee plan ; but raise their water chiefly from the rivers , or obtain their supplies of that invaluable element from natural reservoirs ...
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... land to be irrigated ; because that depth may be then kept as a surplus , in case of long - continued drought ; being let in upon the first drain by a very small penstock , made only to the depth of the first level . The water , when ...
... land to be irrigated ; because that depth may be then kept as a surplus , in case of long - continued drought ; being let in upon the first drain by a very small penstock , made only to the depth of the first level . The water , when ...
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... lands ; so that , when kept stationary for a few hours , the fecula and sediment may be deposited ; as is often the case ... land has been long watered , its qualities are meliorated considerably ; but this is not the work of a day ; and ...
... lands ; so that , when kept stationary for a few hours , the fecula and sediment may be deposited ; as is often the case ... land has been long watered , its qualities are meliorated considerably ; but this is not the work of a day ; and ...
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... land it is to overflow ; being made firm and level , by beating with the flat of a spade . As the penstocks are situated just below the lines of the branch- drains above described , they keep up the water , so as to fill , and to cause ...
... land it is to overflow ; being made firm and level , by beating with the flat of a spade . As the penstocks are situated just below the lines of the branch- drains above described , they keep up the water , so as to fill , and to cause ...
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... land ; and that , where water can be had at a due height , all the land below it may be watered . It matters not if a deep valley lay between two declivi- ties , to be watered by the same spring . A pipe , of suitable diameter , being ...
... land ; and that , where water can be had at a due height , all the land below it may be watered . It matters not if a deep valley lay between two declivi- ties , to be watered by the same spring . A pipe , of suitable diameter , being ...
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