 | 1837 - 1032 pàgines
...porous soil is the shallowest above the breaking out, so as to require the least depth of drain; nut the solid stratum must be reached, or the draining...too obvious not to have struck any one who seriously conv.dered the subject. In the practical application of the principle great ingenuity and skill may... | |
 | 1838 - 530 pàgines
...impervious earth. The place for this channel is where the porous soil is the shallowest above the breaking out, so as to require the least depth of drain ; but...•will be imperfect. It is by attending to all these circu instances that Elkington acquired his celebrity in drain1 1 1 _', and that he has been considered... | |
 | Charles Knight - 1851 - 1070 pàgines
...where the porous soil is the shallowest above tho breaking out, so as to require tin1 least deptli of drain ; but the solid stratum must be reached, or the draining will be imperfect. When there is a great variation in the soil, and it is difficult to find any main line of springs,... | |
 | 1853 - 1032 pàgines
...impervious earth. The place for this channel is where the porous soil is the shallowest above the breaking out, so as to require the least depth of drain, but...must be reached, or the draining will be imperfect. When there is a great variation in the soil, and it is difficult to find any main line of springs,... | |
 | William Lewis Rham - 1855 - 522 pàgines
...impervious earth. The place for this channel is where the porous soil is the shallowest above the breaking out, so as to require the least depth of drain, but...celebrity in draining, and that he has been considered an the father of the system. It is however of much earlier invention, and. is too obvious not to have... | |
 | National cyclopaedia - 1879 - 722 pàgines
...impervious earth. The place for this channel is where the porous soil is the shallowest above the breaking out, so as to require the least depth of drain ; but...must be reached, or the draining will be imperfect. When there is a great variation in the soil, and it is difficult to find any main line of springs,... | |
 | Tea cycolopaedia - 1882 - 406 pàgines
...impervious earth. The place for this channel is where the porous soil is the shallowest above the breaking out, so as to require the least depth of drain ; but the solid stratum .uust be reached, or the draining will be imperfect. When there is a great variation in the soil, and... | |
 | 1882 - 406 pàgines
...impervious earth. The place for this channel is where the porous soil is the shallowest above the breaking out, so as, to require the least depth of drain ; but the solid stratum Jiust be reached, or the draining will be imperfect. When there is a great variation in the soil, and... | |
 | None - 1854 - 600 pàgines
...impervious earth. The place for this channel is where the porous soil is the shallowest above the breaking out, so as to require the least depth of drain ; but...be reached, or the draining will be imperfect. It was by attending to all these circumstances that Elkington acquired his celebrity in draining, and... | |
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... the obvious remedy is to cut a channel with a sufficient declivity to take off the water in a direction across this line, and sunk through the porous soil at the surface into the lower impervious earth. The place for this channel is where the porous... 