Draining for Profit, and Draining for HealthOrange Judd Company, 1867 - 238 páginas |
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Página 34
... acre , ( 200 tons , ) would require over 20 tons of coal . Of course a considerable— probably by far the larger , —part of the heat taken up in the process of evaporation is furnished by the air ; 34 DRAINING FOR PROFIT AND HEALTH .
... acre , ( 200 tons , ) would require over 20 tons of coal . Of course a considerable— probably by far the larger , —part of the heat taken up in the process of evaporation is furnished by the air ; 34 DRAINING FOR PROFIT AND HEALTH .
Página 35
... point . It is , probably , in consequence of this cooling effect of evaporation , that wet lands are warmest when shaded , because , under this condition , evaporation is less active HOW DRAINS ACT , AND AFFECT THE SOIL . 35.
... point . It is , probably , in consequence of this cooling effect of evaporation , that wet lands are warmest when shaded , because , under this condition , evaporation is less active HOW DRAINS ACT , AND AFFECT THE SOIL . 35.
Página 69
... probably final ) jump to 50 , a " few inches under or over . We have dabbled in them all , " generally belonging to the deep section of the day . We " have used the words ' probably final , ' because the first " advances were ...
... probably final ) jump to 50 , a " few inches under or over . We have dabbled in them all , " generally belonging to the deep section of the day . We " have used the words ' probably final , ' because the first " advances were ...
Página 74
... probably find it impossible to so state the reasons for his decision , that they would be of any general value to others . Probably it will be a long time before rules on this subject , based on well sustained theory , can be laid down ...
... probably find it impossible to so state the reasons for his decision , that they would be of any general value to others . Probably it will be a long time before rules on this subject , based on well sustained theory , can be laid down ...
Página 78
... probably advisable , because they form so much better con- duits than stones , and to that extent have been so success- fully employed , that they are still largely used in this coun- try by amateurs . " Fig . 13. - HORSE - SHOE TILE ...
... probably advisable , because they form so much better con- duits than stones , and to that extent have been so success- fully employed , that they are still largely used in this coun- try by amateurs . " Fig . 13. - HORSE - SHOE TILE ...
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Draining for Profit, and Draining for Health George E 1833-1898 Waring Sin vista previa disponible - 2015 |
Términos y frases comunes
acre agricultural allow amount basin bottom brick bushels carried cause cent Central Park CHAPTER clay Clinometer collars commence condition connection considerable contour lines cost course covered crop cultivation deposit depth discharge diseases distance ditch drainage dyke earth effect evaporation fall farm farmer feet deep fever field fifth column filled flow four feet Gisborne grade ground Hackensack River heat heavy rain houses improvement inches inclination joints kiln labor laid land laying length less lower main drain malarious manure marsh matters measure moisture muddy water nearly necessary obstruction operation outlet particles pipes placed plants plowing porous practice prevent proper quantity rain-fall removed result roots salt marsh saturated season sewage sewers shown in Fig side silt silt-basin slope soakage spring stakes steepest descent stone subsoil sufficient tide tile drain tion typhoid fever under-draining undrained vegetable whole width
Pasajes populares
Página 80 - ... part.* When the Regent's Park was first drained large conduits were in fashion, and they were made circular by placing one horseshoe tile upon another. It would be difficult to invent a weaker conduit. On re-drainage innumerable instances were found in which the upper tile was broken through the crown, and had dropped into the lower. Next came the...
Página 221 - Excess of moisture, even on lands not evidently wet, is a cause of fogs and damps. " 2. Dampness serves as a medium for the conveyance of any decomposing matter that may be evolved, and adds to the injurious effects of such matters in the air; in other words, the excess of moisture may be said to increase or aggravate atmospheric impurities. " 3. The evaporation of the surplus moisture lowers the temperature, produces chills, and creates or aggravates the sudden and injurious changes or fluctuations...
Página 68 - A farmer manures a field of four or five inches of free soil reposing on a retentive clay, and sows it with wheat. It comes up, and between the kernel and the manure it looks well for a time, but anon it sickens. An Irish child looks well for five or six years, but after that time potato-feeding, and filth, and hardship, begin to tell.
Página 79 - ... material, even when the drain is completed, offers an imperfect resistance, but the constant pressure together of the sides, even when it does not produce a fracture of the soil, catches hold of the feet of the tile and breaks it through the crown. Consider the case of a drain formed...
Página 67 - ... against evaporation; and we are inclined to believe that any prejudicial combined action of attraction and evaporation is thereby well guarded against. The facts stated seem to prove that less will not suffice. So much on the score of temperature, but this is not all. Do the roots of esculents wish to penetrate into the earth — at least, to the depth of some feet? We believe that they do.
Página 167 - ... if it does come, then draining will pay for itself speedily. For instance, Mr. Johnson had a lot of thirteen acres on the shore of the lake, where the bank at the foot of the lot was perpendicular to the depth of thirty or forty feet. He supposed from this fact, and because the surface seemed very dry, that he had no need to drain it. But somehow he lost his...
Página 166 - ... clay tiles were buried in the ground. But this increase of crop is not the only profit of drainage ; for Mr. Johnston says that on drained land one half the usual quantity of manure suffices to give maximum crops. It is not difficult to find a reason for this. When the soil is sodden with water, air...
Página 225 - In the system now adopted, it has been sought to remove these evils by the construction of new lines of sewers, laid at right angles to the existing sewers, and a little below their levels, so as to intercept their contents, and convey them to an outfall 14 miles below London Bridge.