Economic Geology: Or, Geology in Its Relations to the Arts and ManufacturesW. Blackwood and sons, 1874 - 336 páginas |
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Página 31
... render more intelli- gible the following chapters , whether devoted to farming , building , engineering , mining , heating , lighting , or other tech- nological purposes . 6 Works which may be consulted . Lyell's Student's Elements of ...
... render more intelli- gible the following chapters , whether devoted to farming , building , engineering , mining , heating , lighting , or other tech- nological purposes . 6 Works which may be consulted . Lyell's Student's Elements of ...
Página 32
... render valuable assistance ; and it is often more through the indolence of routine than through pre- judice that the ... rendered as fertile as it is possible for skill and industry to accomplish . In the present chapter we intend to ...
... render valuable assistance ; and it is often more through the indolence of routine than through pre- judice that the ... rendered as fertile as it is possible for skill and industry to accomplish . In the present chapter we intend to ...
Página 37
... render this one more friable and that more compact , to improve this one by drainage and that by manuring , is the sum and substance of judicious and successful farming . Taking a good loam ( an admixture of clay , SOILS AND SUBSOILS ...
... render this one more friable and that more compact , to improve this one by drainage and that by manuring , is the sum and substance of judicious and successful farming . Taking a good loam ( an admixture of clay , SOILS AND SUBSOILS ...
Página 38
... rendered friable by admixture with the shelly sand ; and such clayey soils may also be improved by burning , which not only renders them freer , but converts their potash from an insoluble to a soluble state . The thinnish loam might be ...
... rendered friable by admixture with the shelly sand ; and such clayey soils may also be improved by burning , which not only renders them freer , but converts their potash from an insoluble to a soluble state . The thinnish loam might be ...
Página 39
... rendering the soil drier and more absorbent of the sun's heat , more friable and opener in texture for the admission of air and rain , which prevent the generation of deleterious acids , more accessible to the tender permeating rootlets ...
... rendering the soil drier and more absorbent of the sun's heat , more friable and opener in texture for the admission of air and rain , which prevent the generation of deleterious acids , more accessible to the tender permeating rootlets ...
Outras edições - Ver tudo
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Palavras e frases frequentes
abundant admixture agricultural alumina amount antimony arsenic artificial arts and manufactures basalts beds bismuth bituminous blocks borax Britain calcareous carbonate carbonic acid Carboniferous cements chalk chemical chiefly chloride clay coal colour compact composition consists containing copper crust crystalline crystals deposits Derbyshire districts durable earth employed engineer extensively felspar fire-clay formations gems geologist Geology gold granites greenstones grits gypsum hard heat hence hydraulic ingredients iron ironstones known lignites lime limestones lustre magnesia manganese manures marbles masses material metamorphic mineral and metallic mortar nature obtained occasionally occur Oolite ornamental oxide peat pigments polishing porphyries potash preparation purposes pyrites quarries quartz require rocks saline salts sand sandstones schists serpentines shales silica Silurian silver soda sodium soft soils specific gravity springs stones strata stratified structure substances sulphate sulphide sulphuric acid surface tertiary texture thickness tints tion tons usually varieties various vary veins volcanic yellow yield zinc