Economic Geology: Or, Geology in Its Relations to the Arts and ManufacturesW. Blackwood and sons, 1874 - 336 páginas |
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Página 5
... proportion to his scientific knowledge of the subjects with which he has to deal . Sinking shafts , driving drifts , pumping , and ventilation , are arts of prime im- portance ; but where to sink , the nature of the minerals sought ...
... proportion to his scientific knowledge of the subjects with which he has to deal . Sinking shafts , driving drifts , pumping , and ventilation , are arts of prime im- portance ; but where to sink , the nature of the minerals sought ...
Página 35
... proportions of soda , potash , lime , and iron ) which mainly yield this poor moorland covering , the sterility of which is aggravated by its general high elevation , whitish colour , and the impervious nature of the rock on which it ...
... proportions of soda , potash , lime , and iron ) which mainly yield this poor moorland covering , the sterility of which is aggravated by its general high elevation , whitish colour , and the impervious nature of the rock on which it ...
Página 40
... proportion of the various earths may vary from 50 to 70 per cent of silicious matter , 20 to 40 per cent of clay , and 10 to 20 per cent of calcareous matter . According as the climate is wet or dry , the soil should be friable or ...
... proportion of the various earths may vary from 50 to 70 per cent of silicious matter , 20 to 40 per cent of clay , and 10 to 20 per cent of calcareous matter . According as the climate is wet or dry , the soil should be friable or ...
Página 44
... proportions of sulphate and silicate of lime ( evolved in the kiln ) which may render it more useful to the growing crops . " The limestones are largely developed in the British Islands , and occur in all the geological systems ...
... proportions of sulphate and silicate of lime ( evolved in the kiln ) which may render it more useful to the growing crops . " The limestones are largely developed in the British Islands , and occur in all the geological systems ...
Página 60
... proportions ; and their adventitious or accessory minerals are garnet , tourmaline , beryl , rock - crystal , and iron pyrites . By essential ingredients are meant those which constitute the mass of the rock ; by the adventitious are ...
... proportions ; and their adventitious or accessory minerals are garnet , tourmaline , beryl , rock - crystal , and iron pyrites . By essential ingredients are meant those which constitute the mass of the rock ; by the adventitious are ...
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