A geological inquiry respecting the water-bearing strata of the country around London, with reference especially to the water-supply of the metropolis |
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Page 5
... accuracy for an inquiry of this kind , nor was it needed for general geological purposes . Closer determinations of the thickness of the strata are also necessary . 7. If the thick mass of clay on which London INTRODUCTORY OBSERVATIONS . 5.
... accuracy for an inquiry of this kind , nor was it needed for general geological purposes . Closer determinations of the thickness of the strata are also necessary . 7. If the thick mass of clay on which London INTRODUCTORY OBSERVATIONS . 5.
Page 6
... mass of gravel , and is prevented from descending lower by the underlying surface of impermeable London clay . It there- fore spreads out in a sheet and is retained in the lower part of the gravel above that deposit , affording an ...
... mass of gravel , and is prevented from descending lower by the underlying surface of impermeable London clay . It there- fore spreads out in a sheet and is retained in the lower part of the gravel above that deposit , affording an ...
Page 7
... mass of the sands . But if , instead of this incohesive structure , the strata should be more solid and compact , then , although they will imbibe and retain a certain quantity of moisture by capillary attraction , water will not pass ...
... mass of the sands . But if , instead of this incohesive structure , the strata should be more solid and compact , then , although they will imbibe and retain a certain quantity of moisture by capillary attraction , water will not pass ...
Page 8
... mass of limestone , through which the work was continued by a bore of six to eight inches in diameter at top for about 300 feet , when strata of water - bearing sands were met with . A triple layer of wood was used for lining the sides ...
... mass of limestone , through which the work was continued by a bore of six to eight inches in diameter at top for about 300 feet , when strata of water - bearing sands were met with . A triple layer of wood was used for lining the sides ...
Page 12
... mass of these sands extends from Esher on the east to near Strathfieldsaye on the west , and from near Guildford on the south to Ascot and Virginia Water on the north , forming an elevated tract , composed , in the greater part , of ...
... mass of these sands extends from Esher on the east to near Strathfieldsaye on the west , and from near Guildford on the south to Ascot and Virginia Water on the north , forming an elevated tract , composed , in the greater part , of ...
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Common terms and phrases
alkaline appear arenaceous argillaceous Artesian average Bedfordshire beds beneath London bore Buckinghamshire calcareous Cambridgeshire carbonate of lime carbonic acid chalk marl considerable Cretaceous crop Degousée depth Devizes division Dorking drainage drift escarpment extent fall fault feet thick fissures flow formation France gallons of water Gault geological Godstone grains gravel green Grenelle ground Guildford height hills impermeable inches iron Kent lithological character London clay Lower Greensand Lower Tertiary sands Lower Tertiary strata mass Merstham mineral mottled clays nearly neighbourhood North Downs observations Oolite outcrop Oxfordshire Paris pass permeable portion probably proportion quantity of water rain rain-fall Reigate rise river rocks Saffron Walden salts sections siliceous soluble springs square miles subterranean sunk superficial area supply of water surface Surrey Tertiary district Thames tract traversed underground Upper Greensand valley varies water-bearing deposit water-bearing strata water-level water-supply Watford whilst
Popular passages
Page 164 - DEGREES OF HARDNESS AND DEGREES OF ALKALINITY EXPLAINED. Degrees of Hardness. — Each degree of hardness indicates as much hardness as would be produced by one grain of chalk per gallon held in solution in the form of bicarbonate of lime, free from any excess of carbonic acid. The degree of hardness caused by a lime salt depends, not on the state of combination of the calcium it contains, but on the quantity of the calcium.