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 17
... less than the quantity supplied , the reservoir so circumstanced will keep constantly full . * In a well sunk in any part of the country between the outcropping edges of the strata at b and b ' , the water will rise at the sur- face ...
... less than the quantity supplied , the reservoir so circumstanced will keep constantly full . * In a well sunk in any part of the country between the outcropping edges of the strata at b and b ' , the water will rise at the sur- face ...
Page 18
... less understood conditions which affect the supply of water in the water- bearing strata . From a better acquaintance with the Tertiary strata , and not on account of their relative importance , I pur- pose confining myself for ...
... less understood conditions which affect the supply of water in the water- bearing strata . From a better acquaintance with the Tertiary strata , and not on account of their relative importance , I pur- pose confining myself for ...
Page 22
... less water , yet the water so absorbed does not pass freely through the mass , but is held in the pores of the rock by capillary attraction , and parted with but very slowly ; so that in such deposits water can be freely transmitted ...
... less water , yet the water so absorbed does not pass freely through the mass , but is held in the pores of the rock by capillary attraction , and parted with but very slowly ; so that in such deposits water can be freely transmitted ...
Page 23
... less permeable , and b1 very thin . As we approach London , the thickness of 63 also diminishes . * For descriptions of several sections in this district see a paper by Mr. J. Morris , in Proc . Geol . Soc . Vol . II . p . 450 . + This ...
... less permeable , and b1 very thin . As we approach London , the thickness of 63 also diminishes . * For descriptions of several sections in this district see a paper by Mr. J. Morris , in Proc . Geol . Soc . Vol . II . p . 450 . + This ...
Page 31
... less coherent than the strata above and Fig . 9 . Section across the valley at Chinham , near Basingstoke . с V L a a , London clay ; b , Sands and mottled clays ; c , Chalk ; v , L , Level of the valley . below them . It may be ...
... less coherent than the strata above and Fig . 9 . Section across the valley at Chinham , near Basingstoke . с V L a a , London clay ; b , Sands and mottled clays ; c , Chalk ; v , L , Level of the valley . below them . It may be ...
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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.