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 3
... neighbourhood draw their supplies , and to weigh the pro- bability of their being able to yield larger quantities of water than they now furnish . Third . To extend the inquiry to the strata beneath the chalk , with a view to ascertain ...
... neighbourhood draw their supplies , and to weigh the pro- bability of their being able to yield larger quantities of water than they now furnish . Third . To extend the inquiry to the strata beneath the chalk , with a view to ascertain ...
Page 13
... neighbourhood . They are here from seventy to eighty feet thick , but , owing to their irregulari- ties of structure and position , their water - value is compara- tively small , considering the area over which they are spread . 13. The ...
... neighbourhood . They are here from seventy to eighty feet thick , but , owing to their irregulari- ties of structure and position , their water - value is compara- tively small , considering the area over which they are spread . 13. The ...
Page 18
... neighbourhood , * are such as has just been described , a being supposed to represent the London clay , b the beds of sand and mottled clays beneath it , and c the chalk ; -this latter allowing , however , of the passage of water to a ...
... neighbourhood , * are such as has just been described , a being supposed to represent the London clay , b the beds of sand and mottled clays beneath it , and c the chalk ; -this latter allowing , however , of the passage of water to a ...
Page 24
... neighbourhood of London . Owing , however , to the constant presence of green and ferruginous sands , traces of vegetable matter and remains of fossil shells , the water is usually indifferent and chalybeate . The well - diggers term ...
... neighbourhood of London . Owing , however , to the constant presence of green and ferruginous sands , traces of vegetable matter and remains of fossil shells , the water is usually indifferent and chalybeate . The well - diggers term ...
Page 28
... neighbourhood , it would have been sufficient to have divided the group b into two parts , excluding altogether the upper one ( b1 of Fig . 4 ) . Measurement of sections Eastward of London . Southern Boundary . 28 GEOLOGICAL CONDITIONS.
... neighbourhood , it would have been sufficient to have divided the group b into two parts , excluding altogether the upper one ( b1 of Fig . 4 ) . Measurement of sections Eastward of London . Southern Boundary . 28 GEOLOGICAL CONDITIONS.
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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.