A geological inquiry respecting the water-bearing strata of the country around London, with reference especially to the water-supply of the metropolis |
From inside the book
Results 1-5 of 69
Page 8
... appears that a square shaft six to ten French feet on the sides was first sunk through about 80 feet of clays and marls , reaching at this depth a mass of limestone , through which the work was continued by a bore of six to eight inches ...
... appears that a square shaft six to ten French feet on the sides was first sunk through about 80 feet of clays and marls , reaching at this depth a mass of limestone , through which the work was continued by a bore of six to eight inches ...
Page 9
... appears to have been the principle of their con- struction , and so well preserved are the more essential parts of these ... appear to have been com- mon generally in the East at a very early period . The wells known as the " Wells of ...
... appears to have been the principle of their con- struction , and so well preserved are the more essential parts of these ... appear to have been com- mon generally in the East at a very early period . The wells known as the " Wells of ...
Page 14
... appear tedious , and almost unnecessary , were it not for the importance of the question ultimately to be resolved . Of the geological relations of the strata below the chalk , we have much more complete accounts . The valuable Me ...
... appear tedious , and almost unnecessary , were it not for the importance of the question ultimately to be resolved . Of the geological relations of the strata below the chalk , we have much more complete accounts . The valuable Me ...
Page 27
... appear from them that the mean result of the whole is very different from any of those obtained in separate di- visions of the country . The mean thickness of the deposit throughout the whole Tertiary area may be taken at sixty- two ...
... appear from them that the mean result of the whole is very different from any of those obtained in separate di- visions of the country . The mean thickness of the deposit throughout the whole Tertiary area may be taken at sixty- two ...
Page 34
... Lower Tertiary strata . c . Chalk . Favourable as such districts might at first appear to be from the extent of their exposed surface , nevertheless they rarely contribute to the water - supply of the wells 34 GEOLOGICAL CONDITIONS.
... Lower Tertiary strata . c . Chalk . Favourable as such districts might at first appear to be from the extent of their exposed surface , nevertheless they rarely contribute to the water - supply of the wells 34 GEOLOGICAL CONDITIONS.
Other editions - View all
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.