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 63
... Saffron Walden , in Essex , passed through 1000 feet of chalk before meeting with a sufficient supply of water ; and at Diss it was not until the whole of the chalk was traversed , that water was obtained . 59. The chalk district around ...
... Saffron Walden , in Essex , passed through 1000 feet of chalk before meeting with a sufficient supply of water ; and at Diss it was not until the whole of the chalk was traversed , that water was obtained . 59. The chalk district around ...
Page 77
... Saffron Walden the upper greensand was not reached although 1001 feet of chalk were traversed . - From the position of the Upper Greensand in this division , from its being so much covered by drift , and its small de- velopment , it is ...
... Saffron Walden the upper greensand was not reached although 1001 feet of chalk were traversed . - From the position of the Upper Greensand in this division , from its being so much covered by drift , and its small de- velopment , it is ...
Page 134
... Saffron Walden 134 THICKNESS AND DEPTH ON THE THICKNESS OF THE CHALK, AND ON THE PROBABLE DEPTH BENEATH LONDON OF THE UPPER AND LOWER GREENSANDS.
... Saffron Walden 134 THICKNESS AND DEPTH ON THE THICKNESS OF THE CHALK, AND ON THE PROBABLE DEPTH BENEATH LONDON OF THE UPPER AND LOWER GREENSANDS.
Page 135
... Saffron Walden , * and on a level rather lower than the hill on which that town is situated . They are nearly horizontal , as also is the under- lying chalk . This latter continues so nearly to Saffron Wal- den , that , I believe , a ...
... Saffron Walden , * and on a level rather lower than the hill on which that town is situated . They are nearly horizontal , as also is the under- lying chalk . This latter continues so nearly to Saffron Wal- den , that , I believe , a ...
Page 139
... Saffron Walden , formed a level surface continuous with that of the chalk now beneath London ; and originally the chalk may have been of nearly the same important thickness throughout this range of country , as it is at Saffron Walden ...
... Saffron Walden , formed a level surface continuous with that of the chalk now beneath London ; and originally the chalk may have been of nearly the same important thickness throughout this range of country , as it is at Saffron Walden ...
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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.