A Treatise on Waterworks for the Supply of Cities and Towns: With a Description of the Principal Geological Formations of England as Influencing Supplies of WaterLockwood & Company, 1875 - 413 páginas |
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Términos y frases comunes
18 inches 24 hours artesian average Bagshot Bagshot sands basin beds bore-hole boring bottom Boulton and Watt breadth brick brickwork chalk coal Company cornbrash Cornish engine cost cubic feet cylinder engine district Ditto double acting drainage area duty estimate feet below surface feet deep feet diameter feet high feet in depth feet per minute filter flow foot high formation friction fuller's-earth gallons a day gallons per day gauging gault gravel height high per minute hills horse power inches diameter Kimmeridge clay lias limestone Liverpool London clay lower green sand Messrs miles million gallons millstone grit nearly neighbourhood Oxford clay Permian pipe piston plunger pressure Prestwich pumping engines quantity of water red sandstone river river Tame rocks shaft sinking springs square inch square miles steam strata sunk supply of water tertiary town tube upper green sand valley valve velocity Waterworks Watford weir whole Wolverhampton yield
Pasajes populares
Página 164 - That the permeability of the sandstone is occasionally interfered with by faults or fissures filled with argillaceous matter, sometimes rendering them partially or wholly water-tight. That neither by sinking, tunnelling...
Página 19 - ... these two Hills is a Valley of Denudation, B. Towards the head of this Valley the junction of the permeable stratum a, a', with the Clay bed b, b', produces a spring at the point S. ; here the intersection of these strata by the denudation of the valley affords a perennial issue to the Rain water, which falls upon the adjacent upland plain, and percolating downwards to the bottom of the porous stratum a, a', accumulates therein until it is discharged by numerous springs, in positions similar...
Página iii - WATER WORKS, for the Supply of Cities and Towns. With a Description of the Principal Geological Formations of England as in'fluencing Supplies of Water ; and Details of Engines and Pumping Machinery for raising Water.
Página 30 - Thus, the measurement of a chalk well in London would show the days of the week and the great festivals, by the daily variations ; the seasons would be indicated by the average difference in the height of the level at different periods of the year ; and the changes of the weather by the falling of rain, would also be shown.
Página 36 - The level of high water mark in the Thames is represented by the horizontal line ab, and the presumed line of saturation or height to which the water from the chalk will rise at any point between London and Tring, is represented by the inclined line cd, drawn from the top of the gault below Tring to tide level in the Thames at Lewisham, where the chalk is exposed in the basin of the Thames. It will be observed that in this section I have not shown the beds in one continuous uninterrupted basin-shaped...
Página 164 - That the contributing area to any given well is limited by the amount of friction experienced by the movement of the water through the fissures and pores of the sandstone ; and " That there is little or no probability of obtaining permanently more than about 1,000,000 or 1,200,000 gallons a day, and this only when not interfered with by other deep wells.
Página 393 - The following Table has been compiled with the object of furnishing an approximate value of the power in horses rendered by Cornish Pumping Engines having cylinders from 15 to 100 inches diameter. The elements employed for the calculations are those most usual with Cornish engineers ; and the effective horse-power per stroke is given, that the inquirer may ascertain the total value of horse-power resulting from working any given number of strokes per minute.
Página 303 - ... that neither impetus nor momentum have usually much to do with the action of ordinary machines ; which is undoubtedly true ; since neither of these functions measures directly their efficient power. The criterion of their efficiency is force multiplied by the space through which it acts...
Página 164 - After careful study of the facts with which he became acquainted, he came to the following conclusions :— "That an abundance of water is stored up in the new red sandstone, and may be obtained by sinking shafts and driving tunnels about the level of low water. " That the sandstone is generally very pervious, admitting of deep wells drawing their supplies from distances exceeding one mile.
Página 189 - The boring-head consists of a wrought- iron bar, about 8 feet long, on the lower part of which is fitted a block of cast-iron, in which the chisels or cutters are firmly secured. Above the chisels an iron casting is fixed to the bar, by which the boringhead is kept steady and perpendicular in the hole. A mechanical arrangement is provided, by which the boring head is compelled to move round a part of a revolution at each stroke.