Rudimentary Treatise on the Drainage of Districts and LandsJohn Weale, 1849 - 142 |
Inne wydania - Wyświetl wszystko
Kluczowe wyrazy i wyrażenia
acres admitted adopted Ancholme apparatus applicable argillaceous arrangement Artesian artificial boring Cambridgeshire capillary action carbonic acid catch-water drains chalk channels clay consists constructed cost cubic feet cylinder deep drains deposited diameter discharge distance DISTRICTS AND LANDS Ditto drainage water duated duct earth effect embankment engine evaporation fall felspar filled filtering fitted formed gallons GLENTHAM gravel Grenelle height Humber inches iron irrigation laid lake layer Leeghwater less Littleport loose stones lower main drains materials means methods miles minor drains natural supply necessary open drains particles passage peat pipes piston plough porous proportion pumps purpose quantity of rain quicklime raised Rennie reservoirs river river Ancholme river Nar River Trent rood sand settling reservoirs shown in fig side sluices soil soles and tiles space spade springs steam stone drains strata stratum subsoil subterranean supply of water surface tides tubes upper vegetation wrought iron
Popularne fragmenty
Strona 35 - To understand the nature of the process, it will be necessary to advert, in a general way, to a few long-known chemical properties of the familiar substance chalk ; for chalk at once forms the bulk of the chemical impurity that the process will separate from water, and is the material whence the ingredient for effecting the separation will be obtained. " In water, chalk is almost, or altogether insoluble ; but it may be rendered soluble, by either of two processes of a very opposite kind. When burned,...
Strona 90 - Vesuvius may be considered as the type of a fertile soil, and its fertility is greater or less in different parts, according to the proportion of clay or sand which it contains. " The soil which is formed by the disintegration of lava cannot possibly, on account of its...
Strona 113 - ... having forced it down about four feet below the bottom of the trench, on pulling it out, to his astonishment, a great quantity of water burst up through the hole he had thus made, and ran down the drain.
Strona 14 - The cause of rain, therefore, is now, I consider, no longer an object of doubt. If two masses of air of unequal temperatures, by the ordinary currents of the winds, are intermixed, when saturated with vapour, a precipitation ensues. If the masses are under saturation, then less precipitation takes place, or none at all, according to the degree. Also the warmer the air, the greater is the quantity of vapour precipitated in like circumstances...
Strona 35 - ... but it must combine with seven additional ounces of that acid. In such a state of combination chalk exists in the waters of London — dissolved, invisible, and colourless, like salt in water. A pound of chalk, dissolved in 560 gallons of water by seven ounces of carbonic acid, would form a solution not sensibly different in ordinary use from the filtered water of the Thames in the average state of that river.
Strona 57 - Virgin, in the year above said; before whom the jury then presented, that one Geffrey Gaddesby, late Abbot of Selby, did cause a strong sluice of wood to be made upon the river Trent, at the head of a certain sewer, called the Mare-dyke, of a sufficient height and breadth for the defence of the...
Strona 20 - ... particles, but all of a highly tenacious kind ; in a state of slight moisture, it becomes a clammy paste, and is never found so utterly devoid of moisture that its constituent particles are separable ; it affords no passages for water, receiving it with difficulty, and retaining it in the same way. 2. In the form of sand or gravel, the particles of which are seldom or never united, and the soil is, therefore, full of passages or canals for water. Soil of this kind has no power either to oppose...
Strona 112 - This he begun to do, in 1764, in a field of wet clay soil, rendered almost a swamp, or shaking bog, by the springs which issued from an adjoining bank of gravel and sand, and overflowed the surface of the ground below. To drain this field...
Strona 19 - The precise quantity of water required for the agricultural purposes of any district depends upon the nature of the soil and the crops, and the position of the district in relation to the surrounding country. Thus, if a permeable soil occupy an elevated site, the water deposited upon it will pass rapidly, and, perhaps, before serving for the germination or nutriment of the plant. If, on the other hand, as is the far more common case in this country, the soil be of a retentive character, and the site...
Strona 36 - Any lime-water may be mixed with another, and any solution of bicarbonate of lime with another, without any change being produced. The clearness of the mixed solutions would be undisturbed. Not so, however, if limewater be mixed with a solution of bicarbonate of lime.