. Il dizionario di arti, scienze e manufatti ... abbracciando in tutti quasi tremila articoli su arti e scienze. Ng acqua, e dopo il riempimento della scatola G, l'acqua è forzata da lì in thepipe N, E scenda dal beccuccio in O. così, mentre la pistola scende, forza l'acqua sotto di essa fino al condotto e ; e, salendo, forza l'acqua sopra di esso fino al condotto F; La pressione dell'atmosfera che riempie il cilindro-pompa sotto il pistone,attraverso il tubo B, mentre lo stantuffo sale, e riempiendo ilcilindro con acqua sopra il pistone attraverso il tubo CS, mentre lo stantuffo scende. Da

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. The dictionary of arts, sciences and manufactures ... embracing in all nearly three thousand articles on arts and sciences. ng water, and afterfilling the box G, the water is forced up from thence into thepipe N, and runs off by the spout at O. Thus as the pistondescends, it forces the water below it up the pipe E ; and as itascends, it forces the water above it up the pipe F; the pres-sure of the atmosphere filling the pump-barrel below the piston, through the pipe B, while the plunger ascends, and filling thebarrel with water above the piston through the pipe CS, as theplunger goes down. By this means, as much water is forcedup the pipe N, to the spout O, by the descent of the piston asby its ascent; and, in each case, as much water is dischargedat O, as fills that part of the pump-barrel in which the pistonmoves up and down. On the top of the pipe O is an air-vessel P. When thewater is forced up above the spout O, it compresses the air inthe vessel P; which of course acts by its elasticity as in theair-vessel of the forcing pump already described. OMiid ; iv. r! 11 . i v; vv ILATJL II.. HYDROSTATICS AND HYDRAULICS. 119 Hydraulics- De la Hires pump.—Archimedes screw. Whatever may be the height of the spout O above the sur-face of the well, the top S, of the pipe CS, should only be 24or 25 feet above the surface; for though the pressure of theatmosphere, in case the pipe w^re perfectly exhausted, wouldraise the water higher, yet as a perfect exhaustion can scarcelybe attained, to make it longer would be running the risk- ofimperfect action. It is not very material what the size of the pipe N may be, through which the water is forced into the spout; but muchdisadvantage may be incurred, by an injudicious proportionof the working-barrel; according to the height of the spout O, above the surface of the well, the diameter of the bore of thebarrel should be as follows: Height in feet to Bore of the which the water is barrel in to be raised. inches. 10 6.9 15 5.6 20 4.9

Parole chiave associate all'immagine

• bookcentury1800
• booksubjectindustrialart
• booksubjecttechnology