. The book of the garden. Gardening. 18 GENERAL FORMATION, &c, OF GARDENS. instance, will be found the cheapest in the end, as, when once put into operation, it is scarcely possible for them to get out of working order; and hence all the expense of pumping, and the necessary repairs attending it, are dispensed with. Various hydraulic powers might be employed for this purpose : the simplest and best is the Fig. belier hydraulique, or water-ram. We say the best, because it is effective, and of such simple construction as to be scarcely ever out of order, and, when once set in motion, it goes
. The book of the garden. Gardening. 18 GENERAL FORMATION, &c, OF GARDENS. instance, will be found the cheapest in the end, as, when once put into operation, it is scarcely possible for them to get out of working order; and hence all the expense of pumping, and the necessary repairs attending it, are dispensed with. Various hydraulic powers might be employed for this purpose : the simplest and best is the Fig. belier hydraulique, or water-ram. We say the best, because it is effective, and of such simple construction as to be scarcely ever out of order, and, when once set in motion, it goes on incessantly without any external aid, so long as it is supplied with water. Fig. 9 represents this machine, and the following description explains its action :. 0 1 r 1 1 i 1 1 1 1 " Suppose o to represent a cistern or reservoir, or the source of a spring which is constantly overflowing or running to waste, by means of a channel a few feet lower than itself, as at the level line pp. Instead of permitting the water to run over the sides of o, let it be conducted to the level pp by means of iron or other pipes, q q, connected with the side of the reservoir, and terminating by an orifice, r, in which a conical or other valve, s, is placed, so as to be capable of effectually closing the pipe when such valve is drawn upwards : t is an adjustable weight fixed on to the spindle of the valve s, by means of which the valve is kept down and open; any water, therefore, that is in the cistern o, will flow down the pipe q q, and escape at the orifice r, so long as the valve re- mains down; but the instant it is raised and shut, all motion of the water is sus- pended. Thus situated, the adjustment of the weight t must take place; and by adding to, or subtracting from it, it must be made just so heavy as to be capable of sinking or forcing its way downwards against the upper pressure of the water, the force of which will depend upon the perpendicular distance from the surface of the
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
