Page:Willich, A. F. M. - The Domestic Encyclopædia (Vol. 3, 1802).djvu/442

42o]' PbK dimensions above stated, are com-' puted to be from 41. to 6i. accord- ing to the distance from vhicii the clay 13 carried. Such a pond will j-pmaiu unimpaired for a series of years; "because the lime prevents worm^frora strikingeither upwards or downwards, and conseqiieutly from injuring the clay, which rra- turally resists moi.Uure. Beside the utility of pond.s, by affording a cnnst::int iU^iply of wa- ter for vari-jMs jiujiToses, the Mud settling at the bottom fumisbes an excellent manure. Hmice it is a liesirahle object to draw off the fluid part, so as conveniently to ar- rive at the sediment : for this pur- pose, a hole or pit shovild b-^ dug' in the centre of the pond, as far as the stratum of sand, which usually, lies under that of clav. Thus, the water will be immediavely absorb- ed, and the pond completely emp- tied : — the sides of the cavity, however, ought not to lie made so steep as' to pi'eveuf iie return of cattle, in case they should enter it by accident. In the 8th vol. of the Transac- iiovs of the Society for the En- couragement of Arts, &:c. we find a short account of a Machine fon- draining Ponds, without disturb- ing the mud. It was communi- cated by I.ieutenant-Colonel Dan- SEY, together with a drawing and model, of which we have given an engraving. Hg, 1. A, is the pipe, loaded with a rim of lead, of such a weight as serves to sink it beneath the sur- face of the water. B, represents the discharging pipe, that is laid through the bank H, I. C, the joint on whlcli the pipe A, turns ; and the form of which ii delineated in Fig. 2. PON' ' D, the ball, or float, that swim«i on the surface of the pond, and thus prevents the pipe A from de- seeiiding to a greater depth than the lengtl". of the chain, by which they are conncfted, will admit, K, a chain that winds on the windlass F ; and serves to raise the tube A, above ilie surface of the water, when the machinery is not in use. G, a stage. H, I, til." bank, which is repre- sented as if it were cut through at I, in order to delineate the lube B, lying M'ithin it. K, is a post designed for the re- ception of the pipe A, when the latter i5-]owered, and also for pre- venting it from sinking in the mud. fig. 1. A, is a cast cylinder, fur- nished with a brass plate or cheek, which is fastened to the timber of the tube, on one side only ; be- cause the part of the cylinder C, turns in the hollow <^ the wooden tube, when it is immersed in the water. A piece of strong sole- leather is placed in the inside of Such plate, to prevent leaking. The model represented in our engraving, was construtSted from the description of a machine em- ployed by a gentleman residing in the vicinity of Taunton. In the year l/SS, Colonel Daxsey's re- giment was quartered at Windsor; and, conceiving that the invention might be useful for the supply of the grand cascade at Virginia-Wa- ter, he presented the model before- mentioned to His Majest}', who graciously signified his approbation. In consequence of this event, a pen-Slock was eredted on the same plan, at one of the ponds in the vi- cinity. Colonel