. An encyclopædia of agriculture : comprising the theory and practice of the valuation, transfer, laying out, improvement, and management of landed property, and of the cultivation and economy of the animal and vegetable productions of agriculture. 3107. Parkers sympathetic park-gate {Jig. 510.) is an ingenious contrivance, by which, on the approachof a carriage, the gate opens apparently by its own volition, and closes again after the carriage has passedthrough, without any apparent cause. The manner in which this extraordinary effect is intended tobe pro-duced L by small plates let into the
. An encyclopædia of agriculture : comprising the theory and practice of the valuation, transfer, laying out, improvement, and management of landed property, and of the cultivation and economy of the animal and vegetable productions of agriculture. 3107. Parkers sympathetic park-gate {Jig. 510.) is an ingenious contrivance, by which, on the approachof a carriage, the gate opens apparently by its own volition, and closes again after the carriage has passedthrough, without any apparent cause. The manner in which this extraordinary effect is intended tobe pro-duced L by small plates let into the ground at short distances from the gate, and when the carriage wheelsroll over them, they are made to descend like a weighing machine, and to act upon certain levers concealed. in a trunk under the road, by means of which a toothed wheel is made to revolve, and to turn a toothedpinion affixed to the swinging-post or axle of the gate, and hence to throw it open or close it (NewtonsJournal, vol. xiv. p. 225.) In an agricultural point of view, this gate is of no use; but as a curiosity it isworth noticing, and perhaps in the drives or ridings in somt pleasure-grounds and parks it might be worthexecuting. In England it might save the tax on a groom, and in America and Australia it might be asgood as a helper, which, for such aids as opening gates are not very easy to be found. 3108. Stiles are contrivances for man to pass over or through fences, without the risk of even permitting the larger quadrupeds to accompany or follow lum. There are many forms perfectly well known every where: as by steps over a wall ; by a zig-zag passage, formed by stakes, through a hedge or paling; a turning-bar or turnstile, &c. 31C9. The stile of falling bars (fig. 511.) is chief
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1871
