. 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. 509. 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
. 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. 509. 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
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1871
