. Elements of practical agriculture; comprehending the cultivation of plants, the husbandry of the domestic animals, and the economy of the farm. 050 GENERAL ECONOMY OF THE FARM. Sometimes it is convenient that a gate shall shut of itself when opened. A good gate of this construction is represent- ed in Fig. 208. The upper hinge of the gate is fixed to the upmost bar, and is received into a socket in the hinge, as seen at b, Fig. 210. The advantages of making the upper hinge move in a socket are, that while space is given to it to move, it is firmly supported in its place ; and that the means
. Elements of practical agriculture; comprehending the cultivation of plants, the husbandry of the domestic animals, and the economy of the farm. 050 GENERAL ECONOMY OF THE FARM. Sometimes it is convenient that a gate shall shut of itself when opened. A good gate of this construction is represent- ed in Fig. 208. The upper hinge of the gate is fixed to the upmost bar, and is received into a socket in the hinge, as seen at b, Fig. 210. The advantages of making the upper hinge move in a socket are, that while space is given to it to move, it is firmly supported in its place ; and that the means are af- forded of causing it to move smoothly by pouring a little oil into the socket. The lower hinge is formed upon the principle of affording two pivots or points of support to the lower part of the gate. It consists of two iron plates placed horizontally, the one a little above the other, the upper being fixed to the post and the lower to the gate. From the lower part of the upper plate project two small cylindrical pieces of iron, placed perpendicularly as seen at a, Fig. 209. These are received in- to the grooves or hollows of the under plate, so that the gate rests upon the two upright pieces of iron as pivots. The gate, when shut, has thus three points of support, namely, the socket of the upper hinge and the two lower pivots, the former of which is thus placed at the vertex, and the two latter at the base of an isosceles triangle; from which construction it results, that the gate is only in a state of equilibrium when, being shut, it rests upon both the two lower pivots ; when opened accord- ingly it must tend to regain its former position.* Fig. 20&. * Paper by me iu Quarterly Journal of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Low, David, 1786-1859. London : Longman, [etc.
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