. The book of the farm : detailing the labors of the farmer, steward, plowman, hedger, cattle-man, shepherd, field-worker, and dairymaid. Agriculture. 264 THE BOOK OF THE FARM SUMMER. head-post in a vertical direction, cither or downward, short of what will fracture the gate ; and the point f. whore the diaifonals cross each oilier at the center of the gate, becomes alao immovable in the plane of the truss; hence the perpendicular bar/e g, being riveted to the. V'l"ln|"j. THE FIELD-GATK WITH FRAME-WORK. diagonal at e, acquires the same property, and by attachiner
. The book of the farm : detailing the labors of the farmer, steward, plowman, hedger, cattle-man, shepherd, field-worker, and dairymaid. Agriculture. 264 THE BOOK OF THE FARM SUMMER. head-post in a vertical direction, cither or downward, short of what will fracture the gate ; and the point f. whore the diaifonals cross each oilier at the center of the gate, becomes alao immovable in the plane of the truss; hence the perpendicular bar/e g, being riveted to the. V'l"ln|"j. THE FIELD-GATK WITH FRAME-WORK. diagonal at e, acquires the same property, and by attachiner all the horizontal bars Xofe e at their several crossings, each of them is rendered permanent in its position at that point, and no force short of breaking down the gate can bend any of the parts upward or downward in the direction of the bar/e ^, so long as this last remains attached to the crossing of the diagonals at e. In or- der to give farther support to the horizontal bars by the principle of construction, we have only to take a point where a diagonal crosses a bar, as at h. forming the opposite triangles e k i and ah k, which, when the bar and diagonal have been connected, become also immutable, and the perpendicular bar / h m being secured to the point h, and again to the different bars at their in- tersection with / h m, the whole are again rendered immovable as in the middle. The support given to the horizontal bars in the line / h m. would have been still more complete if there had been only one intermediate bar below the middle one, as the three parts would then have met in one point, as they do at /(, but two bars arc introduced to render the gate fencible for sheep of all ages. The perpendicular bar n o p \s applied on the same principle as laid down for I h m, the point of support in this case being o. (1977.) Ill this construction of gates, the greatest possible amount of mutual support among the parts is obtained with a given quantity of materials ; hence gate
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectagriculture, bookyear
