This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ... fixed to a bed-plate, fastened to a chain n g n secured to two anchors N N', or may travel laterally on rails. In the first case, a beam N (Fig. 38), 8ft.6in.x4ft.3in.in section, and 3ft. 3in. at least in length, is buried in a trench 12 inches deep; behind this beam, and in a slanting direction, two pegs p are driven ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ... fixed to a bed-plate, fastened to a chain n g n secured to two anchors N N', or may travel laterally on rails. In the first case, a beam N (Fig. 38), 8ft.6in.x4ft.3in.in section, and 3ft. 3in. at least in length, is buried in a trench 12 inches deep; behind this beam, and in a slanting direction, two pegs p are driven into the ground, in such a manner that the points be further apart than the heads, a gudgeon B passed through a ring of the chain n rests behind the pegs, the traction of the chain being rendered even on the beam N. If we study Plate I. again, we see that when working, the capstan A exerts a traction on g in the direction of arrow 2, equal to the sum of the resistances of the plough C and the cable t. This traction is divided on the two pieces g n and g n' of the chain n-ri, the result being a tendency to bring the anchors N and N' closer together, exerting a compressing action on the soil, which under these conditions offers great resistance. Certain implement makers replace the beam by a wroughtiron plate, the principle remaining the same. Guyot now uses the anchor shown in Fig. 39, consisting of a steel ring A lying flat on the ground, and kept in place by four pegs P strapped on the ring at B, the traction chain C passes over the ring. With this arrangement the pegs blocked by the straps cannot lean, and offer great resistance to the traction f without requiring the ramming of the soil necessary when using a beam. (Price of anchors and Fig. 38.--Anchoring Beam. chain, 5.) We may also adopt the mode of pegging used by military engineers. The pegs A (Fig. 40), are made of pine wood, they are 3 to 4J inches in diameter, terminated by a square point, provided with an iron shoe S, the other end furnished with an iron hoop F. At the foot ...
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