l of the Vignoles weight to carry, it will need four tie rods of one inch diame- section, flanked on either side at a distance of about 20 inches ter, one placed at 30 inches from each end of the arch, and with timber longitudinal sleepers, the three being secured to by practice and by laying down… … the rod passing through the center of the depth of the arch earth coincides with its third principal axis, and its poles of at the face of the skewback. This skewback may be made of rotation always correspond very nearly to the same point of line run engines and carriages having one pair of broad…
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