ENGINEERING WORKS , ETC . 1039 The framing had therefore to be adapted to this Variation . It is sufficiently rigid to resist the influence of a moving load , and dis - tribute it over 100 feet of the platform ; but it is not too rigid … Fig . 724 . — Platform , side elevation . to yield fairly to the necessary changes in the position of its centre . The platform is wonderfully stiffened by a light , yet strong , reti - culated truss on either side , 6 ^ feet deep , going down 2 feet below the road , and rising 4 ^ feet above it ,…
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