Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 941
SUPPORTED. bit of material in a truss bridge is put in the verybest position to enable it to use its strength to thegreatest advantage. I will try to make this clear.You will notice that the sides, or trvisses, ofthe bridge are made up entirely of triangles, orthree-sided figures. There is an… … FIG. 4. THE COLLAPSED FOUR-SIDED FRAME. out changing its shape. The first picture of thefour-sided figure, Fig. 3, shows that the boards iy07.] A BOYS OWN BRIDGE 921 must be held up to keep them from shutting up board will stand more strain if it is pulled, orby their own weight, while the second…
Children's literature
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