Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 942
n edge under theweight than if the weight is laid on the side of theboard v/hile the board rests at its ends on sup-ports. And the board will support a still greaterweight if the board is hung up by its upper endand the. weight is hung on its lower end. So a fastened in place by a single bolt at… … FIG. 6. A PAPER-AND-STRING MODEL OFA TRUSS BRIDGE. into the bridge in the way in which they arestrongest. The paper-and-string model, Fig. 6, of thebridge truss is holding a piece of lead-pencil; andit shows that only the four boards that make upthe upper chord of the truss are pushed on bythe…
Children's literature
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