Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 262
end ofthis plank the two other timbers, of equal length to make them if you know the lengthof the bridge? Suppose the bridge were to betwelve feet long. How many of you knowanything about geometry, and how to find thelong side of a right-angled triangle if the shortsides are given, or how to find… … A ONE-POST BRIDGE of 72. This gives roughly Syz feet. You see,all this comes from the proposition that thesquare of the long side of a right-angled tri-angle is equal to the sum of the squares of theother two sides. This kind of bridge, with one post, can bemade twelve feet long, and strong enough…
Children's literature
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