Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 264
ide is divided intofour parts, so that when you want to find thelength of the slant sides of the end triangles. you must square half the length of the bridgeand proceed as before. Suppose the bridgeis to be 20 feet long. Half of this is 10.This squared is 100. Half of this is 50, andthe square root… … A THREE-POSTER. THE SIDES A LITTLE FLAT. AS THE MATERIAL IS HEAVY I hardly have to explain how to go aheadwith this bridge—it is all so simple. The toptimber connecting the tops of the end trianglesis half the length of the bridge. And it is fromthe center of this that the third post connectsthe…
Children's literature
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