Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 264
s, of equal length. The first part on eachside is a triangle, like the half of the triangleof the one-post. And to get the length of thelong side of this triangle (the slanting side isthe long one in this case), you square twothirds of the length of the bridge, divide bytwo and take the square root… … the square of 8 is 64; half of 64 i? 32, andthe square root of 32 is, roughly, 5 feet 7 inches.Diagram B gives a better idea than can begiven by words. Such a bridge is quite strong.And you make the floor in the same fashion,only now you have tzvo posts on each side, sothere must be hvo extra-long…
Children's literature
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