Length, 7 feet.
Height, 1 foot.
Width, 1 foot.
Chords, 4--1/4 x 1/2 inch.
Braces 4--1/4 x 1/8 "
Lattice, 1/4 x 1/16 "

This represented a span of 150 ft, a rise of 20 feet, and a panel
of 15 ft. Weight, per running foot of bridge and load, was taken
at 3000 lbs.

The method of calculating the dimensions of this truss, from the
foregoing data, is as follows. The half number of panels is 5, and the
lengths of the corresponding diagonals (neglecting fractions) are

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/20² + 15² = 25 feet. [TeX: $\root{20^2 + 15^2} = 25$]
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/20² + 30² = 37 " [TeX: $\root{20^2 + 30^2} = 37$]
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/20² + 45² = 49 " [TeX: $\root{20^2 + 45^2} = 49$]
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/20² + 60² = 64 " [TeX: $\root{20^2 + 60^2} = 64$]
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