Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 508
O O « • O O Fig. liro. Fig. 1171. iron roof, consisting of main rafters, E, of the I-section (Fig. 1175), trussed bya snspension-rod, and tied by another rod. The purlins are also of I-iron, se-cured to-the rafters by pieces of angle-iron on each side ; and the roof is cov-ered with either… … from purlin to purlin. Tlie rafter-shoe. A, and the strut, S, are of cast-iron ; all the other portions of the roof,are of wrought-iron. In Ameri-can practice it is usual to make the strut of wrought-iron, with a singlepin connection at its foot, instead of as in the figure.The surface covered by…
Mechanical drawing
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