Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 509
, 1 ridge-iron, each 0-46 deep, 17*2 long 2,985 Bolts for the same , 64 16 jack-rafters, I-iron, 0-16 deep 2,489 Weight of iron covering, including laps, per square foot 2*88 Roofs are sometimes made with deep corrugated main rafters with flat ironbetween, or purlins and corrugated iron for the… … Fig. 1174. than boiler-houses or depots, except a ceil-ing be made below to prevent the contactof the air inside with the iron. Fig. 1176 is an elevation of one of thej^ three panels of one of p^=J]^p=pzzi the cast-iron girders for connecting the columns, and carry-/^biiflf ^Qi ^ ing the transverse…
Mechanical drawing
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