Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 510
he floor. As thetrusses were to be in sight, a central cloumn of cast-iron was introduced to sus-tain the centre of the top chord, with lattice between the main diagonals toenable them to act as counters, and a 3|-inch gas-pipe for horizontal bracing-struts. The floor-sustaining rods all have upset… … 49^ ENGINEERING DRAWING. yard, and one plate 12 X f in.ches. The end-posts have the same section.The bottom chord consists of four bars 2|- X 1 inch at the shallow end of the
Mechanical drawing
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