Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 350
Fig. 721. Fig. 722. To strengthen the pin, blocks are inside-strapped (Fig. 724), or withwrought-iron straps or malleable-iron shells (Fig. 725) and cast-iron sheaves,entirely without woodwork. Most blocks (Figs. 724 and 725) have becketsattached. In the Appendix will be found a table of the…
Mechanical drawing
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