Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 596
Fig. 1405. … Fig. 1406. risers (Fig. 1406). These are called housed strings. Steps and risers are se-cured in the grooves by wedges covered with glue, and driven in. For therough, strong strings of warehouses the carriages are made of plank, withgrooves to receive plank-treads, and without risers. Figs. 1407…
Mechanical drawing
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