Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 596
Fig. 1404- wide (Fig. 1405), called caniages. Sometimes the strings, instead of beingnotched out to receive the steps, have the upper and lower edges parallel, with grooves cut in the inner faces toreceive the ends of their steps and … Fig. 1405.
Mechanical drawing
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