Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 553
Fig. 1275. Fig. 127 off; in any event, it would be a matter of great trouble to get them wedged upagain. In order to guard against this trouble, a cross-board or plank a (Fig.1274) is placed just under the poling-boards, and over the wedges. Then, whenone wedge is removed, this cross-connection… … Fig. 1277.
Mechanical drawing
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