Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 553
e poling, and driving into this space the new poling-boards (i. e., the ones shown in Fig. 1273). Though the wedges between thecollar and the poling-boards serve well enough to keep back the material, itwould be dangerous thus to take any of them out were there no other guardfor the poling, as the… … 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…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
