Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 472
FlG. 1070. Scale : ro = 1 foot. Fig. 1072 is a plan and elevation of pintal for heel-post of lock, with a sec-tion of the bottom of the post. The pintal is imbedded in bottom timber orstone, as the case may be.
Mechanical drawing
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