Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 53
the qualities of a first-class board. Itis made of pine wood, glued up to therequired width, with the heart side ofeach piece of wood at the surface. Apair of hard-wood battens are screwed tothe back, the screws passing through the ledges in oblong slots that are bushedwith brass, which fit closely… … Fig. 114. DRAWING INSTRUMENTS. 37
Mechanical drawing
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