Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 269
T if^ Fig. 517. … are tapped to receive them ; Fig. 522 is button-headed ; Fig. 523 a counter-sunk head—both slotted to admit of driving by a screw-driver. They are madeof various-sized wire and lengths, and sold by the gross like the common wood- !■ P Li iH Fig. 519. J \ J f\l ( ? Ill ■4 /; LLZi U 2.2S —^ Fig. 520.…
Mechanical drawing
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