is inconsi)icuous. In rough woik. tbe screw may be driven into ])lace witb a ham-nui tbiu luost of its length, and then a few tinal turns be givenwitb a sci-ew(lri\(r. but tbis brinks tlu tibeis of tlu wood and weaken^tbeir bobl. \\\ -(Irive-scicws. Fig. ll\\ c tlu: slot is not cut al tbewav across… … Fifr. 22^>. a. Flat-head Wood-screw, b. Round-head Wood-screw. c. FiUister-head Wood-screw. d. Oval-couiitersunk-head Wood-screw, e. Drive-screw, f. Square-head (lag-or coach-) Screw. WOOD FASTE^riXGS. 127 retighteiied. The disadvantages are, that they are expensive, thatthey take time to…
Woodwork
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