Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 114
enters for fastening pieces of metal on wood, or one piece of wood toanother, is a specimen of the screw with which everybody is familiar. Theprojection which winds spirally round the nail is termed the thread of thescrew, and the distance that the thread advances parallel to the axis inone turn is… … Fig. 28.— WhitworiKs Screw Dies and Tap. and projections. Screws are formed on the ends of the bolts, by whichvarious parts are fastened together, and the hollow screws which turn onthe ends of the bolts are termed tiuts. The screws on bolts and nuts, andother parts of machines, were formerly made…
Inventions
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