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One Good Turn: A Natural History of the Screwdriver and the Screw One Good Turn: A Natural History of the Screwdriver and the Screw
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Tim Robinson
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One Good Turn: A Natural History of the Screwdriver and the Screw

Hazard
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Hazard
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Hazard
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Jonathan
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Jonathan
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Jonathan
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One Good Turn: A Natural History of the Screwdriver and the Screw

Elizabeth
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The problem lay in the manufacturing process. Blunt screws could not simply be filed to a point- the thread itself had to come to a point, too. But lathes were incapable of cutting a tapering thread. Screw manufacturers tried angling the cutters, which produced screws that tapered along their entire length. Such screws had poor holding power, however, and carpenters refused to use them. What was needed was...
Dec 20, 2011 10:45AM Add a comment
One Good Turn: A Natural History of the Screwdriver and the Screw

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