Round nails supplanted square nails; welding is taking the place of rivets. Yet brash would seem the man who would change the other vital method of joining parts to parts, the nut & bolt. As old as the Christian era is the principle of the screwthread, discovered by Archimedes, elaborated by Hero of Alexandria. But bolting is far from perfect. Vibration shakes loose the tightest of nuts, and just as for want of a nail the battle was lost, many a time for want of a bolt the airplane has crashed, the train has...
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