Can anyone here point me toward an authoritative history of
hex head nuts and bolts? I see square nuts and bolts in old
machinery and tools in museums, but I don't think I've seen
a hex head nut or bolt in anything built before 1900. Does
anyone know who invented/developed the hex head nuts and
bolts? When, where, why, etc? Any info on this topic
appreciated.

Many thanks.

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CWLee
"If elected, my highest priority upon taking office will be
to get the gazelles and the lions to negotiate a peaceful
solution to their long-standing differences." Tarzan,
Democratic candidate for King of the Jungle.