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For these societies, due to this fact, and for the numerous millennia of earlier unrecorded historical past by which sluggish but substantial technological advances have been made, it’s essential to rely closely upon archaeological proof. The historian of technology have to be ready to use all these sources, and to call upon the talents of the archaeologist, the engineer, the architect, and different specialists as appropriate. Inventions have foundered because the social sources vital for their realization—the capital, supplies, and expert personnel—were not out there. The notebooks of Leonardo da Vinci …