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Print — Metals

InventTable — PRINT ERA — Materials, metals

InventionDescriptionYearInventorCountry
Metal screw 1450 AD Europe (65)
Insulated copper wire for electricity 1827 AD Joseph Henry USA (12)

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Leo Dean Jansen

Leo Dean Jansen, MD is a retired orthopedic surgeon with a special interest in the history of technology.  This web page is the culmination of  his efforts to define and organize the history of technology as seen through 2000 inventions.  TECHNOLOGY:  TABLE, TRUTHS, TIMELINE, TOP 100 represents the 4 parts of this project.

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