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numbers, materials, non-metals

InventTable — NUMBERS ERA — Materials, non-Metals

InventionDescriptionYearInventorCountry
Clear glass windows, lenses 500 AD Angelo Barovier Italy
Toilet paper improved hygiene 589 AD China
Porcelain high quality ceramic 700 AD China
Eyeglasses corrective optics 1000 AD China
Magnifying glass optics 1250 AD Roger Bacon England (UK)

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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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