science By maryruth.dodes May 6, 1701 bifocals May 6, 1701 seed drill Period: May 6, 1701 to May 6, 1750 science French C. Hopffer patents the fire extinguisher May 6, 1709 piano May 6, 1711 tuning fork May 6, 1712 steam ingine May 6, 1717 diving bell May 13, 1722 French C. Hopffer patents the fire extinguisher French C. Hopffer patents the fire extinguisher May 6, 1731 circulating library May 13, 1733 John Kay invents the flying shuttle May 6, 1744 celcius thermomoter
