Important Inventions By gagetucker Aug 14, 1499 Leonardo da Vinci invented moveable barracades Jul 12, 1564 Nicholas Conte invented the graphite pencil May 3, 1593 Galileo Galilei invented the thermometer Oct 12, 1608 Hans Lippershey invented the refracting telescope Dec 13, 1632 W. Oughted invented the sliding ruler Dec 19, 1663 James Gregory invented the reflecting telescope Oct 12, 1720 Bartolomeo Cristofor invented the piano Aug 12, 1756 Duke de Rechelieu invented mayonnaise May 12, 1775 Count Alessandro Volta invented the chemical battery Jun 20, 1793 Eli Whitney invented the cotton gin to clean cotton quicker Feb 10, 1814 Charles and Vincent Chevaler invented the camera May 11, 1836 Samuel Colt invented the colt revolver Jul 11, 1861 Richard Gatling invented the first machine gun May 11, 1879 John Brownig invented the pump action shotgun Jun 11, 1903 Orville and Wibur Wright invented the airplane Oct 18, 1923 Philo Farnsworth invented the television Sep 16, 1947 Dr. Jonas Salk invented the polio shot Jan 15, 2001 Steve Jobs invented the iPod
