Mechanical Calculators 1600's Blaise Pascal : Pascaline Calculator (1642) Gottfried Wilhelm Leibniz: The Leibniz Wheel (1673) 1630 Puritans establish the Massachusetts Bay Colony 1619 A Dutch Ship brings the first Africans to Jamestown 1690 John Locke publishes Essay Concerning Human Understanding Calculator, courtesy of http://ei.cs.vt.edu Bible, courtesy of http://www.lava.net Aurora Saenz