10 key historical energy events By tpni4sadie Jan 1, 1698 First Steam Engine Invented Jun 15, 1752 Lightning Jan 31, 1791 Bioelectricity Jan 1, 1821 Electric motor Jan 1, 1823 Internal combustion Jan 1, 1824 Heat Engines Jan 1, 1835 Telegraph Sep 1, 1960 Ruby laser Jan 1, 1971 Battery Jan 1, 1972 Geothermal Energy
