chapt. 7 timeline By 16adunbar May 10, 1752 franklin invented lightning rod May 10, 1764 spinning jenny May 10, 1775 steamship May 10, 1776 submarine May 10, 1786 steamboat May 10, 1791 gas turbine May 11, 1809 first electric light May 11, 1825 electromagnet May 13, 1825 first mechanical May 11, 1829 typewriter May 13, 1837 telegraph May 13, 1851 sewing machine May 13, 1867 modern May 13, 1868 traffic lights May 13, 1886 dishwasher May 13, 1891 escalator May 13, 1901 air conditioner May 13, 1904 tractor May 13, 1907 first synthetic May 16, 1912 movie camera
