1922 Eskimo Pie patented by Christian K Nelson of Iowa (not an Eskimo)
1840 1st deep sea sounding by James Clark Ross in south Atlantic at 2425 fathoms (14,450 feet)
1870 Construction begins on Brooklyn Bridge in New York; completed May 24, 1883
1872 1st patent list issued by US Patent Office
1859 1st steamboat sails, Red River
1892 1st successful auroral photograph made
1933 Work on Golden Gate Bridge begins, starting on the Marin County side
1839 Thomas Henderson measures 1st stellar parallax (Alpha Centauri)
1968 Surveyor 7 space probe soft lands on Moon
1986 After losing a patent battle with Polaroid, Kodak must give up its instant camera business.
1773 First public museum established in north American colonies (Charlestown, SC)
1839 Anthracite coal 1st used to smelt iron, Mauch Chunk, Penn
1896 1st X-ray photo in US (Dr Henry Smith, Davidson NC)
1535 Francisco Pizarro founds the city of Lima in Peru
1840 The Electro-Magnet, and Mechanics Intelligencer, 1st US electrical journal, appears
1896 1st demonstration of an X-ray machine in US (NYC)
1849 US Patent granted for an envelope-making machine to Jesse K. Park and Cornelius S. Watson
1909 1st radio rescue at sea
1970 US launches 2nd generation weather satellite, ITOS 1
1799 1st US patent for a seeding machine, Eliakim Spooner, Vermont
1825 1st US engineering college opens, Rensselaer Polytechnic, Troy, NY
1870 Soda fountain patented by Gustavus Dows