June 10 
1836: Andrι-Marie Ampθre, after whom the unit of current is named, died. 1854: Bernhard Riemann proposed that space is curved. 1854: The U.S. Naval Academy in Annapolis, MD, held its first graduation. 1909: The SOS distress signal was used for the first time by the Cunard liner SS Slavonia when it wrecked off the Azores. 1932: Artificial lightning using 10 MV was demonstrated by GE. 1940: Italy declared war on France and Britain; Canada declared war on Italy. 1943: The ball point pen was patented by Laslo Biro. 1952: Mylar became a registered trademark for DuPont's extraordinarily strong polyester film. 1977: Apple Computer shipped its first Apple II. 1996: Intel released the 200 MHz Pentium. 2000: The Millennium Bridge, a footbridge across the River Thames, was opened by Queen Elizabeth. | 
