of Rosario University in Argentina. June 17–18 – Aviator Amelia Earhart becomes the first woman to make a successful transatlantic flight, as a passenger in a Fokker F.VIIb/3m piloted by Wilmer Stultz, from Newfoundland to Wales. June 20 – Puniša Račić kills three opposition representatives in the Yugoslavian Parliament, and injures three others, in a gun attack. June 24 – A Swedish aeroplane rescues some survivors of the Italian North Pole expedition, including Umberto Nobile. The Soviet icebreaker Krasin saves the rest July 12. June 28 The keel of the first 1,000 ft (300 m)-long ocean liner, Oceanic, for the British White Star Line, is laid by Harland and Wolff in Belfast; construction is delayed, and cancelled on 23 July 1929. The International Railway (New York–Ontario) switches to one-man crews, for its trolleys in Canada. June 29 – At the 1928 Democratic National Convention in Houston, Governor of New York Al Smith becomes the first Catholic nominated by a major political party for President of the United States. July July 2 – Charles Jenkins Laboratories' W3XK station begins broadcasting on 6.42 MHz, using 48 lines. July 3 – Scottish inventor John Logie Baird demonstrates the world's first colour television transmission in Glasgow. July 7 – The first machine-sliced and machine-wrapped loaf of bread is sold in Chillicothe, Missouri, United States, using Otto Frederick Rohwedder's technology. July 17 – José de León Toral assassinates Álvaro Obregón, president-elect of Mexico. July 25 – The United States recalls its troops from China. July 27 – Radclyffe Hall's highly controversial novel The Well of Loneliness, with a theme of lesbian love, is published in London, UK. July 28 – August 12 – The 1928 Summer Olympics are held in Amsterdam, opening with the lighting of the Olympic flame. Women's athletics and gymnastics debut at these games, and discus thrower Halina Konopacka of Poland becomes the first female Olympic gold medal winner for a track or field event. Coca-Cola enters Europe as sponsor of the games. August August – Margaret Mead's influential cultural anthropology text, Coming of Age in Samoa, is published in the U.S. August 2 – Italy and Ethiopia sign the Italo-Ethiopian Treaty. August 16 – Serial killer Carl Panzram is arrested in Washington, D.C., for burglary. Later it will be discovered that he has committed multiple murders, rapes and other major crimes. August 22 – Al Smith accepts the Democratic nomination for