“Ivy Mike,” first US nuclear fusion device, 10.4 - 12 megatons; Nov 1952, Eniwetok Atoll, Pacific Proving Grounds.
Edward Teller, perhaps the most ardent supporter of the development of the hydrogen bomb, was in Berkeley, California at the time of the shot. He was able to receive first notice that the test was successful by observing a seismometer, which picked up the shock wave that traveled through the earth from the Western Pacific test site. In his memoirs, Teller wrote that he immediately sent an unclassified telegram to his colleagues at Los Alamos which contained only the words — for security purposes — “It’s a boy.”
