The Steam Engine and other Heat Engines around this time. In 1897 he took part in the sea-trials of the experimental vessel Turbinia, which set a new speed record of 35 knots. In 1898, Ewing took his wife and children to Switzerland for a mountaineering holiday with the family of noted Professor of Electrical Engineering at King's College, John Hopkinson. All five of the Hopkinson brothers were members of the Alpine Club and soon initiated Ewing into the sport of rock climbing. On 27 August, John Hopkinson set out with his son Jack and two of his three daughters to climb. Ewing decided not to go with them as he was feeling a little stiff after his climb the previous day. The party never returned, and was found the next morning, all four bodies roped together five hundred feet below the summit. In 1898 Ewing was elected to a Professorial Fellowship at King's College. Admiralty On 8 April 1903, The Times announced that the Board of Admiralty selected Ewing for the newly created post of Director of Naval Education (DNE) in Greenwich. He married Anne Maria Thomasina Blackburn Washington on 14 May 1879 in Tokyo, Japan. She was a descendant of President George Washington's brother John Augustine Washington. Ewing's first wife, Annie (née Washington) died in 1909 and, in 1912, he married Ellen, the surviving daughter of his old friend and patron, John Hopkinson. He had two children with his first wife: Maud Janet Wills, née Ewing (20 May 1880 – 27 April 1952) and Alfred Washington Ewing (1 November 1881 – 5 December 1962). As reward for his services, Ewing was made Companion of the Order of the Bath in 1906 and then Knight Commander of the Bath in 1911. During World War I, from 1914 to May 1917, Ewing managed Room 40, the Admiralty intelligence department of cryptanalysis, responsible predominantly for the decryption of intercepted German naval messages. In this capacity, he achieved considerable fame in the popular press when Room 40 deciphered the Zimmermann Telegram in 1917 (which suggested a German plot to assist Mexico in recovering the southwestern United States). The publication of the Zimmermann Telegram is generally credited as the trigger event which brought American into the Great War. University of Edinburgh In May 1916 Ewing accepted an invitation to become Principal of the University of Edinburgh, in the course of which he instituted an