Navigation was originally the particular branch of naval knowledge to which the Admiralty directed him to devote himself, but early realising the immense part which heavy artillery was to play in modern warfare, Admiral Tudor, as a young man, eventually devoted his entire attention to the study of guns and gunnery. At no time in the history of armaments has such an important development of power, of rapidity of firing and of reliability of guns of all calibre, been known, and this being so, Officers like Rear-Admiral Tudor, who are experts in such matters, are absolutely invaluable to the British Navy. From the very beginning of his career Rear-Admiral Tudor was recognised as an Officer possessing intelligence of a very high order. From 1892 for two years he acted as Experimental Officer, and for a further two years as a Senior Staff Officer of H.M.S. "Excellent," passing to the Department of the Director of Naval Ordnance at the Admiralty in January, 1896, where he remained until May, 1898. In 1902 he became a Captain, and from September, 1906, to May, 1909, he was Assistant Director of Naval Ordnance. [Illustration: VICE-ADMIRAL SIR F. C. T. TUDOR] As Captain of the "Excellent," to which ship he was appointed in August, 1910, Rear-Admiral Tudor did much to promote that proficiency in gunnery which is so vitally essential to the success of all modern naval operations. He held the post for nearly two years, and during that period impressed everyone who came in contact with him with the firm idea that he was the right man in the right place. From April 12th, 1911, to January 14th, 1913, he was Aide-de-Camp to the King, on which latter date he was promoted to Rear-Admiral. On June 12th, 1912, Rear-Admiral Tudor was appointed Director of Naval Ordnance, and on King George's birthday in 1913 he received the C.B. He was Third Sea Lord on the Board of Admiralty from August 11th, 1914, to May 31st, 1917, being mainly responsible for new construction during this period of immense expansion of the Fleet under war conditions. VII ADMIRAL OF THE FLEET SIR GEORGE ASTLEY CALLAGHAN, G.C.B., G.C.V.O.