This collection includes the official and private log books he compiled during the period while he was a midshipman, with fine plans and sketches, perhaps the most interesting of which are those relating to the Dardanelles campaign. The collection also contains a number of photograph albums showing the life of these very young officers - Clarke and his contemporaries - during this period. The collection is completed with Captain Clarke's two-volume biography which describes, as well as his World War I experiences, the next forty years of a full and varied career which took him all round the world and ended with nine years as Chief of Naval Information.