46pp. used. Bears title 'Practical notes on service advise'. Contains notes re equipment, 'maintenance of accumulators', testing, radio telegraphy etc, drawings (of quench gap transmitter, charging boards etc) and two Marconigrams (dated 1945 Sept). /2 letter, 1953 Feb 23, Air Service Training Ltd (school of Marine Radio & Radar), Hamble, Southampto to Miles, bearing results of his examinations following radar course; /3 certificate, 1964 Oct 6 to Mills/Ministry of Transport, certifying he has passed examination in the Maintenance of Radar Equipment on Merchant Ships; /4 certificate of competence in radiotelegraphy, 1961 May 11, to Mills/Inspector of Wireless Telegraphy, G.P.O. (bears photo of Mills).