Correspondents on defence inventions and suggestions from the general public include: Laurence Boutwood, Secretary to the 3rd Sea Lord and Controller of the Navy; Brigadier-General Sir Henry Page Croft on the [installation of a munitions plant by the Plessey Company Limited]; Allen Clark [Joint Managing Director, Plessey Company Limited] on the installation; Richard Powell [Private Secretary to the First Lord of the Admiralty]; Rear-Admiral Bertram Ramsay [Chief of Staff, Home Fleet] on information for WSC; Field Marshal Sir Cyril Deverell [Chief of Imperial General Staff]; Air Vice-Marshal Richard Peirse [Deputy Chief of Air Staff]; Vice-Admiral Sir Reginald Henderson [3rd Sea Lord and Controller of the Navy] on the use of dummy submarine periscopes; Sir Herbert Creedy [Permanent Under-Secretary of State for War] on anomalies in service pensions; William Elliot [Assistant Secretary], Committee of Imperial Defence (8); Eric Troward, Organizer of the Air Raid Protection Association (5); Alexander Wallace, Headmaster of Sherborne School, Dorset, on the use of unsafe aircraft in the Fleet Air Arm.Other subjects include: munitions inventions and theories; anti-aircraft defence; engine design and development; the high numbers of crashes in the RAF; air raid defences.Also includes: notes and memoranda on subjects including anti-aircraft gun sights, the use of sailing factory ships for training and fishing, and the poor organization of emergency fire services; pamphlet on a suggested aircraft engine design; leaflets from the Air Raid Protection Association; notes and copies of correspondence by WSC and Violet Pearman and Kathleen Hill [Secretaries to WSC] to individuals listed above and also to others including Duncan Sandys.