Air Defence Research Sub-Committee Papers (A.D.R. 69-90) (73 missing) and other prints Memorandum by WSC on German Air Strength, with comments by the Air Staff (CID Papers 1295B and 1296B) Note by the Master General of the Ordnance Lt-Gen Sir Hugh Elles on trials to determine the effective range of searchlights (A.D.R. 69) Air Ministry note on meteorological questions (A.D.R. 70) Air Ministry note on experiments to determine the effective range of searchlights (A.D.R. 71) Memorandum by Air Raid Precautions Department on lighting restrictions in time of war (A.D.R. 72) Air Ministry report on investigation of the conditions in which an internal combustion engine with electric ignition might be stopped by radio methods (A.D.R. 74) Air Ministry note on Radio Direction Finding (R.D.F. later radar) and balloon barrages (A.D.R. 75) Note by the Master General of the Ordnance, Lt-Gen Sir Hugh Elles, on rocket research (A.D.R. 76) Conclusions of the 12th meeting of the Committee Note by the Master General of the Ordnance, Lt-Gen Sir Hugh Elles, on the use of 2 inch rockets as a means of training pending the development of a service rocket (A.D.R. 77) Report by Sir George Simpson, Director, Meteorological Office on Single Observer Forecasting (A.D.R. 79) Air Ministry note on Radio Direction Finding (R.D.F. later radar) and balloon barrages (A.D.R. 80) Memorandum by the Air Staff on decoy lighting (A.D.R. 81) Report by Dr Alwyn Crow on the progress of rocket investigation (A.D.R. 82) Memorandum by Sir Henry Tizard on silhouette detection by aircraft (A.D.R. 83) Note by the Air Staff on silhouette floodlighting (A.D.R. 84) Memorandum by the Deputy Chief of the Air Staff on the location of aircraft by R.D.F. (Radar) (A.D.R. 85) Conclusions of 14th meeting of the Committee Note by Lt-Gen Sir Hugh Elles, Master General of the Ordnance on rocket development (A.D.R. 86) Note by Lt-Gen Sir Hugh Elles, Master General of the Ordnance on searchlight experiments (A.D.R. 87) Air Ministry note on Radio Direction Finding (R.D.F. later radar), silhouette detection of aircraft, detection of aircraft by infra-red radiation, interception experimentsm, balloon barrages (A.D.R. 88) Note by the Air Staff on the single observer method of weather forecasting (A.D.R. 89) Memorandum by the Sub-Committee of Assessors on bomb v battleship experiments on the development and production of fire control instruments (A.D.R. 90).