BIBLIOGRAPHY 1. 1. Mott, N.F., and F. Evans. Analysis of balloon calibration with GL Mk I/EF on matted sites. June 1941. PRO WO 291/1. 2. 2. Mott, N.F. GL Mk I/EF and Mk II: Cliff edge effect on EF calibration. October 1941. PRO WO 291/2. 3. 3. Hill, D.K., and A.F. Huxley. Accuracy of GL Mk I feeding Vickers predictor. October 1941. PRO WO 291/3. 4. 4. Arney, S.E. Projectors P U 3". June 1941. PRO WO 291/4. 5. 5. Hill, D.K. Chances of hitting at high angles of elevation: The expected increase in shooting efficiency made possible by high angle GL following. June 1941. PRO WO 291/5. 6. 6. Whittaker, J.M. Tracking of enemy aircraft. July 1941. PRO WO 291/6. 7. 7. Spalding, J.F. Summarized report on GL carpet. 1941. PRO WO 291/7. 8. 8. Skinner, A.J., and M. Gye. Analysis of AA gunfire from data contained in AA intelligence form ZZ for period 1 March – 5 March 1941. 1941. PRO WO 291/8. 9. 9. Bayly-Pike, D.F., and B.L. Andrew. Interim report on GCI in Hyde Park. July 1941. PRO WO 291/9. 11. 11. Lowson, M.H. Tests carried out with CD/CH(L) mobile equipment to ascertain the influence of site on bearing errors. October 1941. PRO WO 291/10. 12. 12. Skinner, A.J., and M. Gye. Analysis of ZZ forms for the period 5 April - 31 July 1941. July 1941. PRO WO 291/11. 13. 13. Varley, G.C. CD sets at Dover. Interim Report No 1. Interim Report No 2. August 1941. PRO WO 291/12 and PRO WO 291/13. 15. 15. Author Unknown. Analysis of line reading GL Mk II trials at Watchett. July 1941. PRO WO 291/14. 16. 16. Leeds, R.J. The line telephone system of the searchlight cluster station. July 1941. PRO WO 291/15. 17. 17. Mort, J. Bearing trials of GL Mk I A. July 1941. PRO WO 291/16. 18. 18. Mort, J., and M.V. Wilkes. Double bearing aerial system. August 1941. PRO WO 291/17. 19. 19. Varley, G.C., and M.V. Wilkes. Performance of NT 27IX and other sets at Dover. September 1941. PRO WO 291/18. 20. 20. Nabarro, F.R.N. An analysis of the bearing and angle of sight errors of GL in aircraft calibration. September 1941. PRO WO 291/19. 22. 22. Hill, D.K. GL Mk II and predictor investigation. September 1941. PRO WO 291/20. 23. 23. Whittaker, J.M. Tracks of enemy aircraft over gun defended areas. April - July 1941. September 1941. PRO WO 291/21. 24. 24. Butler, H.E., A.D. Skelding, and K. Wilson. Synchronised plotting of an aircraft from three GL sites. December 1941. PRO WO 291/22. 25. 25. Hey, J.S., J.T.G. Milne, and S.J. Parsons. Comparison of 0.4 and 0.6 bearing systems for GL Mk II. October 1941. PRO WO 291/23. 26. 26. Swann, M.M., and A.D. Skelding. Field check on unseen fire control in Area Tyne Q. October 1941. PRO WO 291/24. 27. 27. Powell, C. Balloon interference and GL bearing. October 1941. PRO WO 291/25. 28. 28. Wilson, K., and D. Lack. Common GL Mk I errors affecting graphical prediction. December 1941. PRO WO 291/26. 29. 29. Rogers, G.A., D. Lack, and M.V. Wilkes. 10cm CD trials at Arran. January 1942. PRO WO 291/27. 30. 30. Bayliss, L.E. Range and angle of sight measurements in AA gunnery with special reference to unseen methods of fire control. February 1942. PRO WO 291/28. 31. 31. Dobson, K.G. Frequency stability of SLC transmitters in the field. January 1942. PRO WO 291/29. 32. 32. Porter, A. Investigation of the performance of the Metro-Vick system for the automatic control of GL Mk III aerial. January 1942. PRO WO 291/30. 33. 33. Varley, G.C. Mutual interference between the NT 27IX sets in the Dover area. October 1941. PRO WO 291/31. 34. 34. Bayliss, L.E. Extended range drum for GL height computer gear. December 1941. PRO WO 291/32. 35. 35. Whittaker, J.M. Tracks of enemy aircraft over gun defended areas: Part II Merseyside and IAZ. December 1941. PRO WO 291/33. 36. 36. Varley, G.C. 10cm CD sets in the Dover area. January 1942. PRO WO 291/34. 37. 37. Bayly-Pike, D.F., and B.L. Andrew. AA/GCI accuracy trials. October 1941. PRO WO 291/35. 38. 38. Morphet, W.M., and M.V. Wilkes. Use of a small mat to improve vertical polar diagrams of GL Mk I transmitter signal. January 1942. PRO WO 291/36. 39. 39. Bayly-Pike, D.F., and B.L. Andrew. Siting trials carried out in London area with mobile GCI. February 1942. PRO WO 291/37. 40. 40. Leeds, R.J. Telephone communication with SLC heaters Mks I and I*. February 1942. PRO WO 291/38. 41. 41. Ewer, D.W. Operational trials with GL Mk II and Vickers predictor during period 13 October - 1 November 1941. January 1942. PRO WO 291/39. 42. 42. Britton, E.B. The use of free balloons for lining up SLC. January 1942. PRO WO 291/40. 43. 43. Whittaker, J.M., and M. Gye. Report of the analysis of ZZ forms for the period 1 August - 30 November 1941. January 1942. PRO WO 291/41. 44. 44. Bayliss, L.E., D.K. Hill, and A.F. Huxley. Laboratory experiments on Vickers and Sperry predictors supplied from GL Mk II. February 1942. PRO WO 291/42. 45. 45. Nabarro, F.R.N., and E. Humphreys. The divergence between legs of balloon calibration in GL/EF and GL Mk II on matted sites. January 1942. PRO WO 291/43. 46. 46. Nabarro, F.R.N. Use of free balloons carrying crossed dipoles as targets for AA-RDF equipment. January 1942. PRO WO 291/44. 47. 47. Bayliss, L.E. Operational trials of the PPI. January 1942. PRO WO 291/45. 48. 48. Hill, D.K. Operational A batteries deployed in HAA role. No Date. DO. 49. 49. Lack, D. Weather during night raids in relation to visual control of searchlights. February 1942. PRO WO 291/46. 52. 52. Nabarro, F.R.N., and E. Humphreys. The effect of imperfect mat bonding on GL elevation finding. February 1942. PRO WO 291/47. 54. 54. Bayliss, L.E. Summary of information at present available about the accuracy of HAA fire at night. March 1942. PRO WO 291/48. 55. 55. Parsons, S.J. Trial of a 0.4 lambda bearing system on GL Mk II obtained by lowering the cabin without changing the aerial position. March 1942. PRO WO 291/49. 56. 56. Bayliss, L.E. Engagement of mine-laying aircraft by unseen methods with Sperry predictor. April 1942. PRO WO 291/50. 57. 57. Hey, J.S., J.T.G. Milne, and S.J. Parsons. Investigation of the performance of GL Mk II. February 1942. PRO WO 291/51. 58. 58. Hill, D.K. The 3in rocket (AD fuse) in the role of HAA for unseen fire at aircraft flying at heights between 9,000 - 13,000 feet. The relative effectiveness of the Z battery and the gun battery. February 1942. PRO WO 291/52. 59. 59. Hey, J.S., and J.T.G. Milne. The variation of GL Mk II bearing discrimination with the length of the Number 8 Feeder. March 1942. PRO WO 291/53. 60. 60. Varley, G.C., et al. The operational performance of NT 271 as a coast watching equipment. April 1942. PRO WO 291/54. 61. 61. Hill, D.K. The functions of rockets in AA defence. June 1942. PRO WO 291/55. 62. 62. Wilson, K. Trials of GL Mk IIIC 26 January - 15 March 1942. May 1942. PRO WO 291/56. 63. 63. Whittaker, J.M. Modification of time drum on a Vickers predictor for engagement of diving targets with heavy equipment. May 1942. PRO WO 291/57. 64. 64. Spalding, J.F. Over-interrogation of IFF by SLC. May 1942. PRO WO 291/58. 65. 65. Hey, J.S., and J.T.G. Milne. Adaptation of GL Mk II for the engagement of mine-laying aircraft. June 1942. PRO WO 291/59. 66. 66. Whittaker, J.M., and M. Gye. Report on the analysis of ZZ forms for the period 1 December - 31 March 1942. July 1942. PRO WO 291/60. 67. 67. Powell, C, and K. Wilson. The effect of rope rigging on GL interference from a balloon barrage. June 1942. PRO WO 291/61. 68. 68. Hill, D.K. AA defence with flashless propellant and contact fuses. July 1942. PRO WO 291/62. 69. 69. Nabarro, F.R.N. Use of SLC for early warning. 1942. PRO WO 291/63. 70. 70. Varney, G.C., and M.V. Wilkes. Trials of a high power 10cm set at Ventnor. July 1942. PRO WO 291/64. 71. 71. Spalding, J.F. Experimental trials using GCI plots to assist searchlight aided interception. July 1942. PRO WO 291/65. 72. 72. Edes, N.H., R.H. Tanner, and R.M. Fernie. Trials of wireless sender RCA type ET4332B with R107 receiver fitted in ACV and working to a similar station. October 1942. In two parts: PRO WO 291/66 and PRO WO 291/67. 73. 73. Whittaker, J.M., and M. Gye. Report on the analysis of ZZ forms for the period 1 April 1942 to 31 March 1944.