| Description | Date | Identifier | |
| Clarifying production numbers for 40mm Type BB automatic aircraft guns and halting further work. | 23th Aug 1940 | Box 176 \ 1 img051 | |
| Progress report on the experimental firing trials of a half-inch gun, detailing reliability issues. | 25th Aug 1940 | Box 176 \ 1 img052 | |
| 40mm gun, including drawings for the Admiralty, sea-water trials, and installation in a Beaufighter. | 25th Aug 1940 | Box 176 \ 1 img053 | |
| Letter to the Bristol Aeroplane Company regarding the testing of a 40mm gun and coordinating a visit. | 25th Jun 1940 | Box 176 \ 1 img054 | |
| Questioning the suspension of work on 40 mm type BB automatic guns for installation in a Beaufighter aircraft. | 30th Aug 1940 | Box 176 \ 1 img055 | |
| Secret memo discussing the installation drawing and fitment challenges for a 13.2mm machine gun into an aircraft wing. | 30th Aug 1940 | Box 176 \ 1 img056 | |
| Comparison of gun dimensions and installation difficulties in various fighter aircraft wings. | 17th Nov 1938 | Box 176 \ 1 img057 | |
| The construction of two 40mm Type BB automatic guns for aircraft from existing experimental units. | 3rd Sep 1940 | Box 176 \ 1 img058 | |
| Plans for building two further automatic guns following trial completion. | 6th Sep 1940 | Box 176 \ 1 img059 | |
| Copy of a telegram arranging a meeting regarding a cannon gun installation. | 6th Sep 1940 | Box 176 \ 1 img060 | |
| Letter from Vickers-Armstrongs regarding a drawing for a Spitfire gun installation. | 6th Sep 1940 | Box 176 \ 1 img061 | |
| Letter to Vickers-Armstrong Ltd. regarding the testing of a Griffon engine mounting and the power plant for a prototype aircraft. | 10th Sep 1940 | Box 176 \ 1 img062 | |
| Brief progress update on the development of the Reid test gun for the Ministry of Aircraft Production. | 11th Sep 1940 | Box 176 \ 1 img063 | |
| Arrangement drawing for a .500 bore Browning machine gun for aircraft. | 13th Sep 1940 | Box 176 \ 1 img064 | |
| Difficulties of installing a type A.A. .500 machine gun into a Spitfire wing. | 14th Sep 1940 | Box 176 \ 1 img065 | |
| Recommendations for modifying A.A. guns for installation, referencing the Browning gun and discussions with Supermarine. | 16th Sep 1940 | Box 176 \ 1 img066 | |
| Photographs of .303 Browning Guns in the wings of Spitfire and Hurricane aircraft. | 16th Sep 1940 | Box 176 \ 1 img067 | |
| Photograph of two ammunition boxes for a Hurricane aircraft, one closed and one with its lid open. | 16th Sep 1940 | Box 176 \ 1 img068 | |
| Photograph of ammunition magazines for a Hurricane aircraft. | 16th Sep 1940 | Box 176 \ 1 img069 | |
| View of the internal gun bay of a Hawker Hurricane aircraft, showing a Browning machine gun and ammunition boxes. | 16th Sep 1940 | Box 176 \ 1 img070 | |
| Photograph showing a section of a Hurricane aircraft fuselage with an open maintenance panel. | 16th Sep 1940 | Box 176 \ 1 img071 | |
| Photograph of the open gun and ammunition bay in the wing of a Spitfire aircraft. | 16th Sep 1940 | Box 176 \ 1 img072 | |
| Photograph of a hinged metal panel from a Spitfire aircraft. | 16th Sep 1940 | Box 176 \ 1 img073 | |
| Photograph showing the internal structure of a Spitfire wing with various access panels open. | 16th Sep 1940 | Box 176 \ 1 img074 | |
| Internal photograph of a Spitfire aircraft fuselage showing the structure, mechanisms, and open access panels. | 16th Sep 1940 | Box 176 \ 1 img075 | |
| Photograph of a Spitfire fuselage under construction or maintenance, resting on a wooden trestle. | 16th Sep 1940 | Box 176 \ 1 img076 | |
| Photograph of a .303 Browning machine gun. | 18th Sep 1940 | Box 176 \ 1 img077 | |
| Copy of a message arranging a meeting with Mr. Frise of the Bristol Aeroplane Company. | 18th Sep 1940 | Box 176 \ 1 img078 | |
| Letter to the Ministry of Aircraft Production regarding the release of information on a 40 mm gun to the American Embassy. | 18th Sep 1940 | Box 176 \ 1 img079 | |
| The installation progress and operational requirements for a 40mm gun in a Beaufighter aircraft. | 20th Sep 1940 | Box 176 \ 1 img080 | |
| Notes on Beaufighter armament, including 20mm and 40mm cannons, and issues with the Hispano gun. | 20th Sep 1940 | Box 176 \ 1 img081 | |
| The problems and limitations of installing various guns in aircraft turrets. | 20th Sep 1940 | Box 176 \ 1 img082 | |
| Progress report on the installation and testing of a 40mm gun in a Beaufighter aircraft. | 20th Sep 1940 | Box 176 \ 1 img083 | |
| The use of cannon guns in Beaufighter aircraft, including details on 20 mm guns. | 20th Sep 1940 | Box 176 \ 1 img084 | |
| Discussions with Parnall B. & P. Ltd. concerning aircraft turret armament and ammunition feed system limitations. | 20th Sep 1940 | Box 176 \ 1 img085 | |
| Blueprint showing the arrangement and clamping of four rounds or cylinders. | 20th Sep 1940 | Box 176 \ 1 img086 | |
| Blueprint detailing a component with dimensions and rivet specification. | 20th Sep 1940 | Box 176 \ 1 img087 | |
| Blueprint drawing for a component named 'CLIP-13.2 A'. | 25th Sep 1940 | Box 176 \ 1 img088 | |
| Blueprint for an ammunition case or clamp. | 25th Sep 1940 | Box 176 \ 1 img089 | |
| Letter to Bristol Aeroplane Co. requesting information on harmonising gears, electro-pneumatic firing gears, and turret installations. | 20th Sep 1940 | Box 176 \ 1 img090 | |
| Confidential memo discussing the installation of a 40 m.m. automatic gun in the Beaufighter aircraft. | 26th Sep 1940 | Box 176 \ 1 img091 | |
| Supply and retention of 40mm gun barrels for an Air Ministry contract. | 1st Oct 1940 | Box 176 \ 1 img092 | |
| Outlining the progress of various gun installation projects. | 5th Oct 1940 | Box 176 \ 1 img093 | |
| Progress report letter to the Ministry of Aircraft Production on the development of a half-inch gun. | 7th Oct 1940 | Box 176 \ 1 img094 | |
| Letter to the Minister of Aircraft Production regarding a contract for the development of 13.2 mm and .5 inch recoil-operated machine guns. | 7th Oct 1940 | Box 176 \ 1 img095 | |
| Details on the conversion of 13.2mm guns, supply of spare barrels, and a list of pre-production models. | 1st Jul 1940 | Box 176 \ 1 img096 | |
| Letter detailing costs, contractual amendments, and supply information for .5 inch gun development. | 8th Oct 1940 | Box 176 \ 1 img097 | |
| Inquiry regarding the manufacturer of protective containers for storing prints, following an air-raid. | 8th Oct 1940 | Box 176 \ 1 img098 | |
| Potential interchangeability of a Type A.A. gun with a .500 Browning by using the same mounting in a Spitfire Wing. | 14th Oct 1940 | Box 176 \ 1 img099 | |
| Requesting a full-size drawing of the R.R. feed for the 40 m.m. gun installation in a Beaufighter aircraft. | 16th Oct 1940 | Box 176 \ 1 img100 | |
| Letter from the Bristol Aeroplane Company regarding guns in turrets and drawing office containers. | 16th Oct 1940 | Box 176 \ 1 img101 | |
| Letter from the RAF comparing the specifications of Belgian and American .5' Browning machine guns. | 16th Oct 1940 | Box 176 \ 1 img102 | |
| 40mm Gun installation in the 'Beaufighter' aircraft. | 18th Oct 1940 | Box 176 \ 1 img103 | |
| Letter to L.G. Frise of Bristol Aeroplane Co. Ltd. regarding the Chatwood Safe Container and a 40 mm. gun. | 20th Oct 1940 | Box 176 \ 1 img104 | |
| Letter to the Bristol Aircraft Co. regarding the installation of a 40 m.m. gun in a Beaufighter aircraft. | 9th Oct 1940 | Box 176 \ 1 img105 | |
| Letter regarding the limits for a gun loader's position and the installation of automatic feeds. | 31th Oct 1940 | Box 176 \ 1 img106 | |
| Covering letter attaching a response from the Chief Inspector of Small Arms with serial numbers for 50 .5-inch Machine Guns. | 31th Oct 1940 | Box 176 \ 1 img107 | |
| Instruction from the Chief Inspector of Small Arms detailing the serial numbers for a contract of 50 .5-in machine guns. | 28th Oct 1940 | Box 176 \ 1 img108 | |
| Letter from Bristol Aeroplane Company discussing the installation and operation of aircraft guns and cannons. | 31th Oct 1940 | Box 176 \ 1 img109 | |
| Letter discussing gun installation, ejection, and feed mechanisms for aircraft cannons. | 31th Oct 1940 | Box 176 \ 1 img110 | |
| Notes on the alignment and range of adjustment for fixed aircraft guns. | 1st Jan 1940 | Box 176 \ 1 img111 | |
| The adjustment and clearance requirements for fixed aircraft gun mountings. | 1st Jan 1940 | Box 176 \ 1 img112 | |
| Specifications for the adjustment range of gun mountings in two and four-gun turrets. | 1st Jan 1940 | Box 176 \ 1 img113 | |
| Cover letter forwarding a copy of a letter from The Bristol Aeroplane Co. Ltd. | 6th Nov 1940 | Box 176 \ 1 img114 | |
| The issue and filing of drawings for the 40 m.m. Gun installation in a Beaufighter aircraft. | 7th Nov 1940 | Box 176 \ 1 img115 | |
| Correspondence regarding the installation of a 40 m/m gun in the Beaufighter aircraft and a potential ground-strafing variant. | 7th Nov 1940 | Box 176 \ 1 img116 | |
| Letter from Bristol Aeroplane Company discussing the installation of a 40mm gun on a Beaufighter aircraft. | 5th Nov 1940 | Box 176 \ 1 img117 | |
| Secret memo detailing drawings for .303 Browning Guns in Spitfire & Hurricane wings. | 29th Nov 1940 | Box 176 \ 1 img118 | |
| Cover note regarding the details and position of various experimental guns. | 27th Nov 1940 | Box 176 \ 1 img119 | |
| Status report on the position of various experimental guns. | 20th Nov 1940 | Box 176 \ 1 img120 | |
| Letter from Bristol Aeroplane Company regarding the installation of a 40mm gun in a Beaufighter aircraft. | 2nd Dec 1940 | Box 176 \ 1 img121 | |
| Letter detailing modifications for a gun and magazine installation. | 2nd Dec 1940 | Box 176 \ 1 img122 | |
| Letter to D.L. Frise of Bristol Aeroplane Co. confirming travel arrangements, mentioning the 'Black-out'. | 4th Dec 1940 | Box 176 \ 1 img123 | |
| Message postponing a visit to the Bristol Aeroplane Company. | 5th Dec 1940 | Box 176 \ 1 img124 | |
| Illegible and heavily degraded document. | 2nd Dec 1940 | Box 176 \ 1 img125 | |
| Letter from Bristol Aeroplane Company regarding the installation of a 40mm gun in a Beaufighter. | 2nd Dec 1940 | Box 176 \ 1 img126 | |
| Outlining required modifications to accommodate a B.U.S.M. type magazine and gun mounting. | 7th Dec 1940 | Box 176 \ 1 img127 | |
| Letter to L.L. Frise of Bristol Aeroplane Co. Ltd. regarding the review of installation drawings. | 7th Dec 1940 | Box 176 \ 1 img128 | |
| Letter to Bristol Aeroplane Co. Ltd. regarding the review of installation drawings. | 7th Dec 1940 | Box 176 \ 1 img129 | |
| Mounting of a 40 mm gun in a Beaufighter aircraft, including design modifications. | 20th Dec 1940 | Box 176 \ 1 img130 | |
| Notes from a visit by Air Commodore Huskinson concerning the development and policy of .5' and 40mm guns. | 15th Jan 1941 | Box 176 \ 1 img131 | |
| The development and installation of 40 mm and .5' guns for aircraft. | 15th Jan 1941 | Box 176 \ 1 img132 | |
| Meeting notes discussing the potential of 15 mm BESA ammunition and the development of a gas-operated gun. | 15th Jan 1941 | Box 176 \ 1 img133 | |
| Forwarding an original letter from Air Commodore Huskinson for information and action. | 29th Jan 1941 | Box 176 \ 1 img134 | |
| Letter from the Ministry of Aircraft Production concerning the testing of aircraft armaments and ammunition supply. | 27th Jan 1941 | Box 176 \ 1 img135 | |
| Letter from the Ministry of Aircraft Production regarding the arrangements for testing a 40mm gun. | 31th Jan 1941 | Box 176 \ 1 img136 | |
| Letter from the Ministry of Aircraft Production regarding the installation of a gun at Hucknall and the associated ammunition supply. | 5th Feb 1941 | Box 176 \ 1 img137 | |
| Requesting arrangements with Hucknall, Bristol and Vickers Armstrongs to discuss proposals for mounting a gun. | 7th Feb 1941 | Box 176 \ 1 img138 | |
| Letter from the Ministry of Aircraft Production regarding the trials of 40mm guns in a Beaufighter aircraft. | 3rd Feb 1941 | Box 176 \ 1 img139 | |
| Letter to Vickers Armstrong regarding the installation of a 40mm gun into turrets. | 11th Feb 1941 | Box 176 \ 1 img140 | |
| The mounting schemes for a 40mm gun in a Beaufighter aircraft. | 10th Feb 1941 | Box 176 \ 1 img141 | |
| Letter from Vickers-Armstrongs regarding a delayed visit to Hucknall to inspect a Beaufighter for a 40m/m test installation. | 17th Feb 1941 | Box 176 \ 1 img142 | |
| Modifications required for fitting a 40 m/m gun in a Beaufighter aircraft. | 28th Feb 1941 | Box 176 \ 1 img143 | |
| Discussion and demonstration for the installation of a .5' type AB machine gun in turrets. | 5th Mar 1941 | Box 176 \ 1 img144 | |
| The project for the front mounting of a 40 m/m gun in a Beaufighter aircraft. | 10th Mar 1941 | Box 176 \ 1 img145 | |
| Project for rear mounting a 40 m/m gun in a Bristol Beaufighter aircraft. | 12th Mar 1941 | Box 176 \ 1 img146 | |
| The installation scheme for a 40 m/m gun in a Bristol Beaufighter aircraft. | 16th Mar 1941 | Box 176 \ 1 img147 | |
| Letter regarding the installation drawings for a 40mm gun in a Beaufighter aircraft. | 17th Mar 1941 | Box 176 \ 1 img148 | |
| Letter to Bristol Aircraft Co. regarding the scheme drawing for a 40 m/m gun installation in a Beaufighter aircraft. | 20th Mar 1941 | Box 176 \ 1 img149 | |
| Confidential letter from Vickers-Armstrongs regarding the installation of a 40mm gun in a Beaufighter aircraft. | 20th Mar 1941 | Box 176 \ 1 img150 | |
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