| Description | Date | Identifier | |
| Letter from the Aircraft Gun Mounting Establishment regarding drawings, a gun mounting model, and the arrival of a Beaufighter aircraft. | 25th Mar 1941 | Box 176 \ 1 img151 | |
| The installation of a .5 Bore Machine Gun Type A.A. and ammunition system in a Spitfire. | 27th Mar 1941 | Box 176 \ 1 img152 | |
| Installation drawings for a 40mm gun on a Beaufighter aircraft. | 30th Mar 1941 | Box 176 \ 1 img153 | |
| Letter from Bristol Aeroplane Company regarding the installation of 40mm and 20mm guns in the Beaufighter aircraft. | 27th Mar 1941 | Box 176 \ 1 img154 | |
| Letter to Bristol Stamping Co. Ltd. explaining the inability to send a specialist and arranging for a representative to visit instead. | 13th Mar 1915 | Box 176 \ 1 img155 | |
| Installation of a .500 bore Type A.A. gun in a Spitfire wing. | 31th Mar 1941 | Box 176 \ 1 img156 | |
| Letter to Vickers Supermarine Ltd. requesting design prints for a Spitfire wing ammunition box and chute. | 4th Apr 1941 | Box 176 \ 1 img157 | |
| The proof and firing trials for a 40 m/m gun for a Beaufighter installation. | 17th Apr 1941 | Box 176 \ 1 img158 | |
| Finalizing a 40 mm. gun installation and coordinating a visit to Hucknall. | 21th Apr 1941 | Box 176 \ 1 img159 | |
| Letter to Doctor Helmore regarding the finalisation of a 40 mm gun installation in a night fighter. | 21th Apr 1941 | Box 176 \ 1 img160 | |
| Letter to L.C. Frise of Bristol Aeroplane Co. Ltd. confirming a meeting. | 21th Mar 1941 | Box 176 \ 1 img161 | |
| Letter to the Ministry of Aircraft Production regarding gun trials in a Spitfire wing and requesting a turret for further tests. | 21th Apr 1941 | Box 176 \ 1 img162 | |
| Specification and allocation of 25 guns for the Air Ministry, considering different potential uses. | 21th Apr 1941 | Box 176 \ 1 img163 | |
| Follow-up letter to Vickers Supermarine Ltd. concerning an ammo box for a 1/2' Machine Gun. | 23th Apr 1941 | Box 176 \ 1 img164 | |
| Letter to Vickers-Armstrongs Ltd. seeking clarification on drawings for a Spitfire's 1/2' gun ammo box. | 24th Apr 1941 | Box 176 \ 1 img165 | |
| Letter providing the contact address and telephone number for H.I.F. Evernden, Chief of Design for the Gun Installation Section. | 26th Feb 1943 | Box 176 \ 1 img166 | |
| Secret memo discussing the ammunition box for the ½' Browning Gun in the Spitfire Wing. | 25th Apr 1941 | Box 176 \ 1 img167 | |
| Modifications for installing a 40mm gun in a Beaufighter aircraft. | 28th Apr 1941 | Box 176 \ 1 img168 | |
| Decisions on gun mounting modifications, ejection chute, and hopper design. | 28th Apr 1941 | Box 176 \ 1 img169 | |
| Confirming the loan of original tracings for a 40 mm gun fitted in a 'Beaufighter' aircraft. | 29th Apr 1941 | Box 176 \ 1 img170 | |
| Letter from The Bristol Aeroplane Co. enclosing prints and amended drawings for the Beaufighter aircraft. | 1st May 1941 | Box 176 \ 1 img171 | |
| Letter to the Bristol Aeroplane Co. regarding pneumatic connections on the Beaufighter aircraft and requesting details for a Banjo Connection. | 3rd May 1941 | Box 176 \ 1 img172 | |
| Letter to The Bristol Aeroplane Co. regarding the installation of a 40 mm gun and associated blueprints. | 8th May 1941 | Box 176 \ 1 img173 | |
| Letter to The Bristol Aeroplane Co. Ltd. enclosing drawings for a front mounting and a keel plate opening. | 9th May 1941 | Box 176 \ 1 img174 | |
| Letter from Bristol Aeroplane Co. concerning the installation of a 40 mm gun on a Beaufighter aircraft. | 12th May 1941 | Box 176 \ 1 img175 | |
| The arrangement and specifications of blast tubes for a 40mm gun fitted to a Beaufighter aircraft. | 9th May 1941 | Box 176 \ 1 img176 | |
| Typed memo regarding modifying a Beaufighter aircraft installation. | 13th May 1941 | Box 176 \ 1 img177 | |
| Diagrams for the installation of a 40 m/m gun in a Beaufighter aircraft. | 13th May 1941 | Box 176 \ 1 img178 | |
| Typed communication to Frise Aviation in Bristol regarding a machine modification at Hucknall. | 19th May 1941 | Box 176 \ 1 img179 | |
| Short instructional telegram message with connected words. | 13th May 1941 | Box 176 \ 1 img180 | |
| The revised installation of a 40 m/m gun in a Beaufighter aircraft. | 13th May 1941 | Box 176 \ 1 img181 | |
| Part requirements for mounting a Type A.A. Gun in a Spitfire wing for rig and flight tests. | 13th May 1941 | Box 176 \ 1 img182 | |
| Installation schemes for a 40 m/m gun in a Beaufighter aircraft, including a list of blueprints. | 13th May 1941 | Box 176 \ 1 img183 | |
| The functioning and endurance trials of a 40mm Aircraft Cannon. | 17th May 1941 | Box 176 \ 1 img184 | |
| The results and remarks from a firing trial, including accuracy, wear, and performance issues. | 1st May 1941 | Box 176 \ 1 img185 | |
| Conclusions and recommendations regarding a gun's malfunctioning and necessary modifications. | 1st May 1941 | Box 176 \ 1 img186 | |
| The urgent modification of a Beaufighter hull at Hucknall to fit a 40mm gun. | 19th May 1941 | Box 176 \ 1 img187 | |
| Drawings for the installation of a 40 mm gun in a Beaufighter aircraft. | 20th May 1941 | Box 176 \ 1 img188 | |
| The design and installation of .500 guns and ammunition boxes in Spitfire wings. | 20th May 1941 | Box 176 \ 1 img189 | |
| The trials of the 40 mm Aircraft Gun No. 11239 at Pendine. | 20th May 1941 | Box 176 \ 1 img190 | |
| Gun trials detailing performance, stoppages, and specific test incidents. | 20th May 1941 | Box 176 \ 1 img191 | |
| Trial report on a cracked Cradle at the Recoil Bridge, proposing alterations to the compression ratio. | 20th May 1941 | Box 176 \ 1 img192 | |
| Letter from Bristol Aeroplane Company regarding the installation of a 40mm gun in a Beaufighter aircraft. | 23th May 1941 | Box 176 \ 1 img193 | |
| Letter to The Bristol Aeroplane Co., Ltd. regarding drawings, required panels and an order. | 25th May 1941 | Box 176 \ 1 img194 | |
| Letter detailing drawings for modifications to the Beaufighter hull to install a 40 M/m weapon. | 25th May 1941 | Box 176 \ 1 img195 | |
| Letter from The Bristol Aeroplane Co., Ltd. concerning drawings for the installation of a 40 m/m gun in a Beaufighter aircraft. | 23th May 1941 | Box 176 \ 1 img196 | |
| Non-arrival of drawings, sending second copies to Hucknall and arranging an order for panels. | 25th May 1941 | Box 176 \ 1 img197 | |
| Bristol drawings for modifications to the Beaufighter hull to install a 40 m.m. unit. | 27th May 1941 | Box 176 \ 1 img198 | |
| Instructions for the installation of Rolls-Royce 40mm cannon guns, detailing fuselage modifications and replacement of existing guns. | 27th May 1941 | Box 176 \ 1 img199 | |
| Fitting blast tubes and awaiting further drawings from Bristol's for gun mounting modifications. | 27th May 1941 | Box 176 \ 1 img200 | |
| Letter from The Bristol Aeroplane Co. Ltd. concerning the 40mm gun installation in a Beaufighter aircraft. | 27th May 1941 | Box 176 \ 1 img201 | |
| Letter to the Bristol Aeroplane Co. regarding alterations for a 40mm gun installation in a Beaufighter aircraft. | 28th May 1941 | Box 176 \ 1 img202 | |
| Letter from the Ministry of Aircraft Production regarding the modification and trials of left-hand and right-hand 40mm guns. | 11th Jun 1941 | Box 176 \ 1 img203 | |
| Letter to the Ministry of Aircraft Production regarding the production of 40 mm guns. | 11th Jun 1941 | Box 176 \ 1 img204 | |
| Telegraphic communication to Frise Aviation Bristol regarding drawings and a proposal. | 29th May 1941 | Box 176 \ 1 img205 | |
| Distributing revised blueprints for a Stirrup Half Rear gun component in a Spitfire wing. | 18th Jun 1941 | Box 176 \ 1 img206 | |
| Ministry of Aircraft Production letter ordering the cessation of development on the .5 inch machine gun. | 1st Jul 1941 | Box 176 \ 1 img207 | |
| Letter to the Ministry of Aircraft Production clarifying the development of .5' and .55' machine guns. | 8th Jul 1941 | Box 176 \ 1 img208 | |
| Letter discussing the trial of a .5' gas operating weapon as a .55' calibre and the associated ammunition supply issues. | 12th Jul 1941 | Box 176 \ 1 img209 | |
| Notes on trials of 40mm and .5' guns at Pendine, including reviews of Vickers, Browning, and German Mauser models. | 5th Aug 1941 | Box 176 \ 1 img210 | |
| Confirmation of loaned blueprints for the 40 m.m. Gun in Beaufighter. | 6th Aug 1941 | Box 176 \ 1 img211 | |
| Abandoned scheme for a 40mm gun ejector chute in a Beaufighter aircraft. | 18th Aug 1941 | Box 176 \ 1 img212 | |
| Meeting with Air Commodore Huskisson to discuss various gun types, including Browning, Mauser, and different calibre weapons. | 11th Sep 1941 | Box 176 \ 1 img213 | |
| Confirming arrangements for the loan of a 15mm Mauser gun. | 15th Aug 1941 | Box 176 \ 1 img214 | |
| Confidential memo regarding putting a matter to the A.C.A.S.T. and the installation of a 40 m.m. gun in a Hurricane. | 26th Aug 1941 | Box 176 \ 1 img215 | |
| Letter to Air Marshall A.S. Barrett regarding information of primary importance to the war effort. | 16th Sep 1941 | Box 176 \ 1 img216 | |
| Firing trial results for Gun 11240 on a Beaufighter aircraft at Duxford. | 29th Sep 1941 | Box 176 \ 1 img217 | |
| Letter from the Ministry of Aircraft Production regarding the secrecy of the Hurricane II's 40mm guns. | 5th Mar 1942 | Box 176 \ 1 img218 | |
| The acceptance and endurance trials of 40mm Type BH aircraft guns. | 8th May 1942 | Box 176 \ 1 img219 | |
| Summary report on firing tests for a Port Gun and a Starboard Gun, detailing performance, stoppages, and servicing. | 8th May 1942 | Box 176 \ 1 img220 | |
| Starboard Gun's accuracy, parts replacement, and servicing requirements. | 8th May 1942 | Box 176 \ 1 img221 | |
| Photographs of a 40mm Naval Gun converted to an automatic aircraft weapon for endurance trials. | 19th May 1942 | Box 176 \ 1 img222 | |
| Cutaway view of an automatic cannon showing the feeding mechanism and breech. | 19th May 1942 | Box 176 \ 1 img223 | |
| Photograph of a disassembled large-caliber automatic weapon or cannon, showing the barrel, breech, and firing mechanism components. | 19th May 1942 | Box 176 \ 1 img224 | |
| Photograph showing an internal, top-down view of a firearm mechanism. | 9th Nov 1942 | Box 176 \ 1 img225 | |
| The future requirements for aircraft cannon guns, comparing the ballistic merits of 6-pdr and 12-pdr variants. | 9th Nov 1942 | Box 176 \ 1 img226 | |
| Stabilisation of a 47mm aircraft gun and the development of an automatic feed for a 6-pdr tank gun. | 2nd Dec 1942 | Box 176 \ 1 img227 | |
| Alterations to Clan Foundry to accommodate the Chassis Experimental Department and the lack of A.R.P. shelters. | 12th Jan 1940 | Box 176 \ 2 img001 | |
| Responding to a request for drawing boards, stating they are unavailable as they are all in use. | 13th Jan 1940 | Box 176 \ 2 img002 | |
| Secret memo concerning the removal of chassis blueprints to the Clan Foundry for a Rationalised Programme. | 13th Jan 1940 | Box 176 \ 2 img003 | |
| Chassis blueprints and the commencement stock of drawing numbers required by various departments. | 17th Jan 1940 | Box 176 \ 2 img004 | |
| Requesting to contact Alvis Ltd. to arrange financial matters for drawing boards. | 18th Jan 1940 | Box 176 \ 2 img005 | |
| Proposal to modify working hours due to difficulties with bus travel for staff. | 18th Jan 1940 | Box 176 \ 2 img006 | |
| Confidential memo about adjusting working hours to fit bus schedules and a query regarding subsistence allowances for evacuated staff. | 16th Jan 1940 | Box 176 \ 2 img007 | |
| List of machine tools requested for a shop layout for experimental reasons. | 19th Jan 1940 | Box 176 \ 2 img008 | |
| List of required grinders and a marking-off table, with a request for comments on obtaining them from Glasgow. | 19th Jan 1940 | Box 176 \ 2 img009 | |
| Comparison of capabilities and costs for different gear cutting machines. | 19th Jan 1940 | Box 176 \ 2 img010 | |
| Requesting an order for 12 boards for a draughtsman at the Clan Foundry. | 19th Jan 1940 | Box 176 \ 2 img011 | |
| Clarifying the allocation of rig test equipment during its removal to the Clan Foundry. | 19th Jan 1940 | Box 176 \ 2 img012 | |
| To Sft/Mr. Guest regarding a list of required testing equipment for Clan Foundry. | 19th Jan 1940 | Box 176 \ 2 img013 | |
| List of inspection tackle and equipment. | 19th Jan 1940 | Box 176 \ 2 img014 | |
| Clarifying the ownership of the Glasgow factory and the protocol for sharing machine resources with Derby. | 20th Jan 1940 | Box 176 \ 2 img015 | |
| Urgent placement of machine orders, coordinating with the Glasgow facility, and obtaining quotes from suppliers. | 22th Jan 1940 | Box 176 \ 2 img016 | |
| Modified working hours and employee punctuality under evacuated conditions. | 22th Jan 1940 | Box 176 \ 2 img017 | |
| Letter from Frederick Carter & Son offering to sell Centre Lathes. | 24th Jan 1940 | Box 176 \ 2 img018 | |
| Cover of a brochure for a motor driven Brown & Sharpe No. 4 Universal Grinding Machine. | 24th Jan 1940 | Box 176 \ 2 img019 | |
| Specifications for the No. 4 Universal Grinding Machine, motor-driven model. | 24th Jan 1940 | Box 176 \ 2 img020 | |
| Specification sheet for a Brown & Sharpe Universal Grinding Machine. | 24th Jan 1940 | Box 176 \ 2 img021 | |
| Promotional page detailing the features of the Brown & Sharpe No. 4 Universal Grinding Machine. | 25th Jan 1940 | Box 176 \ 2 img022 | |
| Responding to a request, outlining significant supplier delays for machines and the resulting inability to release equipment for the Glasgow Factory. | 25th Jan 1940 | Box 176 \ 2 img023 | |
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