| Description | Date | Identifier | |
| Letter to the Chief Inspector of Naval Ordnance about sourcing a suitable gunner's sling for the 40 mm Naval Gun Type BD. | 7th Aug 1940 | Box 176 \ 3 img024 | |
| Visit to The British Tool & Engineering Co., Ltd, to assess their capacity for 40 M.M Gun Mark III production. | 9th Aug 1940 | Box 176 \ 3 img025 | |
| List of staff numbers and a detailed inventory of workshop machinery and their condition. | 9th Aug 1940 | Box 176 \ 3 img026 | |
| Typed inventory list of machinery across various departments, detailing quantity, type, and specifications. | 9th Aug 1940 | Box 176 \ 3 img027 | |
| Work underway at a factory, categorised by customer and priority, with conclusions on production capacity and bottlenecks. | 12th Aug 1940 | Box 176 \ 3 img028 | |
| Follow-up letter to the Chief Inspector of Naval Ordnance regarding the body strap fixing for a 40mm naval gun. | 12th Aug 1940 | Box 176 \ 3 img029 | |
| Production capabilities of Bentley Engineering Co. for a 40 m/m gun. | 13th Sep 1940 | Box 176 \ 3 img030 | |
| Discussion on armament work, specifically concerning the half-inch and 40mm guns. | 13th Aug 1940 | Box 176 \ 3 img031 | |
| Production of guns and associated tooling costs. | 13th Aug 1940 | Box 176 \ 3 img032 | |
| Letter to British Tool & Engineering Co. concerning a project awaiting Admiralty approval. | 16th Aug 1940 | Box 176 \ 3 img033 | |
| Letter to The Standard Engineering Co. regarding a project awaiting Admiralty approval. | 16th Aug 1940 | Box 176 \ 3 img034 | |
| Letter to Bentley Engineering Co. Ltd. regarding keeping capacity open for a project pending Admiralty approval. | 16th Aug 1940 | Box 176 \ 3 img035 | |
| Progress report on an armament project discussing gun installations with Phillips & Powis and Commander Young. | 18th Aug 1940 | Box 176 \ 3 img036 | |
| Visit to Frazer Nash regarding their design progress and the manufacturing of mounting components. | 18th Aug 1940 | Box 176 \ 3 img037 | |
| Meeting notes from a discussion at the Admiralty regarding the production of the 40mm gun. | 22th Aug 1940 | Box 176 \ 3 img038 | |
| Gun production rates, sub-contracting issues, and timelines involving the Admiralty and B.U.S.M. | 22th Aug 1940 | Box 176 \ 3 img039 | |
| Meeting notes from a conference discussing guns, production targets, and spares. | 11th Mar 1940 | Box 176 \ 3 img040 | |
| Meeting minutes discussing the sourcing of machine tools, the use of sub-contractors, design alterations, and barrel production for guns. | 22th Aug 1940 | Box 176 \ 3 img041 | |
| Request for complete information on machine tools, equipment, and materials required for gun production. | 24th Nov 1939 | Box 176 \ 3 img042 | |
| Minutes of a gun meeting discussing the progress of sample 40 mm guns for the Admiralty and future developments. | 29th Aug 1940 | Box 176 \ 3 img043 | |
| Single shot gun recoil issues, mountings, and production considerations. | 29th Aug 1940 | Box 176 \ 3 img044 | |
| Armament production and development, discussing gun tooling, sub-contractors, and various gun projects. | 29th Aug 1940 | Box 176 \ 3 img045 | |
| Weapon development and contracts, mentioning the Beaufighter aircraft and German armaments. | 29th Aug 1940 | Box 176 \ 3 img046 | |
| Secret memo discussing design requirements for the 40mm Type B.D. gun for use on motor torpedo boats. | 2nd Sep 1940 | Box 176 \ 3 img047 | |
| Letter to Captain Slayter regarding the manufacturing status and development of the 40 mm gun. | 4th Sep 1940 | Box 176 \ 3 img048 | |
| Notes of a discussion held on the 2nd of September regarding the 40mm gun. | 4th Sep 1940 | Box 176 \ 3 img049 | |
| Continued list of agreements regarding the production, pricing, testing, and assembly of guns. | 4th Sep 1940 | Box 176 \ 3 img050 | |
| Meeting notes concerning the production of bronze cradles, gun contracts with the Admiralty, and mountings. | 4th Sep 1940 | Box 176 \ 3 img051 | |
| Letter from the Naval Ordnance Department regarding automatic and semi-automatic gun development. | 9th Sep 1940 | Box 176 \ 3 img052 | |
| Development and fitting of a 40 mm gun for Power Boat Company and Frazer Nash's. | 10th Sep 1940 | Box 176 \ 3 img053 | |
| Installation of half-inch guns on Spitfire aircraft and the production of gun mountings. | 10th Sep 1940 | Box 176 \ 3 img054 | |
| Letter from the Admiralty concerning the inspection and proving of O.Q.F. 2 Pdr. Mark XIV Guns. | 17th Sep 1940 | Box 176 \ 3 img055 | |
| Concerning an Admiralty contract for a 40 MM gun, discussing parts supply and potential conflicts with an Air Ministry order. | 29th Sep 1940 | Box 176 \ 3 img056 | |
| Letter regarding Admiralty criticisms of a 40mm gun mounting and a request for no unapproved modifications. | 30th Sep 1940 | Box 176 \ 3 img057 | |
| Copy of a letter received from L.M. & S. regarding mountings for a 40 mm gun. | 3rd Oct 1940 | Box 176 \ 3 img058 | |
| Letter to London, Midland & Scottish Railways Ltd regarding a prototype mounting and gun. | 4th Oct 1940 | Box 176 \ 3 img059 | |
| Letter to Captain Green confirming responsibility for 40 mm Mk. XIV Gun prototype mountings and requesting a unit for experimental work. | 6th Oct 1940 | Box 176 \ 3 img060 | |
| File copy of a memo about a disagreement over modifications to a 40mm gun mounting. | 6th Oct 1940 | Box 176 \ 3 img061 | |
| Minutes from a meeting with the British United Shoe Machine Company about 40 mm. gun production. | 10th Oct 1940 | Box 176 \ 3 img062 | |
| Notes from a meeting regarding an Admiralty contract for 40mm guns. | 8th Oct 1940 | Box 176 \ 3 img063 | |
| Letter to British United Shoe Machine Works discussing material orders and a specification change from brass to aluminium. | 10th Oct 1940 | Box 176 \ 3 img064 | |
| Letter from the Admiralty concerning the design, production, and modification of prototype mountings for the L.M.S. Railway. | 14th Oct 1940 | Box 176 \ 3 img065 | |
| Shortfalls in a gun production programme and the transfer of manufacturing responsibility. | 15th Oct 1940 | Box 176 \ 3 img066 | |
| Production programme table for B.U.S.M. detailing monthly and cumulative gun output. | 16th Oct 1940 | Box 176 \ 3 img067 | |
| Responsibility for mounting design and the prevention of modifications during the war. | 16th Oct 1940 | Box 176 \ 3 img068 | |
| Letter to Admiral Whyham of The Admiralty N.O. Department enclosing a scheme drawing of a mounting. | 18th Oct 1940 | Box 176 \ 3 img069 | |
| Sizes and locations for drilling, boring, reaming, and rifling operations on 40 m/m barrels. | 20th Oct 1940 | Box 176 \ 3 img070 | |
| Table of sizes and locations for machining a 40 m/m barrel. | 20th Oct 1940 | Box 176 \ 3 img071 | |
| Manufacturing operations and setup for a 40 M/M barrel. | 21th Oct 1940 | Box 176 \ 3 img072 | |
| Manufacturing sequence diagram for rifling a bored and reamed tube. | 21th Oct 1940 | Box 176 \ 3 img073 | |
| The correct procedure for a query about adjustable washers for a Pedestal Mounting Type BD Gun. | 21th Oct 1940 | Box 176 \ 3 img074 | |
| Jammed recoil mechanism on Gun No. 11242 and a suggested design modification. | 18th Oct 1940 | Box 176 \ 3 img075 | |
| Letter to the Admiralty regarding a jammed recoil mechanism on a QF 2 pdr Mk. 14 Naval Gun and suggesting a design modification. | 23th Oct 1940 | Box 176 \ 3 img076 | |
| Letter from the Admiralty acknowledging receipt of a scheme drawing for a 40 mm mounting. | 24th Oct 1940 | Box 176 \ 3 img077 | |
| Alterations to a pedestal gun mounting due to the Admiralty's attitude. | 24th Oct 1940 | Box 176 \ 3 img078 | |
| Notes from a meeting regarding the production, mounting, and automation of a 40mm gun. | 30th Oct 1940 | Box 176 \ 3 img079 | |
| The development of 40mm and half-inch guns for installation in aircraft. | 30th Oct 1940 | Box 176 \ 3 img080 | |
| Letter to the Admiralty regarding modifications for a 2-pounder Mk. XIV 40mm Naval Gun mounting. | 31th Oct 1940 | Box 176 \ 3 img081 | |
| Summarizing a meeting regarding gun production coordination with B.U.S.M. and supply issues to the Admiralty. | 2nd Nov 1940 | Box 176 \ 3 img082 | |
| Production of 50 guns, potential programme hindrances, and the authority of various departments and the Admiralty. | 2nd Nov 1940 | Box 176 \ 3 img083 | |
| Forwarding a copy of a draft letter regarding the quantity production of 40mm guns in aluminium alloys. | 13th Dec 1940 | Box 176 \ 3 img084 | |
| Letter to the Admiralty regarding material choices and production proposals for the 2-pdr Mark XIV Gun. | 11th Dec 1940 | Box 176 \ 3 img085 | |
| Proposal for manufacturing gun components using alternative aluminium alloys, detailing quantities for two production batches. | 11th Dec 1940 | Box 176 \ 3 img086 | |
| Letter from a supplier discussing the manufacture and supply of aluminium parts for a 40 mm gun. | 17th Dec 1940 | Box 176 \ 3 img088 | |
| Letter to British United Shoe Machine Co. Ltd. regarding trials of secondary grade aluminium for cradle castings. | 27th Dec 1940 | Box 176 \ 3 img089 | |
| Order for Gun Cradles, discussing production allocation between Glasgow and another supplier. | 27th Dec 1940 | Box 176 \ 3 img090 | |
| The production of aluminium castings for a 40 mm gun for the Admiralty. | 31th Dec 1940 | Box 176 \ 3 img091 | |
| Confirmation of handing over an order for 200 sets of aluminium castings for the 40 mm gun. | 7th Jan 1941 | Box 176 \ 3 img092 | |
| Letter from B.U.S.M. about the supply of parts for the 40mm gun. | 26th Feb 1941 | Box 176 \ 3 img093 | |
| Offer from B.U.S.M. to machine 25 sets of guns for the Air Ministry. | 18th Apr 1941 | Box 176 \ 3 img094 | |
| Material selection and production processes for Bren gun springs. | 19th Apr 1940 | Box 176 \ 3 img095 | |
| Cable detailing the results of testing various materials for springs. | 19th Apr 1940 | Box 176 \ 3 img096 | |
| The return of a Vibrac Catalogue. | 25th Jun 1940 | Box 176 \ 3 img097 | |
| Tempering graph for Vibrac Steel V.45. | 25th Jun 1940 | Box 176 \ 3 img098 | |
| Tempering graph of Vibrac Steel V. 30. | 26th Jun 1940 | Box 176 \ 3 img099 | |
| Specification for Barrel Forgings, including the chemical composition for 'vibrac' steel. | 26th Jun 1940 | Box 176 \ 3 img100 | |
| Specifications for physical tests and manufacturing arrangements for barrels with English Steel Corporation and Taylor Bros. | 30th Mar 1938 | Box 176 \ 3 img101 | |
| Letter to English Steel Corporation specifying the material composition for 30 gun barrels. | 26th Jun 1940 | Box 176 \ 3 img102 | |
| Material property requirements and manufacturing plans for barrels. | 26th Jun 1940 | Box 176 \ 3 img103 | |
| Letter to Commander Oswald enclosing a weight specification for the raw material required to make a 40mm gun. | 9th Jul 1940 | Box 176 \ 3 img104 | |
| Bill of materials listing the weights required to manufacture a 40 mm gun, excluding the mounting. | 17th Jul 1940 | Box 176 \ 3 img105 | |
| Brief memo introducing information regarding barrel steels. | 17th Jul 1940 | Box 176 \ 3 img106 | |
| Specification of materials and physical requirements for 40mm and 13.2mm gun barrels and breech blocks. | 17th Jul 1940 | Box 176 \ 3 img107 | |
| Covering note for specifications regarding brass and cast phosphor bronze, with a comparison of their properties. | 17th Jul 1940 | Box 176 \ 3 img108 | |
| Specification number 215A for Cast Brass for general casting work. | 19th May 1919 | Box 176 \ 3 img109 | |
| Specification for drawn phosphor bronze bar, including chemical analysis and mechanical test results. | 1st Jan 1929 | Box 176 \ 3 img110 | |
| Letter from the Admiralty Offices concerning the specifications and manufacture of 2 pr. gun barrels. | 7th Aug 1940 | Box 176 \ 3 img111 | |
| Letter to W.A. Robotham regarding an enclosed letter for Mr. Blackstone. | 31th Jul 1940 | Box 176 \ 3 img112 | |
| Producing a new Breech Cross Shaft with improved material and hardening. | 31th Jul 1940 | Box 176 \ 3 img113 | |
| Note referencing a letter to Commander Oswald, which is located in the English Steel Corporation File. | 9th Aug 1940 | Box 176 \ 3 img114 | |
| Letter from the Admiralty Supply Dept. concerning the provision of material for 40 m.m. guns. | 9th Aug 1940 | Box 176 \ 3 img115 | |
| Letter outlining the approval process and material specifications for gun production. | 9th Aug 1940 | Box 176 \ 3 img116 | |
| V.C. Carburettor float, detailing its material composition and heat treatment. | 12th Aug 1940 | Box 176 \ 3 img117 | |
| Letter discussing material specifications and forgings for 2-pounder and 40mm gun barrels. | 12th Aug 1940 | Box 176 \ 3 img118 | |
| Sourcing and specification of steel for Mk. 14 Naval gun barrels. | 14th Aug 1940 | Box 176 \ 3 img119 | |
| Suitability of alternative Admiralty specification steels for gun barrels and clarifying minimum yield strength requirements. | 16th Aug 1940 | Box 176 \ 3 img120 | |
| Follow-up letter to Tubes Ltd. regarding a previous request for parts. | 17th Aug 1940 | Box 176 \ 3 img121 | |
| Discrepancy in the yield stress specification for barrel steel and the potential rejection of supplied barrels. | 18th Jun 1940 | Box 176 \ 3 img122 | |
| Minimum yield specification for barrel forgings. | 18th Aug 1940 | Box 176 \ 3 img123 | |
| Notification of an alternative steel material for the 40mm Type BD gun barrel. | 19th Aug 1940 | Box 176 \ 3 img124 | |
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