| Description | Date | Identifier | |
| Letter to Commander Robertson regarding the weight of raw materials for a gun and an agreed material substitution. | 22th Aug 1940 | Box 176 \ 3 img125 | |
| List of raw materials and their weights required to manufacture a 40mm gun. | 20th Aug 1940 | Box 176 \ 3 img126 | |
| Required yield and brinell hardness for gun barrels. | 20th Aug 1940 | Box 176 \ 3 img127 | |
| Letter to Messrs Tubes Ltd confirming that materials will be subject to an A.I.D. inspection. | 23th Aug 1940 | Box 176 \ 3 img128 | |
| Notes of a discussion regarding the 40mm gun. | 4th Sep 1940 | Box 176 \ 3 img129 | |
| Production details for guns, including materials, pricing, tooling, testing, and assembly. | 4th Sep 1940 | Box 176 \ 3 img130 | |
| Meeting notes on gun production, discussing bronze cradles, contracts with the Admiralty, and mountings. | 4th Sep 1940 | Box 176 \ 3 img131 | |
| Suitability of '00' Steel for 40 m/m Gear Barrels. | 12th Sep 1940 | Box 176 \ 3 img132 | |
| Cover letter to Mr. Ashworth of The Admiralty regarding English Steel Corporation's preference for using Vibrac for 40mm gun barrels. | 14th Sep 1940 | Box 176 \ 3 img133 | |
| Letter from English Steel Corporation regarding steel specifications for the 40 mm Gun Mk III barrel. | 8th Sep 1940 | Box 176 \ 3 img134 | |
| Drawings and material specifications for the first Admiralty gun intended for service trials. | 20th Sep 1940 | Box 176 \ 3 img135 | |
| Availability and suitability of rifle boring machines. | 24th Jun 1940 | Box 176 \ 3 img136 | |
| Rifle boring capabilities at Armstrong Whitworth for the Bofors gun. | 27th Jun 1940 | Box 176 \ 3 img137 | |
| Capability and availability of rifle boring machines for 13.2mm barrels. | 27th Jun 1940 | Box 176 \ 3 img138 | |
| Thank you note for information about rifle boring plant at Armstrong-Whitworths. | 30th Jun 1940 | Box 176 \ 3 img139 | |
| Reference sheet for correspondence with Armstrong Whitworth Co. Ltd. regarding rifling and boring equipment. | 30th Jun 1940 | Box 176 \ 3 img140 | |
| Need to acquire gun boring equipment for 20mm and 40mm guns. | 9th Jul 1940 | Box 176 \ 3 img141 | |
| Machining of parts and production capacity for 40 mm guns. | 16th Jul 1940 | Box 176 \ 3 img142 | |
| Letter from the Admiralty regarding the purchase of American machines for 40mm gun production. | 29th Jul 1940 | Box 176 \ 3 img143 | |
| Telephone conversation with Admiral Perry regarding the purchase of machine tools from the U.S.A. | 30th Jul 1940 | Box 176 \ 3 img144 | |
| Letter to the Admiralty Offices concerning the approval and procurement of American machine tools for 40mm gun barrel production. | 3rd Aug 1940 | Box 176 \ 3 img145 | |
| Letter to Captain Slater regarding the urgent need for machine tools for gun production during the war. | 5th Aug 1940 | Box 176 \ 3 img146 | |
| Preliminary list of general machine tools which could be used immediately. | 21th Nov 1938 | Box 176 \ 3 img147 | |
| Visit to The British Tool & Engineering Co. to assess production capacity for the 40 M/M Gun Mark III. | 9th Aug 1940 | Box 176 \ 3 img148 | |
| Inventory list of various machines, including Capstans, Lathes, and Millers, detailing their quantity, specifications, and condition. | 9th Aug 1940 | Box 176 \ 3 img149 | |
| List of miscellaneous, tool room, and hardening shop machinery and equipment. | 9th Aug 1940 | Box 176 \ 3 img150 | |
| Summary of factory work priorities, special tool production, and conclusions on manufacturing capabilities. | 9th Aug 1940 | Box 176 \ 3 img151 | |
| Alternative supplier, Builder's Iron Foundry, for barrel making equipment. | 17th Aug 1940 | Box 176 \ 3 img152 | |
| Letter to Machine Shop Equipment Ltd. regarding quotations for rifling and drilling machines and arranging a viewing. | 17th Aug 1940 | Box 176 \ 3 img153 | |
| Letter from Machine Shop Equipment Ltd concerning the availability and revised pricing of 'Builders' Rifling and Drilling Machines. | 21th Aug 1940 | Box 176 \ 3 img154 | |
| Quotation and technical discussion for various deep hole drilling and rifling machines. | 21th Aug 1940 | Box 176 \ 3 img155 | |
| Quotation for deep hole drilling machines and a rifling machine. | 21th Aug 1940 | Box 176 \ 3 img156 | |
| Statement of delivery and payment terms from Machine Shop Equipment Ltd. | 21th Aug 1940 | Box 176 \ 3 img157 | |
| Quotation for deep hole drilling, reaming, and rifling machines from Machine Shop Equipment Ltd. | 21th Aug 1940 | Box 176 \ 3 img158 | |
| Specification and terms sheet for Rifling Machinery, including dimensions, weight, and delivery details. | 23th Aug 1940 | Box 176 \ 3 img159 | |
| Letter to Machine Shop Equipment, Ltd. cancelling a request for quotations on rifling and drilling machines. | 23th Aug 1940 | Box 176 \ 3 img160 | |
| Procurement and modification of .500' Barrel Drilling Machines. | 21th Sep 1940 | Box 176 \ 3 img161 | |
| Letter from Machine Shop Equipment Ltd expressing disappointment that the machinery they offered had already been sourced elsewhere. | 9th Oct 1940 | Box 176 \ 3 img162 | |
| Letter from Machine Shop Equipment Ltd. enclosing leaflets for small Deep hole Reaming and Rifling machines. | 9th Oct 1940 | Box 176 \ 3 img163 | |
| Bulletin for a Builders Deep Hole Reaming Machine from the Builders Iron Foundry. | 9th Oct 1940 | Box 176 \ 3 img164 | |
| Descriptive sheet for a Builders Deep Hole Reaming Machine. | 9th Oct 1940 | Box 176 \ 3 img165 | |
| Description of the operation of a reaming machine with a photograph of the equipment. | 9th Oct 1940 | Box 176 \ 3 img166 | |
| Specification sheet for Long Bed and Short Bed Deep Hole Reaming Machines from Builders Iron Foundry. | 9th Oct 1940 | Box 176 \ 3 img167 | |
| Bulletin for a Builders Small Arms Rifling Machine. | 9th Oct 1940 | Box 176 \ 3 img168 | |
| The features and operation of a Builders Small Arms Rifling Machine. | 9th Oct 1940 | Box 176 \ 3 img169 | |
| Description of a motor-driven machine with an automatic cutting mechanism and lubrication system. | 9th Oct 1940 | Box 176 \ 3 img170 | |
| Specification sheet for a rifling machine from Builders Iron Foundry. | 12th Nov 1940 | Box 176 \ 3 img171 | |
| Letter to the Admiralty Offices regarding the shipment of three Pratt & Whitney machines from the USA. | 12th Nov 1940 | Box 176 \ 3 img172 | |
| Letter from the Admiralty regarding the re-allocation of Pratt & Whitney machines. | 18th Nov 1940 | Box 176 \ 3 img173 | |
| Letter to the Admiralty Offices regarding Pratt & Whitney Drilling & Rifling Machines. | 23th Nov 1940 | Box 176 \ 3 img174 | |
| Cable message requesting the delivery address for rifling machines. | 28th Nov 1940 | Box 176 \ 3 img175 | |
| Telegram confirming the diversion of Pratt Whitney machines to BSA Redditch. | 30th Nov 1940 | Box 176 \ 3 img176 | |
| Letter to John Howlett regarding the potential manufacture of gun parts and production targets. | 27th Jul 1940 | Box 176 \ 3 img177 | |
| Letter to Wellworthy Piston Rings regarding drawings for a 40 m/m MARK III Type B.D. Gun. | 12th Aug 1940 | Box 176 \ 3 img178 | |
| Letter concerning a list of mechanical assemblies and missing prints for associated parts. | 12th Jun 1940 | Box 176 \ 3 img179 | |
| Letter from a supplier acknowledging drawings for a 40 m/m gun and awaiting approval to proceed. | 14th Aug 1940 | Box 176 \ 3 img180 | |
| Letter to Wellworthy Piston Rings Ltd listing part number alterations for a 40mm Mark III Gun. | 16th Aug 1940 | Box 176 \ 3 img181 | |
| Letter to Wellworthy Piston Rings Ltd. regarding procedures for drawing alterations and code numbers. | 16th Aug 1940 | Box 176 \ 3 img182 | |
| Letter from Wellworthy Piston Rings Limited regarding drawings for a Mark III Gun. | 21th Aug 1940 | Box 176 \ 3 img183 | |
| Letter from Wellworthy Piston Rings regarding missing drawings and returning obsolete prints for the Mark III Gun. | 26th Aug 1940 | Box 176 \ 3 img184 | |
| Visit to the Ordnance Factory in Nottingham regarding capacity for barrel manufacturing. | 18th Jun 1940 | Box 176 \ 3 img185 | |
| Letter of introduction for Mr. Richard Taylor to Mr. Hollyoake at the Royal Ordnance Factory regarding potential manufacturing work. | 10th Jul 1940 | Box 176 \ 3 img186 | |
| Letter to R. Taylor, Esq., forwarding a copy of a letter sent to the Royal Ordnance Factory in Nottingham. | 10th Jul 1940 | Box 176 \ 3 img187 | |
| Letter from the Royal Ordnance Factory regarding the utilisation of machining capacity. | 12th Jul 1940 | Box 176 \ 3 img188 | |
| Letter of acknowledgement to Mr. Hollyoake at the Royal Ordnance Factory, Nottingham. | 14th Jul 1940 | Box 176 \ 3 img189 | |
| Cover letter to R. Taylor of Taylor Bros. Ltd. regarding a visit to the Royal Ordnance Factory, Nottingham. | 14th Jul 1940 | Box 176 \ 3 img190 | |
| Letter regarding the delivery schedule of experimental barrels and an inquiry about additional barrel-making capacity. | 25th Jul 1940 | Box 176 \ 3 img191 | |
| Letter from the Royal Ordnance Factory regarding a contract for barrel forgings and their issue schedule. | 8th Aug 1940 | Box 176 \ 3 img192 | |
| Letter to Mr. Healey concerning production rates, equipment arrival from the States, and operational timelines. | 10th Aug 1940 | Box 176 \ 3 img193 | |
| Noting the receipt of a letter from the Royal Ordnance Factory in Nottingham, with a copy attached. | 10th Aug 1940 | Box 176 \ 3 img194 | |
| Copy of a letter from R.O.F. Nottingham confirming a contract for barrel forgings and outlining a delivery schedule. | 8th Aug 1940 | Box 176 \ 3 img195 | |
| Attaching test certificates for eight 40mm barrel forgings dispatched to the Royal Ordnance Factory. | 20th Aug 1940 | Box 176 \ 3 img196 | |
| Notes on the production status of the Q.F. 2-Pounder Mk. 14 Gun. | 4th Aug 1940 | Box 176 \ 3 img197 | |
| Barrel manufacturing, sourcing from various factories, and production schedules for general machined parts. | 4th Aug 1940 | Box 176 \ 3 img198 | |
| Planning, tooling, materials, and heat-treatment considerations for gun manufacturing. | 4th Aug 1940 | Box 176 \ 3 img199 | |
| Sourcing and production of 'K parts', bought parts, and mountings for guns. | 4th Aug 1940 | Box 176 \ 3 img200 | |
| The production capacity of T. Grieve & Co., Ltd for the 40 m/m Gun Mark III. | 24th Jun 1940 | Box 176 \ 3 img201 | |
| Order for 50 barrels from the English Steel Corporation and safety margin agreements. | 24th Jun 1940 | Box 176 \ 3 img202 | |
| Letter from English Steel Corporation Ltd. concerning a 'Vibrac' steel order delay and the need for specific purpose details for priority. | 1st Jul 1940 | Box 176 \ 3 img203 | |
| Instructing the English Steel Corporation to commence production on 30 gun barrels. | 23th Sep 1940 | Box 176 \ 3 img204 | |
| Order for 60 gun barrel forgings from The English Steel Corporation. | 11th Jul 1940 | Box 176 \ 3 img205 | |
| Changes to barrel testing conditions and quantity requirements. | 25th Jul 1940 | Box 176 \ 3 img206 | |
| Visit to English Steel Corporation in Sheffield to check on delivery delays for 40 m/m gun barrel forgings. | 25th Jul 1940 | Box 176 \ 3 img207 | |
| Letter to the English Steel Corporation confirming delivery details for 40 m/m barrel forgings. | 25th Jul 1940 | Box 176 \ 3 img208 | |
| Letter from English Steel Corporation regarding the delivery schedule for 40mm barrel forgings. | 26th Jul 1940 | Box 176 \ 3 img209 | |
| Letter to the English Steel Corporation regarding a proposed order for 500 barrels and the required intervention of the Steel Controller. | 27th Jul 1940 | Box 176 \ 3 img210 | |
| Letter received from the English Steel Corporation regarding the first sixty barrel forgings. | 28th Jul 1940 | Box 176 \ 3 img211 | |
| Letter from the English Steel Corporation regarding the delivery schedule for 40mm barrel forgings. | 26th Jul 1940 | Box 176 \ 3 img212 | |
| Request to make a tracing of two drawings, 16836 S. and Q.1712, for record purposes. | 28th Jul 1940 | Box 176 \ 3 img213 | |
| The return and duplication of drawings from English Steel Corporation. | 30th Jul 1940 | Box 176 \ 3 img214 | |
| Blueprint for a 40mm barrel with testing instructions and material specifications. | 19th Jul 1940 | Box 176 \ 3 img215 | |
| Blueprint drawing for a machined V30 steel component for a Mark III assembly. | 19th Jul 1940 | Box 176 \ 3 img216 | |
| Blueprint cover sheet for a 40mm Barrel Mark III. | 1st Aug 1940 | Box 176 \ 3 img217 | |
| Letter from English Steel Corporation Ltd. regarding their inability to supply 500 barrels before 1942. | 1st Aug 1940 | Box 176 \ 3 img218 | |
| Letter to Commander Oswald of The Admiralty regarding the difficulty of obtaining barrel steel forgings. | 8th Aug 1940 | Box 176 \ 3 img219 | |
| Forwarding test certificates for seven 40 m/m barrel forgings supplied by English Steel Corporation for Admiralty approval. | 14th Mar 1940 | Box 176 \ 3 img220 | |
| Letter to English Steel Corporation regarding the preferred material for 40 mm gun barrels. | 5th Sep 1940 | Box 176 \ 3 img221 | |
| Letter from English Steel Corporation regarding steel specifications for the 40mm Gun Mark III Type B.D. | 8th Sep 1940 | Box 176 \ 3 img222 | |
| Inquiry to Messrs. Armstrong-Whitworth regarding their capacity for gun boring and rifling. | 30th Jun 1940 | Box 176 \ 3 img223 | |
| Letter from Sir W. G. Armstrong Whitworth & Co. declining a request for gun boring and rifling work due to machinery delays. | 5th Jul 1940 | Box 176 \ 3 img224 | |
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