| Description | Date | Identifier | |
| Extract of a memo discussing problems with coil springs for guns and referencing expert suppliers. | 13th Jul 1940 | Box 170 \ 4 img008 | |
| Letter to M. Olley of General Motors regarding gun models, gear lubrication, axle deflection, and spark plugs. | 13th Jul 1940 | Box 170 \ 4 img009 | |
| Component issues and production matters for spark plugs, springs, bearings, tractors, and die-castings. | 13th Jul 1940 | Box 170 \ 4 img010 | |
| Hydraulic transmissions, Zerol gears, and the North Dilution Scheme. | 13th Jul 1940 | Box 170 \ 4 img011 | |
| Dispatch request for a wooden model of a Breechblock and Barrel Extension to Maurice Olley at General Motors. | 15th Jul 1940 | Box 170 \ 4 img012 | |
| Letter regarding a drawing for a .5' gun and the production status of 40mm and 2' guns. | 17th Jul 1940 | Box 170 \ 4 img013 | |
| Cover note for information regarding barrel steels. | 17th Jul 1940 | Box 170 \ 4 img014 | |
| The material specifications and physical requirements for gun barrels and breech blocks. | 17th Jul 1940 | Box 170 \ 4 img015 | |
| Acceptance of straight carbon steel for a 13.2 mm barrel. | 17th Jul 1940 | Box 170 \ 4 img016 | |
| Confirmation of a cable with attached notes from Ringholz about a boring and rifling machine. | 19th Jul 1940 | Box 170 \ 4 img017 | |
| The costs and availability of machine tool equipment for rifling and boring 40mm barrels. | 17th Jul 1940 | Box 170 \ 4 img018 | |
| Airmail copy of a letter confirming a cable regarding a boring and rifling machine. | 19th Jul 1940 | Box 170 \ 4 img019 | |
| Letter detailing costs and specifications for machine tool equipment for rifling and boring a 40mm barrel. | 17th Jul 1940 | Box 170 \ 4 img020 | |
| Telegraph to the British Purchasing Commission for gun barrel machinery for the Admiralty. | 23th Jul 1940 | Box 170 \ 4 img021 | |
| List of details for a 13.2 m/m Machine Gun being sent to the strong room for dispatch to America. | 24th Jul 1940 | Box 170 \ 4 img022 | |
| Letter to M. Olley regarding the acquisition of machinery for the manufacture of 40 m/m barrels. | 24th Jul 1940 | Box 170 \ 4 img023 | |
| Letter to M. Olley in Detroit regarding manufacturing assistance for gun pieces. | 26th Jul 1940 | Box 170 \ 4 img024 | |
| Copy of a cable to Olley regarding the production status of equipment. | 10th Aug 1940 | Box 170 \ 4 img025 | |
| Specification of coil springs and recommending the use of load-deflection diagrams. | 10th Aug 1940 | Box 170 \ 4 img026 | |
| The best practice for defining and specifying coil springs for manufacturing. | 10th Aug 1940 | Box 170 \ 4 img027 | |
| Letter outlining the development and production position of the 40mm gun, including subcontracting in the United States. | 13th Sep 1940 | Box 170 \ 4 img028 | |
| Development work required on a half-inch gun before production can begin. | 13th Aug 1940 | Box 170 \ 4 img029 | |
| Alternative supplier, Builder's Iron Foundry, for barrel making equipment. | 17th Aug 1940 | Box 170 \ 4 img030 | |
| Letter to M. Olley in Detroit regarding sub-contracting quotations for difficult 40mm gun parts. | 18th Aug 1940 | Box 170 \ 4 img031 | |
| Requesting the dispatch of a wooden model and blueprints for a 40 mm Mark III B.S. Gun to General Motors in Detroit. | 18th Mar 1940 | Box 170 \ 4 img032 | |
| Letter concerning the cancellation of an enquiry for gun parts due to a decision by Lord Beaverbrook. | 25th Aug 1940 | Box 170 \ 4 img033 | |
| Page 2 of a letter regarding observation of bombing effects and coordination of information for engineers, including interest in Packard's manufacturing progress for sub-contracting. | 25th Aug 1940 | Box 170 \ 4 img034 | |
| Letter discussing the procurement of machinery and tools for gun manufacturing. | 29th Aug 1940 | Box 170 \ 4 img035 | |
| The manufacture of gun parts and machine tool requirements. | 29th Aug 1940 | Box 170 \ 4 img036 | |
| Letter detailing the procurement status of machines and tools for gun manufacturing, including barrels and breech mechanisms. | 29th Aug 1940 | Box 170 \ 4 img037 | |
| The manufacture of gun parts and quoting time requirements for turning 40mm barrels. | 30th Aug 1940 | Box 170 \ 4 img038 | |
| Steel specifications for gun barrels, referencing U.S. Arsenal practices and cancelling further inquiries. | 30th Aug 1940 | Box 170 \ 4 img039 | |
| Steel specifications for gun barrels, comparing Arsenal and S.A.E. standards. | 24th Aug 1940 | Box 170 \ 4 img040 | |
| Steel specifications, suppliers, heat treatment, and mechanical testing for barrel forgings. | 24th Aug 1940 | Box 170 \ 4 img041 | |
| Letter discussing tensile values and the transverse impact requirement for tests. | 30th Aug 1940 | Box 170 \ 4 img042 | |
| Types of steel used for gun barrels by the U.S. Arsenal. | 30th Aug 1940 | Box 170 \ 4 img043 | |
| Letter detailing gun barrel steel specifications and chemical analyses from Watertown Arsenal. | 24th Aug 1940 | Box 170 \ 4 img044 | |
| Metallurgical processes, heat treatment, and mechanical test requirements for steel supply. | 24th Aug 1940 | Box 170 \ 4 img045 | |
| Letter discussing tensile values and impact test requirements set by the Arsenal. | 7th Sep 1940 | Box 170 \ 4 img046 | |
| From the Detroit office to Derby discussing the lack of drawings for gun parts and questioning the argument to stop the job. | 7th Sep 1940 | Box 170 \ 4 img047 | |
| Cancellation of enquiries on gun parts, drawings, and machinery for production. | 7th Sep 1940 | Box 170 \ 4 img048 | |
| Wartime letter concerning delayed gun drawings due to censorship and the importance of American development information. | 29th Sep 1940 | Box 170 \ 4 img049 | |
| The sending of 13.2mm and 40mm gun drawings and models to America. | 30th Sep 1940 | Box 170 \ 4 img050 | |
| Listing part numbers for a 13.2 m/m machine gun for despatch to America. | 24th Jul 1940 | Box 170 \ 4 img051 | |
| List of gun drawings to be dispatched to America. | 2nd Jul 1940 | Box 170 \ 4 img052 | |
| Telegram regarding the status of detail prints for a forty-millimetre gun after a cancellation. | 4th Oct 1940 | Box 170 \ 4 img053 | |
| Letter concerning serials for guns and equipment, and the suspension of gun production in America. | 18th Oct 1940 | Box 170 \ 4 img054 | |
| Letter discussing magneto options for the Merlin engine and the status of gun manufacturing machinery. | 18th Oct 1940 | Box 170 \ 4 img055 | |
| Letter discussing armament projects with US contacts and commenting on the state of the automobile industry. | 24th Jul 1940 | Box 170 \ 4 img056 | |
| Sourcing of magnetos and progress on manufacturing 40 mm guns. | 18th Oct 1940 | Box 170 \ 4 img057 | |
| Letter discussing a wood model of a gun part, missing gun prints, and observations on the American automobile industry. | 24th Jul 1940 | Box 170 \ 4 img058 | |
| Phone message transcript regarding the status of Pratt & Whitney machines for forty-millimetre gun barrel manufacturing. | 18th Oct 1940 | Box 170 \ 4 img059 | |
| Letter concerning the delivery status and expediting of machine tool orders. | 19th Oct 1940 | Box 170 \ 4 img060 | |
| Confirming the shipment of a 12' Rotary Surface Grinder from the Arter Grinding Machine Company. | 16th Oct 1940 | Box 170 \ 4 img061 | |
| Letter from Bardons & Oliver Company confirming the shipment of nineteen Universal Turret Lathes. | 16th Oct 1940 | Box 170 \ 4 img062 | |
| Status of machine orders from Cincinnati Milling Machine Co. | 16th Oct 1940 | Box 170 \ 4 img063 | |
| Dispatch of a 3' Straight Bevel Gear Generator from Gleason Works. | 16th Oct 1940 | Box 170 \ 4 img064 | |
| Letter from The Heald Machine Co. confirming the shipment schedule for a 48-A Borematic machine. | 16th Oct 1940 | Box 170 \ 4 img065 | |
| Report from Pratt & Whitney Company detailing the delivery status and delays of various machine tool orders. | 16th Oct 1940 | Box 170 \ 4 img066 | |
| Report confirming the dispatch of six type B 6 x 18 machines from Thompson Grinder Co. | 16th Oct 1940 | Box 170 \ 4 img067 | |
| Summary table of outstanding machine orders and shipments from various suppliers. | 17th Oct 1940 | Box 170 \ 4 img068 | |
| Message taken over the phone regarding a parts proposal and shipment approval. | 19th Oct 1940 | Box 170 \ 4 img069 | |
| Letter to M. Olley discussing the production of a 40mm gun versus aviation engines, and the potential loss of associated prints. | 31th Oct 1940 | Box 170 \ 4 img070 | |
| Cover note for an attached extract on Guns from a letter received from Olley. | 1st Nov 1940 | Box 170 \ 4 img071 | |
| Progress report on the production of 40 m/m guns, detailing machinery, prints, and communications. | 18th Oct 1940 | Box 170 \ 4 img072 | |
| Communication regarding the secure storage of detail drawings for two guns in a bank vault. | 4th Nov 1940 | Box 170 \ 4 img073 | |
| Forwarding a copy of a cable from 'Oy.' concerning machines for the 40mm gun and handing the job over to the Admiralty. | 4th Nov 1940 | Box 170 \ 4 img074 | |
| Copy of a cable from Detroit, Michigan, regarding the shipment of machinery for gun manufacturing. | 1st Nov 1940 | Box 170 \ 4 img075 | |
| Letter to the Admiralty Offices regarding the shipment of three Pratt & Whitney machines from the States. | 12th Nov 1940 | Box 170 \ 4 img076 | |
| Copy of a letter from the Admiralty regarding the reallocation of Pratt & Whitney machines. | 18th Nov 1940 | Box 170 \ 4 img077 | |
| Letter to the Admiralty Offices regarding the use of Pratt & Whitney Drilling & Rifling Machines from the U.S.A. | 23th Nov 1940 | Box 170 \ 4 img078 | |
| Telegram requesting particulars and samples for Davis Helical gears. | 19th Mar 1941 | Box 170 \ 4 img079 | |
| Standardisation of chassis parts relating to a modified steering gear. | 10th Dec 1925 | Box 171 \ 1 img001 | |
| Standardisation of modified dust covers for rear brakes to prevent noise from grit. | 10th Dec 1925 | Box 171 \ 1 img002 | |
| Standardisation of chassis parts for a lightened flywheel and clutch. | 10th Dec 1925 | Box 171 \ 1 img003 | |
| Standardisation of chassis parts concerning the fixing for the radiator. | 29th Dec 1925 | Box 171 \ 1 img004 | |
| Standardisation of chassis parts, specifically the bracket for the rear silencer. | 4th Jan 1926 | Box 171 \ 1 img005 | |
| Proposal for a small gate change speed mechanism without notches to improve design. | 10th Dec 1925 | Box 171 \ 1 img006 | |
| Modifications to the change gear and brake operating mechanism. | 1st Jan 1926 | Box 171 \ 1 img007 | |
| Standardisation of chassis parts for the change gear and brake operating mechanism. | 10th Dec 1925 | Box 171 \ 1 img008 | |
| Standardisation of 1st and 2nd speed pinions to be made torsionally free to prevent gears working out. | 10th Dec 1925 | Box 171 \ 1 img009 | |
| Standardisation of chassis side members with extension for luggage grid and joggle moved 1 inch further back. | 12th Dec 1925 | Box 171 \ 1 img010 | |
| Standardisation of chassis side members with an extension for the luggage grid. | 12th Dec 1925 | Box 171 \ 1 img011 | |
| Standardisation of chassis parts, specifically for modified louvres on the bonnet to improve appearance. | 4th Feb 1926 | Box 171 \ 1 img012 | |
| Standardisation of chassis parts concerning the fixing of a spring in an air valve to improve reliability. | 11th Jan 1926 | Box 171 \ 1 img013 | |
| Standardisation of chassis parts regarding the modified position of accelerator pedals for 'B', 'C' & 'D' steering. | 19th Feb 1926 | Box 171 \ 1 img014 | |
| Standardisation of a felt strip on the engine guard to prevent mud ingress. | 9th Feb 1926 | Box 171 \ 1 img015 | |
| Standardisation of the chassis spare wheel carrier to improve reliability. | 8th Feb 1926 | Box 171 \ 1 img016 | |
| Sign-off sheet for the standardisation of the New Phantom spare wheel carrier coachwork features. | 27th Mar 1926 | Box 171 \ 1 img017 | |
| Proposal for the standardisation of bonnet fasteners for use on the 20 HP and 40/50 HP chassis. | 19th Feb 1926 | Box 171 \ 1 img018 | |
| Standardisation document for the approval of Wakefields 'XL' Oil as an alternative supply for chassis. | 16th Mar 1926 | Box 171 \ 1 img019 | |
| Standardisation report for using Wakefield's 'XL' Oil as an alternative supply to Prices oil. | 16th Mar 1926 | Box 171 \ 1 img020 | |
| Standardisation report on Wakefield's 'XL' oil as an alternative supply to Prices oil. | 16th Mar 1926 | Box 171 \ 1 img021 | |
| Standardisation of lubricating oils, comparing different brands and ingredients. | 24th Mar 1926 | Box 171 \ 1 img022 | |
| Standardisation of Chassis Parts - Steering Wheel 18' Diameter. | 16th Mar 1926 | Box 171 \ 1 img023 | |
| Standardisation of chassis parts, specifically the 18 inch diameter steering wheel. | 16th Mar 1926 | Box 171 \ 1 img024 | |
| Form for the standardisation of chassis parts, tracking changes in cost, weight, and implementation. | 7th Apr 1926 | Box 171 \ 1 img025 | |
| Standardisation of chassis parts for a luggage grid to improve the design and protect the petrol tank. | 30th Apr 1926 | Box 171 \ 1 img026 | |
| Standardisation of a special valve for the Autovac to reduce its effect on slow running. | 8th May 1926 | Box 171 \ 1 img027 | |
| Standardisation of a petrol tank with an improved side filler. | 30th Apr 1926 | Box 171 \ 1 img028 | |
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