| Description | Date | Identifier | |
| Sending a print of an experimental body subframe for a Hooper Cabriolet de Ville for India. | 13th Sep 1927 | Box 104 \ 3 scan0039 | |
| Benefits and issues of subframe body mounting for reducing vibrations and noise. | 24th Oct 1927 | Box 104 \ 3 scan0040 | |
| Special visit to Derby to test the method of carrying a car body on a separate under-frame. | 1st Nov 1924 | Box 104 \ 3 scan0041 | |
| Committee's report on tests for car body swaying and booming, including a trial of the Bradburn & Wedge device. | 22th Apr 1926 | Box 104 \ 3 scan0042 | |
| Desirability and practicality of using subframes on 40/50 and 20 HP chassis. | 22th Apr 1926 | Box 104 \ 3 scan0043 | |
| Selection of bodies and the use of subframes for 10,000-mile tests on 20 HP and 40/50 chassis. | 3rd Dec 1927 | Box 104 \ 3 scan0044 | |
| New forging for the rear spring front anchorage for the 'India 3' model, combined with an 'X' shaped cross member. | 14th Dec 1927 | Box 104 \ 3 scan0045 | |
| Sending layouts for the 'India 3' brake linkage, detailing modifications to the brackets and levers. | 20th Dec 1927 | Box 104 \ 3 scan0046 | |
| Alternative arrangement for the brake mechanism's carrier levers. | 31th Dec 1927 | Box 104 \ 3 scan0047 | |
| General arrangement and modifications for the 'India 3' car model. | 27th Feb 1928 | Box 104 \ 3 scan0048 | |
| Modifications to the tubular cross member for easier gearbox removal. | 6th Mar 1928 | Box 104 \ 3 scan0049 | |
| Alternative engine suspension designs for a 20 HP model, comparing blueprints. | 22th Mar 1928 | Box 104 \ 3 scan0050 | |
| Priority of 'India 3' improvements over the 20 HP chassis production. | 26th Mar 1928 | Box 104 \ 3 scan0051 | |
| Simplification of an engine suspension system to reduce the number of joints, parts, cost, and weight. | 12th Apr 1928 | Box 104 \ 3 scan0052 | |
| Use of nickel steel for a body subframe and the production of dies for chassis frames. | 31th May 1928 | Box 104 \ 3 scan0053 | |
| Telegram requesting three subframes for India to be delivered within a week. | 5th Jun 1920 | Box 104 \ 3 scan0054 | |
| Modifications to achieve lower frame heights, including axle, buffer clearance, and hypoid gear considerations. | 5th Jun 1928 | Box 104 \ 3 scan0055 | |
| Design, weight reduction, and production of a body sub-frame for the India 3 model. | 12th Jun 1928 | Box 104 \ 3 scan0056 | |
| Sourcing and fitting of various car bodies and subframes. | 23th Jun 1928 | Box 104 \ 3 scan0057 | |
| Typed memo discussing the provision of information to Derby for car completion. | 23th Jun 1928 | Box 104 \ 3 scan0058 | |
| Expressing frustration about the urgent production and dispatch of a subframe for India 3 to Lillie Hall. | 23th Jun 1928 | Box 104 \ 3 scan0059 | |
| Correspondence regarding the procurement and construction of three different car bodies for the 'First India 3' project. | 26th Jun 1928 | Box 104 \ 3 scan0060 | |
| Various rear-end arrangements for spare wheels and luggage for the 'India 3' model. | 29th Jun 1928 | Box 104 \ 3 scan0061 | |
| Proposed sheetmetal bracket to support the silencer on the X-shaped cross member for the India 3 exhaust system. | 3rd Jul 1928 | Box 104 \ 3 scan0062 | |
| Progress on a new 20 HP chassis, including new components, and a potential delay on the bodywork. | 17th Jul 1928 | Box 104 \ 3 scan0063 | |
| The omission of tie bars on the 'India 3' model due to minimal vertical deflection. | 22th Aug 1928 | Box 104 \ 3 scan0064 | |
| Instruction to order dies and six pairs of frames for India 4 frame side members. | 24th Oct 1928 | Box 104 \ 3 scan0065 | |
| Modifications to the front springs, side steering tube, and frame geometry. | 11th Nov 1928 | Box 104 \ 3 scan0066 | |
| Proposal to produce 50 steel underframes to improve coachbuilt bodies and facilitate the changeover to the SS Phantom model. | 7th Nov 1928 | Box 104 \ 3 scan0067 | |
| Results and advantages of experimental testing on body subframes over 3.5 years. | 10th Nov 1928 | Box 104 \ 3 scan0068 | |
| Special visit to Derby by the Coachwork Sub-Committee to test mounting a car body on a separate underframe. | 1st Nov 1924 | Box 104 \ 3 scan0069 | |
| Committee report on testing schemes to address car swaying and booming issues on 40/50 HP and 20 HP models. | 11th Nov 1928 | Box 104 \ 3 scan0070 | |
| Advantages of body subframes for reducing noise and simplifying body fitting to the chassis. | 11th Nov 1928 | Box 104 \ 3 scan0071 | |
| Proposing to offer the 20 HP model with a 3-inch longer frame to avoid losing orders and improve appearance. | 20th Nov 1928 | Box 104 \ 3 scan0072 | |
| Commercial viability of introducing a new 20 HP longer frame chassis alongside the existing model. | 23th Nov 1928 | Box 104 \ 3 scan0073 | |
| BJ to R regarding a study at Derby to alter the programme for making the G-4 type chassis. | 23th Nov 1928 | Box 104 \ 3 scan0074 | |
| Clearance issues encountered when fitting an India 1V subframe body to chassis No.14-G-1V. | 10th Dec 1928 | Box 104 \ 3 scan0075 | |
| Issues with mounting subframe bodies, covering battery box, front, and centre supports. | 2nd Dec 1928 | Box 104 \ 3 scan0076 | |
| Finalising the design and ordering a close-coupled coupe body to be built by Barker's. | 2nd Dec 1928 | Box 104 \ 3 scan0077 | |
| Secret memorandum detailing agreed-upon modifications for the India 4 model subframe and associated components. | 18th Dec 1928 | Box 104 \ 3 scan0078 | |
| Telegram from Rowbotham requesting a modification to the subframe centre cross member position. | 16th Apr 1931 | Box 104 \ 3 scan0079 | |
| Telegram received by telephone regarding the positioning of a subframe centre cross member. | 8th Jan 1929 | Box 104 \ 3 scan0080 | |
| The order and construction of a close-coupled all-weather car body with coachbuilder Barker & Co. | 12th Jan 1929 | Box 104 \ 3 scan0081 | |
| Query regarding a subframe modification for the India 4, chassis 16-G-4. | 21th Jan 1929 | Box 104 \ 3 scan0082 | |
| Request for the removal of the cross from a 12-G-4 chassis and the fitting of brake cable adaptors. | 28th Jan 1929 | Box 104 \ 3 scan0083 | |
| Agreed modifications to subframes for SS and India bodies. | 5th Feb 1929 | Box 104 \ 3 scan0084 | |
| Technical note discussing gearbox removal by jacking up the front end of the body. | 7th Feb 1929 | Box 104 \ 3 scan0085 | |
| Short memo confirming the dispatch of a sub-frame for Coupe No.16-G-4 to Barkers. | 7th Feb 1929 | Box 104 \ 3 scan0086 | |
| Technical discussion on chassis stiffness, periodicity, and the replacement of a cross-frame with tubular cross members for 20 HP & SS Chassis. | 14th Mar 1929 | Box 104 \ 3 scan0087 | |
| Continued discussion on the characteristics of smaller road wheels, noting their flexibility and tendency to bounce. | 25th Mar 1929 | Box 104 \ 3 scan0088 | |
| Use of tubular cross members to improve chassis stiffness and address vibration. | 25th Mar 1929 | Box 104 \ 3 scan0089 | |
| Exhaust boom issue on a 20 HP car and a proposed new exhaust system. | 27th Mar 1929 | Box 104 \ 3 scan0090 | |
| Sub-frame removed from a Barker Cabriolet body during refitting and returned for disposal. | 22th Apr 1929 | Box 104 \ 3 scan0091 | |
| Development stages and issues for the 20HP model, specifically concerning chassis variations codenamed 'China' and 'Japan'. | 9th May 1929 | Box 104 \ 3 scan0092 | |
| Modifications to the exhaust system, radiator movement, and frame stiffness. | 15th May 1929 | Box 104 \ 3 scan0093 | |
| Engine mounting modifications to reduce frame jellying and the resulting vibration issues. | 15th May 1929 | Box 104 \ 3 scan0094 | |
| 'jellying' trouble experienced with the 12-G-4 and 14-G-4 chassis frames. | 16th May 1929 | Box 104 \ 3 scan0095 | |
| Chassis and frame modifications, including steering options and a future 'Japan' chassis. | 24th Jun 1929 | Box 104 \ 3 scan0096 | |
| Refusal to agree to a batch of long-frame chassis until the type is thoroughly tested and standardised. | 28th Jun 1929 | Box 104 \ 3 scan0097 | |
| Cover note regarding the 20-HP Chassis with long frames, attaching a note from 'Sg'. | 18th Jul 1929 | Box 104 \ 3 scan0098 | |
| 'jellying' trouble and the standardization of long frames for the 20-HP Chassis. | 15th Jul 1929 | Box 104 \ 3 scan0099 | |
| Mileage testing of the 20 HP long frame chassis, noting its performance after modification. | 20th Aug 1929 | Box 104 \ 3 scan0100 | |
| Clarification on the standardisation of the 20 HP chassis to incorporate a 3-inch longer frame. | 23th Aug 1929 | Box 104 \ 3 scan0101 | |
| Urgent decision required for the 20 HP long frames for the 'R' series to prevent a production halt. | 15th Oct 1929 | Box 104 \ 3 scan0102 | |
| The ordering of additional long and short frames for 20 HP 'P' and 'R' series chassis. | 24th Oct 1929 | Box 104 \ 3 scan0103 | |
| Wheel arch clearances, potential issues with tyres rubbing, and design suggestions for the rear axle on the Phantom model. | 26th Oct 1929 | Box 104 \ 3 scan0104 | |
| Revised subframe and scuttle isolation for the 20HP model 14-G4. | 11th Nov 1929 | Box 104 \ 3 scan0105 | |
| Modifications for dropping a 20 HP radiator into the frame, including lengthening the bonnet. | 8th Nov 1929 | Box 104 \ 3 scan0106 | |
| New experimental enclosed limousine body for the 20-25 HP long chassis. | 11th Nov 1929 | Box 104 \ 3 scan0107 | |
| Letter to coachbuilder Park Ward & Co. about an experimental enclosed limousine for Mr. Royce. | 19th Nov 1929 | Box 104 \ 3 scan0108 | |
| Letter detailing bodywork specifications and referencing various design schemes for a car's radiator, scuttle, floor, and subframe. | 19th Nov 1929 | Box 104 \ 3 scan0109 | |
| Letter discussing a confidential car project, its subframe's similarity to the Phantom II, and its intended personal use by Mr. Royce. | 19th Nov 1929 | Box 104 \ 3 scan0110 | |
| Modifications to the body subframe for a 20/25HP long chassis. | 19th Nov 1929 | Box 104 \ 3 scan0111 | |
| Standardisation of chassis parts for the 20 HP long frame to enable raked steering. | 20th Aug 1929 | Box 104 \ 3 scan0112 | |
| Instructions regarding modifications to a 20/25 HP Experimental Enclosed Limousine subframe for Park Ward to accommodate a hypoid axle. | 12th Mar 1929 | Box 104 \ 3 scan0113 | |
| Visit report regarding the construction of a 20/25HP experimental limousine body by Park Ward & Co. | 17th Dec 1929 | Box 104 \ 3 scan0114 | |
| Experimental car subframe mounting, rubber supports, and tests on body booming and engine roughness. | 12th Mar 1930 | Box 104 \ 3 scan0115 | |
| Body mounting methods, contrasting rubber isolation with metal-to-metal contact. | 12th Mar 1930 | Box 104 \ 3 scan0116 | |
| Frame and radiator movement issues, referred to as 'jellying', on the 20 HP model and comparing it to the Phantom II. | 20th Mar 1930 | Box 104 \ 3 scan0117 | |
| Revised wingstays, crossmember, and lamp brackets for the 20/25 HP model. | 24th Apr 1930 | Box 104 \ 3 scan0118 | |
| Secret memo regarding a revision to the wiring for lamp brackets on the 20/25 HP chassis. | 3rd May 1930 | Box 104 \ 3 scan0119 | |
| Solutions for radiator jellying, frame torsion, and the benefits of uniform body mounting. | 5th May 1930 | Box 104 \ 3 scan0120 | |
| Methods for insulating a vehicle's power unit, body, and passengers from road vibrations. | 5th May 1930 | Box 104 \ 3 scan0121 | |
| Issues and required improvements for body mounting, subframes, and noise isolation. | 21th May 1930 | Box 104 \ 3 scan0122 | |
| Issues of booming, noise, and vibration in different coachbuilt bodies and potential solutions. | 21th May 1930 | Box 104 \ 3 scan0123 | |
| Recommendations for body mounting, scuttle isolation, and aprons for coachbuilders. | 24th May 1930 | Box 104 \ 3 scan0124 | |
| Mounting parts, extending the exhaust pipe, and using rubber supports to improve car smoothness. | 24th May 1930 | Box 104 \ 3 scan0125 | |
| Tests of completed cars highlighting issues with subframe support and body-to-brake drum alignment. | 26th Jun 1930 | Box 104 \ 3 scan0126 | |
| Tests of completed cars, detailing issues with subframe alignment and jigging, and a preference for a rubber-mounted central support. | 3rd Jul 1930 | Box 104 \ 3 scan0127 | |
| Supply and use of harder rubber buffers for scuttle isolation. | 3rd Jul 1930 | Box 104 \ 3 scan0128 | |
| Extract from a report on tests of completed cars, regarding the accuracy of subframe production. | 5th Jul 1930 | Box 104 \ 3 scan0129 | |
| Proposal for scheme 3162, a re-arrangement of the 25HP frame's cross members and brake gear to resolve complaints about 'pots'. | 1st Nov 1930 | Box 104 \ 3 scan0130 | |
| Use of a subframe for car bodies intended for 'Japan 3'. | 20th Jan 1931 | Box 104 \ 3 scan0131 | |
| Potential alterations to the front section of a frame for 'JAPAN 3'. | 29th Jan 1931 | Box 104 \ 3 scan0132 | |
| Suggestion to remove frame tie-bars on the Japan 3 model. | 2nd Feb 1931 | Box 104 \ 3 scan0133 | |
| Secret memo regarding the design and production of car bodies for 'Japan III', discussing blueprints and the use of subframes for secrecy. | 2nd Feb 1931 | Box 104 \ 3 scan0134 | |
| Recommending that 'Japan' III bodies be manufactured without subframes. | 7th Feb 1931 | Box 104 \ 3 scan0135 | |
| Reconsideration of using subframes on the Phantom II car model. | 7th Feb 1931 | Box 104 \ 3 scan0136 | |
| Review of the use and cost-effectiveness of subframes on 25 HP and Phantom II models. | 5th Mar 1931 | Box 104 \ 3 scan0137 | |
| Subframes, proposing to add the matter to the agenda for a Derby visit. | 9th Mar 1931 | Box 104 \ 3 scan0138 | |
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