| Description | Date | Identifier | |
| Letter to Hughes-Johnson Stampings Ltd. regarding forging designs and progress on connecting rods. | 25th Feb 1937 | Box 8 \ 3 03-page05 | |
| Letter from The Hughes-Johnson Stampings Ltd confirming a meeting with Mr. Reynolds. | 1st Mar 1937 | Box 8 \ 3 03-page06 | |
| Production and feasibility of using forge-finished connecting rods for the Wraith model. | 3rd Mar 1937 | Box 8 \ 3 03-page07 | |
| Letter to The Hughes-Johnson Stampings Ltd. requesting a progress update on forge finished connecting rods. | 20th Mar 1937 | Box 8 \ 3 03-page08 | |
| Letter from a drop-forging contractor regarding the production status of Con Rod dies. | 26th Mar 1937 | Box 8 \ 3 03-page09 | |
| Follow-up letter regarding the status of forged finished connecting rods being prepared by a supplier. | 13th Apr 1937 | Box 8 \ 3 03-page10 | |
| Letter from The Hughes-Johnson Stampings Ltd. regarding production difficulties with a connecting rod. | 19th Apr 1937 | Box 8 \ 3 03-page11 | |
| The investigation into producing forge-finished Wraith connecting rods. | 20th Apr 1937 | Box 8 \ 3 03-page12 | |
| Modification to the panel milling process for Wraith III & Bentley III connecting rods. | 15th Sep 1937 | Box 8 \ 3 03-page13 | |
| Instruction memo for parts related to the Wraith III Chassis connecting rod. | 23th Sep 1937 | Box 8 \ 3 03-page14 | |
| Instruction regarding new drawings and parts for the Wraith III Chassis Connecting Rod. | 1st Oct 1937 | Box 8 \ 3 03-page15 | |
| Cancelling a previous instruction for 6 sets of parts for the Wraith III Chassis Connecting Rod. | 28th Sep 1937 | Box 8 \ 3 03-page16 | |
| Release of 100 sets of connecting rods and bearings for the Wraith III, detailing three alternative bearing options. | 28th Jan 1938 | Box 8 \ 3 03-page17 | |
| The Connecting Rod Bush for Wraith III & Bentley III models. | 8th Feb 1938 | Box 8 \ 3 03-page18 | |
| New blueprints for a Wraith III chassis connecting rod with no shims and flanged bushes. | 13th May 1938 | Box 8 \ 3 03-page19 | |
| Request to supply a complete Wraith con-rod as a sample to be sent to America with A.C.9 alloy. | 8th Nov 1938 | Box 8 \ 3 03-page20 | |
| Proposal to test new 'Karc' bronze connecting rod bushes (E.51375) to reduce scrap caused by porosity. | 9th Jan 1939 | Box 8 \ 3 03-page21 | |
| The trial of 'Karo' Bronze little end bushes for Wraith connecting rods. | 11th Jan 1939 | Box 8 \ 3 03-page22 | |
| Producing and fitting four sets of 'Karo' Bronze little end bushes for the Wraith connecting rod. | 23th Jan 1939 | Box 8 \ 3 03-page23 | |
| Allocation and fitting instructions for 'Karo' and Vandervell bushes in connecting rods for various units. | 23th Jan 1939 | Box 8 \ 3 03-page24 | |
| Cost comparison for Wraith connecting rod bushes using Carobronze Tube versus BZ/FC Cast Bar. | 3rd Feb 1939 | Box 8 \ 3 03-page25 | |
| Departmental memo discussing axle clearances and the design of a chassis for a worm geared axle. | 12th May 1911 | Box 8 \ 4 04-page001 | |
| Expressing a strong opinion against the design of an arched back axle. | 30th May 1911 | Box 8 \ 4 04-page002 | |
| List comparing axle clearance measurements of various competitor motor cars. | 4th Oct 1911 | Box 8 \ 4 04-page003 | |
| Departmental memo regarding Mud Guards, circulating a letter from Mr. Johnson. | 4th Oct 1911 | Box 8 \ 4 04-page004 | |
| Dangerous mud-guards on a trial car and a directive to stop calling it the 'Speed Car'. | 3rd Oct 1911 | Box 8 \ 4 04-page005 | |
| Instruction to arrange a minimum clearance of .015' for crankshaft bearings, with an exception for the main rear bearing. | 20th Oct 1911 | Box 8 \ 4 04-page006 | |
| Manufacture of cars with greater clearance for the Indian business. | 27th Nov 1911 | Box 8 \ 4 04-page007 | |
| Minutes from a meeting discussing increasing road clearance for Colonial and Indian cars. | 30th Nov 1911 | Box 8 \ 4 04-page008 | |
| Hand-drawn dimensional comparison between the '1700 Type' and '1700 Colonial Type' models. | 1st Mar 1911 | Box 8 \ 4 04-page009 | |
| Ground clearance modifications for 'Colonial' cars, specifically the fitting of smaller flywheels and spring drive couplings. | 2nd May 1912 | Box 8 \ 4 04-page010 | |
| Letter to Mr. Johnson regarding discrepancies in ground clearance between drawings and the actual chassis produced. | 20th May 1912 | Box 8 \ 4 04-page011 | |
| Vehicle clearances for different wheel sizes and outlining potential modifications to increase it, with a note on chassis 1875. | 20th May 1912 | Box 8 \ 4 04-page012 | |
| Ground clearance options for Mr Morris's new car with various modifications and the logistics of changing flywheels. | 21th May 1912 | Box 8 \ 4 04-page013 | |
| Departmental memo demanding an explanation for a serious discrepancy in flywheel guard clearance measurements between drawings and the actual chassis. | 21th May 1912 | Box 8 \ 4 04-page014 | |
| Departmental memo regarding the differing flywheel guard clearances on standard and Colonial type chassis. | 21th May 1912 | Box 8 \ 4 04-page015 | |
| Departmental memo regarding the stopping of chassis delivery to change flywheels, impacting ground clearance and engine performance. | 31th May 1912 | Box 8 \ 4 04-page016 | |
| List of ground clearance measurements for the 1900 Chassis. | 3rd Jun 1912 | Box 8 \ 4 04-page017 | |
| List of ground clearance measurements for the 1800 Type Chassis. | 3rd Jun 1912 | Box 8 \ 4 04-page018 | |
| Departmental memo requesting a Technical Committee meeting to review a 5/8' ground clearance. | 3rd Jun 1912 | Box 8 \ 4 04-page019 | |
| Departmental memo confirming the handover of clearance sheets for 1800 and 1900 type chassis. | 5th Jun 1912 | Box 8 \ 4 04-page020 | |
| From Mr Spinney to Mr Nadin regarding ground clearances with different wheel and flywheel sizes. | 16th Apr 1912 | Box 8 \ 4 04-page021 | |
| Departmental memo regarding ground clearances, referencing two attached memos. | 5th Jun 1912 | Box 8 \ 4 04-page022 | |
| Departmental memo following up on a query regarding ground clearance. | 5th Jun 1912 | Box 8 \ 4 04-page023 | |
| Departmental memo discussing the road clearance of the 1900 series vehicle based on different flywheel and wheel sizes. | 6th Jun 1912 | Box 8 \ 4 04-page024 | |
| Vehicle road clearance calculations based on wheel size and addressing an error where tinsmiths deviated from drawings. | 3rd May 1912 | Box 8 \ 4 04-page025 | |
| Departmental memo discussing committee recommendations for increasing clearance on Colonial cars for Mr Royce's consideration. | 3rd May 1912 | Box 8 \ 4 04-page026 | |
| Copy of a memo from F.H. Royce to Claude Johnson regarding road clearance and the slope of the transmission. | 13th Jun 1912 | Box 8 \ 4 04-page027 | |
| To the Technical Committee regarding ground clearance and flywheel guards. | 20th Jun 1912 | Box 8 \ 4 04-page028 | |
| Departmental memo regarding difficulties in achieving the specified ground clearance for a chassis model. | 22th Jun 1912 | Box 8 \ 4 04-page029 | |
| Departmental memo specifying minimum ground clearances for various chassis types based on flywheel and wheel sizes. | 3rd May 1912 | Box 8 \ 4 04-page030 | |
| Departmental memo discussing chassis ground clearance and the rationale for spring setup to handle maximum load. | 3rd May 1912 | Box 8 \ 4 04-page031 | |
| Vehicle ground clearance, specifically concerning the silencer, spring camber, and flywheel guard. | 3rd May 1912 | Box 8 \ 4 04-page032 | |
| Departmental memo regarding insufficient ground clearance on a chassis and the need to alter specifications. | 3rd May 1912 | Box 8 \ 4 04-page033 | |
| Clarification on the information required for ground and road clearance on chassis 2006. | 26th Jun 1912 | Box 8 \ 4 04-page034 | |
| Request for road clearance information for a chassis with different tyre and axle setups. | 27th Jun 1912 | Box 8 \ 4 04-page035 | |
| Cover letter forwarding minutes from T.C. meetings concerning petrol tank supports, front floorboards, and ground clearance. | 28th Jun 1912 | Box 8 \ 4 04-page036 | |
| Road clearance for Chassis 2006 with different tyre and axle configurations. | 29th Jun 1912 | Box 8 \ 4 04-page037 | |
| The results of ground clearance tests on three different car chassis under flat spring camber conditions. | 2nd Jul 1912 | Box 8 \ 4 04-page038 | |
| Departmental memo discussing frame bend tests, clearances, and potential modifications for future car chassis. | 22th May 1912 | Box 8 \ 4 04-page039 | |
| Departmental memo detailing the components used for tests, including a standard chassis, large flywheel, and wheel dimensions. | 22th May 1912 | Box 8 \ 4 04-page040 | |
| Chassis modifications and ground clearances for different flywheel and wheel combinations. | 4th Jul 1912 | Box 8 \ 4 04-page041 | |
| Clearance measurements for three specific chassis (2025E, 2027, and 2028). | 4th Jul 1912 | Box 8 \ 4 04-page042 | |
| Chassis frame testing, detailing measurements and observations on deflection under load. | 4th Jul 1912 | Box 8 \ 4 04-page043 | |
| Chassis frame trussing, clearances, and future car transmission design. | 4th Jul 1912 | Box 8 \ 4 04-page044 | |
| Note on improving clearance by fitting a small flywheel. | 11th Jul 1912 | Box 8 \ 4 04-page045 | |
| Ground clearance, specifically discussing the standardization of exhaust pipes and flywheels. | 11th Jul 1912 | Box 8 \ 4 04-page046 | |
| Concluding page of a typed memo by T.B. Barrington. | 15th Jul 1912 | Box 8 \ 4 04-page047 | |
| Departmental memo regarding ground clearance and slipping issues with cotton fabric clutches. | 15th Jul 1912 | Box 8 \ 4 04-page048 | |
| Departmental memo concerning vehicle ground clearance specifications. | 25th Jul 1912 | Box 8 \ 4 04-page049 | |
| Customer complaint about a flywheel striking the road on a new car. | 31th Jul 1912 | Box 8 \ 4 04-page050 | |
| Letter detailing a safety concern about the low clearance of the flywheel shield on certain bridges. | 2nd Aug 1912 | Box 8 \ 4 04-page051 | |
| Departmental memo concerning a customer complaint from a Mr. Whittington and the proposed solution of fitting a smaller flywheel. | 2nd Aug 1912 | Box 8 \ 4 04-page052 | |
| Letter regarding car availability over the winter and a concern about a smaller flywheel. | 5th Aug 1912 | Box 8 \ 4 04-page053 | |
| Letter regarding the fitting of larger wheels and tyres. | 7th Aug 1912 | Box 8 \ 4 04-page054 | |
| Letter to a customer regarding the fitting of a smaller fly-wheel and the option of larger wheels for clearance. | 7th Aug 1912 | Box 8 \ 4 04-page055 | |
| Departmental memo discussing ground clearance tests, comparing inverted and three-quarter elliptic springs. | 16th Aug 1912 | Box 8 \ 4 04-page056 | |
| Departmental memo requesting a copy of test results for internal records. | 3rd May 1912 | Box 8 \ 4 04-page057 | |
| Departmental memo discussing the road clearance under the flywheel guard for chassis 1872. | 17th Aug 1912 | Box 8 \ 4 04-page058 | |
| Page two of a departmental memo about alterations required beyond fitting a light flywheel for a customer. | 22th May 1912 | Box 8 \ 4 04-page059 | |
| Customer complaint regarding flywheel clearance on Chassis 1872. | 19th Aug 1912 | Box 8 \ 4 04-page060 | |
| Departmental memorandum concerning a flywheel and wheel clearance issue on Mr Whittington's car, number 1872. | 22th Aug 1912 | Box 8 \ 4 04-page061 | |
| Departmental memo regarding modifications to increase a customer's car clearance by possibly fitting a smaller flywheel and larger wheels. | 3rd Sep 1912 | Box 8 \ 4 04-page062 | |
| Ground clearance on bumpy roads, gradient measurement accuracy, and a failed hill start test. | 12th Sep 1912 | Box 8 \ 4 04-page063 | |
| Departmental memo commenting on a car's ability to climb a 35% gradient. | 22th May 1912 | Box 8 \ 4 04-page064 | |
| Insufficient ground clearance on car 1739, causing the flywheel guard to foul on roads in Scotland. | 15th Sep 1912 | Box 8 \ 4 04-page065 | |
| Memo detailing poor road conditions and the unsuitability for a modern car, with observations of other vehicles. | 30th Apr 1912 | Box 8 \ 4 04-page066 | |
| Memo about a location near Nisy where the King goes to shoot. | 15th Oct 1912 | Box 8 \ 4 04-page067 | |
| To Mr. Johnson concerning an investigation into gauges for road clearance. | 15th Oct 1912 | Box 8 \ 4 04-page068 | |
| The correct positioning of parts relative to the side members of the frame. | 8th Oct 1937 | Box 8 \ 4 04-page069 | |
| To Mr. Barrington concerning Mr. Royce's opinion on road clearance issues for standard practice chassis. | 28th Oct 1912 | Box 8 \ 4 04-page070 | |
| To Mr Platford regarding Mr Royce's opinion on road clearance issues. | 29th Oct 1912 | Box 8 \ 4 04-page071 | |
| Improvements to front suspension, suggesting increased clearance or camber to prevent breakages. | 15th Dec 1913 | Box 8 \ 4 04-page072 | |
| Ground clearance of a proposed new chassis. | 13th May 1926 | Box 8 \ 4 04-page073 | |
| Undershield ground clearance issues and proposing a new testing method. | 14th Jun 1926 | Box 8 \ 4 04-page074 | |
| The minimum passable ground clearance for the undershield on 20-HP and 40/50 HP chassis. | 16th Jun 1926 | Box 8 \ 4 04-page075 | |
| Modifying the 20 HP undershield to improve ground clearance. | 8th Jun 1926 | Box 8 \ 4 04-page076 | |
| Modifications to the 20HP model undershields to prevent mud splashing and increase road clearance. | 1st Jul 1926 | Box 8 \ 4 04-page077 | |
| Sketch illustrating the 'India' change-speed mechanism and its floorboard clearances. | 7th May 1927 | Box 8 \ 4 04-page078 | |
| Need to adjust road clearance based on driving experience on bumpy roads in France. | 7th May 1927 | Box 8 \ 4 04-page079 | |
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