| Description | Date | Identifier | |
| Telegram from Royce regarding specifications for instrument patch, controls, and springs for the first cars. | 5th Apr 1929 | Box 14 \ 5 Scan107 | |
| Confirming verbal instructions for the design and material thickness of the S.S. Engine Foot. | 5th Apr 1929 | Box 14 \ 5 Scan108 | |
| Rubber strips F.80800 for experimental chassis work, with information from the Avon India Rubber Co. | 12th Apr 1929 | Box 14 \ 5 Scan109 | |
| Use of a distance bush in rubber engine feet for experimental cars. | 13th Apr 1929 | Box 14 \ 5 Scan110 | |
| The decision to retain the distance bush in rubber engine feet for the WW design. | 13th Apr 1929 | Box 14 \ 5 Scan111 | |
| Technical query letter regarding the design and effects of a body subframe, with handwritten answers. | 10th Jun 1929 | Box 14 \ 5 Scan112 | |
| Letter from Maurice Olley of Rolls Royce of America discussing technical queries and the adoption of subframes. | 12th Jun 1929 | Box 14 \ 5 Scan113 | |
| Request to fit diabolo rubber engine feet to car 20-EX. | 12th Jun 1929 | Box 14 \ 5 Scan114 | |
| 'SS' engine feet, detailing their function in providing torsional rigidity and isolating high-frequency vibrations. | 1st Jun 1929 | Box 14 \ 5 Scan115 | |
| Blueprint of a rubber engine feet distance piece. | 14th Jun 1929 | Box 14 \ 5 Scan116 | |
| The reverse side of a document with a purple ink stamp from the Print Room. | 14th Jun 1929 | Box 14 \ 5 Scan117 | |
| Quality of rubber for engine mountings, comparing suppliers. | 20th Jun 1929 | Box 14 \ 5 Scan118 | |
| Issues and tests related to engine suspension and engine coupling. | 21th Jun 1929 | Box 14 \ 5 Scan119 | |
| Testing and improving a fabric coupling, comparing riveting with screwed thimble methods. | 21th Jun 1929 | Box 14 \ 5 Scan120 | |
| Technical note answering questions about the specifications and effects of body subframes. | 21th Jun 1929 | Box 14 \ 5 Scan121 | |
| Subframe construction, seat mounting, floor design, and sealing. | 2nd May 1929 | Box 14 \ 5 Scan122 | |
| Agreed modifications for chassis subframes, based on experience with SS and India bodies. | 2nd May 1929 | Box 14 \ 5 Scan123 | |
| Difficulties of fitting S.S. bodies to chassis and proposing the use of a special rig as a solution. | 17th Apr 1929 | Box 14 \ 5 Scan124 | |
| Supply of subframe brackets and templates to coachbuilders. | 29th Apr 1929 | Box 14 \ 5 Scan125 | |
| Interchangeability of subframes and chassis for coachbuilders. | 29th Apr 1929 | Box 14 \ 5 Scan126 | |
| Challenges and process for coachbuilders creating the first batch of bodies. | 1st May 1929 | Box 14 \ 5 Scan127 | |
| Difficulties and solutions for mounting subframes on the S.S. model. | 1st May 1929 | Box 14 \ 5 Scan128 | |
| Blueprint of a mechanical component with handwritten annotations for design modification. | 21th Jun 1929 | Box 14 \ 5 Scan129 | |
| Secret internal memorandum detailing the objectives for redesigning SS cars, including advice for coachbuilders on weight distribution. | 16th Sep 1929 | Box 14 \ 5 Scan130 | |
| Improvements in chassis clearance, performance, induction, and central oiling systems. | 16th Sep 1929 | Box 14 \ 5 Scan131 | |
| Specification document detailing the transmission, clutch, gearbox, propeller shaft, and rear axle components. | 16th Sep 1929 | Box 14 \ 5 Scan132 | |
| Description of the vehicle's suspension system, detailing the semi-elliptic springs and hydraulic dampers. | 16th Sep 1929 | Box 14 \ 5 Scan133 | |
| The lubrication system, frame, and steering gear of a vehicle. | 16th Sep 1929 | Box 14 \ 5 Scan134 | |
| Technical description of improvements made to the front axle, road wheels, radiator, battery, and body mounting. | 16th Sep 1929 | Box 14 \ 5 Scan135 | |
| Improvements to the instruments and engine design of a chassis. | 16th Sep 1929 | Box 14 \ 5 Scan136 | |
| Summary of engine and vehicle improvements, including a new vacuum pump, electric starter, and a list of advancements in performance, handling, and comfort. | 18th Sep 1929 | Box 14 \ 5 Scan137 | |
| Technical note on the S.S. Suspension, detailing its springs, lubrication, and handling characteristics compared to the Phantom model. | 18th Sep 1929 | Box 14 \ 5 Scan138 | |
| Adjustments to shock absorbers to balance riding qualities at different speeds. | 4th Nov 1929 | Box 14 \ 5 Scan139 | |
| The trial and comparison of the Farnsworth suspension system. | 4th Nov 1929 | Box 14 \ 5 Scan140 | |
| The development challenges of applying an independently sprung wheel system to a high-speed car. | 4th Nov 1929 | Box 14 \ 5 Scan141 | |
| Technical drawing of a lubricated cantilever spring. | 12th Nov 1929 | Box 14 \ 5 Scan142 | |
| Drawing cancellation due to oil leaks. | 21th Jan 1930 | Box 14 \ 5 Scan143 | |
| Instructions to investigate and rectify issues with engine feet and pivot lean on a vehicle. | 21th Jan 1930 | Box 14 \ 5 Scan144 | |
| Recommendation to use a harder rubber for semi-isolation bushes and washers, as the current material is too soft. | 6th Feb 1930 | Box 14 \ 5 Scan145 | |
| Solutions for radiator shimmy on the Phantom II, including body suspension modifications and experiments. | 10th Feb 1930 | Box 14 \ 5 Scan146 | |
| Proposal with a sketch for a body suspension experiment to address radiator shimmy. | 11th Feb 1930 | Box 14 \ 5 Scan147 | |
| Using a harder rubber for semi-isolation pieces to address radiator shimmy. | 11th Feb 1930 | Box 14 \ 5 Scan148 | |
| Test results for an engine foot mounted shock damper, showing deflection measurements under various loads. | 10th Mar 1930 | Box 14 \ 5 Scan149 | |
| Typed note discussing the stiffness of a cross shaft and the potential for redesigning a damper. | 3rd Mar 1930 | Box 14 \ 5 Scan150 | |
| Confirming the handover of a fixing for a three-point engine suspension experiment. | 3rd Mar 1930 | Box 14 \ 5 Scan151 | |
| 'Jellying Experiment' on a three-point engine suspension, requesting a part to be made from a schedule print. | 3rd Mar 1930 | Box 14 \ 5 Scan152 | |
| Persistent engine vibration issues in Phantom II and 20 HP models. | 20th Mar 1930 | Box 14 \ 5 Scan153 | |
| Body construction issues, specifically regarding boom periods in limousines. | 28th Mar 1930 | Box 14 \ 5 Scan154 | |
| Instructions for fitting a single point front engine mounting on a 20-EX chassis. | 28th Mar 1930 | Box 14 \ 5 Scan155 | |
| Instructions for replacing solid rear engine feet with Diobolo rubber blocks for road testing. | 7th Apr 1930 | Box 14 \ 5 Scan156 | |
| Phantom II suspension tests involving different front road spring ratings to address pitching and radiator 'jellying'. | 12th Apr 1930 | Box 14 \ 5 Scan157 | |
| Solutions for 'radiator jellying', body mounting, and vehicle vibrations. | 5th May 1930 | Box 14 \ 5 Scan158 | |
| Methods for insulating the power unit, body, and passengers within a vehicle. | 25th May 1930 | Box 14 \ 5 Scan159 | |
| The development and fitting of a new engine mounting for the 22-EX model. | 8th May 1930 | Box 14 \ 5 Scan160 | |
| Issues and suggestions regarding body mounting, subframe isolation, and various fittings. | 21th May 1930 | Box 14 \ 5 Scan161 | |
| Causes and potential solutions for 'booming' noises in coachbuilt car bodies. | 21th May 1930 | Box 14 \ 5 Scan162 | |
| Issues related to body mounting, scuttle isolation, and aprons for coachbuilders. | 24th May 1930 | Box 14 \ 5 Scan163 | |
| Chassis modifications, including rubber subframe supports and exhaust pipe extensions. | 24th May 1930 | Box 14 \ 5 Scan164 | |
| Testing and issues with the second left-hand drive chassis 25-EX, detailing a 'boom' noise, overheating, and exhaust failure. | 14th Jul 1930 | Box 14 \ 5 Scan165 | |
| Page two of a letter discussing a trip to France to meet with Hancock. | 12th Jan 1931 | Box 14 \ 5 Scan166 | |
| Experience with 'Diamond' engine mountings and torque reaction dampers on the 40/50 and 25 HP models. | 12th Jan 1931 | Box 14 \ 5 Scan167 | |
| Progress report on a scheme for converting crankcases to a diamond mounting system. | 5th Feb 1931 | Box 14 \ 5 Scan168 | |
| Blueprint and construction for a diamond suspension power unit mounting. | 7th Feb 1931 | Box 14 \ 5 Scan169 | |
| With sketches proposing a new design for an engine front support. | 10th Feb 1931 | Box 14 \ 5 Scan170 | |
| Development of a front suspension system for diamond mounting. | 14th Feb 1931 | Box 14 \ 5 Scan171 | |
| Potential car improvements concerning torque reactions and flywheel vibration. | 23th Feb 1931 | Box 14 \ 5 Scan172 | |
| Blueprint revision for the engine front suspension, including pivot pin fixing options. | 23th Feb 1931 | Box 14 \ 5 Scan173 | |
| Proposed test for a modified anti-jellying engine mounting scheme using bell cranks and a push-pull rod. | 28th Feb 1931 | Box 14 \ 5 Scan174 | |
| Parts request for converting front engine feet to use thicker rubber strips. | 16th Mar 1931 | Box 14 \ 5 Scan175 | |
| Proposal for engine mountings using a parallel motion linkage with flexible links to manage torsional oscillation and thermal expansion. | 3rd Mar 1931 | Box 14 \ 5 Scan176 | |
| Engine mounting and frame design to address vibration issues, comparing with Bentley and Hispano. | 18th Mar 1931 | Box 14 \ 5 Scan177 | |
| Engine mounting designs, frame rigidity, and vibration issues in various cylinder configurations. | 25th Mar 1931 | Box 14 \ 5 Scan178 | |
| Engine vibrations, body booms, and proposed modifications to the engine mounting and flywheel. | 25th Mar 1931 | Box 14 \ 5 Scan179 | |
| Cure for torsional vibration of the crankshaft or flywheel whirling. | 31th Mar 1931 | Box 14 \ 5 Scan180 | |
| Effects of removing rear engine feet from cars to address body booms. | 31th Mar 1931 | Box 14 \ 5 Scan181 | |
| Body booms and the relationship between engine vibrations and frame stiffness. | 8th Apr 1931 | Box 14 \ 5 Scan182 | |
| Improvements to chassis stiffness, engine mounting, and suspension design. | 8th Apr 1931 | Box 14 \ 5 Scan183 | |
| Issues with a 6 cylinder engine, chassis rigidity, body booms, and proposed static tests. | 18th Apr 1931 | Box 14 \ 5 Scan184 | |
| Customer complaints regarding vehicle 'booms' by modifying the rear engine feet and column support. | 18th Apr 1931 | Box 14 \ 5 Scan185 | |
| Standardisation for removing rear engine feet on the Phantom II model. | 21th Apr 1931 | Box 14 \ 5 Scan186 | |
| Testing of torque reaction dampers and diamond engine mountings on experimental cars. | 23th Apr 1931 | Box 14 \ 5 Scan187 | |
| Car engine suspension, mounting, and vibration damping for P.2. and J.1. models. | 7th May 1931 | Box 14 \ 5 Scan188 | |
| Despatch of torque reaction damper friction discs. | 9th May 1931 | Box 14 \ 5 Scan189 | |
| Confirming the despatch of a pair of friction discs as requested. | 9th May 1931 | Box 14 \ 5 Scan190 | |
| Request for samples of oil-soaked cotton linings from torque and shimmy dampers for an experiment. | 16th May 1931 | Box 14 \ 5 Scan191 | |
| Modified engine mounting to cure booms. | 19th May 1931 | Box 14 \ 5 Scan192 | |
| Proposal for a 10,000-mile endurance test of a Phantom II car in France to evaluate engine mounting modifications. | 20th May 1931 | Box 14 \ 5 Scan193 | |
| Proposed modifications and component trials for a vehicle. | 20th May 1931 | Box 14 \ 5 Scan194 | |
| List of proposed component updates and tests for L.H. cars, including a 25-KX model for France. | 20th May 1931 | Box 14 \ 5 Scan195 | |
| Proposing modifications for the P.2. vehicle's 10,000-mile trial, concerning front suspension and engine flywheel flutter. | 22th May 1931 | Box 14 \ 5 Scan196 | |
| Reducing engine noise and addressing crankshaft torsional vibrations across a range of speeds. | 22th May 1931 | Box 14 \ 5 Scan197 | |
| The poundage settings for torque reaction dampers with diamond mounting for the Phantom 11. | 22th May 1931 | Box 14 \ 5 Scan198 | |
| Delay in work on the P. 2 diamond engine mounting and an attached blueprint. | 5th May 1931 | Box 14 \ 5 Scan199 | |
| 10,000-mile test, engine mounting schemes, frame deflection, and balance weights for the 25-EX car before sending it to France. | 28th May 1931 | Box 14 \ 5 Scan200 | |
| High-speed engine experiments, discussing carburettors, ignition accessibility, and vibration. | 28th May 1931 | Box 14 \ 5 Scan201 | |
| 45HP conversion mounting, discussing its lateral stiffness and damping properties. | 28th May 1931 | Box 14 \ 5 Scan202 | |
| Frame distortion tests measuring the effect of engine mounting types on torsional frame stiffness and front end jellying. | 29th May 1931 | Box 14 \ 5 Scan203 | |
| Report comparing test results for 'jellying' and damping on various car models with different engine mountings. | 2nd May 1933 | Box 14 \ 5 Scan204 | |
| Series of five graphs comparing frame deflection tests under different vehicle configurations. | 28th May 1931 | Box 14 \ 5 Scan205 | |
| Unreadable document page stamped by the Print Room in Derby. | 29th May 1931 | Box 14 \ 5 Scan206 | |
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