| Description | Date | Identifier | |
| Short internal memo from BJ to Hs regarding consulting 'R' for approval on suggested steps. | 27th Jun 1927 | Box 66 \ 3 scan0176 | |
| Discussion about deleting rear bonnet shutters on the 40/50 HP model and considering cheaper alternatives. | 7th Jul 1927 | Box 66 \ 3 scan0177 | |
| Deletion of rear shutters and bonnet louvres on Phantom & Goshawk models. | 1st Jul 1927 | Box 66 \ 3 scan0178 | |
| Deletion of rear bonnet shutters for the 40/50 HP model. | 5th Jul 1927 | Box 66 \ 3 scan0179 | |
| The standardisation of 40/50 HP Bonnet Shutters. | 7th Jul 1927 | Box 66 \ 3 scan0180 | |
| Deleting back bonnet shutters and proposing a less expensive scheme. | 9th Jul 1927 | Box 66 \ 3 scan0181 | |
| Proposal for the standardisation of bonnets without shutters. | 11th May 1927 | Box 66 \ 3 scan0182 | |
| Introduction of a new part to a chassis, including test date and costs. | 27th Sep 1927 | Box 66 \ 3 scan0183 | |
| Instruction memo regarding modifications for the 10-EX car, requesting the production of a plain bonnet and a skeleton undershield. | 16th Jul 1927 | Box 66 \ 3 scan0184 | |
| Specifying the design for the 10-EX bonnet to have plain side panels without shutters. | 13th Jul 1928 | Box 66 \ 3 scan0185 | |
| Instruction for the new bonnet for 10-EX to have plain side panels with no shutters. | 18th Jul 1928 | Box 66 \ 3 scan0186 | |
| Confirming decisions on the design of 40/50 HP bonnets regarding shutters and louvres. | 22th Jul 1927 | Box 66 \ 3 scan0187 | |
| Policy on using louvred bonnets versus bonnet shutters, considering cost reduction and effectiveness in tropical climates. | 11th Aug 1927 | Box 66 \ 3 scan0188 | |
| Enquiry into the cost of a 40/50 HO Louvred Bonnet, concluding it is cheaper than the Standard Shuttered Bonnet. | 18th Aug 1927 | Box 66 \ 3 scan0189 | |
| Modifications to the Phantom bonnet catch and an enquiry into a missing polished strip on a 20 HP car. | 10th Sep 1927 | Box 66 \ 3 scan0190 | |
| Use of louvred bonnets versus shutters, referencing the 'Phantom' model. | 17th Sep 1927 | Box 66 \ 3 scan0191 | |
| From BJ to Hs requesting to test a car with an improved design of bonnet shutters to assess engine noise. | 9th Sep 1927 | Box 66 \ 3 scan0192 | |
| Arranging a car to compare a louvered bonnet with a closed bonnet. | 20th Sep 1927 | Box 66 \ 3 scan0193 | |
| Use of bonnet louvres versus shutters, considering their impact on engine noise and the brand's reputation for silence. | 22th Sep 1927 | Box 66 \ 3 scan0194 | |
| Issue of mud entering louvred bonnets. | 12th Nov 1928 | Box 66 \ 3 scan0195 | |
| Decision to discontinue bonnet louvres and expressing apprehension about the consequences. | 26th Sep 1927 | Box 66 \ 3 scan0196 | |
| Objections to louvered bonnets and a proposed asbestos mat solution. | 28th Sep 1928 | Box 66 \ 3 scan0197 | |
| Design and development of a shorter starting handle. | 22th Dec 1925 | Box 66 \ 3 scan0198 | |
| Storage position for the starting handle and Mr. Royce's opinion on the matter. | 23th Dec 1925 | Box 66 \ 3 scan0199 | |
| Storage location of the Phantom starting handle. | 29th Dec 1925 | Box 66 \ 3 scan0200 | |
| Customer feedback on the 'New Phantom' starting handle and suggestions for redesign. | 12th Jan 1926 | Box 66 \ 3 scan0201 | |
| Optimal position for storing the 'Phantom' starting handle. | 19th Jan 1926 | Box 66 \ 3 scan0202 | |
| Forwarding a letter and blueprint regarding the RRAI starting handle for comments. | 17th May 1929 | Box 66 \ 3 scan0203 | |
| Letter from Rolls Royce of America proposing a simplification of the starting handle to reduce weight and cost. | 7th May 1929 | Box 66 \ 3 scan0204 | |
| Query regarding the design of the EAC engine and its difficulty starting in cold climates compared to the 40/50 model. | 18th Dec 1924 | Box 66 \ 3 scan0205 | |
| Secret memo comparing the EAC car's cold weather performance to the 40/50 HP model and noting ongoing improvements. | 19th Dec 1924 | Box 66 \ 3 scan0206 | |
| Carburetter and ignition plug issues for the New Phantom model. | 30th Jun 1925 | Box 66 \ 3 scan0207 | |
| Explaining an oversight in sending a drawing of modifications to the shutter and starting carburetter control. | 6th Jul 1925 | Box 66 \ 3 scan0208 | |
| Technical memo discussing a modification to prevent a part from being tampered with or accidentally moved. | 14th Oct 1926 | Box 66 \ 3 scan0209 | |
| Modifications to the new starting carburetter design for the Phantom Engine. | 14th Oct 1926 | Box 66 \ 3 scan0210 | |
| Reverting to the standard starting carburetter for the 40/50HP Chassis due to testing difficulties. | 31th Dec 1926 | Box 66 \ 3 scan0211 | |
| Sending blueprints for new parts for a Phantom Starting Carburetter, for testing a new lock for the adjusting screw. | 13th Jan 1927 | Box 66 \ 3 scan0212 | |
| Results of testing increased friction on a Phantom starting carburetter needle. | 2nd Feb 1927 | Box 66 \ 3 scan0213 | |
| Letter discussing cold knocking issues in Phantom engines and potential solutions. | 6th Dec 1927 | Box 66 \ 3 scan0214 | |
| Proposal for testing a water cooling scheme for valves and exhaust outlets to improve engine performance and reduce detonation. | 12th Jun 1927 | Box 66 \ 3 scan0215 | |
| Proposal for modifying the water supply direct to the cylinder head. | 12th Jun 1927 | Box 66 \ 3 scan0216 | |
| Letter from the Springfield office to Derby regarding pilot jet adjustments and testing for the Phantom engine. | 23th Dec 1927 | Box 66 \ 3 scan0217 | |
| Letter discussing a scheme to prevent cold knocks and standardizing an extra oil valve for U.S. engines. | 21th Dec 1927 | Box 66 \ 3 scan0218 | |
| Blueprint of a simplified extra oil banjo for connecting a pilot jet and intake manifold. | 21th Dec 1927 | Box 66 \ 3 scan0219 | |
| Sketch detailing an attempt at improving a pilot jet assembly. | 21th Dec 1927 | Box 66 \ 3 scan0220 | |
| Blueprint of an oil system component featuring a pilot jet. | 21th Dec 1927 | Box 66 \ 3 scan0221 | |
| Error in setting the starting carburetter pilot jet. | 27th Dec 1927 | Box 66 \ 3 scan0222 | |
| Notification regarding the carburetter setting for the Springfield Phantom. | 27th Dec 1927 | Box 66 \ 3 scan0223 | |
| Graph comparing pilot jet area and opening against needle turns for various jet configurations. | 27th Dec 1927 | Box 66 \ 3 scan0224 | |
| Letter detailing experimental results for a starting carburetter. | 28th Dec 1927 | Box 66 \ 3 scan0225 | |
| Letter discussing schemes for extra oil lubrication and carburetion control for Phantom engines to reduce smoke. | 24th Jun 1929 | Box 66 \ 3 scan0226 | |
| Whether to issue a pamphlet or attach labels to the chassis regarding starter carburetter over-use and piston seizures. | 24th Jun 1929 | Box 66 \ 3 scan0227 | |
| Clarifying instruction manual warnings regarding the over-use of the starter carburetter to prevent piston seizures. | 24th Jun 1929 | Box 66 \ 3 scan0228 | |
| The starter carburetter's lack of fool-proof design and the proposal for a warning leaflet. | 1st Jul 1929 | Box 66 \ 3 scan0229 | |
| Accompanying a revised draft leaflet concerning the over-use of the starter carburetter and resulting piston seizures. | 1st Jul 1929 | Box 66 \ 3 scan0230 | |
| Client's suggestion to add a warning light for the starter carburetter on 20 HP and Phantom I chassis. | 8th Nov 1929 | Box 66 \ 3 scan0231 | |
| Letter discussing the attachment of a warning light for the starter carburetter on 20 HP & Phantom I chassis. | 11th Nov 1929 | Box 66 \ 3 scan0232 | |
| Proposal to add a red warning lamp to indicate when the starting carburetter is in operation. | 18th Nov 1929 | Box 66 \ 3 scan0233 | |
| The production and testing of an undershield for the gearbox section of a chassis. | 1st Apr 1919 | Box 66 \ 3 scan0234 | |
| Supply and fitting of undershields, instrument boards, and gauges. | 14th May 1919 | Box 66 \ 3 scan0235 | |
| Extract detailing the assembly of chassis 1 E.X. and its undershield. | 30th Jun 1919 | Box 66 \ 3 scan0236 | |
| Extract listing new parts fitted to the 40/50 chassis, specifically a new undershield for the starter motor. | 27th Aug 1919 | Box 66 \ 3 scan0237 | |
| Responding to a recommendation about reducing dynamo and drive noise. | 22th May 1919 | Box 66 \ 3 scan0238 | |
| Chassis 'booms' and noise issues related to the undershield, proposing increased clearance and an investigation. | 15th Nov 1919 | Box 66 \ 3 scan0239 | |
| The recurring failure and associated costs of undershields on test cars due to burnt-out cut-out pockets. | 6th Mar 1920 | Box 66 \ 3 scan0240 | |
| Chassis with unlouvred side engine guards and the potential for overheating in Spain. | 15th Mar 1920 | Box 66 \ 3 scan0241 | |
| The ongoing issue of faulty front engine guards breaking during testing and a suggestion for a solution. | 15th Mar 1920 | Box 66 \ 3 scan0242 | |
| Instructions regarding the supply of standard louvered and spare unlouvered engine guards for chassis 65-CW. | 16th Mar 1920 | Box 66 \ 3 scan0243 | |
| Improving undershields by adding more stiffening ribs. | 8th Apr 1920 | Box 66 \ 3 scan0244 | |
| Questioning the necessity and effectiveness of louvred engine undershields on specific chassis. | 27th Jul 1920 | Box 66 \ 3 scan0245 | |
| The test results of a steel patch fitted to an undershield on a test car. | 10th Aug 1920 | Box 66 \ 3 scan0246 | |
| Replacing louvered undershields with unlouvered ones for several chassis, and the associated costs for the client. | 14th Aug 1920 | Box 66 \ 3 scan0247 | |
| Modification to the RE 40/50 chassis undershields by fitting an aluminium strip. | 9th Oct 1920 | Box 66 \ 3 scan0248 | |
| Agreeing to a modification for the 40/50 Chassis Gear Box Undershield. | 18th Dec 1920 | Box 66 \ 3 scan0249 | |
| Listing blueprints for gearbox undersheet components for a 40/50 chassis. | 1st Jan 1922 | Box 66 \ 3 scan0250 | |
| Requesting blueprints for an experimental gearbox undersheet modification on a 40/50 chassis. | 9th Oct 1922 | Box 66 \ 3 scan0251 | |
| Disapproving of the undershield design for the 6.EX car and proposing a modification. | 19th Apr 1923 | Box 66 \ 3 scan0252 | |
| Rare but persistent customer fault concerning grit getting wedged in the brake drum. | 1st Jun 1923 | Box 66 \ 3 scan0253 | |
| Proposal to modify car drums and shields to be similar to the 20 HP model. | 22th Jun 1923 | Box 66 \ 3 scan0254 | |
| From Mr. Olley to Mr. Hives discussing modifications to reduce the car's undersheeting. | 22th Jun 1923 | Box 66 \ 3 scan0255 | |
| Design and modifications for the engine and gearbox undershield, referencing several drawings. | 7th Jul 1924 | Box 66 \ 3 scan0256 | |
| Typed memorandum discussing ideas to improve cooling for the 40/50 model, including airflow and water pump design. | 18th Jul 1924 | Box 66 \ 3 scan0257 | |
| Confirming the dispatch of drawings for an open-type undershield to improve under-bonnet engine cooling. | 18th Jul 1924 | Box 66 \ 3 scan0258 | |
| Modifications to the engine undershield and cross steering tube for improved clearance. | 3rd Nov 1924 | Box 66 \ 3 scan0259 | |
| Confirming an undershield modification is being sent from West Wittering for EAC.II. | 19th Dec 1924 | Box 66 \ 3 scan0260 | |
| Design of undershields for 'V' & 'W' series chassis, referencing specific drawings and design challenges. | 8th Jan 1925 | Box 66 \ 3 scan0261 | |
| Current 'V' Series undershield and the development of a replacement. | 25th Feb 1925 | Box 66 \ 3 scan0262 | |
| Secret internal memo about an issue with 'V' series underguards and undershields. | 28th Feb 1925 | Box 66 \ 3 scan0263 | |
| Secret memo regarding the placement of the starter motor to remove a limit on the gearbox. | 20th Apr 1925 | Box 66 \ 3 scan0264 | |
| Secret memo regarding a proposal to lengthen an undershield based on a 10,000-mile test report. | 4th May 1925 | Box 66 \ 3 scan0265 | |
| Mr. Royce's wish to increase the number of louvres on engine underguards. | 1st May 1925 | Box 66 \ 3 scan0266 | |
| Modification to under-guards using soft felt strips to fill space around the crankcase. | 1st Jul 1925 | Box 66 \ 3 scan0267 | |
| Alterations to drawings for an undersheet fouling a steering tube and ordering new selector springs. | 23th Jul 1925 | Box 66 \ 3 scan0268 | |
| Adding a drain hole to the 40/50HP 'V' series chassis undershields and discussing radiator overflow pipes. | 17th Aug 1925 | Box 66 \ 3 scan0269 | |
| Fitting the gearbox undershield to the bottom half crankcase for the New Phantom Engine. | 17th Feb 1926 | Box 66 \ 3 scan0270 | |
| Complaint that undershields are lower than necessary and recommending a new ground clearance test. | 14th Jun 1926 | Box 66 \ 3 scan0271 | |
| Undershield ground clearance. | 15th Jun 1926 | Box 66 \ 3 scan0272 | |
| Experimental undershield for the Phantom Car C.2. Series and pushing it forward to production. | 3rd Sep 1926 | Box 66 \ 3 scan0273 | |
| Undershield and valance modifications for the 10-EX Sports Phantom car. | 19th Dec 1927 | Box 66 \ 3 scan0274 | |
| Suitability of Phantom engine guards and requesting more data on road conditions. | 15th Nov 1928 | Box 66 \ 3 scan0275 | |
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