| Description | Date | Identifier | |
| Requesting an order of six superior fan and dynamo belts for testing on experimental cars. | 18th Mar 1924 | Box 55 \ 2 Scan154 | |
| Despatch of two special fan belts for experimental cars to Mr. Robotham in France. | 27th Mar 1924 | Box 55 \ 2 Scan155 | |
| Letter regarding the dispatch and testing of two special Fan Belts in France. | 27th Mar 1924 | Box 55 \ 2 Scan156 | |
| Return of a faulty Maximaire fan belt that had split after 2,000 miles. | 29th Mar 1924 | Box 55 \ 2 Scan157 | |
| Urgent internal memo regarding the decision to reorder Whittle fan drive belts or adopt a new standard for the U series. | 7th Apr 1924 | Box 55 \ 2 Scan158 | |
| Reliability of a 'Brammer' fan belt compared to a 'Whittle' belt after testing. | 10th Apr 1924 | Box 55 \ 2 Scan159 | |
| The testing of a Brammer Patent Fan Belt. | 10th Apr 1924 | Box 55 \ 2 Scan160 | |
| Test report on a 3-ply leather Ormerod fan belt for a 20 HP car, which failed due to being too pliable. | 2nd May 1924 | Box 55 \ 2 Scan161 | |
| Failure of Brammer belts, relaying the manufacturer's opinion that incorrect dressing was applied. | 2nd May 1924 | Box 55 \ 2 Scan162 | |
| Testing of a special type of fan belt. | 19th Jun 1923 | Box 55 \ 2 Scan163 | |
| Recommending the immediate testing of special American fan and dynamo belts to resolve a noise issue on 40/50 HP cars. | 11th Jul 1924 | Box 55 \ 2 Scan164 | |
| Expressing caution about changing fan and dynamo belts, referencing a previous costly mistake. | 14th Jul 1924 | Box 55 \ 2 Scan165 | |
| Letter from a supplier, H. Brammer & Co. Ltd, addressing a complaint about their endless non-slip belting. | 15th Aug 1924 | Box 55 \ 2 Scan166 | |
| Failure of Delco Remy fan belts after testing. | 8th Aug 1924 | Box 55 \ 2 Scan167 | |
| The performance of a 3-piece 'Brammer' type fan and dynamo belt after road testing. | 13th Sep 1924 | Box 55 \ 2 Scan168 | |
| The ordering, standardisation, and service testing of 'Brammer' fan belts. | 9th Sep 1924 | Box 55 \ 2 Scan169 | |
| Request for a sample of a Brammer fan belt for Mr. Royce's review before standardisation. | 8th Oct 1924 | Box 55 \ 2 Scan170 | |
| Instructing the stores to despatch a Brammer Fan Belt to Mr. Elliott at West Wittering for examination. | 13th Oct 1924 | Box 55 \ 2 Scan171 | |
| Complaint about Brammer Fan Belts and the supplier's response. | 12th Nov 1924 | Box 55 \ 2 Scan172 | |
| Letter from a supplier discussing the properties of Semi Raw Hide versus Chrome Tanned leather for V-belts. | 10th Nov 1924 | Box 55 \ 2 Scan173 | |
| Receiving and ordering experimental Brammer belts made from different leathers. | 14th Nov 1924 | Box 55 \ 2 Scan174 | |
| Internal memorandum concerning Brammer Fan Belts, enclosing a copy of a letter. | 14th Nov 1924 | Box 55 \ 2 Scan175 | |
| Letter from H. Brammer & Co. Ltd. confirming the dispatch of leather belts for testing. | 13th Nov 1924 | Box 55 \ 2 Scan176 | |
| Trial belt from a supplier and requesting modifications for adjustability. | 10th Aug 1925 | Box 55 \ 2 Scan177 | |
| Covering note for an attached letter and drawing from Delco-Remy & Hyatt Ltd regarding a Maximair Belt. | 11th Feb 1927 | Box 55 \ 2 Scan178 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding dimensions for Maximaire Fan Belts. | 10th Feb 1927 | Box 55 \ 2 Scan179 | |
| Request for the return of a drawing for a 'MAXIMAIRE FAN BELT' to reply to Messrs. Delco-Remy & Hyatt. | 2nd Mar 1927 | Box 55 \ 2 Scan180 | |
| Sample 'Lotus' Belt, a steel chain with rubber bearing plates. | 11th Jun 1927 | Box 55 \ 2 Scan181 | |
| Promotional leaflet for 'Lotus' Fan & Dynamo Belting, a steel chain with rubber side plates. | 11th Jun 1927 | Box 55 \ 2 Scan182 | |
| Promotional leaflet for Lotus Fan & Dynamo Transmission Belts, detailing features, sizes, and prices. | 8th Sep 1924 | Box 55 \ 2 Scan183 | |
| Technical drawing of a V-belt pulley with minimum and maximum center-to-center dimensions. | 8th Sep 1924 | Box 55 \ 2 Scan184 | |
| Request to obtain three samples of a British Goodrich rubber fan belt for testing on a 40/50 HP car. | 2nd Jan 1930 | Box 55 \ 2 Scan185 | |
| Sample of a Goodrich Rubber Fan Belt, its properties, specifications, and use by other car manufacturers. | 31th Dec 1929 | Box 55 \ 2 Scan186 | |
| Letter from British Goodrich Rubber Co. Ltd. regarding the supply and specifications of Longlife 'V' Type Fan Belts. | 26th Sep 1929 | Box 55 \ 2 Scan187 | |
| Letter from B.G.R. Co., Ltd. promoting the British Goodrich Longlife 'V' Type Fan Belt. | 26th Sep 1929 | Box 55 \ 2 Scan188 | |
| Letter from British Goodrich Rubber Co. Ltd. regarding the performance of a belt and its suitability as original equipment. | 26th Sep 1929 | Box 55 \ 2 Scan189 | |
| Sample fan belts from the Lycett 'Rawido' Belting Co. and a request for feedback. | 17th Jul 1930 | Box 55 \ 2 Scan190 | |
| Letter from Lycett Saddle & Motor Accessories Co. Ltd. regarding sample Fan Belts. | 16th Jul 1930 | Box 55 \ 2 Scan191 | |
| Query regarding payment for an invoice for two sample fan belts received from the Lycett 'Rawido' Belting Co. | 18th Jun 1930 | Box 55 \ 2 Scan192 | |
| Request to order six British Goodrich endless fan belts. | 8th Jul 1930 | Box 55 \ 2 Scan193 | |
| The unsuitability of Lycett fan belts due to noise and slippage, recommending British Goodrich belts instead. | 23th Jul 1930 | Box 55 \ 2 Scan194 | |
| Letter to Mr. R.W.H. Bailey discussing the trial and performance of a Dayton endless rubber fan belt on Phantom models. | 9th Aug 1929 | Box 55 \ 2 Scan195 | |
| The closing page of a letter from Rolls Royce of America, Inc., signed by Maurice Olley. | 13th Aug 1930 | Box 55 \ 2 Scan196 | |
| Improving the 40/50 fan's cooling efficiency by increasing its speed with a double pulley drive to address overheating complaints. | 13th Aug 1930 | Box 55 \ 2 Scan197 | |
| Query about the production schedule for a new type of canvas rubber fan belt. | 1st Aug 1930 | Box 55 \ 2 Scan198 | |
| Overheating issues and proposed modifications for the Phantom II model. | 4th Sep 1930 | Box 55 \ 2 Scan199 | |
| Ongoing tests for overheating on the Phantom II, specifically investigating modifications to the undershields. | 8th Sep 1930 | Box 55 \ 2 Scan200 | |
| Recommended testing procedure for canvas rubber fan belts to prevent overloading. | 12th Sep 1930 | Box 55 \ 2 Scan201 | |
| Fan belt measurements for a left-hand drive chassis. | 15th Sep 1930 | Box 55 \ 2 Scan202 | |
| Standardisation of a Goodrich endless canvas rubber fan belt to improve cooling system efficiency. | 11th Jul 1930 | Box 55 \ 2 Scan203 | |
| Urgent request for half a dozen Goodrich type fan belts for the 20/25 HP model. | 13th Nov 1930 | Box 55 \ 2 Scan204 | |
| On an issue with the rubber fan belt wearing through an oil pipe on a 25 HP engine, and the implemented solution. | 3rd Dec 1930 | Box 55 \ 2 Scan205 | |
| Quarterly complaint report about rubber fan belts being too long and stretching excessively. | 15th Dec 1930 | Box 55 \ 2 Scan206 | |
| Standardisation of a Dunlop Rubber Fan Belt for the 25 HP Chassis. | 14th Jan 1931 | Box 55 \ 2 Scan207 | |
| Standardisation form for part SS20 on a 20/25 HP chassis. | 17th Mar 1931 | Box 55 \ 2 Scan208 | |
| Issues and potential improvements for 20/25 HP fan belts. | 22th Sep 1931 | Box 55 \ 2 Scan209 | |
| The testing of Dunlop fan belts for the 20/25 HP model. | 23th Sep 1931 | Box 55 \ 2 Scan210 | |
| Querying an invoice from Thomson & Taylor (Brooklands) Ltd. for Whittle Belting for which no order can be found. | 11th Jul 1932 | Box 55 \ 2 Scan211 | |
| Purchase of a fan belt from Thomson & Taylor during car tests at Brooklands. | 13th Jul 1932 | Box 55 \ 2 Scan212 | |
| Request for instructions to alter a car's springing by fitting flexible inverted springs and old oil shock absorbers. | 26th Oct 1911 | Box 55 \ 3 Scan001 | |
| Meeting notes on adapting old hydraulic shock absorbers with a long lever for testing with flexible springs. | 15th Nov 1911 | Box 55 \ 3 Scan002 | |
| Minutes from a meeting discussing a design issue with a longer lever for hydraulic shock absorbers. | 4th Dec 1911 | Box 55 \ 3 Scan003 | |
| Meeting minute discussing new springing, casting delivery, and problems designing compatible hydraulic shock absorbers. | 8th Dec 1911 | Box 55 \ 3 Scan004 | |
| Index card detailing a modification to hydraulic shock absorbers, specifically altering the connecting links. | 4th Sep 1912 | Box 55 \ 3 Scan005 | |
| Job card for the supply and fitting of hydraulic shock absorbers. | 11th Sep 1912 | Box 55 \ 3 Scan006 | |
| Record card for a Hydraulic Shock Absorber, including supply and testing information. | 19th Dec 1912 | Box 55 \ 3 Scan007 | |
| Confirming the delivery of hydraulic shock absorbers to the Experimental Department for testing. | 21th Nov 1912 | Box 55 \ 3 Scan008 | |
| Outlining a series of proposed tests for shock dampers, back axle strength, and chassis lateral movement. | 12th Feb 1913 | Box 55 \ 3 Scan009 | |
| Testing of hydraulically checked shock absorbers. | 25th Feb 1913 | Box 55 \ 3 Scan010 | |
| Follow-up memo to Mr. Hives regarding an unanswered query from Mr. Royce about a shock absorber experiment. | 12th Apr 1913 | Box 55 \ 3 Scan011 | |
| Chasing progress on a delayed shock absorber experiment at the request of Mr Royce. | 29th Apr 1913 | Box 55 \ 3 Scan012 | |
| Departmental memo concerning a delay and incorrect fitment of hydraulically checked shock absorbers. | 14th May 1913 | Box 55 \ 3 Scan013 | |
| Response to Mr Royce regarding shock absorbers that were incorrectly keyed and returned to the works for alteration. | 15th May 1913 | Box 55 \ 3 Scan014 | |
| From F.H.R. discussing the development of hydraulic versus friction shock dampers. | 12th Jul 1913 | Box 55 \ 3 Scan015 | |
| Experimental Department 'A' weekly report on piston distortion, benzol tests, and shock absorbers. | 24th Jul 1913 | Box 55 \ 3 Scan016 | |
| The ride comfort of a light car, specifically addressing axle jumping over potholes and the effects of shock absorbers. | 6th Feb 1914 | Box 55 \ 3 Scan017 | |
| Instruction sheet for modifications to hydraulic shock absorber levers on chassis 2704. | 6th Feb 1914 | Box 55 \ 3 Scan018 | |
| Note on the fitting of rear hydraulic shock absorbers, detailing an installation issue due to a body building mistake. | 18th Mar 1914 | Box 55 \ 3 Scan019 | |
| Standardisation of hydraulic shock absorbers for the rear of the car. | 18th Mar 1914 | Box 55 \ 3 Scan020 | |
| Modifications to shock absorbers concerning the oil filling hole and piston oil flow. | 18th Mar 1914 | Box 55 \ 3 Scan021 | |
| Letter seeking clarification on different types of hydraulic shock absorbers and their associated part numbers for various chassis. | 23th Apr 1914 | Box 55 \ 3 Scan022 | |
| Clarifying which type of hydraulic shock absorber to use on model 58NA. | 1st May 1914 | Box 55 \ 3 Scan023 | |
| Instruction from Mr. Royce to cease production of hydraulic shock absorbers because they fail to retain oil. | 16th Jan 1914 | Box 55 \ 3 Scan024 | |
| Confirming the cancellation of an experiment on hydraulic shock absorbers. | 18th May 1914 | Box 55 \ 3 Scan025 | |
| Setup and testing of various shock dampers for Phantom and 20 HP models. | 23th Sep 1925 | Box 55 \ 3 Scan026 | |
| Original hydraulic shock damper, with a handwritten reply confirming it has been sent. | 3rd Oct 1925 | Box 55 \ 3 Scan027 | |
| Confirming the dispatch of one hydraulic shock damper. | 7th Oct 1925 | Box 55 \ 3 Scan028 | |
| The performance testing of 'Lovejoy' hydraulic shock absorbers. | 12th Jun 1925 | Box 55 \ 3 Scan029 | |
| Running experience of Phantom and India cars, potential chassis weight reduction, and hydraulic shock absorber design. | 27th Oct 1925 | Box 55 \ 3 Scan030 | |
| Proposed new hydraulic shock dampers for the Phantom model. | 7th Nov 1925 | Box 55 \ 3 Scan031 | |
| The mounting instructions and specifications for a 40/50 hydraulic shock absorber. | 13th Nov 1925 | Box 55 \ 3 Scan032 | |
| Bump test of hydraulic shock absorbers, which failed due to distorted aluminium back plates. | 25th Nov 1925 | Box 55 \ 3 Scan033 | |
| Cross-sectional diagram from a hydraulic shock damper endurance test, noting back plate distortion and a slight oil leak. | 25th Nov 1924 | Box 55 \ 3 Scan034 | |
| New Phantom front axle design to address steering wobbles. | 16th Nov 1925 | Box 55 \ 3 Scan035 | |
| Particulars and unique design features of a hydraulic shock damper. | 20th Nov 1925 | Box 55 \ 3 Scan036 | |
| Modifications to a hydraulic shock absorber to prevent air locks when filling with oil. | 4th Feb 1926 | Box 55 \ 3 Scan037 | |
| The completion and testing of the first set of piston-type hydraulic shock absorbers, noting difficulties with trapped air. | 2nd Feb 1926 | Box 55 \ 3 Scan038 | |
| Preliminary tests of hydraulic shock absorbers, detailing high-frequency chatter caused by trapped air. | 2nd Feb 1926 | Box 55 \ 3 Scan039 | |
| Issues with a shock absorber design, detailing air re-entry problems and current loading specifications. | 23th Jan 1926 | Box 55 \ 3 Scan040 | |
| Request to test piston-type hydraulic shock absorbers. | 23th Jan 1926 | Box 55 \ 3 Scan041 | |
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