| Description | Date | Identifier | |
| Report comparing the safety performance of Stanwell, Goodyear, and Firestone tyre rims when driving with a deflated tyre. | 19th May 1920 | Box 78 \ 2 scan0019 | |
| Merits of Goodyear rims over Firestone and the plan to standardize them for both English and American chassis. | 19th May 1920 | Box 78 \ 2 scan0020 | |
| Anti-theft measures and an analysis of different wheel types and their popularity. | 2nd Dec 1919 | Box 78 \ 2 scan0021 | |
| Cover note attaching a copy of a letter from America referenced NHM-4018. | 5th Aug 1920 | Box 78 \ 2 scan0022 | |
| Letter from Rolls-Royce of America regarding the supply of American Michelin Disc Wheels and Disteel Wheels. | 22th Jul 1920 | Box 78 \ 2 scan0023 | |
| Letter from Rolls-Royce America to the UK regarding the order and specifications of Disteel wheels and hubs. | 16th Aug 1920 | Box 78 \ 2 scan0024 | |
| Letter from Rolls-Royce of America regarding an order for a set of 6 Disteel Wheels and the details of the hubs. | 23th Aug 1920 | Box 78 \ 2 scan0025 | |
| Shipment status of Disteel wheels and the inspection of Michelin wheels. | 6th Oct 1920 | Box 78 \ 2 scan0026 | |
| The American Budd Wheel from Philadelphia, P.A., U.S.A. | 1st Apr 1921 | Box 78 \ 2 scan0027 | |
| Assessment report on the design and production suitability of the Disteel Wheel. | 1st Apr 1921 | Box 78 \ 2 scan0028 | |
| Request for a report in triplicate regarding Michelin & Disteel Wheels, following a letter from America. | 24th Mar 1921 | Box 78 \ 2 scan0029 | |
| Letter from the American branch regarding customer inquiries and concerns about untested Michelin (Budd) and Disteel wheels. | 4th Mar 1921 | Box 78 \ 2 scan0030 | |
| Comparing American Budd and Disteel wheels with standard Michelin disc wheels. | 1st Apr 1921 | Box 78 \ 2 scan0031 | |
| On the performance of Michelin Budd wheels, detailing issues with noise, buckling, and steering in crosswinds. | 29th Sep 1921 | Box 78 \ 2 scan0032 | |
| Design, materials, and operation of the lever and gate for the Goshawk III 4-speed gearbox. | 1st Sep 1924 | Box 78 \ 2 scan0033 | |
| Continuation page of a document discussing whether aluminium bronze can be soldered. | 27th May 1925 | Box 78 \ 2 scan0034 | |
| Responding to a query about the comparability of braking units and servo diagrams. | 27th May 1925 | Box 78 \ 2 scan0035 | |
| Page 2 of an experimental report detailing corrections to servo efficiency figures and presenting new data from a more efficient servo. | 7th May 1925 | Box 78 \ 2 scan0036 | |
| Servo braking efficiency and distribution for the 'India' unit. | 27th May 1925 | Box 78 \ 2 scan0037 | |
| Correcting an assumption about braking units and pedal pressure in relation to car weight. | 27th May 1925 | Box 78 \ 2 scan0038 | |
| The servo efficiency of front wheel brakes for the 'India' model. | 25th Sep 1924 | Box 78 \ 2 scan0039 | |
| Modifications to the brake system leverage and distribution. | 25th Sep 1924 | Box 78 \ 2 scan0040 | |
| On the specifications of the 'India' servo, with a request to fit these parts to two other cars for testing. | 14th Jul 1925 | Box 78 \ 2 scan0041 | |
| Departmental memo with a diagram illustrating a test rig for a car's spring shackle. | 1st Jun 1910 | Box 78 \ 2 scan0042 | |
| Instruction sheet with handwritten notes on component weights and a dimensional sketch of a bracket. | 2nd Oct 1910 | Box 78 \ 2 scan0043 | |
| Instruction sheet with weight calculations for a spring clip list. | 3rd Oct 1910 | Box 78 \ 2 scan0044 | |
| Test results for rear front spring links showing deflection under various weights. | 15th Dec 1910 | Box 78 \ 2 scan0045 | |
| Requesting a drawing alteration to increase clearance between the front spring shackle and the engine side guard. | 13th Sep 1911 | Box 78 \ 2 scan0046 | |
| Meeting minute discussing the use of bronze or white metal instead of fibre for bushes in road springs and shackles. | 17th Jan 1912 | Box 78 \ 2 scan0047 | |
| Decision to fit Indian and Colonial cars with bronze bushes. | 5th Feb 1912 | Box 78 \ 2 scan0048 | |
| Rear springing issue where a spring clip fouls a bolt, and a proposed solution from Mr Royce. | 5th Feb 1912 | Box 78 \ 2 scan0049 | |
| Letter from the Paris Depot about a cracked double spring link and seizing bolts in fibre bushes. | 7th May 1912 | Box 78 \ 2 scan0050 | |
| Departmental memo concerning a broken spring link on chassis 1711 for Mortimer Singer. | 8th May 1912 | Box 78 \ 2 scan0051 | |
| Lord Northcliffe's car, which has broken down in Gravesend with a broken spring shackle. | 8th May 1912 | Box 78 \ 2 scan0052 | |
| Departmental memo regarding a potentially faulty rear spring bracket that has fractured on two vehicles, questioning if it has been strengthened and should be replaced on all cars. | 10th May 1912 | Box 78 \ 2 scan0053 | |
| Departmental memo regarding a broken near side double spring link from chassis 1758, for examination and a decision on free replacement. | 13th May 1912 | Box 78 \ 2 scan0054 | |
| To Mr. Cowne regarding a broken double shackle link on Lord Northcliffe's car, chassis 1758. | 13th May 1912 | Box 78 \ 2 scan0055 | |
| Failure of Lord Northcliffe's car due to a broken spring shackle and the subsequent inquiry. | 16th May 1912 | Box 78 \ 2 scan0056 | |
| Departmental memo requesting further details on a report about a double spring link. | 17th May 1912 | Box 78 \ 2 scan0057 | |
| Departmental memo to Mr. Barrington regarding a broken spring link on Mortimer Singer's car, chassis 1711. | 22th May 1912 | Box 78 \ 2 scan0058 | |
| Departmental memo regarding sending a broken double spring link with associated papers. | 22th May 1912 | Box 78 \ 2 scan0059 | |
| Requesting that all correspondence regarding Lord Northcliffe be sent to Mr. Barrington for a decision. | 22th May 1912 | Box 78 \ 2 scan0060 | |
| Departmental memo attaching correspondence concerning a spring shackle for Lord Northcliffe's car (1758). | 23th May 1912 | Box 78 \ 2 scan0061 | |
| Report on the breaking of spring brackets on several cars. | 29th May 1912 | Box 78 \ 2 scan0062 | |
| Departmental memo regarding the failure of a rear spring bracket on Mortimer-Singer's and Duveen's chassis. | 29th May 1912 | Box 78 \ 2 scan0063 | |
| Experiments into component failures, considering changing fibre bushes to bronze and increasing spring shackle clearance. | 16th Apr 1912 | Box 78 \ 2 scan0064 | |
| Experimental rear spring link. Test to destruction. | 29th May 1912 | Box 78 \ 2 scan0065 | |
| Instructions for a stress test on a front shackle of rear springs to understand failure points. | 29th May 1912 | Box 78 \ 2 scan0066 | |
| Twisting test conducted on a broken front link of a rear spring. | 7th Jun 1912 | Box 78 \ 2 scan0067 | |
| Page 2 of a report detailing a bending test on a link, noting twisting, fracture, and test setup difficulties. | 7th Jun 1912 | Box 78 \ 2 scan0068 | |
| Method and result of a stress test on a mechanical link, which fractured after 10 reversals. | 7th Jun 1912 | Box 78 \ 2 scan0069 | |
| Analysis of stress tests on a link, comparing twisting and bending forces as the cause of fractures. | 7th Jun 1912 | Box 78 \ 2 scan0070 | |
| Analysis of material failures, comparing fractures from high-stress bench tests to those occurring from repeated low-stress on the road. | 7th Jun 1912 | Box 78 \ 2 scan0071 | |
| Concluding statement on neat and clean fractures which occurred on the road. | 7th Jun 1912 | Box 78 \ 2 scan0072 | |
| Departmental memo to Mr Wormald chasing a report on a broken spring link. | 7th Jun 1912 | Box 78 \ 2 scan0073 | |
| The investigation into the failure of rear spring links on chassis 1758 (Northcliffe). | 10th Jun 1912 | Box 78 \ 2 scan0074 | |
| Confirming Mr. Royce's decision on the material composition and clearance for road-spring bushes. | 10th Jun 1912 | Box 78 \ 2 scan0075 | |
| Clearance specifications in spring shackles for various spring types. | 26th Jun 1912 | Box 78 \ 2 scan0076 | |
| Test report on spring shackle clearance to address a knocking issue. | 3rd Apr 1912 | Box 78 \ 2 scan0077 | |
| Short typed note regarding a slack pin and end play, with a handwritten memo about its distribution. | 3rd Apr 1912 | Box 78 \ 2 scan0078 | |
| Reminder to order enamelled iron instruction plates regarding clearance in road spring bushes for the Repair Shop. | 12th Jun 1912 | Box 78 \ 2 scan0079 | |
| Departmental memorandum regarding testing and recommendations for spring shackle clearance. | 3rd Jul 1912 | Box 78 \ 2 scan0080 | |
| Examination of Lord Northcliffe's car's spring links and spring eyes. | 17th Jul 1912 | Box 78 \ 2 scan0081 | |
| Departmental memo concerning failures and clearance issues in spring link bushes on over 300 cars. | 31th Aug 1912 | Box 78 \ 2 scan0082 | |
| Departmental memo discussing the cost of changing bushes and a report of a broken rear spring link. | 9th Sep 1911 | Box 78 \ 2 scan0083 | |
| Memo outlining a plan to arrange a part replacement for customers via agents, including logistical and training requirements. | 6th Sep 1912 | Box 78 \ 2 scan0084 | |
| To Mr. Royce about a recurring failure of a rear spring link on Chassis 1711. | 31th Aug 1912 | Box 78 \ 2 scan0085 | |
| Types of bushes fitted to various chassis ranges. | 11th Mar 1912 | Box 78 \ 2 scan0086 | |
| Copy of Mr. Royce's remarks concerning Fibre Bushes. | 12th Sep 1912 | Box 78 \ 2 scan0087 | |
| Instructions from Mr. Johnson regarding a plan to alter fibre bushes for customers. | 12th Sep 1912 | Box 78 \ 2 scan0088 | |
| The procedure for reaming out bushes and supplying suitable reamers. | 2nd Sep 1912 | Box 78 \ 2 scan0089 | |
| Departmental memo forwarding a communication from the Indian Depot for consideration by Mr. Royce and Mr. Johnson. | 2nd Sep 1912 | Box 78 \ 2 scan0090 | |
| Departmental memo detailing required alterations and performance issues with fibre bushes and carburetters on cars in India. | 17th Aug 1912 | Box 78 \ 2 scan0091 | |
| Departmental memo discussing carburettor water circulation, mascot appeal, and aluminium footboards for overseas markets. | 22th May 1912 | Box 78 \ 2 scan0092 | |
| Departmental memo discussing the suitability of vehicle components for hot climates. | 22th May 1912 | Box 78 \ 2 scan0093 | |
| Unsuitability of fibre bushes for use in India due to climate effects on road springs and magnetos. | 2nd Sep 1912 | Box 78 \ 2 scan0094 | |
| Departmental memo discussing standing orders for repair shops and an issue with a magneto. | 3rd May 1912 | Box 78 \ 2 scan0095 | |
| Decision from Mr Royce to increase the clearance on pins in spring bushes to prevent breakages caused by stress. | 27th Sep 1912 | Box 78 \ 2 scan0096 | |
| Issue with expanding fibre bushes and arrangements for their correction. | 26th Sep 1912 | Box 78 \ 2 scan0097 | |
| Note concerning front spring links and related parts. | 26th Sep 1912 | Box 78 \ 2 scan0098 | |
| Instruction to use steel washers for end play in front horns. | 2nd Dec 1912 | Box 78 \ 2 scan0099 | |
| Investigation into a knocking noise caused by spring bush clearance on Chassis No. 1560. | 9th Apr 1913 | Box 78 \ 2 scan0100 | |
| Typed internal memo discussing a complaint about a knock in a car. | 9th Apr 1913 | Box 78 \ 2 scan0101 | |
| Correct explanation for a noise, questioning whether it originates from spring bushes, spring shackles, or the car body. | 28th Apr 1913 | Box 78 \ 2 scan0102 | |
| Departmental memo regarding a rattling noise from the front spring shackles on car 2087E. | 6th May 1913 | Box 78 \ 2 scan0103 | |
| Rattling noise from the front spring shackles on car No. 2087E. | 7th May 1913 | Box 78 \ 2 scan0104 | |
| From F.H.R. to Mr Wormald regarding clearance specifications for front spring shackles. | 14th May 1913 | Box 78 \ 2 scan0105 | |
| Query about inserting a washer in front spring shackles to prevent rattling noise. | 20th May 1913 | Box 78 \ 2 scan0106 | |
| Departmental memo regarding a rattling noise from front spring shackles on chassis No.2087E. | 20th May 1913 | Box 78 \ 2 scan0107 | |
| Departmental memo regarding a customer's complaint about the springing slack on chassis No. 1560. | 11th Jun 1913 | Box 78 \ 2 scan0108 | |
| Customer report on front spring shackle slack for chassis No.1560. | 12th Jun 1913 | Box 78 \ 2 scan0109 | |
| Comments from Mr. Royce regarding a defect on Mr. R.P. Richard's chassis No. 1560. | 20th Jun 1913 | Box 78 \ 2 scan0110 | |
| From F.H.R. to C.J. regarding the slackness of spring pins to prevent seizure and breakage. | 30th Jun 1913 | Box 78 \ 2 scan0111 | |
| Discussion concerning a letter about spring link alterations and a subsequent positive customer review. | 30th Jun 1913 | Box 78 \ 2 scan0112 | |
| Note regarding a query about satisfying customer Mr. R. P. Richards concerning his chassis No 1560. | 1st Jul 1913 | Box 78 \ 2 scan0113 | |
| Response to a query about a customer's complaint regarding spring links on chassis 1560. | 7th Jul 1913 | Box 78 \ 2 scan0114 | |
| Front spring shackle wear, resulting noise, and recommendations for stronger springs. | 8th Jul 1913 | Box 78 \ 2 scan0115 | |
| Customer complaint about spring links on Chassis 1560 and its resolution by fitting heavier springs. | 7th Jul 1913 | Box 78 \ 2 scan0116 | |
| Record of experiments conducted on Sheradising components. | 14th Dec 1911 | Box 78 \ 2 scan0117 | |
| Confirming the decision to sheradize silencers and bottom exhaust boxes but not the exhaust box attached to the engine. | 1st Jul 1912 | Box 78 \ 2 scan0118 | |
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