| Description | Date | Identifier | |
| Oil consumption tests for the 'V' series carried out in France. | 15th Apr 1925 | Box 72 \ 1 scan0012 | |
| Comparing oil temperatures and consumption between a 'V' series and a standard 40/50 HP car. | 20th Apr 1925 | Box 72 \ 1 scan0013 | |
| Investigations of an oil relay governor. | 21th Apr 1925 | Box 72 \ 1 scan0014 | |
| Modifications to the oil relay ignition governor, specifically addressing issues with sticking inner pistons. | 1st Apr 1925 | Box 72 \ 1 scan0015 | |
| Modifications to the ignition advance control springs and hydraulic piston return spring. | 25th Sep 1924 | Box 72 \ 1 scan0016 | |
| Issues with a magneto return spring and the failure of cup leathers on test. | 21th Apr 1925 | Box 72 \ 1 scan0017 | |
| Cup leather failures in pistons, investigating the effects of oil temperature and viscosity. | 21th Apr 1925 | Box 72 \ 1 scan0018 | |
| Testing an ignition oil relay leather piston ring. | 21th Apr 1925 | Box 72 \ 1 scan0019 | |
| Graph showing the viscosity of Price's Motorine 'C' oil at various temperatures. | 20th Apr 1925 | Box 72 \ 1 scan0020 | |
| Graph of the ignition advance curve with engine requirements under extreme working conditions. | 20th Apr 1925 | Box 72 \ 1 scan0021 | |
| Piston ring testing and oil consumption. | 1st Apr 1925 | Box 72 \ 1 scan0022 | |
| Telegram from Royce regarding excessive oil consumption and a new design for piston, splasher, rings and trunk. | 27th Apr 1925 | Box 72 \ 1 scan0023 | |
| Wire confirmation from Royce to Hives concerning excessive oil consumption and sending a new piston and splasher design for testing. | 27th Apr 1925 | Box 72 \ 1 scan0024 | |
| Experiments for pistons with concave crowns and other components to test for oil consumption. | 28th Apr 1925 | Box 72 \ 1 scan0025 | |
| Extract detailing proposed engine modifications to improve excessive oil consumption. | 29th Apr 1925 | Box 72 \ 1 scan0026 | |
| 'V' series and Condor 'L' shaped piston rings and oil consumption tests. | 1st May 1925 | Box 72 \ 1 scan0027 | |
| Inconsistent oil consumption results due to the lapping of 'L' shaped piston rings. | 13th May 1925 | Box 72 \ 1 scan0028 | |
| Over-oiling on the 20 HP chassis and stretching rear axle spring clips. | 15th May 1925 | Box 72 \ 1 scan0029 | |
| EAC engine cylinder expansion and oiling problems. | 16th May 1925 | Box 72 \ 1 scan0030 | |
| Piston testing to address an over-oiling and oil consumption issue. | 19th May 1925 | Box 72 \ 1 scan0031 | |
| Graph of test bench results showing oil consumption curves for the E.A.C. engine. | 19th May 1925 | Box 72 \ 1 scan0032 | |
| Over-oiling on the EAC engine, suggesting a test with the piston pin oil feed shut off. | 6th Jun 1925 | Box 72 \ 1 scan0033 | |
| The oil consumption of trial cars and requesting continued monthly reports. | 6th Jun 1925 | Box 72 \ 1 scan0034 | |
| Resolving high oil consumption and cylinder overoiling by adopting a new 'L' section ring. | 15th Jun 1925 | Box 72 \ 1 scan0035 | |
| Cylinder overoiling, explaining the phenomenon through the action of chamfered piston rings. | 27th Feb 1925 | Box 72 \ 1 scan0036 | |
| Graph of oil consumption versus RPM for an E.A.C. engine, comparing different piston and ring configurations. | 11th Jul 1925 | Box 72 \ 1 scan0037 | |
| Oil consumption figures for three trials cars over the last month. | 11th Jul 1925 | Box 72 \ 1 scan0038 | |
| Proposed fix for an oil leak at the rear end of EAC and 20 HP engines. | 27th Aug 1925 | Box 72 \ 1 scan0039 | |
| Difficulty of creating a list of cars likely to be troubled with over-oiling. | 1st Sep 1925 | Box 72 \ 1 scan0040 | |
| Arranging cures for engine over-oiling in two specific cases and the uncertainty of a permanent solution. | 4th Sep 1925 | Box 72 \ 1 scan0041 | |
| Request for a list of complaints regarding over-oiling on the New Phantom chassis. | 18th Sep 1925 | Box 72 \ 1 scan0042 | |
| Complaints of over-oiling on specific New Phantom chassis. | 21th Sep 1925 | Box 72 \ 1 scan0043 | |
| Over-oiling problem with the New Phantom car engine after 10,000-mile tests. | 21th Sep 1925 | Box 72 \ 1 scan0044 | |
| Serious issue of 'overoiling' in the New Phantom model and proposing new testing procedures. | 22th Sep 1925 | Box 72 \ 1 scan0045 | |
| Page 2 of an internal memo regarding a visit to Mr. Royce to provide him with information on a serious situation. | 22th Sep 1925 | Box 72 \ 1 scan0046 | |
| Customer complaints and testing strategies for an overoiling issue on the New Phantom model. | 22th Sep 1925 | Box 72 \ 1 scan0047 | |
| The persistent over-oiling issue in the New Phantom model. | 25th Sep 1925 | Box 72 \ 1 scan0048 | |
| Page 2 of an experimental report concerning over-oiling problems in cars. | 12th Jun 1925 | Box 72 \ 1 scan0049 | |
| Modifications to a Phantom car going to France, covering the steering, front axle, and engine. | 26th Sep 1925 | Box 72 \ 1 scan0050 | |
| Investigating and proposing a solution for over-oiling on the 'Phantom' engine. | 28th Sep 1925 | Box 72 \ 1 scan0051 | |
| Instruction No.52 for the 40/50-HP Chassis regarding plugging oil holes in inlet rockers to fix excessive lubrication. | 29th Sep 1925 | Box 72 \ 1 scan0052 | |
| Limitations of high-speed 10,000-mile tests in detecting over-oiling issues on the 'New Phantom' model that only appear in slow traffic. | 29th Sep 1925 | Box 72 \ 1 scan0053 | |
| Specific case of engine over-oiling on a Phantom, sent to the Works for inspection. | 1st Oct 1925 | Box 72 \ 1 scan0054 | |
| Investigation into an over-oiling complaint on Phantom cars. | 10th Oct 1925 | Box 72 \ 1 scan0055 | |
| Lubrication piping system for owner-drivers to reach inaccessible points. | 13th Oct 1925 | Box 72 \ 1 scan0056 | |
| Chassis lubrication, centralized oiling schemes, and the Phantom car. | 15th Oct 1925 | Box 72 \ 1 scan0057 | |
| Testing and implementation of the Bijur chassis lubrication system, including a list of 38 lubrication points. | 15th Oct 1925 | Box 72 \ 1 scan0058 | |
| General adoption and benefits of centralized lubrication systems, with a specific note on steering for the Silver Ghost. | 1st Mar 1925 | Box 72 \ 1 scan0059 | |
| Reprint from the Society of Automotive Engineers journal describing a Central-Point Chassis-Lubrication System. | 1st Mar 1925 | Box 72 \ 1 scan0060 | |
| Detailed explanation of a central-point chassis lubrication system, its components, and operation. | 1st Mar 1925 | Box 72 \ 1 scan0061 | |
| Explanation of the central-point chassis lubrication system, detailing oil distribution, component design, and flow control. | 1st Mar 1925 | Box 72 \ 1 scan0062 | |
| Detailed description of the central-point chassis lubrication system, its components, operation, and an analogy to a single-wire electrical system. | 15th Oct 1925 | Box 72 \ 1 scan0063 | |
| The lubrication of steering pivots for the 'Phantom' model. | 15th Oct 1925 | Box 72 \ 1 scan0064 | |
| Slow running tests on a 'New Phantom' chassis to investigate over-oiling issues. | 26th Oct 1925 | Box 72 \ 1 scan0065 | |
| Technical observation on engine cylinder mixture and spark plug condition. | 22th Oct 1928 | Box 72 \ 1 scan0066 | |
| Daily test log detailing mileage, fuel consumption, and observations on engine plug and bore conditions. | 22th Oct 1928 | Box 72 \ 1 scan0067 | |
| Cover memorandum regarding over-oiling, attaching a related document for information. | 29th Oct 1925 | Box 72 \ 1 scan0068 | |
| Customer complaint from Sir Albert E. Bingham about over-oiling on his new Phantom car. | 29th Oct 1925 | Box 72 \ 1 scan0069 | |
| Spark plug options and a note on their performance in different car models. | 30th Oct 1925 | Box 72 \ 1 scan0070 | |
| Strategy for addressing an over-oiling issue on 'New Phantom' models. | 30th Oct 1925 | Box 72 \ 1 scan0071 | |
| Conference memo discussing over-oiling issues and piston ring tests on 'New Phantom' models. | 28th Oct 1925 | Box 72 \ 1 scan0072 | |
| Resolving engine over-oiling issues, the implementation of special road tests, and procedures for handling customer cars and complaints. | 28th Oct 1925 | Box 72 \ 1 scan0073 | |
| Customers over-filling engines with oil and a proposed solution of fitting an overflow cock. | 28th Oct 1925 | Box 72 \ 1 scan0074 | |
| Standardization of detachable ignition plugs for the 'New Phantom' chassis to address overoiling issues. | 13th Nov 1925 | Box 72 \ 1 scan0075 | |
| Special sparking plugs to address over-oiling issues. | 4th Nov 1925 | Box 72 \ 1 scan0076 | |
| Query asking for consideration on adopting a modification for all chassis prior to dispatch from the Works. | 25th Nov 1925 | Box 72 \ 1 scan0077 | |
| Issues with non-demountable Lodge sparking plugs on the 'New Phantom' model and the proposal to replace them. | 2nd Nov 1925 | Box 72 \ 1 scan0078 | |
| Copy of a letter discussing a customer complaint about the cleanability of standard Lodge spark plugs in an over-oiling engine. | 2nd Nov 1925 | Box 72 \ 1 scan0079 | |
| Change to demountable Lodge sparking plugs and the issue of plugging oil holes. | 5th Nov 1925 | Box 72 \ 1 scan0080 | |
| Plugging the oil hole in the New Phantom's inlet rocker to prevent over-oiling. | 6th Nov 1925 | Box 72 \ 1 scan0081 | |
| Investigation into a customer's suggestion regarding an over-oiling issue on a 40/50 car. | 11th May 1925 | Box 72 \ 1 scan0082 | |
| New Phantom over-oiling, specifically testing Lodge detachable spark plugs. | 9th Nov 1925 | Box 72 \ 1 scan0083 | |
| Over-oiling issues and the standardisation of new demountable Lodge sparking plugs. | 9th Nov 1925 | Box 72 \ 1 scan0084 | |
| Testing various spark plugs for over-oiling on the New Phantom model. | 12th Jun 1925 | Box 72 \ 1 scan0085 | |
| Comparing the mileage before failure of various makes of spark plugs. | 12th Jun 1925 | Box 72 \ 1 scan0086 | |
| Standardization and testing of a demountable Lodge ignition plug. | 10th Nov 1925 | Box 72 \ 1 scan0087 | |
| Request for information to reply to a previous memo regarding over-oiling and sparking plugs. | 10th Nov 1925 | Box 72 \ 1 scan0088 | |
| Forwarding a customer complaint letter regarding a new car oiling up badly. | 12th Nov 1925 | Box 72 \ 1 scan0089 | |
| Design of the vent pipe between the crankcase and carburetter to prevent oil entering the cylinder. | 13th Nov 1925 | Box 72 \ 1 scan0090 | |
| Check tests for New Phantom engine over-oiling, detailing procedures and results for four chassis. | 25th Nov 1925 | Box 72 \ 1 scan0091 | |
| Proposal for special tests at regular intervals during a 10,000-mile car test to gather evidence on component wear. | 25th Nov 1925 | Box 72 \ 1 scan0092 | |
| Suggesting a standard over-oiling test for a 'New Phantom' vehicle running in France. | 28th Nov 1925 | Box 72 \ 1 scan0093 | |
| The investigation into oily brake servo motors and their varying efficiency. | 12th Jun 1925 | Box 72 \ 1 scan0094 | |
| Issue with oil creeping onto servo friction plates and proposing solutions. | 1st Dec 1925 | Box 72 \ 1 scan0095 | |
| Blueprint diagram showing the distribution of oil through a mechanical assembly during excessive lubrication. | 11th Dec 1925 | Box 72 \ 1 scan0096 | |
| The distribution of information to overseas depots about engine overoiling on the 40/50 HP chassis. | 3rd Dec 1925 | Box 72 \ 1 scan0097 | |
| Technical bulletin detailing the symptoms and remedies for engine over-oiling in the 40/50 HP 'New Phantom' chassis. | 8th Oct 1925 | Box 72 \ 1 scan0098 | |
| Instructions on plugging rocker arm holes and subsequent engine testing procedures. | 2nd Dec 1925 | Box 72 \ 1 scan0099 | |
| Instruction sheet on fitting Lodge Detachable Sparking Plugs to the 40/50 HP 'New Phantom' chassis to address overoiling issues. | 2nd Dec 1925 | Box 72 \ 1 scan0100 | |
| The comparison of 3 and 7 oil feeds to crankshaft bearings. | 1st Dec 1925 | Box 72 \ 1 scan0101 | |
| New Phantom engine experiments comparing 7 and 3 direct oil feeds. | 12th Jun 1925 | Box 72 \ 1 scan0102 | |
| Oil consumption and discharge through engine bearings, comparing different oil feed configurations. | 12th Jun 1925 | Box 72 \ 1 scan0103 | |
| Page with a graph showing oil consumption and discharge versus engine RPM for different bearing feeds. | 12th Jun 1925 | Box 72 \ 1 scan0104 | |
| Investigating oil pressure differences between direct and indirect supply engine bearings. | 12th Jun 1925 | Box 72 \ 1 scan0105 | |
| Analyzing oil pressure in relation to engine speed for various main bearings. | 12th Jun 1925 | Box 72 \ 1 scan0106 | |
| Oil pressure and consumption related to engine bearing clearances, including a graph of oil pressure versus RPM. | 12th Jun 1925 | Box 72 \ 1 scan0107 | |
| With a graph detailing oil consumption tests on the 40/50 HP Silver Ghost and Phantom engines. | 12th Jun 1925 | Box 72 \ 1 scan0108 | |
| Oil consumption and oil temperature rise in relation to engine speed. | 12th Jun 1925 | Box 72 \ 1 scan0109 | |
| Page discussing the temperature rise of oil flow through engine bearings. | 1st Dec 1925 | Box 72 \ 1 scan0110 | |
| Oiling tests for the Phantom model. | 15th Dec 1925 | Box 72 \ 1 scan0111 | |
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