| Description | Date | Identifier | |
| Engine performance issues like misfiring and the 'fading away' effect observed during carburetter experiments. | 25th Jul 1912 | Box 1 \ 3 B001_X 93-page32 | |
| Planned dynamometer experiments comparing two carburettors, including the Polyrhoe. | 19th Aug 1912 | Box 1 \ 3 B001_X 93-page33 | |
| Experimental Department report on the cause and cure for explosions in the silencer. | 19th Aug 1912 | Box 1 \ 3 B001_X 93-page34 | |
| Diagnosis of engine explosions in the silencer under various operating conditions. | 20th Aug 1912 | Box 1 \ 3 B001_X 93-page35 | |
| Report to Mr Royce from the Experimental Department regarding carburetter tests for a special throttle valve. | 20th Aug 1912 | Box 1 \ 3 B001_X 93-page36 | |
| Technical note detailing the causes of engine explosions and misfires. | 25th Nov 1912 | Box 1 \ 3 B001_X 93-page37 | |
| From F.H. Royce regarding distressing exhaust explosions and gearbox noise on Mr Johnson's car. | 25th Nov 1912 | Box 1 \ 3 B001_X 93-page38 | |
| Mr. Royce's remarks on an urgency report regarding improvements in throttle and cutting off. | 28th Apr 1913 | Box 1 \ 3 B001_X 93-page39 | |
| Chasing the progress of experiments on carburetter explosions in the silencer. | 29th Apr 1913 | Box 1 \ 3 B001_X 93-page40 | |
| Chasing up an overdue experiment on carburettor explosions in the silencer, requested by Mr Royce. | 29th Apr 1913 | Box 1 \ 3 B001_X 93-page41 | |
| Cover memo requesting an update on instructions for experiments concerning explosions in the silencer. | 27th May 1913 | Box 1 \ 3 B001_X 93-page42 | |
| Engine exhaust backfiring, known as 'firing in silencer', and the potential effects of boilers and a new cylinder head. | 28th Apr 1925 | Box 1 \ 3 B001_X 93-page43 | |
| Issue of popping in the exhaust on the new Phantom model and modifications made to address it. | 6th Mar 1926 | Box 1 \ 3 B001_X 93-page44 | |
| Investigation into detonation issues on Phantom engines, proposing increased turbulence in the combustion chamber as a solution. | 1st Mar 1926 | Box 1 \ 3 B001_X 93-page45 | |
| Phantom engine performance issues, comparing fuel consumption, self-ignition, and detonation to the Silver Ghost. | 1st Mar 1926 | Box 1 \ 3 B001_X 93-page46 | |
| Engine detonation tests, focusing on the effects of ignition plugs and engine speed. | 1st Mar 1926 | Box 1 \ 3 B001_X 93-page47 | |
| Engine detonation tests involving varied carburetter air temperatures and news of a new cylinder head for the Phantom. | 11th May 1926 | Box 1 \ 3 B001_X 93-page48 | |
| Customer complaints about popping and explosions in the New Phantom exhaust. | 11th May 1926 | Box 1 \ 3 B001_X 93-page49 | |
| The issue of popping and explosions in the exhaust of the New Phantom model. | 10th May 1926 | Box 1 \ 3 B001_X 93-page50 | |
| Governor control issues and exhaust popping in the New Phantom model. | 10th May 1926 | Box 1 \ 3 B001_X 93-page51 | |
| The causes of explosions in the silencer, related to the carburettor's operation at low throttle. | 18th May 1926 | Box 1 \ 3 B001_X 93-page52 | |
| Engine issues for car 7-EX, specifically firing in the exhaust, self-ignition, and running backwards after extended mileage. | 4th Jun 1926 | Box 1 \ 3 B001_X 93-page53 | |
| Engine pinking and detonation, and the suitability of using National Benzol Mixture fuel. | 14th Jun 1926 | Box 1 \ 3 B001_X 93-page54 | |
| Experiments to determine the cause of explosions in the silencer of a Phantom vehicle. | 1st Aug 1926 | Box 1 \ 3 B001_X 93-page55 | |
| Analysis into the cause of continuous explosions when an engine is coasting with a slightly open throttle. | 13th Aug 1926 | Box 1 \ 3 B001_X 93-page56 | |
| Experimental results report on engine firing issues related to exhaust manifold, mixture strength, and throttle settings. | 1st Aug 1926 | Box 1 \ 3 B001_X 93-page57 | |
| Analysis of engine explosions in the exhaust manifold under different throttle and mixture conditions. | 1st Aug 1926 | Box 1 \ 3 B001_X 93-page58 | |
| The causes of explosions in the exhaust manifold and silencer. | 23th Aug 1926 | Box 1 \ 3 B001_X 93-page59 | |
| Experiments concerning explosions in the silencer of a Phantom model, focusing on the effect of admitting air to the induction pipe. | 23th Aug 1926 | Box 1 \ 3 B001_X 93-page60 | |
| Analysis of engine running conditions, focusing on air dilution, silencer explosions, and the effects of a rich mixture. | 23th Aug 1926 | Box 1 \ 3 B001_X 93-page61 | |
| Investigation into irregular firing and exhaust explosions related to carburettor mixture and ignition timing. | 23th Aug 1926 | Box 1 \ 3 B001_X 93-page62 | |
| Technical report on tests to reduce explosions in the exhaust system using wire gauze and considering the effect of the governor. | 23th Aug 1926 | Box 1 \ 3 B001_X 93-page63 | |
| Summary of methods to prevent continuous explosions in the silencer. | 23th Aug 1926 | Box 1 \ 3 B001_X 93-page64 | |
| Experiments to fix silencer explosions and autovac issues on the 8-EX car. | 1st Sep 1926 | Box 1 \ 3 B001_X 93-page65 | |
| Letter concerning a customer complaint about a backfiring issue on a New Phantom chassis. | 10th Sep 1926 | Box 1 \ 3 B001_X 93-page66 | |
| Investigations into explosions in the silencer, comparing the Phantom to the Silver Ghost. | 11th Sep 1926 | Box 1 \ 3 B001_X 93-page67 | |
| Engine issue known as 'popping back', its causes, and a comparison with other engines. | 13th Sep 1926 | Box 1 \ 3 B001_X 93-page68 | |
| Letter from the American branch about explosions in the silencer when descending hills. | 17th Sep 1926 | Box 1 \ 3 B001_X 93-page69 | |
| Requesting an update on the examination of a Phantom car reported to have explosions in the silencer. | 5th Oct 1926 | Box 1 \ 3 B001_X 93-page70 | |
| Investigation into the cause of explosions in silencers. | 10th Oct 1926 | Box 1 \ 3 B001_X 93-page71 | |
| Test procedure for diagnosing explosions in a Phantom model's silencer by creating an adjustable air leak. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page72 | |
| Summary of conclusions from reports on a fault causing explosions in the silencer. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page73 | |
| Conditions under which explosions occur in the silencer of a Phantom chassis. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page74 | |
| The causes of engine explosions related to governor and throttle settings. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page75 | |
| Analysis of methods to eliminate induction system explosions by altering the air-fuel mixture. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page76 | |
| Engine slow running, throttle issues, and causes of firing in the silencer. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page77 | |
| Throttle closing issues caused by carbon deposits and worn spindle bearings. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page78 | |
| List of general tests carried out with regard to explosions in the silencer. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page79 | |
| List of checks and potential improvements for engine running faults relating to the throttle and carburetter. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page80 | |
| Investigation into the causes of silencer explosions, comparing the Silver Ghost and Phantom models. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page81 | |
| Comparison of ignition characteristics and throttle design between the Silver Ghost and Phantom models. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page82 | |
| Technical note comparing silencer explosions and fuel mixture requirements between the Silver Ghost and Phantom models. | 8th Oct 1926 | Box 1 \ 3 B001_X 93-page83 | |
| Explosions in a silencer, referencing the Barker Trials Car. | 8th Oct 1926 | Box 1 \ 3 B001_X 93-page84 | |
| Explosions and engine stalling issues in the New Phantom model. | 18th Oct 1926 | Box 1 \ 3 B001_X 93-page85 | |
| Telegram about trying a Phantom vehicle, investigating silencer explosions and viewing the latest standard. | 19th Oct 1926 | Box 1 \ 3 B001_X 93-page86 | |
| Telegram message regarding a chassis with 'minimum explosions' and a request to test drive it. | 20th Oct 1926 | Box 1 \ 3 B001_X 93-page87 | |
| Test of a special throttle ball bearing to prevent silencer explosions in Phantom cars. | 20th Oct 1926 | Box 1 \ 3 B001_X 93-page88 | |
| Customer complaints about engine noise and throttle issues, proposing testing a car without a governor. | 22th Oct 1926 | Box 1 \ 3 B001_X 93-page89 | |
| Two potential modifications for the Phantom throttle control, weighing cost, performance, and driver experience. | 2nd Nov 1926 | Box 1 \ 3 B001_X 93-page90 | |
| Comparing governor and positive throttle control systems to prevent explosions in the silencer. | 15th Nov 1926 | Box 1 \ 3 B001_X 93-page91 | |
| Report page discussing throttle and governor control adjustments to prevent explosions in the silencer. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page92 | |
| Analysis of engine explosions, comparing the Phantom model unfavourably with the Silver Ghost. | 7th Oct 1926 | Box 1 \ 3 B001_X 93-page93 | |
| Performance noting it is quieter than the Phantom and a mention of an upcoming report on the roller bearing throttle. | 17th Oct 1927 | Box 1 \ 3 B001_X 93-page94 | |
| Cause of 'spitting in silencer' being badly bedded butterfly throttles and a proposed fix. | 17th Oct 1927 | Box 1 \ 3 B001_X 93-page95 | |
| Proposal to experiment with a third valve in an internal combustion engine to address detonation. | 11th Nov 1927 | Box 1 \ 3 B001_X 93-page96 | |
| Page 2 of a letter with a handwritten response discussing engine detonation, turbulence, and volumetric efficiency. | 21th Dec 1927 | Box 1 \ 3 B001_X 93-page97 | |
| Engine detonation, roughness, and volumetric efficiency. | 21th Dec 1927 | Box 1 \ 3 B001_X 93-page98 | |
| The types and quantities of plugs taken to France. | 3rd Nov 1932 | Box 1 \ 4 B001_X 100a-page001 | |
| Carburettor choking due to fuel supply issues and a subsequent starter motor failure. | 1st Jan 1932 | Box 1 \ 4 B001_X 100a-page002 | |
| Flywheel pinion issue, petrol consumption, and a noise from the electric clock. | 5th Nov 1932 | Box 1 \ 4 B001_X 100a-page003 | |
| The oil temperature of a Peregrine engine during a run from Derby to London. | 5th Nov 1932 | Box 1 \ 4 B001_X 100a-page004 | |
| Letter to G.W. Hancock requesting feedback on engine mounting, shock absorbers, and exhaust system performance following a trip. | 5th Nov 1932 | Box 1 \ 4 B001_X 100a-page005 | |
| Typed memo discussing oil cooling and confirming travel arrangements to France. | 5th Nov 1932 | Box 1 \ 4 B001_X 100a-page006 | |
| Report detailing multiple vehicle failures including issues with the carburettor, bearings, oil pressure, and high oil temperature. | 6th Nov 1932 | Box 1 \ 4 B001_X 100a-page007 | |
| Report detailing issues with a vehicle's steering, stability, oil pump, water loss, and dynamo output. | 9th Oct 1934 | Box 1 \ 4 B001_X 100a-page008 | |
| Post office telegram from Chateauroux, France confirming arrival and advising a report is in the post. | 9th Oct 1934 | Box 1 \ 4 B001_X 100a-page009 | |
| Informational notice about postal and telegram services. | 7th Nov 1932 | Box 1 \ 4 B001_X 100a-page010 | |
| Letter detailing repair and adjustment work on a vehicle, written on 'Hotel de France' letterhead. | 7th Nov 1932 | Box 1 \ 4 B001_X 100a-page011 | |
| Various faults including slack brake ropes, a loose silencer, a blocked drain plug, a weak spare wheel carrier, and oil leaks. | 7th Nov 1932 | Box 1 \ 4 B001_X 100a-page012 | |
| With diagrams illustrating a design issue with an oil chamber and its suggested correction. | 8th Nov 1932 | Box 1 \ 4 B001_X 100a-page013 | |
| Tests on a side torque damper and engine mounting dampers. | 8th Nov 1932 | Box 1 \ 4 B001_X 100a-page014 | |
| Test results on engine torque reaction with different damper configurations and speeds. | 8th Nov 1932 | Box 1 \ 4 B001_X 100a-page015 | |
| Torque reaction and shock absorber performance. | 8th Nov 1932 | Box 1 \ 4 B001_X 100a-page016 | |
| Engine issues, specifically lateral play in the ignition distributor and carburetor adjustments. | 8th Nov 1932 | Box 1 \ 4 B001_X 100a-page017 | |
| Knock from a connecting link and a loss of water from the radiator. | 9th Nov 1932 | Box 1 \ 4 B001_X 100a-page018 | |
| Series of tests on front torque reaction dampers to determine their effectiveness. | 9th Nov 1932 | Box 1 \ 4 B001_X 100a-page019 | |
| Test report on engine torque dampers and an exhaust silencer, concluding with a petrol pipe failure. | 9th Nov 1932 | Box 1 \ 4 B001_X 100a-page020 | |
| Short memo from G.W.H. confirming the dispatch of daily mileage reports from France. | 9th Nov 1932 | Box 1 \ 4 B001_X 100a-page021 | |
| Changing engine mounting rubbers, modifying the water pump to reduce water loss, and identifying sources of rigidity affecting the flexible engine mounting. | 10th Nov 1932 | Box 1 \ 4 B001_X 100a-page022 | |
| Issues with the ignition distributor, oil levels, road springs, and bonnet alignment. | 10th Nov 1932 | Box 1 \ 4 B001_X 100a-page023 | |
| Engine mounting tests, specifically concerning torque reaction dampers, rubber softness, and radiator water loss. | 10th Nov 1932 | Box 1 \ 4 B001_X 100a-page024 | |
| Engine tightness and issues with front shock damper mounting. | 30th Nov 1932 | Box 1 \ 4 B001_X 100a-page025 | |
| Fractured petrol pipe on a car and the arrangement for a replacement part. | 11th Nov 1932 | Box 1 \ 4 B001_X 100a-page026 | |
| 'Peregrine Test in France', including alternative engine mountings and a test on a Dubonnet car. | 11th Nov 1932 | Box 1 \ 4 B001_X 100a-page027 | |
| Testing aniline as a lubricant additive, alongside notes on engine stiffness, water loss, and carburation. | 11th Nov 1932 | Box 1 \ 4 B001_X 100a-page028 | |
| Vehicle component fault and performance report, page 2. | 11th Nov 1932 | Box 1 \ 4 B001_X 100a-page029 | |
| Oil leak from the rear universal joint of the propeller shaft. | 11th Nov 1932 | Box 1 \ 4 B001_X 100a-page030 | |
| Letter to a representative in France discussing car development progress, including exhaust, brake, engine, and clutch issues, and arranging a visit. | 11th Nov 1932 | Box 1 \ 4 B001_X 100a-page031 | |
| Vehicle performance issues including high oil temperature, oil and water loss, and component faults following a 500-mile test run. | 12th Nov 1932 | Box 1 \ 4 B001_X 100a-page032 | |
| Engine roughness over 60 m.p.h. and a squeaking front spring after driving on French roads. | 13th Nov 1932 | Box 1 \ 4 B001_X 100a-page033 | |
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