| Description | Date | Identifier | |
| Fuel tests on Shell Eastern Spirit, comparing it with benzol and petrol mixtures to prevent engine detonations and pre-ignitions. | 2nd Apr 1919 | Box 1 \ 2 B001_X 53-page10 | |
| Adding a percentage of benzol to petrol for the Atlantic Flights. | 2nd Apr 1919 | Box 1 \ 2 B001_X 53-page11 | |
| Development of radiator louvres to improve engine performance in cold weather. | 9th Apr 1919 | Box 1 \ 2 B001_X 53-page12 | |
| Engine performance when changing from petrol to benzol fuel from Birchenwood Collieries. | 9th Apr 1919 | Box 1 \ 2 B001_X 53-page13 | |
| From R. to E.H. investigating the possibility of removing the carburetter's hot water jacket due to suspected fuel boiling issues. | 20th May 1919 | Box 1 \ 2 B001_X 53-page14 | |
| Specifying the weight for a special float for use with 100% benzol fuel. | 24th May 1919 | Box 1 \ 2 B001_X 53-page15 | |
| Offer of assistance from the chemists at Staveley Iron Works for fuel testing. | 3rd Jun 1919 | Box 1 \ 2 B001_X 53-page16 | |
| The use of benzol fuel, referencing a possible jelly mixture and experiences with different brands. | 28th Jun 1919 | Box 1 \ 2 B001_X 53-page17 | |
| And engine report for car No. 789, detailing its condition after 40,000 miles. | 24th Jul 1919 | Box 1 \ 2 B001_X 53-page18 | |
| Letter from a customer detailing collision damage and requesting an engine inspection after long-term use of Benzole fuel. | 7th Jun 1919 | Box 1 \ 2 B001_X 53-page19 | |
| Page two of a letter from W. Butler discussing a vehicle's usage history and arrangements for an examination. | 7th Jun 1919 | Box 1 \ 2 B001_X 53-page20 | |
| Letter from a fuel supplier enquiring about the performance of Benzole motor spirit in vehicles. | 1st Aug 1919 | Box 1 \ 2 B001_X 53-page21 | |
| Internal correspondence slip regarding a query from Phillips & Co. Ltd. about Benzole Motor Spirit. | 4th Aug 1919 | Box 1 \ 2 B001_X 53-page22 | |
| Royal Automobile Club Certificate of Performance for a 10,000-mile trial of National Benzole fuel. | 7th Jan 1920 | Box 1 \ 2 B001_X 53-page23 | |
| 10,007.25-mile trial, detailing routes, performance, fuel consumption, and post-trial engine condition. | 27th Feb 1920 | Box 1 \ 2 B001_X 53-page24 | |
| Advisory on the corrosive effects of sulphur in benzol fuel on car components. | 26th Jan 1920 | Box 1 \ 2 B001_X 53-page25 | |
| Proposing an update to the Chassis Instruction Book regarding the use of benzol fuel mixtures. | 4th Feb 1920 | Box 1 \ 2 B001_X 53-page26 | |
| Issues with gauze for petrol strainers, suspecting the sulphur in benzol as the cause. | 9th Feb 1920 | Box 1 \ 2 B001_X 53-page27 | |
| Recommendations for the use of Benzole fuel mixture in the chassis instruction book. | 10th Feb 1920 | Box 1 \ 2 B001_X 53-page28 | |
| Internal query regarding the experience of running a car on 100% Benzol fuel for a client. | 28th Feb 1920 | Box 1 \ 2 B001_X 53-page29 | |
| Corrosive action of Benzol fuel on copper engine components and related running issues. | 12th Mar 1920 | Box 1 \ 2 B001_X 53-page30 | |
| Covering memo regarding the re-use of Benzol, attaching a memo from the Sales Department. | 9th Mar 1920 | Box 1 \ 2 B001_X 53-page31 | |
| Requesting information regarding the use of Benzole. | 18th Mar 1920 | Box 1 \ 2 B001_X 53-page32 | |
| Follow-up memo chasing a reply regarding an enquiry about running a car on 100% Benzole. | 17th Mar 1920 | Box 1 \ 2 B001_X 53-page33 | |
| The use of benzol as fuel, advising against 100% benzol and recommending a 50/50 petrol-benzol mixture. | 19th Mar 1920 | Box 1 \ 2 B001_X 53-page34 | |
| Requesting guidance on the use of Benzole fuel for their cars. | 31th Mar 1920 | Box 1 \ 2 B001_X 53-page35 | |
| Extracts from a report on Mr. A.L. Onslow's chassis No.173, detailing springing and petrol consumption. | 7th Apr 1920 | Box 1 \ 2 B001_X 53-page36 | |
| Short note suggesting sending extracts to a person or department 'R'. | 7th Apr 1920 | Box 1 \ 2 B001_X 53-page37 | |
| Requesting further information regarding the use of Benzole. | 13th Apr 1920 | Box 1 \ 2 B001_X 53-page38 | |
| To re-estimate the monthly requirements of National Benzole fuel. | 28th Jul 1920 | Box 1 \ 2 B001_X 53-page39 | |
| Letter from The National Benzole Company Ltd. regarding the supply of National Benzole due to inadequate production. | 27th Jul 1920 | Box 1 \ 2 B001_X 53-page40 | |
| Challenge of obtaining regular deliveries of National Benzole and increasing requirements to 1000 gallons per fortnight. | 29th Jul 1920 | Box 1 \ 2 B001_X 53-page41 | |
| Letter from the National Benzole Company promoting their fuel and a special lubricating oil. | 1st Nov 1920 | Box 1 \ 2 B001_X 53-page42 | |
| Protected price list for N.B.C. Benzole Lubricants for commercial users. | 1st Oct 1920 | Box 1 \ 2 B001_X 53-page43 | |
| Laboratory report on gauze filter corrosion caused by Benzol, detailing the effects of sulphur and water. | 30th Jul 1920 | Box 1 \ 2 B001_X 53-page44 | |
| Request for a list of tested benzols to be ranked in order of merit. | 25th Nov 1920 | Box 1 \ 2 B001_X 53-page45 | |
| Problems caused by impure benzol fuel and the lack of progress in testing to find a pure alternative for customers. | 23th Nov 1920 | Box 1 \ 2 B001_X 53-page46 | |
| Notice to car owners regarding engine operation with low-grade petrol and benzol. | 15th Feb 1919 | Box 1 \ 2 B001_X 53-page47 | |
| Requesting information on the deleterious effects of various qualities of Benzol fuel on copper parts, particularly petrol tank filters. | 17th Nov 1920 | Box 1 \ 2 B001_X 53-page48 | |
| The testing of different brands of benzol for Chassis No. 1248. | 15th Nov 1920 | Box 1 \ 2 B001_X 53-page49 | |
| Request for carburettor adjustment information for using Benzole fuel, for a booklet by the National Benzole Association. | 6th May 1921 | Box 1 \ 2 B001_X 53-page50 | |
| Recommendation to use a half Benzole and half petrol fuel mixture for demonstration purposes. | 28th Jul 1922 | Box 1 \ 2 B001_X 53-page51 | |
| Follow-up request for information on the advisability of using Benzol fuel in a 20 HP chassis. | 13th Apr 1923 | Box 1 \ 2 B001_X 53-page52 | |
| Confirming that recommendations for Benzol use in the 40/50 HP engine also apply to the 20 HP engine. | 30th Apr 1923 | Box 1 \ 2 B001_X 53-page53 | |
| On carburetter float materials, corrosion issues with benzol, and testing of Duckhams New Process Oil. | 4th Apr 1924 | Box 1 \ 2 B001_X 53-page54 | |
| Storage and use of National Benzole mixture in cars. | 18th Jul 1924 | Box 1 \ 2 B001_X 53-page55 | |
| Letter from the National Benzole Company inquiring about the performance of their fuel mixture in Rolls-Royce engines. | 11th Sep 1924 | Box 1 \ 2 B001_X 53-page56 | |
| Letter from the National Benzole Company Ltd. enquiring about the suitability of using Benzole as a fuel in Rolls-Royce cars. | 26th Nov 1924 | Box 1 \ 2 B001_X 53-page57 | |
| Letter to the National Benzole Company Ltd. concerning the use of Benzole fuel in a 20-HP car. | 28th Nov 1924 | Box 1 \ 2 B001_X 53-page58 | |
| The use of Benzole fuel with 40/50 and 20-HP cars. | 28th Nov 1924 | Box 1 \ 2 B001_X 53-page59 | |
| Required weight of a 20 HP engine float for use with Benzol fuel. | 1st Jan 1925 | Box 1 \ 2 B001_X 53-page60 | |
| Laboratory report detailing the distillation and analysis of a 50/50 Petrol-Benzole sample. | 16th Jan 1925 | Box 1 \ 2 B001_X 53-page61 | |
| Laboratory analysis report on a petrol sample containing 11.5% benzole. | 16th Jan 1925 | Box 1 \ 2 B001_X 53-page62 | |
| Laboratory analysis comparing the chemical composition of Redline and Shell-Mex motor spirits. | 16th Jan 1925 | Box 1 \ 2 B001_X 53-page63 | |
| Engine pinking and detonation in 20 HP and New Phantom models, and the potential use of a Benzole mixture to resolve the issue. | 9th Jun 1926 | Box 1 \ 2 B001_X 53-page64 | |
| Engine pinking and detonation, recommending the use of National Benzol Mixture fuel. | 1st Jun 1926 | Box 1 \ 2 B001_X 53-page65 | |
| The use of National Benzol Mixture and the policy on fuel recommendations. | 16th Jul 1926 | Box 1 \ 2 B001_X 53-page66 | |
| Low aromatic content in a 20% Benzol mixture for the Eagle XV Type Test and suggesting potential fuel separation. | 29th Oct 1926 | Box 1 \ 2 B001_X 53-page67 | |
| Test report from the Non-Metallic Test House on a sample of Petrol-Benzol mixture. | 26th Oct 1926 | Box 1 \ 2 B001_X 53-page68 | |
| Suitability of chamois leather petrol filters when using benzol and exploring alternative filter types. | 1st Dec 1926 | Box 1 \ 2 B001_X 53-page69 | |
| The use of Benzol fuel in Phantom cars, requiring an increase in carburetter float weight. | 30th Dec 1926 | Box 1 \ 2 B001_X 53-page70 | |
| The decision not to use chamois leather for petrol filters due to the material rotting. | 5th Jan 1927 | Box 1 \ 2 B001_X 53-page71 | |
| Arranging a Condor IV engine type test using different Benzol fuel mixtures to investigate gumming. | 3rd Mar 1927 | Box 1 \ 2 B001_X 53-page72 | |
| Confirming no objection to using National Benzole Mixture fuel in 40/50 HP and 20 HP cars. | 28th Apr 1927 | Box 1 \ 2 B001_X 53-page73 | |
| Proposal to adopt Aviation fuel with 20% Benzol as the standard for all aero engine testing, with a preference for Shell as the supplier. | 1st May 1927 | Box 1 \ 2 B001_X 53-page74 | |
| From the Aeronautical Inspection Directorate concerning an analysis of a 20% Benzol mixture. | 2nd Jun 1927 | Box 1 \ 2 B001_X 53-page75 | |
| Test report on a sample of 80% Aviation Spirit plus 20% Benzol for the F.X. Engine No. 18. | 9th May 1927 | Box 1 \ 2 B001_X 53-page76 | |
| Analysis of a Shell Aviation and Benzol fuel mixture which is low in aromatic content. | 13th Jun 1927 | Box 1 \ 2 B001_X 53-page77 | |
| Laboratory report on the specific gravity and aromatic hydrocarbon content of a 20% Benzol Mixture. | 17th Oct 1927 | Box 1 \ 2 B001_X 53-page78 | |
| To the technical committee proposing a simple scheme to fix explosions in the silencer. | 3rd Mar 1912 | Box 1 \ 3 B001_X 93-page01 | |
| Throttle control mechanisms and petrol efficiency, comparing a proposed idea to Lanchester's design. | 3rd Apr 1912 | Box 1 \ 3 B001_X 93-page02 | |
| Design drawing with notes for an improved double throttle mechanism. | 3rd Apr 1912 | Box 1 \ 3 B001_X 93-page03 | |
| Technical committee memo discussing the causes of explosions in the silencer. | 18th Mar 1912 | Box 1 \ 3 B001_X 93-page04 | |
| Proposal for a scheme to automatically weaken the engine mixture when the car is over-running. | 18th Mar 1912 | Box 1 \ 3 B001_X 93-page05 | |
| Proposal to the Technical Committee for preventing explosions in silencers when running downhill. | 18th Mar 1912 | Box 1 \ 3 B001_X 93-page06 | |
| Letter discussing the problem of explosions in the silencer and proposing a simple solution involving the throttle and carburetter. | 3rd Apr 1912 | Box 1 \ 3 B001_X 93-page07 | |
| Idea for engine throttle control and its benefits compared to other engine designs like the Lanchester. | 18th Dec 1912 | Box 1 \ 3 B001_X 93-page08 | |
| Design drawing detailing an improved double throttle mechanism with notes on component assembly and function. | 3rd Apr 1912 | Box 1 \ 3 B001_X 93-page09 | |
| Proposal to prevent explosions in the silencer by modifying the hand control and adding an air valve. | 3rd Apr 1912 | Box 1 \ 3 B001_X 93-page10 | |
| Page with a typed note, likely an instruction or a divider. | 14th Mar 1912 | Box 1 \ 3 B001_X 93-page11 | |
| Request for an experimental design for a special throttle to overcome explosions in the silencer when running downhill. | 17th Jan 1912 | Box 1 \ 3 B001_X 93-page12 | |
| Page indicating a temporary abandonment. | 14th Jul 1919 | Box 1 \ 3 B001_X 93-page13 | |
| Reducing engine vibrations through piston and connecting rod modifications, and a note on a throttle valve alteration. | 18th Apr 1912 | Box 1 \ 3 B001_X 93-page14 | |
| To Mr. Royce regarding a visit to drop forging plants and a throttle modification. | 27th Apr 1912 | Box 1 \ 3 B001_X 93-page15 | |
| Progress report on a device test, noting a slight engine hesitation issue under investigation. | 30th Apr 1912 | Box 1 \ 3 B001_X 93-page16 | |
| Departmental memo about a temporary fix for silencer explosions using a felt pad that caught fire, and a request for a non-combustible version. | 30th Apr 1912 | Box 1 \ 3 B001_X 93-page17 | |
| Departmental memo about a successful experiment concerning petrol knocking in the carburettor. | 18th Mar 1912 | Box 1 \ 3 B001_X 93-page18 | |
| Letter to Mr Royce discussing two schemes for a special throttle and low-speed throat valve. | 2nd May 1912 | Box 1 \ 3 B001_X 93-page19 | |
| The experimental testing of a low-speed valve, carburetter modifications, and issues encountered such as a fire. | 8th Jul 1912 | Box 1 \ 3 B001_X 93-page20 | |
| Departmental memo regarding tests on double throttle and Polyrhoe carburettors to understand explosions in the silencer. | 8th Jul 1912 | Box 1 \ 3 B001_X 93-page21 | |
| Departmental memo discussing engine trouble accentuated by the induction pipe cock during retardation after running at high speeds. | 3rd May 1912 | Box 1 \ 3 B001_X 93-page22 | |
| Departmental memo discussing engine misfiring and comparing carburettor performance regarding a 'fading away' effect and fuel spray. | 3rd May 1912 | Box 1 \ 3 B001_X 93-page23 | |
| Departmental memo regarding a suggested carburettor alteration and the availability of double throttles. | 3rd May 1912 | Box 1 \ 3 B001_X 93-page24 | |
| Explosions in the silencer and the effect of changing ignition plug types from Pognon to Bosch. | 10th Jul 1912 | Box 1 \ 3 B001_X 93-page25 | |
| Departmental memo regarding the satisfactory standard use of Bosch plugs, specifically in Mr Johnson's car 'The Mystery'. | 3rd May 1912 | Box 1 \ 3 B001_X 93-page26 | |
| Explosions in the silencer and the performance of Pognon versus Bosch ignition plugs. | 12th Jul 1912 | Box 1 \ 3 B001_X 93-page27 | |
| Page 2 of a memo discussing the performance of Bosch plugs fitted as standard. | 22th Jul 1912 | Box 1 \ 3 B001_X 93-page28 | |
| Departmental memo regarding explosions in the silencer and carburettor jet modifications. | 22th Jul 1912 | Box 1 \ 3 B001_X 93-page29 | |
| Report comparing a Special Double Throttle carburetter with a Polyrhoe carburetter regarding explosions in the silencer. | 25th Jul 1912 | Box 1 \ 3 B001_X 93-page30 | |
| Diagnosis of engine trouble involving explosive gas in the silencer and issues with the induction pipe and carburetter. | 25th Jul 1912 | Box 1 \ 3 B001_X 93-page31 | |
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