| Description | Date | Identifier | |
| Radiator design improvements for 45 HP and 25 HP models, focusing on material changes and new features. | 22th May 1931 | Box 131 \ 1 scan0011 | |
| Radiator designs and overheating complaints, comparing large and small hexagonal tubes. | 27th May 1931 | Box 131 \ 1 scan0012 | |
| Solutions to customer complaints about overheating, focusing on radiator design and tube size. | 28th May 1931 | Box 131 \ 1 scan0013 | |
| Risk of overheating and water boiling in radiators and potential modifications. | 5th Jun 1931 | Box 131 \ 1 scan0014 | |
| Standardisation of a hexagon USA tube and modifications to bonnet openings to improve safety and reduce weight. | 5th Jun 1931 | Box 131 \ 1 scan0015 | |
| Overheating issue on a L.H. Phantom II model, related to a misunderstanding about bonnet shutters. | 17th Aug 1931 | Box 131 \ 1 scan0016 | |
| Letter from Rolls-Royce of America concerning overheating issues with L.H. Phantom II cars during hot weather. | 5th Aug 1931 | Box 131 \ 1 scan0017 | |
| Overheating issues and potential cooling improvements for L.H. Phantom II cars in the U.S.A. | 21th Aug 1931 | Box 131 \ 1 scan0018 | |
| Overheating problems experienced with 40/50's models, particularly during climbs and in hot weather. | 1st Sep 1931 | Box 131 \ 1 scan0019 | |
| Persistent water boiling issues in the 20/25 and 25-EX car models. | 1st Sep 1931 | Box 131 \ 1 scan0020 | |
| Experimental work on improving car cooling systems by modifying radiator tubes. | 2nd Sep 1931 | Box 131 \ 1 scan0021 | |
| Engine boiling issues and potential improvements to the cooling system tubes. | 1st Sep 1931 | Box 131 \ 1 scan0022 | |
| Phantom II cooling tests, specifically analyzing air temperature rise through the radiator and bonnet ventilation. | 7th Sep 1931 | Box 131 \ 1 scan0023 | |
| Graph plotting the rise in air temperature through a radiator matrix against road speed for chassis 19 EX. | 16th Sep 1931 | Box 131 \ 1 scan0024 | |
| Graphs comparing under-bonnet air pressure for plain versus louvered bonnets at various road speeds and gears. | 16th Sep 1931 | Box 131 \ 1 scan0025 | |
| P.2 cooling tests, concerning air pressure under a bonnet fitted with flip-flap shutters. | 19th Sep 1931 | Box 131 \ 1 scan0026 | |
| Set of graphs showing air pressure under the bonnet at various road speeds for Chassis 20 EX. | 18th Sep 1931 | Box 131 \ 1 scan0027 | |
| Phantom II cooling tests comparing different hexagonal matrix radiator tubes and the effects of ventilation. | 30th Sep 1931 | Box 131 \ 1 scan0028 | |
| High air temperatures recorded under the floorboards near the pedals, emphasising the need for improved ventilation. | 1st Sep 1931 | Box 131 \ 1 scan0029 | |
| Graph from cooling tests comparing air temperature rise across the radiator and to the floorboards, with the bonnet on versus off. | 23th Sep 1931 | Box 131 \ 1 scan0030 | |
| Graph comparing air temperature rise during cooling tests with the bonnet on and off. | 23th Sep 1931 | Box 131 \ 1 scan0031 | |
| Effectiveness of bonnet shutters versus louvres for engine cooling. | 1st Oct 1931 | Box 131 \ 1 scan0032 | |
| Engine overheating case caused by blocked water passages in the cylinder block. | 5th Oct 1931 | Box 131 \ 1 scan0033 | |
| Technical note on engine over-heating at slow speeds due to excessive water pump rotor clearance. | 1st Dec 1931 | Box 131 \ 1 scan0034 | |
| On a car's water overheating issue, tracing it to excessive clearance in the water pump and proposing new limits. | 31th Dec 1931 | Box 131 \ 1 scan0035 | |
| Proposed water pump modifications for the 20/25 engine to address a boiling issue. | 11th Jan 1932 | Box 131 \ 1 scan0036 | |
| How to respond to a customer's concern about engine boiling in a Phantom II car. | 19th Feb 1932 | Box 131 \ 1 scan0037 | |
| Phantom II overheating issue, recommending the latest radiator and a louvered bonnet for a car allotted to Baron von Boecklin. | 20th Feb 1932 | Box 131 \ 1 scan0038 | |
| Letter discussing a customer's overheating car in Jamaica and a proposal to fit an experimental radiator. | 19th Oct 1932 | Box 131 \ 1 scan0039 | |
| Follow-up letter requesting a reply and a cost estimate for changing radiators. | 26th Oct 1932 | Box 131 \ 1 scan0040 | |
| Overheating complaints and recommending the use of Harrison type radiator matrices as a solution. | 26th Oct 1932 | Box 131 \ 1 scan0041 | |
| Letter from Sèvres to Derby regarding a customer complaint about overheating in chassis 116-GN. | 18th Oct 1932 | Box 131 \ 1 scan0042 | |
| Confirming that the subject of 'Overheating Troubles' will be put on the agenda for an upcoming conference. | 27th Oct 1932 | Box 131 \ 1 scan0043 | |
| Solutions for high oil temperature in the Peregrine engine, suggesting sump modifications and extra cooling. | 7th Nov 1932 | Box 131 \ 1 scan0044 | |
| Anticipated availability of a radiator for Baron de la Graviere. | 12th Nov 1932 | Box 131 \ 1 scan0045 | |
| High oil temperature in the Peregrine engine and proposed low-cost cooling solutions. | 9th Dec 1932 | Box 131 \ 1 scan0046 | |
| Proposed modifications to the Peregrine engine crankcase to increase oil capacity and improve cooling. | 13th Dec 1932 | Box 131 \ 1 scan0047 | |
| Letter from Lendrum & Hartman Ltd to W.A. Robotham regarding a misunderstanding over the collection of a Buick Oil Cooler. | 1st Feb 1933 | Box 131 \ 1 scan0048 | |
| Request to Lendrum & Hartman Ltd for a Buick oil cooler to conduct experimental tests on its efficiency. | 1st Feb 1933 | Box 131 \ 1 scan0049 | |
| Letter to Clayton Dewandre Comp, Ltd. inquiring about using their steel wire wound radiator tubes for an oil cooler. | 1st Feb 1933 | Box 131 \ 1 scan0050 | |
| Telegram cancelling a previous message and confirming the dispatch of an oil cooler. | 3rd Feb 1938 | Box 131 \ 1 scan0051 | |
| Letter from Lendrum & Hartman Ltd acknowledging a letter from W. A. Robotham and the receipt of an Oil Cooler. | 2nd Feb 1933 | Box 131 \ 1 scan0052 | |
| Letter from Lendrum & Hartman Ltd regarding the urgent delivery of a Buick Oil Temperature Regulator. | 2nd Feb 1933 | Box 131 \ 1 scan0053 | |
| Telegram requesting further details regarding correspondence about an oil cooler. | 1st Feb 1933 | Box 131 \ 1 scan0054 | |
| Telegram cancelling the dispatch of an oil cooler to Albemarle Street. | 1st Jan 1933 | Box 131 \ 1 scan0055 | |
| Letter thanking Mr. Cuthbert of Messrs Lendrum & Hartman Ltd for the prompt despatch of an oil cooler. | 3rd Feb 1933 | Box 131 \ 1 scan0056 | |
| Letter from Clayton Dewandre Co. Ltd. discussing the development of 'Clayton-Still' Wire Wound Tubes for an Oil Cooler. | 4th Feb 1933 | Box 131 \ 1 scan0057 | |
| Letter to Messrs Clayton & Dewandre Ltd regarding particulars of an oil cooler fitted to a Buick. | 10th Feb 1933 | Box 131 \ 1 scan0058 | |
| Data sheet specifying the performance parameters for an oil cooler. | 11th Feb 1933 | Box 131 \ 1 scan0059 | |
| Diagrammatic views of an oil cooler tested, showing matrix, side, and end perspectives. | 11th Feb 1933 | Box 131 \ 1 scan0060 | |
| Correspondence regarding a new type radiator fitted to chassis 116-GN for Baron de la Graviere. | 16th Feb 1933 | Box 131 \ 1 scan0061 | |
| The testing of a Buick oil cooler on a Peregrine No. 3 engine unit. | 17th Feb 1933 | Box 131 \ 1 scan0062 | |
| Test results and notes for an oil cooler's performance under various conditions. | 17th Feb 1933 | Box 131 \ 1 scan0063 | |
| Data table from 'Test (3)' detailing flow rates, temperatures, and heat extraction for a cooler and by-pass system. | 17th Feb 1933 | Box 131 \ 1 scan0064 | |
| Particulars of a cooler tested, detailing its construction, dimensions, and weight. | 17th Mar 1932 | Box 131 \ 1 scan0065 | |
| Photograph showing the interior of a cooler and its radiator matrix. | 17th Mar 1932 | Box 131 \ 1 scan0066 | |
| Photograph showing two sections of a cooler. | 17th Feb 1933 | Box 131 \ 1 scan0067 | |
| Diagrammatic views of a tested oil cooler, showing its matrix, side, and end views. | 17th Feb 1933 | Box 131 \ 1 scan0068 | |
| Characteristic curve graph for a cooler, plotting heat extraction against cooler flow. | 21th Feb 1933 | Box 131 \ 1 scan0069 | |
| Letter to Mr. G.M. Maclure requesting information on maximum engine oil temperatures in Riley cars and discussing repairs for a crashed car. | 21th Feb 1933 | Box 131 \ 1 scan0070 | |
| The overheating of Peregrine engine oil, discussing heat sources and potential reduction methods. | 13th May 1933 | Box 131 \ 1 scan0071 | |
| Analysis of permissible oil temperatures, heat generation, and oil cooling efficiency in relation to engine bearings. | 13th Mar 1934 | Box 131 \ 1 scan0072 | |
| Analysis of heat dissipation from plain and ribbed oil sumps at various speeds. | 15th May 1933 | Box 131 \ 1 scan0073 | |
| Report discussing oil turbulence, reduced oil pressure, and a performance comparison with a Bensport model. | 13th Mar 1935 | Box 131 \ 1 scan0074 | |
| Comparison of engine heat characteristics and an analysis of subsidiary oil cooler designs for 'Bensport' and 'Peregrine' models. | 15th Feb 1933 | Box 131 \ 1 scan0075 | |
| Summary of findings on engine oil cooling methods, consumption, and related component performance. | 15th Feb 1933 | Box 131 \ 1 scan0076 | |
| Index page listing drawings and tests related to engine oil pressure, consumption, bearings, and temperatures. | 8th Feb 1933 | Box 131 \ 1 scan0077 | |
| Diagram of an oil tank arrangement used in measuring heat flow to oil on Peregrine II engines, units 3 and 4. | 8th Feb 1933 | Box 131 \ 1 scan0078 | |
| Graph plotting heat dissipated to a cooler against oil discharge through bearings for a 6-cylinder Falcon engine unit. | 8th Feb 1933 | Box 131 \ 1 scan0079 | |
| Graph detailing the results of running temperature tests on white metal bearings, plotting temperature against breaking load. | 8th Feb 1933 | Box 131 \ 1 scan0080 | |
| Photograph showing the internal view of an engine crankcase and oil pipe. | 8th Feb 1933 | Box 131 \ 1 scan0081 | |
| Two graphs showing oil consumption for a 40/50 HP Silver Ghost engine and heat generation in a Peregrine oil pump. | 8th Feb 1933 | Box 131 \ 1 scan0082 | |
| Table comparing engine bearing oil inlet temperatures under different oil pressure, sump, and radiator conditions. | 8th Feb 1933 | Box 131 \ 1 scan0083 | |
| Two graphs illustrating Peregrine engine oil temperature management and the efficiency of a Potts oil cooler. | 8th Feb 1933 | Box 131 \ 1 scan0084 | |
| Graph comparing the total heat given to oil by the Peregrine engine against two other aircraft engines. | 8th Feb 1933 | Box 131 \ 1 scan0085 | |
| Chart showing temperature readings from a 6-cylinder Falcon test unit against oil discharge. | 8th Feb 1933 | Box 131 \ 1 scan0086 | |
| Set of four graphs comparing oil inlet temperatures against road speed for the Peregrine engine under various conditions. | 27th Mar 1933 | Box 131 \ 1 scan0087 | |
| Letter from The Riley Engine Co. regarding engine bearing and oil temperatures under various conditions. | 27th Mar 1933 | Box 131 \ 1 scan0088 | |
| Requesting the experimental construction of an oil cooler for the Peregrine radiator, based on design LeC.3431. | 29th Mar 1933 | Box 131 \ 1 scan0089 | |
| Overheating of engine oil in the Peregrine engine and the need for an oil cooler. | 29th Mar 1933 | Box 131 \ 1 scan0090 | |
| Page 2 of a report discussing engine cooling, comparing valve types and predicting the widespread adoption of oil coolers. | 29th Mar 1933 | Box 131 \ 1 scan0091 | |
| Bentley oil temperature tests to determine the value of the front timing case as an oil cooler. | 10th Apr 1933 | Box 131 \ 1 scan0092 | |
| 'Heat to Oil' tests carried out on a Phantom II, No. 7 engine. | 21th Apr 1933 | Box 131 \ 1 scan0093 | |
| Data table showing oil temperature and pump delivery test results at various RPMs. | 1st May 1933 | Box 131 \ 1 scan0094 | |
| Follow-up letter regarding customer feedback on a new type of radiator for chassis II6.GN. | 1st May 1933 | Box 131 \ 1 scan0095 | |
| The requirement for an oil cooler on the J.III engine, using data from Peregrine experiments. | 9th May 1933 | Box 131 \ 1 scan0096 | |
| Design of an oil cooler for Peregrine and J.3 engines, featuring Clayton-Still elements within the radiator matrix. | 11th May 1933 | Box 131 \ 1 scan0097 | |
| Proposal for the arrangement of oil cooling elements behind the main water radiator. | 11th May 1933 | Box 131 \ 1 scan0098 | |
| Test results for oil heat rise in a Bentley Unit C.XI engine at various RPMs. | 16th May 1933 | Box 131 \ 1 scan0099 | |
| Requesting the manufacture of a new oil cooler for test beds following issues with overheating. | 19th May 1933 | Box 131 \ 1 scan0100 | |
| Blueprint of an oil cooler for test bed units. | 23th May 1933 | Box 131 \ 1 scan0101 | |
| Comparing the performance and merits of the Clayton Still oil cooler versus the Buick type cooler. | 23th May 1933 | Box 131 \ 1 scan0102 | |
| Graph plotting oil and water temperature against time from a cold engine start at 900 RPM. | 23th May 1933 | Box 131 \ 1 scan0103 | |
| Graph of water and oil temperatures during continuous full throttle running at Brooklands, comparing two different oil cooler types. | 13th Jun 1933 | Box 131 \ 1 scan0104 | |
| Requesting recommendations for a technical question concerning oil coolers. | 13th Jun 1933 | Box 131 \ 1 scan0105 | |
| Request for a ribbed timing case for Bensport to conduct oil temperature tests at Brooklands. | 15th Jun 1933 | Box 131 \ 1 scan0106 | |
| Further tests conducted on the Peregrine engine to reduce the heat given to the oil. | 16th Jun 1933 | Box 131 \ 1 scan0107 | |
| Redesigning a timing case into an oil cooler and comparing oil tests between Bentley and Peregrine engines. | 16th Jun 1933 | Box 131 \ 1 scan0108 | |
| Graph plotting BTHUs per minute against RPM for an oil system under different test conditions. | 16th Jun 1933 | Box 131 \ 1 scan0109 | |
| Graph showing 'Per Heat To Oil' versus RPM for a ribbed sump under various oil return conditions. | 16th Jun 1933 | Box 131 \ 1 scan0110 | |
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