| Description | Date | Identifier | |
| Letter detailing the itinerary and mileage for a six-day car journey in Austria. | 30th Jul 1913 | Box 119 \ 3 scan0004 | |
| Test results for closed and louvred bonnets on Broccone Pass, Austria, detailing water loss and temperature readings. | 20th Sep 1912 | Box 119 \ 3 scan0005 | |
| Table recording performance data from two test ascents with different bonnet setups. | 4th Oct 1912 | Box 119 \ 3 scan0006 | |
| Report from Hives on the design and manufacture of louvred bonnets. | 4th Oct 1912 | Box 119 \ 3 scan0007 | |
| Test notes on a louvred bonnet for car 2126, detailing observations on noise and cooling. | 20th Oct 1912 | Box 119 \ 3 scan0008 | |
| Letter from F.H. Royce regarding design modifications for the scuttle dashboard shutters on a London-Edinburgh type car. | 25th Oct 1912 | Box 119 \ 3 scan0009 | |
| Hand-drawn diagram illustrating a practical scheme for operating louvres. | 29th Oct 1912 | Box 119 \ 3 scan0010 | |
| Departmental memo regarding the ventilation of the dashboard. | 29th Oct 1912 | Box 119 \ 3 scan0011 | |
| The ventilation scheme and bonnet louvre construction for Chassis 2100E. | 4th Dec 1912 | Box 119 \ 3 scan0012 | |
| The ventilation scheme for chassis 2100E, questioning the benefit of fitting louvres. | 18th Dec 1912 | Box 119 \ 3 scan0013 | |
| From Mr. Royce with a design recommendation for windows instead of louvres. | 28th Apr 1913 | Box 119 \ 3 scan0014 | |
| Departmental memo regarding an experimental bonnet shutter and a new type of bonnet. | 28th May 1913 | Box 119 \ 3 scan0015 | |
| Necessity of bonnet louvres, including an extract from Mr Royce's opinion on the matter. | 27th Aug 1913 | Box 119 \ 3 scan0016 | |
| Necessity of testing bonnet louvres. | 9th Oct 1913 | Box 119 \ 3 scan0017 | |
| Potential modifications for car number 2127, concerning a shutter bonnet and radiator issues. | 18th Oct 1913 | Box 119 \ 3 scan0018 | |
| Internal inquiry regarding the engine cooling performance of shuttered bonnets versus louvred bonnets. | 31th Oct 1913 | Box 119 \ 3 scan0019 | |
| Internal request for test results comparing shuttered and louvered bonnets for engine cooling, with a handwritten reply. | 3rd Nov 1913 | Box 119 \ 3 scan0020 | |
| Request for a report comparing the cooling effects of shuttered versus louvered bonnets. | 4th Nov 1913 | Box 119 \ 3 scan0021 | |
| Comparative cooling efficiency of shuttered versus louvred bonnets. | 28th Nov 1913 | Box 119 \ 3 scan0022 | |
| Comparative cooling efficiency of a shuttered bonnet versus a louvred bonnet. | 7th Nov 1913 | Box 119 \ 3 scan0023 | |
| Cover page for a document concerning Spanish Trials Cars. | 17th Jun 1913 | Box 119 \ 3 scan0024 | |
| The Experimental Department to report on the cooling efficiency of shuttered bonnets versus louvered types. | 14th Jan 1914 | Box 119 \ 3 scan0025 | |
| Quoting Mr. Hives' report on the comparison between shuttered and louvred bonnets. | 21th Jan 1914 | Box 119 \ 3 scan0026 | |
| Comparative tests and opinions on shuttered bonnets. | 15th Jan 1914 | Box 119 \ 3 scan0027 | |
| Seeking clarification on a contradictory report about the effectiveness of shuttered bonnets. | 23th Jan 1914 | Box 119 \ 3 scan0028 | |
| Further tests and a report on a matter previously explained. | 24th Jan 1914 | Box 119 \ 3 scan0029 | |
| Quoting Hives' remarks regarding shuttered bonnets and the need for further testing. | 24th Jan 1914 | Box 119 \ 3 scan0030 | |
| Internal query regarding the fitting of shuttered bonnets and their heat-transfer effect on floorboards compared to louvred bonnets. | 2nd Feb 1914 | Box 119 \ 3 scan0031 | |
| Effect of shuttered bonnets on the ventilation of floorboards, awaiting test results. | 4th Feb 1914 | Box 119 \ 3 scan0032 | |
| Follow-up memo requesting a reply to a previous enquiry regarding Shuttered Bonnets. | 5th Feb 1914 | Box 119 \ 3 scan0033 | |
| Testing parameters for comparing louvred and shuttered bonnets. | 10th Feb 1914 | Box 119 \ 3 scan0034 | |
| Temperature tests comparing open and closed bonnet shutters, and plain versus louvred bonnets. | 11th Mar 1914 | Box 119 \ 3 scan0035 | |
| Comparison test of water and floorboard temperatures between a plain bonnet and a louvered bonnet. | 12th Mar 1914 | Box 119 \ 3 scan0036 | |
| Tests on the cooling efficiency of shuttered versus louvred bonnets. | 12th Mar 1914 | Box 119 \ 3 scan0037 | |
| Trial of a shuttered bonnet to replace the louvred bonnet for better temperature regulation. | 3rd May 1914 | Box 119 \ 3 scan0038 | |
| Instructions for a new bonnet with double shutters to be fitted to an experimental car. | 28th May 1914 | Box 119 \ 3 scan0039 | |
| The Drawing Office to issue instructions for fitting a universal radiator and shuttered bonnet to a 1926 Experimental chassis. | 29th May 1914 | Box 119 \ 3 scan0040 | |
| Comparative test between double shuttered bonnets and louvred bonnets. | 29th Jun 1914 | Box 119 \ 3 scan0041 | |
| Fitting of louvred bonnets, referencing Mr Royce's aesthetic and noise objections, and comparing test results to shuttered bonnets. | 29th Jun 1914 | Box 119 \ 3 scan0042 | |
| Cooling effectiveness of different bonnet designs, with a direct quote from Mr. Royce. | 3rd Jul 1914 | Box 119 \ 3 scan0043 | |
| Complaints of overheating floorboards and the proposed trial of a double shuttered bonnet. | 3rd Jul 1914 | Box 119 \ 3 scan0044 | |
| Floorboard overheating on Lord Herbert Scott's car and a request for a double shuttered bonnet for experimentation. | 4th Jul 1914 | Box 119 \ 3 scan0045 | |
| Availability of the only Double Shuttered Bonnet, currently fitted to a car in the Experimental Shop. | 6th Jul 1914 | Box 119 \ 3 scan0046 | |
| Use of bonnet shutters to improve cooling for the floor boards and radiator. | 17th Jul 1914 | Box 119 \ 3 scan0047 | |
| Compiling extracts from Mr Royce's criticisms regarding the use of louvred bonnets. | 20th Jul 1914 | Box 119 \ 3 scan0048 | |
| Louvered bonnets making cars run too cool in winter, referencing a comparative test. | 21th Jul 1914 | Box 119 \ 3 scan0049 | |
| Instructions to cut an experimental aperture in the side bonnet plates for chassis No. 1926 and provide a cover plate. | 21th Jul 1914 | Box 119 \ 3 scan0050 | |
| Development and trial of shuttered bonnets, comparing them to louvred bonnets. | 23th Jul 1914 | Box 119 \ 3 scan0051 | |
| Testing of a bonnet with four shutters to potentially replace the louvred type. | 23th Jul 1914 | Box 119 \ 3 scan0052 | |
| To Mr Hives regarding an experiment on shuttered bonnets to be carried out quickly. | 23th Jul 1914 | Box 119 \ 3 scan0053 | |
| Requesting an opinion on the application of the Shuttered Bonnet to various car types. | 24th Jul 1914 | Box 119 \ 3 scan0054 | |
| Requesting final reports on a list of experiments. | 27th Jul 1914 | Box 119 \ 3 scan0055 | |
| Comparative tests of different bonnet types, recommending the four-shuttered bonnet as the new standard to prevent engine overheating. | 30th Jul 1914 | Box 119 \ 3 scan0056 | |
| Engine and cabin cooling, comparing radiator types and bonnet designs to prevent the car boiling and reduce hot floorboards. | 30th Jul 1914 | Box 119 \ 3 scan0057 | |
| Proposal for a more accurate method of measuring floor board temperatures using a radiator test rig. | 30th Jul 1914 | Box 119 \ 3 scan0058 | |
| Test report comparing water and floor board temperatures for different types of bonnets. | 2nd Jul 1914 | Box 119 \ 3 scan0059 | |
| The inefficiency of single shutter bonnets and a trial for a new design with shutters at each end. | 30th Jul 1914 | Box 119 \ 3 scan0060 | |
| Extract regarding the dynamometer testing and comparison of shuttered, louvred, and standard bonnets. | 12th Aug 1914 | Box 119 \ 3 scan0061 | |
| Outlining an agreement for the standardisation of double-shuttered bonnets on standard cars. | 17th Jan 1914 | Box 119 \ 3 scan0062 | |
| The standardisation of double shuttered bonnets for standard cars. | 18th Aug 1914 | Box 119 \ 3 scan0063 | |
| Agreement on the standardisation of four key vehicle components. | 10th Nov 1914 | Box 119 \ 3 scan0064 | |
| Value of air shutters and the ergonomic difficulties of opening and closing the bonnets on various car models. | 3rd Jun 1919 | Box 119 \ 3 scan0065 | |
| Design, cost, and effectiveness of radiator shutters for the 40/50 chassis. | 5th Jun 1919 | Box 119 \ 3 scan0066 | |
| Recommendation to alter bonnet stud handles to make lifting the bonnet easier. | 5th Jun 1919 | Box 119 \ 3 scan0067 | |
| Query regarding the use of bonnet shutters in India to assess whether to discontinue fitting them due to cost and rattling. | 21th Sep 1920 | Box 119 \ 3 scan0068 | |
| Letter from Rolls-Royce of America regarding a request for data on the use of shutters in bonnets. | 7th Oct 1920 | Box 119 \ 3 scan0069 | |
| Letter from Rolls-Royce of America discussing issues with bonnet shutters, recommending they be omitted due to being jammed by paint and rattling. | 19th Oct 1920 | Box 119 \ 3 scan0070 | |
| Standardisation of chassis parts by the deletion of shutters in the bonnet. | 2nd Nov 1920 | Box 119 \ 3 scan0071 | |
| From Rolls-Royce of America discussing the issues with bonnet shutters and recommending their omission. | 19th Oct 1920 | Box 119 \ 3 scan0072 | |
| From Delhi regarding the low number of cars fitted with bonnet shutters. | 18th Jan 1920 | Box 119 \ 3 scan0073 | |
| Cover note for an attached letter from America regarding shutters in bonnets. | 29th Oct 1920 | Box 119 \ 3 scan0074 | |
| Recommendation to delete shutters in bonnets due to infrequent use, rattling, and to improve appearance and save costs. | 1st Nov 1920 | Box 119 \ 3 scan0075 | |
| Extracting a report from Australia concerning bonnet rattles and the suitability of louvred bonnets for post-war cars. | 17th Aug 1921 | Box 119 \ 3 scan0076 | |
| Decision to retain ventilating shutters on bonnets for cars destined for hot countries. | 10th Nov 1921 | Box 119 \ 3 scan0077 | |
| The necessity of ventilation shutters on chassis bonnets for post-war cars used in India. | 15th Oct 1921 | Box 119 \ 3 scan0078 | |
| If louvered bonnets are more effective at preventing overheating than making bonnet shutters larger. | 15th Oct 1921 | Box 119 \ 3 scan0079 | |
| The fitting of ventilating shutters in bonnets for 40/50 HP chassis destined for hot countries. | 15th Nov 1921 | Box 119 \ 3 scan0080 | |
| Standardisation of bonnets without shutters for the 40/50 chassis to reduce rattles, based on feedback from India. | 2nd May 1922 | Box 119 \ 3 scan0081 | |
| Testing ventilation shutters on postwar cars during reliability trials in India. | 8th Apr 1922 | Box 119 \ 3 scan0082 | |
| Effectiveness and design of louvres on the Goshawk and 40/50 models. | 10th Jan 1923 | Box 119 \ 3 scan0083 | |
| Potential solutions to overheating problems in 40/50 and Goshawk engines. | 19th Jan 1923 | Box 119 \ 3 scan0084 | |
| Suggestion to fit zinc blocks or sheets to neutralize water, making peaty and sea-salt water less detrimental. | 10th Aug 1923 | Box 119 \ 3 scan0085 | |
| Outlining eleven points for investigation regarding water boiling issues in 40/50 and Goshawk models. | 10th Aug 1923 | Box 119 \ 3 scan0086 | |
| Engine performance and the Goshawk radiator shutter and by-pass system. | 24th Sep 1924 | Box 119 \ 3 scan0087 | |
| Necessity of fitting ventilating shutters to polished bonnets on 40/50 HP cars to prevent overheating. | 24th Sep 1924 | Box 119 \ 3 scan0088 | |
| Standardisation of bonnet shutters for 'R' Series cars, with exceptions for specific countries. | 31th Aug 1922 | Box 119 \ 3 scan0089 | |
| Recommendation to continue with the present bonnet for the 40/50 'R' series due to issues with water boiling. | 9th Sep 1922 | Box 119 \ 3 scan0090 | |
| History and decisions regarding shutterless bonnets. | 3rd Oct 1924 | Box 119 \ 3 scan0091 | |
| Sending a 5-EX Silver Ghost to Conduit Street to investigate an overheating issue, and carrying a spare bonnet for a 20 HP car. | 17th Jun 1925 | Box 119 \ 3 scan0092 | |
| Modifications to radiator and bonnet proportions, referencing several drawings and a future meeting in Derby. | 2nd Feb 1927 | Box 119 \ 3 scan0093 | |
| The merits and costs of fitting shutters versus permanent louvres on 40/50 HP chassis bonnets to prevent overheating. | 20th Jun 1927 | Box 119 \ 3 scan0094 | |
| Cost, cooling efficiency, and appearance of 40/50 model bonnet shutters and louvres. | 23th Jun 1927 | Box 119 \ 3 scan0095 | |
| Removal of rear shutters on a standard car and its effect on cooling efficiency. | 30th Jun 1927 | Box 119 \ 3 scan0096 | |
| Deletion of rear bonnet shutters for the 40/50 HP model to achieve cost savings. | 5th Jul 1927 | Box 119 \ 3 scan0097 | |
| Deletion of rear shutters and bonnet louvres on Phantom & Goshawk models to improve appearance and reduce costs. | 7th May 1927 | Box 119 \ 3 scan0098 | |
| Deletion of back bonnet shutters and painting procedures for them. | 9th Jul 1927 | Box 119 \ 3 scan0099 | |
| Standardisation proposal for replacing bonnets with shutters with louvred bonnets. | 11th May 1927 | Box 119 \ 3 scan0100 | |
| Questionnaire regarding the implementation of a new part for a chassis. | 1st Oct 1927 | Box 119 \ 3 scan0101 | |
| Requesting the new comparative cost for louvres and shutters after a reduction in production time. | 11th Aug 1927 | Box 119 \ 3 scan0102 | |
| Policy on using louvred bonnets versus bonnet shutters for 40/50 HP cars, especially for tropical climates. | 11th Aug 1927 | Box 119 \ 3 scan0103 | |
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