| Description | Date | Identifier | |
| Letter from Rolls-Royce of America to E.W. Hives in Derby, following up on queries about the 20HP car's performance and handling. | 31th Aug 1928 | Box 113 \ 2 scan0139 | |
| List of topics covering engine mounts, gauges, fabrics, and tests for various car models. | 20th Sep 1928 | Box 113 \ 2 scan0140 | |
| Performance comparison of Mr. Royce's 20 HP car against a Buick and various Chrysler models. | 20th Sep 1928 | Box 113 \ 2 scan0141 | |
| From 'R' considering four potential solutions to the problem of increased acceleration in cars. | 16th Oct 1928 | Box 113 \ 2 scan0142 | |
| Power increase for the 'CHINA' 25 HP engine, covering timing, valve sizes, materials and pipe dimensions. | 4th Nov 1929 | Box 113 \ 2 scan0143 | |
| Typed memorandum detailing proposed modifications to various engine components. | 4th Nov 1929 | Box 113 \ 2 scan0144 | |
| Methods to improve vehicle acceleration through engine power and gearbox modifications. | 7th Nov 1928 | Box 113 \ 2 scan0145 | |
| Technical discussion on an advanced epicyclic gearbox unit compared to existing systems. | 29th Nov 1928 | Box 113 \ 2 scan0146 | |
| Secret internal memo concerning experimentation on accelerations. | 29th Nov 1928 | Box 113 \ 2 scan0147 | |
| Performance comparison memo for the 20 HP engine, detailing the power increase from a turbulent head versus the standard compression. | 26th Apr 1929 | Box 113 \ 2 scan0148 | |
| Comparative analysis of power and road performance for a modified 20 HP engine with an increased bore. | 27th Apr 1929 | Box 113 \ 2 scan0149 | |
| Performance comparison report on road tests and acceleration for various car models, including a Stanton Hill test analysis. | 27th Apr 1929 | Box 113 \ 2 scan0150 | |
| Performance tests, comparing speedometer readings and power curves for different car models. | 27th Apr 1929 | Box 113 \ 2 scan0151 | |
| Comparison table of specifications and performance data for various car models. | 27th Apr 1929 | Box 113 \ 2 scan0152 | |
| Graph comparing the top gear acceleration performance of various car models. | 27th Apr 1929 | Box 113 \ 2 scan0153 | |
| Performance graph of B.HP at the road wheels vs. Engine R.P.M. for various 20 HP engine configurations. | 29th May 1929 | Box 113 \ 2 scan0154 | |
| Comparative performance test report between the 19-EX and a standard Phantom chassis. | 29th May 1929 | Box 113 \ 2 scan0155 | |
| Tests to determine the fastest method for climbing Ticknall Hill in a 10-EX vehicle, with comparisons to other cars. | 22th Aug 1929 | Box 113 \ 2 scan0156 | |
| Report from Paris comparing the acceleration of American versus British chassis. | 26th Oct 1929 | Box 113 \ 2 scan0157 | |
| Comparative tests of 11/50 and 12/50 rear axle gear ratios for 25 HP high compression cars. | 7th Feb 1930 | Box 113 \ 2 scan0158 | |
| Comparison report on 12/50 and 11/50 axle ratios with hill climb test results and recommendations. | 7th Feb 1930 | Box 113 \ 2 scan0159 | |
| 'TEL' acceleration and deceleration recorder. | 11th Nov 1930 | Box 113 \ 2 scan0160 | |
| Letter from Hasler Telegraph Works regarding their 'TEL' Acceleration & Deceleration Recorder instrument. | 11th Nov 1930 | Box 113 \ 2 scan0161 | |
| Descriptive document for the 'TEL' Acceleration and Braking Recorder, outlining its purpose and mechanical operation. | 11th Nov 1930 | Box 113 \ 2 scan0162 | |
| Graph illustrating the movement of a pointer and stylus, plotting the graduation of a dial against running time in seconds. | 11th Nov 1930 | Box 113 \ 2 scan0163 | |
| Page describing the function of a recording stylus and diagram roll for a measuring instrument. | 11th Nov 1930 | Box 113 \ 2 scan0164 | |
| Photograph and dimensional drawings of a tachograph instrument. | 11th Nov 1930 | Box 113 \ 2 scan0165 | |
| Page 3 of a document detailing the operation and specifications of a recording instrument and a 'TEL' Accelerometer. | 11th Nov 1930 | Box 113 \ 2 scan0166 | |
| Photograph and reversed text describing a 'Tapley' Gradometer test rig attached to a car. | 11th Nov 1930 | Box 113 \ 2 scan0167 | |
| Page explaining the function and data interpretation of a fifth wheel drive and accelerometer for vehicle testing. | 11th Nov 1930 | Box 113 \ 2 scan0168 | |
| Page explaining the methodology for measuring vehicle speed and acceleration over specific time periods. | 11th Nov 1930 | Box 113 \ 2 scan0169 | |
| Analysis of vehicle acceleration and braking performance calculations based on a speed diagram. | 11th Nov 1930 | Box 113 \ 2 scan0170 | |
| Explanation of a diagram showing speed and braking measurements over sequential periods. | 11th Nov 1930 | Box 113 \ 2 scan0171 | |
| Analysis of a braking diagram, summarizing speed, distance, time, and deceleration. | 11th Nov 1930 | Box 113 \ 2 scan0172 | |
| Remarks on interpreting diagram data for vehicle speed and acceleration over measurement periods. | 11th Nov 1930 | Box 113 \ 2 scan0173 | |
| Conversion table of speed (km/h or mph) to distance travelled per 1/2 second (metres or feet). | 11th Nov 1930 | Box 113 \ 2 scan0174 | |
| Technical graph, labeled Fig. 5, showing a plotted curve on a grid with various annotations and measurements. | 21th Nov 1931 | Box 113 \ 2 scan0175 | |
| Comparison of acceleration performance and weight for car models 18-GIV and 14-GIV. | 21th Nov 1931 | Box 113 \ 2 scan0176 | |
| Consumption and acceleration tests on a semi-expanding carburetter using different needles. | 7th Nov 1932 | Box 113 \ 2 scan0177 | |
| Proposal to modify the air valve, needle, and diffuser to improve mixture control and fuel consumption. | 29th Jun 1933 | Box 113 \ 2 scan0178 | |
| Acceleration test results for vehicle 27-EX on Shardlow Road. | 29th Jun 1933 | Box 113 \ 2 scan0179 | |
| Comparison of mean way acceleration times for vehicles 25-EX, 19-EX, and 27-EX. | 8th Aug 1933 | Box 113 \ 2 scan0180 | |
| Acceleration performance test data for a Bentley with different axle configurations and settings. | 21th Aug 1933 | Box 113 \ 2 scan0181 | |
| Requesting performance figures for a production model, specifically on braking, acceleration with a 10/41 axle ratio, and compression ratio. | 25th Sep 1933 | Box 113 \ 2 scan0182 | |
| Providing acceleration performance figures for a Bentley 1.B.IV saloon car. | 26th Sep 1933 | Box 113 \ 2 scan0183 | |
| Acknowledging receipt of Bentley performance figures and anticipating further data on braking. | 27th Sep 1933 | Box 113 \ 2 scan0184 | |
| Speedometer accuracy and acceleration test results for an Essex Terraplane. | 30th Sep 1933 | Box 113 \ 2 scan0185 | |
| Performance tests on an Essex Terraplane car. | 13th Oct 1933 | Box 113 \ 2 scan0186 | |
| Comparison of acceleration figures for a 3 1/2 litre Bentley against an Alvis 20, Talbot 105, and Essex Terraplane. | 13th Oct 1933 | Box 113 \ 2 scan0187 | |
| Urgent request for a comparison of acceleration speeds between the 20 HP, early 20/25 HP, and present 20/25 HP models. | 27th Oct 1933 | Box 113 \ 2 scan0188 | |
| Attaching acceleration curves for the original 20 HP, early 20/25 HP, and present standard 20/25 HP car models. | 30th Oct 1933 | Box 113 \ 2 scan0189 | |
| Comparative acceleration graph plotting car speed against time for three vehicle models. | 30th Oct 1933 | Box 113 \ 2 scan0190 | |
| Performance and acceleration figures comparing a Standard Carburettor with a New Type Carburettor. | 13th Feb 1934 | Box 113 \ 2 scan0191 | |
| Issues with an inadequate throttle spring on the Phantom III and introducing a stronger replacement. | 19th Oct 1936 | Box 113 \ 2 scan0192 | |
| Showing acceleration figures for a 3 1/2 Litre Bentley. | 15th Mar 1937 | Box 113 \ 2 scan0193 | |
| Acceleration tests conducted on a vehicle before and after altering the axle ratio. | 28th Mar 1938 | Box 113 \ 2 scan0194 | |
| Proposal for a new type of lock to prevent car theft by securing the change speed lever. | 12th May 1919 | Box 113 \ 3 scan0001 | |
| Suggestions for car anti-theft locks, focusing on a steering lock combined with a switch. | 12th May 1919 | Box 113 \ 3 scan0002 | |
| Provisional specification for an anti-theft device by locking the transmission. | 26th Jun 1919 | Box 113 \ 3 scan0003 | |
| Oilless bearings, anti-rattling bonnet packing, and thief-proofing measures. | 2nd Dec 1919 | Box 113 \ 3 scan0004 | |
| Car theft prevention and a detailed analysis of various wheel types, including wire, disc, and wood. | 31th Aug 1920 | Box 113 \ 3 scan0005 | |
| Ignition locks and new instrument board fittings. | 31th Aug 1920 | Box 113 \ 3 scan0006 | |
| Redesigning ignition locks and considering quotations for electrical equipment from mass producers versus in-house manufacturing. | 19th Nov 1920 | Box 113 \ 3 scan0007 | |
| Policy for standardising accessories and the instrument board for the Goshawk 11 chassis. | 30th Dec 1921 | Box 113 \ 3 scan0008 | |
| Standard accessories for the Goshawk II chassis and the standardization of the instrument board. | 7th Jan 1922 | Box 113 \ 3 scan0009 | |
| Standardising accessories, specifically the speedometer and electrical system, for the Goshawk 11 car. | 9th Jan 1922 | Box 113 \ 3 scan0010 | |
| Requesting prices to standardise the make of Speedometer and Clock for the Goshawk 11 engine. | 1st Jan 1922 | Box 113 \ 3 scan0011 | |
| Decisions made on various vehicle accessories. | 10th Jan 1922 | Box 113 \ 3 scan0012 | |
| Handling correspondence for accessories, returning horn fittings, and testing a new petrol filler. | 14th Feb 1922 | Box 113 \ 3 scan0013 | |
| Query regarding a new arrangement for the tail-light and number plate on the Goshawk 11 model. | 14th Feb 1922 | Box 113 \ 3 scan0014 | |
| New petrol valve design, comparing it to existing taper taps and recommending a trial. | 24th Feb 1926 | Box 113 \ 3 scan0015 | |
| Need for a more explanatory and up-to-date list of recommended accessories. | 13th Dec 1926 | Box 113 \ 3 scan0016 | |
| Article from 'The Motor' magazine describing a new four-way direction indicator from Lucas. | 22th Feb 1927 | Box 113 \ 3 scan0017 | |
| The proposed position for carrying the jack and pump to avoid enlarging the running-board toolboxes. | 8th Mar 1927 | Box 113 \ 3 scan0018 | |
| Weight of the subframe for the 18-EX car and a query about ordering its accessories. | 20th Oct 1928 | Box 113 \ 3 scan0019 | |
| The arrangement of accessories for car 18.EX, including the instrument board and lighting. | 27th Oct 1928 | Box 113 \ 3 scan0020 | |
| Status report on the supply and fitting of accessories for experimental cars. | 16th Nov 1928 | Box 113 \ 3 scan0021 | |
| Page two of a document detailing the order status for Cobra horns for models 20-EX, 21-EX, 22-EX and 23-EX. | 20th Nov 1928 | Box 113 \ 3 scan0022 | |
| Despatch and procurement of lamps and a trunk for Mr. Royce's car, No. 18-EX. | 20th Nov 1928 | Box 113 \ 3 scan0023 | |
| List of standard and additional accessories for a 20-EX Hooper Enclosed Limousine. | 28th Nov 1928 | Box 113 \ 3 scan0024 | |
| Specifications for accessories on a 19-EX Hooper Sedanca. | 28th Nov 1928 | Box 113 \ 3 scan0025 | |
| Ordering and dispatch of various accessories for a 19-EX Hooper Sedanca vehicle. | 29th Nov 1928 | Box 113 \ 3 scan0026 | |
| Accessories for the 19-EX car, specifically the head and tail lamps. | 29th Nov 1928 | Box 113 \ 3 scan0027 | |
| Supply of various components for a Hooper enclosed limousine. | 30th Nov 1928 | Box 113 \ 3 scan0028 | |
| List of parts delivered to Hoopers, Chelsea, for the Experimental Enclosed Limousine No. 20-EX. | 7th Dec 1928 | Box 113 \ 3 scan0029 | |
| Accessory list for the 21-EX Barker Enclosed Limousine and the 22-EX Hooper Enclosed Landaulet. | 18th Dec 1928 | Box 113 \ 3 scan0030 | |
| Specification list of accessories for a Closed Coupled All Weather Barker model. | 18th Dec 1928 | Box 113 \ 3 scan0031 | |
| Supply and dispatch of accessories for Experimental Sedanca No.19-EX. | 19th Dec 1928 | Box 113 \ 3 scan0032 | |
| Letter detailing the sourcing and dispatch of various car accessories in response to a telegram. | 19th Dec 1928 | Box 113 \ 3 scan0033 | |
| Parts ordered for Chassis No.21-EX and No.22-EX. | 20th Dec 1928 | Box 113 \ 3 scan0034 | |
| Listing parts ordered and to be procured for an Experimental All-weather Car, No.16-G-4. | 20th Dec 1928 | Box 113 \ 3 scan0035 | |
| Letter to Messrs. Hooper & Co. Ltd. confirming the delivery of a Bosch dual wiper for an experimental car. | 9th Jan 1929 | Box 113 \ 3 scan0036 | |
| Letter to Barker & Co. Ltd. confirming the delivery of a Bosch dual wiper for Experimental Limousine No. 21-EX. | 8th Jan 1929 | Box 113 \ 3 scan0037 | |
| Letter to Messrs. Barker & Co. Ltd. regarding the fitting of a wiper and spot lamp to experimental car 16-G-4. | 9th Jan 1929 | Box 113 \ 3 scan0038 | |
| List of accessories despatched for experimental cars. | 15th Jan 1929 | Box 113 \ 3 scan0039 | |
| Confirming the dispatch of a spot lamp and horn to the Carlton Carriage Co. for Open Car No. 23-EX. | 19th Jan 1929 | Box 113 \ 3 scan0040 | |
| Weight of accessories, tools, and bodies for experimental cars 18-EX and 22-EX. | 30th Jan 1929 | Box 113 \ 3 scan0041 | |
| Whether to manufacture electrical accessories in-house or license designs, prompted by the reliability of Bosch products. | 1st Feb 1929 | Box 113 \ 3 scan0042 | |
| Quality and selection of various car accessories. | 6th Mar 1929 | Box 113 \ 3 scan0043 | |
| Potential improvements and alternatives for vehicle lighting systems, including tail lamps, stop lamps, and direction indicators. | 6th Mar 1929 | Box 113 \ 3 scan0044 | |
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