| Description | Date | Identifier | |
| Advertisement for the Harris Léon Laisne automobile, promoting its new tubular chassis with independent suspension. | 2nd Oct 1928 | Box 128 \ 1 scan0049 | |
| French promotional document illustrating the independent front suspension of a vehicle. | 2nd Oct 1928 | Box 128 \ 1 scan0050 | |
| Price list in French for various chassis models and body styles, with specifications and prices in Francs. | 13th Mar 1929 | Box 128 \ 1 scan0051 | |
| The examination of a Straight-Eight Duesenberg chassis. | 13th Mar 1929 | Box 128 \ 1 scan0052 | |
| Technical assessment of a vehicle's chassis, detailing its components, specifications, and observed faults. | 17th Aug 1929 | Box 128 \ 1 scan0053 | |
| Testing of competitor vehicles like Cadillac and Lincoln to find a good eight-cylinder vee engine. | 17th Aug 1929 | Box 128 \ 1 scan0054 | |
| Customer's new Duesenberg, with an offer to test drive it. | 13th Sep 1929 | Box 128 \ 1 scan0055 | |
| Requesting to borrow a Duesenberg car for testing on known roads to Derby. | 14th Sep 1929 | Box 128 \ 1 scan0056 | |
| From Sg to Hs regarding a trial for a Duesenberg car. | 19th Sep 1929 | Box 128 \ 1 scan0057 | |
| Test run and initial performance notes on a Duesenberg chassis. | 13th Sep 1929 | Box 128 \ 1 scan0058 | |
| Competitor's Duesenberg car and arranging a test drive with its owner, Mr. Duveen. | 23th Sep 1929 | Box 128 \ 1 scan0059 | |
| Trial of a Duesenberg car, detailing its engine and induction system. | 1st Oct 1929 | Box 128 \ 1 scan0060 | |
| Technical assessment of a vehicle's mechanical performance, covering engine, exhaust, steering, and suspension. | 1st Oct 1929 | Box 128 \ 1 scan0061 | |
| Road test report analyzing a vehicle's gear, brakes, general performance, and speedometer accuracy. | 1st Oct 1929 | Box 128 \ 1 scan0062 | |
| Summary and analysis of an American sports car, discussing its performance, engine, and vibration issues. | 16th Oct 1929 | Box 128 \ 1 scan0063 | |
| Trial results and impressions of various 8-cylinder vee engines. | 16th Oct 1929 | Box 128 \ 1 scan0064 | |
| Magazine page from 'Omnia' describing the Ceirano S. 150 VVV independent front suspension system. | 1st May 1930 | Box 128 \ 1 scan0065 | |
| Article from the French magazine 'Omnia' discussing the development and benefits of independent wheel suspension systems. | 1st May 1930 | Box 128 \ 1 scan0066 | |
| Article from the magazine 'Omnia' discussing the development and future of independent suspension systems. | 1st May 1930 | Box 128 \ 1 scan0067 | |
| Article on converting petrol engines to run on heavy oil (semi-diesel) using a Bagnulo cylinder head. | 1st Jun 1930 | Box 128 \ 1 scan0068 | |
| Descriptive article with a cross-section diagram of the Morton rapid diesel engine, from the French magazine 'Omnia'. | 1st Jun 1930 | Box 128 \ 1 scan0069 | |
| Technical assessment of a Leon Laisne vehicle's unconventional suspension, steering, and engine. | 11th Nov 1929 | Box 128 \ 1 scan0070 | |
| Continued report on a vehicle's performance, focusing on suspension, steering, and handling characteristics. | 11th Nov 1929 | Box 128 \ 1 scan0071 | |
| Analysis of the Leon Laisne suspension system in comparison to the Lancia system, with notes on the car's steering characteristics. | 16th Nov 1929 | Box 128 \ 1 scan0072 | |
| The disposal of a Citroen car used for Farnsworth suspension tests. | 16th Nov 1929 | Box 128 \ 1 scan0073 | |
| Letter of apology to Mr. Pass of Pass & Joyce Ltd. regarding inconvenience caused by a borrowed 'Marmon' car and an offer to pay for damages. | 19th Jul 1930 | Box 128 \ 1 scan0074 | |
| Letter from Pass and Joyce Ltd. regarding a missed meeting and the cost of fitting new parts to a Marmon car. | 19th Jul 1930 | Box 128 \ 1 scan0075 | |
| Letter to Captain Bowman regarding a potential meeting with India Tyre Co. and trying a Packard. | 19th Jul 1930 | Box 128 \ 1 scan0076 | |
| Letter discussing the acquisition of a Chrysler and the potential for testing other cars for performance data. | 19th Jul 1930 | Box 128 \ 1 scan0077 | |
| Typed memo regarding an attempt to borrow a Packard and a Chrysler car. | 19th Jul 1930 | Box 128 \ 1 scan0078 | |
| Arrangement of a hire car, referencing a Packard and a Chrysler. | 21th Jul 1930 | Box 128 \ 1 scan0079 | |
| Letter from The Car Mart Ltd to W.A. Robotham regarding arrangements with India Tyre and Rubber Company, and the availability of a Packard car. | 21th Jul 1930 | Box 128 \ 1 scan0080 | |
| The second page of a typed letter, concluding with a closing and a signature. | 22th Jul 1930 | Box 128 \ 1 scan0081 | |
| Letter to Captain Bowman of The Car Mart Ltd. regarding a trial of a 'Packard' and a visit from the India Tyre Co. | 22th Jul 1930 | Box 128 \ 1 scan0082 | |
| Letter from Pass and Joyce Ltd. to Mr. W. A. Robotham regarding a letter received and a future meeting. | 15th Aug 1930 | Box 128 \ 1 scan0083 | |
| Letter arranging the loan of a Studebaker car for Mr. Royce's inspection and discussing tyre improvements. | 22th Aug 1930 | Box 128 \ 1 scan0084 | |
| Letter discussing the provision of two special sets of tyres for extended testing on 20 HP and 40/50 models. | 29th Aug 1930 | Box 128 \ 1 scan0085 | |
| Letter to Captain Bowman of The Car Mart Ltd. regarding the evaluation of Studebaker and Graham Page cars. | 29th Aug 1930 | Box 128 \ 1 scan0086 | |
| Letter from The Car Mart Ltd concerning competitor cars, a Studebaker and a Graham Page, and associated costs. | 30th Aug 1930 | Box 128 \ 1 scan0087 | |
| Letter from The Car Mart Ltd. to W.A. Robotham offering a test drive of a new Studebaker. | 18th Sep 1930 | Box 128 \ 1 scan0088 | |
| Letter from coachbuilders Barker & Co. regarding a 16-Cylinder Cadillac demonstration car. | 25th Sep 1930 | Box 128 \ 1 scan0089 | |
| Letter to coachbuilders Barker & Co. regarding arrangements to test competitor vehicles, a Cadillac and a Daimler. | 27th Sep 1930 | Box 128 \ 1 scan0090 | |
| Road test report on the Daimler Fluid Flywheel and Easy Change Box. | 7th Oct 1930 | Box 128 \ 1 scan0091 | |
| Test report on the performance of a fluid flywheel and gearbox, noting issues with overheating, noise, and efficiency loss. | 7th Oct 1930 | Box 128 \ 1 scan0092 | |
| The Maybach Overspeed Gear arrangement and its performance. | 7th Oct 1930 | Box 128 \ 1 scan0093 | |
| Diagrammatic sketch of the Maybach Overspeed mechanism. | 10th Oct 1930 | Box 128 \ 1 scan0094 | |
| Comparative analysis of competitor gearboxes, including Studebaker and Cadillac. | 7th Oct 1930 | Box 128 \ 1 scan0095 | |
| Road test report on a Daimler Double Six 30/40 chassis. | 7th Oct 1930 | Box 128 \ 1 scan0096 | |
| Report page detailing a road test and performance comparison of a 16-cylinder Cadillac. | 17th Oct 1930 | Box 128 \ 1 scan0097 | |
| Performance and noise comparison report between a Phantom II model and a Cadillac. | 7th Oct 1930 | Box 128 \ 1 scan0098 | |
| Performance review of a Cadillac, focusing on cooling, brakes, clutch, and steering. | 17th Oct 1931 | Box 128 \ 1 scan0099 | |
| The performance and specifications of a 12-cylinder Maybach, with comparisons to other vehicles. | 17th Oct 1930 | Box 128 \ 1 scan0100 | |
| Test report on the Harris Leon-Laisne suspension and an analysis of the 8-cylinder Chrysler's frame. | 17th Oct 1930 | Box 128 \ 1 scan0101 | |
| Continued analysis of chassis and body design features from various automobile manufacturers. | 17th Oct 1930 | Box 128 \ 1 scan0102 | |
| Review of competitor technologies including Gallay radiators, chassis design, and the Voisin magnetic relay. | 17th Oct 1930 | Box 128 \ 1 scan0103 | |
| Description of an electromagnetic gear and clutch mechanism with a detailed component diagram. | 7th Oct 1930 | Box 128 \ 1 scan0104 | |
| Summary of trials on twelve-cylinder engines, highlighting issues with noise and suspension. | 7th Oct 1930 | Box 128 \ 1 scan0105 | |
| Letter to Barkers & Co. Ltd. regarding trials of competitor cars and the progress of the 26-EX model. | 9th Oct 1930 | Box 128 \ 1 scan0106 | |
| Notes on a test drive of the new Talbot 90 Long Chassis, considered a potential competitor. | 9th Oct 1930 | Box 128 \ 1 scan0107 | |
| Report comparing a car to a Sunbeam and a Talbot, discussing performance, weight and value. | 4th Aug 1931 | Box 128 \ 1 scan0108 | |
| Car designs, comparing steering controls, materials, and braking systems of competitors. | 4th Aug 1931 | Box 128 \ 1 scan0109 | |
| Providing the specifications of a Citroen car. | 2nd Oct 1931 | Box 128 \ 1 scan0110 | |
| Road test report of 1931 cars, specifically a Chrysler 6 Cylinder and a Morris Isis. | 27th Oct 1931 | Box 128 \ 1 scan0111 | |
| Typewritten report evaluating the performance and characteristics of a car. | 27th Oct 1931 | Box 128 \ 1 scan0112 | |
| Detailed cross-sectional diagram of a vehicle transmission with numbered components. | 31th Oct 1931 | Box 128 \ 1 scan0113 | |
| Interesting features from the 1931 Motor Show, focusing on engine mounting. | 31th Oct 1931 | Box 128 \ 1 scan0114 | |
| Blueprint diagram of the Plymouth engine's front and rear mounting system. | 31th Oct 1931 | Box 128 \ 1 scan0115 | |
| Gearbox improvements and steering damping methods observed on competitor vehicles. | 31th Oct 1931 | Box 128 \ 1 scan0116 | |
| Automotive design features including shackles, cooling systems, radiators, and frames. | 31th Oct 1931 | Box 128 \ 1 scan0117 | |
| Blueprint comparing four different designs of flexible spring shackles. | 31th Oct 1931 | Box 128 \ 1 scan0118 | |
| Front bumper design, radiator mounting, and an in-depth analysis of brake drum materials and construction. | 31th Oct 1931 | Box 128 \ 1 scan0119 | |
| Material specifications for brake drums and liners, and notes on shock dampers. | 31th Oct 1931 | Box 128 \ 1 scan0120 | |
| Technical drawing of a Hispano front brake drum, specifying materials and dimensions. | 31th Oct 1931 | Box 128 \ 1 scan0121 | |
| Report page discussing shock dampers, ignition systems, and induction systems with a diagram. | 31th Oct 1931 | Box 128 \ 1 scan0122 | |
| Test run report and general impressions on the Hillman Wizard '75' car. | 31th Oct 1931 | Box 128 \ 1 scan0123 | |
| Performance review and comparison of a vehicle's steering, braking, and road performance against a competitor, the Wizard 75. | 31th Oct 1931 | Box 128 \ 1 scan0124 | |
| Note comparing the performance and weight of a 20/25 HP chassis against the Hillman Wizard car. | 31th Oct 1931 | Box 128 \ 1 scan0125 | |
| Acquisition and analysis of a silencer from a Studebaker car. | 3rd Nov 1931 | Box 128 \ 1 scan0126 | |
| Confirming arrangements are being made for cars to be available for a trial. | 17th Dec 1931 | Box 128 \ 1 scan0127 | |
| Letter arranging for various competitor cars to be available for viewing at different showrooms. | 18th Dec 1931 | Box 128 \ 1 scan0128 | |
| Arrangements to acquire and test competitor vehicles, specifically a Lanchester and a Fiat, against their own 25 HP cars. | 8th Jan 1932 | Box 128 \ 1 scan0129 | |
| 'Sg.' to 'Hs.' regarding a letter received from an owner of a two-litre 'Ballot' car. | 15th Jan 1932 | Box 128 \ 1 scan0130 | |
| Copy of a letter from Mr. H.W.R. Pantlin regarding his experience with a two-litre 'Ballot' car. | 13th Jan 1932 | Box 128 \ 1 scan0131 | |
| Letter from the Managing Director arranging an inspection of a two-litre 'Ballot' car. | 15th Jan 1932 | Box 128 \ 1 scan0132 | |
| Poor performance of a two-litre 'Ballot' car and arranging a test drive. | 20th Jan 1932 | Box 128 \ 1 scan0133 | |
| From Sg. to Hs. regarding a Two Litre 'Ballot' Car and correspondence with Mr. Pantlin. | 21th Jan 1932 | Box 128 \ 1 scan0134 | |
| Letter to H.A.R. Pantlin confirming an appointment for a car demonstration with a representative, Mr. Grylls. | 21th Jan 1932 | Box 128 \ 1 scan0135 | |
| Comparative test report on various sports cars, with detailed engine performance data for an Alfa Romeo. | 21th Jan 1932 | Box 128 \ 1 scan0136 | |
| Comparative analysis of vehicle performance, discussing power-to-weight ratios, acceleration, and luxury across different models. | 21th Jan 1932 | Box 128 \ 1 scan0137 | |
| Performance and comparison report on a competitor's 'Two Litre Ballot' car. | 25th Jan 1932 | Box 128 \ 1 scan0138 | |
| Test drive report and critique of the 20 HP Alvis Speed Model. | 30th May 1932 | Box 128 \ 1 scan0139 | |
| Technical review and comparison of a car's performance, focusing on steering, brakes, and body. | 30th May 1932 | Box 128 \ 1 scan0140 | |
| Road test report and specification summary for an Alvis 'Speed' Twenty car. | 24th May 1932 | Box 128 \ 1 scan0141 | |
| Road test report detailing the performance of a vehicle's engine, steering, gearbox, and brakes. | 24th May 1932 | Box 128 \ 1 scan0142 | |
| Report comparing an Alvis car to a proposed Bentley, recommending that the Derby factory test the vehicle. | 7th Dec 1932 | Box 128 \ 1 scan0143 | |
| Trial run report and comparison of a Thrupp & Maberly four-door saloon on an Alvis Speed Twenty chassis. | 7th Dec 1932 | Box 128 \ 1 scan0144 | |
| Road test report detailing vehicle performance, comfort, handling characteristics, and pricing information. | 7th Dec 1932 | Box 128 \ 1 scan0145 | |
| Performance review comparing a 2.5 litre engine with a larger 3.6 litre engine. | 7th Dec 1932 | Box 128 \ 1 scan0146 | |
| Letter from the Experimental Department requesting to test drive competitor cars with automatic and synchromesh gearboxes. | 1st Sep 1933 | Box 128 \ 1 scan0147 | |
| Letter from the Experimental Dept. to Barker & Co concerning a Reo road test and an Alvis trial. | 5th Sep 1933 | Box 128 \ 1 scan0148 | |
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