| Description | Date | Identifier | |
| Starting difficulties of the Phantom II's magneto ignition system and recommending a review in favor of twin battery ignition. | 14th Jan 1931 | Box 32 \ 5 Scan087 | |
| The difficulties and risks of starting a Phantom II vehicle using magneto ignition. | 14th Jan 1931 | Box 32 \ 5 Scan088 | |
| Explaining the procedure for starting the car with a low battery and the risks of disconnecting the battery. | 14th Jan 1931 | Box 32 \ 5 Scan089 | |
| Weighing the pros and cons of magneto ignition versus double battery ignition. | 7th Jan 1931 | Box 32 \ 5 Scan090 | |
| Confirming by telegram the future use of double battery ignition, while retaining magnetos for starting the engine. | 20th Jan 1931 | Box 32 \ 5 Scan091 | |
| The tests of a battery ignition contact breaker to ascertain when sparking occurs. | 20th Feb 1931 | Box 32 \ 5 Scan092 | |
| Blueprints and a request for experimental ignition distributors for 20/25 HP and 40/50 HP chassis. | 15th Jun 1931 | Box 32 \ 5 Scan093 | |
| Requesting the fitment of a new cam and H.T. rotor to ignition distributors on specific chassis. | 28th Aug 1931 | Box 32 \ 5 Scan094 | |
| Recommendations for updating the battery ignition system. | 14th Oct 1931 | Box 32 \ 5 Scan095 | |
| List of advantages for an outside primary coil, a reduced capacity condenser, and a lighter contact breaker lever. | 15th Oct 1931 | Box 32 \ 5 Scan096 | |
| List of potential design improvements for an automotive ignition system. | 21th Dec 1931 | Box 32 \ 5 Scan097 | |
| List of improvements made to the battery ignition system. | 21th Dec 1931 | Box 32 \ 5 Scan098 | |
| Proposal to replace the standard magneto ignition with a battery ignition system on the 40/50 HP chassis. | 25th Jan 1932 | Box 32 \ 5 Scan099 | |
| Potential alterations to the Phantom II magneto ignition outfit on the 40/50 model. | 27th Jan 1932 | Box 32 \ 5 Scan100 | |
| Use of voltage regulators and modified dynamos on the Peregrine chassis. | 22th Sep 1932 | Box 32 \ 5 Scan101 | |
| Continued memo about fitting a C.A.V. regulator for experiments to improve the R.R. regulator. | 22th Sep 1932 | Box 32 \ 5 Scan102 | |
| Planning difficulties and news regarding Delage, Buick, and Marmon cars. | 14th Mar 1919 | Box 32 \ 5 Scan103 | |
| Mr. Bijur's advice regarding the Bijur apparatus on later Marmon cars and the potential suitability of the Velie car. | 30th Aug 1920 | Box 32 \ 5 Scan104 | |
| Delivery of Cadillac and Marmon cars, and the logistics of sending an experimental car to America for testing. | 29th Sep 1920 | Box 32 \ 5 Scan105 | |
| Extract from a report detailing various vehicle faults observed in the USA, including issues with a Marmon car. | 4th Oct 1920 | Box 32 \ 5 Scan106 | |
| Letter discussing battery charging issues and generator performance on post-war cars, comparing them to American vehicles. | 23th Oct 1920 | Box 32 \ 5 Scan107 | |
| Letter from Rolls Royce of America regarding difficulties with Lucas generators and requesting replacements from Derby. | 23th Oct 1920 | Box 32 \ 5 Scan108 | |
| Letter from Car Mart Ltd concerning a 'MARMON' car placed on sale on commission. | 26th Oct 1920 | Box 32 \ 5 Scan109 | |
| The acquisition of a Marmon car and an enquiry about a Cadillac. | 29th Oct 1920 | Box 32 \ 5 Scan110 | |
| Extract discussing different methods for dimming headlights, with reference to Buick and Marmon systems. | 6th Nov 1920 | Box 32 \ 5 Scan111 | |
| Proposing a visit to Mr. Royce with either a Marmon or Essex car being unloaded at Liverpool. | 15th Nov 1920 | Box 32 \ 5 Scan112 | |
| Recommendation on whether to retain or dispose of various American car models following testing. | 23th Nov 1920 | Box 32 \ 5 Scan113 | |
| Outlining the plan for testing a newly acquired Marmon car before sending it to Mr. Royce. | 23th Nov 1920 | Box 32 \ 5 Scan114 | |
| Arranging the trial of a Marmon car and requesting a written report for Mr. Royce. | 27th Nov 1920 | Box 32 \ 5 Scan115 | |
| Assessment report on the Marmon Car. | 29th Nov 1920 | Box 32 \ 5 Scan116 | |
| Arranging for a Marmon Car to be sent to Mr. Royce for inspection. | 29th Nov 1920 | Box 32 \ 5 Scan117 | |
| Request to obtain front and rear aluminium number plates for a Marmon car. | 30th Nov 1920 | Box 32 \ 5 Scan118 | |
| Registration and license for a Marmon Car with registration R.5308. | 1st Dec 1920 | Box 32 \ 5 Scan119 | |
| Procurement of two aluminium number plates, R-5308, for a Marmon Car. | 1st Dec 1920 | Box 32 \ 5 Scan120 | |
| Cost of obtaining a one-month license for a Marmon Car. | 2nd Dec 1920 | Box 32 \ 5 Scan121 | |
| Work request to grind a scored cylinder bore from a Marmon car. | 10th Dec 1920 | Box 32 \ 5 Scan122 | |
| The dismantling of a Marmon car engine for repairing a scored cylinder, detailing observations from enclosed photographs. | 11th Dec 1920 | Box 32 \ 5 Scan123 | |
| Evaluation of several American cars (Marmon, Buick, Essex, Dodge) for Mr. Royce. | 11th Dec 1920 | Box 32 \ 5 Scan124 | |
| Test and performance particulars for a Marmon Car. | 16th Dec 1920 | Box 32 \ 5 Scan125 | |
| Vehicle specifications and performance test results sheet, page 2. | 1st Oct 1920 | Box 32 \ 5 Scan126 | |
| Technical specifications and notes for a Marmon Car, including valve, spring, and chassis details. | 16th Dec 1920 | Box 32 \ 5 Scan127 | |
| Performance and test data sheet for a Marmon car, detailing weight, gear ratios, acceleration, and dynamometer results. | 16th Dec 1920 | Box 32 \ 5 Scan128 | |
| Technical data sheet detailing vehicle performance specifications including braking, engine timing, suspension, and steering. | 11th Feb 1919 | Box 32 \ 5 Scan129 | |
| Specifications and spring compression data for a Marmon Car. | 24th Dec 1920 | Box 32 \ 5 Scan130 | |
| The loan of an experimental Marmon car for joint testing over the Christmas holidays. | 24th Dec 1920 | Box 32 \ 5 Scan131 | |
| From DA to Mr Warwick giving a review of a Marmon car after a test drive. | 3rd Jan 1921 | Box 32 \ 5 Scan132 | |
| Continuation of a test report on a car's braking, clutch, fuel consumption, and engine performance. | 3rd Jan 1921 | Box 32 \ 5 Scan133 | |
| Continued report on a car's performance, commenting on engine noise, body comfort, and features. | 1st Jul 1921 | Box 32 \ 5 Scan134 | |
| Re-heating of the carburation system for the 40/50 HP chassis. | 3rd Jan 1921 | Box 32 \ 5 Scan135 | |
| Return of a 'Marmon' car and its exchange for an 'Essex' car. | 17th Jan 1921 | Box 32 \ 5 Scan136 | |
| Comparing 'Marmon' worm and nut steering with the company's own central points steering system. | 24th Jan 1921 | Box 32 \ 5 Scan137 | |
| Continued memo discussing steering system design, focusing on pivots, thrusts, and the impact of wire versus disc wheels. | 24th Jan 1921 | Box 32 \ 5 Scan138 | |
| Letter providing the particulars of an Essex car in order to obtain a licence. | 25th Jan 1921 | Box 32 \ 5 Scan139 | |
| The Marmon car, comparing its engine power, compression, and gear ratios to a standard model. | 2nd Feb 1921 | Box 32 \ 5 Scan140 | |
| Performance and specification report for a Marmon car, detailing weight, gear ratios, fuel consumption, acceleration, and dynamometer test results. | 16th Dec 1920 | Box 32 \ 5 Scan141 | |
| Vehicle performance evaluation report covering clutch, brakes, engine, suspension, ignition, and steering. | 16th Dec 1920 | Box 32 \ 5 Scan142 | |
| Specification sheet detailing friction, transmission, valve, spring, and chassis frame particulars. | 8th Feb 1921 | Box 32 \ 5 Scan143 | |
| Comparison of speedometer readings and acceleration tests between R-R, Marmon, and 2.EX cars. | 8th Feb 1921 | Box 32 \ 5 Scan144 | |
| Performance test data in tabular format for an 'EX Car' and a 'Marion Car'. | 9th Feb 1921 | Box 32 \ 5 Scan145 | |
| Starter gear failure on a Marmon car and a comparison of its Bendix pinion system. | 17th Mar 1921 | Box 32 \ 5 Scan146 | |
| To Mr. Hives comparing the slowest speeds of various cars and the performance of a Marmon tyre pump. | 17th Mar 1921 | Box 32 \ 5 Scan147 | |
| Extract from a report on a visit regarding electrical matters, specifically the design and testing of a Goshawk II dynamo. | 31th Mar 1921 | Box 32 \ 5 Scan148 | |
| Specification sheet detailing the weights and dimensions of a 'Marmon' clutch and its components. | 6th Apr 1921 | Box 32 \ 5 Scan149 | |
| The specifications of the springs in a Marmon car's side steering rod. | 9th Apr 1921 | Box 32 \ 5 Scan150 | |
| Requesting the removal of a Marmon car dynamo to obtain particulars for design purposes. | 18th Apr 1921 | Box 32 \ 5 Scan151 | |
| Request for 3 pairs of cylinder head joints for a Marmon Car. | 18th Apr 1921 | Box 32 \ 5 Scan152 | |
| Breakdown of the weight of a Marmon car by front and rear axle. | 22th Jul 1930 | Box 32 \ 5 Scan153 | |
| Inter-office correspondence regarding the dispatch of cylinder head joints for a Marmon car. | 3rd May 1921 | Box 32 \ 5 Scan154 | |
| Horsepower curves of foreign cars, specifically the Buick and Marmon, and plans for re-testing. | 20th May 1921 | Box 32 \ 5 Scan155 | |
| Request to obtain parts for a 'Marion' car from the R.R. Springfield facility. | 27th May 1921 | Box 32 \ 5 Scan156 | |
| Carburation improvements and performance results for the Goshawk I engine. | 31th May 1921 | Box 32 \ 5 Scan157 | |
| Testing the Goshawk I engine with different carburetters and induction systems. | 31th May 1921 | Box 32 \ 5 Scan158 | |
| Steering wobble issues and the efficiency of the Goshawk I exhaust system. | 31th May 1921 | Box 32 \ 5 Scan159 | |
| From 'E' to 'HS' seeking clarification on mean pressure curves for foreign cars. | 1st May 1921 | Box 32 \ 5 Scan160 | |
| Explaining the methodology for comparing the Mean Effective Pressure (M.E.P.) of foreign cars with the company's own 40/50 chassis. | 3rd Jun 1921 | Box 32 \ 5 Scan161 | |
| Internal memorandum listing known faults with the electrical equipment on the 40/50 chassis. | 7th Jun 1921 | Box 32 \ 5 Scan162 | |
| Comparison of the reliability and performance of Delco electrical equipment on a Marmon car versus Smith and Lucas systems. | 16th Dec 1928 | Box 32 \ 5 Scan163 | |
| Delays to improvements due to reduced output and the issue of shipping cars with known faults. | 4th Jun 1921 | Box 32 \ 5 Scan164 | |
| Laboratory analysis of a special casting for a Marmon tappet guide. | 4th Jun 1921 | Box 32 \ 5 Scan165 | |
| Clarifying the terminology for horsepower records from two different dynamometers. | 9th Jun 1921 | Box 32 \ 5 Scan166 | |
| The performance of oilless bearings from a Marmon Car and a recommendation to test them on the 40/50 HP model. | 1st Aug 1921 | Box 32 \ 5 Scan167 | |
| Proposing a new crankshaft design for a 14-HP six-cylinder engine, referencing a Marmon crankshaft. | 29th Aug 1921 | Box 32 \ 5 Scan168 | |
| Mileage recorder on a Marmon car being tested and comparing its electrical units to the 40/50 chassis. | 30th Aug 1921 | Box 32 \ 5 Scan169 | |
| Letter from the American branch regarding an ignition switch and the shipment of a Delco switch box. | 31th Aug 1921 | Box 32 \ 5 Scan170 | |
| From CJ to Hs questioning the purpose and necessity of a 10,000-mile test on a Marmon car. | 7th Sep 1921 | Box 32 \ 5 Scan171 | |
| Technical analysis of a Marmon car crankshaft, including bearing measurements and Brinell hardness tests. | 9th Sep 1921 | Box 32 \ 5 Scan172 | |
| The despatch of a switch for the Marmon Car to Mr. Royce. | 16th Sep 1921 | Box 32 \ 5 Scan173 | |
| Laboratory analysis of the chemical composition of a crankshaft from a Marmon Car which wore well. | 21th Sep 1921 | Box 32 \ 5 Scan174 | |
| Analysis of a dismantled Marmon Car crankshaft and bearings, noting the absence of wear. | 23th Sep 1921 | Box 32 \ 5 Scan175 | |
| Pin dimensions, Brinell hardness tests on webs, and a chemical analysis. | 23th Sep 1921 | Box 32 \ 5 Scan176 | |
| Investigation into induction system noise on the Goshawk 11 car. | 11th Oct 1921 | Box 32 \ 5 Scan177 | |
| Blueprint for the Bendix Drive on a Delco S.S. Motor fitted to a Marmon Car. | 10th Oct 1921 | Box 32 \ 5 Scan178 | |
| Design of a Bendix Pinion, comparing it to a version on a Marmon car and considering patent royalties. | 28th Oct 1921 | Box 32 \ 5 Scan179 | |
| Confirmation of a telegram from Royce to Hives regarding discussions on the USA and the Goshawk engine. | 1st Nov 1921 | Box 32 \ 5 Scan180 | |
| Inquiry to Messrs. C.A. Vandervell & Co. Ltd. about the possibility of repairing a faulty 6-volt Willard battery from a Marmon car. | 15th Nov 1921 | Box 32 \ 5 Scan181 | |
| Correspondence from C.A. Vandervell & Co. Ltd. regarding the examination and quotation for a Willard 6-volt battery. | 17th Nov 1921 | Box 32 \ 5 Scan182 | |
| Repair of a faulty 6-volt Willard battery from a Marmon car. | 18th Nov 1921 | Box 32 \ 5 Scan183 | |
| Wiring diagram for a vehicle's electrical system. | 3rd Dec 1921 | Box 32 \ 5 Scan184 | |
| The reverse side of an archival document with a reference number and a date stamp. | 3rd Dec 1921 | Box 32 \ 5 Scan185 | |
| Instructing the despatch of a U.S.A. Willard battery for a Marmon car to the C.A.V. Company. | 28th Nov 1921 | Box 32 \ 5 Scan186 | |
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