| Description | Date | Identifier | |
| Instructions to chamfer bolt holes in planet wheels at 30 degrees to remove fraize from drilling and reaming. | 23th Jun 1917 | Box 37 \ 4 scan 154 | |
| 100-hour engine test, detailing experimental parts tested and subsequent component failures. | 19th Jul 1917 | Box 37 \ 4 scan 155 | |
| Condition of various engine components after a test run, including the camshaft, gears, and pistons. | 19th Jul 1917 | Box 37 \ 4 scan 156 | |
| Continued page of a document describing a severe test on a piston. | 21th Jun 1917 | Box 37 \ 4 scan 157 | |
| Instructions for experiments to be incorporated into the 100-hour endurance test of the Experimental Falcon 'B' Engine. | 21th Jun 1917 | Box 37 \ 4 scan 158 | |
| 'Eagle' engine's epicyclic gear floating sun wheel bush scheme, including part numbers and an assembly sketch. | 15th May 1917 | Box 37 \ 4 scan 159 | |
| Chasing an urgent and delayed order for a floating sunwheel bush. | 18th Jun 1917 | Box 37 \ 4 scan 160 | |
| Decision not to fit the X.3047 floating bush in the sunwheel for the Experimental Eagle 'E' Engine. | 23th Jun 1917 | Box 37 \ 4 scan 161 | |
| Chasing a report on the Epicyclic Gear - Floating Sunwheel Bush Scheme. | 9th Jul 1917 | Box 37 \ 4 scan 162 | |
| To Mr. Clark regarding the completion status of the floating sun wheel bush job. | 9th May 1917 | Box 37 \ 4 scan 163 | |
| Instruction sheet noting the fitting of a sun wheel with a floating bush on an epicyclic gear for an experimental engine. | 15th Aug 1917 | Box 37 \ 4 scan 164 | |
| Performance of a floating sun-wheel bush, recommending to continue with the existing method of fixing bushes with round keys. | 1st Oct 1917 | Box 37 \ 4 scan 165 | |
| The experiment for a floating sunwheel bush. | 3rd Jan 1918 | Box 37 \ 4 scan 166 | |
| Order for modified magneto driving pieces for 'Eagle' engines. | 18th May 1917 | Box 37 \ 4 scan 167 | |
| Instructions for incorporating an experiment on more flexible magneto couplings into an engine endurance test. | 22th Jun 1917 | Box 37 \ 4 scan 168 | |
| To Mr. Clark detailing the conversion of a C2 engine into an Eagle 8 type, listing the experimental parts used. | 5th Oct 1917 | Box 37 \ 4 scan 169 | |
| Experiment remarks on thinner plates for magneto driving spindles. | 23th Oct 1917 | Box 37 \ 4 scan 170 | |
| Issues with a new magneto drive, comparing it unfavorably to the previous design. | 24th Oct 1917 | Box 37 \ 4 scan 171 | |
| Use of aluminium versus gun-metal for starter motor brush holders. | 13th Jun 1919 | Box 37 \ 4 scan 172 | |
| Proposed induction system for the Condor engine based on Mr. Royce's instructions. | 22th Feb 1918 | Box 37 \ 4 scan 173 | |
| Instructions concerning an urgent test of a proposed induction system for the Condor engine, comparing it with the Eagle engine's setup. | 26th Apr 1917 | Box 37 \ 4 scan 174 | |
| Performance results of Condor type induction pipes compared to standard pipes and plans for further tests. | 28th Feb 1918 | Box 37 \ 4 scan 175 | |
| Extract detailing the testing of 3-cylinder induction pipes on a six-cylinder Eagle engine. | 1st Mar 1918 | Box 37 \ 4 scan 176 | |
| Potential cracking in new drop-forged rocker levers and the need for an endurance test. | 25th Oct 1918 | Box 38 \ 1 Scan001 | |
| Letter from a supplier regarding the machining and material properties of rocker stampings and forgings. | 22th Oct 1918 | Box 38 \ 1 Scan002 | |
| Letter from Linotype & Machinery Ltd. regarding the supply of special rockers and subsequent modifications to jigs. | 1st Dec 1918 | Box 38 \ 1 Scan003 | |
| Request for a report on the endurance test of valve rocker levers made from new style forgings. | 1st Dec 1918 | Box 38 \ 1 Scan004 | |
| Stating that Linotype valve rocker levers are now standard. | 20th Mar 1919 | Box 38 \ 1 Scan005 | |
| Issues with a sample delivery of Hessbright ball bearings for American engines, requesting an urgent experimental test. | 24th Apr 1918 | Box 38 \ 1 Scan006 | |
| Testing of Hessbright ball bearings for epicyclic gears and the use of steel versus phosphor bronze cages. | 15th Jun 1918 | Box 38 \ 1 Scan007 | |
| Letter discussing sample planet ball bearings sent to Derby for trial, comparing Hess-Bright and Hoffman bearings. | 4th May 1918 | Box 38 \ 1 Scan008 | |
| The handover of American ball bearings for testing upon arrival. | 21th Nov 1918 | Box 38 \ 1 Scan009 | |
| Test report on the performance and failure of Hess-Bright ball bearings for planet wheels after running on an Eagle engine. | 23th Oct 1918 | Box 38 \ 1 Scan010 | |
| The failure of ball bearings used in place of roller bearings on an 'Eagle' Epicyclic Gear. | 24th Oct 1918 | Box 38 \ 1 Scan011 | |
| Bearing endurance testing, the replacement of Hess-Bright bearings, and sending parts to Mr. Royce. | 26th Apr 1917 | Box 38 \ 1 Scan012 | |
| Report concerning the failure of sample Hessbright planet wheel ball bearings for American engines. | 25th Oct 1918 | Box 38 \ 1 Scan013 | |
| Request for balls from a faulty planet wheel bearing to analyze the chromium percentage. | 31th Oct 1918 | Box 38 \ 1 Scan014 | |
| The shipment and testing of planet wheel ball bearings for American engines' epicyclic gears. | 8th Nov 1918 | Box 38 \ 1 Scan015 | |
| Laboratory report on the chemical analysis of a failed Hessbright Bearing from an American Planet Wheel. | 23th Jan 1919 | Box 38 \ 1 Scan016 | |
| Letter regarding an order and testing of standard 35mm ball bearings from the Hess-Bright Manufacturing Co. | 6th Nov 1917 | Box 38 \ 1 Scan017 | |
| List of parts sent from the United States requiring experimental work. | 30th Jan 1920 | Box 38 \ 1 Scan018 | |
| List of parts received from Mr. Olley for inspection and testing. | 4th Mar 1920 | Box 38 \ 1 Scan019 | |
| Extract discussing the sourcing of various car parts proposed to be sent to America. | 7th Jun 1920 | Box 38 \ 1 Scan020 | |
| Two illustrations of a 'Q' Meter, a device for measuring air flow capacity. | 4th Jan 1918 | Box 38 \ 1 Scan021 | |
| Letter from consulting engineer G. J. Gibbs concerning the design and operation of patented air meters. | 19th Nov 1918 | Box 38 \ 1 Scan022 | |
| Inquiry about the accuracy of flow meters used for measuring air supply to internal combustion engines. | 7th Dec 1918 | Box 38 \ 1 Scan023 | |
| Page 2 of a letter inquiring about the supply of meters to measure atmospheric conditions. | 12th Dec 1918 | Box 38 \ 1 Scan024 | |
| Letter from consultant G. J. Gibbs arranging a visit to discuss air and flow meters. | 12th Dec 1918 | Box 38 \ 1 Scan025 | |
| Letter to Mr. G.J. Gibbs confirming a meeting regarding air flow meters. | 16th Dec 1918 | Box 38 \ 1 Scan026 | |
| New D.C. Constant Voltage Generator, suggesting a potential experiment using parts from an old starter motor. | 26th Apr 1917 | Box 38 \ 1 Scan027 | |
| Evaluation of a new system from 'Electrical Review', cautioning against its construction if it is too heavy. | 11th Nov 1918 | Box 38 \ 1 Scan028 | |
| Page from 'The Electrical Review' detailing a D.C. generator for constant pressure at variable speed. | 4th Oct 1918 | Box 38 \ 1 Scan029 | |
| Blank document page with a Print Room reception stamp from Derby. | 4th Oct 1918 | Box 38 \ 1 Scan030 | |
| Page from The Electrical Review journal discussing machine voltage and listing new patents. | 4th Oct 1918 | Box 38 \ 1 Scan031 | |
| Cover page marked with a Print Room reception stamp. | 2nd Nov 1913 | Box 38 \ 1 Scan032 | |
| Urgent need to test a double-strength spring on the petrol control valve to prevent wear on the needles. | 20th Sep 1918 | Box 38 \ 1 Scan033 | |
| Proposal for material changes to an altitude control valve for carburetters, specifying Brinell hardness. | 7th Nov 1918 | Box 38 \ 1 Scan034 | |
| Fitting of altitude control needles for 'Eagle' engines on DeH.4 machines. | 26th Apr 1917 | Box 38 \ 1 Scan035 | |
| Series 8 Altitude Controls, engine settings, and post-delivery adjustments. | 23th Nov 1917 | Box 38 \ 1 Scan036 | |
| Internal memorandum about standardising the altitude control needles for Falcon and Eagle engines. | 30th Nov 1917 | Box 38 \ 1 Scan037 | |
| Corrosion found on carburetter petrol control valves, suggesting the use of stainless steel for both the valves and rivets. | 11th Feb 1918 | Box 38 \ 1 Scan038 | |
| Carburettor vibration issues with the 8-Eagle Altitude Control Needle. | 16th Aug 1921 | Box 38 \ 1 Scan039 | |
| Design modifications to the steering gear for the 45/50 HP chassis. | 29th Nov 1918 | Box 38 \ 1 Scan040 | |
| Request to manufacture a single F.887 Steering Worm for testing purposes. | 28th Jan 1919 | Box 38 \ 1 Scan041 | |
| Query regarding the black finish and engraving on chassis steering column quadrants. | 20th Jun 1919 | Box 38 \ 1 Scan042 | |
| Assembly list for Chassis 1. E.X., detailing components, part numbers, and remarks for the 'F' section. | 30th Jun 1919 | Box 38 \ 1 Scan043 | |
| Fractured steering box rocking lever and front road spring during chassis testing on a bumping rig, including material analysis. | 11th Aug 1919 | Box 38 \ 1 Scan044 | |
| Analysis report on a fractured road spring, detailing its chemical composition and Brinell hardness tests. | 11th Aug 1919 | Box 38 \ 1 Scan045 | |
| 40/50 chassis bumping test, its setup, and a comparison of results to pre-war tests. | 18th Aug 1919 | Box 38 \ 1 Scan046 | |
| Tabulated log detailing component failures, their run time, and remarks on the issues. | 18th Apr 1918 | Box 38 \ 1 Scan047 | |
| Failure of a pendulum steering lever, debating its cause and appropriate material selection. | 27th Aug 1919 | Box 38 \ 1 Scan048 | |
| The mandatory Brinell hardness testing of steering levers to ensure correct heat treatment. | 6th Sep 1919 | Box 38 \ 1 Scan049 | |
| Proposal to standardize steering columns to two positions for English cars. | 19th Sep 1919 | Box 38 \ 1 Scan050 | |
| Fractured rocking lever in a steering box for a 40/50 HP chassis. | 25th Sep 1919 | Box 38 \ 1 Scan051 | |
| Decision between 'A' steering and a long chassis, relaying Mr. Royce's opinion on the matter. | 27th Sep 1919 | Box 38 \ 1 Scan052 | |
| Investigation into the failures of pendulum steering levers and summarizing results from bumping tests. | 30th Sep 1919 | Box 38 \ 1 Scan053 | |
| The rig testing of standard and redesigned levers, analysing failures and proposing design modifications to improve strength and reduce cracking. | 30th Sep 1919 | Box 38 \ 1 Scan054 | |
| Extract from Coachbuilders Conference No 6 discussing new steering column positions. | 8th Oct 1919 | Box 38 \ 1 Scan055 | |
| Standardisation of steering types and long chassis for the 40/50 HP model. | 13th Oct 1919 | Box 38 \ 1 Scan056 | |
| Proposal to abandon 'A' type steering in favour of 'B' type steering on the long chassis after the first 500 are produced. | 7th Oct 1919 | Box 38 \ 1 Scan057 | |
| Proposal to abandon 'A' type steering in favour of 'B' type for longer chassis models. | 9th Oct 1919 | Box 38 \ 1 Scan058 | |
| The decision to cancel a proposal to abandon 'A' type steering, continuing its use pending tests on an experimental long chassis. | 30th Oct 1919 | Box 38 \ 1 Scan059 | |
| The failure of a side member and steering rocking lever during a bump test on a 40/50 chassis. | 27th Nov 1919 | Box 38 \ 1 Scan060 | |
| Laboratory analysis report on a fractured steering rocking shaft and a car frame part. | 14th Apr 1919 | Box 38 \ 1 Scan061 | |
| Analysis of a component failure attributed to a low yield point and repeated bending stress. | 25th Nov 1919 | Box 38 \ 1 Scan062 | |
| Modifications requested by Mr. Royce for a steering box axle following a bump test. | 5th Dec 1919 | Box 38 \ 1 Scan063 | |
| Faulty oil lip type lubricators on the steering column, which are easily damaged, and a suggestion for a smaller replacement. | 29th Mar 1920 | Box 38 \ 1 Scan064 | |
| Response to various reported complaints about an open trials car, including noises and a radiator leak. | 14th Apr 1920 | Box 38 \ 1 Scan065 | |
| Follow-up letter detailing an ongoing investigation into vehicle faults, including a slipper drive and side shaft slack. | 6th Mar 1946 | Box 38 \ 1 Scan066 | |
| Failure of aluminium steering boxes and general unsatisfactory steering, with proposed considerations for improvement. | 23th Apr 1920 | Box 38 \ 1 Scan067 | |
| Improvements and tests on steering problems, specifically regarding springs and pendulum levers. | 28th Apr 1920 | Box 38 \ 1 Scan068 | |
| Design of a withdrawing device for a pendulum steering lever. | 3rd Jun 1920 | Box 38 \ 1 Scan069 | |
| Pressing for a scheme of plain thrust in the steering column using journal ball bearings to make it less reversible. | 2nd Aug 1920 | Box 38 \ 1 Scan070 | |
| Comparison of deflection and permanent set under load for Old style H section levers versus Oval section levers. | 19th Aug 1920 | Box 38 \ 1 Scan071 | |
| Test report card detailing a bumper spring failure. | 1st Sep 1920 | Box 38 \ 1 Scan072 | |
| Letter from Rolls-Royce of America reporting steering troubles on imported cars due to ball bearing wear. | 1st Sep 1920 | Box 38 \ 1 Scan073 | |
| Failure of a cross steering shaft on an experimental car due to low-speed steering wobbles. | 28th Oct 1920 | Box 38 \ 1 Scan074 | |
| Proposed thickening of a steering column ball bearing housing. | 27th Nov 1920 | Box 38 \ 1 Scan075 | |
| Steering column ball bearing housing slack and potential design modifications. | 4th Oct 1920 | Box 38 \ 1 Scan076 | |
| The uses and potential applications of Bakelite in automobile components like gears, coachwork, and steering wheels. | 21th Dec 1920 | Box 38 \ 1 Scan077 | |
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