| Description | Date | Identifier | |
| Testing a large throat carburetter, focusing on low-speed performance and power output. | 15th Jan 1925 | Box 74 \ 4 scan0199 | |
| Report page comparing the performance of a standard carburetter with a diffuser jet carburetter, including a performance graph. | 15th Jan 1925 | Box 74 \ 4 scan0200 | |
| Report page detailing experiments on carburettors, comparing a diffuser and a light air valve against standard components. | 15th Jan 1925 | Box 74 \ 4 scan0201 | |
| Carburettor and engine modifications to investigate power loss in a 20 HP engine. | 15th Jan 1925 | Box 74 \ 4 scan0202 | |
| Notes on rectifying gearbox noise by levelling and establishing the correct oil level. | 21th Oct 1907 | Box 75 \ 1 scan0001 | |
| Instruction memo to the Technical Committee outlining a theory on the cause of howling side shafts. | 19th Dec 1911 | Box 75 \ 1 scan0002 | |
| Analysis of a howling side shaft, calculating vibration frequencies based on engine speed and gear teeth. | 24th Jan 1911 | Box 75 \ 1 scan0003 | |
| Investigation into a harmonic vibration and a musical note relating to the side shaft and gearbox. | 24th Jan 1911 | Box 75 \ 1 scan0004 | |
| Instructions for diagnosing and curing howling side shafts. | 19th Dec 1911 | Box 75 \ 1 scan0005 | |
| Instructions regarding a howling side shaft, investigating why good gears become bad when paired with 'cured' intermediate gears due to harmonic vibrations. | 24th Jan 1911 | Box 75 \ 1 scan0006 | |
| Meeting minutes discussing the cause of howling side shafts in gearboxes. | 22th Dec 1911 | Box 75 \ 1 scan0007 | |
| The cause of a musical note in gearboxes and proposals for testing. | 22th Dec 1911 | Box 75 \ 1 scan0008 | |
| Committee discussion regarding the re-design of a gear box test rig. | 9th Mar 1912 | Box 75 \ 1 scan0009 | |
| To the technical committee regarding noise from the side shaft and gearbox, and the efforts to find a solution. | 9th Mar 1912 | Box 75 \ 1 scan0010 | |
| By Mr. Royce discussing three potential solutions to address the noise from a side shaft running idle in a gearbox. | 10th Mar 1912 | Box 75 \ 1 scan0011 | |
| Gearbox noise caused by the side shaft running idle and potential solutions. | 10th Mar 1912 | Box 75 \ 1 scan0012 | |
| Methods for changing gear and the use of different types of ball bearings. | 15th Mar 1912 | Box 75 \ 1 scan0013 | |
| Letter to Mr Royce regarding noise issues caused by an idling side shaft in gear boxes. | 15th Mar 1912 | Box 75 \ 1 scan0014 | |
| Abandoned gearbox design and the subsequent improved arrangement for the 40 and 60 HP models. | 13th Nov 1915 | Box 75 \ 1 scan0015 | |
| Description of the operation of a gearbox, detailing the engagement of top, second, and reverse gears. | 13th Nov 1915 | Box 75 \ 1 scan0016 | |
| Typed memorandum detailing the design considerations and applications of a specific gearbox, comparing it to older versions. | 13th Nov 1915 | Box 75 \ 1 scan0017 | |
| Objections and operational difficulties with a change gear mechanism, particularly regarding the quadrant shape and engaging gears. | 13th Nov 1915 | Box 75 \ 1 scan0018 | |
| Page fragment discussing the state of a counter-shaft under certain conditions. | 7th Jun 1912 | Box 75 \ 1 scan0019 | |
| Departmental memo concerning an urgent issue with noisy side shafts in gear boxes. | 7th Jun 1912 | Box 75 \ 1 scan0020 | |
| Departmental memo from E.P. regarding the unsatisfactory level of silence, warranting a concentrated effort. | 18th Mar 1912 | Box 75 \ 1 scan0021 | |
| From F.H. Royce to Claude Johnson regarding noisy side shafts on gearboxes and potential solutions. | 14th Jun 1912 | Box 75 \ 1 scan0022 | |
| Departmental memo concerning side shaft noises and the effect of the gearbox oil level. | 19th Jun 1912 | Box 75 \ 1 scan0023 | |
| Departmental memo discussing the source of noise being the side shaft, not the reverse pinion, and its relation to oil level. | 20th Jun 1912 | Box 75 \ 1 scan0024 | |
| From F.H.R. to Mr Johnson discussing chassis improvements, component quality, and comparisons to competitors. | 15th Nov 1912 | Box 75 \ 1 scan0025 | |
| Directive stating that a chassis should not be fitted with a big flywheel. | 1st Nov 1912 | Box 75 \ 1 scan0026 | |
| Low output of 'Very good' quality gearbox side shafts and the estimated cost increase to achieve 100% quality. | 1st Nov 1912 | Box 75 \ 1 scan0027 | |
| Cost breakdown for gearbox testing and considerations for increasing capacity. | 3rd May 1912 | Box 75 \ 1 scan0028 | |
| Departmental memo discussing the costs and methods for testing gearboxes to improve their quality. | 3rd May 1912 | Box 75 \ 1 scan0029 | |
| Departmental memo concerning figures for gearbox side shafts related to the Test department. | 3rd May 1912 | Box 75 \ 1 scan0030 | |
| Departmental memo requesting a cost and time analysis for improving the quality of side shafts. | 21th Nov 1912 | Box 75 \ 1 scan0031 | |
| Departmental memo requesting an investigation into the cause and cure for a noisy side shaft on car 1718. | 21th Nov 1912 | Box 75 \ 1 scan0032 | |
| Minutes of the 127th meeting discussing noisy side shafts and unit testing for gearboxes. | 5th Dec 1912 | Box 75 \ 1 scan0033 | |
| Meeting minutes discussing proposals for chassis testing rigs, side shaft improvements, and a gearbox oil pump. | 5th Dec 1912 | Box 75 \ 1 scan0034 | |
| Meeting minutes discussing the improvement of gears and the use of a chassis rig for testing. | 6th Dec 1912 | Box 75 \ 1 scan0035 | |
| Departmental memo regarding the investigation into noisy side shafts and a proposed solution using double helical gears. | 6th Dec 1912 | Box 75 \ 1 scan0036 | |
| Departmental memo discussing issues with noisy gears, axle vibrations, and planned experiments. | 11th Oct 1912 | Box 75 \ 1 scan0037 | |
| Internal request for two sets of soft side shaft gears for the Experimental Department. | 6th Dec 1912 | Box 75 \ 1 scan0038 | |
| Request for two sets of side shaft gears for testing and the use of an adjustable gear running rig. | 6th Dec 1912 | Box 75 \ 1 scan0039 | |
| Communicating Mr Johnson's urgent instruction regarding the 127th meeting minutes. | 10th Dec 1912 | Box 75 \ 1 scan0040 | |
| Departmental memo regarding noisy side shafts and the related production output quality. | 18th Dec 1912 | Box 75 \ 1 scan0041 | |
| Urgent instruction to the Works to manufacture a pair of side shaft gears using a Reinecker planer. | 20th Dec 1912 | Box 75 \ 1 scan0042 | |
| To Mr. Barrington requesting an update on the production status of improved side-shafts for a chassis under test. | 16th Jan 1913 | Box 75 \ 1 scan0043 | |
| Experiments investigating the cause of a pure musical note from noisy side shaft gears. | 5th Feb 1913 | Box 75 \ 1 scan0044 | |
| Gear tooth precision and constant velocity as a means to eliminate noise. | 5th Feb 1913 | Box 75 \ 1 scan0045 | |
| Failed experiment involving gears, flywheels, and bevels to achieve constant velocities. | 5th Feb 1913 | Box 75 \ 1 scan0046 | |
| Testing side shafts and gears, detailing issues with humming, knocking, and backlash. | 5th Feb 1913 | Box 75 \ 1 scan0047 | |
| Tests on various gears to diagnose and eliminate rattling and humming noises. | 5th Feb 1913 | Box 75 \ 1 scan0048 | |
| Experiments with friction drives and various gear sets to reduce grinding effects and noise. | 5th Feb 1913 | Box 75 \ 1 scan0049 | |
| Experiments with different types of gears, focusing on correcting for interference and reducing hum. | 1st Apr 1918 | Box 75 \ 1 scan0050 | |
| Technical analysis discussing flywheel inertia and its effect on the velocity of rigidly attached gears. | 1st Apr 1918 | Box 75 \ 1 scan0051 | |
| Gear tooth design, grinding processes for side shaft gears, and the use of hunting teeth. | 18th Dec 1912 | Box 75 \ 1 scan0052 | |
| Report page detailing an experiment on a gear rig, noting reduced vibration compared to standard gears. | 30th Apr 1913 | Box 75 \ 1 scan0053 | |
| Need for a better lubricant, like castor oil, and improved gear design for gearboxes and back axles to reduce wear. | 30th Apr 1913 | Box 75 \ 1 scan0054 | |
| Introduction of thrust bearings and a single helical gear for a 4-speed gearbox at Le Canadel to reduce sideshaft noise. | 7th Feb 1914 | Box 75 \ 1 scan0055 | |
| Noisy third gear on chassis 16CA, attributing the fault to the curvature of the gear teeth. | 7th Feb 1914 | Box 75 \ 1 scan0056 | |
| Noisy lay shafts in gear boxes, particularly when starting from cold, with handwritten notes from Mr. Royce. | 7th Feb 1914 | Box 75 \ 1 scan0057 | |
| Requesting instructions on how to act regarding a recurring complaint about deliveries. | 26th Feb 1914 | Box 75 \ 1 scan0058 | |
| Typed internal memo regarding experiments and referencing Mr. Royce's notes. | 26th Feb 1914 | Box 75 \ 1 scan0059 | |
| Noisy gearbox layshafts, the use of close-fitting gears, and the effects of thick versus thin oil. | 20th Mar 1914 | Box 75 \ 1 scan0060 | |
| Noisy side shafts and the use of oil in the gearbox. | 20th Mar 1914 | Box 75 \ 1 scan0061 | |
| Effect of oil thickness on noisy lay shafts in gear boxes. | 14th Mar 1914 | Box 75 \ 1 scan0062 | |
| Experiments for quieter side shafts and oil thickness for standardisation. | 23th Feb 1914 | Box 75 \ 1 scan0063 | |
| Discussion about a noisy gearbox side shaft on car 2704, its potential cause, and the remedy applied. | 3rd Mar 1914 | Box 75 \ 1 scan0064 | |
| Results of using thinner oil and slacker gears to reduce gearbox noise. | 1st Apr 1914 | Box 75 \ 1 scan0065 | |
| The optimal oil viscosity for gearboxes to reduce noise and save power. | 9th Apr 1914 | Box 75 \ 1 scan0066 | |
| Difficulty of producing quiet side shaft gears and proposing a change to single or double helical gears. | 19th Jun 1914 | Box 75 \ 1 scan0067 | |
| The use of single helical gears and the testing of ball bearings to handle end thrust. | 21th May 1914 | Box 75 \ 1 scan0068 | |
| Extract of discussion points with Mr. Royce regarding pistons, shock absorbers, and the speedometer pulley for a chassis. | 17th Dec 1918 | Box 75 \ 1 scan0069 | |
| Report index detailing alterations and experimental work for the 40/50 HP present type chassis. | 18th Dec 1918 | Box 75 \ 1 scan0070 | |
| Report discussing the clutch, gearbox, and back axle, covering oil retention, gear mechanisms, and braking issues. | 18th Dec 1918 | Box 75 \ 1 scan0071 | |
| The specification of alterations to be made to the 40/50 HP chassis. | 8th Jan 1919 | Box 75 \ 1 scan0072 | |
| Changes to gearbox and axle manufacturing methods, conditional on experimental proof of improvement. | 22th Jan 1919 | Box 75 \ 1 scan0073 | |
| Data sheet listing chassis gear ratios, miles per hour at 1000 RPM, and corresponding engine revolutions for various speeds. | 29th Jan 1919 | Box 75 \ 1 scan0074 | |
| Arguing against reverting to a 3-speed gearbox and strongly advocating for the 4-speed gearbox. | 10th Feb 1919 | Box 75 \ 1 scan0075 | |
| Arguing for the continued use of the 4-speed gearbox over the proposed 3-speed, citing customer satisfaction and performance. | 11th Feb 1919 | Box 75 \ 1 scan0076 | |
| Page 2 of a discussion on the customer desire for a 4-speed gearbox. | 25th Oct 1918 | Box 75 \ 1 scan0077 | |
| Preference for a 4-speed gearbox over a 3-speed, collecting views for Mr. Royce. | 12th Feb 1919 | Box 75 \ 1 scan0078 | |
| Arguing in favour of a 4-speed gearbox over a 3-speed gearbox. | 12th Feb 1919 | Box 75 \ 1 scan0079 | |
| The merits of a 4-speed gearbox versus a 3-speed, considering performance, cost, weight, and petrol consumption. | 12th Feb 1919 | Box 75 \ 1 scan0080 | |
| Continuation of a memo discussing the need to improve consumption due to poor quality. | 12th Feb 1919 | Box 75 \ 1 scan0081 | |
| Customer preference for 4-speed gearboxes over 3-speed models. | 13th Feb 1919 | Box 75 \ 1 scan0082 | |
| Merits of a 3-speed gearbox versus a 4-speed gearbox for different car models. | 18th Mar 1919 | Box 75 \ 1 scan0083 | |
| Assembly completion list for Chassis 1 E.X., detailing the 'G' section components used. | 30th Jun 1919 | Box 75 \ 1 scan0084 | |
| Modifying a casting for bronze bearings on the 40/50 chassis gearbox to prevent it fouling the dynamo drive belt. | 28th Jul 1919 | Box 75 \ 1 scan0085 | |
| Test report on the performance of the gearbox, axle, and brakes for Chassis 1.E.X. | 28th Jul 1919 | Box 75 \ 1 scan0086 | |
| List of new parts and modifications, indicating whether the standardisation sheet was signed for each item. | 27th Aug 1919 | Box 75 \ 1 scan0087 | |
| Advantages and disadvantages of a three-speed gearbox with central control versus a four-speed gearbox. | 26th Apr 1917 | Box 75 \ 1 scan0088 | |
| Complaints about the engine starter clutch mechanism and suggesting improvements. | 11th Nov 1919 | Box 75 \ 1 scan0089 | |
| Technical memorandum regarding issues and correct procedures for the erection of engine gears. | 2nd Dec 1919 | Box 75 \ 1 scan0090 | |
| Gear fitting, wear, and lubrication, proposing improvements. | 16th Apr 1919 | Box 75 \ 1 scan0091 | |
| On starter motor issues in cold weather, specifically the clutch failing to engage, requesting an investigation. | 3rd Dec 1919 | Box 75 \ 1 scan0092 | |
| Suggesting the solenoid which engages the starter motor clutch could also be used to engage the main switch. | 4th Dec 1919 | Box 75 \ 1 scan0093 | |
| Extract detailing issues with the chassis electrical starting mechanism due to cold weather. | 4th Dec 1919 | Box 75 \ 1 scan0094 | |
| Investigation into self-starter failures with suggestions for mechanical and electrical improvements. | 9th Dec 1919 | Box 75 \ 1 scan0095 | |
| The investigation into a faulty actuating box for an engine starter, noting the effect of oil. | 19th Feb 1920 | Box 75 \ 1 scan0096 | |
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