| Description | Date | Identifier | |
| Standardisation of coarser pitch rear axle gears to enable quieter axle production. | 23th May 1923 | Box 6 \ 4 04-page007 | |
| Cost savings on the 20 HP chassis by standardising coarser pitch rear axle gears. | 1st Jun 1923 | Box 6 \ 4 04-page008 | |
| Design completion of a 4-speed side lever servo drive and gearbox for the Goshawk project. | 27th Jun 1924 | Box 6 \ 4 04-page009 | |
| Technical memorandum describing the features and mechanics of the Goshawk III 4-speed gearbox with servo. | 6th Jul 1924 | Box 6 \ 4 04-page010 | |
| Dimensional changes to gearbox components for clearance. | 23th Jul 1924 | Box 6 \ 4 04-page011 | |
| Manufacturing process and design modifications for the Goshawk III four-speed gearbox striking fork. | 23th Jul 1924 | Box 6 \ 4 04-page012 | |
| Construction and modifications of the Goshawk III 4-speed gearbox casing. | 24th Jul 1924 | Box 6 \ 4 04-page013 | |
| Drawing Lec.1913 for the Goshawk III four-speed gearbox, focusing on the casing and declutching gear. | 27th Aug 1924 | Box 6 \ 4 04-page014 | |
| Points requiring attention for the 4-Speed Goshawk Gearbox model. | 12th Mar 1924 | Box 6 \ 4 04-page015 | |
| List of engineering notes and required modifications for various mechanical components. | 12th Mar 1924 | Box 6 \ 4 04-page016 | |
| Design note regarding a square-edged chamfered bore to clean foreign matter from a shaft. | 8th Dec 1924 | Box 6 \ 4 04-page017 | |
| Improvements to the Goshawk model, including a 4-speed gearbox, front brakes, and a strengthened crankshaft. | 8th Dec 1924 | Box 6 \ 4 04-page018 | |
| Modifications and feedback on the Goshawk 4-speed gearbox. | 10th Dec 1924 | Box 6 \ 4 04-page019 | |
| Fitting and performance of a 4-speed gearbox with right-hand change on a 20 HP car. | 11th Dec 1924 | Box 6 \ 4 04-page020 | |
| Graph plotting road speed against engine RPM for the Goshawk II & III gearboxes. | 26th Nov 1932 | Box 6 \ 4 04-page021 | |
| Recommendation for car 7-G-11 with a 4-speed gearbox to be used at WW until front wheel brakes are completed. | 13th Dec 1924 | Box 6 \ 4 04-page022 | |
| Testing of a Goshawk 3 three-speed gearbox with a servo mechanism. | 7th Jan 1925 | Box 6 \ 4 04-page023 | |
| Two arrangement options for the Goshawk three-speed gearbox with a central change and servo. | 10th Jan 1924 | Box 6 \ 4 04-page024 | |
| Cancellation of a new three-speed gearbox for the 20 HP chassis and the revised production plan. | 16th Jan 1925 | Box 6 \ 4 04-page025 | |
| Secret memo suggesting thorough testing of the reverse shaft and gear on the Goshawk 3 four-speed box. | 9th Jan 1925 | Box 6 \ 4 04-page026 | |
| Dynamometer testing of a 4-speed gearbox for 20 HP cars, detailing gear engagement issues and subsequent modifications. | 20th Jan 1925 | Box 6 \ 4 04-page027 | |
| Road wheel dynamometer testing of a gearbox, detailing component wear and damage after running. | 20th Jan 1925 | Box 6 \ 4 04-page028 | |
| Report page detailing measures to diagnose shaft deflection and gear meshing issues. | 21th Jan 1925 | Box 6 \ 4 04-page029 | |
| Failures in the Four Speed Box for the 20 HP Chassis, attributing the cause to a design issue. | 21th Jan 1925 | Box 6 \ 4 04-page030 | |
| Telegram received by telephone regarding a gear problem and a proposed solution. | 26th Jan 1925 | Box 6 \ 4 04-page031 | |
| Telegram received by telephone regarding a fault with sliding gears and a three-speed box. | 26th Jan 1925 | Box 6 \ 4 04-page032 | |
| Form for recording a telegram received by telephone. | 26th Jan 1925 | Box 6 \ 4 04-page033 | |
| Graph of road speed against engine RPM for the Goshawk II & III gear ratios. | 27th Jan 1925 | Box 6 \ 4 04-page034 | |
| Further tests and modifications to a 'USA' 4-speed gearbox due to overheating issues. | 27th Jan 1925 | Box 6 \ 4 04-page035 | |
| Gearbox performance and durability tests, comparing 4-speed and 3-speed boxes. | 27th Jan 1925 | Box 6 \ 4 04-page036 | |
| Tests conducted on a 'USA' 4-speed gearbox to confirm the reliability of modifications. | 28th Jan 1925 | Box 6 \ 4 04-page037 | |
| Tests conducted on a 'USA' 4-speed gearbox, focusing on modifications to the reverse gear. | 29th Jan 1925 | Box 6 \ 4 04-page038 | |
| Design issues and suggested solutions for a 4-speed gearbox. | 29th Jan 1925 | Box 6 \ 4 04-page039 | |
| Potential faults and cures for a gearbox, referencing pinions, reverse gear, and a new three-speed box design. | 29th Jan 1923 | Box 6 \ 4 04-page040 | |
| Wire confirmation requesting test results for a four-speed gearbox with an old type reverse shaft and modified fork. | 29th Jan 1923 | Box 6 \ 4 04-page041 | |
| Testing a 'USA' 4-speed gearbox, detailing issues with the reverse and first gears. | 30th Jan 1925 | Box 6 \ 4 04-page042 | |
| Secret memo detailing experimental improvements to a gearbox, including the reverse shaft, pinion sleeve, and striking forks. | 30th Jan 1925 | Box 6 \ 4 04-page043 | |
| Defects and potential improvements for a 4-speed gearbox. | 2nd Feb 1925 | Box 6 \ 4 04-page044 | |
| Secret memo discussing issues and improvements for a relay advance and a four-speed gearbox. | 3rd Feb 1925 | Box 6 \ 4 04-page045 | |
| Modifications to pinions and shafts for improved silence and production. | 25th Feb 1943 | Box 6 \ 4 04-page046 | |
| Modifications to a 4-speed gearbox, including a detachable change speed lever and a simplified manufacturing process. | 25th Feb 1943 | Box 6 \ 4 04-page047 | |
| Cause and potential cure for gears creeping in a 4-speed gearbox. | 1st Feb 1925 | Box 6 \ 4 04-page048 | |
| Technical analysis discussing epicyclic creep and potential modifications to forks, shafts, and pinions. | 4th Feb 1925 | Box 6 \ 4 04-page049 | |
| Secret memorandum detailing instructions and theory for modifying a 4-speed gearbox. | 4th Feb 1925 | Box 6 \ 4 04-page050 | |
| Issues with the 1st and 2nd speed gears working out on a USA8 4-speed gearbox. | 1st Feb 1925 | Box 6 \ 4 04-page051 | |
| Telegram regarding a potential issue with a reverse wheel, shaft and bearings causing jittering. | 5th Feb 1926 | Box 6 \ 4 04-page052 | |
| Secret memo discussing the causes of 'creep' in the reverse shaft of a 4-speed gearbox for 'India'. | 1st Feb 1925 | Box 6 \ 4 04-page053 | |
| Solutions to pinion gear creeping, slack, and binding issues. | 30th Jan 1925 | Box 6 \ 4 04-page054 | |
| Secret memo outlining experiments for a 4-speed gearbox, focusing on pinions and a splined shaft. | 1st Feb 1925 | Box 6 \ 4 04-page055 | |
| Up-to-date suggestions for a 4-speed gearbox. | 14th Feb 1925 | Box 6 \ 4 04-page056 | |
| Drawing for a plain bearing reverse shaft, detailing lubrication modifications and material considerations. | 1st Feb 1925 | Box 6 \ 4 04-page057 | |
| Experiment on a plain bearing reverse shaft for a 4-speed gearbox, comparing whitemetal and bronze bearings. | 1st Feb 1935 | Box 6 \ 4 04-page058 | |
| The Goshawk II & III chassis gear ratios. | 12th Feb 1928 | Box 6 \ 4 04-page059 | |
| Design of a 4-speed gearbox, specifically a torsionally free double pinion system. | 13th Mar 1925 | Box 6 \ 4 04-page060 | |
| Solutions for a reverse gear issue in a 4-speed gearbox, including different bearing and gear arrangements. | 4th Feb 1925 | Box 6 \ 4 04-page061 | |
| Modifications to a gearbox to address issues with torque bind and gear selection. | 17th Mar 1925 | Box 6 \ 4 04-page062 | |
| Secret report on the Goshank III - India 4-speed gearbox test. | 17th Mar 1925 | Box 6 \ 4 04-page063 | |
| The full torque testing of a parallel reverse shaft, detailing observations on gear meshing and performance. | 17th Mar 1935 | Box 6 \ 4 04-page064 | |
| Experiment thinning down splines for the first and second speed pinion, with a production suggestion. | 17th Feb 1935 | Box 6 \ 4 04-page065 | |
| Secret memorandum proposing modifications and further testing on the splines of a 4-speed gearbox for India. | 17th Feb 1925 | Box 6 \ 4 04-page066 | |
| Testing of a plain bearing reverse shaft and potential for rattle. | 17th Feb 1925 | Box 6 \ 4 04-page067 | |
| Secret memo detailing the results of two successful tests conducted on a 4-speed gearbox. | 17th Feb 1925 | Box 6 \ 4 04-page068 | |
| Progress report on foot brake improvements for the 7-0-11 car, noting a reduction in groaning and squeaking. | 19th Feb 1925 | Box 6 \ 4 04-page069 | |
| Secret internal memorandum detailing the results of tests on an India - 4 speed gearbox. | 19th Feb 1925 | Box 6 \ 4 04-page070 | |
| Tests on a reverse shaft, comparing results with and without plunger springs and using different forks. | 19th Feb 1938 | Box 6 \ 4 04-page071 | |
| Technical memorandum discussing gearbox shaft experiments, including a sketch of a proposed reverse shaft. | 19th Feb 1925 | Box 6 \ 4 04-page072 | |
| Wired message suggesting a logical cure for reverse by using specific bearing and bushing arrangements. | 19th Mar 1926 | Box 6 \ 4 04-page073 | |
| Secret internal memo responding to a telegram about torsionally free pinions for an India 4-speed gearbox. | 20th Feb 1925 | Box 6 \ 4 04-page074 | |
| Rough drawing and experiment for torsionally free pinions on a 4-speed gearbox for India. | 21th Feb 1925 | Box 6 \ 4 04-page075 | |
| Secret memo detailing the first test of a reverse torsionally free pinion in an India 4-speed gearbox. | 23th Feb 1925 | Box 6 \ 4 04-page076 | |
| Gearbox testing detailing issues with gear meshing, component damage, and proposed design modifications. | 23th Feb 1925 | Box 6 \ 4 04-page077 | |
| Secret test report on an India 4-speed gearbox, detailing the results of the second test on torsionally free reverse pinions. | 23th Mar 1926 | Box 6 \ 4 04-page078 | |
| Suggestion for facilitating gear assembly by drilling alignment holes and using etched marks. | 23th Feb 1935 | Box 6 \ 4 04-page079 | |
| Design modifications for a 4-speed gearbox for India, based on a telegram from Mr. Royce. | 26th Feb 1925 | Box 6 \ 4 04-page080 | |
| Graph of car speed versus engine RPM for various 20 HP gear box ratios with an 11/50 axle ratio and 31.400 inch effective wheel diameter. | 2nd Feb 1925 | Box 6 \ 4 04-page081 | |
| 'INDIA' 4-speed gearbox, detailing an issue where the second speed gear disengages under power. | 27th Feb 1925 | Box 6 \ 4 04-page082 | |
| 40/50 HP gearbox test, noting issues with gears working themselves out. | 28th Feb 1925 | Box 6 \ 4 04-page083 | |
| Request to test a car with a complete 4-speed gearbox in London before production. | 2nd Mar 1925 | Box 6 \ 4 04-page084 | |
| Secret memo discussing a recurring fault with the 2nd speed on a 4-speed gearbox for the 'India' model. | 12th Mar 1925 | Box 6 \ 4 04-page085 | |
| Secret memo regarding production and delivery estimates for the 'India' four-speed gearbox and four-wheel brakes. | 3rd Mar 1925 | Box 6 \ 4 04-page086 | |
| Secret memo regarding experiments and test results for a 4-speed gearbox. | 3rd Mar 1925 | Box 6 \ 4 04-page087 | |
| Secret memo on 4-speed gearbox modifications for India, discussing design changes and patentable features. | 3rd Mar 1925 | Box 6 \ 4 04-page088 | |
| Test drive in London of a 4-speed gearbox fitted to a 20 HP car. | 4th Mar 1925 | Box 6 \ 4 04-page089 | |
| The dismantling, condition, and testing of the 'India' 4-speed gearbox. | 1st Mar 1925 | Box 6 \ 4 04-page090 | |
| Confirmation of a telephone message attaching Authorisation Sheets and actioning the introduction of parts. | 5th Mar 1925 | Box 6 \ 4 04-page091 | |
| Authorisation to introduce a change into 'INDIA' regarding the first and second speed wheels. | 1st Mar 1925 | Box 6 \ 4 04-page092 | |
| Tests conducted on an 'India' 4-speed gearbox. | 25th Sep 1934 | Box 6 \ 4 04-page093 | |
| Technical memorandum discussing a mystery fault with the second speed of a 4-speed gearbox, suspecting shaft bending and proposing solutions. | 7th Mar 1925 | Box 6 \ 4 04-page094 | |
| Secret memo regarding the 'India' four-speed gearbox and its incorporation into the 'G' Series chassis. | 9th Mar 1925 | Box 6 \ 4 04-page095 | |
| Secret memorandum discussing the redesign of a 2nd motion shaft for a 4-speed gearbox intended for India. | 17th Mar 1925 | Box 6 \ 4 04-page096 | |
| Tests carried out on the 'India' gearbox. | 7th Mar 1925 | Box 6 \ 4 04-page097 | |
| Gearbox testing, focusing on gear disengagement issues and comparing different gearbox models. | 17th Mar 1925 | Box 6 \ 4 04-page098 | |
| Test of an 'India' gearbox with 14.5° obliquity gears in an old 40/50 HP car. | 18th Mar 1925 | Box 6 \ 4 04-page099 | |
| AJS's visit to Derby to review experiments on gearbox components. | 18th Mar 1925 | Box 6 \ 4 04-page100 | |
| Suggestion for overcoming pinion unmeshing issues in the 'India' four-speed gearbox. | 21th Mar 1925 | Box 6 \ 4 04-page101 | |
| Technical drawing with annotations detailing a design for a splined shaft with helical portions. | 21th Mar 1925 | Box 6 \ 4 04-page102 | |
| Authorisation sheet for a modification to the Brake Wheel and Gear on project 'India'. | 19th Mar 1929 | Box 6 \ 4 04-page103 | |
| Secret memo considering a patent for a cost-saving method of attaching gears in a 4-speed gearbox. | 30th Mar 1925 | Box 6 \ 4 04-page104 | |
| Tests conducted on an obsolete 'India' gearbox to diagnose a gear disengagement fault. | 20th Mar 1925 | Box 6 \ 4 04-page105 | |
| Authorisation sheet No.6 for the 'INDIA' project, regarding covers for the gearbox. | 23th Mar 1925 | Box 6 \ 4 04-page106 | |
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