| Description | Date | Identifier | |
| Practice of using gears instead of front-wheel brakes for descending hills. | 7th Dec 1937 | Box 6 \ 2 02-page027 | |
| Communicating the decision against fitting free wheels on cars, following a Sales Conference discussion. | 17th Dec 1927 | Box 6 \ 2 02-page028 | |
| Letter from Humfrey-Sandberg Company Ltd. discussing the design for a 20 HP car and the return of a model clutch. | 20th Dec 1927 | Box 6 \ 2 02-page029 | |
| Letter from Humfrey-Sandberg Company Ltd. regarding a model clutch and pioneering licenses. | 3rd Jan 1928 | Box 6 \ 2 02-page030 | |
| Letter regarding Packard's interest in a new design and production terms. | 6th Jan 1928 | Box 6 \ 2 02-page031 | |
| Letter regarding a decision not to pursue the application of a free wheel clutch to their cars. | 6th Jan 1928 | Box 6 \ 2 02-page032 | |
| Instructing the despatch of a small model clutch, previously sent for examination, to Col. The Master of Sempill. | 1st Jan 1928 | Box 6 \ 2 02-page033 | |
| Letter from Humfrey-Sandberg Company Ltd. discussing the trial of a 'free wheel' unit on a car. | 9th Jan 1928 | Box 6 \ 2 02-page034 | |
| Letter discussing a potential gearbox design with two clutches and the benefits of a free-wheel vehicle. | 9th Jan 1928 | Box 6 \ 2 02-page035 | |
| Potential application of the Humphrey Sandberg freewheel for single-cylinder test beds and supercharger drives. | 4th Oct 1928 | Box 6 \ 2 02-page036 | |
| Outlining four potential solutions to the problem of increased vehicle acceleration. | 10th Oct 1928 | Box 6 \ 2 02-page037 | |
| Letter to A.W. Claremont discussing the need for increased acceleration and proposing a test of a freewheel on the gearbox side shaft. | 24th Oct 1928 | Box 6 \ 2 02-page038 | |
| Alternative gearbox design using an epicyclic unit to provide an easily obtainable 3rd speed. | 24th Oct 1928 | Box 6 \ 2 02-page039 | |
| By F.H. Royce discussing novel epicyclic gearbox arrangements and patentable ideas. | 1st Nov 1928 | Box 6 \ 2 02-page040 | |
| Conclusions from testing a De Lavaud scheme freewheel back axle on a Talbot car. | 1st Nov 1928 | Box 6 \ 2 02-page041 | |
| Arranging the trial of a freewheel cancelling clutch and an epicyclic third gear. | 20th Nov 1928 | Box 6 \ 2 02-page042 | |
| Requesting the return of papers regarding a gear-changing device called a Synchronostat. | 20th Feb 1929 | Box 6 \ 2 02-page043 | |
| Advantages of a Synchrostat coupling over a freewheel device and requesting to test a car fitted with it. | 4th Mar 1929 | Box 6 \ 2 02-page044 | |
| From 'R' discussing various gearbox designs and potential improvements for SS and 20 HP models. | 5th Mar 1929 | Box 6 \ 2 02-page045 | |
| American schemes and the performance of an 'SS' vehicle after completing 14,000 miles. | 20th Mar 1929 | Box 6 \ 2 02-page046 | |
| Scheme for a freewheel in the sideshaft of the 20 HP gearbox. | 20th Mar 1929 | Box 6 \ 2 02-page047 | |
| And comparing different types of change-speed gearboxes. | 25th Mar 1929 | Box 6 \ 2 02-page048 | |
| Analysis of different gear changing schemes including Freewheel, Salerni coupling, and Synchro-mesh systems. | 25th Mar 1929 | Box 6 \ 2 02-page049 | |
| Gearbox designs, specifically detailing the advantages and disadvantages of internal mesh with dog clutches. | 25th Mar 1929 | Box 6 \ 2 02-page050 | |
| Gearbox difficulties and proposals, including an epicyclic gear with brake. | 1st Jan 1928 | Box 6 \ 2 02-page051 | |
| Report and advertisement for the Millam Free-Wheel and Sprag system. | 1st Jan 1928 | Box 6 \ 2 02-page052 | |
| The operation and advantages of the Millam Free-Wheel mechanism, complete with component illustrations. | 3rd Apr 1929 | Box 6 \ 2 02-page053 | |
| Required modifications to a gearbox roller cage for a 3rd speed easy change mechanism. | 3rd Apr 1929 | Box 6 \ 2 02-page054 | |
| Assembly of a freewheel mechanism with a hand-cancelling lever. | 23th Apr 1929 | Box 6 \ 2 02-page055 | |
| Modifications and manufacturing options for the freewheel mechanism in the G.4 gearbox sideshaft. | 23th Apr 1929 | Box 6 \ 2 02-page056 | |
| Technical memorandum discussing potential solutions to gearbox problems, focusing on silent and easy gear changes. | 3rd Jun 1929 | Box 6 \ 2 02-page057 | |
| The disadvantages of the Salerni Coupling and proposed modifications to its operation. | 3rd Jun 1929 | Box 6 \ 2 02-page058 | |
| Gearbox design improvements, including helical gears and the Salerni coupling. | 21th Sep 1929 | Box 6 \ 2 02-page059 | |
| Communication regarding the experimental fitting of an epicyclic third-speed gear. | 21th Sep 1929 | Box 6 \ 2 02-page060 | |
| Requesting a new epicyclic clutch spring and altering the clutch clearance for the 3rd speed gear. | 21th Sep 1929 | Box 6 \ 2 02-page061 | |
| Investigation into the comparative noise levels of spur, epicyclic, and internal gears for a silent 3rd speed gearbox. | 24th Dec 1929 | Box 6 \ 2 02-page062 | |
| Comparing an Isotta Fraschini's performance and gearbox with a proposed change speed gear design. | 1st Jan 1930 | Box 6 \ 2 02-page063 | |
| Mr. Salerni's visit and a potential patent conflict over a gear arrangement. | 13th Jan 1930 | Box 6 \ 2 02-page064 | |
| Development of a silent 4-speed car change speed gear, potentially using a Salerni coupling. | 13th Jan 1930 | Box 6 \ 2 02-page065 | |
| Technical memorandum comparing the silence and performance of various gearbox designs. | 20th Jan 1930 | Box 6 \ 2 02-page066 | |
| 'The Gearbox Problem,' reviewing current gearbox technologies and proposing a new epicyclic unit design. | 21th Feb 1930 | Box 6 \ 2 02-page067 | |
| Gearbox design options, including reverse units, servo drives, control methods, and freewheeling. | 21th Feb 1930 | Box 6 \ 2 02-page068 | |
| Gear and clutch design, comparing a 'Salerni' scheme with a suggested new constant mesh design. | 29th Apr 1930 | Box 6 \ 2 02-page069 | |
| Investigations and proposals for resolving car gear problems. | 29th Apr 1930 | Box 6 \ 2 02-page070 | |
| Various gearbox design alternatives, including gear ratios, clutches, and braking systems. | 29th Apr 1930 | Box 6 \ 2 02-page071 | |
| Gearbox design, including epicyclic trains, freewheel connections, and servo control systems. | 29th Apr 1930 | Box 6 \ 2 02-page072 | |
| Servo-assisted gear changes and an alternative freewheel sideshaft design. | 7th May 1930 | Box 6 \ 2 02-page073 | |
| The progress and results of the Salerni coupling applied to EAC.7. | 7th May 1930 | Box 6 \ 2 02-page074 | |
| List of urgent design work for cars, covering the petrol pump, carburetter, change gear, and hydraulic shock dampers. | 20th May 1930 | Box 6 \ 2 02-page075 | |
| On the philosophy of continuous improvement and forward-thinking design to maintain a standard of perfection. | 20th May 1930 | Box 6 \ 2 02-page076 | |
| Gearbox changing, silence, and the potential adoption of freewheel technology. | 15th Jan 1930 | Box 6 \ 2 02-page077 | |
| Gearbox performance, comparing gear quietness and functionality with competitors like Graham-Paige, Chrysler and Armstrong-Siddeley. | 15th Jan 1930 | Box 6 \ 2 02-page078 | |
| Problems and preliminary designs for a full epicyclic gearbox. | 2nd Apr 1930 | Box 6 \ 2 02-page079 | |
| Investigation into different methods of obtaining a necessary gear ratio, detailing five gear train arrangements. | 12th Apr 1930 | Box 6 \ 2 02-page080 | |
| Design investigation and patent application details for a synchro-mesh gear control system. | 12th Apr 1930 | Box 6 \ 2 02-page081 | |
| Analysis of gear change braking requirements, torque calculations, and potential control system improvements. | 12th Apr 1930 | Box 6 \ 2 02-page082 | |
| Page from a report discussing transmission difficulties and suggestions related to coasting. | 12th Apr 1930 | Box 6 \ 2 02-page083 | |
| Three schemes for gearbox problems, including diagrams and proposals. | 14th Apr 1930 | Box 6 \ 2 02-page084 | |
| Different gearbox and clutch mechanisms, comparing Armstrong-Siddeley, epicyclic, and Chrysler designs. | 14th Apr 1930 | Box 6 \ 2 02-page085 | |
| Technical memo discussing improvements to the change gear mechanism, including jaw clutches and resilient couplings. | 29th Apr 1930 | Box 6 \ 2 02-page086 | |
| Alternative designs for an 'Easy Change Third' gear, comparing a free wheel side shaft with a Maybach scheme. | 26th May 1930 | Box 6 \ 2 02-page087 | |
| Proposal for a scheme to cover the exposed lubricated surface of the change speed ball on the L.H. chassis change gear. | 29th May 1930 | Box 6 \ 2 02-page088 | |
| Gearbox problems and proposed epicyclic schemes, with comparisons to other designs. | 26th May 1930 | Box 6 \ 2 02-page089 | |
| Automatic gear change control systems, comparing features and potential designs. | 29th May 1930 | Box 6 \ 2 02-page090 | |
| Technical objections to the Maybach gearbox and considering alternative 'Easy Change 3rd' gear schemes. | 29th May 1930 | Box 6 \ 2 02-page091 | |
| The development and peculiarities of a freewheel sideshaft for a 25 HP gearbox. | 26th May 1930 | Box 6 \ 2 02-page092 | |
| Decision to drop the Maybach gearbox and focus on developing an alternative easy-change third gear. | 1st May 1930 | Box 6 \ 2 02-page093 | |
| The failure of a free-wheel device on car 12-G4 after 588 miles. | 31th May 1930 | Box 6 \ 2 02-page094 | |
| On the failure of the free-wheel mechanism for the third gear on a 20 HP car and the decision not to apply it to the Phantom car. | 2nd Jun 1930 | Box 6 \ 2 02-page095 | |
| Development and sales potential of an easy-change third gear and free-wheel mechanism. | 9th Jun 1930 | Box 6 \ 2 02-page096 | |
| Internal memorandum discussing an experimental easy change gearbox using a constant mesh double helical gear. | 2nd Jul 1930 | Box 6 \ 2 02-page097 | |
| Failed free-wheel for the 25 HP model and the need for a modified design. | 2nd Jul 1930 | Box 6 \ 2 02-page098 | |
| The development of an epicyclic easy-change gearbox, noting issues with the braking system. | 8th Jul 1930 | Box 6 \ 2 02-page099 | |
| 'Silent Third Gear' and the potential purchase of a Graham Paige car for evaluation. | 30th Jul 1930 | Box 6 \ 2 02-page100 | |
| The urgent requirement to improve the gearbox for the Phantom engine, focusing on the 2nd and 3rd speeds. | 22th Aug 1930 | Box 6 \ 2 02-page101 | |
| Testing of competitor cars, Studebaker and Graham Paige, in relation to developing a silent third gearbox. | 29th Aug 1930 | Box 6 \ 2 02-page102 | |
| Silent third gear and comparing Graham Paige and Studebaker cars. | 1st Sep 1930 | Box 6 \ 2 02-page103 | |
| Summary outlining design requirements and proposed schemes for a new change gear system, focusing on silent operation and gear engagement methods. | 20th Sep 1930 | Box 6 \ 2 02-page104 | |
| Technical comparison of various gearbox designs including spool gear, freewheel & jam clutch, and synchro-mesh. | 10th Sep 1930 | Box 6 \ 2 02-page105 | |
| Typed page from a report discussing an epicyclic gear design and project challenges. | 1st Aug 1930 | Box 6 \ 2 02-page106 | |
| Various gearbox schemes to achieve a silent third gear. | 2nd Sep 1930 | Box 6 \ 2 02-page107 | |
| Report comparing the Graham Paige car to the Phantom II, leading to a proposal for a new engine construction experiment. | 2nd Sep 1930 | Box 6 \ 2 02-page108 | |
| Development of a silent third gear, expressing concern over a return to an epicyclic gear design. | 8th Sep 1930 | Box 6 \ 2 02-page109 | |
| Schemes for a silent third gear, including an epicyclic design and fitting a freewheel to a Phantom car. | 9th Sep 1930 | Box 6 \ 2 02-page110 | |
| Modifications to cure a rattle in the L.H. Phantom change gear mechanism. | 22th Sep 1930 | Box 6 \ 2 02-page111 | |
| 'Maybach' gearbox and twelve-cylinder engine and the prospect of purchasing a car for evaluation. | 24th Sep 1930 | Box 6 \ 2 02-page112 | |
| Various 'easy change' gearbox schemes for the Phantom II and 25 HP models following a visit to West Wittering. | 30th Sep 1930 | Box 6 \ 2 02-page113 | |
| Gearbox from the U.S.A and the plan to fit Maybach type clutches. | 12th Oct 1931 | Box 6 \ 2 02-page114 | |
| From 'Sg.' to 'Hs.' discussing development schemes for 'easy change' gearboxes, including the Phantom II and Maybach clutches. | 3rd Oct 1930 | Box 6 \ 2 02-page115 | |
| Differences between the proposed epicyclic gear for the Phantom and the 25 HP, and the reasoning for fitting Maybach clutches. | 4th Oct 1930 | Box 6 \ 2 02-page116 | |
| Construction of a specimen epicyclic 3rd speed train for testing purposes. | 4th Oct 1930 | Box 6 \ 2 02-page117 | |
| Confirming the dispatch of drawings for a revised epicyclic 3rd speed gearbox for testing purposes. | 10th Oct 1930 | Box 6 \ 2 02-page118 | |
| Proposal for a combined direct electric and mechanically geared transmission system. | 14th Oct 1930 | Box 6 \ 2 02-page119 | |
| Schemes for a revised epicyclic 3rd speed gearbox. | 16th Oct 1930 | Box 6 \ 2 02-page120 | |
| Revisions to the epicyclic third gearbox and an accompanying drawing. | 25th Oct 1930 | Box 6 \ 2 02-page121 | |
| Modification to the jaw clutches in the revised epicyclic third-speed gearbox. | 28th Oct 1930 | Box 6 \ 2 02-page122 | |
| Sending scheme 3159, detailing a modification to the 1st speed dogs for the all-epicyclic gearbox. | 29th Oct 1930 | Box 6 \ 2 02-page123 | |
| On revisions to the epicyclic 3rd speed gearbox, detailing an experimental lubrication system. | 1st Oct 1930 | Box 6 \ 2 02-page124 | |
| Revisions to the epicyclic 3rd speed gearbox. | 10th Nov 1930 | Box 6 \ 2 02-page125 | |
| Review of the company's position on adopting various contemporary change gear technologies. | 1st Nov 1930 | Box 6 \ 2 02-page126 | |
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