| Description | Date | Identifier | |
| Forwarding a description of the Lentz gear from a publication and reports from committee members. | 15th Jan 1912 | Box 136 \ 4 scan0016 | |
| Departmental memo discussing the inefficiency of the Lentz gear. | 15th Jan 1912 | Box 136 \ 4 scan0017 | |
| Departmental memo discussing Mr. Platford's initial negative opinion on the Lentz Gear system and plans for further investigation. | 15th Jan 1912 | Box 136 \ 4 scan0018 | |
| Departmental memo regarding reports on the Lentz Gear and arranging a chassis for testing. | 10th Apr 1912 | Box 136 \ 4 scan0019 | |
| Departmental memo regarding the testing of axles for the Lentz Gear. | 13th Apr 1912 | Box 136 \ 4 scan0020 | |
| Letter from S.H. Morden enclosing a description and diagrams of the 'Strat' Gear for the attention of Mr. E.W. Hive. | 7th Oct 1925 | Box 136 \ 4 scan0021 | |
| Hand-drawn diagram illustrating a mechanical concept involving a crankshaft, friction wheel, and an expansible track. | 7th Oct 1925 | Box 136 \ 4 scan0022 | |
| Design drawing of an expansible track friction drive mechanism. | 7th Oct 1925 | Box 136 \ 4 scan0023 | |
| Brief description of the STRAT GEAR mechanism and its principles of operation. | 7th Oct 1925 | Box 136 \ 4 scan0024 | |
| Page 2 of a document describing the functions and chief features of a variable speed gear. | 14th Feb 1927 | Box 136 \ 4 scan0025 | |
| Letter discussing an article on a competitor's silent four-speed internal-underdrive transmission and suggesting experimental development. | 14th Feb 1927 | Box 136 \ 4 scan0026 | |
| Merits of Bostock & Bramley's parallel worm gears compared to other types for use in engines and chassis. | 8th Apr 1928 | Box 136 \ 4 scan0027 | |
| Cover note regarding details of a patent gearbox and an attached letter. | 15th Jun 1928 | Box 136 \ 4 scan0028 | |
| Letter to Messrs. Pierre Loyer rejecting their proposal for a simplified gear changing mechanism. | 18th Jun 1928 | Box 136 \ 4 scan0029 | |
| Letter to Mr. Basil Johnson regarding developments in gearbox technology in the United States. | 31th Aug 1928 | Box 136 \ 4 scan0030 | |
| From Maurice Olley to Mr. Royce regarding the design and quiet operation of an Ahlen gearbox. | 16th Jul 1930 | Box 136 \ 4 scan0031 | |
| Gearbox invention by M. Viarengo. | 16th Jul 1930 | Box 136 \ 4 scan0032 | |
| Letter from M. Viarengo offering a patent for a progressive speed change system for automobiles. | 8th Jul 1930 | Box 136 \ 4 scan0033 | |
| Enclosed particulars of a Mercedes supercharged straight 8 and its gearbox. | 23th Sep 1930 | Box 136 \ 4 scan0034 | |
| Enquiries into the Daimler easy change gearbox and fluid flywheel before the Motor Show. | 27th Sep 1930 | Box 136 \ 4 scan0035 | |
| Inquiry regarding the Daimler easy change gearbox and fluid flywheel. | 13th Oct 1930 | Box 136 \ 4 scan0036 | |
| Location of a full report on the tests of a Daimler Fluid Flywheel. | 14th Oct 1930 | Box 136 \ 4 scan0037 | |
| Confirming sight of a report on trials in London and Paris, which referenced the Daimler gearbox. | 15th Oct 1930 | Box 136 \ 4 scan0038 | |
| The progress of experiments with Maybach type clutches and helical 3rd speed. | 14th Nov 1930 | Box 136 \ 4 scan0039 | |
| Post Office Telegram enquiring about the delivery of a Chrysler gearbox. | 27th Jul 1937 | Box 136 \ 4 scan0040 | |
| Implications of a shorter gear lever on the Chrysler gearbox in a Right-Hand drive chassis. | 2nd Mar 1931 | Box 136 \ 4 scan0041 | |
| Potential use of a Chrysler gearbox to avoid delays associated with a new design. | 1st Feb 1931 | Box 136 \ 4 scan0042 | |
| Confirming the dispatch of a Chrysler gearbox by passenger train. | 14th Feb 1931 | Box 136 \ 4 scan0043 | |
| Letter to the Experimental Department regarding a new patented Infinitely Variable Gear. | 11th Apr 1931 | Box 136 \ 4 scan0044 | |
| Letter outlining the final conditions for a gear invention and proposing a meeting to present designs for a motor car and motor bicycle. | 13th Apr 1931 | Box 136 \ 4 scan0045 | |
| Letter from the Experimental Department requesting patent information for an Infinitely Variable Gear. | 13th Apr 1931 | Box 136 \ 4 scan0046 | |
| Letter from engineer B. Vallance responding to queries on a freewheel gear design. | 27th Apr 1931 | Box 136 \ 4 scan0047 | |
| Obtaining competitor cars, a Voisin and a Graham Paige, to evaluate their gearbox technology. | 4th May 1931 | Box 136 \ 4 scan0048 | |
| The 'Volson Gear' and a reference to a previous sketch and description. | 5th May 1931 | Box 136 \ 4 scan0049 | |
| Letter from consulting engineer W.W. Constantine regarding a royalty fee for a synchro-mesh transmission patent. | 4th Jun 1931 | Box 136 \ 4 scan0050 | |
| Sketch detailing the lubrication method for the 3rd motion shaft in a Chrysler spool gearbox. | 1st Dec 1931 | Box 136 \ 4 scan0051 | |
| Blueprint detailing a Chrysler 1st Motion Shaft and its components. | 3rd Feb 1933 | Box 136 \ 4 scan0052 | |
| Comparing transmission slack and 'chunking' noise in cars fitted with the Wilson epicyclic gearbox. | 3rd Feb 1933 | Box 136 \ 4 scan0053 | |
| Keeping in touch with Maybach about their new gearbox. | 20th May 1933 | Box 136 \ 4 scan0054 | |
| Letter from Ernst Schneider discussing developments in gearbox and transmission technology, including Maybach and semi-automatic types. | 19th May 1933 | Box 136 \ 4 scan0055 | |
| Letter from Ernst Schneider discussing a potential manufacturing agreement for a transmission. | 20th Jul 1933 | Box 136 \ 4 scan0056 | |
| Cover note for a letter addressed to Mr. A. Hukins of E.N.V. Engineering Co. Ltd. concerning a Preselective Gear Box. | 20th Jul 1933 | Box 136 \ 4 scan0057 | |
| Letter to E.N.V. Engineering regarding a preselective gearbox and its suitability for testing. | 18th Jul 1933 | Box 136 \ 4 scan0058 | |
| The testing and analysis of a synchromesh gearbox from an Alvis chassis. | 13th Sep 1933 | Box 136 \ 4 scan0059 | |
| Letter to Bernard Thomson returning a loaned portfolio on synchromesh gearboxes. | 19th Sep 1933 | Box 136 \ 4 scan0060 | |
| Proposal to fit a servo to an E.N.V. gearbox for trial on a 20/25 car. | 29th Sep 1933 | Box 136 \ 4 scan0061 | |
| The trial of a Reo car fitted with an automatic gear change. | 10th Oct 1933 | Box 136 \ 4 scan0062 | |
| Two suggested modifications to the E.N.V. gearbox casing for the 20/25 Car to increase strength. | 31th Oct 1933 | Box 136 \ 4 scan0063 | |
| The De Normanville gearbox, tested on a Humber car, detailing its operation and suitability. | 3rd Nov 1933 | Box 136 \ 4 scan0064 | |
| Issues and observations on a car's transmission and engine performance. | 3rd Nov 1933 | Box 136 \ 4 scan0065 | |
| Responding to a report on the 'Humber' Epicyclic Gearbox and agreeing with a recommendation. | 6th Nov 1933 | Box 136 \ 4 scan0066 | |
| Letter to Messrs. Pratt & Manley declining an interview but requesting drawings for the Puls Pre-selective Gearbox. | 8th Nov 1933 | Box 136 \ 4 scan0067 | |
| Merits of preselective gearboxes versus synchromesh patterns for various vehicles. | 10th Nov 1933 | Box 136 \ 4 scan0068 | |
| The patterns for the Humber Epicyclic Gearbox for the 40/50 and 20/25 models. | 13th Nov 1933 | Box 136 \ 4 scan0069 | |
| Information for fitting an E.N.V. gearbox on a 20/25 car. | 17th Nov 1933 | Box 136 \ 4 scan0070 | |
| Note on modifications to the silencer and gearbox selector lever. | 17th Nov 1933 | Box 136 \ 4 scan0071 | |
| Proposed stay for the E.N.V. gearbox on the 20/25 model. | 24th Nov 1933 | Box 136 \ 4 scan0072 | |
| Modifications to an E.N.V. gearbox for a 20/25 model, retaining the existing clutch but with a modified shaft and a new lever. | 22th Dec 1933 | Box 136 \ 4 scan0073 | |
| Attached letter from C.H. Humphreys Ltd about a car. | 17th Jan 1934 | Box 136 \ 4 scan0074 | |
| Letter from Wilson & Humphreys Ltd. proposing an invention for a preselection gearbox. | 12th Jan 1934 | Box 136 \ 4 scan0075 | |
| Trial report on an Isotta car fitted with a Wilson Gearbox and vacuum servo actuation. | 23th Feb 1934 | Box 136 \ 4 scan0076 | |
| Returning papers and concluding that the Campbell Gearbox design is not of interest. | 28th Mar 1934 | Box 136 \ 4 scan0077 | |
| Pre-selection device for synchromesh gearboxes from the Highfield Gear Co., detailing its operation and a potential fault. | 11th Apr 1934 | Box 136 \ 4 scan0078 | |
| Assessment of a pre-selection device for synchromesh gearboxes designed by Alfred Herbert Limited. | 11th Apr 1934 | Box 136 \ 4 scan0079 | |
| Letter from Burgess Products Company inviting executives for a demonstration of the Monodrive automatic transmission. | 21th Apr 1934 | Box 136 \ 4 scan0080 | |
| Letter from Burgess Products Company arranging a meeting regarding the 'Mono-Drive' transmission. | 24th Apr 1934 | Box 136 \ 4 scan0081 | |
| Attaching a copy of I.A.E. Research and Standardisation Committee Report No. 7064. | 23th Apr 1934 | Box 136 \ 4 scan0082 | |
| Research document summarizing tests on 'spoked' phenolic laminated gears to assess noise, resilience, and shock resistance. | 1st Mar 1934 | Box 136 \ 4 scan0083 | |
| Observations on American gearboxes, specifically from Cadillac and Lincoln. | 27th Apr 1934 | Box 136 \ 4 scan0084 | |
| Delay in the production of the E.N.V. 'Wilson' Epicyclic Box for an experiment. | 27th Apr 1934 | Box 136 \ 4 scan0085 | |
| Extract from the 'Commerce' magazine describing a new automatic transmission device called MONO-DRIVE. | 1st Jan 1933 | Box 136 \ 4 scan0086 | |
| Description of the MONO-DRIVE automatic transmission system and its commercial application in a streamlined Rail-Plane. | 24th Apr 1934 | Box 136 \ 4 scan0087 | |
| Letter to Ford Motor Co. asking for information on American gear steels, their suppliers, and heat treatment specifications. | 24th Apr 1934 | Box 136 \ 4 scan0088 | |
| Letter from Ford Motor Company acknowledging a request for information on American gear steels and Lincoln car ventilators. | 27th Apr 1934 | Box 136 \ 4 scan0089 | |
| Letter from Ford Motor Company detailing the chemical composition analysis of various American gear steels. | 3rd May 1934 | Box 136 \ 4 scan0090 | |
| Page 2 of a letter from Ford Motor Company detailing steel composition and heat treatment recommendations. | 3rd May 1934 | Box 136 \ 4 scan0091 | |
| Letter from Ford Motor Company regarding the analysis and composition of American gear steels. | 3rd May 1934 | Box 136 \ 4 scan0092 | |
| Letter from Ford Motor Company discussing steel composition and various heat treatment recommendations. | 3rd May 1934 | Box 136 \ 4 scan0093 | |
| Letter to Ford Motor Co. Ltd. regarding steel gears, cyaniding, and Aerolite pistons. | 7th May 1934 | Box 136 \ 4 scan0094 | |
| Letter to Brayshaw Furnaces & Tools Ltd. requesting cyanide hardening services for experimental gearbox gears, including material specifications and current heat treatment. | 8th May 1934 | Box 136 \ 4 scan0095 | |
| Letter specifying the heat treatment process and hardness requirements for gears. | 8th May 1934 | Box 136 \ 4 scan0096 | |
| Letter from Ford Motor Company regarding cyaniding gears, oil consumption, and 'Aerolite' pistons. | 9th May 1934 | Box 136 \ 4 scan0097 | |
| Letter from Brayhsaw Furnaces & Tools, Ltd. regarding the casehardening process for gears. | 11th May 1934 | Box 136 \ 4 scan0098 | |
| Letter from The Bristol Aeroplane Company Ltd regarding the testing of a 'Spontan gear' fitted to a Rover car. | 15th May 1934 | Box 136 \ 4 scan0099 | |
| Letter to Messrs. A.C. Wickman Ltd. arranging a demonstration of the Spontan Gear. | 16th May 1934 | Box 136 \ 4 scan0100 | |
| Follow-up memo requesting the current status of the 'Wilson' Epicyclic Box on the 20/25 model. | 17th May 1934 | Box 136 \ 4 scan0101 | |
| Letter from A. C. Wickman, Ltd. arranging a demonstration of a car fitted with the Spontan gear. | 18th May 1934 | Box 136 \ 4 scan0102 | |
| Letter to Messrs. A.C. Wickman Ltd. confirming a visit to Coventry to try the Spontan gear. | 23th May 1934 | Box 136 \ 4 scan0103 | |
| Letter from A.C. Wickman Ltd. confirming a meeting appointment regarding Spontan Gear. | 25th May 1934 | Box 136 \ 4 scan0104 | |
| Performance and potential power loss of the Wilson Gearbox in a race. | 21th Sep 1934 | Box 136 \ 4 scan0105 | |
| Listing the advantages of an infinitely variable and automatic gear system. | 10th Sep 1934 | Box 136 \ 4 scan0106 | |
| The 4-speed synchromesh gearboxes of Alvis, Hillman, and Humber cars from the 1934 Olympia Motor Show. | 23th Oct 1934 | Box 136 \ 4 scan0107 | |
| Evaluation of vehicle noise levels at different speeds and a design analysis of the gearbox. | 1st Nov 1933 | Box 136 \ 4 scan0108 | |
| Technical comparison and critique of gearbox components and design features for various car models. | 1st Nov 1933 | Box 136 \ 4 scan0109 | |
| Technical analysis document discussing various gearbox components like synchromesh, gears, shafts, and oil grooves. | 1st Nov 1933 | Box 136 \ 4 scan0110 | |
| Potential improvements and considerations for gearbox design, including gears, cams, and synchronisation. | 1st Nov 1933 | Box 136 \ 4 scan0111 | |
| Technical discussion on gearbox design, comparing cone placement on the upper shaft versus the layshaft, and the implications for synchromesh gears. | 24th Oct 1934 | Box 136 \ 4 scan0112 | |
| Sg. to Rm. chasing an update regarding Dr. E. Ivimy Puddy. | 24th Oct 1934 | Box 136 \ 4 scan0113 | |
| Letter from The Cloudsley Engineering Co. Ltd. arranging a telephone call regarding the Hayes Selfselector Transmission. | 26th Oct 1934 | Box 136 \ 4 scan0114 | |
| Letter to Cloudsley Engineering regarding a Hayes gearbox and potential future developments. | 7th Nov 1934 | Box 136 \ 4 scan0115 | |
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