| Description | Date | Identifier | |
| Competitive analysis of a Lagonda car, evaluating its performance and characteristics against Rolls-Royce models. | 23th Jun 1938 | Box 128 \ 1 scan0349 | |
| Letter from coachbuilders Hooper & Co. providing feedback on instrument panel design and discussing a new Mercedes. | 23th Jun 1938 | Box 128 \ 1 scan0350 | |
| Test of Studebaker gear change and overdrive systems for engineering insights. | 24th Jun 1938 | Box 128 \ 1 scan0351 | |
| Studebaker overdrive and gear arrangement compared to a usual setup. | 24th Jun 1938 | Box 128 \ 1 scan0352 | |
| Letter to a coachbuilder discussing instruments and expressing disappointment in Mercedes products. | 27th Jun 1938 | Box 128 \ 1 scan0353 | |
| Letter from coachbuilder Hooper & Co. discussing a Mercedes model and vehicle springing. | 28th Jun 1938 | Box 128 \ 1 scan0354 | |
| Letter to F.L. Manning of Hooper & Co. Coachbuilders regarding the purchase of a 1937 8-cylinder Studebaker. | 20th Jul 1938 | Box 128 \ 1 scan0355 | |
| Advertisement for the 1937 Dodge Touring Sedan with a celebrity testimonial. | 7th Jun 1937 | Box 128 \ 1 scan0356 | |
| Advertisement for the 1937 Dodge, detailing features for comfort, luxury, and a quiet ride. | 7th Jun 1937 | Box 128 \ 1 scan0357 | |
| Promotional sales brochure detailing the features and models of the 1938 Studebaker car range. | 1st Sep 1937 | Box 128 \ 1 scan0358 | |
| Letter from a coachbuilder discussing the sale of a 1937 8-cylinder Studebaker and a re-purchase agreement. | 21th Jul 1938 | Box 128 \ 1 scan0361 | |
| Letter to F.L. Manning of Hooper & Co. regarding further design investigation of a Studebaker. | 22th Jul 1938 | Box 128 \ 1 scan0362 | |
| Letter from coachbuilder Hooper & Co. regarding a vehicle enquiry, price, and availability. | 23th Jul 1938 | Box 128 \ 1 scan0363 | |
| Request to borrow a Cord motor-car to test its speed with a lap at Brooklands. | 1st Sep 1938 | Box 128 \ 1 scan0364 | |
| Letter from Old Hill Motors acknowledging correspondence regarding the loan of a Cord car. | 3rd Sep 1938 | Box 128 \ 1 scan0365 | |
| Letter from Cecil Kimber of The MG Car Company Ltd to W. Robotham proposing a visit to the Derby works and a trip to Donington Park. | 13th Sep 1938 | Box 128 \ 1 scan0366 | |
| Letter to C. Kimber of The M.G. Car Company Ltd. arranging a visit to the works and discussing aviation work. | 14th Sep 1938 | Box 128 \ 1 scan0367 | |
| Letter from The M.G. Car Company Ltd. acknowledging receipt of a letter and advising it will be passed to Mr. Kimber on his return. | 17th Sep 1938 | Box 128 \ 1 scan0368 | |
| Letter to F.L. Manning of Hooper & Co. regarding borrowing a car as Brooklands is closing. | 21th Oct 1938 | Box 128 \ 1 scan0369 | |
| Letter to Count Heyden confirming an invitation to see a 12-cylinder Delahaye car. | 25th Oct 1938 | Box 128 \ 1 scan0370 | |
| Letter from coachbuilder Hooper & Co. to S.H. Grylls regarding the sale of a Cord car and sourcing a replacement. | 28th Oct 1938 | Box 128 \ 1 scan0371 | |
| Letter from the American office about a proposed hydraulic clutch design from an inventor in Chicago. | 19th Dec 1927 | Box 128 \ 2 scan0001 | |
| Letter from the American office describing the features of a new single-plate clutch developed by the Russel Mfg. Company. | 29th Dec 1927 | Box 128 \ 2 scan0002 | |
| Clutch design, focusing on asbestos fabric rings, operating levers, and the development of high-friction fabrics. | 29th Dec 1927 | Box 128 \ 2 scan0003 | |
| Design drawing for a Russel single-plate clutch mechanism and components. | 29th Dec 1927 | Box 128 \ 2 scan0004 | |
| Letter discussing a new Russel single-plate clutch, with attached photographs, and its potential application. | 28th Feb 1928 | Box 128 \ 2 scan0005 | |
| Photograph of a disassembled star-shaped clutch assembly, showing the main plates and associated components. | 28th Feb 1928 | Box 128 \ 2 scan0006 | |
| Photograph of a circular mechanical component with various levers and fittings, and its disassembled parts. | 14th Nov 1930 | Box 128 \ 2 scan0007 | |
| Inquiry about the progress of experiments with Maybach type clutches and helical 3rd speed. | 14th Nov 1930 | Box 128 \ 2 scan0008 | |
| From 'Sg.' to 'Hs.' discussing the trial of a car fitted with a Humfrey-Sandberg Free-Wheel Clutch. | 23th Jan 1931 | Box 128 \ 2 scan0009 | |
| Recommending against testing the Humfrey Sandberg freewheel clutch. | 22th Jan 1931 | Box 128 \ 2 scan0010 | |
| Meeting with Mr. Humfrey regarding a free-wheel clutch attachment for a gearbox. | 24th Jan 1931 | Box 128 \ 2 scan0011 | |
| Follow-up letter from Associated Transmissions Limited regarding an Easy Gear Change system test. | 24th Jan 1931 | Box 128 \ 2 scan0012 | |
| Letter to E. Platford Esq. discussing clutch design, an experimental gearbox, and a replacement Studebaker unit. | 30th Jan 1931 | Box 128 \ 2 scan0013 | |
| Letter from Associated Transmissions Ltd. regarding the fitting of their clutches into a constant mesh third gearbox and requesting a general arrangement of the whole gearbox. | 30th Jan 1931 | Box 128 \ 2 scan0014 | |
| Letter from Associated Transmissions Limited to E. Hives regarding a new infinitely variable inertia gear. | 30th Jan 1931 | Box 128 \ 2 scan0015 | |
| Description of the Humfrey-Sandberg easy gear change unit. | 30th Jan 1931 | Box 128 \ 2 scan0016 | |
| Page 2 of a document describing the operation of a reverse clutch and free-wheel mechanism, referencing drawing H.S.588.L. | 30th Jan 1931 | Box 128 \ 2 scan0017 | |
| Description of the operation of the main and reverse clutch mechanism. | 30th Jan 1931 | Box 128 \ 2 scan0018 | |
| Description of the operational sequence of a clutch pedal, main clutch, reverse clutch, and band brake. | 30th Jan 1931 | Box 128 \ 2 scan0019 | |
| Description of the mechanism and sequence of operations to obtain a free wheel drive. | 30th Jan 1931 | Box 128 \ 2 scan0020 | |
| Page detailing the operation of the clutch pedal, free wheel operation, and band brake adjustment. | 21th Jan 1931 | Box 128 \ 2 scan0021 | |
| Page 7 of a document describing the brake operation relative to an operating sleeve, with a handwritten note about a clutch drawing. | 21th Jan 1931 | Box 128 \ 2 scan0022 | |
| Letter to Associated Transmissions Ltd. enclosing a general arrangement drawing of a gear-box. | 6th Feb 1931 | Box 128 \ 2 scan0023 | |
| Letter from Associated Transmissions Limited regarding a scheme for embodying Humfrey-Sandberg clutches in a constant mesh third gearbox. | 6th Feb 1931 | Box 128 \ 2 scan0024 | |
| Letter from Associated Transmissions Ltd. regarding a scheme for a unit of controls and clutches. | 9th Feb 1931 | Box 128 \ 2 scan0025 | |
| Forwarding a scheme from Humfrey-Sandberg for fitting their clutch into a 40/50 gearbox. | 9th Feb 1931 | Box 128 \ 2 scan0026 | |
| Correspondence with Associated Transmissions Ltd. regarding a free-wheel design for a gearbox. | 9th Feb 1931 | Box 128 \ 2 scan0027 | |
| Letter to Associated Transmissions Ltd. requesting copies of a scheme for clutches for a constant mesh helical 3rd speed gear. | 13th Feb 1931 | Box 128 \ 2 scan0028 | |
| Telex message requesting a print of a scheme for a box be sent to Hives in Derby. | 13th Feb 1931 | Box 128 \ 2 scan0029 | |
| Letter from Associated Transmissions Ltd. confirming receipt of a telegram and enclosing two blueprints and descriptions for a scheme. | 13th Feb 1931 | Box 128 \ 2 scan0030 | |
| Letter from Associated Transmissions Limited to Mr. Hives regarding a gear matter and arranging a visit. | 13th Feb 1931 | Box 128 \ 2 scan0031 | |
| Letter from Associated Transmissions Limited acknowledging a request and confirming prints were sent. | 14th Feb 1931 | Box 128 \ 2 scan0032 | |
| Letter to Col. The Master of Sempill politely declining to consider new schemes from Associated Transmissions, Ltd. at the present time. | 14th Feb 1931 | Box 128 \ 2 scan0033 | |
| Description of Humfrey-Sandberg clutches fitted to a gearbox. | 6th Feb 1931 | Box 128 \ 2 scan0034 | |
| Technical memorandum detailing modifications to a gearbox, including clutches, shafts, and gear arrangements. | 6th Feb 1931 | Box 128 \ 2 scan0035 | |
| Scheme for a Humfrey-Sandberg clutch for top and third easy engagement. | 18th Feb 1931 | Box 128 \ 2 scan0036 | |
| Trip to evaluate a Maybach car and its clutch technology. | 18th Feb 1931 | Box 128 \ 2 scan0037 | |
| Observations on the difficulties and possible remedies for a Maybach-style dog clutch transmission system. | 20th Feb 1931 | Box 128 \ 2 scan0038 | |
| Transmission issues including clutch engagement, gear changes, and control levers. | 23th Feb 1931 | Box 128 \ 2 scan0039 | |
| Visit to the Berlin Motor Show to trial Maybach cars and the issues with fitting Maybach clutches to a 14-EX car. | 23th Feb 1931 | Box 128 \ 2 scan0040 | |
| Modifications to Maybach dogs on the epicyclic 3rd speed gearbox to prevent a clicking sound. | 23th Feb 1931 | Box 128 \ 2 scan0041 | |
| Requesting the production and fitting of modified Maybach gear dogs and adjustments to the selector mechanism for vehicle 14-EX. | 26th Feb 1931 | Box 128 \ 2 scan0042 | |
| The initial tests and issues with Maybach dogs on the 14-EX gearbox. | 26th Feb 1931 | Box 128 \ 2 scan0043 | |
| Analysis of transmission jerks and crashes during gear changes, particularly in 3rd and top gear. | 26th Feb 1931 | Box 128 \ 2 scan0044 | |
| Troubleshooting and modifying a gear change mechanism to fix clicking and engagement issues. | 26th Feb 1931 | Box 128 \ 2 scan0045 | |
| Discussion with Dr. Maybach regarding the design and performance of a dog clutch mechanism. | 2nd Mar 1931 | Box 128 \ 2 scan0046 | |
| Maybach gearbox changes, including a diagram of a four-speed silent gearbox. | 2nd Mar 1931 | Box 128 \ 2 scan0047 | |
| Cross-section diagram and gear ratio table for a Maybach transmission for large vehicles. | 2nd Mar 1931 | Box 128 \ 2 scan0048 | |
| The trial of a Maybach car in Berlin, focusing on the 4-speed silent gearbox. | 2nd Mar 1931 | Box 128 \ 2 scan0049 | |
| Road test report evaluating the gearbox, engine, steering, and brakes of a vehicle. | 2nd Mar 1931 | Box 128 \ 2 scan0050 | |
| Summary memo discussing the merits of purchasing a Maybach car or gearbox for evaluation. | 2nd Mar 1931 | Box 128 \ 2 scan0051 | |
| Gear change issues, comparing Maybach jaws with Salerni baulk rings and other proposed gearbox schemes. | 2nd Mar 1931 | Box 128 \ 2 scan0052 | |
| Modifications to Maybach dogs, referencing Chrysler box designs and suggesting trials on the 14-EX model. | 2nd Mar 1931 | Box 128 \ 2 scan0053 | |
| Technical discussion on resolving accidental crashing with hand-controlled Maybach dogs by modifying gear face angles and corner radii. | 3rd Mar 1931 | Box 128 \ 2 scan0054 | |
| Technical report on gearbox operation, detailing gear changing procedures and potential improvements. | 3rd Mar 1931 | Box 128 \ 2 scan0055 | |
| Modifications to the Maybach jaws on an epicyclic 3rd speed gearbox following experience driving the 14-EX. | 3rd Mar 1931 | Box 128 \ 2 scan0056 | |
| Results of a Maybach car trial and the potential purchase of its gearbox for a Phantom II model. | 4th Mar 1931 | Box 128 \ 2 scan0057 | |
| Design possibilities of a change gear using Maybach jaws and Salerni rings. | 6th Mar 1931 | Box 128 \ 2 scan0058 | |
| Internal memorandum discussing the development and testing of an easy-change gearbox, comparing a Maybach system with a Daimler fluid flywheel system. | 6th Mar 1931 | Box 128 \ 2 scan0059 | |
| Letter from Ernst Schneider regarding particulars for the Maybach Gear Box DSG 80. | 9th Mar 1931 | Box 128 \ 2 scan0060 | |
| Translated letter from Maybach-Motorenbau regarding a quotation for a DSG 80 gearbox. | 11th Mar 1931 | Box 128 \ 2 scan0061 | |
| Letter from Maybach-Motorenbau regarding a Maybach-Getriebe DSG 80. | 11th Mar 1931 | Box 128 \ 2 scan0062 | |
| Meeting report on the trial of a Maybach clutch system and Daimler car components. | 13th Mar 1931 | Box 128 \ 2 scan0063 | |
| Meeting notes discussing tests and development for gearboxes, fumes, and shock absorbers. | 13th Jan 1931 | Box 128 \ 2 scan0064 | |
| Meeting minutes discussing Phantom II subframes, starter issues, the Young battery, and Japan III costs. | 18th Jan 1931 | Box 128 \ 2 scan0065 | |
| Potential crashing engagements in the Maybach vacuum control change gear and a proposed interlock solution. | 14th Mar 1931 | Box 128 \ 2 scan0066 | |
| Letter to Maybach regarding gearbox development, specifically a 'crashing engagement' issue, and the question of royalties. | 16th Mar 1931 | Box 128 \ 2 scan0067 | |
| Reproducible crash issue within the Maybach change gear vacuum control system. | 16th Mar 1931 | Box 128 \ 2 scan0068 | |
| Letter regarding a Maybach gearbox, enclosing another letter and mentioning an upcoming demonstration of a 'Maybach-Zeppelin' car. | 28th Mar 1931 | Box 128 \ 2 scan0069 | |
| Letter from Maybach explaining operational issues with their gearbox. | 24th Mar 1931 | Box 128 \ 2 scan0070 | |
| Letter from Maybach explaining a now-discontinued device designed to prevent engine overspeed in their gearboxes. | 24th Mar 1931 | Box 128 \ 2 scan0071 | |
| Letter from Maybach-Motorenbau regarding issues with a Maybach gearbox. | 24th Mar 1931 | Box 128 \ 2 scan0072 | |
| Letter from Maybach-Motorenbau discussing technical details of a gearbox, including a jolt issue and a patented device to mitigate it. | 24th Mar 1931 | Box 128 \ 2 scan0073 | |
| Diagram of the Maybach overdrive system (Schnellgang). | 6th Jul 1910 | Box 128 \ 2 scan0074 | |
| Royalty payment proposals from the Maybach Co. for their 'Easy Change Dog' scheme. | 30th Mar 1931 | Box 128 \ 2 scan0075 | |
| Modifications to a gearbox with an epicyclic third speed to reduce noise from the Maybach jaws. | 2nd Apr 1931 | Box 128 \ 2 scan0076 | |
| Letter to Ernest Schneider regarding an offer to test a 'Maybach-Zeppelin' and its gear. | 11th Apr 1931 | Box 128 \ 2 scan0077 | |
| Letter from Ernst Schneider regarding the successful testing of the Maybach Gearbox. | 13th Apr 1931 | Box 128 \ 2 scan0078 | |
| Internal note discussing the license terms proposed by Maybach for their Easy Change System. | 17th Apr 1931 | Box 128 \ 2 scan0079 | |
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