| Description | Date | Identifier | |
| Testing of an automatic overdrive gearbox from a Studebaker and plans for fitting it to a car. | 26th Jan 1939 | Box 136 \ 2 scan0025 | |
| Letter to David Brown & Sons requesting a quote for cutting teeth on an experimental cluster gear layshaft. | 20th Jan 1939 | Box 136 \ 2 scan0026 | |
| Letter from Super Oil Seals & Gaskets Ltd. regarding an order for Oil Seals No. 225116. | 27th Jan 1939 | Box 136 \ 2 scan0027 | |
| Letter from David Brown & Sons regarding the feasibility and cost of cutting gear teeth from drawing GB.4614. | 27th Jan 1939 | Box 136 \ 2 scan0028 | |
| Letter to Ransome & Marles Bearing Co. Ltd. requesting an experimental gearbox assembly. | 27th Jan 1939 | Box 136 \ 2 scan0029 | |
| Letter from The Moss Gear Co. Ltd. declining to quote for cutting teeth on an experimental cluster gear layshaft. | 27th Jan 1939 | Box 136 \ 2 scan0030 | |
| Letter to a supplier regarding materials for an oil seal, rejecting synthetic rubber in favour of chrome leather. | 28th Jan 1939 | Box 136 \ 2 scan0031 | |
| The dispatch of blueprints for a backing strip to improve fan performance at low speeds. | 1st Feb 1939 | Box 136 \ 2 scan0032 | |
| Letter to Hoffmann Manufacturing requesting sample bearings with minimum endwise slack for gearbox testing. | 1st Feb 1939 | Box 136 \ 2 scan0033 | |
| Parts list for 1st, 2nd, and 3rd motion shaft assemblies. | 1st Feb 1939 | Box 136 \ 2 scan0034 | |
| Letter from David Brown & Sons regarding the cutting of teeth on drawing GB.4614. | 1st Feb 1939 | Box 136 \ 2 scan0035 | |
| Advice note from Ransome & Marles Bearing Co. Ltd. detailing a consignment. | 2nd Feb 1939 | Box 136 \ 2 scan0036 | |
| Letter to David Brown & Sons Ltd. regarding a specification change for steel shafts for gear cutting. | 2nd Feb 1939 | Box 136 \ 2 scan0037 | |
| Letter from Ransome & Marles Bearing Co. about a Duplex Bearing and gearbox components. | 2nd Feb 1939 | Box 136 \ 2 scan0038 | |
| Trial of a De Normanville overdrive gearbox as a potential replacement for the Warner box. | 2nd Feb 1939 | Box 136 \ 2 scan0039 | |
| Covering order for DMJT bearings from Messrs. Ransome & Marles. | 3rd Feb 1939 | Box 136 \ 2 scan0040 | |
| Letter to Messrs. Ransome & Marles Bearing Co. Ltd. requesting a specific bearing for an experiment. | 3rd Feb 1939 | Box 136 \ 2 scan0041 | |
| Agreeing to obtain a De Normanville overdrive gearbox for testing. | 2nd Feb 1939 | Box 136 \ 2 scan0042 | |
| Thank you letter from the Managing Director of Overdrive Gears Ltd. following a visit. | 3rd Feb 1939 | Box 136 \ 2 scan0043 | |
| Modification to a B.5 and B.50 gearbox second motion shaft. | 4th Feb 1939 | Box 136 \ 2 scan0044 | |
| Letter from Hoffmann Manufacturing concerning bearing clearances, specifications, and supply for gearboxes. | 4th Feb 1939 | Box 136 \ 2 scan0045 | |
| Modifications to gearbox actuating forks, fitting them with axial roller bearings for testing purposes. | 6th Feb 1939 | Box 136 \ 2 scan0046 | |
| Confidential information extracted from Humber regarding the De Normanville Overdrive gearbox. | 7th Feb 1939 | Box 136 \ 2 scan0047 | |
| Technical discussion on the reliability and design limitations of the De Normanville overdrive system. | 9th Feb 1939 | Box 136 \ 2 scan0048 | |
| Letter to Overdrive Gears Ltd. regarding drawings for an overdrive test and future production discussions. | 10th Feb 1939 | Box 136 \ 2 scan0049 | |
| Letter from Overdrive Gears Ltd. regarding a delayed response due to a director's absence. | 15th Feb 1939 | Box 136 \ 2 scan0050 | |
| Order for Hoffmanns bearings and listing other bearings requiring orders. | 20th Feb 1939 | Box 136 \ 2 scan0051 | |
| Letter from Overdrive Gears Ltd. to S. H. Grylls proposing a meeting to discuss commercial arrangements. | 21th Feb 1939 | Box 136 \ 2 scan0052 | |
| Short confirmation telex regarding a meeting on Thursday morning. | 22th Feb 1939 | Box 136 \ 2 scan0053 | |
| Letter proposing a joint patent for the elongation of holes in cages to prevent cage failures. | 22th Feb 1939 | Box 136 \ 2 scan0054 | |
| Confirming a telephone order for six oil seals from The Super Oil Seal Manufacturing Co. | 28th Feb 1939 | Box 136 \ 2 scan0055 | |
| Packing note for the dispatch of six chrome oil seals. | 28th Feb 1939 | Box 136 \ 2 scan0056 | |
| Letter from Overdrive Gears Ltd. proposing a revised schedule of royalties. | 1st Mar 1939 | Box 136 \ 2 scan0057 | |
| Letter to E.J. de Normanville of Overdrive Gears Ltd. acknowledging his letter and explaining a delay in response. | 2nd Mar 1939 | Box 136 \ 2 scan0058 | |
| The use of hard steel pads in the manufacture of aluminium bronze gearbox forks. | 9th Sep 1939 | Box 136 \ 2 scan0059 | |
| Letter from Paul Quinn Ltd. regarding a sample of HIBUDINE synthetic rubber for oil seals. | 10th Mar 1939 | Box 136 \ 2 scan0060 | |
| The feasibility of incorporating steel pads into gearbox forks during the casting process. | 10th Mar 1939 | Box 136 \ 2 scan0061 | |
| Letter to Paul Quinn Ltd. acknowledging receipt of a sample oil seal and discussing material. | 13th Mar 1939 | Box 136 \ 2 scan0062 | |
| Invoices from Super Oil Seals & Gaskets Ltd. and seeking authorisation for payment. | 14th Mar 1939 | Box 136 \ 2 scan0063 | |
| Letter from Super Oil Seals & Gaskets Ltd. regarding an invoice for three oil seals and their delivery. | 6th Mar 1939 | Box 136 \ 2 scan0064 | |
| Letter to Ransome & Marles Bearing Co. Ltd. requesting two LJ.45 bearings for experimental purposes. | 15th Mar 1939 | Box 136 \ 2 scan0065 | |
| Requesting an order for two LJ.45 experimental bearings from Ransome & Marles Bearing Co. Ltd. | 15th Mar 1939 | Box 136 \ 2 scan0066 | |
| Proposed gearbox fork design and requesting a sample before proceeding with die sinking. | 15th Mar 1939 | Box 136 \ 2 scan0067 | |
| Official order for two types of oil seals from Super Oil Seals & Gaskets Ltd. | 17th Mar 1939 | Box 136 \ 2 scan0068 | |
| Advice note from Ransome & Marles Bearing Co. Ltd. detailing goods dispatched. | 20th Mar 1939 | Box 136 \ 2 scan0069 | |
| Letter from Ransome & Marles Bearing Co. regarding the elongation of holes in bearing cages and misalignment. | 28th Mar 1939 | Box 136 \ 2 scan0070 | |
| Letter from Ransome & Marles Bearing Co. Ltd. discussing bearing separator design and patents. | 28th Mar 1939 | Box 136 \ 2 scan0071 | |
| Letter from Ransome & Marles Bearing Co. Ltd. regarding the supply and performance of bearings. | 28th Mar 1939 | Box 136 \ 2 scan0072 | |
| Comparison of BHP loss in a gearbox due to churning of gears at different oil temperatures. | 31th Mar 1939 | Box 136 \ 2 scan0073 | |
| Letter from Overdrive Gears Ltd. regarding oil suitability for an overdrive gearbox and hydraulic operation. | 31th Mar 1939 | Box 136 \ 2 scan0074 | |
| Letter to Captain de Normanville of Overdrive Gears Ltd. regarding the use of SAE.30 engine oil for gearbox lubrication. | 1st Apr 1939 | Box 136 \ 2 scan0075 | |
| Drawing PD.414, showing a .035 correction for the 1st and Reverse gears on the B.V. B.50 and Silver Wraith gearbox. | 5th Apr 1939 | Box 136 \ 2 scan0076 | |
| Letter from Automotive Products Company Ltd regarding the return of assembled Axial Roller Bearings and Selector Gear parts. | 17th Apr 1939 | Box 136 \ 2 scan0077 | |
| Suggestion for the B.V. and B.50 gearbox, detailing changes to cone and cam angles to prevent a pressed-on cone from coming off. | 17th Apr 1939 | Box 136 \ 2 scan0078 | |
| Letter from Overdrive Gears Ltd. discussing an alternative royalty fee basis for smaller car chassis. | 19th Apr 1939 | Box 136 \ 2 scan0079 | |
| Letter to Overdrive Gears Ltd. discussing royalty figures and competitive strategy for various engine sizes. | 20th Apr 1939 | Box 136 \ 2 scan0080 | |
| New combined dipstick and oil filler plug for a gearbox. | 22th Apr 1939 | Box 136 \ 2 scan0081 | |
| Charge for special bearings and a request to book them into stores for payment processing. | 22th Apr 1939 | Box 136 \ 2 scan0082 | |
| Request for a layout of a rig for testing the strength and durability of gearbox gear teeth. | 24th Apr 1939 | Box 136 \ 2 scan0083 | |
| The booking in of 3 special bearings received from Ransome & Marles Bearing Co. Ltd. | 25th Apr 1939 | Box 136 \ 2 scan0084 | |
| The order of Duplex bearings for Bentley gearboxes. | 3rd May 1939 | Box 136 \ 2 scan0085 | |
| Notification regarding blueprints for a combined dip stick, breather, and filler plug for models B.5 and B.50. | 6th May 1939 | Box 136 \ 2 scan0086 | |
| Letter from Overdrive Gears Ltd. to W. A. Robotham discussing an alternative licence fee proposal. | 25th Apr 1939 | Box 136 \ 2 scan0087 | |
| Alternative royalty basis and schedule of licence fees for a chassis. | 15th May 1939 | Box 136 \ 2 scan0088 | |
| The combined filler, breather, and dip stick for the B.5 and B.50 gearbox. | 15th May 1939 | Box 136 \ 2 scan0089 | |
| Correcting an order for bearings from Ransome & Marles. | 18th May 1939 | Box 136 \ 2 scan0090 | |
| Letter from Overdrive Gears Ltd. outlining suggestions for improved production and cost reduction of a gearing system. | 19th May 1939 | Box 136 \ 2 scan0091 | |
| Page 2 of a letter discussing gearing modifications and a licensing fee scheme for larger cars. | 5th Aug 1939 | Box 136 \ 2 scan0092 | |
| Cross-section drawing of an overdrive gear assembly. | 5th Aug 1939 | Box 136 \ 2 scan0093 | |
| Confirming modifications for the production of 300 B.V. gearbox sets. | 2nd May 1939 | Box 136 \ 2 scan0094 | |
| Alteration of a second speed cam angle for gearbox no. 9.B.5. | 23th May 1939 | Box 136 \ 2 scan0095 | |
| Requesting a gear change on a dynamometer axle for testing a new gearbox. | 31th May 1939 | Box 136 \ 2 scan0096 | |
| Letter to Overdrive Gears Ltd. suspending work on their overdrive scheme, comparing it unfavourably to a General Motors alternative. | 2nd Jun 1939 | Box 136 \ 2 scan0097 | |
| Letter from Overdrive Gears Ltd. discussing royalty terms and licensing for different chassis models. | 2nd Jun 1939 | Box 136 \ 2 scan0098 | |
| Page 2 of a letter suggesting a different price and noting a delay due to an uncompleted licence form. | 9th Jun 1939 | Box 136 \ 2 scan0099 | |
| Letter from Overdrive Gears Ltd. discussing licence proposals and the technical merits of their overdrive system. | 9th Jun 1939 | Box 136 \ 2 scan0100 | |
| Letter discussing and comparing overdrive gear ratios, tractive effort, and performance characteristics for various vehicles. | 9th Jun 1939 | Box 136 \ 2 scan0101 | |
| Typed letter with postscripts discussing planet gear specifications. | 9th Jun 1939 | Box 136 \ 2 scan0102 | |
| Performance graph for an 'Overdrive Snipe' with a 4.54 axle, showing curves for Top Gear, Overdrive, and B.HP required. | 10th Jun 1939 | Box 136 \ 2 scan0103 | |
| Letter to Overdrive Gears Ltd. returning a B.HP Required Diagram. | 10th Jun 1939 | Box 136 \ 2 scan0104 | |
| Ordering of steel cage side shaft roller bearings for B.V. gearboxes. | 12th Jun 1939 | Box 136 \ 2 scan0105 | |
| Letter from Paul Quinn Ltd. regarding the price and suitability of synthetic rubber versus natural rubber. | 13th Jun 1939 | Box 136 \ 2 scan0106 | |
| Letter from Paul Quinn Ltd. awaiting test results on a seal and discussing pricing philosophy. | 13th Jun 1939 | Box 136 \ 2 scan0107 | |
| Pros and cons of oil-operated versus vacuum-operated gearbox remote control systems. | 13th Jun 1939 | Box 136 \ 2 scan0108 | |
| Two potential schemes for transmission improvement: an oil relay clutch and a vacuum-assisted gear change. | 13th Jun 1939 | Box 136 \ 2 scan0109 | |
| Letter to Messrs. Paul Quinn Ltd. clarifying a misunderstanding about oil seals and the company's policy against using non-standard components. | 14th Jun 1939 | Box 136 \ 2 scan0110 | |
| Personal letter from Edgar de Normanville to W.A. Robotham regarding a potential misunderstanding over negotiations. | 16th Jun 1939 | Box 136 \ 2 scan0111 | |
| Invoice and credit note discrepancy for a gearbox assembly from E.H. Pickford & Co. Ltd. | 16th Jun 1939 | Box 136 \ 2 scan0112 | |
| Personal letter to Mr. de Normanville discussing royalties, synchromesh transmissions, and technical expediency. | 17th Jun 1939 | Box 136 \ 2 scan0113 | |
| Programme to address issues with an all-helical gearbox. | 19th Jun 1939 | Box 136 \ 2 scan0114 | |
| Request for payment for dismantling, reassembling, and return carriage for a loaned gearbox. | 20th Jun 1939 | Box 136 \ 2 scan0115 | |
| Personal letter from Edgar de Normanville to W.A. Robotham regarding a business relationship and licence problem. | 21th Jun 1939 | Box 136 \ 2 scan0116 | |
| Letter from Overdrive Gears Ltd. confirming a fixed licence fee of 15 shillings per unit, irrespective of vehicle size or torque. | 21th Jun 1939 | Box 136 \ 2 scan0117 | |
| Letter to E. de Normanville acknowledging his letter regarding royalties and the overdrive project. | 22th Jun 1939 | Box 136 \ 2 scan0118 | |
| Letter from British Timken Limited confirming an order for six bearings No. 25580/25520. | 23th Jun 1932 | Box 136 \ 2 scan0119 | |
| Advice note from Ransome & Marles Bearing Co. Ltd for the dispatch of 60 steel rollers. | 24th Jun 1939 | Box 136 \ 2 scan0120 | |
| Confirming a telephone order for 60 rollers from Messrs. Ransome & Marles and requesting a covering order. | 24th Jun 1939 | Box 136 \ 2 scan0121 | |
| Covering order for bearings for an experimental gearbox. | 24th Jun 1939 | Box 136 \ 2 scan0122 | |
| Clutch housing modification to prevent the top gear from jumping out of mesh. | 24th Jun 1939 | Box 136 \ 2 scan0123 | |
| Internal memorandum requesting a covering order for bearings from British Timken Ltd. | 26th Jun 1939 | Box 136 \ 2 scan0124 | |
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