| Description | Date | Identifier | |
| Letter to Toledo Woodhead Springs Ltd. regarding spring interleaving materials, costs, and new Bakelite tips. | 18th Nov 1938 | Box 154 \ 2 scan0168 | |
| Letter to Toledo Woodhead Springs Ltd. regarding pricing for interleaving from Ferodo Ltd. | 18th Nov 1938 | Box 154 \ 2 scan0169 | |
| Letter to John Bull Tyre Rubber Co. Ltd. requesting an estimate for making a small rubber buffer. | 19th Nov 1938 | Box 154 \ 2 scan0170 | |
| The dispatch of spring interleaf tips to Messrs. Ferodo Ltd. for analysis. | 22th Nov 1938 | Box 154 \ 2 scan0171 | |
| Letter to Ferodo Ltd. regarding the supply and analysis of Interleaf tips. | 22th Nov 1938 | Box 154 \ 2 scan0172 | |
| The return of failed spring interleaving material to a supplier for examination. | 22th Nov 1938 | Box 154 \ 2 scan0173 | |
| Letter to Toledo Woodhead Springs Ltd. regarding the examination of failed interleaving from a Bentley. | 22th Nov 1938 | Box 154 \ 2 scan0174 | |
| Letter from Toledo Woodhead Springs Limited acknowledging correspondence regarding interleaving for springs. | 23th Nov 1938 | Box 154 \ 2 scan0175 | |
| Request to manufacture six sleeves to test cheaper silentblocs for the Bentley V and B.50 cars. | 26th Nov 1938 | Box 154 \ 2 scan0176 | |
| Advice note from George Angus & Co., Ltd. regarding the dispatch of various oil seals. | 28th Nov 1938 | Box 154 \ 2 scan0177 | |
| Letter acknowledging an inquiry about spring interleaving and promising to submit samples by early December. | 28th Nov 1938 | Box 154 \ 2 scan0178 | |
| Letter to Ferodo Ltd. arranging a meeting to see new interleaving. | 30th Nov 1938 | Box 154 \ 2 scan0179 | |
| Letter from Ferodo Limited confirming arrangements for a visit and the provision of test samples. | 1st Dec 1938 | Box 154 \ 2 scan0180 | |
| Letter to The John Bull Rubber Co. Ltd. discussing a quotation for bellows and requesting a price for experimental samples. | 2nd Dec 1938 | Box 154 \ 2 scan0181 | |
| Letter to Toledo Woodhead Springs Ltd. arranging a meeting with representatives from Ferodo Ltd. | 3rd Dec 1938 | Box 154 \ 2 scan0182 | |
| Letter from a supplier clarifying a quotation for rubber bellows and proposing a price for experimental samples. | 5th Dec 1938 | Box 154 \ 2 scan0183 | |
| Letter from Toledo Woodhead Springs confirming an appointment at the Ferodo Works. | 5th Dec 1938 | Box 154 \ 2 scan0184 | |
| Letter to Messrs. W. & T. Avery Ltd. requesting details of a spring rate testing machine for chassis suspension springs. | 6th Dec 1938 | Box 154 \ 2 scan0185 | |
| Letter to The John Bull Rubber Co. Ltd. regarding an order for experimental rubber buffers. | 8th Dec 1938 | Box 154 \ 2 scan0186 | |
| Recommending an increase in the stock of rear road springs for Wraith production. | 8th Dec 1938 | Box 154 \ 2 scan0187 | |
| Letter from W. & T. Avery Ltd. acknowledging receipt of a letter and promising a future reply. | 8th Dec 1938 | Box 154 \ 2 scan0188 | |
| Letter to a supplier about the dangerous practice of etching piece numbers on coil road springs for a Bentley. | 9th Dec 1938 | Box 154 \ 2 scan0189 | |
| Letter from John Bull Rubber Co. Ltd. concerning the manufacture of rubber buffers, awaiting the arrival of plates and springs. | 10th Dec 1938 | Box 154 \ 2 scan0190 | |
| Letter from the Experimental Department to Toledo Woodhead Springs Ltd. enquiring about supplies of toughened interleaving for leaf springs. | 10th Dec 1938 | Box 154 \ 2 scan0191 | |
| Order for three pairs of rear springs for a Bentley 50 chassis from Toledo Woodhead's. | 12th Dec 1938 | Box 154 \ 2 scan0192 | |
| Letter from Toledo Woodhead Springs regarding an order for a pair of springs with interleaving. | 12th Dec 1938 | Box 154 \ 2 scan0193 | |
| Letter to Toledo Woodhead Springs Ltd. regarding the supply and specifications of spring interleaving material. | 13th Dec 1938 | Box 154 \ 2 scan0194 | |
| Letter to Messrs. Ferodo Ltd. regarding an order for spring interleaving material, detailing dimensions and correcting a previous order. | 13th Dec 1938 | Box 154 \ 2 scan0195 | |
| Internal request to place an official order with Messrs. Ferodo Ltd. for road spring interleaving. | 13th Dec 1938 | Box 154 \ 2 scan0196 | |
| Letter from Toledo Woodhead Springs regarding a sample cadmium plated leaf spring and pricing. | 15th Dec 1938 | Box 154 \ 2 scan0197 | |
| Letter from Ferodo Limited acknowledging order No. 78805 and confirming delivery arrangements. | 16th Dec 1938 | Box 154 \ 2 scan0198 | |
| Letter from Toledo Woodhead Springs Ltd. regarding an order for springs with special Ferodo interleaving. | 16th Dec 1938 | Box 154 \ 2 scan0199 | |
| Requesting an order be placed for graphite bronze spring interleaving that has already been delivered. | 20th Dec 1938 | Box 154 \ 2 scan0200 | |
| Letter from DuPont offering a sample of 'Orel' Rubber Lubricant for testing. | 21th Dec 1938 | Box 154 \ 2 scan0201 | |
| Letter to W. & T. Avery Ltd. requesting costs for cheaper versions of experimental testing machines. | 21th Dec 1938 | Box 154 \ 2 scan0202 | |
| Letter from W. & T. Avery Ltd. acknowledging a request for a revised quotation from the Testing Machine Department. | 29th Dec 1938 | Box 154 \ 2 scan0203 | |
| Letter to Toledo Woodhead Springs Ltd. regarding a sample cadmium plated leaf spring's finish and price. | 31th Dec 1938 | Box 154 \ 2 scan0204 | |
| Instruction to build a reverse-hand steering box for the American model chassis. | 27th Sep 1919 | Box 154 \ 3 scan0001 | |
| The decision to continue manufacturing right-hand drive chassis for America and halt development of the left-hand drive version. | 31th Oct 1919 | Box 154 \ 3 scan0002 | |
| List of proposed alterations and improvements for the American market Rolls-Royce car. | 2nd Dec 1919 | Box 154 \ 3 scan0003 | |
| Letter from the American branch regarding a broken pendulum steering lever and a heavier replacement. | 26th Apr 1921 | Box 154 \ 3 scan0004 | |
| Alterations and improvements to the steering mechanism on the 40/50 model. | 29th Jan 1923 | Box 154 \ 3 scan0005 | |
| Steering tendency of cars to 'tuck under' when braking, analysing weight distribution and moment of inertia. | 8th Dec 1926 | Box 154 \ 3 scan0006 | |
| Brake proportioning, swerving effects during braking, and proposed cures. | 8th Dec 1926 | Box 154 \ 3 scan0007 | |
| Specifications for various steering systems. | 28th Jan 1927 | Box 154 \ 3 scan0008 | |
| Table detailing specifications for two types of Springfield steering systems. | 28th Jan 1927 | Box 154 \ 3 scan0009 | |
| Reports on steering friction, particularly in cross-steering tube balls, and proposed modifications. | 17th Feb 1927 | Box 154 \ 3 scan0010 | |
| Friction in pivots and the functionality of a hydraulic steering damper, focusing on oil viscosity. | 17th Feb 1927 | Box 154 \ 3 scan0011 | |
| Report discussing damper types, shock absorbers, and modifications to reduce axle friction. | 17th Feb 1927 | Box 154 \ 3 scan0012 | |
| Letter discussing the design and performance of steering worm and nut components, comparing English models to their own. | 11th Mar 1927 | Box 154 \ 3 scan0013 | |
| Polishing methods for worm gears and nuts to prevent sticking, and the development of a steering test rig. | 11th Mar 1927 | Box 154 \ 3 scan0014 | |
| Testing a polished worm steering system, its performance under load, and the effects of various lubricants. | 11th Mar 1927 | Box 154 \ 3 scan0015 | |
| Effect of friction in the steering worm and nut mechanism to prevent joggles and road shocks. | 22th Mar 1927 | Box 154 \ 3 scan0016 | |
| Letter from the American branch to the UK branch discussing steering issues, specifically 'joggles' and sticking after use. | 11th Apr 1927 | Box 154 \ 3 scan0017 | |
| Steering geometry, spring stiffness, and shackle fit in comparison to the Silver Ghost model. | 11th Apr 1927 | Box 154 \ 3 scan0018 | |
| Heavy steering issue and a planned discussion with 'OY'. | 25th Jun 1927 | Box 154 \ 3 scan0019 | |
| Steering improvements on the 18-LF model by adjusting the cross steering tube based on customer complaints and a comparison of UK vs USA conditions. | 30th Jun 1927 | Box 154 \ 3 scan0020 | |
| Cover note from BJ to Hs regarding steering on model 18-LF, enclosing a copy of a letter to Mr. Fuller. | 1st Jul 1927 | Box 154 \ 3 scan0021 | |
| Letter discussing steering improvements, comparing US and UK conditions, and potential modifications. | 5th Jul 1927 | Box 154 \ 3 scan0022 | |
| Concluding page of a letter from B. Johnson to H.J. Fuller regarding direct communication with Springfield. | 1st Jul 1927 | Box 154 \ 3 scan0023 | |
| Steering and silencer issues with the Phantom model in the U.S.A. | 14th Jul 1927 | Box 154 \ 3 scan0024 | |
| Cover letter from BJ enclosing a copy of a letter from Mr. Fuller regarding steering trouble. | 7th Jul 1927 | Box 154 \ 3 scan0025 | |
| Letter from H. J. Fuller in New York to Basil Johnson in London regarding steering trouble and other difficulties. | 6th Jul 1927 | Box 154 \ 3 scan0026 | |
| Steering issues on the Springfield Chassis, focusing on problems with low-pressure tires and potential modifications. | 8th Aug 1927 | Box 154 \ 3 scan0027 | |
| Brake mechanism clanking and issues with exhaust banging related to the governor and throttle control. | 8th Aug 1927 | Box 154 \ 3 scan0028 | |
| Page 3 of a technical document discussing the benefits of a specific feature and the best combination for high-class engines. | 1st Aug 1927 | Box 154 \ 3 scan0029 | |
| Investigation into an American complaint about steering stiffening on 40/50 HP models. | 1st Aug 1927 | Box 154 \ 3 scan0030 | |
| The sticking and tightening of worm and nut components, detailing the effects of temperature and various lubricants. | 1st Aug 1927 | Box 154 \ 3 scan0031 | |
| Report differentiating between 'sticking' and 'heavy' steering, discussing load, tyres, and steering ratios. | 1st Aug 1927 | Box 154 \ 3 scan0032 | |
| 'heavy steering' complaints and ongoing investigations into steering problems. | 12th Aug 1927 | Box 154 \ 3 scan0033 | |
| Steering tests carried out on vehicle 9-EX to investigate steering box oil temperatures. | 12th Aug 1927 | Box 154 \ 3 scan0034 | |
| Letter from the American office to Derby regarding steering box temperature tests and issues on Silver Ghost and Phantom models. | 25th Aug 1927 | Box 154 \ 3 scan0035 | |
| Letter from Maurice Olley discussing steering improvements on Phantom and Silver Ghost models. | 25th Aug 1927 | Box 154 \ 3 scan0036 | |
| Letter from the Springfield, Mass. office to Derby, England, discussing a mystery surrounding a steering component's performance. | 30th Aug 1927 | Box 154 \ 3 scan0037 | |
| Scheme for a shorter pendulum lever for the Phantom steering system to help with parking. | 9th Sep 1927 | Box 154 \ 3 scan0038 | |
| Letter detailing the results of tests on tire friction and steering torque on various road surfaces. | 15th Sep 1927 | Box 154 \ 3 scan0039 | |
| Letter discussing steering performance issues, including temperature, friction, and component manufacturing. | 20th Sep 1927 | Box 154 \ 3 scan0040 | |
| Letter from Rolls-Royce of America regarding steering tests and the performance of different lubricants. | 22th Sep 1927 | Box 154 \ 3 scan0041 | |
| Graph comparing steering wheel torque to rocking shaft torque using different lubricants at various temperatures. | 9th Jun 1927 | Box 154 \ 3 scan0042 | |
| Letter from Rolls-Royce of America detailing steering efficiency tests and road reports for various vehicles. | 24th Sep 1927 | Box 154 \ 3 scan0043 | |
| Letter concluding a diagnosis of a steering problem, attributing it to the ball joints or king pins. | 24th Sep 1927 | Box 154 \ 3 scan0044 | |
| Graph of torque on front wheels versus tangential pull on the steering wheel for various chassis. | 22th Sep 1927 | Box 154 \ 3 scan0045 | |
| Bethlehem Torque Amplifier, its application in power-steering, and its origins in military technology. | 24th Oct 1927 | Box 154 \ 3 scan0046 | |
| The testing of an experimental passenger car steering system fitted to a Buick and a discussion of ideal steering ratios. | 24th Oct 1927 | Box 154 \ 3 scan0047 | |
| Letter discussing amplifier brakes, high-speed wobble, and a 'Lashlock' device. | 24th Oct 1927 | Box 154 \ 3 scan0048 | |
| 'Bethlehem Torque Amplifier' and its potential application for power steering in vehicles. | 24th Oct 1927 | Box 154 \ 3 scan0049 | |
| Analysis of steering performance, its faults, and a discussion on potential improvements and ideal ratios. | 24th Oct 1927 | Box 154 \ 3 scan0050 | |
| The third page of a typed letter signed by Maurice Olley regarding a drawing of a device. | 25th Oct 1927 | Box 154 \ 3 scan0051 | |
| Letter to Mr. Basil Johnson detailing the 'Lashlock' device and its applications. | 25th Oct 1927 | Box 154 \ 3 scan0052 | |
| Page 2 of a letter discussing applications for silent chain drives, machine tools, and bevel and sector steering. | 25th Oct 1927 | Box 154 \ 3 scan0053 | |
| Letter from Rolls-Royce of America describing the 'Lashlock' device, its mechanism, and potential applications. | 25th Oct 1927 | Box 154 \ 3 scan0054 | |
| Letter discussing an experimental project by General Motors and plans to inform Mr. Royce. | 28th Oct 1927 | Box 154 \ 3 scan0055 | |
| Letter discussing prints for steering components, steering ratios, and the introduction of hydraulic assisted steering. | 28th Oct 1927 | Box 154 \ 3 scan0056 | |
| Page 2 of a letter from Maurice Olley regarding Mr. Nieman's proposal for a bevel and sector steering device. | 4th Nov 1927 | Box 154 \ 3 scan0057 | |
| Specifications and recommendations for a Bethlehem torque-amplified steering system. | 4th Nov 1927 | Box 154 \ 3 scan0058 | |
| Letter offering to supply and install a steering control for testing purposes without obligation. | 4th Nov 1927 | Box 154 \ 3 scan0059 | |
| Reprint from American Machinist detailing the Bethlehem Torque Amplifier and Lashlock systems for eliminating backlash. | 4th Nov 1927 | Box 154 \ 3 scan0060 | |
| The Bethlehem mechanical torque amplifier, a device for precise control of mechanical motions. | 26th Nov 1923 | Box 154 \ 3 scan0061 | |
| Article discussing mechanical torque amplifiers and the Bethlehem Lashlock for backlash elimination. | 26th Nov 1923 | Box 154 \ 3 scan0062 | |
| Technical explanation and diagrams of a 'lashlock' mechanism and its application in a torque amplifier. | 12th Apr 1928 | Box 154 \ 3 scan0063 | |
| | | | |
