| Description | Date | Identifier | |
| Mr. Royce's suggestion to reduce servo power on the 20 HP model by modifying the cam angle. | 20th Aug 1925 | Box 105 \ 4 scan0021 | |
| Rattle on the 20 HP car with four-wheel brakes, stressing it must be fixed before customer delivery. | 25th Aug 1925 | Box 105 \ 4 scan0022 | |
| Modifications to address 'servo jaggers' on 20 HP and 40/50 models. | 25th Aug 1925 | Box 105 \ 4 scan0023 | |
| Report on tests investigating a rattle from the servo gears on a 20 HP car. | 1st Sep 1925 | Box 105 \ 4 scan0024 | |
| Servo gear rattling issues on chassis 9-G-111 under various driving conditions. | 27th Aug 1925 | Box 105 \ 4 scan0025 | |
| Tests to determine the amount of damping required to stop a rattle in a servo drum. | 1st Sep 1925 | Box 105 \ 4 scan0026 | |
| Performance of a cam for four-wheel brakes on car GOS.111 in France. | 1st Sep 1925 | Box 105 \ 4 scan0027 | |
| Responding to queries on brake adjustments, servo engagement, and braking distribution for 'Phantom' and 'India' models. | 16th Sep 1925 | Box 105 \ 4 scan0028 | |
| Servo and steering issues on the 'India' chassis, specifically car 9-G-111. | 25th Sep 1925 | Box 105 \ 4 scan0029 | |
| Delivery of 'India' chassis, related criticisms, faults, and a modified front axle design. | 5th Oct 1925 | Box 105 \ 4 scan0030 | |
| Introducing flexibility to the servo operating mechanism to resolve braking issues on 'India' and 'Phantom' cars. | 9th Oct 1925 | Box 105 \ 4 scan0031 | |
| Efficiency of servos, an issue on car 103-MC, and the recommendation to measure it. | 16th Nov 1925 | Box 105 \ 4 scan0032 | |
| The causes and cures for 'servo jaggers'. | 12th Jun 1925 | Box 105 \ 4 scan0033 | |
| Broken servo bushes on model 9.G.III and a proposal for a thicker replacement. | 9th Dec 1925 | Box 105 \ 4 scan0034 | |
| Broken dowel bushes on an experimental car's India Servos and the recommended design alteration. | 9th Dec 1925 | Box 105 \ 4 scan0035 | |
| Seeking clarification on the lubrication scheme for the India Gearbox servo drive. | 14th Dec 1925 | Box 105 \ 4 scan0036 | |
| Unsuccessful test to fix 'servo jaggers' and a new recommendation involving flexibility in the servo engagement. | 16th Dec 1925 | Box 105 \ 4 scan0037 | |
| Inquiring about a scheme to introduce flexibility to prevent 'servo jaggers'. | 1st Jan 1926 | Box 105 \ 4 scan0038 | |
| Experiments to resolve 'servo jagger' issues in the braking system. | 1st May 1926 | Box 105 \ 4 scan0039 | |
| 'Servo Jaggers' and the necessity of the Phantom rubber washer, proposing a steel alternative for permanency. | 22th Apr 1926 | Box 105 \ 4 scan0040 | |
| From BJ to Hs regarding the testing, production, and repair use of a scheme related to servo jaggers and a rubber washer. | 5th May 1926 | Box 105 \ 4 scan0041 | |
| Issue known as 'servo jaggers', recommending a rubber washer as a fix. | 8th May 1926 | Box 105 \ 4 scan0042 | |
| Confirming a telegram about vehicle faults and discussing servo braking modifications. | 15th May 1926 | Box 105 \ 4 scan0043 | |
| Modifications and troubleshooting for gears, worms, splines, and damping segments. | 15th May 1926 | Box 105 \ 4 scan0044 | |
| Technical discussion on friction dampers and front spring settings, including camber and frame height. | 15th May 1926 | Box 105 \ 4 scan0045 | |
| Potential improvements to vehicle braking, suspension, and servo design. | 26th May 1926 | Box 105 \ 4 scan0046 | |
| Design and performance improvements for bonnet shutters, engine, servo, and steering. | 26th May 1926 | Box 105 \ 4 scan0047 | |
| Scheme 2196, showing flexibility in the 20HP servo gear operation and an increased separating spring. | 31th May 1926 | Box 105 \ 4 scan0048 | |
| Recommending the use of lead bronze bushes and stainless steel to prevent parts from seizing and rusting. | 7th Jul 1926 | Box 105 \ 4 scan0049 | |
| Recommendation to use Staybright or stainless steel for the pegs on the servo for the Phantom and 20 HP models. | 16th Jul 1926 | Box 105 \ 4 scan0050 | |
| Requesting results of experiments on servo operating gear flexibility for the Phantom and 20 HP models. | 1st Aug 1926 | Box 105 \ 4 scan0051 | |
| Use of a rubber disc instead of steel-plate springs for flexibility in the servo mechanism for the 20 HP model. | 22th Nov 1926 | Box 105 \ 4 scan0052 | |
| Standardisation of a steel spring adaptation to improve flexibility in the servo device. | 25th Oct 1926 | Box 105 \ 4 scan0053 | |
| Dangerous 'jaggering' issue with the 20 HP chassis servo and a proposed solution. | 20th Dec 1926 | Box 105 \ 4 scan0054 | |
| Request to update a standardisation sheet by retaining spring G.52187 and deleting spring G.53165 for a servo device scheme. | 3rd Mar 1927 | Box 105 \ 4 scan0055 | |
| Incorrectly standardised servo spring causing poor brake operation, requesting to revert to the old standard spring. | 12th Apr 1927 | Box 105 \ 4 scan0056 | |
| Brake knock on 20 HP cars, recommending a standardised flexible servo operation be fitted to all 20 HP and Phantom models. | 25th Apr 1927 | Box 105 \ 4 scan0057 | |
| Unsatisfactory brake servo performance without a spring thrust collar and reports of rough action. | 29th Apr 1927 | Box 105 \ 4 scan0058 | |
| Suggestion to eliminate a clanking noise emanating from the servo stops. | 9th Sep 1928 | Box 105 \ 4 scan0059 | |
| Drawing of a rubber buffer applied to a servo balance lever for a 20 HP model. | 7th Sep 1928 | Box 105 \ 4 scan0060 | |
| Request for detailed drawings of a rubber buffer applied to a servo balance lever for a 20 HP model. | 8th Sep 1928 | Box 105 \ 4 scan0061 | |
| Diagram showing a rubber buffer applied to a servo balance lever for a 20 HP model. | 24th Sep 1926 | Box 105 \ 4 scan0062 | |
| Specifications and performance of servos and cams for the Phantom and 20 HP models. | 21th Dec 1928 | Box 105 \ 4 scan0063 | |
| Investigation into the cause and potential cures for a clanking noise in the brake mechanism upon pedal release. | 9th Oct 1929 | Box 105 \ 4 scan0064 | |
| Troubleshooting brake and servo noise by fitting cushioned stops to the front equaliser shaft. | 2nd Oct 1929 | Box 105 \ 4 scan0065 | |
| Test report on a buffer stop for a servo balance lever, comparing steel plates with rubber blocks to reduce noise. | 2nd Oct 1929 | Box 105 \ 4 scan0066 | |
| Description of a damper's function within the brake mechanism. | 15th Oct 1929 | Box 105 \ 4 scan0067 | |
| Attached print about a clanking brake mechanism. | 15th Oct 1929 | Box 105 \ 4 scan0068 | |
| Extract from a quarterly complaints report regarding a lack of flexibility in the 20 HP servo. | 27th Feb 1930 | Box 105 \ 4 scan0069 | |
| Internal request to order servo linings for the Phantom II and 20 HP models. | 5th Apr 1930 | Box 105 \ 4 scan0070 | |
| The incorporation of a Ferobesto 'D' bush for the 20 HP 'S' Series servo anchorage. | 17th Apr 1930 | Box 105 \ 4 scan0071 | |
| Raising questions before the finalization of a standardisation sheet for cotton duck brake lining on the 20/25 HP chassis. | 21th May 1930 | Box 105 \ 4 scan0072 | |
| The use of staples for fixing Cotton-Duck servo linings on a 20 HP chassis. | 22th May 1930 | Box 105 \ 4 scan0073 | |
| Standardisation report for a cotton duck brake lining for the servo system. | 15th Apr 1930 | Box 105 \ 4 scan0074 | |
| Brake thumping on the 25 HP car (Japan) and proposing a new paragraph for the instruction book. | 5th Sep 1930 | Box 105 \ 4 scan0075 | |
| Brake system performance, covering servo lining friction, heat dissipation, and brake drum materials. | 5th Sep 1930 | Box 105 \ 4 scan0076 | |
| Instructing that a servo wick feed modification from the Phantom model be incorporated on the 25 HP model. | 8th Sep 1930 | Box 105 \ 4 scan0077 | |
| The fitting of 35° ball bearing cams to the 25 HP servo. | 6th Oct 1931 | Box 105 \ 4 scan0078 | |
| Overoiling of the 25 HP servo fabrics and a proposed solution. | 20th Oct 1931 | Box 105 \ 4 scan0079 | |
| Standardisation of ball bearing cams for the 40/50 HP and 25 HP servo models. | 20th Oct 1931 | Box 105 \ 4 scan0080 | |
| Modifications to the servo for car 18.G.IV. | 20th Oct 1931 | Box 105 \ 4 scan0081 | |
| Requesting the production and fitting of standardised ball bearing servo cams. | 8th Nov 1931 | Box 105 \ 4 scan0082 | |
| The introduction of ball bearing Cams for the Servo, eliminating the need for an oil feed. | 15th Jan 1932 | Box 105 \ 4 scan0083 | |
| Standardisation of chassis parts, specifically ball bearing cams for the servo. | 7th Oct 1931 | Box 105 \ 4 scan0084 | |
| The introduction of a new part for the 'U' series chassis. | 2nd May 1932 | Box 105 \ 4 scan0085 | |
| Brake servo failures on the Phantom II and a proposed modification to fix the issue. | 25th May 1932 | Box 105 \ 4 scan0086 | |
| Issue of servo-brake thumps on the 20/25HP car and a proposed solution using a modified dash pot. | 26th May 1932 | Box 105 \ 4 scan0087 | |
| Typed memorandum detailing proposed modifications to a brake damper system. | 26th May 1932 | Box 105 \ 4 scan0088 | |
| Servo brake thumps in a 20/25 HP car, detailing causes and attempted remedies. | 17th Aug 1932 | Box 105 \ 4 scan0089 | |
| Use of a damper on a balance lever to eliminate brake thumps on a Peregrine chassis. | 17th Aug 1932 | Box 105 \ 4 scan0090 | |
| Blueprint of an experimental damper rig designed to cure brake thumps on a 20/25 HP model. | 23th Aug 1932 | Box 105 \ 4 scan0091 | |
| The unsatisfactory performance of cotton duck servo fabrics on the 20/25 HP model. | 23th Aug 1932 | Box 105 \ 4 scan0092 | |
| Recurring brake servo failure on a 20/25 model and a related propeller shaft query. | 5th Sep 1932 | Box 105 \ 4 scan0093 | |
| Test results for various servo linings on the 25 HP model. | 7th Sep 1932 | Box 105 \ 4 scan0094 | |
| Instruction memo regarding fitting new Ferodo R.A.D.13 material to 25 HP servo plates. | 7th Sep 1932 | Box 105 \ 4 scan0095 | |
| Testing of new moulded servo linings as a replacement for existing cotton duck linings. | 9th Sep 1932 | Box 105 \ 4 scan0096 | |
| Servo-assisted braking systems, material choices, performance consistency with temperature, and comparisons to other brake types. | 14th Sep 1932 | Box 105 \ 4 scan0097 | |
| Calculations for servo end pressure for the Peregrine and 20/25 HP models. | 15th Sep 1932 | Box 105 \ 4 scan0098 | |
| Investigation into the failures of servo fabrics identifying faulty indents and incorrect tooling. | 20th Sep 1932 | Box 105 \ 4 scan0099 | |
| Request to fit one set of servo linings Rad.13 to a test bed gearbox for a 20/25 Servo. | 24th Sep 1932 | Box 105 \ 4 scan0100 | |
| New servo lining sample, including its specifications and recommendations for use. | 10th Oct 1932 | Box 105 \ 4 scan0101 | |
| Request to the Gearbox Department for the loan of two sets of 20/25 servo cams to the Experimental Department for testing. | 10th Oct 1932 | Box 105 \ 4 scan0102 | |
| Issues affecting servo efficiency found during the dismantling of a chassis. | 13th Oct 1932 | Box 105 \ 4 scan0103 | |
| From 'R.' discussing a previously designed servo system with freewheels and its patent implications relative to existing patents. | 7th Nov 1932 | Box 105 \ 4 scan0104 | |
| Standardisation of a new type of lining for the 20/25 & 20/50 chassis models. | 10th Oct 1932 | Box 105 \ 4 scan0105 | |
| Form for standardising chassis parts, detailing the introduction of a new part for testing. | 16th Nov 1932 | Box 105 \ 4 scan0106 | |
| Outlining three suggestions for arranging a servo to only operate in a forward direction, regardless of the car's direction of travel. | 16th Nov 1932 | Box 105 \ 4 scan0107 | |
| Modifications to Ferodo Servo linings and sending drawings. | 22th Nov 1932 | Box 105 \ 4 scan0108 | |
| Confirming arrangements for inspecting a 20/25 HP chassis with a reported slipping clutch. | 25th Jan 1933 | Box 105 \ 4 scan0109 | |
| Recommendation to adopt a .010' diametral clearance on servo driving pins to prevent binding. | 25th Jan 1933 | Box 105 \ 4 scan0110 | |
| The use of an oil dashpot on the 25HP and Bensport servo brake linkage. | 25th Apr 1933 | Box 105 \ 4 scan0111 | |
| Requesting modification to the drawings for the 20/25 & Bensport Servo GL. 609. | 21th Jul 1933 | Box 105 \ 4 scan0112 | |
| Scheme showing modifications to the Servo Motor to prevent spreading of Cotton Friction Lining. | 24th Jul 1933 | Box 105 \ 4 scan0113 | |
| Requesting a modified servo and a dashpot for a new scheme. | 1st Aug 1933 | Box 105 \ 4 scan0114 | |
| Change from a press fit to a sliding fit for the outer ring on servo cams. | 1st Sep 1933 | Box 105 \ 4 scan0115 | |
| Potential deletion of the lubrication scheme for the 20/25 HP Servo. | 2nd Oct 1933 | Box 105 \ 4 scan0116 | |
| Cost-saving modification to the servo lubrication system, replacing Bijur lubrication with manual hand lubrication. | 4th Oct 1933 | Box 105 \ 4 scan0117 | |
| Removal of the Bijur lubrication system from the 20/25 HP servo due to inefficiency. | 4th Oct 1933 | Box 105 \ 4 scan0118 | |
| Quarterly complaints and a standardisation for the 20/25 servo, recommending an immediate production modification. | 27th Sep 1933 | Box 105 \ 4 scan0119 | |
| Asking for a recommendation on the 20/25 HP Servo following a conference in Derby. | 4th Oct 1933 | Box 105 \ 4 scan0120 | |
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