| Description | Date | Identifier | |
| The material ordering deadline for an F-2 Series Phantom Sports Chassis radiator. | 3rd Jan 1928 | Box 66a \ 4 scan0263 | |
| Water flow, overheating issues, and capacities of different radiator types. | 17th Jan 1928 | Box 66a \ 4 scan0264 | |
| On radiator flow impairment due to slime buildup from hard water, proposing a chemical cleaning solution and design changes. | 19th Jan 1928 | Box 66a \ 4 scan0265 | |
| Query regarding the status of a proposal to alter the radiator design by raising its shoulders to improve car body lines. | 23th Jan 1928 | Box 66a \ 4 scan0266 | |
| Engine overheating caused by slimy deposits from hard water choking the radiator core. | 24th Jan 1928 | Box 66a \ 4 scan0267 | |
| Methods for testing for radiator obstruction and for cleaning the radiator core using a chemical mixture. | 24th Jan 1928 | Box 66a \ 4 scan0268 | |
| Instructions for radiator cleaning, discussing treatment procedures and the importance of using soft water. | 24th Jan 1928 | Box 66a \ 4 scan0269 | |
| Graph of water flow in gallons per minute versus engine RPM for a complete water system. | 24th Jan 1928 | Box 66a \ 4 scan0270 | |
| Diagrams illustrating accurate and rough tests for radiator efficiency and system restriction. | 22th Jan 1923 | Box 66a \ 4 scan0271 | |
| Blueprint drawing for a water venturimeter with dimensions, formulas, and construction notes. | 22th Jan 1923 | Box 66a \ 4 scan0272 | |
| Halted work on altering the radiator's appearance and suggesting a new approach. | 25th Jan 1928 | Box 66a \ 4 scan0273 | |
| Confirming the adoption of a suggestion regarding the radiator. | 26th Jan 1928 | Box 66a \ 4 scan0274 | |
| Standardisation of a radiator with integral shutters to improve appearance and reduce weight. | 7th Nov 1927 | Box 66a \ 4 scan0275 | |
| Schedule and costs for fitting a new part to a chassis series. | 9th Apr 1928 | Box 66a \ 4 scan0276 | |
| Procedure and materials for cleaning radiators. | 2nd Apr 1928 | Box 66a \ 4 scan0277 | |
| Warning notice regarding the use of 'Kleanwell' radiator cleaning solution on vehicles with aluminium cylinder heads. | 1st Jun 1928 | Box 66a \ 4 scan0278 | |
| The 'KLEENWELL' radiator product and previous communications on the matter. | 6th Jul 1928 | Box 66a \ 4 scan0279 | |
| Investigating a new self-lubricating bearing material for radiator supports. | 25th Aug 1928 | Box 66a \ 4 scan0280 | |
| Report concerning a choked radiator on car 29-CL caused by grease from the water pump. | 11th Feb 1929 | Box 66a \ 4 scan0281 | |
| Reduction of radiator tube diameters and cleaning procedures. | 2nd Feb 1929 | Box 66a \ 4 scan0282 | |
| Radiator core choking due to high viscosity anti-freeze solutions and water pump gland lubrication. | 30th Apr 1929 | Box 66a \ 4 scan0283 | |
| Engine cooling and water circulation issues, highlighting radiator blockages from water quality and a specific chassis case. | 10th May 1929 | Box 66a \ 4 scan0284 | |
| Radiator performance, potential failures, and the effects of anti-freeze. | 9th Sep 1929 | Box 66a \ 4 scan0285 | |
| Design of engine radiator tubes and water circulation. | 9th Sep 1929 | Box 66a \ 4 scan0286 | |
| Radiator tube corrosion issues in Springfield, USA, due to variations in water quality. | 13th May 1929 | Box 66a \ 4 scan0287 | |
| Effect of an anti-freezing mixture on radiator tubes. | 13th May 1929 | Box 66a \ 4 scan0288 | |
| Responding to a radiator difficulty, discussing tube materials, corrosion causes, and water quality. | 13th May 1929 | Box 66a \ 4 scan0289 | |
| Radiator corrosion, comparing the effectiveness of tinned tubes versus using rainwater to prevent damage. | 13th May 1929 | Box 66a \ 4 scan0290 | |
| Request to borrow a standard Phantom radiator for comparative tests on water flows. | 27th May 1929 | Box 66a \ 4 scan0291 | |
| Comparing the cooling performance of the 'SS' car against previous Phantom models. | 27th May 1929 | Box 66a \ 4 scan0292 | |
| High-speed cooling tests, comparing car overheating with louvred versus plain bonnets. | 12th Jun 1927 | Box 66a \ 4 scan0293 | |
| Continued report on bonnet ventilation and overheating issues in hot weather conditions. | 27th May 1929 | Box 66a \ 4 scan0294 | |
| Performance comparison chart of top water temperature during a hill climb for three car models with different radiator configurations. | 27th May 1929 | Box 66a \ 4 scan0295 | |
| Phantom radiator from the Stores for experimental examination purposes. | 3rd Jun 1929 | Box 66a \ 4 scan0296 | |
| Results and recommendations from radiator flow rate tests. | 27th Jul 1929 | Box 66a \ 4 scan0297 | |
| Recommendation to circulate a depot sheet regarding the cleaning of Phantom radiators to prevent clogging by aluminium hydroxide. | 7th Aug 1929 | Box 66a \ 4 scan0298 | |
| New, cleanable radiator design and the testing of a self-cleaning filter. | 25th Nov 1929 | Box 66a \ 4 scan0299 | |
| Ongoing difficulties and repairs for noise originating from the servo gears. | 19th Jun 1924 | Box 67 \ 1 scan0001 | |
| Directive to stop producing existing servo gear parts for the E.A.C.II model and replace them with a new experimental design. | 13th Oct 1924 | Box 67 \ 1 scan0002 | |
| Instructions for a strengthened E.A.C.II servo drive to overcome rattling and noise issues. | 12th Nov 1924 | Box 67 \ 1 scan0003 | |
| Modifications and urgent requirements for front brake adjustment and the servo system. | 10th Jun 1925 | Box 67 \ 1 scan0004 | |
| Page 2 of a typed letter or memo regarding the urgency of making a rapid move. | 1st Jun 1925 | Box 67 \ 1 scan0005 | |
| Ignition and brake issues for the New Phantom car, focusing on servo vibration and brake friction materials. | 1st Jun 1925 | Box 67 \ 1 scan0006 | |
| Potential modifications to address 'servo jaggers' on 20 HP and 40/50 models. | 25th Aug 1925 | Box 67 \ 1 scan0007 | |
| Proposal to use Duralumin instead of porous phosphor bronze for servo gear worm wheels in 40/50 & 20 HP models. | 1st Oct 1925 | Box 67 \ 1 scan0008 | |
| Introducing flexibility to servo operating cams to overcome 'jaggers' and brake snatching. | 1st Oct 1925 | Box 67 \ 1 scan0009 | |
| Servo effectiveness issues on the 'New Phantom' chassis, related to incorrect pin fitting and oil contamination. | 13th Nov 1925 | Box 67 \ 1 scan0010 | |
| Testing of Servo Friction Halos for brakes after they were deemed ineffective on a trials car. | 13th Nov 1925 | Box 67 \ 1 scan0011 | |
| Efficiency of servos on a 103-MC, and recommending direct measurement when in doubt. | 16th Nov 1925 | Box 67 \ 1 scan0012 | |
| Potential modification to the New Phantom chassis servo to prevent mis-assembly. | 17th Nov 1925 | Box 67 \ 1 scan0013 | |
| Investigating complaints of varying brake efficiency due to oil on the brake servo motors. | 12th Jun 1925 | Box 67 \ 1 scan0014 | |
| Oil creepage from a servo plate onto friction plates and suggestions for remediation. | 12th Jun 1925 | Box 67 \ 1 scan0015 | |
| Diagram illustrating the distribution of oil resulting from excessive lubrication at a specific point in an assembly. | 1st Dec 1936 | Box 67 \ 1 scan0016 | |
| The cause and cure for 'servo jaggers' in braking systems. | 12th Jun 1925 | Box 67 \ 1 scan0017 | |
| Unsuccessful test to overcome 'servo jaggers' and recommending a new solution. | 16th Dec 1925 | Box 67 \ 1 scan0018 | |
| Requesting a design scheme to introduce flexibility in the servo engagement to prevent 'servo jaggers'. | 1st Jan 1926 | Box 67 \ 1 scan0019 | |
| Experiments to eliminate 'servo jaggers' and 'thumping' in the braking system. | 5th Jan 1926 | Box 67 \ 1 scan0020 | |
| Experiments to cure 'servo jaggers' and thumping issues by modifying springs and camshaft flexibility. | 28th Jan 1926 | Box 67 \ 1 scan0021 | |
| 'Servo Jaggers' and the use of a rubber washer on the Phantom model. | 22th Apr 1926 | Box 67 \ 1 scan0022 | |
| Telegram regarding the reduction of a countershaft diameter for a Twenty horsepower model. | 29th Apr 1926 | Box 67 \ 1 scan0023 | |
| New Phantom servo operation, proposing a flexible washer to cure servo jaggers. | 30th Apr 1926 | Box 67 \ 1 scan0024 | |
| Introduction of a rubber ring to add flexibility to the servo operation. | 3rd May 1926 | Box 67 \ 1 scan0025 | |
| Requesting a drawing for a particular rubber ring for a standardisation proposal on servo operation. | 5th May 1926 | Box 67 \ 1 scan0026 | |
| Issue with 'servo jaggers' and the use of a rubber washer as a temporary solution. | 5th May 1926 | Box 67 \ 1 scan0027 | |
| Brief internal memo from BJ to Hs regarding Servo Jaggers. | 11th May 1926 | Box 67 \ 1 scan0028 | |
| The distribution of a standardisation sheet for 'Servo Jaggers'. | 14th May 1926 | Box 67 \ 1 scan0029 | |
| Suggesting modifications to the Phantom servo operation for increased flexibility. | 19th May 1926 | Box 67 \ 1 scan0030 | |
| Improved friction head for the Phantom servo gear balancer links. | 20th May 1926 | Box 67 \ 1 scan0031 | |
| Scheme N.2196 for the 20HP servo gear, detailing its flexibility and an increased separating spring. | 31th May 1926 | Box 67 \ 1 scan0032 | |
| Standardisation of chassis parts to introduce flexibility in servo operation to overcome servo jaggers. | 30th Apr 1926 | Box 67 \ 1 scan0033 | |
| Introduction of flexibility in servo-operation to overcome 'servo jaggers'. | 11th Jun 1926 | Box 67 \ 1 scan0034 | |
| Modification to overcome 'Servo Jagger' on specific trial cars. | 17th Jun 1926 | Box 67 \ 1 scan0035 | |
| Modification to the 40/50 HP chassis to overcome servo jaggers. | 19th Jun 1926 | Box 67 \ 1 scan0036 | |
| Dangerous 'servo jagger and grab' braking issue on chassis 21-TC and the need for further investigation. | 23th Jun 1926 | Box 67 \ 1 scan0037 | |
| Recommendation to use lead bronze ('Kelmit') and stainless steel ('Staybrite') to prevent parts from seizing and rusting. | 7th Jul 1926 | Box 67 \ 1 scan0038 | |
| Lubrication issue with the New Phantom Servo, proposing the use of stainless steel pegs and self-lubricating bushes. | 15th Jul 1926 | Box 67 \ 1 scan0039 | |
| Grabbing servo issue on chassis 21-DC, caused by rusty pegs. | 14th Jul 1926 | Box 67 \ 1 scan0040 | |
| Recommendation to use Staybright or Stainless steel for the pegs on the servos for the Phantom and 20 HP models. | 16th Jul 1926 | Box 67 \ 1 scan0041 | |
| Instruction to the Experimental Department to produce nine stainless steel dowel pins. | 16th Jul 1926 | Box 67 \ 1 scan0042 | |
| Material selection and finishing processes for alignment dowels. | 16th Jul 1926 | Box 67 \ 1 scan0043 | |
| Proposal to experimentally use ground and polished stainless steel dowels. | 16th Jul 1926 | Box 67 \ 1 scan0044 | |
| Flexibility in servo operation to overcome 'Servo Jaggers' on 40/50 HP cars. | 7th Aug 1926 | Box 67 \ 1 scan0045 | |
| Modifications to the Phantom servo brake gear to prevent a pin fouling a suspension link. | 27th Aug 1926 | Box 67 \ 1 scan0046 | |
| Modifications to the servo brake mechanism to improve front braking. | 1st Dec 1926 | Box 67 \ 1 scan0047 | |
| Proposed alterations to the 40/50 braking system to reduce front braking. | 19th Dec 1926 | Box 67 \ 1 scan0048 | |
| Blueprint graph and calculations concerning 40/50 model brake distribution. | 13th Dec 1926 | Box 67 \ 1 scan0049 | |
| Adjustments to the brake distribution for the 40/50 & 20 HP models. | 13th Dec 1926 | Box 67 \ 1 scan0050 | |
| Test report on using spring dampers to overcome servo jaggers, including results from a 10,000-mile test on a 12-EX model. | 22th Dec 1926 | Box 67 \ 1 scan0051 | |
| Modifying the Phantom chassis servo reduction gear to reduce noise and improve performance. | 14th Jan 1927 | Box 67 \ 1 scan0052 | |
| Standardisation document regarding flexibility in the servo shaft by replacing a rubber ring with a plate spring. | 24th Dec 1926 | Box 67 \ 1 scan0053 | |
| Querying the testing and application details for a standardisation sheet regarding flexibility in the servo shaft. | 17th Jan 1927 | Box 67 \ 1 scan0054 | |
| Standardisation sheet discussing the alteration from rubber to flat steel springs for flexibility in the servo shaft. | 1st Jan 1927 | Box 67 \ 1 scan0055 | |
| Complaints regarding servo jaggers on the New Phantom and 20 HP chassis. | 27th Jan 1927 | Box 67 \ 1 scan0056 | |
| Proposal to delay using a modified servo reduction gear until it has completed 10,000 miles. | 3rd Feb 1927 | Box 67 \ 1 scan0057 | |
| Difficulty with the 40/50 HP servo and front brake equaliser shaft, leading to brake snatching and thumps. | 11th Feb 1927 | Box 67 \ 1 scan0058 | |
| Continued analysis of a brake mechanism, proposing a mechanical stop to prevent excessive movement and slackening of the front brake ropes. | 19th Feb 1927 | Box 67 \ 1 scan0059 | |
| Standardised flexibility for the servo shaft and a proposed 2-plate spider solution for the 20 HP model. | 19th Feb 1927 | Box 67 \ 1 scan0060 | |
| Suggesting the use of a rubber scheme for servo shaft flexibility as the steel plate scheme is unfeasible without new shafts. | 24th Mar 1927 | Box 67 \ 1 scan0061 | |
| Error with a new stronger servo spring (G.74778) and requesting a return to the old standard spring (G.72484). | 12th Apr 1927 | Box 67 \ 1 scan0062 | |
| Service flexibility and the provision of free parts for complaints on 40/50 HP and 20 HP models. | 28th Apr 1927 | Box 67 \ 1 scan0063 | |
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