| Description | Date | Identifier | |
| Continued discussion on piston design, gas leakage, and the effectiveness of different types of piston rings. | 12th Apr 1920 | Box 74 \ 3 scan0081 | |
| Comparison of horsepower (HP) for an engine with cast iron vs. aluminium pistons, and a test showing HP with different numbers of piston rings. | 12th Apr 1920 | Box 74 \ 3 scan0082 | |
| Proposal to add extra rings to pistons to resolve various engine faults. | 20th Apr 1920 | Box 74 \ 3 scan0083 | |
| Engine issues including oil leaks, ignition problems, and unsatisfactory performance. | 20th Apr 1920 | Box 74 \ 3 scan0084 | |
| Complaints and potential solutions for fumes entering the interior of covered car bodies. | 24th Apr 1920 | Box 74 \ 3 scan0085 | |
| Unfavorable criticism regarding post-war car acceleration and horsepower compared to pre-war models. | 10th Sep 1920 | Box 74 \ 3 scan0086 | |
| Engine performance comparing high and low compression, discussing over-oiling issues and customer feedback. | 10th Sep 1920 | Box 74 \ 3 scan0087 | |
| Gear ratios, tyre sizes, and engine performance in pre-war and post-war cars. | 10th Sep 1920 | Box 74 \ 3 scan0088 | |
| Issues with pre-war pistons, broken induction pipes, and piston ring claps, suggesting a trial of aluminium pistons. | 22th Nov 1923 | Box 74 \ 3 scan0089 | |
| Causes of gumming pistons and the relative merits of various lubricating oils. | 1st Oct 1926 | Box 74 \ 3 scan0090 | |
| Issues caused by gas leakage past engine pistons and the development of an apparatus to test for it. | 12th Oct 1926 | Box 74 \ 3 scan0091 | |
| Test report on engine air leakage with results tabulated against engine speed. | 12th Oct 1926 | Box 74 \ 3 scan0092 | |
| Engine leakage tests, observing variations with speed and planning further tests on rings and pistons. | 10th Oct 1926 | Box 74 \ 3 scan0093 | |
| Piston leakage, suggesting testing pressure at normal speed rather than leaks at various speeds. | 10th Oct 1926 | Box 74 \ 3 scan0094 | |
| Tests on gas leakage past pistons on a Phantom engine under various pressures. | 9th Nov 1926 | Box 74 \ 3 scan0095 | |
| Piston ring leakage tests, discussing the effects of speed, pressure, and potential 'gumming' issues. | 28th Nov 1926 | Box 74 \ 3 scan0096 | |
| Graph plotting piston leakage against compression pressure for a 'New Phantom' engine at different RPMs. | 28th Nov 1926 | Box 74 \ 3 scan0097 | |
| Temperature of the air under the foot-boards where the main switch is fixed. | 14th Aug 1919 | Box 74 \ 3 scan0098 | |
| Thermometers, thermostats, and crankcase breather fumes for the 40/50 HP chassis. | 4th Feb 1920 | Box 74 \ 3 scan0099 | |
| Proposal for an experiment to vent engine breather gas directly to the open air to prevent it entering the cabin. | 5th Feb 1920 | Box 74 \ 3 scan0100 | |
| Complaints and potential causes of fumes inside covered car bodies. | 24th Feb 1920 | Box 74 \ 3 scan0101 | |
| Urgent response regarding a customer's complaint about fumes in the car body. | 25th Feb 1921 | Box 74 \ 3 scan0102 | |
| Requesting an experiment to redirect crankchamber fumes away from the vehicle body, based on a suggestion by Mr. Royce. | 26th Feb 1920 | Box 74 \ 3 scan0103 | |
| Customer complaints about engine fumes entering covered bodies and proposing a solution. | 1st Mar 1921 | Box 74 \ 3 scan0104 | |
| Potential non-standard additions and improvements for a trials car for the American Company. | 1st Mar 1920 | Box 74 \ 3 scan0105 | |
| Suggestion for the disposal of gases from the breather pipe by routing them to the carburetter. | 23th Mar 1920 | Box 74 \ 3 scan0106 | |
| Mr. Royce's suggestions for improving ventilation to resolve issues with hot footboards and engine fumes. | 23th Mar 1920 | Box 74 \ 3 scan0107 | |
| Customer complaints about fumes in the car body and a proposed solution involving the crankchamber breather. | 3rd Feb 1921 | Box 74 \ 3 scan0108 | |
| Customer complaints about fumes in car bodies and proposing a solution to modify the chassis. | 24th Mar 1921 | Box 74 \ 3 scan0109 | |
| Debiting work to a department and the process for handling disagreements. | 23th Mar 1921 | Box 74 \ 3 scan0110 | |
| Customer complaints about engine oil leaks and recommendations for improving crankchamber ventilation. | 31th Mar 1921 | Box 74 \ 3 scan0111 | |
| Temporary fitting to stop crankcase breather fumes entering the vehicle body, and the need for a permanent design. | 5th Apr 1921 | Box 74 \ 3 scan0112 | |
| Internal memorandum regarding customer complaints about fumes entering car bodies. | 6th Apr 1921 | Box 74 \ 3 scan0113 | |
| Successful fix of a fume issue in a customer's car and the proposal to standardize the solution. | 14th Apr 1921 | Box 74 \ 3 scan0114 | |
| Points of oil leakage from engines and suggesting potential improvements. | 15th Apr 1921 | Box 74 \ 3 scan0115 | |
| Proposal for connecting the breather and carburetter on the 40/50 engine to avoid fumes entering the body. | 16th Apr 1921 | Box 74 \ 3 scan0116 | |
| Proposal for a 'Goshawk' breather and oil filler to prevent engine fumes from entering closed bodies. | 19th Apr 1921 | Box 74 \ 3 scan0117 | |
| Customer's complaint about engine fumes and the urgency to install a new pipe. | 21th Apr 1921 | Box 74 \ 3 scan0118 | |
| Customer complaints regarding fumes in the car body and crankchamber breather, seeking approval for an experimental fix. | 23th Apr 1921 | Box 74 \ 3 scan0119 | |
| Temporary and a new scheme for dealing with engine fumes in car bodies. | 29th Apr 1921 | Box 74 \ 3 scan0120 | |
| Requesting clarification on the sufficient diameter for a copper pipe to ventilate an engine. | 5th May 1921 | Box 74 \ 3 scan0121 | |
| Remedying issues with fumes entering the vehicle body, suggesting modifications to the cut-out, silencer, and pedals. | 28th Jun 1921 | Box 74 \ 3 scan0122 | |
| Extract from a letter discussing solutions for fumes entering the car body, particularly for American models. | 6th Jul 1921 | Box 74 \ 3 scan0123 | |
| Standardising a breather from Springfield to solve fume issues in car bodies for the American market. | 1st Jul 1921 | Box 74 \ 3 scan0124 | |
| Memo discussing the design and testing of a cast aluminum breather for covered bodies. | 21th Jun 1921 | Box 74 \ 3 scan0125 | |
| Letter with a technical drawing proposing a modification to a breather. | 21th Jun 1921 | Box 74 \ 3 scan0126 | |
| Producing the present type of crankcase breathers while awaiting standardization of a new design. | 11th Jul 1921 | Box 74 \ 3 scan0127 | |
| Test results and recommendations for preventing crankcase fumes in the 40/50 chassis. | 19th Jul 1921 | Box 74 \ 3 scan0128 | |
| Crankcase pressure, vent pipes, and the effects of lubricating oil dilution. | 19th Jul 1921 | Box 74 \ 3 scan0129 | |
| Internal memorandum from Sft. to Hs. regarding the production status of parts for crankcase breathers. | 15th Jul 1921 | Box 74 \ 3 scan0130 | |
| Standardization of a proposed inexpensive vent for the 40/50 chassis crankcase. | 8th Aug 1921 | Box 74 \ 3 scan0131 | |
| Persistent oil leaks from bottom half crankchamber joints and proposing the addition of lugs and bolts as a solution. | 9th Sep 1921 | Box 74 \ 3 scan0132 | |
| Car overheating issues in Switzerland and various tests and modifications to address them. | 1st Oct 1921 | Box 74 \ 3 scan0133 | |
| Investigation into the cause of 'sea-sickness' in covered cars, identifying exhaust fumes as the culprit. | 15th Nov 1921 | Box 74 \ 3 scan0134 | |
| Solutions for crankchamber fumes and ride comfort issues causing 'sea-sickness'. | 20th Dec 1921 | Box 74 \ 3 scan0135 | |
| The escalation process for obtaining a satisfactory explanation. | 20th Dec 1921 | Box 74 \ 3 scan0136 | |
| Solution for engine fumes on the 40/50 chassis by using a carburetter air inlet connection. | 30th Dec 1921 | Box 74 \ 3 scan0137 | |
| Standardisation of chassis parts relating to the crankcase vent. | 4th Sep 1922 | Box 74 \ 3 scan0138 | |
| Urgent internal memo regarding a customer complaint about a missing crankchamber fume device on Chassis 43-RG for Lord Rocksavage. | 14th Nov 1922 | Box 74 \ 3 scan0139 | |
| Standardization of a device for crankchamber fume extraction and its supply for Lord Rocksavage's car, chassis 43-RG. | 14th Nov 1922 | Box 74 \ 3 scan0140 | |
| Solution for excessive engine fumes by fitting a breather pipe from the crankcase to the hot air pipe. | 26th Jan 1923 | Box 74 \ 3 scan0141 | |
| Requesting a blueprint regarding the breather pipe from the crankcase to the hot air pipe for a 40/50 chassis. | 27th Feb 1923 | Box 74 \ 3 scan0142 | |
| Arrangement of a breather pipe from the crankcase to the hot air pipe for the 40/50 model. | 1st Mar 1923 | Box 74 \ 3 scan0143 | |
| Complaints about excessive heat in the vehicle's cowl and driver's footwell. | 30th Jul 1925 | Box 74 \ 3 scan0144 | |
| Complaints of excessive heat in the vehicle's cowl and footwell, with proposed solutions. | 30th Jul 1925 | Box 74 \ 3 scan0145 | |
| Modifications to reduce heat and noise, such as a double dashboard, rubber floor mats, and a shorter gearbox undersheet. | 30th Jul 1925 | Box 74 \ 3 scan0146 | |
| Suggestion for routing an exhaust pipe and arranging a vaporizer, requesting comments from Mr. Royce. | 1st Jul 1928 | Box 74 \ 3 scan0147 | |
| Drawing of a corrugated rubber mat for the front floorboard. | 1st Jul 1928 | Box 74 \ 3 scan0148 | |
| Hand-drawn diagram showing a double dash arrangement for Mr Thorsen's car. | 28th Jul 1923 | Box 74 \ 3 scan0149 | |
| Hand-drawn scheme for splash guards to replace ventilated under-sheets. | 1st Jul 1928 | Box 74 \ 3 scan0150 | |
| Proposed aluminum guard to prevent hot drafts through the pedal slots, replacing the flywheel guard. | 28th Jul 1928 | Box 74 \ 3 scan0151 | |
| Causes and potential solutions for fumes entering the car's interior. | 29th Mar 1924 | Box 74 \ 3 scan0152 | |
| Confirming the chassis number for a car fitted with the Argen Heating Scheme and arranging a road test. | 29th Apr 1924 | Box 74 \ 3 scan0153 | |
| Issue of fumes in car bodies and arranging for a trial on experimental cars. | 1st Jun 1924 | Box 74 \ 3 scan0154 | |
| Investigation into the cause and solution for exhaust fumes entering closed car bodies, identifying air suction as the root problem. | 3rd Jun 1924 | Box 74 \ 3 scan0155 | |
| Solutions to prevent exhaust fumes from entering the car body through window 'falls'. | 3rd Jun 1924 | Box 74 \ 3 scan0156 | |
| Methods to eliminate fumes and smell from oil dripping on the 40/50 HP model. | 25th Jun 1924 | Box 74 \ 3 scan0157 | |
| Issue of engine exhaust fumes entering the car body and proposing a swan neck exhaust as a solution. | 1st Jun 1925 | Box 74 \ 3 scan0158 | |
| Fumes entering the car bodies on the Phantom and 20 HP models. | 14th Oct 1925 | Box 74 \ 3 scan0159 | |
| Fumes in car bodies and the plan to supply a drawing for a casing around the gear change system. | 24th Oct 1925 | Box 74 \ 3 scan0160 | |
| Proposed modification to prevent hot air leaks into the coachwork via the gearbox gate mechanism. | 24th Mar 1926 | Box 74 \ 3 scan0161 | |
| Revised scheme to prevent gas leaks through India floorboards, which improves gearbox maintenance. | 25th Mar 1926 | Box 74 \ 3 scan0162 | |
| Causes and potential solutions for overheating in the rear compartment of Phantom cars. | 14th Jul 1926 | Box 74 \ 3 scan0163 | |
| Request for an experiment to measure the floor temperature of a closed car and identify heat sources. | 9th Aug 1926 | Box 74 \ 3 scan0164 | |
| Test report on interior overheating in Phantom cars caused by heat radiation from the silencer. | 9th Aug 1926 | Box 74 \ 3 scan0165 | |
| Recommendations for heat insulation of floorboards using asbestos lagging to shield from silencer heat. | 9th Aug 1926 | Box 74 \ 3 scan0166 | |
| Customer complaints about overheating in the interior of Phantom cars and a proposed solution. | 25th Aug 1926 | Box 74 \ 3 scan0167 | |
| Temporary and permanent solutions for heating issues in the back of closed 'New Phantom' cars. | 25th Aug 1926 | Box 74 \ 3 scan0168 | |
| Methods to insulate the coachwork from exhaust pipe heat. | 23th Aug 1926 | Box 74 \ 3 scan0169 | |
| Issue of overheating in New Phantom Cars due to heat from the floor-boards. | 4th Aug 1926 | Box 74 \ 3 scan0170 | |
| Overheating in the interior of Phantom cars and the challenges of fitting exhaust lagging. | 30th Aug 1926 | Box 74 \ 3 scan0171 | |
| Investigating heat in the rear compartments of 40/50 HP cars and a coachbuilder's proposed solutions. | 31th Aug 1926 | Box 74 \ 3 scan0172 | |
| Letter suggesting the chassis builder is responsible for the heat in the car's interior. | 1st Sep 1926 | Box 74 \ 3 scan0173 | |
| Resolving issues with unbearable heat from the footboards of closed bodies on Phantom chassis. | 1st Sep 1926 | Box 74 \ 3 scan0174 | |
| Overheating in the interior of Phantom Cars. | 1st Sep 1926 | Box 74 \ 3 scan0175 | |
| Solutions for overheating interiors in Phantom cars, focusing on insulation and collaboration with coachbuilders. | 7th Sep 1926 | Box 74 \ 3 scan0176 | |
| The unusual experience of both rear tyres being punctured simultaneously. | 9th Sep 1926 | Box 74 \ 3 scan0177 | |
| Private memo regarding complaints and the overheating of inside bodies. | 9th Sep 1926 | Box 74 \ 3 scan0178 | |
| Reduction of interior heat in Phantom cars. | 16th Sep 1926 | Box 74 \ 3 scan0179 | |
| Cost and liability for fitting asbestos sheeting to address interior heat in 'Phantom' cars. | 14th Sep 1926 | Box 74 \ 3 scan0180 | |
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