| Description | Date | Identifier | |
| Alterations and experimental work for the 40-50 HP present type chassis. | 18th Dec 1918 | Morton \ M11 img122 | |
| Piston policy, detailing the advantages of aluminium pistons and outlining four different designs for testing. | 18th Dec 1918 | Morton \ M11 img123 | |
| State of Dunlop detachable wheels on car 7 CA and proposing standardization on Michelin wheels. | 9th Jan 1919 | Morton \ M11 img124 | |
| Difficulty jacking up the front wheels on chassis 49 GB and the approved alteration. | 9th Jan 1919 | Morton \ M11 img125 | |
| Visit to discuss pistons, axles, and gear manufacturing for the 40/50 HP chassis. | 8th Jan 1919 | Morton \ M11 img126 | |
| Panel milling machines and proposed alterations to the Condor aero engine's induction system, cylinder head, and carburettor. | 9th Jan 1919 | Morton \ M11 img127 | |
| The design and supply of a speedometer drive for the 500 'After the War' 40/50 HP chassis. | 11th Jan 1919 | Morton \ M11 img128 | |
| Comparing the weight and strength of square tube bonded radiators versus round tube radiators. | 17th Jan 1919 | Morton \ M11 img129 | |
| Expecting to receive a model connecting rod for a car engine. | 17th Jan 1919 | Morton \ M11 img130 | |
| Clutch experiments and a proposal for a progressive clutch design using multiple springs. | 23th Jan 1919 | Morton \ M11 img131 | |
| From 'E' to 'EH' detailing Mr. Royce's suggestion to improve clutch take-up by introducing flexibility into the anchorage. | 1st Feb 1919 | Morton \ M11 img132 | |
| Positioning and specifications for starter batteries, including a critique of an existing design. | 1st Feb 1919 | Morton \ M11 img133 | |
| Specifications required for the production of trial batteries. | 1st Feb 1919 | Morton \ M11 img134 | |
| Ignition system for a new experimental production car chassis. | 1st Feb 1919 | Morton \ M11 img135 | |
| Carburettor and ignition system adjustments for improved slow running and preventing engine backfiring. | 30th Apr 1921 | Morton \ M11 img136 | |
| Distributor make ratio and ignition timing, with a supporting diagram. | 30th Apr 1921 | Morton \ M11 img137 | |
| Telegram specifying that new short connecting rods should be white-metalled directly onto steel without a bronze shell. | 6th Feb 1919 | Morton \ M11 img138 | |
| Past trials and future tests for a vacuum feed gasoline system. | 4th Feb 1919 | Morton \ M11 img139 | |
| Agreeing to continue using whitemetalled bronze bushes for connecting rods on the 40/50 HP chassis. | 11th Feb 1919 | Morton \ M11 img140 | |
| Likely cause of a collapsing radiator and comparing the performance of round brass tubes versus square or hexagon copper tubes. | 12th Feb 1919 | Morton \ M11 img141 | |
| The reproduction of the 40/50 HP car ignition system. | 12th Feb 1919 | Morton \ M11 img142 | |
| Continued memo from 'R.' to 'EFC' regarding timer gaps, manufacturing sets, and new ignition for the 20 HP model. | 25th Feb 1919 | Morton \ M11 img143 | |
| Mr. Royce's remarks and required modifications for several 40/50 HP chassis piston designs. | 25th Feb 1919 | Morton \ M11 img144 | |
| Compression ratios and carburettor settings for post-war 40/50 HP chassis. | 25th Feb 1919 | Morton \ M11 img145 | |
| Design points for a die-cast type piston with high and low piston pins for a 40/50 HP chassis. | 6th Mar 1919 | Morton \ M11 img146 | |
| Design points for pistons and requesting a revised blueprint. | 11th Mar 1919 | Morton \ M11 img147 | |
| Ideas for improving gear changing, including synchronisation and free-wheel arrangements. | 11th Mar 1919 | Morton \ M11 img148 | |
| Modifications to a gear changing mechanism, including a free wheel ratchet and a positive jaw clutch. | 11th Mar 1919 | Morton \ M11 img149 | |
| Operation of an electrically assisted clutch and gear changing mechanism. | 11th Mar 1919 | Morton \ M11 img150 | |
| Proposed carburettor design, potential patent issues, and comparison with the current model. | 11th Mar 1919 | Morton \ M11 img151 | |
| Letter providing feedback on a carburettor sketch, discussing its novelty, patent potential, and suitability for car versus aircraft engines. | 11th Mar 1919 | Morton \ M11 img152 | |
| Carburettor design, proposing a new system with a diffuser jet to improve performance over existing models. | 11th Mar 1919 | Morton \ M11 img153 | |
| From R. to E.H. continuing a discussion on carburettor design and performance. | 17th Mar 1919 | Morton \ M11 img154 | |
| Design of a proposed carburettor for a chassis. | 17th Mar 1919 | Morton \ M11 img155 | |
| Hand-drawn schematic of a carburettor or similar fuel-air mixing device with labelled components. | 13th Mar 1919 | Morton \ M11 img156 | |
| Test report on Car 7-CA discussing engine performance with a partially blocked radiator in cold weather. | 13th Mar 1919 | Morton \ M11 img157 | |
| Radiator modifications and the performance of car 7-CA, specifically regarding an extra water jacket on the induction pipe. | 13th Mar 1919 | Morton \ M11 img158 | |
| Testing Michelin wheel studs, including thread direction and preventing wheel creep. | 17th Mar 1919 | Morton \ M11 img159 | |
| Requesting tests to determine the necessity and type (right or left hand) of threads for back nuts on studs. | 1st Mar 1919 | Morton \ M11 img160 | |
| Requesting an experiment to test the 40/50 HP clutch with different driven members. | 1st Mar 1919 | Morton \ M11 img161 | |
| Suitability of a Weston instrument for a chassis, comparing it to other models. | 1st Mar 1919 | Morton \ M11 img162 | |
| Modifications and repairs for Mr. Claremont's cars. | 1st Mar 1919 | Morton \ M11 img163 | |
| Thermometer to test a 40/50 HP car and to source temperature measuring devices. | 31th Mar 1919 | Morton \ M11 img164 | |
| Solutions for monitoring and controlling engine water temperature, including thermometers and radiator louvres, and the impact of low-grade petrol. | 3rd Apr 1919 | Morton \ M11 img165 | |
| Piston design, specifically the location of the piston pin and the use of shorter connecting rods to reduce piston knock. | 1st Apr 1919 | Morton \ M11 img166 | |
| Feedback on a car's clutch, brake, and ignition performance after a test run. | 3rd Apr 1919 | Morton \ M11 img167 | |
| Manufacturing of pistons using two scraper rings and die castings in Mr. Hall's alloy. | 3rd Apr 1919 | Morton \ M11 img168 | |
| Approval to use a wiring tube on the 40/50 HP chassis, similar to one made for aero engines. | 8th Apr 1919 | Morton \ M11 img169 | |
| Mr. Royce's criticisms of scheme No.365 for a 40/50 HP floatchamber, requesting a new design. | 14th Apr 1919 | Morton \ M11 img170 | |
| Fuel consumption tests on model 49GB and methods for heating the air entering the carburetter. | 14th Apr 1919 | Morton \ M11 img171 | |
| Modifications to the 40/50 HP chassis clutch brake. | 2nd May 1919 | Morton \ M11 img172 | |
| Minutes from a conference regarding the 40/50 HP chassis, detailing instructions for various departments. | 7th May 1919 | Morton \ M11 img173 | |
| Design specifications for a new hand-controlled louvre frame for the radiator of a 40/50 HP chassis. | 1st May 1919 | Morton \ M11 img174 | |
| Specifications for radiators, thermostats, thermometers, pumps, and speedometers. | 1st May 1919 | Morton \ M11 img175 | |
| Hand-drawn schematic of a speedometer drive assembly. | 25th Oct 1918 | Morton \ M11 img176 | |
| Design of the speedometer drive and the preferred finish for instrument dials. | 1st May 1919 | Morton \ M11 img177 | |
| Specifications for the finish of instruments and controls, and the layout of the instrument board. | 1st May 1919 | Morton \ M11 img178 | |
| Notes on the design of the instrument board, bonnet clips, and carburettor float feed. | 1st May 1919 | Morton \ M11 img179 | |
| Technical notes on carburettor, shock dampers, back axle, brakes, and ignition systems. | 1st May 1919 | Morton \ M11 img180 | |
| The ignition ballast resistance coil design and the replacement of the C.A.V. lighting set with a Lucas system. | 1st May 1919 | Morton \ M11 img181 | |
| Hand-drawn schematic of a battery-powered ignition system, showing the placement of the ballast resistance. | 1st May 1919 | Morton \ M11 img182 | |
| Order for Lucas ignition sets and the specifications for a portable lamp. | 1st May 1919 | Morton \ M11 img183 | |
| Portable lamps and piston design, including a defective sample, over-oiling, and piston ring pin length. | 1st May 1919 | Morton \ M11 img184 | |
| Fault with steel stiffening plates on cast-iron pistons and recommending their removal. | 31th May 1919 | Morton \ M11 img185 | |
| Adoption of Michelin disc wheels over Dunlop wire wheels and wooden wheels. | 1st Jun 1919 | Morton \ M11 img186 | |
| Tyre and rim standards, including the difficulty of fitting them. | 1st Jun 1919 | Morton \ M11 img187 | |
| The possible use of a jelly mixture with benzol, detailing experiences with different brands. | 3rd Jul 1919 | Morton \ M11 img188 | |
| Proposal and specifications for illuminating the instrument board on the 40/50 HP chassis. | 19th Aug 1919 | Morton \ M11 img189 | |
| Query regarding an oil leak observed at the torque tube joints on the back axle of chassis 7 CA. | 19th Aug 1919 | Morton \ M11 img190 | |
| Design of rear spring pivots for the 40/50 HP and 20 HP chassis, focusing on retaining the 'U' bolts. | 8th Aug 1919 | Morton \ M11 img191 | |
| Typed letter discussing poor running, pre-ignitions, and a knock in car 7 CA. | 19th Aug 1919 | Morton \ M11 img192 | |
| Mr. Royce's findings and proposed modifications for the priming device on the 40/50 HP chassis. | 1st Aug 1919 | Morton \ M11 img193 | |
| Ignition system improvements, including material choices for springs and magneto accessibility. | 1st Aug 1919 | Morton \ M11 img194 | |
| Preliminary report on car 1 EX, detailing observations on piston knocking, design, and lubricating oil performance. | 21th Aug 1919 | Morton \ M11 img195 | |
| Solutions for piston knock through improved engine lubrication methods and oil distribution systems. | 21th Aug 1919 | Morton \ M11 img196 | |
| Engine performance for Car 1 EX, detailing piston compression, slow running characteristics, and lubrication observations. | 1st Aug 1919 | Morton \ M11 img197 | |
| Instruction from Mr. Royce to use a semi-flexible scuttle-to-dashboard attachment on all R.R. chassis. | 1st Aug 1919 | Morton \ M11 img198 | |
| Potential causes and solutions for engine piston knocks. | 26th Aug 1919 | Morton \ M11 img199 | |
| Capacity of the petrol tank for the 40/50 HP car, its stated vs actual volume, and potential future designs. | 27th Aug 1919 | Morton \ M11 img200 | |
| The design of 40/50 HP pistons to reduce knocking and improve oil scraping. | 27th Aug 1919 | Morton \ M11 img201 | |
| Advantages of pistons with low-set rings. | 11th Sep 1919 | Morton \ M11 img202 | |
| Clarifying the standard allowances for fitting pistons to prevent knocks, with different specifications for various materials. | 1st Aug 1919 | Morton \ M11 img203 | |
| Failure of a pendulum steering lever, debating material choice, and outlining questions for investigation. | 27th Aug 1919 | Morton \ M11 img204 | |
| Re-arrangement and modifications for an improved clutch brake on the 40/50 HP chassis. | 1st Sep 1919 | Morton \ M11 img205 | |
| Proposal to test extra cylinder lubrication to address piston knock under light load. | 1st Sep 1919 | Morton \ M11 img206 | |
| Use of odd tyre sizes on the 40/50 HP chassis and testing the differential. | 1st Sep 1919 | Morton \ M11 img207 | |
| Proposing a two-fold satchel with handles as an alternative design for the car's tool kit. | 1st Sep 1919 | Morton \ M11 img208 | |
| Progress on the issue of piston knocks, focusing on piston design and lubrication improvements with castor oil. | 5th Sep 1919 | Morton \ M11 img209 | |
| From Mr. Royce regarding proposed improvements to the design of standard bolt heads. | 12th Sep 1919 | Morton \ M11 img210 | |
| Simplification of bolt production and a request to produce test bolts for standardisation. | 1st Sep 1919 | Morton \ M11 img211 | |
| Telegram from Royce regarding unsatisfactory engine performance on car 49GB and suggested remedies before a 10,000-mile test. | 17th Sep 1919 | Morton \ M11 img212 | |
| Diagnosis of a harsh engine feeling in car 49-GB and experiments to fix it. | 17th Sep 1919 | Morton \ M11 img213 | |
| Engine harshness from slipper wheels, compression ratios, and the work status of experimental cars 1.EX and 49-GB. | 17th Sep 1919 | Morton \ M11 img214 | |
| Issues and suggested remedies for chassis 49 GB. | 1st Sep 1919 | Morton \ M11 img215 | |
| Fitting of rear shock absorbers and recommendations for cylinder lubrication. | 1st Sep 1919 | Morton \ M11 img216 | |
| Issues with the air pump, air pressure system, vibration, and battery leakage on chassis 49 GB. | 1st Sep 1919 | Morton \ M11 img217 | |
| Continued memo from R. to E.H. detailing issues and suggestions for wire insulation, piston leakage, and clutch lubrication. | 1st Sep 1919 | Morton \ M11 img218 | |
| Engine harshness, gas leaks, and vibration issues for chassis 49 GB. | 1st Sep 1919 | Morton \ M11 img219 | |
| With a sketch requesting an inquiry into the production of sylphon tubing for a 40/50 HP chassis. | 23th Sep 1919 | Morton \ M11 img220 | |
| Parts to be fitted to a car for a 10,000-mile test and their current status. | 18th Sep 1919 | Morton \ M11 img221 | |
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