| Description | Date | Identifier | |
| Test of the petrol pump and autovac system. | 27th Jun 1929 | Box 5a \ 2 02-page121 | |
| Letter discussing an oil pump adaptor to fix a leak and seeking recommendations on oiling intervals for various components. | 27th Jun 1929 | Box 5a \ 2 02-page122 | |
| Instructions for testing experimental car 21-EX for engine noise, body booming and squeaking servos. | 28th Jun 1929 | Box 5a \ 2 02-page123 | |
| Stopping servo squeaking and a proposal to test a Phantom front axle on an S.S. chassis to improve steering. | 28th Jun 1929 | Box 5a \ 2 02-page124 | |
| Bench tests for vehicle cooling systems, focusing on radiator design and fan efficiency. | 28th Jun 1929 | Box 5a \ 2 02-page125 | |
| Instructions for vehicle testing and research, covering adjustments to the fan, axle, engine mounting, and steering. | 28th Jun 1929 | Box 5a \ 2 02-page126 | |
| Completion of 9,000-mile tests on a 20 HP car and planning further experimental tests on a 21-EX car in France. | 28th Jun 1929 | Box 5a \ 2 02-page127 | |
| Telegram regarding the completion of a car and its subsequent departure for Grenoble. | 29th Jun 1909 | Box 5a \ 2 02-page128 | |
| Communication regarding a telegram about the completion of a nine-thousand-mile car trial and handover arrangements. | 28th Jun 1929 | Box 5a \ 2 02-page129 | |
| 9,000-mile performance and condition report on engine unit 17-I-IV. | 29th Jun 1929 | Box 5a \ 2 02-page130 | |
| Performance and issues of various engine components after mileage testing. | 29th Jun 1929 | Box 5a \ 2 02-page131 | |
| Test report detailing the performance of various vehicle components after mileage. | 29th Jun 1929 | Box 5a \ 2 02-page132 | |
| Condition report on various vehicle components following mileage testing. | 29th Jun 1929 | Box 5a \ 2 02-page133 | |
| Vehicle inspection report detailing the condition of axle, suspension, and drivetrain components after testing. | 29th Jun 1929 | Box 5a \ 2 02-page134 | |
| Condition report on various vehicle components after mileage testing, noting failures and required modifications. | 29th Jun 1929 | Box 5a \ 2 02-page135 | |
| Vehicle inspection and performance test report detailing the condition of various components. | 29th Jun 1929 | Box 5a \ 2 02-page136 | |
| 9,000-mile car investigation, detailing issues with the one-shot lubrication system and proposing revised maintenance intervals. | 29th Jun 1929 | Box 5a \ 2 02-page137 | |
| Letter concerning a delay with a 20-HP car and instructions for car ZI-EI. | 30th Jun 1929 | Box 5a \ 2 02-page138 | |
| Cancelled travel arrangements, a radiator fan experiment, and a detailed analysis of a Bijur oil pump leak. | 1st Jul 1929 | Box 5a \ 2 02-page139 | |
| Issues with one-shot lubrication, rear shock dampers, and cooling system performance. | 1st Jul 1929 | Box 5a \ 2 02-page140 | |
| Test report on vehicle water temperature and cooling system performance under various conditions. | 1st Jul 1939 | Box 5a \ 2 02-page141 | |
| Note requesting another test drive for the 20 HP 10,000 Miles Car after its return from France, before it is sent to Derby. | 1st Jul 1939 | Box 5a \ 2 02-page142 | |
| Telegram enquiry regarding the fitting of a standard Phantom front axle with short hubs. | 4th Jul 1929 | Box 5a \ 2 02-page143 | |
| Investigations into failures concerning petrol supply, petrol gauge, oil pump, and battery box. | 5th Jul 1922 | Box 5a \ 2 02-page144 | |
| Oil leakage onto brakes, insufficient bodywork clearance, and silencer backfires found during vehicle testing. | 7th Jul 1929 | Box 5a \ 2 02-page145 | |
| Vehicle test results following alterations to the autovac, steering, and bijur pump. | 7th Jul 1929 | Box 5a \ 2 02-page146 | |
| Adjustments and tests for steering, cooling, carburettor backfire, and oil pump leakage. | 8th Jul 1929 | Box 5a \ 2 02-page147 | |
| Communication with Paris about a front axle and observations on steering after altering the body. | 14th Sep 1914 | Box 5a \ 2 02-page148 | |
| Page with a handwritten reference number and date at the top. | 14th Sep 1914 | Box 5a \ 2 02-page149 | |
| Request for the return of car 14-G4 to Derby, as it may be needed for a 20 HP car delivery to France. | 31th Jan 1930 | Box 5a \ 2 02-page150 | |
| Confirmation of preparing documents for Chassis 14-G-IV to be taken to France on a Touring Acquit. | 4th Feb 1930 | Box 5a \ 2 02-page151 | |
| Clutch modifications for a 20 HP 10,000-mile test, including increasing spring load and pedal stroke. | 6th Feb 1930 | Box 5a \ 2 02-page152 | |
| Proposal to increase the thickness of rear brake shoe linings for a 20 HP 10,000-mile test. | 6th Feb 1930 | Box 5a \ 2 02-page153 | |
| Proposal to reduce direct braking on a 20 HP car by altering the rear brake differential lever during a 10,000-mile test. | 6th Feb 1930 | Box 5a \ 2 02-page154 | |
| Letter confirming the application for a touring permit for a client's vehicle, detailing car specifications and financial arrangements. | 6th Feb 1930 | Box 5a \ 2 02-page155 | |
| Requesting confirmation regarding any alterations. | 8th Feb 1930 | Box 5a \ 2 02-page156 | |
| Second report of the design committee detailing modifications for the 25 HP model. | 7th Feb 1930 | Box 5a \ 2 02-page157 | |
| Modification to the brake leverage on Phantom II models, with a recommendation for retrospective fitting. | 1st Feb 1930 | Box 5a \ 2 02-page158 | |
| List of modifications for a 20 HP Chassis after 10,000 miles, specifically for the clutch and footbrakes. | 10th Feb 1930 | Box 5a \ 2 02-page159 | |
| Specifications and component modifications for a 10,000-mile test on vehicle 14-G4. | 11th Feb 1930 | Box 5a \ 2 02-page160 | |
| Insurance for a 20 HP car and its crew for a 10,000 miles test in France. | 17th Feb 1930 | Box 5a \ 2 02-page161 | |
| Logistics for a 20 HP car undergoing a 10,000-mile test. | 17th Feb 1930 | Box 5a \ 2 02-page162 | |
| Arranging a meeting at Bignalls Corner for a 20 HP car undergoing a 10,000 miles test. | 18th Feb 1930 | Box 5a \ 2 02-page163 | |
| Post office telegraph confirming safe arrival in Chateauroux. | 22th Feb 1930 | Box 5a \ 2 02-page164 | |
| The uninhabitable condition of a garage and delays to work. | 23th Feb 1930 | Box 5a \ 2 02-page165 | |
| Progress report on car performance tests, detailing issues with the rear axle and the unavailability of a garage. | 24th Feb 1930 | Box 5a \ 2 02-page166 | |
| Vehicle performance tests regarding acceleration, consumption and dynamo output, with an update on garage construction. | 25th Feb 1930 | Box 5a \ 2 02-page167 | |
| The repair of a broken exhaust pipe and the resumption of mileage testing from Châteauroux, France. | 26th Feb 1930 | Box 5a \ 2 02-page168 | |
| Dynamo output chart for car 18-G4 and the potential harm of the charging rate. | 27th Feb 1930 | Box 5a \ 2 02-page169 | |
| Effects of high dynamo output on battery charging and temperature. | 28th Feb 1930 | Box 5a \ 2 02-page170 | |
| Reporting on the delayed start of a 10,000-mile endurance run on a 20 HP car in France. | 28th Feb 1930 | Box 5a \ 2 02-page171 | |
| Telegram reporting the failure of a front housing of a pinion hypoid axle. | 28th Oct 1935 | Box 5a \ 2 02-page172 | |
| The failure of a front pinion/hypoid axle housing, detailing oil leakage and lateral movement. | 28th Feb 1930 | Box 5a \ 2 02-page173 | |
| Chasing up missing daily reports for a 10,000-mile test car. | 7th Feb 1930 | Box 5a \ 2 02-page174 | |
| Report regarding a pinion bearing failure on a hypoid axle during a 20 HP 10,000-mile test. | 1st Mar 1930 | Box 5a \ 2 02-page175 | |
| Vehicle faults including a brake squeak, an oil leak from the hypoid axle, and an unsteady front end. | 1st Mar 1930 | Box 5a \ 2 02-page176 | |
| Vehicle mechanical failures concerning manifold washers, exhaust pipes, an axle, and a camshaft. | 2nd Mar 1930 | Box 5a \ 2 02-page177 | |
| Drawing of an exhaust manifold for a 25 HP engine, noting several studs and a break. | 3rd Mar 1930 | Box 5a \ 2 02-page178 | |
| Examination of a worn pinion bearing and the oil level in shock absorbers. | 3rd Mar 1930 | Box 5a \ 2 02-page179 | |
| Telegram from Hancock regarding the availability of a trials car axle in Paris and asking for the arrival date of a new one. | | Box 5a \ 2 02-page180 | |
| Telegram reporting an axle failure due to wear of ball races, requiring a new pinion. | 4th Mar 1930 | Box 5a \ 2 02-page181 | |
| Correspondence regarding the despatch of a replacement hypoid axle and propeller shaft to France. | 4th Mar 1930 | Box 5a \ 2 02-page182 | |
| Sourcing of a replacement axle from Paris following a telegram about a damaged propeller shaft. | 4th Sep 1930 | Box 5a \ 2 02-page183 | |
| Hypoid axle failure caused by a worn ball bearing on the bevel pinion. | 12th Nov 1945 | Box 5a \ 2 02-page184 | |
| Graph showing petrol consumption, plotting miles per hour against miles per gallon for a 20/25 HP model. | 25th Feb 1936 | Box 5a \ 2 02-page185 | |
| Graph of dynamo output in amps versus speed in MPH for a 12 coil armature modification, with and without lights on. | 3rd Feb 1930 | Box 5a \ 2 02-page186 | |
| Blueprint graph showing top gear acceleration, plotting speed in miles per hour against time in seconds. | 25th Feb 1930 | Box 5a \ 2 02-page187 | |
| Graph showing top gear acceleration performance for a 20/25 HP vehicle. | 25th May 1934 | Box 5a \ 2 02-page188 | |
| Acceleration data showing time taken for speed intervals and calculated acceleration. | 19th Feb 1930 | Box 5a \ 2 02-page189 | |
| Multiple vehicle failures, concerning the hypoid axle, exhaust manifold, and front wing stays. | 6th Mar 1930 | Box 5a \ 2 02-page190 | |
| Issues with rear shock-damper links, a starter carburetter control tap, and front wheel brakes. | 9th Mar 1930 | Box 5a \ 2 02-page191 | |
| Correspondence regarding the shipment and repair of a rear axle, an oil leak, and other vehicle repairs. | 9th Mar 1930 | Box 5a \ 2 02-page192 | |
| Telegram from Chateauroux to Derby regarding an axle that arrived in Paris. | 11th Mar 1930 | Box 5a \ 2 02-page193 | |
| Letter discussing ongoing issues with rear shock absorbers, dash-board brackets, and the height of the gear-box. | 11th Mar 1930 | Box 5a \ 2 02-page194 | |
| Technical memorandum discussing suspension adjustments, including spring rates, shock absorber loads, and rear brake leverage. | 11th Mar 1930 | Box 5a \ 2 02-page195 | |
| 5,000-mile test report on engine unit 14 GIV, detailing performance and issues with the exhaust manifold, valves, and suspension. | 12th Feb 1930 | Box 5a \ 2 02-page196 | |
| Test report detailing the performance and condition of various engine and electrical components. | 12th Feb 1930 | Box 5a \ 2 02-page197 | |
| Test report on the performance and condition of various vehicle components and modifications after a 5,000-mile run. | 12th Feb 1930 | Box 5a \ 2 02-page198 | |
| Vehicle inspection report detailing the condition of various components and noting any faults or repairs. | 3rd Mar 1930 | Box 5a \ 2 02-page199 | |
| Logistics for completing the final 1,000 miles of a 9,000-mile car test. | 3rd Mar 1930 | Box 5a \ 2 02-page200 | |
| Letter regarding lubrication problems in rear shock absorber connecting links. | 7th Feb 1912 | Box 5a \ 2 02-page201 | |
| Telegram reporting that the exhaust manifold has broken again after new brackets were fitted. | 25th Aug 1932 | Box 5a \ 2 02-page202 | |
| Final stages of a 10,000-mile test for a 20/25 HP Chassis. | 13th Mar 1930 | Box 5a \ 2 02-page203 | |
| Instructions regarding car testing in France, return to England, and fitting a modified exhaust system. | 13th Mar 1930 | Box 5a \ 2 02-page204 | |
| Vehicle components including shock dampers, dashboard brackets, axle performance, and spring behavior. | 13th May 1930 | Box 5a \ 2 02-page205 | |
| Investigation into axle component wear and a proposed theory related to braking and universal joints. | 14th Mar 1930 | Box 5a \ 2 02-page206 | |
| Telegram from Hancock to Hives in Derby, requesting a new exhaust manifold as the present one is hopeless. | 14th Mar 1930 | Box 5a \ 2 02-page207 | |
| Telegram to Hancock confirming the despatch of an exhaust manifold. | 14th Mar 1930 | Box 5a \ 2 02-page208 | |
| Two failures, a hypoid axle and exhaust system, during a 20 HP 10,000-mile test in France. | 14th Mar 1930 | Box 5a \ 2 02-page209 | |
| Component failures, modifications, and arrangements for extended testing in France. | 14th Mar 1938 | Box 5a \ 2 02-page210 | |
| Vehicle's recurring exhaust manifold failure, a new axle's performance, and engine roughness at high speed. | 14th Mar 1930 | Box 5a \ 2 02-page211 | |
| Recurring exhaust valve failure and exhaust system cracking during car testing. | 14th Nov 1928 | Box 5a \ 2 02-page212 | |
| The testing of a new rear axle, detailing issues with vibration, overrun notes, and slackness when hot. | 14th Jan 1930 | Box 5a \ 2 02-page213 | |
| Letter regarding the fitting of a new exhaust system and the completion of vehicle mileage testing. | 16th Mar 1930 | Box 5a \ 2 02-page214 | |
| Letter detailing test results and a proposed solution for inadequate lubrication of shock absorber connections. | 17th Mar 1930 | Box 5a \ 2 02-page215 | |
| Design drawing for an inner ball pad (lower). | 15th Dec 1925 | Box 5a \ 2 02-page216 | |
| Blueprint for the machining and specification of an inner top ball pad. | 19th Aug 1924 | Box 5a \ 2 02-page217 | |
| Arrangement of a rear hydraulic shock damper for a 20 HP vehicle. | 17th May 1930 | Box 5a \ 2 02-page218 | |
| Vehicle testing, detailing issues with the exhaust manifold, brakes, and frame distortion. | 17th Mar 1930 | Box 5a \ 2 02-page219 | |
| Status and issues with various vehicle components. | 10th Mar 1930 | Box 5a \ 2 02-page220 | |
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