| Description | Date | Identifier | |
| Letter from The Lucas Electrical Company Ltd. regarding delivery delays for Dynamos and Gun Metal Switch Boxes. | 18th Jun 1920 | Box 36 \ 4 scan 088 | |
| Letter concerning the delivery schedule and specifications of Lucas Dynamos, detailing a mix of old and new terminal blocks. | 21th Jun 1920 | Box 36 \ 4 scan 089 | |
| The cause of 'singing' dynamos, suggesting the issue is slack bearings and noting a particularly noisy unit on car 1.EX. | 28th Jun 1920 | Box 36 \ 4 scan 090 | |
| Extract from a report on the electrical systems for chassis 6.EX, comparing Smith and Lucas dynamos and discussing wiring improvements. | 17th Jul 1920 | Box 36 \ 4 scan 091 | |
| The high failure rate of Lucas Dynamos and a subsequent visit from their electrician. | 20th Jul 1920 | Box 36 \ 4 scan 092 | |
| Comparing Smith 2D and Lucas E.575 dynamos and discussing improvements. | 23th Jul 1920 | Box 36 \ 4 scan 093 | |
| Performance issues with dynamos and arrangements with supplier Messrs. Lucas. | 23th Jul 1920 | Box 36 \ 4 scan 094 | |
| A scheme to adjust dynamo output by rotating the brushes. | 26th Jul 1920 | Box 36 \ 4 scan 095 | |
| Request to modify a chassis dynamo to eliminate an electrical hum. | 26th Jul 1927 | Box 36 \ 4 scan 096 | |
| Requesting information on the alteration made to silence the E.575 dynamo. | 27th Jul 1920 | Box 36 \ 4 scan 097 | |
| Silencing the Lucas E.575 dynamo by adjusting the control brush. | 27th Jul 1920 | Box 36 \ 4 scan 098 | |
| Dynamo noise reduction and output testing by adjusting the position of the control brush. | 27th Jul 1920 | Box 36 \ 4 scan 099 | |
| Testing and subsequent return of dynamo R.1860 for stock. | 28th Jul 1920 | Box 36 \ 4 scan 100 | |
| Belt adjustment range for Lucas and Smith dynamos. | 28th Jul 1920 | Box 36 \ 4 scan 101 | |
| Test results for a Lucas E575 Dynamo, detailing control brush standards. | 29th Jul 1932 | Box 36 \ 4 scan 102 | |
| Instruction sheet with a handwritten table of test results for speed, amperage, and voltage. | 24th Jan 1919 | Box 36 \ 4 scan 103 | |
| Test data for a Lucas [5]75 Dynamo, model R1869, detailing amperes and volts at various speeds. | 29th Jul 1920 | Box 36 \ 4 scan 104 | |
| Test record sheet showing measurements of Speed, Amperes, and Volts. | 24th Jan 1919 | Box 36 \ 4 scan 105 | |
| The performance and silencing of the Lucas E.575 dynamo. | 30th Jul 1920 | Box 36 \ 4 scan 106 | |
| Investigation into a hum by adjusting the control brush on a bench and a rig. | 30th Jul 1920 | Box 36 \ 4 scan 107 | |
| Maximum allowance for modifying the Control Brush on a chassis dynamo. | 3rd Aug 1920 | Box 36 \ 4 scan 108 | |
| Clarifying that dynamos are ordered up to the end of the 'O' Series, regarding parts held up for 'N' and 'O' Series. | 4th Aug 1920 | Box 36 \ 4 scan 109 | |
| Letter to Lucas Electrical Co. Ltd. regarding performance tests and specifications for the Dynamo E.575. | 4th Aug 1920 | Box 36 \ 4 scan 110 | |
| Status of parts held up for 'N' and 'O' series vehicles. | 4th Aug 1920 | Box 36 \ 4 scan 111 | |
| Graph showing the output curves for a Production Lucas E 575 dynamo, plotting amperes against speed. | 5th Aug 1920 | Box 36 \ 4 scan 112 | |
| Graph showing the variation of ampere output against lever position for different dynamo models at various speeds. | 9th Aug 1920 | Box 36 \ 4 scan 113 | |
| Heavily faded and mostly illegible handwritten document with a purple ink stamp. | 9th Aug 1920 | Box 36 \ 4 scan 114 | |
| Vehicle performance observations and required maintenance for chassis EX-2. | 10th Aug 1920 | Box 36 \ 4 scan 115 | |
| Extract detailing jobs carried out on the Hawk-Northcliffe chassis, concerning the dynamo and steering. | 17th Aug 1920 | Box 36 \ 4 scan 116 | |
| Extract detailing electrical troubles experienced with imported chassis. | 19th Aug 1920 | Box 36 \ 4 scan 117 | |
| Extract detailing troubles with electrical equipment on new imported chassis. | 19th Aug 1920 | Box 36 \ 4 scan 118 | |
| Query regarding the differing behavior of Smith and Lucas machines when a fuse blows or a disconnection occurs. | 24th Aug 1920 | Box 36 \ 4 scan 119 | |
| To Royce regarding the possibility of machine failure due to blown fuses. | 25th Aug 1920 | Box 36 \ 4 scan 120 | |
| Report comparing the electrical installation and faults on experimental cars 1.EX and 6.EX. | 25th Aug 1920 | Box 36 \ 4 scan 121 | |
| Relocating the distributing board to improve accessibility when removing cylinders. | 25th Aug 1920 | Box 36 \ 4 scan 122 | |
| Fuse systems for Lucas & Smith dynamos, discussing overheating (roasting) conditions. | 25th Aug 1920 | Box 36 \ 4 scan 123 | |
| Preventing damage from interchanging main and field fuses on a distribution board. | 25th Aug 1920 | Box 36 \ 4 scan 124 | |
| Overheating of a Smith Dynamo, its cause, and proposed modifications to wiring and instructions. | 26th Aug 1920 | Box 36 \ 4 scan 125 | |
| Modifications and work carried out on the 1.EX experimental car. | 31th Aug 1920 | Box 36 \ 4 scan 126 | |
| Explaining the reason for the absence of fuses in the lighting circuits on chassis 46-LW. | 3rd Sep 1920 | Box 36 \ 4 scan 127 | |
| Return of a faulty Lucas dynamo from an experimental car for examination and repair. | 10th Sep 1920 | Box 36 \ 4 scan 128 | |
| Letter to Lucas Electrical regarding the return of a faulty dynamo from an experimental car. | 10th Sep 1920 | Box 36 \ 4 scan 129 | |
| Letter from the Lucas Electrical Company regarding the examination of a dynamo from an experimental car. | 11th Sep 1920 | Box 36 \ 4 scan 130 | |
| Response to a query addressing issues with battery discharge, dynamo operation, and drive belt adjustments. | 24th Sep 1920 | Box 36 \ 4 scan 131 | |
| Weaknesses in an electrical system and plans for an improved dynamo. | 24th Sep 1920 | Box 36 \ 4 scan 132 | |
| Communication relaying a fault diagnosis from Lucas Electrical Co. Ltd. concerning an E.575 Dynamo from an experimental car. | 1st Oct 1920 | Box 36 \ 4 scan 133 | |
| Instructions regarding the receipt of a replacement Lucas Dynamo for a burnt-out unit on car 4 EX. | 11th Oct 1920 | Box 36 \ 4 scan 134 | |
| Test results of a Smith dynamo and comparing fuse arrangements with Lucas and Bosch systems. | 1st Oct 1920 | Box 36 \ 4 scan 135 | |
| Continued page discussing the design of a dynamo armature, referencing previous Royce Limited machines. | 5th Oct 1920 | Box 36 \ 4 scan 136 | |
| Extract from a letter listing vehicle faults and issues for discussion, including problems with shock absorbers, steering, and engine components. | 7th Oct 1920 | Box 36 \ 4 scan 137 | |
| Generator cut-in speeds and battery issues, with a recommendation for the Bijur machine. | 7th Oct 1920 | Box 36 \ 4 scan 138 | |
| Noise issues with the Lucas Dynamo E.575, related to substituting aluminium end frames for cast iron ones. | 11th Oct 1920 | Box 36 \ 4 scan 139 | |
| Material change from cast iron to aluminium for a Lucas dynamo end cover and its effect on noise. | 13th Oct 1920 | Box 36 \ 4 scan 140 | |
| Technical note discussing the engineering priority of quietness over high power. | 27th May 1930 | Box 36 \ 4 scan 141 | |
| Material change for the Lucas Dynamo E.575 end frame, reverting from aluminium back to cast iron. | 13th Oct 1920 | Box 36 \ 4 scan 142 | |
| Trade-off between reducing the maximum output and achieving silence for the Lucas E.575 Dynamo. | 20th Oct 1920 | Box 36 \ 4 scan 143 | |
| Investigation into the cause of singing in a Lucas E.575 dynamo and a potential solution. | 20th Jul 1920 | Box 36 \ 4 scan 144 | |
| Instructions on how to eliminate or minimize a singing noise from the dynamo. | 24th Jan 1919 | Box 36 \ 4 scan 145 | |
| Instructions regarding a singing noise from the control brush at approximately 800 RPM. | 24th Jan 1919 | Box 36 \ 4 scan 146 | |
| Observations on machine noise related to bearing condition and dynamo performance. | 24th Jan 1919 | Box 36 \ 4 scan 147 | |
| Material change of an end cover for a Lucas Dynamo and the communication procedure with the supplier. | 20th Oct 1920 | Box 36 \ 4 scan 148 | |
| The cause and mitigation of 'singing' in a Lucas E.575 dynamo. | 21th Oct 1920 | Box 36 \ 4 scan 149 | |
| Observation report on machine singing issues related to bearings and control brush positioning. | 21th Oct 1920 | Box 36 \ 4 scan 150 | |
| Cover letter forwarding a report from America regarding chassis troubles and electrical systems on post-war cars. | 22th Oct 1920 | Box 36 \ 4 scan 151 | |
| Troubleshooting dynamo charging issues on Post War Cars, specifically regarding the cutting-in speed. | 7th Oct 1920 | Box 36 \ 4 scan 152 | |
| Letter to Mr. Claude Johnson regarding dynamo troubles on older cars, suggesting belt issues are the common cause. | 7th Oct 1920 | Box 36 \ 4 scan 153 | |
| Letter discussing issues with battery charging on post-war cars and comparing generator performance to American vehicles. | 23th Oct 1920 | Box 36 \ 4 scan 154 | |
| Letter concerning difficulties with Lucas generators and a request for replacements from Derby. | 23th Oct 1920 | Box 36 \ 4 scan 155 | |
| Test results on the effect of retarding the control brush on Lucas E575 dynamo output. | 25th Oct 1920 | Box 36 \ 4 scan 156 | |
| Instructions detailing test results for dynamos R1869 and R2159. | 24th Jan 1919 | Box 36 \ 4 scan 157 | |
| Technical memo discussing the late cutting in point of the dynamo on post-war cars. | 25th Oct 1920 | Box 36 \ 4 scan 158 | |
| Dynamo cutting-in speed, RPM, and the effect of third brush adjustment. | 25th Oct 1920 | Box 36 \ 4 scan 159 | |
| Relaying a response from Lucas Electrical Co. Ltd. regarding noise and output of the E.575 Dynamotor. | 3rd Nov 1920 | Box 36 \ 4 scan 160 | |
| Testing procedures for a low output Lucas E.575 Dynamo. | 4th Nov 1920 | Box 36 \ 4 scan 161 | |
| Electrical system failures, wiring issues, and luggage carrier fixing. | 11th Nov 1920 | Box 36 \ 4 scan 162 | |
| Performance graph comparing the ampere output of various dynamos at different speeds and temperatures. | 11th Nov 1938 | Box 36 \ 4 scan 163 | |
| The reverse of a document with handwritten annotations, a partial label, and a company date stamp. | 17th Dec 1926 | Box 36 \ 4 scan 164 | |
| Letter from Rolls-Royce of America discussing discrepancies and improvements for noisy Lucas dynamos on post-war cars. | 12th Nov 1920 | Box 36 \ 4 scan 165 | |
| Guide on how to cure noise from Lucas dynamos by adjusting the control brush. | 20th Aug 1920 | Box 36 \ 4 scan 166 | |
| Summary of output results in Amperes from Lucas E.575 dynamos at various speeds. | 16th Nov 1920 | Box 36 \ 4 scan 167 | |
| Instructions detailing the field circuit current and resistance for a Lucas E575 dynamo. | 17th Nov 1920 | Box 36 \ 4 scan 168 | |
| Performance of the Rotax Type A.T. 12 dynamo and other inherently controlled dynamos. | 17th Nov 1920 | Box 36 \ 4 scan 169 | |
| Performance evaluation and construction overview of a four-pole dynamo, deeming it unsuitable for purpose under hot conditions. | 17th Nov 1920 | Box 36 \ 4 scan 170 | |
| Comparison of the performance curves for Lucas, Smith, and Rotax dynamos. | 17th Nov 1920 | Box 36 \ 4 scan 171 | |
| Continuation of a report discussing results for the U.S.A. Bosch dynamo. | 17th Nov 1920 | Box 36 \ 4 scan 172 | |
| Dynamo's performance and battery charging requirements under different driving conditions. | 25th Nov 1920 | Box 36 \ 4 scan 173 | |
| Comparison of Bosch, Lucas, and Bijur dynamo systems, discussing their performance and voltage ratings for use in the cars. | 25th Nov 1920 | Box 36 \ 4 scan 174 | |
| Final position on the car's dynamo, highlighting the need for extensive testing. | 25th Nov 1920 | Box 36 \ 4 scan 175 | |
| Test report on the effect of changing the control brush position on the balancing speed of a Lucas E.575 Dynamo. | 7th Dec 1920 | Box 36 \ 4 scan 176 | |
| Proposing an experiment to reduce noise from a Lucas dynamo by fitting a rigid metal clamp around its carcase. | 9th Dec 1920 | Box 36 \ 4 scan 177 | |
| Test results on Lucas dynamos regarding electrical equipment for post-war cars. | 13th Dec 1920 | Box 36 \ 4 scan 178 | |
| The operating voltage specifications for a Lucas electrical cutout, comparing cold and hot conditions. | 13th Dec 1920 | Box 36 \ 4 scan 179 | |
| Continued memo regarding adjustments to correct late operation, mentioning potential issues with soldering and cutouts, and seeking clarification from a Mr. Olley. | 13th Dec 1920 | Box 36 \ 4 scan 180 | |
| Technical memo proposing the use of a Lucas A400 dynamo for charging at very low speeds. | 4th Jan 1921 | Box 36 \ 4 scan 181 | |
| Query regarding a customer's request from India for a dynamo to charge at very low speeds on a chassis. | 4th Jan 1921 | Box 36 \ 4 scan 182 | |
| Cause and potential solution for a noisy Lucas dynamo. | 12th Jan 1921 | Box 36 \ 4 scan 183 | |
| Cabled reply about dynamo choices, recommending to continue with Lucas for the time being. | 12th Jan 1921 | Box 36 \ 4 scan 184 | |
| Instructions regarding the exchange of Lucas dynamos and noting one is electrically noisy. | 21th Jan 1921 | Box 36 \ 4 scan 185 | |
| Sending a noisy Lucas E.575 dynamo for testing on car 2 EX to demonstrate hum removal. | 21th Jan 1921 | Box 36 \ 4 scan 186 | |
| Query regarding the choice between ordering Lucas dynamos or using an R.R. scheme for chassis wiring. | 2nd Jan 1922 | Box 36 \ 4 scan 187 | |
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