Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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Letter from The Lucas Electrical Company Ltd. regarding delivery delays for Dynamos and Gun Metal Switch Boxes.18th Jun 1920Box 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 1920Box 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 1920Box 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 1920Box 36 \ 4  scan 091
The high failure rate of Lucas Dynamos and a subsequent visit from their electrician.20th Jul 1920Box 36 \ 4  scan 092
Comparing Smith 2D and Lucas E.575 dynamos and discussing improvements.23th Jul 1920Box 36 \ 4  scan 093
Performance issues with dynamos and arrangements with supplier Messrs. Lucas.23th Jul 1920Box 36 \ 4  scan 094
A scheme to adjust dynamo output by rotating the brushes.26th Jul 1920Box 36 \ 4  scan 095
Request to modify a chassis dynamo to eliminate an electrical hum.26th Jul 1927Box 36 \ 4  scan 096
Requesting information on the alteration made to silence the E.575 dynamo.27th Jul 1920Box 36 \ 4  scan 097
Silencing the Lucas E.575 dynamo by adjusting the control brush.27th Jul 1920Box 36 \ 4  scan 098
Dynamo noise reduction and output testing by adjusting the position of the control brush.27th Jul 1920Box 36 \ 4  scan 099
Testing and subsequent return of dynamo R.1860 for stock.28th Jul 1920Box 36 \ 4  scan 100
Belt adjustment range for Lucas and Smith dynamos.28th Jul 1920Box 36 \ 4  scan 101
Test results for a Lucas E575 Dynamo, detailing control brush standards.29th Jul 1932Box 36 \ 4  scan 102
Instruction sheet with a handwritten table of test results for speed, amperage, and voltage.24th Jan 1919Box 36 \ 4  scan 103
Test data for a Lucas [5]75 Dynamo, model R1869, detailing amperes and volts at various speeds.29th Jul 1920Box 36 \ 4  scan 104
Test record sheet showing measurements of Speed, Amperes, and Volts.24th Jan 1919Box 36 \ 4  scan 105
The performance and silencing of the Lucas E.575 dynamo.30th Jul 1920Box 36 \ 4  scan 106
Investigation into a hum by adjusting the control brush on a bench and a rig.30th Jul 1920Box 36 \ 4  scan 107
Maximum allowance for modifying the Control Brush on a chassis dynamo.3rd Aug 1920Box 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 1920Box 36 \ 4  scan 109
Letter to Lucas Electrical Co. Ltd. regarding performance tests and specifications for the Dynamo E.575.4th Aug 1920Box 36 \ 4  scan 110
Status of parts held up for 'N' and 'O' series vehicles.4th Aug 1920Box 36 \ 4  scan 111
Graph showing the output curves for a Production Lucas E 575 dynamo, plotting amperes against speed.5th Aug 1920Box 36 \ 4  scan 112
Graph showing the variation of ampere output against lever position for different dynamo models at various speeds.9th Aug 1920Box 36 \ 4  scan 113
Heavily faded and mostly illegible handwritten document with a purple ink stamp.9th Aug 1920Box 36 \ 4  scan 114
Vehicle performance observations and required maintenance for chassis EX-2.10th Aug 1920Box 36 \ 4  scan 115
Extract detailing jobs carried out on the Hawk-Northcliffe chassis, concerning the dynamo and steering.17th Aug 1920Box 36 \ 4  scan 116
Extract detailing electrical troubles experienced with imported chassis.19th Aug 1920Box 36 \ 4  scan 117
Extract detailing troubles with electrical equipment on new imported chassis.19th Aug 1920Box 36 \ 4  scan 118
Query regarding the differing behavior of Smith and Lucas machines when a fuse blows or a disconnection occurs.24th Aug 1920Box 36 \ 4  scan 119
To Royce regarding the possibility of machine failure due to blown fuses.25th Aug 1920Box 36 \ 4  scan 120
Report comparing the electrical installation and faults on experimental cars 1.EX and 6.EX.25th Aug 1920Box 36 \ 4  scan 121
Relocating the distributing board to improve accessibility when removing cylinders.25th Aug 1920Box 36 \ 4  scan 122
Fuse systems for Lucas & Smith dynamos, discussing overheating (roasting) conditions.25th Aug 1920Box 36 \ 4  scan 123
Preventing damage from interchanging main and field fuses on a distribution board.25th Aug 1920Box 36 \ 4  scan 124
Overheating of a Smith Dynamo, its cause, and proposed modifications to wiring and instructions.26th Aug 1920Box 36 \ 4  scan 125
Modifications and work carried out on the 1.EX experimental car.31th Aug 1920Box 36 \ 4  scan 126
Explaining the reason for the absence of fuses in the lighting circuits on chassis 46-LW.3rd Sep 1920Box 36 \ 4  scan 127
Return of a faulty Lucas dynamo from an experimental car for examination and repair.10th Sep 1920Box 36 \ 4  scan 128
Letter to Lucas Electrical regarding the return of a faulty dynamo from an experimental car.10th Sep 1920Box 36 \ 4  scan 129
Letter from the Lucas Electrical Company regarding the examination of a dynamo from an experimental car.11th Sep 1920Box 36 \ 4  scan 130
Response to a query addressing issues with battery discharge, dynamo operation, and drive belt adjustments.24th Sep 1920Box 36 \ 4  scan 131
Weaknesses in an electrical system and plans for an improved dynamo.24th Sep 1920Box 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 1920Box 36 \ 4  scan 133
Instructions regarding the receipt of a replacement Lucas Dynamo for a burnt-out unit on car 4 EX.11th Oct 1920Box 36 \ 4  scan 134
Test results of a Smith dynamo and comparing fuse arrangements with Lucas and Bosch systems.1st Oct 1920Box 36 \ 4  scan 135
Continued page discussing the design of a dynamo armature, referencing previous Royce Limited machines.5th Oct 1920Box 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 1920Box 36 \ 4  scan 137
Generator cut-in speeds and battery issues, with a recommendation for the Bijur machine.7th Oct 1920Box 36 \ 4  scan 138
Noise issues with the Lucas Dynamo E.575, related to substituting aluminium end frames for cast iron ones.11th Oct 1920Box 36 \ 4  scan 139
Material change from cast iron to aluminium for a Lucas dynamo end cover and its effect on noise.13th Oct 1920Box 36 \ 4  scan 140
Technical note discussing the engineering priority of quietness over high power.27th May 1930Box 36 \ 4  scan 141
Material change for the Lucas Dynamo E.575 end frame, reverting from aluminium back to cast iron.13th Oct 1920Box 36 \ 4  scan 142
Trade-off between reducing the maximum output and achieving silence for the Lucas E.575 Dynamo.20th Oct 1920Box 36 \ 4  scan 143
Investigation into the cause of singing in a Lucas E.575 dynamo and a potential solution.20th Jul 1920Box 36 \ 4  scan 144
Instructions on how to eliminate or minimize a singing noise from the dynamo.24th Jan 1919Box 36 \ 4  scan 145
Instructions regarding a singing noise from the control brush at approximately 800 RPM.24th Jan 1919Box 36 \ 4  scan 146
Observations on machine noise related to bearing condition and dynamo performance.24th Jan 1919Box 36 \ 4  scan 147
Material change of an end cover for a Lucas Dynamo and the communication procedure with the supplier.20th Oct 1920Box 36 \ 4  scan 148
The cause and mitigation of 'singing' in a Lucas E.575 dynamo.21th Oct 1920Box 36 \ 4  scan 149
Observation report on machine singing issues related to bearings and control brush positioning.21th Oct 1920Box 36 \ 4  scan 150
Cover letter forwarding a report from America regarding chassis troubles and electrical systems on post-war cars.22th Oct 1920Box 36 \ 4  scan 151
Troubleshooting dynamo charging issues on Post War Cars, specifically regarding the cutting-in speed.7th Oct 1920Box 36 \ 4  scan 152
Letter to Mr. Claude Johnson regarding dynamo troubles on older cars, suggesting belt issues are the common cause.7th Oct 1920Box 36 \ 4  scan 153
Letter discussing issues with battery charging on post-war cars and comparing generator performance to American vehicles.23th Oct 1920Box 36 \ 4  scan 154
Letter concerning difficulties with Lucas generators and a request for replacements from Derby.23th Oct 1920Box 36 \ 4  scan 155
Test results on the effect of retarding the control brush on Lucas E575 dynamo output.25th Oct 1920Box 36 \ 4  scan 156
Instructions detailing test results for dynamos R1869 and R2159.24th Jan 1919Box 36 \ 4  scan 157
Technical memo discussing the late cutting in point of the dynamo on post-war cars.25th Oct 1920Box 36 \ 4  scan 158
Dynamo cutting-in speed, RPM, and the effect of third brush adjustment.25th Oct 1920Box 36 \ 4  scan 159
Relaying a response from Lucas Electrical Co. Ltd. regarding noise and output of the E.575 Dynamotor.3rd Nov 1920Box 36 \ 4  scan 160
Testing procedures for a low output Lucas E.575 Dynamo.4th Nov 1920Box 36 \ 4  scan 161
Electrical system failures, wiring issues, and luggage carrier fixing.11th Nov 1920Box 36 \ 4  scan 162
Performance graph comparing the ampere output of various dynamos at different speeds and temperatures.11th Nov 1938Box 36 \ 4  scan 163
The reverse of a document with handwritten annotations, a partial label, and a company date stamp.17th Dec 1926Box 36 \ 4  scan 164
Letter from Rolls-Royce of America discussing discrepancies and improvements for noisy Lucas dynamos on post-war cars.12th Nov 1920Box 36 \ 4  scan 165
Guide on how to cure noise from Lucas dynamos by adjusting the control brush.20th Aug 1920Box 36 \ 4  scan 166
Summary of output results in Amperes from Lucas E.575 dynamos at various speeds.16th Nov 1920Box 36 \ 4  scan 167
Instructions detailing the field circuit current and resistance for a Lucas E575 dynamo.17th Nov 1920Box 36 \ 4  scan 168
Performance of the Rotax Type A.T. 12 dynamo and other inherently controlled dynamos.17th Nov 1920Box 36 \ 4  scan 169
Performance evaluation and construction overview of a four-pole dynamo, deeming it unsuitable for purpose under hot conditions.17th Nov 1920Box 36 \ 4  scan 170
Comparison of the performance curves for Lucas, Smith, and Rotax dynamos.17th Nov 1920Box 36 \ 4  scan 171
Continuation of a report discussing results for the U.S.A. Bosch dynamo.17th Nov 1920Box 36 \ 4  scan 172
Dynamo's performance and battery charging requirements under different driving conditions.25th Nov 1920Box 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 1920Box 36 \ 4  scan 174
Final position on the car's dynamo, highlighting the need for extensive testing.25th Nov 1920Box 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 1920Box 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 1920Box 36 \ 4  scan 177
Test results on Lucas dynamos regarding electrical equipment for post-war cars.13th Dec 1920Box 36 \ 4  scan 178
The operating voltage specifications for a Lucas electrical cutout, comparing cold and hot conditions.13th Dec 1920Box 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 1920Box 36 \ 4  scan 180
Technical memo proposing the use of a Lucas A400 dynamo for charging at very low speeds.4th Jan 1921Box 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 1921Box 36 \ 4  scan 182
Cause and potential solution for a noisy Lucas dynamo.12th Jan 1921Box 36 \ 4  scan 183
Cabled reply about dynamo choices, recommending to continue with Lucas for the time being.12th Jan 1921Box 36 \ 4  scan 184
Instructions regarding the exchange of Lucas dynamos and noting one is electrically noisy.21th Jan 1921Box 36 \ 4  scan 185
Sending a noisy Lucas E.575 dynamo for testing on car 2 EX to demonstrate hum removal.21th Jan 1921Box 36 \ 4  scan 186
Query regarding the choice between ordering Lucas dynamos or using an R.R. scheme for chassis wiring.2nd Jan 1922Box 36 \ 4  scan 187


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