| Description | Date | Identifier | |
| Modification form for chassis parts, specifying the introduction of a new part for the H.2 series. | 7th Mar 1931 | Box 62 \ 3 scan0154 | |
| Letter to Rolls-Royce of America regarding dynamo modifications for 20/25 HP cars. | 30th Jan 1931 | Box 62 \ 3 scan0155 | |
| Letter explaining the comparative basis for two dynamo output performance curves. | 30th Jan 1931 | Box 62 \ 3 scan0156 | |
| Production test report for 48 coil medium output dynamo machines. | 23th Jan 1931 | Box 62 \ 3 scan0157 | |
| Production test results for 48 coil high output dynamos (EJB modification) for narrow brush machines of the SS type. | 17th Oct 1930 | Box 62 \ 3 scan0158 | |
| Production test results for 48 Coil High Output Machines with EJB Modification. | 17th Oct 1930 | Box 62 \ 3 scan0159 | |
| Performance comparison log sheet for various 48 coil medium output dynamo machines. | 23th Jan 1931 | Box 62 \ 3 scan0160 | |
| Performance comparison table for various dynamo models. | 1st Apr 1927 | Box 62 \ 3 scan0161 | |
| Performance comparison table for various dynamo models based on a routine procedure. | 1st Apr 1927 | Box 62 \ 3 scan0162 | |
| Two-rate charge scheme and comparing different dynamo output modifications and their performance curves. | 30th Jan 1931 | Box 62 \ 3 scan0163 | |
| Technical points on dynamo performance and headlamp bulb wattage. | 30th Jan 1931 | Box 62 \ 3 scan0164 | |
| Continued note on the disadvantages of fitting more powerful light bulbs. | 31th Jan 1931 | Box 62 \ 3 scan0165 | |
| Comparison of standard and experimental solder compositions for commutators, noting their different melting points. | 31th Jan 1931 | Box 62 \ 3 scan0166 | |
| Implementation of a two-rate charge scheme and dynamo modifications for several experimental chassis. | 31th Jan 1931 | Box 62 \ 3 scan0167 | |
| Query and report on improving the dynamo control brush accessibility for the 20/25 HP model, comparing it to the Phantom. | 31th Jan 1931 | Box 62 \ 3 scan0168 | |
| Suggestions for 20/25 dynamo improvements to cheapen production. | 31th Jan 1931 | Box 62 \ 3 scan0169 | |
| Continuation page outlining potential design changes for brush tops and brush flex tags. | 31th Jan 1931 | Box 62 \ 3 scan0170 | |
| Specifications for a 56 coil armature with reduced teeth and heavier conductors than standard. | 2nd Feb 1931 | Box 62 \ 3 scan0171 | |
| Experiment to test commutator solder with a 14° higher melting point. | 18th Mar 1931 | Box 62 \ 3 scan0172 | |
| Drawing of standard and experimental 40/50 56 coil armature slots with dimensions. | 4th Feb 1931 | Box 62 \ 3 scan0173 | |
| Clarifying the process for submitting recommendations for chassis cost reductions. | 4th Feb 1931 | Box 62 \ 3 scan0174 | |
| The standardisation of the dynamo and two-rate charge scheme for the 20/25 chassis. | 1st Feb 1931 | Box 62 \ 3 scan0175 | |
| Design and instructioning of a 56 coil 20/25 dynamo armature with modified slots and air gap. | 5th Feb 1931 | Box 62 \ 3 scan0176 | |
| Comparison drawing of a proposed and a standard dynamo slot and tooth for different winding gauges. | 5th Feb 1931 | Box 62 \ 3 scan0177 | |
| Recommendations for cheapening the production of electrical equipment and the testing of a modified dynamo. | 5th Feb 1931 | Box 62 \ 3 scan0178 | |
| Requesting approval for a die-cast dynamo component and fixed control brush for the 20/25 HP Chassis. | 5th Feb 1931 | Box 62 \ 3 scan0179 | |
| Investigation into brush noise on 20/25 model dynamo brushes, referencing specified clearances. | 5th Feb 1931 | Box 62 \ 3 scan0180 | |
| Instructions discussing component tolerances, brush dust, and the effects of backward running tests. | 8th Dec 1924 | Box 62 \ 3 scan0181 | |
| Issues with secular variation of electrical output and the bedding of brushes. | 8th Dec 1924 | Box 62 \ 3 scan0182 | |
| Instructions regarding bedding in, testing, and preventing sticking of machine brushes. | 8th Dec 1924 | Box 62 \ 3 scan0183 | |
| Recommendation to standardise the medium output dynamo for the 20/25 chassis. | 6th Feb 1931 | Box 62 \ 3 scan0184 | |
| Methods for improving dynamo output by modifying armature reluctance and dimensions. | 7th Feb 1931 | Box 62 \ 3 scan0185 | |
| Proposed modifications to the dynamo's dimensions and armature. | 1st Feb 1931 | Box 62 \ 3 scan0186 | |
| Testing of dynamo brushes with a 30° bevel and special springs on a 40/50 Phantom I. | 9th Feb 1931 | Box 62 \ 3 scan0187 | |
| Letter from Rolls-Royce of America to Rolls-Royce Ltd. regarding the repair of a 25 HP Generator. | 9th Feb 1931 | Box 62 \ 3 scan0188 | |
| Confirming the inability to introduce a 48 coil dynamo for the 20/25 HP Chassis and requesting a control brush position for the current 56 coil machine. | 10th Feb 1931 | Box 62 \ 3 scan0189 | |
| Drop in dynamo output on the Phantom II L.H. chassis after increased mileage. | 1st Feb 1931 | Box 62 \ 3 scan0190 | |
| Request to have a dynamo commutator skimmed due to excessive sparking before a 10,000-mile test of special brushes. | 24th Feb 1921 | Box 62 \ 3 scan0191 | |
| Requesting the skimming of a dynamo commutator due to excessive sparking, in preparation for a 10,000-mile test. | 1st Feb 1931 | Box 62 \ 3 scan0192 | |
| Request to manufacture a specially wound armature and a set of four trial poles for a 20/25 HP chassis dynamo. | 11th Feb 1931 | Box 62 \ 3 scan0193 | |
| Recalling the standardisation sheet for the 20/25 48 coil medium output dynamo. | 2nd Feb 1931 | Box 62 \ 3 scan0194 | |
| Response regarding the control brush position specification for a 20/25 Dynamo. | 2nd Feb 1931 | Box 62 \ 3 scan0195 | |
| Urgent experimental instruction regarding a 20/25 chassis dynamo 56 coil armature. | 2nd Feb 1931 | Box 62 \ 3 scan0196 | |
| Two issues with the Phantom II dynamo output: a drop in amperage and overheating solder. | 12th Feb 1931 | Box 62 \ 3 scan0197 | |
| The drop in output of the 48 coil P.2. dynamo on the L.H. chassis. | 3rd Feb 1931 | Box 62 \ 3 scan0198 | |
| Minor complaints pertaining to the operation of dynamo brushes. | 3rd Feb 1931 | Box 62 \ 3 scan0199 | |
| Experiments and production test issues related to dynamo brushes for the Phantom. | 3rd Feb 1931 | Box 62 \ 3 scan0200 | |
| Continued discussion on dynamo output related to brush material, bedding, and operational variations. | 3rd Feb 1931 | Box 62 \ 3 scan0201 | |
| Brush bedding, sticking, clearances, and cleaning procedures. | 3rd Feb 1931 | Box 62 \ 3 scan0202 | |
| Electrical experimental record sheet for a road test of British Carbons Brushes, grade equal to EG2. | 1st Jan 1932 | Box 62 \ 3 scan0203 | |
| Electrical experimental record sheet for British Carbons Brushes, Grade B. | 5th Mar 1932 | Box 62 \ 3 scan0204 | |
| Instructions and examination report regarding a noisy dynamo from a car. | 14th Feb 1931 | Box 62 \ 3 scan0205 | |
| Test report on a machine, noting its output, sparking brushes, and a rumbling bearing. | 8th Dec 1924 | Box 62 \ 3 scan0206 | |
| Fitting a standard dynamo to 18.G.IV and providing an output chart. | 26th Feb 1931 | Box 62 \ 3 scan0207 | |
| Graph of dynamo output in amps versus speed in MPH under different electrical load conditions. | 23th Feb 1931 | Box 62 \ 3 scan0208 | |
| Expressing frustration about the lack of progress and high costs regarding the standardisation of a 48 coil armature dynamo. | 2nd Mar 1931 | Box 62 \ 3 scan0209 | |
| Requesting an increase in the air gap of a 56 coil P.2. dynamo for re-testing. | 3rd Mar 1931 | Box 62 \ 3 scan0210 | |
| Two-rate charge scheme, confirming a dynamo is ready and instructing to complete switchbox modifications on chassis 22-EX. | 6th Mar 1931 | Box 62 \ 3 scan0211 | |
| Status report on the position of 20/25 48 coil dynamos. | 10th Mar 1931 | Box 62 \ 3 scan0212 | |
| Test report on an experimental 20/25 HP dynamo with modifications, noting its unfavorable performance compared to the standard machine. | 10th Apr 1931 | Box 62 \ 3 scan0213 | |
| Machine experiment, analyzing current draw at different speeds and proposing design improvements. | 8th Dec 1924 | Box 62 \ 3 scan0214 | |
| Instructions regarding machine setup with .020 inch air gaps to maintain output. | 8th Dec 1924 | Box 62 \ 3 scan0215 | |
| Improvements to the 'Phantom' dynamo through testing and modifications. | 13th Apr 1931 | Box 62 \ 3 scan0216 | |
| Request to modify a 40/50 dynamo by boring out the poles to increase the radial air gap. | 3rd Apr 1931 | Box 62 \ 3 scan0217 | |
| Modifications to improve the output and cutting-in speed of the 'Phantom' Dynamo. | 13th Apr 1931 | Box 62 \ 3 scan0218 | |
| Request to modify the air gap on a 25 HP dynamo for further testing. | 4th Apr 1931 | Box 62 \ 3 scan0219 | |
| Proposal to modify 'Phantom II' Dynamos to increase their electrical output for the remaining 35 chassis of the 'M2' Series. | 16th Apr 1931 | Box 62 \ 3 scan0220 | |
| Instructions and test results for 20/25 HP production dynamos. | 4th May 1921 | Box 62 \ 3 scan0221 | |
| Instructions comparing machine configurations based on output, temperature rise, and safety margins. | 8th Dec 1924 | Box 62 \ 3 scan0222 | |
| Instructions regarding the adoption of a two-rate charge switching system for 20/25 cars. | 8th Dec 1924 | Box 62 \ 3 scan0223 | |
| Confirming a verbal agreement for the standardisation of 40/50 dynamos. | 4th May 1931 | Box 62 \ 3 scan0224 | |
| Letter requesting the properties of dynamo brushes previously submitted for testing by British Carbons. | 6th May 1931 | Box 62 \ 3 scan0225 | |
| Letter from British Carbons regarding the grades and specifications of carbon brushes for dynamos. | 9th May 1931 | Box 62 \ 3 scan0226 | |
| Letter from British Carbons requesting samples to make up sample brushes for testing. | 9th May 1931 | Box 62 \ 3 scan0227 | |
| The replacement of a failed dynamo on car 18-GIV. | 9th May 1931 | Box 62 \ 3 scan0228 | |
| Cover letter for the specification of a running test for a 20/25 HP dynamo. | 2nd May 1931 | Box 62 \ 3 scan0229 | |
| Specification for the running test of a 20/25 HP Dynamo. | 12th May 1931 | Box 62 \ 3 scan0230 | |
| The development and testing of improved dynamos for 40/50 and 25 HP models, detailing modifications and performance. | 6th May 1931 | Box 62 \ 3 scan0231 | |
| Internal discussion on dynamo output and battery charging issues related to various driving and lighting conditions. | 6th May 1931 | Box 62 \ 3 scan0232 | |
| Modifications to dynamo charge schemes and output improvements. | 6th May 1931 | Box 62 \ 3 scan0233 | |
| Graph of output speed curves comparing a standard and an improved 48 coil machine for a 40/50 model. | 1st Dec 1930 | Box 62 \ 3 scan0234 | |
| Graph of output speed curves comparing two different dynamo coil machines. | 1st Dec 1930 | Box 62 \ 3 scan0235 | |
| From Sg to Hs discussing the necessity for expense on dynamo armatures following recent tests. | 2nd Jul 1931 | Box 62 \ 3 scan0236 | |
| Dynamo performance, specifically changes to field windings and armatures to manage temperature and output. | 1st Jul 1931 | Box 62 \ 3 scan0237 | |
| Graph of dynamo output speed curves for the Phantom II chassis. | 1st Jul 1931 | Box 62 \ 3 scan0238 | |
| Suggestions for experiments on dynamos and the necessity of increasing their output. | 3rd Jul 1931 | Box 62 \ 3 scan0239 | |
| Dynamo performance, battery life, and modifications to prevent overcharging. | 7th Jul 1938 | Box 62 \ 3 scan0240 | |
| Recommendation to increase the size of the 20/25 dynamo brush flexible for improved current capacity and mechanical strength. | 7th Jul 1931 | Box 62 \ 3 scan0241 | |
| Dynamo performance, battery overcharging, and potential improvements including thermostatic control. | 7th Jul 1931 | Box 62 \ 3 scan0242 | |
| Road test of British Carbons Brushes on a 40/50 dynamo. | 5th Jul 1931 | Box 62 \ 3 scan0243 | |
| The bench and road tests of modified dynamo brush springs to reduce noise. | 9th Sep 1931 | Box 62 \ 3 scan0244 | |
| Three proposals to address the dynamo's cut-in speed in relation to the Hypoid Axle. | 21th Sep 1931 | Box 62 \ 3 scan0245 | |
| Modifications to the dynamo drive and rear end of the crankcase, enclosing original Letters of Change. | 3rd Oct 1931 | Box 62 \ 3 scan0246 | |
| Lack of means for eccentric adjustment of the dynamo pinion centre and a proposed scheme. | 5th Oct 1931 | Box 62 \ 3 scan0247 | |
| Cover sheet for the Production Test Specification of a 20/25 HP Dynamo. | 22th Oct 1931 | Box 62 \ 3 scan0248 | |
| Specification of running test for the 20/25 HP dynamo. | 22th Oct 1931 | Box 62 \ 3 scan0249 | |
| Request to fit up-to-date standard armatures to two experimental dynamos. | 10th Nov 1931 | Box 62 \ 3 scan0250 | |
| Extract from G.W. Hancock's report comparing the output of dynamos on 18-GIV and 19-GIV models. | 16th Nov 1931 | Box 62 \ 3 scan0251 | |
| Letter to Messrs. British Carbons requesting a list and specification for starter motor and dynamo brushes being tested. | 18th Nov 1931 | Box 62 \ 3 scan0252 | |
| Electrical experimental record sheet for mileage and performance tests on Morganite Brushes, part number EG 6630. | 20th Mar 1931 | Box 62 \ 3 scan0253 | |
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