| Description | Date | Identifier | |
| Methods to improve dynamo output by modifying the armature without increasing its dimensions or weight. | 7th Feb 1931 | Box 163 \ 6 img140 | |
| Potential modifications to a dynamo's dimensions and armature. | 1st Feb 1931 | Box 163 \ 6 img141 | |
| Specification sheet for resistances used in a two-rate charge scheme, showing a table of length versus resistance. | 7th Feb 1931 | Box 163 \ 6 img142 | |
| The implementation of a two-rate charge scheme and dynamo on chassis 22-EX. | 3rd Mar 1931 | Box 163 \ 6 img143 | |
| Letter from the American branch in Springfield to the UK branch in Derby requesting information about a switching scheme. | 29th Apr 1931 | Box 163 \ 6 img144 | |
| Letter to Rolls-Royce of America discussing a two-rate charging scheme for dynamos to prevent excessive battery overcharging. | 9th May 1931 | Box 163 \ 6 img145 | |
| Page two of a letter to Mr. Burton in Springfield, Mass., detailing a two-rate charging scheme. | 9th Jan 1931 | Box 163 \ 6 img146 | |
| Standardisation of a chassis switchbox for a two-rate dynamo charge scheme. | 9th Jan 1931 | Box 163 \ 6 img147 | |
| Attached output curve for a 40/50 HP dynamo's two-rate charge scheme for the N.2 series. | 29th May 1931 | Box 163 \ 6 img148 | |
| Graph plotting several curves with a vertical axis labelled 'Voltages' and another line indicating a constant voltage of 14.0. | 5th May 1932 | Box 163 \ 6 img149 | |
| Graph of dynamo output speed curves for the N.2 Series Chassis under various load conditions. | 5th May 1932 | Box 163 \ 6 img150 | |
| Questioning the performance curve and running conditions of a 40/50 HP Dynamo. | 3rd Jun 1931 | Box 163 \ 6 img151 | |
| Output of a 40/50 dynamo and a two-rate charge scheme. | 5th Jun 1931 | Box 163 \ 6 img152 | |
| Letter from the American division to the Derby, England division regarding a two-rate charging scheme. | 5th Jun 1931 | Box 163 \ 6 img153 | |
| Cover letter for the specification of production inspection and test for a 40/50 Dynamo Field Resistance Unit. | 5th Jun 1931 | Box 163 \ 6 img154 | |
| Production inspection and test procedure for a 40/50 Dynamo Field Resistance Unit. | 15th Jun 1931 | Box 163 \ 6 img155 | |
| Modifications for a two-rate charge scheme on car 22-EX. | 5th Jul 1931 | Box 163 \ 6 img156 | |
| Cover note for a revised production inspection and test specification for a Dynamo Field Resistance Unit. | 6th Oct 1931 | Box 163 \ 6 img157 | |
| Production inspection and test procedure for a 40/50 and 20/25 Dynamo Field Resistance Unit. | 16th Oct 1931 | Box 163 \ 6 img158 | |
| Cover note for the Production Test Specification of a 20/25 Switchbox. | 20th Oct 1931 | Box 163 \ 6 img159 | |
| Specification of test procedures for the 20/25 switchbox. | 16th Oct 1931 | Box 163 \ 6 img160 | |
| Technical memorandum discussing the voltage rise on the electrical system and its effect on lamps. | 1st Nov 1931 | Box 163 \ 6 img161 | |
| Dynamo output and battery charging on 10,000-mile test cars. | 19th Nov 1931 | Box 163 \ 6 img162 | |
| Preliminary report on the performance tests of a special experimental dynamo for a 20/25 model. | 14th May 1932 | Box 163 \ 6 img163 | |
| Outlining further experiments and modifications for a 20/25 Dynamo before final approval. | 14th May 1932 | Box 163 \ 6 img164 | |
| The performance and proposed modifications for an experimental half-charge dynamo for the 20/25 chassis. | 21th May 1932 | Box 163 \ 6 img165 | |
| Problem of side lamp bulbs burning out due to dynamo overcharging and comparing charging systems. | 8th Jun 1932 | Box 163 \ 6 img166 | |
| Side lamp over-voltage protection and a dynamo scheme for the 20/25 chassis. | 8th Jun 1932 | Box 163 \ 6 img167 | |
| Issues with the burning of side-lamp bulbs related to battery charging schemes. | 9th Jun 1932 | Box 163 \ 6 img168 | |
| Burning of side lamp bulbs and adjustments to dynamo resistance on the 20-HP chassis. | 9th Jun 1932 | Box 163 \ 6 img169 | |
| Burning of side lamp bulbs on the 20/25 HP model and proposing a multi-rate charging scheme to prevent battery overcharging. | 11th Jun 1932 | Box 163 \ 6 img170 | |
| Modifications to contacts, charging rates, and field resistances in relation to a vibrator control system. | 11th Jun 1932 | Box 163 \ 6 img171 | |
| Charging scheme to resolve the issue of burning side lamp bulbs on a 20/25 HP model. | 16th Jun 1932 | Box 163 \ 6 img172 | |
| Proposal for a three-charge dynamo scheme on the 20/25HP model, including suggestions for re-engraving the switch case. | 16th Jun 1932 | Box 163 \ 6 img173 | |
| Dynamo tests for a 3-charge scheme when fitting a 40/50 dynamo to a 20/25 HP chassis. | 22th Jun 1932 | Box 163 \ 6 img174 | |
| Dynamo figures and charging systems for the 20/25 HP chassis. | 22th Jun 1932 | Box 163 \ 6 img175 | |
| The fitting of a 40/50 dynamo to a 20/25 HP chassis with a three-charge scheme. | 24th Jun 1932 | Box 163 \ 6 img176 | |
| Battery charging issues on the 20/25 HP model and proposed solutions, including fitting a larger dynamo and modifying the switchbox. | 29th Jun 1932 | Box 163 \ 6 img177 | |
| Proposal to replace ammeters with volt-meters on instrument panels to better indicate battery condition to the driver. | 30th Jun 1932 | Box 163 \ 6 img178 | |
| Lack of improvement in the half-charge dynamo scheme for the 20/25 HP model. | 30th Jun 1932 | Box 163 \ 6 img179 | |
| Summary of investigations into the cutting-in speed and charging issues of the Half-Charge Dynamo Scheme for the 20/25 HP model. | 25th Apr 1932 | Box 163 \ 6 img180 | |
| Summary of internal communications regarding modifications and testing of dynamos and armatures. | 28th Apr 1932 | Box 163 \ 6 img181 | |
| Dynamo charge rates for the 20/25 HP chassis, referencing blueprints for fitting a 40/50 dynamo. | 30th Jun 1932 | Box 163 \ 6 img182 | |
| Performance and standardization of an experimental dynamo for the 20/25 HP model. | 4th Jul 1932 | Box 163 \ 6 img183 | |
| Proposing to raise the question of dynamo charge and its method of control. | 4th Jul 1932 | Box 163 \ 6 img184 | |
| Potential modifications to the battery charging system on the 20/25 HP chassis. | 4th Jul 1932 | Box 163 \ 6 img185 | |
| Successful test of an experimental armature for a 20/25 HP dynamo and future development. | 5th Jul 1932 | Box 163 \ 6 img186 | |
| Proposed modifications to improve the performance of an experimental 20/25HP dynamo. | 5th Jul 1932 | Box 163 \ 6 img187 | |
| Proposed modifications for a 20/25 HP Dynamo, specifically regarding core length, control brushes, and armature diameter. | 7th Jul 1932 | Box 163 \ 6 img188 | |
| Re-arranging the 20/25 HP switchbox for 2-stage battery charging to utilize the improved dynamo output. | 8th Jul 1932 | Box 163 \ 6 img189 | |
| Results of tests on a new 20/25 dynamo, proposing different field resistances for summer and winter charging. | 8th Jul 1932 | Box 163 \ 6 img190 | |
| Comparison of fitting a 40/50 dynamo versus a new 20/25 machine with different battery charging schemes. | 8th Jul 1932 | Box 163 \ 6 img191 | |
| Insufficient dynamo output on the 20/25 Chassis and proposed solutions. | 21th Jul 1932 | Box 163 \ 6 img192 | |
| Proposed modifications to the switchbox and dynamo charging system. | 9th Jul 1932 | Box 163 \ 6 img193 | |
| Proposal for dynamo and switchbox configurations to meet battery demands for starting, ignition, and lighting. | 9th Jul 1932 | Box 163 \ 6 img194 | |
| Request to fit a new 20/25 dynamo, tested on the bench, to car 18.G.IV for a standardization road test. | 12th Jul 1932 | Box 163 \ 6 img195 | |
| Dynamo options and a vibrator control system for the 25HP model. | 14th Jul 1932 | Box 163 \ 6 img196 | |
| Introducing an improved dynamo for the 20/25 model, including timing and scrap costs. | 15th Jul 1932 | Box 163 \ 6 img197 | |
| Instruction to test an improved 20-HP Dynamo and its components for standardisation. | 16th Jul 1932 | Box 163 \ 6 img198 | |
| Request to issue a Standardisation Sheet for the 20/25 HP Chassis dynamo with short armature and three-charge switch. | 18th Jul 1932 | Box 163 \ 6 img199 | |
| Need for more comprehensive testing of a 25 HP Dynamo before its adoption. | 18th Jul 1932 | Box 163 \ 6 img200 | |
| Need for proper testing before standardising a 20/25 HP Dynamo. | 19th Jul 1932 | Box 163 \ 6 img201 | |
| Testing modified 20/25 HP dynamos on specific vehicles, including one for Malcolm Campbell. | 20th Jul 1932 | Box 163 \ 6 img202 | |
| Fitting a new 20/25 HP dynamo to Malcolm Campbell's car and ordering six further sets. | 22th Jul 1932 | Box 163 \ 6 img203 | |
| Request to fit a new 3 Charge Scheme to chassis 18.G.IV for the W. Series 20/25 production. | 30th Aug 1932 | Box 163 \ 6 img204 | |
| Internal memorandum asking about the availability of new 2D/25 HP dynamos. | 31th Aug 1932 | Box 163 \ 6 img205 | |
| Extract from minutes of a conference in Derby concerning experimental 20/25 dynamos. | 1st Sep 1932 | Box 163 \ 6 img206 | |
| Extract from conference minutes regarding the performance of a Vibrator Control Dynamo and the issuing of a standardisation sheet. | 1st Sep 1932 | Box 163 \ 6 img207 | |
| Instruction to fit a car with a three-rate charge scheme, requiring a change of dynamo. | 1st Sep 1932 | Box 163 \ 6 img208 | |
| New 3-charge dynamo system for the electrical equipment on car GLN-60. | 5th Sep 1932 | Box 163 \ 6 img209 | |
| Implementation of voltage regulator dynamos on the Peregrine chassis. | 22th Sep 1932 | Box 163 \ 6 img210 | |
| Fitting a C.A.V. regulator to conduct experiments to improve the R.R. regulator. | 22th Sep 1932 | Box 163 \ 6 img211 | |
| Allocation of four sets of new improved 20/25 dynamos and three-charge scheme units. | 24th Sep 1932 | Box 163 \ 6 img212 | |
| Fitting of new improved 20/25 HP dynamos and switch sets to four specific cars. | 30th Sep 1932 | Box 163 \ 6 img213 | |
| Availability of sets for the new improved 20/25 Dynamo and 3 Charge Scheme. | 3rd Oct 1932 | Box 163 \ 6 img214 | |
| New improved 20/25 dynamo and 3 charge scheme. | 3rd Oct 1932 | Box 163 \ 6 img215 | |
| The fitting of a special dynamo and switch arrangement to Sales Trials Car, chassis GAU-14. | 3rd Oct 1932 | Box 163 \ 6 img216 | |
| Query requesting a detailed explanation on the functionality of the three-charge switch scheme. | 11th Oct 1932 | Box 163 \ 6 img217 | |
| Query regarding the 20/25 HP three-charge electrical scheme, requesting a wiring diagram and clarification on vibrator control issues. | 13th Oct 1932 | Box 163 \ 6 img218 | |
| Proposal for a 20/25 three-charge scheme for a dynamo, outlining its improvements and disadvantages. | 18th Oct 1932 | Box 163 \ 6 img219 | |
| Notes on the proposed three-charge electrical scheme for the 20/25 model. | 17th Oct 1932 | Box 163 \ 6 img220 | |
| Trial allocation of a new three-charge scheme for 25 HP cars. | 17th Oct 1932 | Box 163 \ 6 img221 | |
| Inherent bad features of the third brush dynamo in a three-charge scheme for the 20/25 HP model. | 17th Oct 1932 | Box 163 \ 6 img222 | |
| New three-charge electrical scheme for 20/25 HP cars, including fitting schedules and potential issues. | 18th Oct 1932 | Box 163 \ 6 img223 | |
| Procedure for rapidly charging a battery using the full output of the dynamo. | 18th Oct 1932 | Box 163 \ 6 img224 | |
| The 20/25 Three Charge Scheme, the preparation of sets for fitting, and a warning about dynamo overheating. | 18th Oct 1932 | Box 163 \ 6 img225 | |
| Abnormal ignition connections and three-charge scheme on trials car GAU-14. | 19th Oct 1932 | Box 163 \ 6 img226 | |
| Testing and implementation of a three-charge scheme for the French Trials Car, chassis GHW-76. | 22th Oct 1932 | Box 163 \ 6 img227 | |
| Confirming a fault with the ignition switch on chassis GAU-14 relating to the three charge scheme. | 24th Oct 1932 | Box 163 \ 6 img228 | |
| Accompanying blueprints for the 'Peregrine II' wiring and fittings alteration. | 1st Nov 1932 | Box 163 \ 6 img229 | |
| Production and despatch of a correct switchbox for Chassis GAU-14. | 5th Nov 1932 | Box 163 \ 6 img230 | |
| Adjusting the control brush angle on a 20/25 dynamo for safe operation without field resistance. | 5th Nov 1932 | Box 163 \ 6 img231 | |
| Parts request for switchboxes for the 20/25 HP and 'Peregrine II' models, detailing a revised switching scheme. | 8th Nov 1932 | Box 163 \ 6 img232 | |
| Response to a fault regarding the dynamo output on a Peregrine chassis, with suggestions for testing. | 8th Nov 1932 | Box 163 \ 6 img233 | |
| Issues with the dynamo's charging rate on a Peregrine chassis. | 10th Nov 1932 | Box 163 \ 6 img234 | |
| Arrangement for a car's switchbox replacement in London. | 14th Nov 1932 | Box 163 \ 6 img235 | |
| Transfer of an experimental 'Three Charge Scheme' to a new car chassis, GHW-78. | 15th Nov 1932 | Box 163 \ 6 img236 | |
| Replacement of a faulty switchbox for car GAU-14. | 15th Nov 1932 | Box 163 \ 6 img237 | |
| Exchanging a switch-box on chassis GAU.14, contingent on the return of the old unit, and attaching a wiring diagram. | 16th Nov 1932 | Box 163 \ 6 img238 | |
| The fitting of an experimental three-charge dynamo to trials car chassis GHW-78. | 16th Nov 1932 | Box 163 \ 6 img239 | |
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