| Description | Date | Identifier | |
| Series of calculations comparing present and new dimensions for a component's slot and neck. | 4th May 1928 | Box 68 \ 4 scan0266 | |
| Calculations for redesigning a 28 slot armature for a 40/50 case, including coil turns and wire dimensions. | 9th May 1928 | Box 68 \ 4 scan0267 | |
| Request to create a higher output dynamo armature for a 20 HP chassis by using thicker wire. | 9th May 1928 | Box 68 \ 4 scan0268 | |
| Customer demand for higher output dynamos and solutions for high-speed overcharging. | 23th Jun 1928 | Box 68 \ 4 scan0269 | |
| Instructions and test results for a 20hp Dynamo M with modified armature coils. | 10th Jul 1928 | Box 68 \ 4 scan0270 | |
| Instructions on the performance of a machine and its fitting to a 20 HP 'India' chassis. | 11th Jul 1928 | Box 68 \ 4 scan0271 | |
| Experimental test report on a 20 HP dynamo modified with a coarser gauge armature to achieve higher output. | 11th Jul 1928 | Box 68 \ 4 scan0272 | |
| The temperature and performance testing of a commutator and brushes, noting satisfactory operation and the planned receipt of a Phantom dynamo armature. | 14th Jul 1928 | Box 68 \ 4 scan0273 | |
| The testing and proposed production of higher output armatures for 20 HP and 40/50 HP dynamos. | 14th Jul 1928 | Box 68 \ 4 scan0274 | |
| Attaching a blueprint showing the output curve for a 20 HP dynamo modified with a coarser gauge armature. | 16th Jul 1928 | Box 68 \ 4 scan0275 | |
| Fitting and performance of a 20 HP dynamo with a higher output armature on an 'India' chassis. | 25th Jul 1928 | Box 68 \ 4 scan0277 | |
| Accompanying a preliminary production specification and test for a 20 HP Dynamo with a higher output armature. | 15th Nov 1928 | Box 68 \ 4 scan0278 | |
| Specification for the inspection and test of a 20 HP Dynamo with a higher output armature. | 15th Nov 1928 | Box 68 \ 4 scan0279 | |
| Test and bedding procedure for dynamo brushes. | 15th Nov 1928 | Box 68 \ 4 scan0280 | |
| Page 3 of a continued document outlining testing procedures for a dynamo. | 30th Jan 1929 | Box 68 \ 4 scan0281 | |
| Dynamo charging current issues and potential improvements. | 30th Jan 1929 | Box 68 \ 4 scan0282 | |
| Performance of higher output dynamos and the risk of premature battery deterioration. | 1st Feb 1929 | Box 68 \ 4 scan0283 | |
| Battery overcharging, dynamo output curves, and the potential use of a green lamp charge indicator. | 1st Feb 1929 | Box 68 \ 4 scan0284 | |
| Experiments with higher output dynamos and green lamp schemes on various chassis. | 8th Feb 1929 | Box 68 \ 4 scan0285 | |
| Dynamo output optimization and weight reduction for the 'SS' chassis. | 8th Feb 1929 | Box 68 \ 4 scan0286 | |
| Dynamo output and recommendations for an intermediate armature. | 2nd Feb 1929 | Box 68 \ 4 scan0287 | |
| Comparing different armature slot configurations to reduce noise for Phantom and 20 HP models. | 21th Feb 1929 | Box 68 \ 4 scan0288 | |
| Recommendation to experimentally build a 24-slot Phantom armature, detailing its specifications and comparing it to previous designs. | 21th Feb 1929 | Box 68 \ 4 scan0289 | |
| Specifications for an armature, detailing slots, coils, conductors, pitch, and angles. | 1st May 1929 | Box 68 \ 4 scan0290 | |
| The production and testing status of higher output dynamos for 40/50 HP and 20 HP models. | 4th Jul 1929 | Box 68 \ 4 scan0291 | |
| The testing and development of higher and intermediate output dynamos for 40/50 HP and 20 HP chassis. | 1st Jul 1929 | Box 68 \ 4 scan0292 | |
| The development of new standard armatures for two chassis types, including their specifications and testing plans. | 6th Jul 1929 | Box 68 \ 4 scan0293 | |
| The production and supply of higher output dynamos for the 20 HP and SS car chassis. | 6th Jul 1929 | Box 68 \ 4 scan0294 | |
| Record of a 20 HP higher output dynamo being received by the Experimental Department for testing. | 12th Jul 1929 | Box 68 \ 4 scan0295 | |
| Dynamo output and battery charging for the 20 HP and Phantom II models. | 28th Nov 1929 | Box 68 \ 4 scan0296 | |
| The development of Intermediate Output dynamos with dual major and minor output settings. | 28th Nov 1929 | Box 68 \ 4 scan0297 | |
| Dynamo output tests for the 20 HP model, comparing it to the Phantom case. | 28th Nov 1929 | Box 68 \ 4 scan0298 | |
| Instruction sheet detailing further tests on a 20hp Dynamo N with a 48 coil armature and trailing poles. | 7th Feb 1930 | Box 68 \ 4 scan0299 | |
| Test results on machine performance, comparing amperage, RPM, and sparking at different positions. | 8th Dec 1924 | Box 68 \ 4 scan0300 | |
| Graph of performance curves for a 20 HP dynamo, showing ampere and voltage output against RPM. | 1st Jul 1928 | Box 68 \ 4 scan0301 | |
| Increasing dynamo output for the Phantom and 20 HP models by modifying armature windings. | 1st Feb 1930 | Box 68 \ 4 scan0302 | |
| Development and advantages of a 48 coil armature machine over standard and higher output types. | 1st Feb 1930 | Box 68 \ 4 scan0303 | |
| Provision and testing of higher output dynamos and armatures for various chassis models. | 1st Feb 1930 | Box 68 \ 4 scan0304 | |
| Instruction to remove a higher output 20 HP dynamo from a test bed for use on chassis 12-G4. | 2nd Mar 1930 | Box 68 \ 4 scan0305 | |
| Preliminary test report on a 20 hp H-O Dynamo with field resistance. | 12th Feb 1930 | Box 68 \ 4 scan0306 | |
| Test results and analysis for field resistance and peak machine output, including a data table. | 8th Dec 1924 | Box 68 \ 4 scan0307 | |
| Insufficient dynamo output on 20/25 HP cars in the U.S.A. and a proposed modification. | 16th Jan 1931 | Box 68 \ 4 scan0308 | |
| Agreeing to a recommendation concerning the dynamo output for the 20/25 HP model. | 19th Jan 1931 | Box 68 \ 4 scan0309 | |
| Modifications to the 20/25 dynamo output for U.S.A. cars. | 20th Jan 1931 | Box 68 \ 4 scan0310 | |
| The modification of a 20/25 dynamo for U.S.A. cars. | 20th Jan 1931 | Box 68 \ 4 scan0311 | |
| Output curves and temperature rise settings for 20/25, 56, and 48 coil dynamos. | 26th Jan 1931 | Box 68 \ 4 scan0312 | |
| Continued report detailing performance curves for different dynamo modifications. | 26th Jan 1931 | Box 68 \ 4 scan0313 | |
| Continuation page of a report on the operation of the Lucas dynamo. | 26th Jan 1931 | Box 68 \ 4 scan0314 | |
| Output speed performance curves for three different 20/25 dynamos. | 16th Jan 1931 | Box 68 \ 4 scan0315 | |
| Dynamo output of 56 coil 20/25 dynamos with both unmodified and modified poles. | 26th Jan 1931 | Box 68 \ 4 scan0316 | |
| Proposal to standardize a higher dynamo output for the 20/25 HP chassis for the U.S.A. market and 'T' series models. | 26th Jan 1931 | Box 68 \ 4 scan0317 | |
| Blueprints for increasing the 20/25 Dynamo Output. | 26th Jan 1931 | Box 68 \ 4 scan0318 | |
| Letter to the American branch concerning modifications to increase the output of dynamos on 20/25 HP cars. | 30th Jan 1931 | Box 68 \ 4 scan0319 | |
| Letter detailing the conditions for comparing dynamo output curves before and after modification. | 30th Jan 1931 | Box 68 \ 4 scan0320 | |
| Graph showing the output speed performance curves for three different 20/25 dynamo configurations. | 15th Jan 1931 | Box 68 \ 4 scan0321 | |
| Dynamo output arrangement for the 20/25 HP Chassis, referencing the 40/50 and 'T' Series models. | 2nd Feb 1931 | Box 68 \ 4 scan0322 | |
| Proposed change to the half charge scheme for 25 HP dynamos. | 4th Feb 1931 | Box 68 \ 4 scan0323 | |
| The testing of a 20/25 dynamo with doubly tapered pole pieces, concluding there is no advantage. | 9th Feb 1931 | Box 68 \ 4 scan0324 | |
| Letter from the American branch to Derby regarding a 25HP generator, recommending a full replacement over repair. | 9th Feb 1931 | Box 68 \ 4 scan0325 | |
| Test report on a 20/25 HP 56 coil dynamo that overheated, causing the commutator solder to melt. | 10th Feb 1931 | Box 68 \ 4 scan0326 | |
| Specification sheet detailing the numerical particulars of an ignition coil system. | 24th Feb 1924 | Box 69 \ 1 scan0001 | |
| Specification sheet detailing the electrical characteristics of a ballast and primary coil system. | 14th Feb 1924 | Box 69 \ 1 scan0002 | |
| List of specifications and calculated values for a contact breaker, primary circuit, and core. | 14th Feb 1924 | Box 69 \ 1 scan0003 | |
| Specification sheet detailing the electrical characteristics of a condenser and transformer/coil system. | 14th Feb 1924 | Box 69 \ 1 scan0004 | |
| List of formulas related to primary, condenser, secondary, and contact breaker components. | 30th Apr 1924 | Box 69 \ 1 scan0005 | |
| Calculations for the rise of current in the primary circuit of a standard tall coil for battery ignition. | 30th Apr 1924 | Box 69 \ 1 scan0006 | |
| Calculation of the average and R.M.S. values of primary current. | 30th Apr 1924 | Box 69 \ 1 scan0007 | |
| Page of calculations for quantity, energy, current, and magnetic field efficiency. | 30th Apr 1924 | Box 69 \ 1 scan0008 | |
| Data table showing variations with speed of a contact breaker. | 16th May 1924 | Box 69 \ 1 scan0009 | |
| Table showing the effect of variation of make ratio (γ) for a standard battery ignition system. | 16th May 1924 | Box 69 \ 1 scan0010 | |
| Secret memorandum discussing modifications to the ignition coil's position, mounting, and materials. | 1st Oct 1924 | Box 69 \ 1 scan0011 | |
| Alternative scheme to insulate the ignition coil from engine heat, listing required parts. | 3rd Nov 1924 | Box 69 \ 1 scan0012 | |
| Production test procedure for EAC ignition coils. | 16th Jan 1925 | Box 69 \ 1 scan0013 | |
| Page 2 of a distributor testing procedure, detailing specific tests, running conditions, and current limits. | 24th Jan 1925 | Box 69 \ 1 scan0014 | |
| Suggestion to experimentally produce an EAC coil with a Redmanol case due to cracking issues with the Stabalite cases. | 24th Jan 1925 | Box 69 \ 1 scan0015 | |
| Requesting the experimental construction of three EAC coils in Redmanol cases. | 25th Feb 1925 | Box 69 \ 1 scan0016 | |
| Instructions for modifying the Ignition Coil X.8710 for the 20 HP & E.A.C. Chassis. | 2nd Mar 1925 | Box 69 \ 1 scan0017 | |
| Proposal to standardize the coil on the 'G' Series 20 HP by using a single EAC coil for manufacturing simplicity. | 12th Mar 1925 | Box 69 \ 1 scan0018 | |
| List of coils fitted to various chassis. | 1st Apr 1925 | Box 69 \ 1 scan0019 | |
| Instruction memo about the supply of three EAC Type Coils with material and component updates. | 4th May 1925 | Box 69 \ 1 scan0020 | |
| Experiments to improve ignition coils by reducing energy output and investigating a related patent. | 20th May 1925 | Box 69 \ 1 scan0021 | |
| Whether to experiment with a new design for a closed circuit, iron core ignition coil. | 20th May 1925 | Box 69 \ 1 scan0022 | |
| Test report confirming EAC type tall coils in Redmanol cases meet production specifications. | 8th Apr 1925 | Box 69 \ 1 scan0023 | |
| Fitting of three new EAC type coils in Redmanol cases to specific chassis. | 9th Jun 1925 | Box 69 \ 1 scan0024 | |
| Test results log for tall ignition coils, detailing performance metrics. | 17th Jun 1925 | Box 69 \ 1 scan0025 | |
| Query from Mr. Royce about the round EAC type coil for the 20 HP model. | 11th Sep 1925 | Box 69 \ 1 scan0026 | |
| The testing and manufacturing status of Redmanol encased battery ignition coils. | 23th Sep 1925 | Box 69 \ 1 scan0027 | |
| Comparative costs and quality of Redmanol and stabalite for coil cases. | 23th Sep 1925 | Box 69 \ 1 scan0028 | |
| Standardisation of a round base EAC type ignition coil for 20 HP chassis. | 15th Sep 1925 | Box 69 \ 1 scan0029 | |
| The mileage testing of Redmanol encased battery ignition coils. | 4th Mar 1926 | Box 69 \ 1 scan0030 | |
| Progress report on tests of tungsten contact points and coils with different windings. | 4th Mar 1926 | Box 69 \ 1 scan0031 | |
| High-tension test report comparing the dielectric strength of coil case materials: redmanol, stabalite, and mouldensite. | 7th Jun 1926 | Box 69 \ 1 scan0032 | |
| Supply and comparison of Redmanol and stabalite coil cases. | 21th Jul 1926 | Box 69 \ 1 scan0033 | |
| Changes to ignition components on chassis 89-GIII and requesting a report on chassis 10-EX. | 8th Sep 1926 | Box 69 \ 1 scan0034 | |
| Extract detailing tests of insulating materials for coil cases. | 16th Sep 1926 | Box 69 \ 1 scan0035 | |
| Test results comparing the electrical properties of seven Redmanol coil cases against one Stabalite case at varying temperatures. | 16th Sep 1926 | Box 69 \ 1 scan0036 | |
| Test results and general inferences from testing various coil cases under different temperature conditions. | 16th Sep 1926 | Box 69 \ 1 scan0037 | |
| Testing different grades of sheet material and faulty short type ignition coils. | 18th Sep 1926 | Box 69 \ 1 scan0038 | |
| Performance and potential destruction of platinum points in an ignition system. | 18th Sep 1926 | Box 69 \ 1 scan0039 | |
| The mileage test results for Redmanol encased ignition coils without failure. | 25th Sep 1926 | Box 69 \ 1 scan0040 | |
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