| Description | Date | Identifier | |
| Desired modification of a Watford Magneto armature sleeve to alter its range of advance. | 1st Jul 1926 | Box 48 \ 2 Scan406 | |
| The return of one Watford magneto contact breaker for repair and the exchange of another. | 12th Jul 1926 | Box 48 \ 2 Scan407 | |
| Confirming the completion of modification to a Watford magneto, number 87418. | 1st Sep 1926 | Box 48 \ 2 Scan408 | |
| Preference for Watford magnetos over those from Lucas and Robert Bosch, citing technical superiority and reliability. | 2nd Nov 1926 | Box 48 \ 2 Scan409 | |
| And comparing different magneto designs from the Watford Company, with reference to Lucas designs. | 5th Nov 1926 | Box 48 \ 2 Scan410 | |
| Curve for the relay advance mechanism developed by the Experimental Department for the Phantom model. | 5th Nov 1926 | Box 48 \ 2 Scan411 | |
| Letter concerning discussions and experiments with North & Sons Ltd. on the Model EO.6 Watford Magneto. | 15th Nov 1926 | Box 48 \ 2 Scan412 | |
| Improving the performance of a Watford E06 magneto by modifying its cams. | 29th Mar 1926 | Box 48 \ 2 Scan413 | |
| The effects of variation in the platinum point gap. | 29th Mar 1926 | Box 48 \ 2 Scan414 | |
| Graph showing flux curves and voltage variation for a Watford E06 Magneto No. 85288. | 20th Mar 1926 | Box 48 \ 2 Scan415 | |
| Blank document page with a purple ink stamp from the Print Room in Derby. | 30th Mar 1926 | Box 48 \ 2 Scan416 | |
| Diagram of the timing for a Watford E06 Sleeve Magneto No 73972 and its distributor. | 23th Mar 1926 | Box 48 \ 2 Scan417 | |
| Blank document cover stamped by the Print Room in Derby. | 26th Mar 1926 | Box 48 \ 2 Scan418 | |
| Magneto spring, friction, and relay motor performance for the Phantom Auto Advance system. | 30th Mar 1936 | Box 48 \ 2 Scan419 | |
| Comparison table of Watford EO6 magneto distributor dimensions against suggested dimensions. | 31th Mar 1926 | Box 48 \ 2 Scan420 | |
| Requesting Mr. Lidsey to fit Watford magneto No. 89479 to 44-PK, replacing magneto No. 87407. | 13th Apr 1926 | Box 48 \ 2 Scan421 | |
| Correspondence with North & Sons Ltd about Standard Watford Magnetos. | 13th Apr 1926 | Box 48 \ 2 Scan422 | |
| Modifications and performance of the Phantom relay advance mechanism. | 18th Apr 1926 | Box 48 \ 2 Scan423 | |
| Experiments to improve the performance and reduce noise of a Phantom Ignition Governor Relay. | 23th Apr 1926 | Box 48 \ 2 Scan424 | |
| Piston design and ignition advance characteristics in engine relays. | 23th Apr 1926 | Box 48 \ 2 Scan425 | |
| Ignition advance governor design challenges, including a graph and tests on alternative piston materials. | 1st Feb 1926 | Box 48 \ 2 Scan426 | |
| Table detailing the relation of maximum flux through an armature to the sleeve position for a Watford Magneto Type E06d. | 1st Feb 1926 | Box 48 \ 2 Scan427 | |
| Letter received from North & Sons Ltd. about Standard Watford Magnetos. | 11th Feb 1926 | Box 48 \ 2 Scan428 | |
| Letter from North & Sons Ltd. discussing the technical difficulties of improving magneto efficiency and advance range. | 10th Feb 1926 | Box 48 \ 2 Scan429 | |
| Letter from North & Sons Ltd. discussing magneto output, range of advance and cam design. | 10th Feb 1926 | Box 48 \ 2 Scan430 | |
| Electrical timing and potential improvements to Standard Watford Magnetos, specifically regarding quietness. | 12th Feb 1926 | Box 48 \ 2 Scan431 | |
| Letter from North & Sons, Ltd. acknowledging correspondence and promising a follow-up discussion. | 1st Mar 1926 | Box 48 \ 2 Scan432 | |
| Experiments on the Phantom Automatic Ignition Advance system, specifically regarding the relay hydraulic motor's power margin. | 10th Mar 1926 | Box 48 \ 2 Scan433 | |
| Timing specifications for a Watford E06d Magneto No. 73972. | 11th Mar 1926 | Box 48 \ 2 Scan434 | |
| Distributor dimensions for a Watford E06d Magneto No. 73972. | 17th Mar 1926 | Box 48 \ 2 Scan435 | |
| Test data showing the relation of maximum flux through an armature to sleeve position for a Watford Magneto Type EO6d, No. 73972. | 1st Feb 1926 | Box 48 \ 2 Scan436 | |
| The friction within the Phantom automatic ignition advance mechanism and Watford magneto. | 13th Mar 1926 | Box 48 \ 2 Scan437 | |
| The causes of noise from the magneto sleeve and control linkages, and the challenges in eliminating it. | 13th Mar 1926 | Box 48 \ 2 Scan438 | |
| The performance, testing, and modification of a Lucas magneto. | 13th Mar 1926 | Box 48 \ 2 Scan439 | |
| Machine modifications for chassis tests and the supply status of Lucas magnetos. | 13th Mar 1936 | Box 48 \ 2 Scan440 | |
| From EFC to RHC regarding a suitable Watford Magneto for the 40/50 Chassis (X.8796). | 15th Mar 1926 | Box 48 \ 2 Scan441 | |
| New scheme for adjustable cams on the Watford Magneto for the 40/50 chassis. | 15th Mar 1926 | Box 48 \ 2 Scan442 | |
| Use of Watford magnetos and modifications to the Phantom Automatic Advance system. | 27th Mar 1926 | Box 48 \ 2 Scan443 | |
| Potential improvements to Standard Watford Magnetos regarding performance and noise. | 29th Mar 1926 | Box 48 \ 2 Scan444 | |
| Continued discussion on the timing and design of magnetos and distributors for a six-cylinder engine. | 29th Mar 1926 | Box 48 \ 2 Scan445 | |
| The timing of the magneto break, cams, and distributor. | 29th Mar 1926 | Box 48 \ 2 Scan446 | |
| The investigation of a failed Watford E06 Magneto. | 14th Sep 1927 | Box 48 \ 2 Scan447 | |
| Requesting instructions to return a contact breaker from a Watford E06 magneto to the makers for repair. | 30th Sep 1927 | Box 48 \ 2 Scan448 | |
| Delays in experiments with Watford EO6 magnetos and a suggestion for a new magneto design. | 16th Nov 1926 | Box 48 \ 2 Scan449 | |
| Instruction detailing a failure of the collector brush on Watford E06 magnetos due to oil leakage. | 18th Nov 1926 | Box 48 \ 2 Scan450 | |
| Instructions regarding a faulty, oversized carbon brush spring causing arcing on the slip ring. | 20th Aug 1920 | Box 48 \ 2 Scan451 | |
| Failure of a Watford EO6 magneto H.T. pick-up on an experimental car, with an attached report. | 19th Nov 1926 | Box 48 \ 2 Scan452 | |
| Faulty H.T. pick-up from a Watford E06 magneto, detailing the cause as a sticking collector brush. | 18th Nov 1926 | Box 48 \ 2 Scan453 | |
| Experimental parts received for a Watford EO6 magneto, aimed at noise reduction. | 26th Nov 1926 | Box 48 \ 2 Scan454 | |
| Communication detailing a reply from North & Sons regarding experiments on Watford E.O.6 magnetos. | 3rd Dec 1926 | Box 48 \ 2 Scan455 | |
| Performance of bone grey fibre used for rubbing blocks in battery ignition systems. | 12th Dec 1926 | Box 48 \ 2 Scan456 | |
| Requesting an experiment on a new H.T. pick-up with an Ebonite body for a Watford EO6 Magneto. | 15th Dec 1926 | Box 48 \ 2 Scan457 | |
| Conversation with Mr. North of the Watford Company regarding various magneto designs and automatic advance mechanisms. | 5th Nov 1926 | Box 48 \ 2 Scan458 | |
| Defective Watford Magneto high tension pick-up and its replacement ebonite part. | 29th Nov 1926 | Box 48 \ 2 Scan459 | |
| Proposed improvements for the Phantom and 20HP magnetos. | 10th Dec 1926 | Box 48 \ 2 Scan460 | |
| Follow-up letter requesting a report on an ebonite pick-up for a Watford Magneto. | 20th Dec 1926 | Box 48 \ 2 Scan461 | |
| The testing status of an ebonite pick-up for a Watford Magneto. | 21th Dec 1926 | Box 48 \ 2 Scan462 | |
| Request to order spare parts for Watford EO6 magnetos and to exchange a contact breaker. | 1st Jan 1927 | Box 48 \ 2 Scan463 | |
| Confidential memo discussing issues with magnetos for 40/50 and 20 HP models and considering alternative suppliers. | 27th Jan 1927 | Box 48 \ 2 Scan464 | |
| Life of magneto platinum points and comparing the performance of Watford and Lucas components. | 12th Feb 1927 | Box 48 \ 2 Scan465 | |
| Internal inquiry regarding the lifespan of Watford magneto contact points for the 40/50 chassis. | 12th Feb 1927 | Box 48 \ 2 Scan466 | |
| Responding to a query on electrical troubles, specifically with Magneto and Battery Ignition points on various car models. | 14th Feb 1927 | Box 48 \ 2 Scan467 | |
| The performance of trembler coil ignition, high tension distributor points, and dynamo brushes for 20HP models. | 14th Feb 1927 | Box 48 \ 2 Scan468 | |
| Comparison of the lifespan and performance of different magneto and battery ignition contact points. | 2nd Feb 1927 | Box 48 \ 2 Scan469 | |
| The unsatisfactory quietness of Watford EO.6 Magnetos and the testing of a replacement. | 18th Feb 1927 | Box 48 \ 2 Scan470 | |
| Modifications to a Watford E.O.6. Magneto by Messrs North, leading to a required endurance test and potential delays. | 21th Feb 1927 | Box 48 \ 2 Scan471 | |
| Noisy magnetos on the Phantom engine, hypothesizing the cause is wear from the unlubricated automatic advance mechanism. | 11th Mar 1927 | Box 48 \ 2 Scan472 | |
| Noise issues with the Watford Sleeve Magneto Type EO6 and potential solutions. | 14th Mar 1927 | Box 48 \ 2 Scan473 | |
| Request for spare parts for a Watford EO6 Magneto, including a replacement for a sheared component. | 26th Mar 1927 | Box 48 \ 2 Scan474 | |
| Modifying Watford magnetos for timing tests using special cams. | 28th Mar 1927 | Box 48 \ 2 Scan475 | |
| Modified H.T. pick-up for the Watford EO6 magneto to resolve issues with sticking carbon brushes. | 18th Jul 1927 | Box 48 \ 2 Scan476 | |
| Requesting the repair of two failed standard EO6 magneto contact breakers. | 18th Jul 1927 | Box 48 \ 2 Scan477 | |
| The investigation of a Watford Type E06 Magneto. | 5th Sep 1927 | Box 48 \ 2 Scan478 | |
| Testing of new 'Watford' magnetos as a potential cost-saving replacement for the standard model. | 6th Sep 1927 | Box 48 \ 2 Scan479 | |
| Investigation report on a Watford E06 magneto that failed to spark. | 12th Sep 1927 | Box 48 \ 2 Scan480 | |
| Instructions regarding a faulty magneto with a bad condenser or winding insulation, requesting an explanation from the supplier. | 29th Mar 1926 | Box 48 \ 2 Scan481 | |
| Technical report on the operation of Watford magnetos, discussing flux, armatures, and sleeve positioning for high-speed operation. | 29th Mar 1926 | Box 48 \ 2 Scan482 | |
| Continued analysis of magneto performance, comparing different designs and timing mechanisms. | 29th Mar 1926 | Box 48 \ 2 Scan483 | |
| Continued discussion on magneto and distributor performance, timing, and specifications. | 29th Mar 1926 | Box 48 \ 2 Scan484 | |
| Letter from Rolls-Royce of America concerning electrical installation, fuses, and cutouts for a chassis. | 28th Sep 1920 | Box 48 \ 3 Scan001 | |
| Inquiry regarding the Remy thermostatic control switch for generator output. | 15th Apr 1921 | Box 48 \ 3 Scan002 | |
| Technical letter explaining the operation and function of a thermostat unit for a generator. | 15th Apr 1921 | Box 48 \ 3 Scan003 | |
| Letter from the Remy Electric Company explaining the operation of a generator with a thermostat in hot weather. | 23th May 1921 | Box 48 \ 3 Scan004 | |
| Letter regarding sending a Remy thermostat unit for information as requested. | 23th May 1921 | Box 48 \ 3 Scan005 | |
| Letter discussing the functionality, application, and suitability of the Remy Thermostat Unit. | 4th Aug 1921 | Box 48 \ 3 Scan006 | |
| Request for a sample of thermostatic bimetal strip for experimental work. | 7th Oct 1929 | Box 48 \ 3 Scan007 | |
| Follow-up memo regarding the urgent matter of bimetal thermostatic control of dynamo output. | 1st Jan 1930 | Box 48 \ 3 Scan008 | |
| New combined fitting for the instrument board of future cars. | 31th Aug 1920 | Box 48 \ 3 Scan009 | |
| The inadequacy of Lucas fuses and Klaxon switches, and the development of new electrical components. | 22th Oct 1920 | Box 48 \ 3 Scan010 | |
| Arrangements for an experimental car with a saloon body being shipped to the U.S.A. for winter testing, including a list of new parts to be fitted. | 4th Nov 1920 | Box 48 \ 3 Scan011 | |
| The fitting of new parts to the 6.EX experimental car by coachbuilder Park Ward. | 13th Nov 1920 | Box 48 \ 3 Scan012 | |
| Query regarding potential wiring modifications, the introduction of a new switchbox, and the adoption of a Smith dynamo for the 'P' Series chassis. | 17th Nov 1920 | Box 48 \ 3 Scan013 | |
| Blueprints and design for a proposed Klaxon horn switch on Mr. Royce's car 6.EX. | 1st Dec 1920 | Box 48 \ 3 Scan014 | |
| List of experimental parts fitted to chassis 4.EX. | 12th Dec 1920 | Box 48 \ 3 Scan015 | |
| Design of an ignition switch and its integration with Lucas Dynamos and dual ignition systems. | 17th Mar 1921 | Box 48 \ 3 Scan016 | |
| The Klaxon switch and Dynamo/Cutout for 4 EX cars returned from America. | 17th Jun 1921 | Box 48 \ 3 Scan017 | |
| Cover note for a letter from Springfield regarding the fire danger of a steering column switch. | 20th Jul 1921 | Box 48 \ 3 Scan018 | |
| Letter concerning the fire danger of a steering column switch and suggestions for a solution. | 28th Jun 1921 | Box 48 \ 3 Scan019 | |
| Danger of fire related to the steering column switch. | 1st Aug 1921 | Box 48 \ 3 Scan020 | |
| Extract of comments from Mr. Platford regarding a Klaxon switch and a Lucas cut-out. | 13th Aug 1921 | Box 48 \ 3 Scan021 | |
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