| Description | Date | Identifier | |
| Three non-standard Watford Magnetos, requesting they be sent for inspection to identify modifications. | 22th May 1928 | Box 65 \ 3 scan0286 | |
| The loan of three specific magnetos to the Experimental Fighting Cocks (EFC) department for reporting purposes. | 23th May 1928 | Box 65 \ 3 scan0287 | |
| The inspection of three Watford magnetos and sending them to the Test Department. | 24th May 1928 | Box 65 \ 3 scan0288 | |
| Request to implement an improved one-piece cam for the E.W.6 magneto into production. | 25th May 1928 | Box 65 \ 3 scan0289 | |
| Replacement of a Watford EW6 magneto on engine 12-EX due to cold start issues. | 31th May 1928 | Box 65 \ 3 scan0290 | |
| The return of three Watford EW6 magnetos. | 4th Jun 1928 | Box 65 \ 3 scan0291 | |
| Examination report on a noisy Watford EW6 magneto which was found to have worn contact breaker platinum points. | 20th May 1928 | Box 65 \ 3 scan0292 | |
| Report comparing the performance of Lucas and Watford magnetos on 40/50 HP Phantom chassis. | 16th Jun 1928 | Box 65 \ 3 scan0293 | |
| Continued note comparing the noise levels of Lucas, E.W.6, and E.O.6 magnetos. | 18th Jun 1928 | Box 65 \ 3 scan0294 | |
| Correction to a report on the performance of a Watford magneto fitted to a 40/50 HP car, model 14-EX. | 18th Jun 1928 | Box 65 \ 3 scan0295 | |
| The despatch of three Watford EW6 magnetos for repair and updating. | 18th Jun 1928 | Box 65 \ 3 scan0296 | |
| Comparing the performance of Watford and Lucas magnetos for cars and Thomson-Houston for aero engines. | 21th Jun 1928 | Box 65 \ 3 scan0297 | |
| Noise levels of Watford Magnetos (Type EW.6) fitted with new continuous cam rings. | 25th Jun 1928 | Box 65 \ 3 scan0298 | |
| From EFC to Hs/AJL regarding the replacement of magneto No. 100080 with No. 100097. | 4th Jul 1928 | Box 65 \ 3 scan0299 | |
| Dispatch of an experimental magneto for modification. | 5th Jul 1928 | Box 65 \ 3 scan0300 | |
| Letter from North & Sons, Ltd. to Rolls-Royce Ltd. regarding an E.W.6 armature. | 1st Aug 1928 | Box 65 \ 3 scan0301 | |
| Instruction to the Works to accept five overhauled Watford E.W.6 magnetos suitable for production. | 13th Aug 1928 | Box 65 \ 3 scan0302 | |
| Electrical experimental record sheet for a Watford EWG magneto, tracking testing and modifications. | 12th May 1928 | Box 65 \ 3 scan0303 | |
| Electrical experimental record sheet for a Watford EW6 Magneto, No 100094. | 31th Mar 1928 | Box 65 \ 3 scan0304 | |
| Electrical experimental record sheet for a Watford EWG magneto, serial number Na100081. | 23th May 1928 | Box 65 \ 3 scan0305 | |
| Electrical experimental record sheet for a Watford EWG magneto, serial number 100080. | 5th Jul 1928 | Box 65 \ 3 scan0306 | |
| Comparative analysis of a Bosch FU6R magneto with a Watford EW6 magneto. | 22th Aug 1928 | Box 65 \ 3 scan0307 | |
| Comparison of Bosch and Watford armatures, including windings, insulation, and magnet pole piece design with a sketch. | 22th Aug 1928 | Box 65 \ 3 scan0308 | |
| Continued report page discussing the design of Watford EW6 magneto pole pieces and comparing them to Bosch. | 20th Aug 1928 | Box 65 \ 3 scan0309 | |
| Comparison of the electrical properties and core sections of Bosch FU6R and Watford EG6 magneto armatures. | 20th Aug 1928 | Box 65 \ 3 scan0310 | |
| Comparison of Bosch and Watford armature windings, including diagrams and analysis of materials and construction. | 22th Aug 1928 | Box 65 \ 3 scan0311 | |
| Letter to Messrs. North & Sons regarding a comparison report on Bosch and Watford magneto armatures. | 22th Aug 1928 | Box 65 \ 3 scan0312 | |
| Instruction sheet detailing the test results of a Watford EW6 magneto, noting incorrect rotor markings and a minor brush squeak. | 7th Sep 1928 | Box 65 \ 3 scan0313 | |
| Letter to Messrs. North & Sons Ltd. regarding incorrect rotation markings on a Watford magneto distributor rotor. | 8th Sep 1928 | Box 65 \ 3 scan0314 | |
| Replacement Watford EW7 magneto, noting its incorrect rotor timing marks for an S.S. engine. | 8th Sep 1928 | Box 65 \ 3 scan0315 | |
| Letter from North & Sons Ltd. regarding the re-engraving of a magneto arm or the supply of a new one. | 15th Sep 1928 | Box 65 \ 3 scan0316 | |
| Confirming approval to re-mark a Watford EW6 Magneto to suit engine timing. | 17th Sep 1928 | Box 65 \ 3 scan0317 | |
| Noisy Watford EW6 magneto being returned for correction. | 11th Oct 1928 | Box 65 \ 3 scan0318 | |
| Query to Messrs. North & Sons Ltd. about experiments with various brush grades to minimise squeaks on EW6 magnetos. | 20th Sep 1928 | Box 65 \ 3 scan0319 | |
| Burnt-out contact breaker from an EW5 magneto after low mileage. | 11th Oct 1928 | Box 65 \ 3 scan0320 | |
| Extract of a letter to Messrs. North & Sons Ltd. regarding a report on a Lucas type ER6 magneto with tungsten points. | 23th Oct 1928 | Box 65 \ 3 scan0321 | |
| Letter from North & Sons, Ltd. regarding H.T. Brush squeaks in an E.W.6 Magneto. | 23th Oct 1928 | Box 65 \ 3 scan0322 | |
| Reply received about EW6 magneto H.T. brush squeaks. | 24th Oct 1928 | Box 65 \ 3 scan0323 | |
| Disagreeing with Messrs Norths' assessment on when brush squeaks occur in EW.6 magnetos. | 30th Oct 1928 | Box 65 \ 3 scan0324 | |
| Letter to North & Sons Ltd. disputing the cause of H.T. brush squeaks on EW6 magnetos. | 2nd Nov 1928 | Box 65 \ 3 scan0325 | |
| Letter from North & Sons Ltd. regarding a damaged magneto contact breaker due to petrol vapour. | 5th Nov 1928 | Box 65 \ 3 scan0326 | |
| Letter from North & Sons, Ltd. acknowledging a report of squeaking H.T. brushes in E.W.6 magnetos. | 5th Nov 1928 | Box 65 \ 3 scan0327 | |
| Letter regarding the failure of a Contact Breaker from a Magneto, with an enclosed report from the makers. | 6th Nov 1928 | Box 65 \ 3 scan0328 | |
| Letter concerning a failed Watford EW6 magneto on chassis 10-EX due to potential petrol vapour ingress. | 7th Nov 1928 | Box 65 \ 3 scan0329 | |
| Correspondence regarding a squeaking H.T. brush on an EW6 Magneto. | 7th Nov 1928 | Box 65 \ 3 scan0330 | |
| Potential cause of a magneto failure due to engine cleaning methods. | 7th Nov 1928 | Box 65 \ 3 scan0331 | |
| Letter to Messrs. North & Sons Ltd. regarding a damaged contact breaker, confirming the cause and arranging repair. | 8th Nov 1928 | Box 65 \ 3 scan0332 | |
| Repair order for a damaged EW6 contact breaker. | 8th Nov 1928 | Box 65 \ 3 scan0333 | |
| Faulty EW.6 Magneto (No. 113996) that is knocking and has squeaky H.T. brushes. | 9th Nov 1928 | Box 65 \ 3 scan0334 | |
| Production inspection and test specification for a Watford EW6 Magneto for an S.S. Chassis. | 21th Dec 1928 | Box 65 \ 3 scan0335 | |
| Inspection procedure for the Watford Type ZRS Magneto for the P.H. 40/50 HP S.S. Chassis. | 21th Dec 1928 | Box 65 \ 3 scan0336 | |
| Page two of a document detailing test procedures for a magneto and its associated components. | 21th Dec 1928 | Box 65 \ 3 scan0337 | |
| Testing procedures and performance specifications for a magneto, detailing running observations and minimum sparking speeds. | 28th Dec 1928 | Box 65 \ 3 scan0338 | |
| The examination of magneto points after 6242 miles, noting wear and cleaning of the distributor. | 28th Dec 1928 | Box 65 \ 3 scan0339 | |
| Repeated failure of a Watford EW6 magneto and a request to return it to the manufacturer. | 29th Jan 1929 | Box 65 \ 3 scan0340 | |
| Misfiring issue and worn contact points concerning a Watford EW6 Magneto from experimental chassis 10-EX. | 29th Jan 1929 | Box 65 \ 3 scan0341 | |
| Instruction regarding the failure and replacement of Watford EW6 magnetos due to worn contact points. | 8th Feb 1929 | Box 65 \ 3 scan0342 | |
| Inquiring about premature failure of Watford EW6 magneto contact breaker points. | 9th Feb 1929 | Box 65 \ 3 scan0343 | |
| Premature failure of Watford EW6 magneto contact breaker points due to an incorrect spring design. | 9th Feb 1929 | Box 65 \ 3 scan0344 | |
| Inquiry regarding evidence of premature failure of Watford EW6 magneto contact breaker points. | 1st Feb 1929 | Box 65 \ 3 scan0345 | |
| Correspondence regarding a returned Contact Breaker from a Watford EW6 type Magneto and the subsequent report from Messrs. North. | 25th Feb 1929 | Box 65 \ 3 scan0346 | |
| Letter from North & Sons Ltd. regarding damage to magneto contact breaker points caused by petrol vapour combustion. | 21th Feb 1929 | Box 65 \ 3 scan0347 | |
| Examination report on a complaint regarding a Watford EW6 type Magneto, No. 100081. | 22th Feb 1929 | Box 65 \ 3 scan0348 | |
| Cause of combustion evidence in a Watford EW6 Magneto. | 25th Feb 1929 | Box 65 \ 3 scan0349 | |
| Instruction regarding a noisy Watford magneto returned from experimental chassis 10EX after 1000 miles. | 23th Mar 1929 | Box 65 \ 3 scan0350 | |
| Premature failure and chemical analysis of a Watford EW6 magneto contact breaker. | 25th Mar 1929 | Box 65 \ 3 scan0351 | |
| Faulty Watford EW6 magneto returned due to noisy and knocking distributor gears. | 26th Mar 1929 | Box 65 \ 3 scan0352 | |
| Letter from North & Sons, Ltd. about an alteration to the electrical performance of E.W.6 Magnetos. | 12th Apr 1929 | Box 65 \ 3 scan0353 | |
| Communication regarding a quote from North & Sons Ltd. for the repair of Magneto No. 99802. | 16th Apr 1929 | Box 65 \ 3 scan0354 | |
| Test results log for E.W.6 magnetos, comparing performance across nine different armatures. | 16th Apr 1929 | Box 65 \ 3 scan0355 | |
| Specification table for various core sections and windings. | 16th Apr 1929 | Box 65 \ 3 scan0356 | |
| Test results table for E.W.6 Magneto with different numbered armatures. | 16th Apr 1929 | Box 65 \ 3 scan0357 | |
| Meeting to discuss the development and issues with Watford EW6 magnetos. | 16th Apr 1929 | Box 65 \ 3 scan0358 | |
| The ineffectiveness of ventilation in reducing noise or preventing the burning of contact breaker points. | 18th Apr 1929 | Box 65 \ 3 scan0359 | |
| Complaint about a noisy Watford EW6 Magneto with knocking gears after 1000 miles, requesting replacement parts free of charge. | 18th Apr 1929 | Box 65 \ 3 scan0360 | |
| Proposal to order improved and ventilated magnetos from Messrs. North & Sons for the 40/50 HP and 20 HP chassis. | 8th Apr 1929 | Box 65 \ 3 scan0361 | |
| Instruction sheet regarding a faulty Watford EW6 magneto removed from an S.S. engine due to a developing knock. | 29th Apr 1929 | Box 65 \ 3 scan0362 | |
| Letter regarding the cost of repairs and modifications to Magneto No. 99802. | 29th Apr 1929 | Box 65 \ 3 scan0363 | |
| Return of a faulty Watford EW6 magneto due to fouling of the armature. | 29th Apr 1929 | Box 65 \ 3 scan0364 | |
| Authorising an order for work on an EW6 Watford Magneto. | 30th Apr 1929 | Box 65 \ 3 scan0365 | |
| Note on the material used for gears in the Watford EW6 magneto. | 30th Apr 1929 | Box 65 \ 3 scan0366 | |
| Letter to Messrs. R.B. North & Sons requesting an update on modifying an RW6 magneto for trial on experimental cars. | 14th May 1929 | Box 65 \ 3 scan0367 | |
| Inquiry regarding the delivery of Watford EW6A magnetos and the development status of a 20 HP sleeveless type magneto. | 14th May 1929 | Box 65 \ 3 scan0368 | |
| Requesting an alteration to the lower speed sparking figures for Watford EW6 magnetos. | 17th May 1929 | Box 65 \ 3 scan0369 | |
| Receipt and distribution of chassis magnetos and related parts from North & Sons. | 29th May 1929 | Box 65 \ 3 scan0370 | |
| Failed contact breaker from a Watford EW6 magneto on experimental chassis 12-EX. | 10th Jun 1929 | Box 65 \ 3 scan0371 | |
| The testing and approval of B.W.6 magneto contact covers. | 11th Jun 1929 | Box 65 \ 3 scan0372 | |
| Rapid wear of platinum contact breaker points in Watford E.W.6 magnetos and suggesting design improvements. | 3rd Jun 1929 | Box 65 \ 3 scan0373 | |
| Investigation into the unsatisfactory performance and rapid burning of platinum points on the Watford E.W.6 magneto. | 4th Jun 1929 | Box 65 \ 3 scan0374 | |
| Testing Lucas magnetos with tungsten points. | 4th Jun 1929 | Box 65 \ 3 scan0375 | |
| Examination and repair of a Watford E.W.6 magneto. | 4th Jun 1929 | Box 65 \ 3 scan0376 | |
| The repair of Magneto No. 114788, which has a knocking noise in the gears. | 19th Jun 1929 | Box 65 \ 3 scan0377 | |
| The rectification and return of a Magneto contact breaker and feedback on new ventilated covers. | 24th Jun 1929 | Box 65 \ 3 scan0378 | |
| Letter from North & Sons, Ltd. regarding the delivery schedule for 3 model R.O.1 magnetos. | 28th Jun 1929 | Box 65 \ 3 scan0379 | |
| Request to obtain two new contact breaker levers and screws with platinum contacts for Watford EW6 magnetos. | 7th Jul 1929 | Box 65 \ 3 scan0380 | |
| Letter from North & Sons Limited regarding damaged contact breaker points due to petrol vapour combustion. | 3rd Jul 1929 | Box 65 \ 3 scan0381 | |
| Contact Breaker removed from an E.W.6 Magneto on Experimental Chassis 14-EX. | 4th Jul 1929 | Box 65 \ 3 scan0382 | |
| Test results for a Watford EW.6 Magneto, showing short circuit current at various speeds. | 19th Jul 1929 | Box 65 \ 3 scan0383 | |
| Comparing the features of Watford EW6A magnetos against the standard EW6 type. | 20th Jul 1929 | Box 65 \ 3 scan0384 | |
| The testing and performance of EW6 magnetos for experimental chassis. | 20th Jul 1929 | Box 65 \ 3 scan0385 | |
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