| Description | Date | Identifier | |
| Faulty H.T. collector from a Watford EO6 Magneto on an experimental car. | 20th Jul 1925 | Box 48 \ 2 Scan306 | |
| Request for magneto spare parts for experimental trials at the Chateauroux French base. | 21th Jul 1925 | Box 48 \ 2 Scan307 | |
| Complaint regarding a flopping noise in a Watford Magneto and a scheduled visit from North & Sons Ltd. to investigate. | 25th Aug 1925 | Box 48 \ 2 Scan308 | |
| Modifications to the New Phantom Magneto and reporting a peculiar ignition issue on a car. | 25th Aug 1925 | Box 48 \ 2 Scan309 | |
| Watford EC6 magnetos with modified sleeve location and larger air gap. | 26th Aug 1925 | Box 48 \ 2 Scan310 | |
| The investigation and rectification of noisy magnetos for the New Phantom chassis. | 31th Aug 1925 | Box 48 \ 2 Scan311 | |
| Magneto faults, specifically 'sleeve flopping', and proposed solutions following a meeting with the supplier, Messrs North & Sons. | 31th Aug 1925 | Box 48 \ 2 Scan312 | |
| Ongoing magneto faults from supplier Messrs Norths and recommendations for redesign for the New Phantom engine. | 31th Aug 1925 | Box 48 \ 2 Scan313 | |
| Modifications from a supplier to a sample magneto for a New Phantom chassis to address a noise issue. | 3rd Sep 1925 | Box 48 \ 2 Scan314 | |
| Improvements to the magnetos for the New Phantom chassis in comparison to the Silver Ghost. | 9th Mar 1925 | Box 48 \ 2 Scan315 | |
| Instructions regarding two faulty Watford E6bd magnetos needing reconditioning and modification. | 3rd Sep 1925 | Box 48 \ 2 Scan316 | |
| Letter from North & Sons Ltd. regarding modifications to a magneto to reduce noise. | 7th Sep 1925 | Box 48 \ 2 Scan317 | |
| Letter confirming the dispatch of a modified K.O.6 Magneto for a New Phantom Chassis. | 8th Sep 1925 | Box 48 \ 2 Scan318 | |
| Instruction note on the testing of a Watford E06 magneto, highlighting a high minimum sparking speed. | 9th Sep 1925 | Box 48 \ 2 Scan319 | |
| Supplier visit to North & Sons Ltd. regarding modifications and delivery of New Phantom chassis magnetos. | 15th Sep 1925 | Box 48 \ 2 Scan320 | |
| List of 60° range negative rotation magnetos present in the laboratory. | 16th Sep 1925 | Box 48 \ 2 Scan321 | |
| The poor performance of Watford EO6 magnetos and their return for reconditioning and modification. | 12th Oct 1925 | Box 48 \ 2 Scan322 | |
| Letter concerning the supply and modification of Watford EO.6 Magnetos with North & Sons Ltd. | 21th Oct 1925 | Box 48 \ 2 Scan323 | |
| Letter from a supplier regarding a misunderstanding over magneto modifications and quoting for remedial work. | 20th Oct 1925 | Box 48 \ 2 Scan324 | |
| Instruction to Messrs. Norths to proceed with making two Watford E06d magnetos. | 27th Oct 1925 | Box 48 \ 2 Scan325 | |
| The failure of a Watford magneto H.T. collector brush due to carbonization, with a recommendation to use stabalite. | 16th Nov 1925 | Box 48 \ 2 Scan326 | |
| Reply from North & Sons Ltd. regarding a faulty H.T. Pick-up on Watford Magnetos. | 25th Nov 1925 | Box 48 \ 2 Scan327 | |
| Damaged Watford magneto armature and suggestions for design improvement. | 26th Nov 1925 | Box 48 \ 2 Scan328 | |
| The materials and performance of B.T.H. and Watford magnetos, particularly concerning the H.T. collector. | 26th Nov 1925 | Box 48 \ 2 Scan329 | |
| Testing and return of a faulty Watford magneto for an EAC engine. | 26th Nov 1925 | Box 48 \ 2 Scan330 | |
| Quotation from North's for modifying two magnetos. | 7th Dec 1925 | Box 48 \ 2 Scan331 | |
| Letter from North and Sons Ltd. regarding the testing and quotation for the repair of magnetos. | 1st Dec 1925 | Box 48 \ 2 Scan332 | |
| Request to obtain half a dozen Watford magneto distributor brushes and springs for spares. | 8th Dec 1925 | Box 48 \ 2 Scan333 | |
| Change of plan for two Watford EC6 magnetos, which are now to be reconditioned instead of modified. | 9th Dec 1925 | Box 48 \ 2 Scan334 | |
| Production inspection and test log for a Watford Type E06 (d) Magneto. | 24th Nov 1925 | Box 48 \ 2 Scan335 | |
| Test report recording the design and performance details of a magneto. | 23th Nov 1925 | Box 48 \ 2 Scan336 | |
| Specifications for a sleeve magneto, detailing primary point gap and contact breaker timing angles. | 23th Nov 1925 | Box 48 \ 2 Scan337 | |
| Test results for endurance, short circuit, open circuit, and an open circuit primary volt-speed curve. | 23th Nov 1925 | Box 48 \ 2 Scan338 | |
| Test results for ampere-speed curve, utility tests, and sparking characteristics. | 23th Nov 1925 | Box 48 \ 2 Scan339 | |
| Test data sheet for sleeve magnetos, detailing secondary milliamps, primary point gap, and contact breaker timing. | 23th Nov 1925 | Box 48 \ 2 Scan340 | |
| Remarks on operational noise from components like gears, bearings, and magnetos, with suggestions for reduction. | 14th Dec 1925 | Box 48 \ 2 Scan341 | |
| Communication regarding a fault investigation on Watford Magneto No. 81100. | 14th Dec 1925 | Box 48 \ 2 Scan342 | |
| Watford Magnetos for EAC, discussing communications with North & Sons Ltd. regarding a returned armature. | 21th Dec 1925 | Box 48 \ 2 Scan343 | |
| Letter from North & Sons Ltd. discussing modifications and materials for a magneto, including slip rings, armature covers, and high-tension pick-ups. | 18th Dec 1925 | Box 48 \ 2 Scan344 | |
| Instructions for the re-assembly and testing of a Watford E6bd magneto with a new slip ring. | 21th Dec 1925 | Box 48 \ 2 Scan345 | |
| Disposition of several Watford magnetos no longer required by the Experimental Department. | 30th Dec 1925 | Box 48 \ 2 Scan346 | |
| Conversion of two Watford magnetos to the white base type. | 31th Dec 1925 | Box 48 \ 2 Scan347 | |
| Return of a Watford EO6d magneto contact breaker for repair. | 21th Jan 1926 | Box 48 \ 2 Scan348 | |
| Graph showing open circuit volt-speed and short circuit ampere-speed curves for B.T.H. and Watford magnetos. | 23th Nov 1925 | Box 48 \ 2 Scan349 | |
| Performance of Standard Watford magnetos, comparing flat cams with long cams. | 27th Jan 1926 | Box 48 \ 2 Scan350 | |
| Magneto sparking performance, comparing different models and the effect of long cams. | 27th Jan 1926 | Box 48 \ 2 Scan351 | |
| Magneto timing, comparing the make and break periods of different magneto types to optimise performance. | 27th Jan 1926 | Box 48 \ 2 Scan352 | |
| The use of long cams to reduce the noise of the contact breaker in magnetos. | 27th Jan 1926 | Box 48 \ 2 Scan353 | |
| Note discussing the wear and life of platinum points and the distribution of the document. | 27th Jan 1926 | Box 48 \ 2 Scan354 | |
| Request to obtain spare contact breaker screws with platinum points for a Watford EO6 magneto. | 30th Sep 1927 | Box 48 \ 2 Scan355 | |
| The testing of a Watford E.O.6 type Magneto No.99158, previously reported as faulty. | 5th Oct 1927 | Box 48 \ 2 Scan356 | |
| Transitioning to new Phantom magnetos from supplier Messrs. North & Sons. | 11th Nov 1927 | Box 48 \ 2 Scan357 | |
| Letter from North & Sons Ltd. concerning the production and supply of magnetos. | 10th Nov 1927 | Box 48 \ 2 Scan358 | |
| The production readiness of sleeveless Watford Magnetos from North & Sons and internal concerns about ongoing testing failures. | 12th Nov 1927 | Box 48 \ 2 Scan359 | |
| Requesting the return of two worn contact breaker levers from a Watford Chassis Magneto for repair. | 9th Dec 1927 | Box 48 \ 2 Scan360 | |
| Arranging the collection and despatch of EO6 Watford magnetos from the Experimental Department. | 13th Jan 1928 | Box 48 \ 2 Scan361 | |
| Confirming the transfer of four E.O.6 Watford magnetos and seeking disposal instructions for a fifth. | 24th Jan 1928 | Box 48 \ 2 Scan362 | |
| The modification and testing of Duralumin rocker arms for a Watford E.O.6 Magneto. | 25th Jan 1928 | Box 48 \ 2 Scan363 | |
| Requesting disposal instructions for a replaced E.O.6 Watford Magneto. | 1st Feb 1929 | Box 48 \ 2 Scan364 | |
| The poor quality and excessive noise of Watford E.O.6 Magnetos. | 4th Feb 1928 | Box 48 \ 2 Scan365 | |
| Correspondence regarding disposal instructions for an E.O.6 Watford Magneto that has been replaced. | 7th Feb 1928 | Box 48 \ 2 Scan366 | |
| Covering memo for an assistant's report on a special duralumin contact breaker lever for a Watford Magneto. | 28th Feb 1928 | Box 48 \ 2 Scan367 | |
| The high-speed endurance testing of special duralumin contact breaker levers for Watford magnetos. | 28th Feb 1928 | Box 48 \ 2 Scan368 | |
| Serious supply shortage of E0.6 magnetos for 40/50HP chassis. | 1st Mar 1928 | Box 48 \ 2 Scan369 | |
| The disposal of an E.O.6 Watford Magneto that has been replaced. | 5th Mar 1928 | Box 48 \ 2 Scan370 | |
| The disposal of an E.O.6. Watford Magneto. | 7th Mar 1928 | Box 48 \ 2 Scan371 | |
| Extract from a letter detailing the decision to switch to using bakelite pinions in magnetos to reduce noise. | 23th Mar 1928 | Box 48 \ 2 Scan372 | |
| The low-speed performance and cold-start issues of Watford EW6 and EC6 type magnetos. | 26th Mar 1928 | Box 48 \ 2 Scan373 | |
| Magneto performance issues at low speeds, comparing various types and proposing revisions to production specifications. | 28th Apr 1928 | Box 48 \ 2 Scan374 | |
| The suspected depreciation of magnetism in Watford magnetos. | 28th Apr 1928 | Box 48 \ 2 Scan375 | |
| The efficiency and depreciation of magnetism in Watford Magnetos, types E06 and R01. | 30th Apr 1928 | Box 48 \ 2 Scan376 | |
| Specifications for the windings and condenser of a Watford Magneto Armature. | 8th May 1928 | Box 48 \ 2 Scan377 | |
| List of alterations to a governor and magneto assembly for a 10,000-mile endurance test. | 8th May 1928 | Box 48 \ 2 Scan378 | |
| The performance of light governor weights versus stronger control springs due to oil viscosity. | 28th Apr 1926 | Box 48 \ 2 Scan379 | |
| Twelve-month warranty period for Watford magnetos from manufacturer North & Sons Ltd. | 28th Apr 1926 | Box 48 \ 2 Scan380 | |
| Inadequacy of the 12-month guarantee period for Watford Magnetos from supplier North & Son Ltd. | 28th Apr 1926 | Box 48 \ 2 Scan381 | |
| Guarantee terms, modifications, and quality concerns with supplier Messrs North & Sons. | 29th Apr 1926 | Box 48 \ 2 Scan382 | |
| Warranty disagreement with supplier Messrs. North & Sons for Watford magnetos. | 30th Apr 1926 | Box 48 \ 2 Scan383 | |
| Guarantee for Watford Magnetos and a misunderstanding with Messrs. North's. | 4th May 1926 | Box 48 \ 2 Scan384 | |
| Letter from North & Sons Ltd. clarifying their policy on replacing faulty magneto parts under an existing arrangement. | 3rd May 1926 | Box 48 \ 2 Scan385 | |
| Letter to Messrs. North & Sons Ltd. regarding a guarantee for magnetos. | 4th May 1926 | Box 48 \ 2 Scan386 | |
| Cause of noise in the Phantom Auto Advance magneto sleeve. | 4th May 1926 | Box 48 \ 2 Scan387 | |
| The merits of Lucas versus Watford magnetos for the Phantom model. | 14th May 1926 | Box 48 \ 2 Scan388 | |
| Comparing the Lucas ER6 magneto with the standard Watford magneto, proposing proceeding with tests. | 7th Jun 1926 | Box 48 \ 2 Scan389 | |
| Technical report discussing issues and potential improvements for Watford and Lucas magnetos. | 7th Jun 1926 | Box 48 \ 2 Scan390 | |
| Report outlining the advantages of using Lucas magnetos and considering alternatives. | 7th Jun 1926 | Box 48 \ 2 Scan391 | |
| Submission of two magnetos by Messrs. Lucas at their own expense. | 7th Jun 1926 | Box 48 \ 2 Scan392 | |
| Note discussing the testing of a Lucas magneto as a potential replacement for the underperforming standard Watford magneto. | 7th Jun 1926 | Box 48 \ 2 Scan393 | |
| Report page discussing magneto standardisation, requiring a guarantee of reliability from the Lucas Co. | 8th Jun 1926 | Box 48 \ 2 Scan394 | |
| Comparing Lucas and Watford magnetos, considering price, production methods, and brand reputation. | 8th Jun 1926 | Box 48 \ 2 Scan395 | |
| Magneto reliability, distinguishing between noise and failure, and the reputational risks of associating with Lucas magnetos. | 8th Jun 1925 | Box 48 \ 2 Scan396 | |
| Returning a document regarding the Lucas Magneto and the Present Standard Watford Magneto. | 10th Jun 1926 | Box 48 \ 2 Scan397 | |
| Faulty Watford EO.6 magnetos returned to North & Sons Ltd. for inspection and testing. | 10th Jun 1926 | Box 48 \ 2 Scan398 | |
| Letter from North & Sons Ltd. regarding the testing and repair of two returned magnetos. | 9th Jun 1926 | Box 48 \ 2 Scan399 | |
| Letter regarding an investigation into a complaint about stiff make-and-break cover mechanisms on Watford EO.6 magnetos. | 11th Jun 1926 | Box 48 \ 2 Scan400 | |
| Letter from North & Sons Ltd. regarding an investigation into the fitting of magneto sleeves when heated. | 10th Jun 1926 | Box 48 \ 2 Scan401 | |
| Confirming a meeting to discuss issues with Standard Watford Magnetos, including long cams and stiff make-and-break cover mechanisms. | 14th Jun 1926 | Box 48 \ 2 Scan402 | |
| Request to modify a Watford E06 Magneto to increase the sleeve's movement range for experimental testing. | 18th Jun 1926 | Box 48 \ 2 Scan403 | |
| Requesting a Watford EO6 magneto contact breaker cover be sent for modification and then returned to the laboratory. | 26th Jun 1926 | Box 48 \ 2 Scan404 | |
| The failure of Watford EO6 magneto pick-ups on experimental cars and a query regarding their material composition. | 28th Jun 1926 | Box 48 \ 2 Scan405 | |
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