| Description | Date | Identifier | |
| Price comparison of various magnetos for 40/50 HP chassis and 12-cylinder aero engines. | 9th Sep 1927 | Box 48 \ 2 Scan206 | |
| Two Scintilla 6-cylinder magnetos in stock, which are to be sent to Scintilla Ltd. for inspection and payment. | 23th Jul 1929 | Box 48 \ 2 Scan207 | |
| Offer from Scintilla Ltd. for the disposal of obsolete magnetos. | 15th Aug 1929 | Box 48 \ 2 Scan208 | |
| Agreeing to an offer for the disposal of Scintilla magnetos. | 6th Aug 1929 | Box 48 \ 2 Scan209 | |
| Cover page for a document about the Watford Magneto. | 8th May 1925 | Box 48 \ 2 Scan210 | |
| Examination of a noisy Watford Magneto, No. 58668, from an experimental car. | 30th Jun 1924 | Box 48 \ 2 Scan211 | |
| Examination report detailing the faults found on a Watford EO6 Magneto, serial number 58663. | 26th Jun 1924 | Box 48 \ 2 Scan212 | |
| Instruction sheet detailing observations on a returned Watford E.O.6 magneto. | 30th Jun 1924 | Box 48 \ 2 Scan213 | |
| Instruction sheet detailing magneto test results and noting a failure report on misfires. | 19th May 1924 | Box 48 \ 2 Scan214 | |
| Letter altering the automatic advance speed specification for a 6-cylinder magneto for the 40/50 car. | 27th Aug 1924 | Box 48 \ 2 Scan215 | |
| Instructions detailing the testing of a Watford E06 Magneto returned from repair, with notes on low-speed sparking and a sleeve damping device. | 3rd Sep 1924 | Box 48 \ 2 Scan216 | |
| Instruction note regarding a returned 60-degree range magneto with sleeve noise found to be caused by faulty securing. | 8th Aug 1924 | Box 48 \ 2 Scan217 | |
| Modification of three Watford magnetos for further testing on an EAC.2 chassis. | 30th Dec 1924 | Box 48 \ 2 Scan218 | |
| Quoting a letter from North & Sons Ltd. regarding the modification of Watford magnetos. | 7th Jan 1925 | Box 48 \ 2 Scan219 | |
| Exchanging H.T. collector brushes on Watford magnetos for experimental testing. | 12th Jan 1925 | Box 48 \ 2 Scan220 | |
| Instructions regarding modifications for the E06(d) magneto following production tests. | 21th Jan 1925 | Box 48 \ 2 Scan221 | |
| Instructions to address engine noise from flopping sleeves by modifying the advance lever and cam ring force. | 29th Jun 1920 | Box 48 \ 2 Scan222 | |
| Instructions for engine testing procedures, focusing on magneto performance and addressing distributor gear noise. | 28th Jun 1920 | Box 48 \ 2 Scan223 | |
| Instructions regarding minimum low-speed sparking speeds for magnetos. | 29th Jun 1920 | Box 48 \ 2 Scan224 | |
| Potential wear on the oil relay advance controls and suggesting making the joints larger. | 23th Jan 1925 | Box 48 \ 2 Scan225 | |
| The specification for the Watford Type E06 Magneto for an EAC chassis. | 27th Jan 1925 | Box 48 \ 2 Scan226 | |
| Production inspection and test specification for a Watford Type ED6 (d) Magneto. | 11th Jun 1925 | Box 48 \ 2 Scan227 | |
| Testing procedures for magneto and ignition system components. | 11th Jun 1925 | Box 48 \ 2 Scan228 | |
| Specifications for magneto sparking speeds at different advance positions. | 4th Feb 1925 | Box 48 \ 2 Scan229 | |
| List of Watford magnetos type EC6d available for conversion or requiring updates. | 4th Feb 1925 | Box 48 \ 2 Scan230 | |
| Numerical data for Watford E06 (d) magnetos for EAC chassis. | 6th Feb 1925 | Box 48 \ 2 Scan231 | |
| Extract from the production specification for inspection and testing of Watford E06 (d) magnetos for EAC. | 2nd Feb 1925 | Box 48 \ 2 Scan232 | |
| The examination of a noisy Watford Magneto, No. 73972, from an experimental test engine. | 2nd Feb 1925 | Box 48 \ 2 Scan233 | |
| Analysis of noise reported from a Watford E06 (d) Magneto, No.73972, off test. | 6th Feb 1925 | Box 48 \ 2 Scan234 | |
| Eliminating noise from sleeves and securing silent gears. | 9th Feb 1925 | Box 48 \ 2 Scan235 | |
| Communication regarding a new method for marking teeth on aluminium gears for Watford EO.6 Magnetos. | 9th Feb 1925 | Box 48 \ 2 Scan236 | |
| Instructions to despatch Magneto No. 73972 to Messrs. North & Sons Ltd for examination after testing. | 10th Feb 1925 | Box 48 \ 2 Scan237 | |
| Timing markings on the aluminium wheel for Watford E.O.6 magnetos. | 11th Feb 1925 | Box 48 \ 2 Scan238 | |
| Agreeing on a form of marking for Watford E06 Magnetos. | 12th Feb 1925 | Box 48 \ 2 Scan239 | |
| List of outstanding tests required for the experimental Watford EC6d magneto. | 14th Feb 1925 | Box 48 \ 2 Scan240 | |
| Instructions for timing a magneto using a marked tooth and a list of its technical specifications. | 23th Feb 1921 | Box 48 \ 2 Scan241 | |
| Proposed change to the damping load specification for a magneto operating lever. | 26th Feb 1925 | Box 48 \ 2 Scan242 | |
| Communication detailing the follow-up with North & Sons Ld regarding a complaint about a Watford Magneto. | 3rd Mar 1925 | Box 48 \ 2 Scan243 | |
| Proposed modifications to the EO.6 Watford Magneto and the resulting noise issues. | 4th Mar 1925 | Box 48 \ 2 Scan244 | |
| Letter to Messrs North & Sons regarding operational force and noise issues with a Watford Magneto. | 9th Mar 1925 | Box 48 \ 2 Scan245 | |
| Improving an ignition timing device by reducing sleeve effort, noise, and specifying manufacturing tolerances. | 9th Mar 1925 | Box 48 \ 2 Scan246 | |
| Letter discussing the investigation and resolution of noise from a Watford Magneto No. 73972. | 9th Mar 1925 | Box 48 \ 2 Scan247 | |
| Ease of operation of the E.O.6 Magneto and a proposal from Messrs North's for a modified version. | 12th Mar 1925 | Box 48 \ 2 Scan248 | |
| Correspondence from North & Sons, Ltd. regarding the force required for the advance lever on a Model E.O.6. Magneto. | 11th Mar 1925 | Box 48 \ 2 Scan249 | |
| Resistance and timing specifications for a Watford EC6d Magneto, serial number 73972. | 18th Mar 1925 | Box 48 \ 2 Scan250 | |
| List of magnetos and their specifications for the 40/50 chassis. | 18th Mar 1925 | Box 48 \ 2 Scan251 | |
| Extract detailing the production test results for specific Watford magnetos. | 19th Mar 1925 | Box 48 \ 2 Scan252 | |
| Requesting the return of a Watford EO6 distributor rotor to Messrs. North's for repair. | 20th Mar 1925 | Box 48 \ 2 Scan253 | |
| The testing of a Watford EO6 Magneto, No. 73972. | 23th Mar 1925 | Box 48 \ 2 Scan254 | |
| The testing of a Watford Magneto No. 73972 returned from repair at Messrs. North's due to excessive noise. | 23th Mar 1925 | Box 48 \ 2 Scan255 | |
| Form recording the design and performance details of a Watford magneto. | 26th Mar 1925 | Box 48 \ 2 Scan256 | |
| Specifications for primary point gap, contact breaker timing, and automatic advance characteristics. | 26th Mar 1925 | Box 48 \ 2 Scan257 | |
| Test report detailing endurance, short circuit, and open circuit tests, including a volt-speed curve. | 26th Mar 1925 | Box 48 \ 2 Scan258 | |
| Test results showing ampere-speed curve, utility tests, speed range and sparking characteristics for a component. | 26th Mar 1925 | Box 48 \ 2 Scan259 | |
| Test results page showing secondary milliamps, primary point gap, and contact breaker timing data. | 26th Mar 1925 | Box 48 \ 2 Scan260 | |
| Operational noise, noting issues with unevenly meshing gears and sleeve noise. | 26th Mar 1925 | Box 48 \ 2 Scan261 | |
| Graph of open circuit volt-speed and short circuit ampere-speed curves for the primary winding of a Watford E.D.6.L Magneto. | 4th Apr 1925 | Box 48 \ 2 Scan262 | |
| Blank document page with a publication department date stamp. | 4th Apr 1925 | Box 48 \ 2 Scan263 | |
| Modifications and noise levels of a Watford EO.6 Magneto. | 30th Mar 1925 | Box 48 \ 2 Scan264 | |
| Instructions for an experimental comparative test of a Watford E06d magneto. | 1st Apr 1925 | Box 48 \ 2 Scan265 | |
| The handing in of two Watford EO6 magnetos to the Experimental Stores. | 17th Apr 1925 | Box 48 \ 2 Scan266 | |
| Return of a Watford E06 Magneto for repair and modification. | 17th Apr 1925 | Box 48 \ 2 Scan267 | |
| Letter regarding an E.O.6 Magneto with modified controls being sent for testing and a report. | 27th Apr 1925 | Box 48 \ 2 Scan268 | |
| Correspondence quoting a letter from North & Sons Ltd. about a noisy magneto being sent for inspection. | 27th Apr 1925 | Box 48 \ 2 Scan269 | |
| Investigation into the operational noise of a Watford E06d magneto, described as 'flopping of the sleeves'. | 28th Apr 1925 | Box 48 \ 2 Scan270 | |
| Instructions regarding the finer location of a brass sleeve securing collar and clearances within a magneto assembly. | 9th Mar 1925 | Box 48 \ 2 Scan271 | |
| Instruction sheet detailing methods to reduce oscillation and noise by adjusting collar clearance and introducing a felt ring. | 29th Jun 1920 | Box 48 \ 2 Scan272 | |
| Agreeing to the quoted cost for the conversion of a Watford EC6 Magneto. | 8th May 1925 | Box 48 \ 2 Scan273 | |
| The return of a Watford EC6 Magneto to Messrs. North. | 5th May 1925 | Box 48 \ 2 Scan274 | |
| Quote from North & Sons Ltd. for modifying a Watford EO.6 Magneto to increase its range of advance. | 7th May 1925 | Box 48 \ 2 Scan275 | |
| Modifications to the Watford Magneto following correspondence with North & Sons. | 8th May 1925 | Box 48 \ 2 Scan276 | |
| Failed Watford magneto contact breaker lever and its potential repair. | 9th May 1925 | Box 48 \ 2 Scan277 | |
| Bench test results and potential modifications for a Watford Magneto, No. 81062, focusing on noise and clearance issues. | 13th May 1925 | Box 48 \ 2 Scan278 | |
| The testing of an experimental magneto, which showed improvement but was not entirely satisfactory. | 13th May 1925 | Box 48 \ 2 Scan279 | |
| Testing the Watford E06 Magneto No. 81062, focusing on noise reduction from improved sleeve location. | 13th May 1925 | Box 48 \ 2 Scan280 | |
| Faulty Watford EC6 Magneto being returned to its makers for repair and updating. | 15th May 1925 | Box 48 \ 2 Scan281 | |
| Improvements to the Watford Magneto and the associated supplier price increase. | 15th May 1925 | Box 48 \ 2 Scan282 | |
| The improved Watford Magneto, supply arrangements, and pricing with North & Sons Ltd. | 15th May 1925 | Box 48 \ 2 Scan283 | |
| Typed note urging an immediate decision regarding the supply of magnetos. | 15th May 1925 | Box 48 \ 2 Scan284 | |
| Copy of a letter from North & Sons, Ltd. regarding the manufacture and modification of magnetos. | 14th May 1925 | Box 48 \ 2 Scan285 | |
| Letter from North & Sons Ltd. discussing a proposal for an order of machines and associated modifications. | 14th May 1925 | Box 48 \ 2 Scan286 | |
| Report from North & Sons Ltd regarding the modification and repair of a fractured Watford Magneto Contact Breaker B.9224. | 16th May 1925 | Box 48 \ 2 Scan287 | |
| Chassis 93-NK after 15,447 miles, detailing issues and repairs to the magneto and ignition system. | 20th May 1925 | Box 48 \ 2 Scan288 | |
| Correspondence with North & Sons regarding testing and modifications for a Watford Magneto No. 81062. | 22th May 1925 | Box 48 \ 2 Scan289 | |
| Quoting a reply from North & Sons Ltd. concerning the testing and repair of a Watford EO.6 Magneto. | 3rd Jun 1925 | Box 48 \ 2 Scan290 | |
| Alteration to the inspection and test specification for a Watford Type EC6(d) magneto. | 11th Jun 1925 | Box 48 \ 2 Scan291 | |
| Special E.O.6 Magneto, No. 82558, brought in for testing. | 17th Jun 1925 | Box 48 \ 2 Scan292 | |
| Instruction sheet detailing the test schedule and results for a Watford E06d magneto. | 6th Jul 1925 | Box 48 \ 2 Scan293 | |
| Instructions and observations regarding magneto performance and characteristics. | 29th Jun 1920 | Box 48 \ 2 Scan294 | |
| Instructions sheet with a handwritten report on the performance and noise levels of a magneto. | 28th Aug 1920 | Box 48 \ 2 Scan295 | |
| Instruction sheet detailing the advantages of a feature improvement on a magneto's mechanical performance. | 29th Aug 1920 | Box 48 \ 2 Scan296 | |
| Requesting the reconditioning of Watford E06 magnetos and their modification to match a new larger air gap design. | 8th Jul 1925 | Box 48 \ 2 Scan297 | |
| Test report on a Watford EC6d Magneto, serial number 82558, with a modified air gap. | 8th Jul 1925 | Box 48 \ 2 Scan298 | |
| The performance and noise reduction of an altered magneto, following an assistant's test. | 8th Jul 1925 | Box 48 \ 2 Scan299 | |
| Explaining the methodology for creating and interpreting utility performance curves for magnetos. | 9th Jul 1925 | Box 48 \ 2 Scan300 | |
| Performance comparison of a special magneto against a standard machine, noting its compliance with specifications. | 9th Jul 1925 | Box 48 \ 2 Scan301 | |
| Utility performance curves for standard annular gap and leak of Watford magnetos. | 9th Jul 1925 | Box 48 \ 2 Scan302 | |
| Instruction to dispatch two magnetos to Messrs. North & Sons for re-conditioning. | 9th Jul 1925 | Box 48 \ 2 Scan303 | |
| Instruction sheet detailing the failure of a Watford magneto on a 10 EAC 2 engine during testing. | 17th Jul 1925 | Box 48 \ 2 Scan304 | |
| Instruction sheet detailing the causes of magneto service failures. | 29th Jun 1920 | Box 48 \ 2 Scan305 | |
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