| Description | Date | Identifier | |
| Road and bench testing of experimental magnetos, detailing performance variations and starting issues. | 20th Jul 1929 | Box 65 \ 3 scan0386 | |
| The performance and endurance testing of magnetos, comparing EW6A, standard EW6, and R.Bosch models. | 20th Jul 1929 | Box 65 \ 3 scan0387 | |
| Trouble with platinum points on EW6 and EW6A magnetos and proposed solutions. | 22th Jul 1929 | Box 65 \ 3 scan0388 | |
| Letter to Messrs. North & Sons regarding the performance of type LW6A magnetos. | 22th Jul 1929 | Box 65 \ 3 scan0389 | |
| Confirming a Watford EW6 magneto is being sent to the Repair Dept. Stores to credit an order. | 26th Aug 1929 | Box 65 \ 3 scan0390 | |
| The status and allocation of four Watford EW6 magnetos for S.S. Production. | 26th Aug 1929 | Box 65 \ 3 scan0391 | |
| Condition and despatch of four Watford E.W.6. magnetos from the Experimental Department. | 29th Aug 1929 | Box 65 \ 3 scan0392 | |
| Letter to Messrs. North & Sons Ltd. regarding the lubrication frequency for the E.W.6 Magneto. | 10th Sep 1929 | Box 65 \ 3 scan0393 | |
| Discrepancy in timing markings for the E.W.6 magneto on S.S. chassis and suggesting an alteration. | 1st Sep 1929 | Box 65 \ 3 scan0394 | |
| Letter from North & Sons Ltd. concerning the lubrication of an E.W.6. Magneto and an instruction booklet alteration. | 11th Sep 1929 | Box 65 \ 3 scan0395 | |
| Confirming a change to the lubrication instructions for the E.W.6 Magneto. | 2nd Sep 1929 | Box 65 \ 3 scan0396 | |
| Query regarding the alteration of Watford Type EW6 magnetos for a U.S.A. model SS chassis. | 9th Sep 1929 | Box 65 \ 3 scan0397 | |
| Suggestion to convert three R.H. rotation Watford type EW.6 magnetos to suit S.S. chassis production. | 17th Oct 1929 | Box 65 \ 3 scan0398 | |
| Return of three R.H. rotation magnetos to be converted to standard L.H. rotation machines. | 21th Oct 1929 | Box 65 \ 3 scan0399 | |
| Requesting a report on the premature burning of platinum contact breaker points on magnetos. | 24th Oct 1929 | Box 65 \ 3 scan0400 | |
| Issue of platinum contact breaker points burning away on standard magnetos. | 24th Oct 1929 | Box 65 \ 3 scan0401 | |
| Customer complaint about prematurely burnt out contact breaker points on a standard magneto. | 28th Oct 1929 | Box 65 \ 3 scan0402 | |
| Response to an enquiry regarding the wear and lifespan of contact breaker points on standard magnetos. | 6th Nov 1929 | Box 65 \ 3 scan0403 | |
| Recurring failures of Watford magnetos on Phantom I & II cars. | 7th Nov 1929 | Box 65 \ 3 scan0404 | |
| The premature burning of platinum points in Watford E.W.6 magnetos on Phantom I & II cars. | 1st Nov 1929 | Box 65 \ 3 scan0405 | |
| Troubleshooting E.W.6 magnetos with the supplier, Messrs. North, including experiments with different contact breaker points. | 11th Nov 1929 | Box 65 \ 3 scan0406 | |
| Handling of a Watford EW6 magneto being sent to stores for overhaul. | 20th Nov 1929 | Box 65 \ 3 scan0407 | |
| Requesting the repair of a Watford EW6 magneto removed from chassis 18-EX due to a bad knock. | 10th Dec 1929 | Box 65 \ 3 scan0408 | |
| Instruction on issues with Watford EWB magnetos during endurance tests, recommending a switch to jump spark distributors. | 12th Dec 1929 | Box 65 \ 3 scan0409 | |
| Responding to a query about contact breaker points on Watford E.W.6 magnetos and suggesting room for improvement. | 30th Dec 1929 | Box 65 \ 3 scan0410 | |
| The failure of a magneto on chassis 1-WJ, including quotes from the manufacturer. | 20th Jun 1930 | Box 65 \ 3 scan0411 | |
| Magneto failure on trials car chassis no. 1-WJ. | 23th Jun 1930 | Box 65 \ 3 scan0412 | |
| Potential magneto failure on Chassis 1-WJ and criticising a previous unsatisfactory explanation. | 24th Jun 1930 | Box 65 \ 3 scan0413 | |
| Letter from a supplier discussing the function of a safety gap in a magneto and issues caused by excessive resistance. | 9th Jul 1930 | Box 65 \ 3 scan0414 | |
| Continuation sheet from North & Sons Ltd. discussing safety gap issues on Watford Magnetos. | 9th Jul 1930 | Box 65 \ 3 scan0415 | |
| Forwarding a letter from Messrs North & Sons regarding chassis 1 WJ. | 10th Jul 1930 | Box 65 \ 3 scan0416 | |
| Extract from G.W. Hancock's report on the condition of the magneto on vehicle 24-EX at 6,000 miles. | 20th Jul 1930 | Box 65 \ 3 scan0417 | |
| Extract from G.W. Hancock's report on the magneto condition of car 24-EX after 10,000 miles. | 15th Aug 1930 | Box 65 \ 3 scan0418 | |
| Internal request to order six Watford EW6 magneto distributor carbon brushes for experimental work. | 14th Jan 1930 | Box 65 \ 3 scan0419 | |
| Extract detailing cost options for a 40/50 HP Magneto, comparing Iridio Platinum Points with Tungsten Points. | 22th Jan 1930 | Box 65 \ 3 scan0420 | |
| Experimental use and standardization of tungsten points for 40/50 HP magnetos, type E.W.6. | 23th Jan 1930 | Box 65 \ 3 scan0421 | |
| Urgent dispatch of two magnetos, confirming one has been sent and the other will follow. | 1st Feb 1930 | Box 65 \ 3 scan0422 | |
| Production inspection and test log for a Watford Type SW6A Magneto. | 3rd Feb 1928 | Box 65 \ 3 scan0423 | |
| Confirmation of the return of a Watford E.W.6 magneto. | 6th Mar 1930 | Box 65 \ 3 scan0424 | |
| The overhaul of a Watford EW6 Magneto. | 3rd May 1930 | Box 65 \ 3 scan0425 | |
| Repairing two failed contact breakers from Watford EW6 magnetos by replacing the platinum points with tungsten. | 4th Oct 1930 | Box 65 \ 3 scan0426 | |
| Request for low-speed sparking figures for a specific Watford E.W.6 Magneto. | 4th Jan 1931 | Box 65 \ 3 scan0427 | |
| Investigation into a complaint about Watford EW6 magnetos causing starting difficulties and backward firing on a Phantom II engine. | 15th Jan 1931 | Box 65 \ 3 scan0428 | |
| Magneto performance and timing, noting it fails the low speed sparking specification. | 15th Jan 1931 | Box 65 \ 3 scan0429 | |
| Distributor dimensions and ignition timing calculations. | 15th Jan 1931 | Box 65 \ 3 scan0430 | |
| Page of suggestions regarding distributor timing to prevent the engine from running backwards. | 6th Jan 1931 | Box 65 \ 3 scan0431 | |
| Circumstances of engine back-running when starting the P.2 engine by hand on magneto ignition. | 6th Jan 1931 | Box 65 \ 3 scan0432 | |
| Engine backward running issues related to magneto and distributor timing. | 16th Jan 1931 | Box 65 \ 3 scan0433 | |
| Out-of-spec low-speed sparking on a Watford E.W.6 magneto, causing starting difficulties. | 7th Jan 1931 | Box 65 \ 3 scan0434 | |
| Letter concerning the return and timing issues of a Watford E.W.6. Magneto, including a tester's report on starting problems. | 19th Jan 1931 | Box 65 \ 3 scan0435 | |
| Page 2 of a letter to Messrs. North & Sons, Ltd. regarding engine starting issues and magneto testing. | 19th Jan 1930 | Box 65 \ 3 scan0436 | |
| Issues with magneto ignition on Phantom II cars, particularly its performance at slow cranking speeds. | 19th Jan 1931 | Box 65 \ 3 scan0437 | |
| Test results for a Watford E.W.6 Magneto, serial number 127221, for chassis number 27-EX. | 15th Jan 1931 | Box 65 \ 3 scan0438 | |
| Instruction to despatch a Watford E.W.6 Magneto to Messrs. North & Sons for modification. | 26th Jan 1931 | Box 65 \ 3 scan0439 | |
| Failed Watford EW6 Magneto to be returned to the makers for repair. | 31th Mar 1932 | Box 65 \ 3 scan0440 | |
| Secret memorandum regarding the weight of the crankcase and a request to investigate potential weight reduction. | 3rd Jun 1924 | Box 65 \ 4 scan0001 | |
| Secret memorandum detailing modifications to the EAC.2 crankcase to suit longer connecting rods. | 6th Mar 1924 | Box 65 \ 4 scan0002 | |
| Complaint about the weight of an E.A.C.II crankcase and proposing actions to investigate. | 5th Jun 1924 | Box 65 \ 4 scan0003 | |
| Modifying the crankcase to accommodate a larger ignition governor. | 16th Aug 1924 | Box 65 \ 4 scan0004 | |
| Secret memo regarding the design and testing of crankcase oil baffles to reduce oil consumption. | 29th Apr 1925 | Box 65 \ 4 scan0005 | |
| Solution for an oil leak at the rear end of EAC and 20 HP engines. | 27th Aug 1925 | Box 65 \ 4 scan0006 | |
| Use of shorter connecting rods on a lighter Phantom engine to reduce weight and crankcase height. | 2nd Feb 1926 | Box 65 \ 4 scan0007 | |
| Modifications to the Lighter Phantom Engine's connecting rods. | 15th Apr 1926 | Box 65 \ 4 scan0008 | |
| Oil flow measurements through bearings for car 67-TC. | 1st Jul 1926 | Box 65 \ 4 scan0009 | |
| Sending drawings for the Phantom Sports Engine regarding the crankcase, cylinder blocks, and valve gear. | 1st Aug 1927 | Box 65 \ 4 scan0010 | |
| Proposed modifications to the Sports Phantom engine's crankchamber and related components. | 19th Sep 1927 | Box 65 \ 4 scan0011 | |
| Recurring crack in the Phantom engine crankcase during high-speed testing. | 24th Sep 1926 | Box 65 \ 4 scan0012 | |
| Considering a single block design for new cylinder blocks to reduce the possibility of a potential issue. | 24th Sep 1929 | Box 65 \ 4 scan0013 | |
| Blueprint diagram illustrating the position of cracks in a Phantom crankcase. | 24th Sep 1929 | Box 65 \ 4 scan0014 | |
| Confirming the handover of sentinels for testing crankcase temperatures. | 26th Sep 1927 | Box 65 \ 4 scan0015 | |
| Alterations to the Sports Phantom crankchamber design. | 1st Oct 1927 | Box 65 \ 4 scan0016 | |
| Confirmation of a phone message from R. to Hs. about alterations required for a final sports car due to a broken crankchamber. | 10th Aug 1927 | Box 65 \ 4 scan0017 | |
| Drawing LeC.2471 for the Sports Phantom oil strainer. | 1st Oct 1927 | Box 65 \ 4 scan0018 | |
| Design revisions for the Sports Phantom wheelcase and gears. | 8th Oct 1927 | Box 65 \ 4 scan0019 | |
| Implementing improvements for the Sports Phantom and the next 10,000 miles car. | 10th Aug 1927 | Box 65 \ 4 scan0020 | |
| Scheme for the Sports Phantom's oil level indicator and lower half crankcase. | 11th Oct 1927 | Box 65 \ 4 scan0021 | |
| Modification to the oil gallery pipe for the Sports Phantom crankchamber. | 10th Oct 1927 | Box 65 \ 4 scan0022 | |
| Improvements for a sports car, including a new crankchamber and piston, for a 10,000-mile test in France. | 17th Oct 1927 | Box 65 \ 4 scan0023 | |
| Modifications to the Sports Phantom crankchamber. | 9th Oct 1927 | Box 65 \ 4 scan0024 | |
| Design modifications to the Phantom engine, focusing on lowering the chassis and relocating engine accessories. | 28th Oct 1927 | Box 65 \ 4 scan0025 | |
| Revolution counter drive on the 10-EX model, suggesting a camshaft drive as an improvement. | 3rd Nov 1927 | Box 65 \ 4 scan0026 | |
| Dimensional drawing for a revolution gauge casing. | 2nd Nov 1927 | Box 65 \ 4 scan0027 | |
| Design changes for the oil relief unit, gallery pipe, and crankchamber, referencing drawing Lec. 2483. | 9th Nov 1927 | Box 65 \ 4 scan0028 | |
| Engine suspension system for the Sports Phantom model. | 16th Nov 1927 | Box 65 \ 4 scan0029 | |
| Design modifications for Sports Phantom main bearing caps. | 16th Nov 1927 | Box 65 \ 4 scan0030 | |
| Revised design of the crankshaft and connecting rods for EAC.10 & 14 models. | 25th Nov 1927 | Box 65 \ 4 scan0031 | |
| Casting in aluminium and bronze, focusing on achieving the strongest and lightest castings for crankchambers. | 1st Dec 1927 | Box 65 \ 4 scan0032 | |
| Request to measure the Young's Modulus of Elasticity for various crankcase materials. | 29th Aug 1928 | Box 65 \ 4 scan0033 | |
| Standardisation report for a felt strip on the engine guard to prevent mud ingress. | 9th Feb 1926 | Box 65 \ 4 scan0034 | |
| Proposal to increase the stiffness of the E.A.C. engine's front-end carrying tube by inserting an inner tube. | 25th Feb 1925 | Box 65 \ 4 scan0035 | |
| Revision of engine front bearer tubes, detailing a new drawing, stress reduction, and material choice. | 28th Feb 1925 | Box 65 \ 4 scan0036 | |
| Dispatch and testing of new double-tube engine bearers. | 3rd Mar 1925 | Box 65 \ 4 scan0037 | |
| Secret memo discussing three manufacturing schemes for the engine's front bearer tube, comparing cost and materials. | 1st Mar 1925 | Box 65 \ 4 scan0038 | |
| Particulars for engine bearer arms, including dimensions, material, and heat treatment. | 16th Mar 1925 | Box 65 \ 4 scan0039 | |
| Secret memo regarding particulars for Engine - Front Suspension Tubes. | 17th Mar 1925 | Box 65 \ 4 scan0040 | |
| The failure of a new front engine suspension design for the 98-NK car. | 20th Mar 1925 | Box 65 \ 4 scan0041 | |
| Telegram discussing a coupling failure, accepting fault and proposing design modifications. | 7th Apr 1925 | Box 65 \ 4 scan0042 | |
| Production difficulties with the load specification for a Torque Reaction Damper. | 9th Jun 1925 | Box 65 \ 4 scan0043 | |
| Urging a decision on Spring F.1456 for the Torque Reaction Damper to avoid production delays. | 11th Jun 1925 | Box 65 \ 4 scan0044 | |
| Test loading for EAC Torque Reaction Dampers, requesting testing to find the lowest allowable loading range. | 18th Jun 1925 | Box 65 \ 4 scan0045 | |
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