| Description | Date | Identifier | |
| Requesting failed ignition components for examination in the Electrical Laboratory. | 3rd May 1937 | Box 164 \ 5 img276 | |
| On ignition coil primary connections, requesting an alteration to the coil top plate based on recent tests on a Phantom III chassis. | 3rd May 1937 | Box 164 \ 5 img277 | |
| Arranging to send two new type ignition coils, part D.75673. | 6th May 1937 | Box 164 \ 5 img278 | |
| Request to arrange sending two ignition coils, part D.75673, to the Sales department. | 6th May 1937 | Box 164 \ 5 img279 | |
| Modifications required for coil D.75672 following experimental testing. | 11th May 1937 | Box 164 \ 5 img280 | |
| Blueprints for the windings of the Wraith III ignition coil. | 26th May 1937 | Box 164 \ 5 img281 | |
| Potential alteration to the Phantom III Ignition Coil and its production implications. | 26th May 1937 | Box 164 \ 5 img282 | |
| Request to perform ignition coil performance tests on four different coils to find the best performing one. | 27th May 1937 | Box 164 \ 5 img283 | |
| Desired modifications for the Wraith Ignition coil. | 27th May 1937 | Box 164 \ 5 img284 | |
| Diagnosing a misfire in a Phantom III by swapping coils, noting variations in standard coil output. | 2nd Jun 1937 | Box 164 \ 5 img285 | |
| Slow running, performance, acceleration, and hill climb tests for a GAE-20 30 HP engine. | 1st Jun 1937 | Box 164 \ 5 img286 | |
| Test report on tappet clearances, ignition coils, and carburetor systems to improve engine slow running performance. | 1st Jun 1937 | Box 164 \ 5 img287 | |
| Summary of engine tests noting temperature rise after idling and a list of four modifications made. | 1st Jun 1937 | Box 164 \ 5 img288 | |
| Standardisation of an ignition coil with reversed primary connections for the Phantom III to improve misfiring. | 2nd Jun 1937 | Box 164 \ 5 img289 | |
| Value of coils obtained from a Mr. Williams in relation to a patent specification. | 3rd Jun 1937 | Box 164 \ 5 img290 | |
| Proposal to reverse the primary winding direction on ignition coils for 25/30 HP and Bentley Chassis. | 9th Jun 1937 | Box 164 \ 5 img291 | |
| Approving a modified ignition coil with reversed primary connections for replacement purposes. | 11th Jun 1937 | Box 164 \ 5 img292 | |
| Instructing replacement of a high tension coil and a ballast resistance on a car. | 15th Jun 1937 | Box 164 \ 5 img293 | |
| Standardisation of an ignition coil with a reversed primary to reduce plug voltage. | 17th Jun 1937 | Box 164 \ 5 img294 | |
| Standardisation of an ignition coil with reversed primary connections to reduce plug voltage. | 17th Jun 1937 | Box 164 \ 5 img295 | |
| The standardization of parts for the 'L' Series chassis, with no extra tool cost. | 12th Aug 1931 | Box 164 \ 5 img297 | |
| The replacement of R.R. type ignition coils with Lucas coils for chassis 32-EX. | 2nd Jul 1937 | Box 164 \ 5 img298 | |
| Two D.75673 ignition coils to be fitted to trial cars for testing. | 6th Jul 1937 | Box 164 \ 5 img299 | |
| Letter to Lucas Ltd. requesting the urgent supply of two R.R.12 ignition coils for a car going to France. | 8th Jul 1937 | Box 164 \ 5 img300 | |
| Internal request for the manufacture of 12 ignition coil cases and 12 coil terminal heads for despatch to Joseph Lucas Ltd. | 14th Jul 1937 | Box 164 \ 5 img301 | |
| Ignition coil performance tests and a recommendation for future coil winding specifications. | 25th Aug 1937 | Box 164 \ 5 img302 | |
| Misfiring issue with ignition coils on a Wraith model, potentially due to induced sparking. | 16th Sep 1937 | Box 164 \ 5 img303 | |
| Road testing faulty Lucas type coils from car 32-EX, with further tests planned. | 22th Sep 1937 | Box 164 \ 5 img304 | |
| Investigation into misfiring on the Wraith experimental chassis, comparing three types of ignition coils. | 1st Oct 1937 | Box 164 \ 5 img305 | |
| Note on testing the polarity of experimental and standard production coils. | 1st Oct 1937 | Box 164 \ 5 img306 | |
| Inquiry to Ferranti Ltd. regarding apparatus for measuring the high tension voltages of ignition coils. | 2nd Oct 1933 | Box 164 \ 5 img307 | |
| Letter from Ferranti Ltd. declining to quote for an instrument to test ignition coils. | 4th Oct 1937 | Box 164 \ 5 img308 | |
| The correct connection of ignition coils on experimental cars based on polarity markings. | 23th Oct 1937 | Box 164 \ 5 img309 | |
| Five points of action regarding the Wraith ignition coil. | 29th May 1937 | Box 164 \ 5 img310 | |
| Alteration notice for the Wraith Ignition Coil, listing new parts and suggesting a die modification. | 1st Jul 1937 | Box 164 \ 5 img311 | |
| Modifications to the Wraith ignition coil for flexible connections and polarity reversal. | 1st Jul 1937 | Box 164 \ 5 img312 | |
| Suggestion for fitting PIII ignition coils to facilitate fan adjustment and prevent damage. | 22th Nov 1937 | Box 164 \ 5 img313 | |
| Testing, comparison, and failure analysis of various ignition coils. | 26th Oct 1937 | Box 164 \ 5 img314 | |
| Impregnation of ignition coils with bitumen compound and their attached output curves. | 26th Oct 1937 | Box 164 \ 5 img315 | |
| Graph comparing the performance of different chassis ignition coils. | 25th Oct 1937 | Box 164 \ 5 img316 | |
| Suggestion to reposition ignition coil terminals on the Phantom III Chassis to prevent damage during fan adjustment. | 3rd Nov 1937 | Box 164 \ 5 img317 | |
| Orientation of ignition coils on the Phantom III Chassis. | 12th Nov 1937 | Box 164 \ 5 img318 | |
| Recommendation to remount the Phantom III ignition coils to avoid interference with the fan during adjustment. | 29th Nov 1937 | Box 164 \ 5 img319 | |
| Corona discharge issue found during an open-circuit test on a Wraith Type Coil, recommending a smaller insert for better clearance. | 15th Nov 1937 | Box 164 \ 5 img320 | |
| Modification to the windings of ignition coils for the Wraith model. | 8th Dec 1937 | Box 164 \ 5 img321 | |
| Advantageous alteration to the ignition coil fixing on the Phantom III. | 22th Dec 1937 | Box 164 \ 5 img322 | |
| Agreement to alter the fixing of the Phantom III ignition coils. | 24th Dec 1937 | Box 164 \ 5 img323 | |
| Graph comparing the performance of various chassis ignition coils, plotting secondary kilo volts against sparks per second. | 1st Jun 1937 | Box 164 \ 5 img324 | |
| Graph comparing the performance of different chassis ignition coils. | 24th May 1937 | Box 164 \ 5 img325 | |
| Estimated cost breakdown and savings calculation for a coil, part number D.75673. | 22th Feb 1938 | Box 164 \ 5 img326 | |
| Telegram received by telephone regarding a delay for Robotham, a fitting, and mileage covered. | 22th Feb 1938 | Box 164 \ 5 img327 | |
| Standardizing coils and troubleshooting a misfiring issue on car 6.B.IV. | 23th Feb 1938 | Box 164 \ 5 img328 | |
| Issues with a Delco-Remy coil and KLG spark plugs on a Bentley car. | 28th Feb 1938 | Box 164 \ 5 img330 | |
| The despatch of coil cases and heads to Messrs. Lucas and the subsequent ordering of coils. | 2nd Mar 1938 | Box 164 \ 5 img331 | |
| Preliminary tests of a new coil for the Wraith model and its potential standardization. | 3rd Mar 1938 | Box 164 \ 5 img332 | |
| Design and cold-weather testing of an improved ignition coil. | 3rd Mar 1938 | Box 164 \ 5 img333 | |
| Test data comparing a new outside primary ignition coil against a Delco-Remy model. | 3rd Mar 1938 | Box 164 \ 5 img334 | |
| Sending coil cases, heads, and screws to Messrs Lucas for fitting and requesting an official order for the work. | 3rd Mar 1938 | Box 164 \ 5 img335 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the dispatch of coils, an automatic advance arrangement, and a high tension wire sample. | 24th Mar 1938 | Box 164 \ 5 img336 | |
| Instructions for modifying the ignition circuit on Wraith experimental cars to improve starting ability. | 31th Mar 1938 | Box 164 \ 5 img337 | |
| Requesting a covering order for three RR12 ignition coils supplied by Messrs. Lucas. | 8th Apr 1938 | Box 164 \ 5 img338 | |
| The fitting of Delco ignition coils for the Wraith III model. | 13th Apr 1938 | Box 164 \ 5 img339 | |
| The production of half a dozen new coil brackets for testing on Wraith III ignition coils. | 26th Apr 1938 | Box 164 \ 5 img340 | |
| Letter to Delco Remy & Hyatt Ltd. regarding ignition coil temperature tests and a request for a service guarantee. | 5th May 1938 | Box 164 \ 5 img341 | |
| Engine flywheel advance settings and discussing spring drive modifications. | 5th May 1938 | Box 164 \ 5 img342 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the supply and modification of coils and distributors. | 6th May 1938 | Box 164 \ 5 img343 | |
| Decision on ignition coils for the Wraith model, pending further testing with Delco coils. | 10th May 1938 | Box 164 \ 5 img344 | |
| Coil temperature tests comparing the cooling effect of metal versus bakelite ignition coil cases. | 12th May 1938 | Box 164 \ 5 img345 | |
| Test report comparing the primary temperatures of various coils under different conditions at an ambient temperature of 70°C. | 1st Dec 1938 | Box 164 \ 5 img346 | |
| Issues with ignition coils for the Wraith model, specifically internal overheating and the risks of not using a ballast resistor. | 18th May 1938 | Box 164 \ 5 img347 | |
| Specification for a 'Glowray' Ballast and the production test of an ignition coil ballast. | 20th May 1938 | Box 164 \ 5 img348 | |
| Production test specification for an Ignition Coil Ballast Resistance to LOP. DW.296 using 'Glowray' wire. | 20th May 1938 | Box 164 \ 5 img349 | |
| Request for temperature test figures on standard production ignition coils for Bentley and Phantom III models. | 20th May 1938 | Box 164 \ 5 img350 | |
| The advantages of metal-cased ignition coils and the commencement of new tests. | 23th May 1938 | Box 164 \ 5 img351 | |
| Request to obtain a new 'Sports' ignition coil from Messrs. Lucas for a 12 volt system. | 25th May 1938 | Box 164 \ 5 img352 | |
| Temporary metal case to test temperature drop on Wraith III ignition coils. | 25th May 1938 | Box 164 \ 5 img353 | |
| Requesting an order for Bentley III Ignition Coils from Delco Remy Ltd. | 27th May 1938 | Box 164 \ 5 img354 | |
| Requesting a covering order for three high output Delco Remy ignition coils. | 11th Jun 1938 | Box 164 \ 5 img355 | |
| Invoice for Delco-Remy Coils which cannot be traced in the Stores Department. | 28th Jun 1938 | Box 164 \ 5 img356 | |
| Invoice for headlamps and a coffee pot received against an untraceable order, requesting their return. | 28th Jun 1928 | Box 164 \ 5 img357 | |
| Request to issue a covering order for Delco ignition coils and a Delco Remy starter motor. | 2nd Jul 1938 | Box 164 \ 5 img358 | |
| Invoice from Delco-Remy & Hyatt Ltd. for 12 Volt Delco Ignition Coils. | 14th Jul 1938 | Box 164 \ 5 img359 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding a delayed invoice for six ignition coils delivered the previous year. | 11th Jul 1938 | Box 164 \ 5 img360 | |
| Requesting a metal case be made for a Wraith ignition coil for a temporary temperature test. | 13th Jun 1938 | Box 164 \ 5 img361 | |
| Requesting parts for a Wraith ignition coil experiment using a Delco-Remy case and Mexphalte compound. | 16th Jun 1938 | Box 164 \ 5 img362 | |
| Scheme showing how to test an existing ignition coil in a Delco metal case. | 20th Jun 1938 | Box 164 \ 5 img363 | |
| The testing procedure for the Wraith Delco ignition coil. | 23th Jun 1938 | Box 164 \ 5 img364 | |
| Proposal for an ignition coil with a longer, larger diameter sheet metal case and new winding specifications. | 29th Jun 1938 | Box 164 \ 5 img365 | |
| Requesting the arrangement of special brackets for a Delco-Remy coil. | 6th Jul 1938 | Box 164 \ 5 img366 | |
| Request for the production of seven sets of coil fittings for the Wraith Ignition Coil. | 12th Jul 1938 | Box 164 \ 5 img367 | |
| Graph comparing the performance of ignition coils under specific test conditions. | 12th Jul 1938 | Box 164 \ 5 img368 | |
| Graph plotting an unlabeled vertical axis against two horizontal axis scales: 'Secondary Kilo-Volts' and 'Primary Current Amps'. | 12th Jul 1938 | Box 164 \ 5 img369 | |
| Graph plotting Breaks Per Sec. against primary and secondary values. | 12th Jul 1938 | Box 164 \ 5 img370 | |
| Design and winding specifications for various electrical coils. | 12th Jul 1938 | Box 164 \ 5 img372 | |
| Comparative table of specifications for various ignition coils. | 29th Jun 1938 | Box 164 \ 5 img373 | |
| Proposal for a new ignition coil design, including details on its casing and electrical specifications. | 29th Jun 1938 | Box 164 \ 5 img374 | |
| List of materials and specifications for building primary and secondary windings for electrical coils. | 18th Jul 1938 | Box 164 \ 5 img375 | |
| Requesting a covering order to Delco-Remy & Hyatt Ltd. for supplied coils. | 18th Jul 1938 | Box 164 \ 5 img376 | |
| Request to obtain one Runbakes oil immersed ignition coil for a 12 volt system. | 8th Aug 1938 | Box 164 \ 5 img377 | |
| Letter to Delco & Hyatt Ltd. concerning tests carried out on their coil. | 13th Aug 1938 | Box 164 \ 5 img378 | |
| | | | |
