| Description | Date | Identifier | |
| Testing tungsten ignition contact points, comparing results from different mechanical and electrical conditions. | 27th Sep 1927 | Box 35 \ 6 scan 330 | |
| Experiments with ignition system components like tungsten points and scrubbers, comparing Delco-Remy and Bosch systems. | 27th Sep 1927 | Box 35 \ 6 scan 331 | |
| Requesting modification of 12 battery ignition levers with tungsten points. | 4th Oct 1927 | Box 35 \ 6 scan 332 | |
| Requesting that battery ignition contact point levers and screws be re-ground flat. | 4th Oct 1927 | Box 35 \ 6 scan 333 | |
| Comparative performance of different battery ignition systems, focusing on the mechanics and longevity of their contact points. | 6th Oct 1927 | Box 35 \ 6 scan 334 | |
| Development and testing of ignition system components, comparing them to Delco-Remy and Bosch systems. | 10th Oct 1927 | Box 35 \ 6 scan 335 | |
| The use of an ignition coil with and without a ballast resistance. | 6th Oct 1927 | Box 35 \ 6 scan 336 | |
| Testing tungsten ignition contact points, focusing on a three-flat cam modification and a new scrubber design. | 18th Oct 1927 | Box 35 \ 6 scan 337 | |
| Ignition system experiments and a review of battery ignition distributors from the Olympia Show. | 18th Oct 1927 | Box 35 \ 6 scan 338 | |
| Further tests on ignition components, specifically the Delco-Remy system. | 18th Oct 1927 | Box 35 \ 6 scan 339 | |
| Expressing frustration over significant delays in the standardisation of battery ignition tungsten points. | 20th Oct 1927 | Box 35 \ 6 scan 340 | |
| Confirming the standardisation and production instruction for tungsten points for battery ignition. | 21th Oct 1927 | Box 35 \ 6 scan 341 | |
| Electrical experimental record sheet for testing tungsten contact points. | 19th Apr 1926 | Box 35 \ 6 scan 342 | |
| Request to allot six pairs of Tungsten Contact Points from a production order for experimental use. | 21th Oct 1927 | Box 35 \ 6 scan 343 | |
| Request to grind three domed battery ignition tungsten screw points flat for experimental purposes. | 21th Oct 1927 | Box 35 \ 6 scan 344 | |
| Confirming the receipt of 100 pairs of Tungsten Contact Points and how to acquire six for experimental purposes. | 25th Oct 1927 | Box 35 \ 6 scan 345 | |
| Questioning the necessity of the Cashier stocking tungsten contact points due to booking complications. | 26th Oct 1927 | Box 35 \ 6 scan 346 | |
| Handover of six tungsten-pointed rivets for ignition experiments. | 26th Oct 1927 | Box 35 \ 6 scan 347 | |
| Experimental record sheet for Tungsten contact points. | 19th Apr 1926 | Box 35 \ 6 scan 348 | |
| 10,000-mile bench test and subsequent experimental car run of tungsten ignition contact points. | 5th Nov 1927 | Box 35 \ 6 scan 349 | |
| Requesting modifications and assembly of tungsten ignition contact points and heads for experimental testing. | 11th Nov 1927 | Box 35 \ 6 scan 350 | |
| Results of 10,000-mile bench tests on tungsten ignition contact points. | 17th Nov 1927 | Box 35 \ 6 scan 351 | |
| Note on the effect of distributor and rotor types on contact point performance and internal corrosion. | 17th Nov 1927 | Box 35 \ 6 scan 352 | |
| Arrangement to produce tungsten contact points and the urgent requirement of a lever for further testing. | 7th Nov 1927 | Box 35 \ 6 scan 353 | |
| Standardization of battery ignition components and a remaining issue with the distributor. | 8th Nov 1927 | Box 35 \ 6 scan 354 | |
| From EFC to RHC requesting a spring anchor pin be fitted to two tungsten pointed ignition levers. | 9th Nov 1927 | Box 35 \ 6 scan 355 | |
| Requesting a supply of tungsten pointed contact breaker levers and screws for experiments. | 10th Nov 1927 | Box 35 \ 6 scan 356 | |
| Provision and fitting of three sets of battery ignition contact breakers to specific chassis. | 10th Nov 1927 | Box 35 \ 6 scan 357 | |
| Gauge of contact point arms for a contact breaker test. | 10th Nov 1927 | Box 35 \ 6 scan 358 | |
| The standardisation of battery ignition for 'M' and F.2 series chassis, and querying terminal support details. | 11th Nov 1927 | Box 35 \ 6 scan 359 | |
| Requesting the supply of Tungsten contact rivets and screws for an experimental order. | 11th Nov 1927 | Box 35 \ 6 scan 360 | |
| Requesting the fitting of 12 tungsten rivets to 12 standard contact breaker levers. | 14th Nov 1927 | Box 35 \ 6 scan 361 | |
| Standardisation and testing of battery ignition terminal supports. | 14th Nov 1927 | Box 35 \ 6 scan 362 | |
| Requesting two new contact breaker units with scrubbing contacts be fitted to two cars for a 10,000-mile test. | 19th Nov 1927 | Box 35 \ 6 scan 363 | |
| Improvements to the 'make and break' battery ignition system for F.2 and 'M' chassis. | 21th Nov 1927 | Box 35 \ 6 scan 364 | |
| Request to arrange for two more models of scrubbing contacts with different flexibility. | 22th Nov 1927 | Box 35 \ 6 scan 365 | |
| Test results for different designs of tungsten ignition contact points. | 24th Nov 1927 | Box 35 \ 6 scan 366 | |
| Systematic testing plan for an apparatus by altering four specific components. | 24th Nov 1927 | Box 35 \ 6 scan 367 | |
| Continued memo discussing test results for case 2+3 and outlining current test parameters. | 24th Nov 1927 | Box 35 \ 6 scan 368 | |
| Trial of different thickness 'anvils' for tungsten ignition contact points as requested by Mr. Royce. | 24th Nov 1927 | Box 35 \ 6 scan 369 | |
| Test results for different tungsten ignition contact points. | 24th Nov 1927 | Box 35 \ 6 scan 370 | |
| Experimental testing strategy for an apparatus, comparing different combinations of four modifications. | 24th Nov 1927 | Box 35 \ 6 scan 371 | |
| Page three of a document discussing the results of a test case involving a standard lever. | 24th Nov 1927 | Box 35 \ 6 scan 372 | |
| Requesting a battery ignition contact breaker test unit be fitted to chassis 11-G3. | 24th Nov 1927 | Box 35 \ 6 scan 373 | |
| Improvements for battery ignition systems and plugs, comparing English porcelain plugs to Champion plugs for aero engines. | 28th Nov 1927 | Box 35 \ 6 scan 374 | |
| 10,000-mile bench test of new tungsten ignition contact points. | 29th Nov 1927 | Box 35 \ 6 scan 375 | |
| Test results for different ignition contact point configurations, specifically anvil thickness and distributor setup. | 12th Dec 1927 | Box 35 \ 6 scan 376 | |
| The ongoing tests of different scrubbing arm types and their combinations. | 12th Dec 1927 | Box 35 \ 6 scan 377 | |
| Results of a contact breaker unit test with a .080' anvil and requesting a re-test with a .064' anvil and a new quicker break cam. | 12th Dec 1927 | Box 35 \ 6 scan 378 | |
| Instruction to limit production of the existing make & break mechanism for the 20 HP & 40/50 HP chassis due to a new design. | 8th Dec 1927 | Box 35 \ 6 scan 379 | |
| Modifications to the Make and Break Mechanism for the 20HP and 40/50HP models. | 9th Dec 1927 | Box 35 \ 6 scan 380 | |
| Experimental improvements to battery ignition systems, coil construction, and materials. | 9th Dec 1927 | Box 35 \ 6 scan 381 | |
| Requesting the return of tungsten contact points from an old distributor on car 14-EX for an experiment. | 12th Dec 1927 | Box 35 \ 6 scan 382 | |
| Test results of a contact breaker unit with different thickness anvils and requesting a new test. | 12th Dec 1927 | Box 35 \ 6 scan 383 | |
| Test results for ignition contact points, focusing on scrubbing action and anvil thickness. | 12th Dec 1927 | Box 35 \ 6 scan 384 | |
| The ongoing tests of different scrubbing arm combinations. | 21th Dec 1927 | Box 35 \ 6 scan 385 | |
| Requesting further modification to three contact breaker levers already fitted with tungsten points. | 21th Dec 1927 | Box 35 \ 6 scan 386 | |
| Standardisation of a battery ignition contact breaker with a new spring design for reduced stress. | 14th Nov 1927 | Box 35 \ 6 scan 387 | |
| Form for the standardisation of chassis parts. | 14th Nov 1923 | Box 35 \ 6 scan 388 | |
| Test results for three different ignition contact points, highlighting issues with riveting tungsten points. | 23th Dec 1927 | Box 35 \ 6 scan 389 | |
| Test report on a 10% gold and 90% silver alloy used for cutout contact points. | 23th Dec 1927 | Box 35 \ 6 scan 390 | |
| Experiments with tungsten ignition contact points, testing various feature combinations. | 14th Jan 1928 | Box 35 \ 6 scan 391 | |
| Test conclusions on ignition distributor components, including break cams and scrubbing action. | 14th Jan 1928 | Box 35 \ 6 scan 392 | |
| The results of tests on ignition system components, including tungsten points, condensers, and various coils, with plans for further experimental work. | 22th Nov 1927 | Box 35 \ 6 scan 393 | |
| List of four indicated items related to a mechanism. | 14th Jan 1928 | Box 35 \ 6 scan 394 | |
| Declining the replacement of platinum iridium points with tungsten points due to necessary modifications and testing. | 14th Jan 1928 | Box 35 \ 6 scan 395 | |
| Results of a 10,000-mile bench test on tungsten contact points. | 7th Feb 1928 | Box 35 \ 6 scan 396 | |
| Suppliers of Tungsten Contact Points and seeking an opinion on their quality compared to a new supplier. | 25th Feb 1928 | Box 35 \ 6 scan 397 | |
| Purity and testing of tungsten contact points for a secondary supplier. | 27th Feb 1928 | Box 35 \ 6 scan 398 | |
| Recommended and tested spring loads for a contact breaker. | 5th Mar 1928 | Box 35 \ 6 scan 399 | |
| Letter from The L.P.S. Electrical Co. Ltd. regarding an order for three pairs of contacts and suggesting a standard alternative. | 6th Mar 1928 | Box 35 \ 6 scan 400 | |
| Tungsten contact points and samples from suppliers. | 15th Mar 1928 | Box 35 \ 6 scan 401 | |
| Letter regarding the dispatch of Tungsten contact points, including screws, levers, and riveting instructions. | 16th Mar 1928 | Box 35 \ 6 scan 402 | |
| The electrical ignition fittings for a 15-EX Phantom Chassis with a sports body after 9000 miles. | 7th Mar 1928 | Box 35 \ 6 scan 403 | |
| The experimental testing of battery ignition contact breaker levers and the correct method for fitting tungsten points. | 21th Mar 1928 | Box 35 \ 6 scan 404 | |
| Experimental fitting of tungsten tipped ignition points sent from an external company. | 21th Mar 1928 | Box 35 \ 6 scan 405 | |
| On the failure of make & break levers due to loose tungsten points and the subsequent plan for testing new parts. | 3rd Apr 1928 | Box 35 \ 6 scan 406 | |
| Urgent memorandum regarding production difficulties with riveting tungsten points. | 11th Apr 1928 | Box 35 \ 6 scan 407 | |
| Procurement of tungsten points and associated components for testing rigs. | 11th Apr 1928 | Box 35 \ 6 scan 408 | |
| Make & Break Levers for the 'Phantom' and 20-HP chassis models. | 12th Apr 1928 | Box 35 \ 6 scan 409 | |
| Letter from a supplier discussing issues with loose rivets in contact fingers and proposing a new fixing method. | 5th Apr 1928 | Box 35 \ 6 scan 410 | |
| Electrical experimental record sheet for testing tungsten points, tracking mileage and maintenance. | 19th Apr 1926 | Box 35 \ 6 scan 411 | |
| Typed memo arranging for the handover of levers for testing. | 11th Apr 1928 | Box 35 \ 6 scan 412 | |
| Instructions to E.F.C regarding the testing of 10 contact levers fitted with rubbing blocks. | 12th Apr 1928 | Box 35 \ 6 scan 413 | |
| Proposing the removal of a file from the tool kit due to the introduction of tungsten make and break contact points. | 13th Apr 1928 | Box 35 \ 6 scan 414 | |
| Supplier issues with make and break levers for the 20 HP & Phantom models. | 14th Apr 1928 | Box 35 \ 6 scan 415 | |
| The 'Make and Break' levers for the 20 HP and Phantom models. | 16th Apr 1928 | Box 35 \ 6 scan 416 | |
| Recommendation for the maintenance of make and break contact points. | 16th Apr 1928 | Box 35 \ 6 scan 417 | |
| Design modification to the ignition distributor spring to increase contact point pressure. | 19th Apr 1928 | Box 35 \ 6 scan 418 | |
| Specific L.P.S. tungsten points. | 23th Apr 1928 | Box 35 \ 6 scan 419 | |
| The handover of a battery ignition distributor and a quicker break cam for chassis 9-EX. | 2nd May 1928 | Box 35 \ 6 scan 420 | |
| Failure of tungsten contact points in battery ignition systems, exploring causes and detailing ongoing experiments with new designs and suppliers. | 4th May 1928 | Box 35 \ 6 scan 421 | |
| Extract from a letter concerning tungsten points and misfiring issues. | 15th May 1928 | Box 35 \ 6 scan 422 | |
| Testing and failure of battery ignition contact breaker levers with tungsten points. | 15th May 1928 | Box 35 \ 6 scan 423 | |
| Instruction sheet detailing an investigation into failures of tungsten contact points for battery ignition systems. | 15th May 1928 | Box 35 \ 6 scan 424 | |
| 100-hour bench test of distributor levers, noting a rivet failure and proposing soldering as an improvement. | 17th May 1928 | Box 35 \ 6 scan 425 | |
| Requesting the fitting of spring anchor pins to battery ignition contact breaker levers. | 17th May 1928 | Box 35 \ 6 scan 426 | |
| Testing and potential order for new ignition contact points. | 21th May 1928 | Box 35 \ 6 scan 427 | |
| Levers received from Mr. Brock and the decision not to send them for inspection. | 21th Jun 1928 | Box 35 \ 6 scan 428 | |
| Test report on specially riveted tungsten contact rivets for battery ignition levers. | 21th Jun 1928 | Box 35 \ 6 scan 429 | |
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