| Description | Date | Identifier | |
| The completion of jobs for contact breaker levers and machining tests on bone grey fibre. | 9th Jul 1924 | Box 69 \ 1 scan0341 | |
| Three sample Make and Break Cam Followers made from American Bone Grey Fibre, comparing them to the existing red fibre. | 13th Aug 1924 | Box 69 \ 1 scan0342 | |
| Wear test report on a bone grey fibre rubbing block, detailing a 10,000 mile equivalent run. | 15th Jul 1924 | Box 69 \ 1 scan0343 | |
| Material wear dimensions after a 10,000-mile test. | 9th Jul 1923 | Box 69 \ 1 scan0344 | |
| The unapproved transfer of a distributor breaker lever between vehicles and the resulting record-keeping issues. | 13th Aug 1924 | Box 69 \ 1 scan0345 | |
| Machining tests and material sources for bone grey fibre rubbing blocks for battery ignition. | 13th Aug 1924 | Box 69 \ 1 scan0346 | |
| Comparing the machining and wearing properties of two Bone Grey Fibre rubbing block samples. | 21th Aug 1924 | Box 69 \ 1 scan0347 | |
| Hygroscopic test comparing the moisture absorption of Bakelite and Bone grey fibre. | 23th Aug 1924 | Box 69 \ 1 scan0348 | |
| Comparison of water absorption by weight between Bakelite and Bone grey fibre after immersion. | 29th Jun 1920 | Box 69 \ 1 scan0349 | |
| Fitting experimental bone grey fibre rubbing blocks to cars 98-NK, 44-PK, or 5-EX. | 27th Aug 1924 | Box 69 \ 1 scan0350 | |
| Bone Grey Fibre Rubbing Block, part number X.4646. | 28th Aug 1924 | Box 69 \ 1 scan0351 | |
| Instruction sheet detailing the results of a wear test on an unlubricated rubbing block. | 21th Oct 1924 | Box 69 \ 1 scan0352 | |
| Investigation into material swelling due to its hygroscopic properties, confirmed by a heating test. | 29th Jun 1920 | Box 69 \ 1 scan0353 | |
| The supply of contact breaker levers and a new bone grey fibre material for rubbing blocks. | 21th Oct 1924 | Box 69 \ 1 scan0354 | |
| Fitting a second sample of bone grey fibre rubbing blocks to contact breaker levers. | 27th Oct 1924 | Box 69 \ 1 scan0355 | |
| The mileage tests of bone grey fibre rubbing blocks. | 28th Oct 1924 | Box 69 \ 1 scan0356 | |
| Instruction sheet detailing the wear results of a bone-grey fibre rubbing block after a road test. | 8th Dec 1924 | Box 69 \ 1 scan0357 | |
| 10,000-mile bench test of a contact breaker lever with a bone grey fibre rubbing block. | 15th Dec 1924 | Box 69 \ 1 scan0358 | |
| Inspection report detailing the unsatisfactory condition of platinum points and rust found inside a distributor after 5000 miles. | 29th Jun 1920 | Box 69 \ 1 scan0359 | |
| Instruction sheet detailing the wear test results for a bone grey fibre rubbing block after a 10,000-mile test. | 19th Dec 1924 | Box 69 \ 1 scan0360 | |
| Electrical experimental record sheet for a Bone Grey Fibre rubbing block test sample. | 12th Jun 1924 | Box 69 \ 1 scan0361 | |
| Electrical experimental record sheet for a bone grey fibre rubbing block. | 18th Jun 1924 | Box 69 \ 1 scan0362 | |
| Electrical experimental record sheet for a bone grey fibre rubbing block test. | 3rd Oct 1924 | Box 69 \ 1 scan0363 | |
| Electrical experimental record sheet for a bone grey fibre rubbing block. | 21th Oct 1924 | Box 69 \ 1 scan0364 | |
| Mileage report for bone grey fibre rubbing blocks on experimental cars. | 2nd Jan 1925 | Box 69 \ 1 scan0365 | |
| List of experimental ignition parts removed from chassis 93-NK before completing 10,000 miles. | 23th Feb 1925 | Box 69 \ 1 scan0366 | |
| Electrical experimental record sheet for a Bone Grey Fibre rubbing block test. | 18th Jun 1924 | Box 69 \ 1 scan0367 | |
| Electrical experimental record sheet for the testing of a bone grey fibre rubbing block. | 14th May 1924 | Box 69 \ 1 scan0368 | |
| Electrical experimental record sheet for a bone grey fibre rubbing block sample. | 14th May 1924 | Box 69 \ 1 scan0369 | |
| Electrical experimental record sheet for a bone grey fibre rubbing block sample. | 21th Oct 1924 | Box 69 \ 1 scan0370 | |
| 10,000-mile bench test report on a standard Goshawk distributor, examining a new rubbing block and platinum points. | 21th Oct 1924 | Box 69 \ 1 scan0371 | |
| Analysis and inspection of a deposit found on metal parts susceptible to oxidation. | 28th Apr 1925 | Box 69 \ 1 scan0372 | |
| 16,000-mile test in France for vehicle 93-NK, detailing electrical component wear. | 28th Apr 1925 | Box 69 \ 1 scan0373 | |
| The mileage performance of various samples of bone grey fibre rubbing blocks. | 18th May 1925 | Box 69 \ 1 scan0374 | |
| Chassis 93-NK after 15,447 miles in France, detailing issues with the magneto and battery ignition. | 20th May 1925 | Box 69 \ 1 scan0375 | |
| Requesting the fitting of bone grey fibre rubbing blocks and springs to contact breaker levers. | 3rd Jun 1925 | Box 69 \ 1 scan0376 | |
| Request for the return of a contact breaker lever for examination and standardisation purposes. | 12th Jun 1925 | Box 69 \ 1 scan0377 | |
| Letter sent from France confirming a bone grey fibre is being sent and that a screw with a burnt contact point has been lost. | 15th Jun 1925 | Box 69 \ 1 scan0378 | |
| The mileage and wear of an experimental bone grey fibre rubbing block and AS tungsten points. | 19th Jun 1925 | Box 69 \ 1 scan0379 | |
| The wear of a bone grey fibre rubbing block after testing on car 5EX. | 30th Jun 1925 | Box 69 \ 1 scan0380 | |
| Test report on a bone grey fibre rubbing block after 10,090 miles of use. | 17th Jun 1925 | Box 69 \ 1 scan0381 | |
| Test report on the wear of a bone grey fibre rubbing block after running over 1000 miles. | 17th Jun 1925 | Box 69 \ 1 scan0382 | |
| Test log for battery ignition rubbing blocks, detailing material, wear, and conditions. | 29th Dec 1924 | Box 69 \ 1 scan0383 | |
| Test report on battery ignition rubbing blocks. | 29th Dec 1924 | Box 69 \ 1 scan0384 | |
| The testing and supply reliability of bone grey fibre for rubbing blocks. | 1st Jul 1925 | Box 69 \ 1 scan0385 | |
| Cover letter forwarding information about bone grey fibre for rubbing blocks. | 1st Jul 1925 | Box 69 \ 1 scan0386 | |
| Letter from Diamond Fibre Co. Ltd. regarding the supply and pricing of 'Whalebone Fibre' for friction washers. | 20th Jun 1924 | Box 69 \ 1 scan0387 | |
| Tests of contact breaker rubbing block material, and in particular of Bone Grey Fibre. | 1st Jul 1925 | Box 69 \ 1 scan0388 | |
| The testing and comparison of bone grey fibre against continental bakelite, recommending its standardisation. | 15th Jul 1924 | Box 69 \ 1 scan0389 | |
| Hygroscopic and wear tests comparing bakelite and bone grey fibre. | 15th Jul 1924 | Box 69 \ 1 scan0390 | |
| Wear tests on continental bakelite and bone grey fibre components. | 1st Jul 1925 | Box 69 \ 1 scan0391 | |
| Test report detailing wear results for first and second samples of bone grey fibre. | 1st Jul 1925 | Box 69 \ 1 scan0392 | |
| Materials test report detailing wear on two samples of bone grey fibre. | 17th Jun 1925 | Box 69 \ 1 scan0393 | |
| Confirming the standardisation of a battery ignition contact breaker rubbing block for the 'Phanton' and 20 HP models. | 1st Aug 1925 | Box 69 \ 1 scan0394 | |
| Standardisation of the battery ignition contact breaker rubbing block of bone grey fibre. | 21th Jul 1925 | Box 69 \ 1 scan0395 | |
| Request to conduct machining tests on samples of bone grey fibre and bakelite block received from Spauldings Ltd. | 9th Oct 1925 | Box 69 \ 1 scan0396 | |
| Extract concerning Bakelite insulating materials and Bone Grey Fibre. | 2nd Nov 1925 | Box 69 \ 1 scan0397 | |
| Colour variation in bone grey fibre used for production and arranging for comparison samples. | 2nd Nov 1925 | Box 69 \ 1 scan0398 | |
| The replacement of contact breaker lever rubbing blocks with bone grey fibre. | 9th Apr 1926 | Box 69 \ 1 scan0399 | |
| Supply and modification of battery ignition contact breaker levers. | 15th May 1926 | Box 69 \ 1 scan0400 | |
| Replacement of Continental bakelite rubbing blocks with bone grey fibre rubbing blocks on three battery ignition contact breaker levers. | 8th Sep 1926 | Box 69 \ 1 scan0401 | |
| Test report on the wear characteristics of Spaulding's bone grey fibre material used for contact breaker lever rubbing blocks. | 24th Sep 1926 | Box 69 \ 1 scan0402 | |
| Instruction note rejecting 'Spaulding's' material for production due to excessive wear. | 29th Jun 1920 | Box 69 \ 1 scan0403 | |
| Electrical experimental record sheet for a contact breaker lever fitted with Spaulding's Fibre. | 24th Sep 1926 | Box 69 \ 1 scan0404 | |
| The inferior wearing qualities of bone grey fibre following a 10,000-mile test on a chassis in France. | 25th Sep 1926 | Box 69 \ 1 scan0405 | |
| Confirming the continued use of 'Whalebone' material for the contact breaker arm rubbing block. | 27th Sep 1926 | Box 69 \ 1 scan0406 | |
| Request to fit six battery ignition contact breaker levers with bone grey fibre rubbing blocks. | 4th Nov 1926 | Box 69 \ 1 scan0407 | |
| The fitting of bone grey fibre rubbing blocks to contact breaker levers. | 25th Nov 1926 | Box 69 \ 1 scan0408 | |
| Request for a sample of bone grey fibre for use in contact breakers and for third-party testing. | 3rd Dec 1926 | Box 69 \ 1 scan0409 | |
| The performance of bone grey fibre for battery ignition rubbing blocks, with a sample provided for comparison. | 4th Dec 1926 | Box 69 \ 1 scan0410 | |
| Sample of Whale Bone Grey Fibre for material trial. | 20th Dec 1926 | Box 69 \ 1 scan0411 | |
| Comparison of two samples of bone grey fibre and suggesting a Brinnell test. | 21th Dec 1926 | Box 69 \ 1 scan0412 | |
| Comparison of scleroscope hardness tests on experimental and standard grey fibre samples. | 4th Jan 1927 | Box 69 \ 1 scan0413 | |
| Request to fit six standard tungsten contact breaker levers with rubbing blocks of bone grey fibre. | 14th Jun 1927 | Box 69 \ 1 scan0414 | |
| Inquiring about the consistency of bone grey fibre used for battery ignition contact breaker rubbing blocks. | 7th Jun 1930 | Box 69 \ 1 scan0415 | |
| Confirming the quality and source of bone grey fibre for battery ignition contact breaker rubbing blocks. | 18th Jun 1930 | Box 69 \ 1 scan0416 | |
| Improvements to ignition coil No.L.I.5 for fitting to 23-EX. | 20th Jan 1930 | Box 69 \ 2 scan0001 | |
| The fitting of a modified ignition coil to chassis 16-G4. | 5th Apr 1930 | Box 69 \ 2 scan0002 | |
| Production test procedure for an ignition coil, detailing tests for continuity, short circuits, and high tension. | 5th Apr 1930 | Box 69 \ 2 scan0003 | |
| Test procedures for ignition system components, detailing voltage, current, and running conditions. | 7th Apr 1930 | Box 69 \ 2 scan0004 | |
| Cover note for the production test specification for an ignition coil. | 7th Apr 1930 | Box 69 \ 2 scan0005 | |
| Request to alter the lower current limit for an ignition coil production test. | 4th Apr 1930 | Box 69 \ 2 scan0006 | |
| Standardisation of an ignition coil of improved design. | 4th Apr 1930 | Box 69 \ 2 scan0007 | |
| List of five design improvements for an ignition coil. | 15th May 1930 | Box 69 \ 2 scan0008 | |
| The methodology for measuring layer voltage in a standard ignition coil with a tapped secondary winding. | 15th May 1930 | Box 69 \ 2 scan0009 | |
| Table of maximum voltage readings at different tapping points on a coil, with an accompanying analysis. | 22th May 1930 | Box 69 \ 2 scan0010 | |
| Failures and experiments related to ignition coil secondary windings. | 22th May 1930 | Box 69 \ 2 scan0011 | |
| Experiment on a standard coil's secondary terminal connection to prevent breakdown. | 22th May 1930 | Box 69 \ 2 scan0012 | |
| Extract from G.W. Hancock's report on vehicle 24-EX regarding the ignition coil at 6,000 miles. | 20th Jul 1930 | Box 69 \ 2 scan0013 | |
| Electrical experimental record sheet for an ignition coil test. | 28th Jan 1930 | Box 69 \ 2 scan0014 | |
| Extract from G.W. Hancock's report on an ignition coil test on vehicle 24-EX at 10,000 miles. | 15th Aug 1930 | Box 69 \ 2 scan0015 | |
| Comparative laboratory tests of enamelled copper wire for ignition coil secondary windings. | 7th Sep 1930 | Box 69 \ 2 scan0016 | |
| Page 2 of a report detailing chemical, abrasion, tensile, and heat tests on various enameled wire samples. | 7th Sep 1930 | Box 69 \ 2 scan0017 | |
| Results of an electrical breakdown test on various grades of wire, with a recommendation for future use. | 18th Sep 1930 | Box 69 \ 2 scan0018 | |
| Specification of laboratory tests for enamelled copper wire for ignition coil secondary windings. | 18th Sep 1930 | Box 69 \ 2 scan0019 | |
| Comparison of different manufacturers of enamelled copper wire for ignition coil secondary windings. | 22th Sep 1930 | Box 69 \ 2 scan0020 | |
| Requesting a comparison between insulating paper waxed before winding versus paper waxed after being wound into an ignition coil. | 24th Sep 1930 | Box 69 \ 2 scan0021 | |
| The test results of various ignition coil insulating papers. | 10th Oct 1930 | Box 69 \ 2 scan0022 | |
| Conductance test results for different types of wax paper at varying temperatures. | 10th Oct 1930 | Box 69 \ 2 scan0023 | |
| Continuation of a report comparing the properties of different types of paper for coil impregnation. | 1st Oct 1930 | Box 69 \ 2 scan0024 | |
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