| Description | Date | Identifier | |
| Investigation and test results of failing 20-HP ignition coils from various chassis. | 17th Aug 1923 | Box 45 \ 4 Scan189 | |
| Specification table for various types of coil primary windings. | 17th Aug 1923 | Box 45 \ 4 Scan190 | |
| Requesting the creation of new ignition coil temperature indicating sentinels with a higher melting point. | 21th Aug 1923 | Box 45 \ 4 Scan191 | |
| Summary of experiments and fault finding on three ignition coils. | 31th Aug 1923 | Box 45 \ 4 Scan192 | |
| Worksheet detailing the testing and failure analysis of electrical coils. | 6th Nov 1918 | Box 45 \ 4 Scan193 | |
| Insufficient socket depth for the H.T. wire on the ignition coil moulding, recommending an increase. | 29th Aug 1923 | Box 45 \ 4 Scan194 | |
| List of standard temperatures for sentinels in degrees Celsius. | 3rd Sep 1923 | Box 45 \ 4 Scan195 | |
| Comparing the sparking performance of ignition coils in cases of various materials. | 3rd Sep 1923 | Box 45 \ 4 Scan196 | |
| Temperature tests of ignition coils housed in cases made from various materials. | 1st Sep 1923 | Box 45 \ 4 Scan197 | |
| Test report on a coil connected to six graduated spark gaps, recording performance during a heating-up process. | 1st Sep 1923 | Box 45 \ 4 Scan198 | |
| Test report comparing the maximum regular sparking gap of various insulated coils during a heating-up process. | 4th Sep 1923 | Box 45 \ 4 Scan199 | |
| The temperatures of dynamo, ignition coil, and condenser units using fusible metal sentinels. | 4th Sep 1923 | Box 45 \ 4 Scan200 | |
| Query regarding the testing conditions for ignition coils at varying temperatures under compression. | 5th Sep 1923 | Box 45 \ 4 Scan201 | |
| Responding to a query about temperature tests of coils housed in cases of various materials. | 9th Sep 1923 | Box 45 \ 4 Scan202 | |
| Temperature tests of coils and the electrical stress on primary and secondary windings. | 7th Sep 1923 | Box 45 \ 4 Scan203 | |
| Temperature tests of coils, discussing spark-over E.M.F., distributor discharge, and winding breakdowns. | 8th Sep 1923 | Box 45 \ 4 Scan204 | |
| List detailing the status and type of coils on various chassis. | 19th Sep 1923 | Box 45 \ 4 Scan205 | |
| Melted 77°C sentinels for ignition coils on various GII models. | 22th Sep 1923 | Box 45 \ 4 Scan206 | |
| Test results log for Goshawk ignition coils. | 26th Oct 1923 | Box 45 \ 4 Scan207 | |
| From E.J. Brock to Mr. Clark regarding a GII coil used for testing rotors. | 17th Oct 1923 | Box 45 \ 4 Scan208 | |
| Historical and new suggestions for coil design, materials, and manufacturing. | 12th Nov 1923 | Box 45 \ 4 Scan209 | |
| Use of bakelite for ignition coil cases following struggles and failures with the material. | 14th Nov 1923 | Box 45 \ 4 Scan210 | |
| The material and design of coil cases for 20HP and 40/50 models. | 14th Nov 1923 | Box 45 \ 4 Scan211 | |
| Modification of moulds for longer coils and a new design for E.A.C.11. | 14th Nov 1923 | Box 45 \ 4 Scan212 | |
| List detailing coil configurations, materials, and winding specifications for various chassis models. | 3rd Dec 1923 | Box 45 \ 4 Scan213 | |
| List cross-referencing Chassis types with their corresponding Coil types. | 3rd Dec 1923 | Box 45 \ 4 Scan214 | |
| Comparative testing of a new Redmanol encased ignition coil. | 18th Dec 1923 | Box 45 \ 4 Scan215 | |
| Experimental use of Redmanol cases for taller type ignition coils. | 9th Jan 1924 | Box 45 \ 4 Scan216 | |
| Test results log for Goshawk Ignition Coils, detailing continuity, milliamps, and current measurements. | 11th Jan 1924 | Box 45 \ 4 Scan217 | |
| Service and performance record for a tall coil, model LG1. | 27th Mar 1923 | Box 45 \ 4 Scan218 | |
| Service and test record log for tall coil number LG2. | 27th Mar 1923 | Box 45 \ 4 Scan219 | |
| Service and testing log for a tall ignition coil, number T.G.I. | 27th Mar 1923 | Box 45 \ 4 Scan220 | |
| Service and test record for ignition coil TG2. | 17th Aug 1923 | Box 45 \ 4 Scan221 | |
| Test and service record for a specific Tall Coil, detailing its mileage, usage, and performance remarks. | 27th Mar 1923 | Box 45 \ 4 Scan222 | |
| Record card tracking the testing and service history of a tall coil. | 27th Mar 1923 | Box 45 \ 4 Scan223 | |
| Record of tests, modifications, and performance for a specific tall coil. | 17th Jan 1924 | Box 45 \ 4 Scan224 | |
| Service and performance record log for a tall coil, part number 5TG3. | 17th Jan 1924 | Box 45 \ 4 Scan225 | |
| List specifying the materials and turn counts for coils used on various chassis models. | 23th Jan 1924 | Box 45 \ 4 Scan226 | |
| Typed list correlating chassis numbers with their corresponding coil types. | 3rd Mar 1924 | Box 45 \ 4 Scan227 | |
| Internal request for the production of two more Coil Cases in Redmonal. | 1st Feb 1924 | Box 45 \ 4 Scan228 | |
| The comparative testing of Redmanol and ebonite coils, advising against their immediate standardisation. | 2nd Feb 1924 | Box 45 \ 4 Scan229 | |
| Internal instruction memo regarding the testing of two 'Tall Boy' Coils in Redmanol cases, and a follow-up on a previous test. | 6th Feb 1924 | Box 45 \ 4 Scan230 | |
| Table of particulars for the resistances and inductances of primary and secondary Goshawk ignition coils. | 1st Mar 1924 | Box 45 \ 4 Scan231 | |
| Test results for Goshawk ignition coils, detailing continuity, current, and resistance measurements. | 3rd Jun 1924 | Box 45 \ 4 Scan232 | |
| Requesting outstanding thrashing test reports for Tall Redmanol Encased Coils. | 25th Mar 1924 | Box 45 \ 4 Scan233 | |
| Ignition coil tests performed on chassis 7-GII. | 8th Apr 1924 | Box 45 \ 4 Scan234 | |
| Comparative bench tests for various Goshawk ignition coils. | 10th Apr 1924 | Box 45 \ 4 Scan235 | |
| Requesting the receipt of a redmanol encased coil and reports on the operation of various Goshawk ignition coils. | 23th Apr 1924 | Box 45 \ 4 Scan236 | |
| Extract detailing the discovery of a defective bakelite ignition coil causing issues when the engine gets hot. | 29th May 1924 | Box 45 \ 4 Scan237 | |
| Expressing caution about using bakelite for a coil case and recommending careful experiments. | 29th May 1924 | Box 45 \ 4 Scan238 | |
| Testing of Redmanol encased coils and arranging further trials on experimental cars. | 31th May 1924 | Box 45 \ 4 Scan239 | |
| Request to produce three experimental ignition coils with cases made from Redmanol. | 3rd Jun 1924 | Box 45 \ 4 Scan240 | |
| Experimental testing of new taller Redmanol encased coils against the standard Stabalite coils. | 3rd Jun 1924 | Box 45 \ 4 Scan241 | |
| Continued note comparing a mouldensite encased coil with a tall type redmanol coil, noting differences in the primary winding. | 3rd Jun 1924 | Box 45 \ 4 Scan242 | |
| Testing and comparison of redmanol, stabalite, and bakelite encased ignition coils. | 5th Jun 1924 | Box 45 \ 4 Scan243 | |
| Internal instruction memo regarding the provision of three Tall Toy coils in Redmanol bases. | 6th Jun 1924 | Box 45 \ 4 Scan244 | |
| The dispatch of an up-to-date battery ignition coil in a moulded redmanol case for testing. | 18th Jun 1924 | Box 45 \ 4 Scan245 | |
| Requesting an exchange of ignition coils to perform comparative bench temperature tests. | 18th Jun 1924 | Box 45 \ 4 Scan246 | |
| The despatch of an up-to-date ignition coil in a Redmanol case to Mr. Royce. | 18th Jun 1924 | Box 45 \ 4 Scan247 | |
| List detailing coil specifications for various chassis, including materials, tests and number of turns. | 19th Jun 1924 | Box 45 \ 4 Scan248 | |
| List detailing the type of coil fitted to various chassis models. | 19th Jun 1924 | Box 45 \ 4 Scan249 | |
| Requesting the replacement of a stabalite ignition coil with a Redmanol coil on an experimental car. | 4th Jul 1924 | Box 45 \ 4 Scan250 | |
| Status report on the mileage of Tall Permanol coils on various test chassis. | 9th Jul 1924 | Box 45 \ 4 Scan251 | |
| Temperature tests conducted on coils encased in Stabalite and Elo materials. | 14th Jul 1924 | Box 45 \ 4 Scan252 | |
| Temperature tests of standard tall coils in stabalite and redmanol cases. | 14th Jul 1924 | Box 45 \ 4 Scan253 | |
| Test results for ignition coils at various temperatures, detailing maximum regular sparking gap. | 14th Jul 1924 | Box 45 \ 4 Scan254 | |
| Page 3 of a report comparing the performance of different coils at various temperatures, with a recommendation for further testing. | 15th Jul 1924 | Box 45 \ 4 Scan255 | |
| Requesting the results of comparative thrashing tests on tall redmanol and stabalite encased coils. | 15th Jul 1924 | Box 45 \ 4 Scan256 | |
| Follow-up note regarding the completion of tests on Tall Redmanol Coils. | 13th Aug 1924 | Box 45 \ 4 Scan257 | |
| Record log detailing the service history and performance testing of coil number 3.TG3. | 19th Jul 1923 | Box 45 \ 4 Scan258 | |
| Comparative testing of ignition coils and the replacement of a coil on vehicle 7-GII. | 25th Sep 1924 | Box 45 \ 4 Scan259 | |
| Temperature test report on Heimanel encased tall coils TR1 and TR3. | 6th Oct 1924 | Box 45 \ 4 Scan260 | |
| The fitting of tall redmanol coils to experimental chassis. | 7th Oct 1924 | Box 45 \ 4 Scan261 | |
| The testing of tall battery ignition coils encased in Redmanol synthetic resin. | 14th Oct 1924 | Box 45 \ 4 Scan262 | |
| The laboratory and road testing of redmanol encased coils versus standard stabalite coils. | 14th Oct 1924 | Box 45 \ 4 Scan263 | |
| Testing and performance results of various ignition coils on different car chassis. | 14th Oct 1924 | Box 45 \ 4 Scan264 | |
| The comparative reliability and failure testing of different types of encased coils. | 14th Oct 1924 | Box 45 \ 4 Scan265 | |
| Temperature tests of standard tall coils in stabalite and redmanol cases. | 14th Jul 1924 | Box 45 \ 4 Scan266 | |
| Test report on various coils, detailing the maximum regular sparking gap at different oven temperatures. | 14th Jul 1924 | Box 45 \ 4 Scan267 | |
| The average current taken by various coils when hot, comparing redmanol and stabalite types. | 6th Oct 1924 | Box 45 \ 4 Scan268 | |
| Temperature test report on Reimanol encased tall coils nos. TR1 and TR3. | 6th Oct 1924 | Box 45 \ 4 Scan269 | |
| Temperature tests on coils encased in Stabalite and Elo materials. | 14th Jul 1924 | Box 45 \ 4 Scan270 | |
| Comparative ignition coil tests on chassis 7-GII. | 8th Apr 1924 | Box 45 \ 4 Scan271 | |
| Report on coils in Redmanol cases and a suggestion to produce mouldings in-house. | 11th Apr 1924 | Box 45 \ 4 Scan272 | |
| Copy of a letter discussing a report on coil cases, comparing Redmanol and Stabalite materials. | 29th Oct 1924 | Box 45 \ 4 Scan273 | |
| Potential unreliability of Redmanol coil cases. | 1st Nov 1924 | Box 45 \ 4 Scan274 | |
| The mileage test of a Redmanol encased coil on a 40/50 car. | 8th Jan 1925 | Box 45 \ 4 Scan275 | |
| Advising the experimental construction of an EAC coil with a Redmanol case due to the susceptibility of stabalite cases to cracking. | 24th Jan 1925 | Box 45 \ 4 Scan276 | |
| Mileage log for experimental tall coils, listing case materials and miles run on various chassis. | 26th Jan 1925 | Box 45 \ 4 Scan277 | |
| Test results for a Redmanol encased coil TR3 after endurance testing. | 29th Jan 1925 | Box 45 \ 4 Scan278 | |
| Graph showing curves of spark-lengths and current consumptions for coils G.B.S. and S.B.1. | 21th Dec 1933 | Box 45 \ 4 Scan279 | |
| Heavily faded document with a red ink stamp and a handwritten reference number. | 16th Feb 1925 | Box 45 \ 4 Scan280 | |
| Production test results for a Yall coil No TN2 in a 'Nestolite' case after rectification. | 25th Mar 1925 | Box 45 \ 4 Scan281 | |
| Request to exchange a TN1 Nestolite coil with a Redmanol encased coil between chassis 49-GB and 7-CII. | 30th Mar 1925 | Box 45 \ 4 Scan282 | |
| The mileage completed by Remanol Encased Tall Coils without reported failure. | 1st May 1925 | Box 45 \ 4 Scan283 | |
| Instructing the fitment of a Redmanol encased ignition coil TR3 to chassis GF68. | 1st May 1925 | Box 45 \ 4 Scan284 | |
| The mileage records and reliability of Redmanol encased battery ignition coils. | 4th May 1925 | Box 45 \ 4 Scan285 | |
| Requesting the exchange of a Remanol encased coil for a standard coil on a Goshawk chassis. | 4th May 1925 | Box 45 \ 4 Scan286 | |
| Experiments to reduce energy output in ignition coils, considering ballast resistance and finer windings. | 20th May 1925 | Box 45 \ 4 Scan287 | |
| Continued discussion on experimenting with the design of an iron core ignition coil. | 20th May 1925 | Box 45 \ 4 Scan288 | |
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