| Description | Date | Identifier | |
| Magneto ranges and the tabulation of bench test results. | 21th Mar 1921 | Box 4 \ 5 05-page148 | |
| Sourcing and quality of B.T.H., Apollo, and American Bosch magnetos in the U.S.A. | 23th Mar 1921 | Box 4 \ 5 05-page149 | |
| Table of lowest speeds in RPM for various Watford magnetos for regular firing on 0.5mm gaps in air. | 22th Mar 1921 | Box 4 \ 5 05-page150 | |
| Comparison table of various magnetos, detailing their types, numbers, lowest speeds, and performance remarks. | 25th Jul 1922 | Box 4 \ 5 05-page151 | |
| Table of lowest speeds in R.P.M. for regular firing on various magnetos with 5.5 mm gaps. | 25th Jul 1922 | Box 4 \ 5 05-page152 | |
| Table of results from magneto performance tests. | 23th Mar 1921 | Box 4 \ 5 05-page153 | |
| Comparison table of magneto performance and timing specifications for various makes. | 23th Mar 1921 | Box 4 \ 5 05-page154 | |
| Comparative table of test results for various magneto models. | 24th Jun 1921 | Box 4 \ 5 05-page155 | |
| Table of magneto distributor dimensions, make ratios, and ignition pitch values for different magneto types. | 24th Jun 1921 | Box 4 \ 5 05-page156 | |
| Table of results from magneto performance tests. | 19th Jul 1922 | Box 4 \ 5 05-page157 | |
| Comparative table of performance data for various magnetos. | 7th Nov 1923 | Box 4 \ 5 05-page158 | |
| Specification table detailing the electrical properties of various magnetos. | 24th Jun 1921 | Box 4 \ 5 05-page159 | |
| Table of magneto distributor dimensions, make ratios, and ranges for various types. | 24th Jun 1921 | Box 4 \ 5 05-page160 | |
| Sourcing of magnetos, specifying preferred suppliers. | 24th Mar 1921 | Box 4 \ 5 05-page161 | |
| Performance curves and testing results for three different magnetos. | 31th Mar 1921 | Box 4 \ 5 05-page162 | |
| Comparison of various magneto types, focusing on design peculiarities and low sparking speed performance. | 31th Mar 1921 | Box 4 \ 5 05-page163 | |
| Table detailing the lowest speeds in RPM for regular firing of various magnetos on 5.5mm gaps in air. | 22th Mar 1921 | Box 4 \ 5 05-page164 | |
| Comparison table of performance data, specifically lowest speeds, for different models of magnetos. | 1st Dec 1920 | Box 4 \ 5 05-page165 | |
| Table detailing the performance results of various magneto models. | 23th Mar 1921 | Box 4 \ 5 05-page166 | |
| Comparative table of test results for various magneto models, detailing break points and performance speeds. | 23th Mar 1921 | Box 4 \ 5 05-page167 | |
| Comparison table of technical data for various types of magnetos. | 22th May 1921 | Box 4 \ 5 05-page168 | |
| Graph of open circuit volt-speed and short circuit ampere-speed curves for the primary windings of Dixie, B.T.H., and Conner magnetos. | 22th May 1921 | Box 4 \ 5 05-page169 | |
| List of all magnetos detailing their type, number, and test status. | 31th Mar 1921 | Box 4 \ 5 05-page170 | |
| Continued list of available components by number, type, and status. | 31th Mar 1921 | Box 4 \ 5 05-page171 | |
| List of points raised by Mr. Royce regarding electrical systems following Mr. Clark's visit to West Wittering. | 31th Mar 1921 | Box 4 \ 5 05-page172 | |
| Dynamo specifications, suppliers, and design modifications, including diagrams. | 1st Mar 1921 | Box 4 \ 5 05-page173 | |
| Notes on dynamo windings, ignition coils, and comparisons of various magnetos. | 31th Mar 1921 | Box 4 \ 5 05-page174 | |
| Technical memorandum discussing issues with Watford magnetos, comparing their performance and weight to Bosch and Conner models. | 8th Apr 1921 | Box 4 \ 5 05-page175 | |
| Technical comparison of various magneto brands and their performance characteristics. | 9th Apr 1921 | Box 4 \ 5 05-page176 | |
| Comparing the prices and weights of various magnetos. | 11th Apr 1921 | Box 4 \ 5 05-page177 | |
| Previous note on general magneto topics. | 11th Apr 1921 | Box 4 \ 5 05-page178 | |
| Failure of U.S.A. Bosch magnetos and the advantages of a sleeve type magneto. | 11th Apr 1921 | Box 4 \ 5 05-page179 | |
| Potential design improvements for magnetos, specifically regarding laminated components and efficiency. | 12th Apr 1921 | Box 4 \ 5 05-page180 | |
| Letter arranging a visit to the Watford Company to discuss machine requirements and travel logistics. | 12th Apr 1921 | Box 4 \ 5 05-page181 | |
| Magnetos received from the U.S.A, their testing, and potential return. | 14th Apr 1921 | Box 4 \ 5 05-page182 | |
| Bench test results for the Eisemann Magneto Type G.N.6. | 14th Apr 1921 | Box 4 \ 5 05-page183 | |
| From EPC to E enquiring about a paper on magnetos by Mr. Watson. | 19th Apr 1921 | Box 4 \ 5 05-page184 | |
| Replying to a query about Magnetos X430, referencing a paper by Watson. | 23th Apr 1921 | Box 4 \ 5 05-page185 | |
| Magneto performance issues, particularly addressing sooted Lodge plugs and the low-speed firing of Watford magnetos. | 21th Apr 1921 | Box 4 \ 5 05-page186 | |
| Tests carried out to determine magneto requirements for the 40/50 engine, focusing on spark plug polarity. | 5th May 1921 | Box 4 \ 5 05-page187 | |
| Test report on magneto performance, comparing spark gap characteristics between Bosch and Watford models. | 1st May 1921 | Box 4 \ 5 05-page188 | |
| Tests measuring sparking plug resistance under various engine running conditions and fuel mixtures. | 5th May 1921 | Box 4 \ 5 05-page189 | |
| Engine slow running issues related to spark plug gaps and magneto performance. | 5th May 1921 | Box 4 \ 5 05-page190 | |
| Magneto ignition troubleshooting, focusing on spark plug gaps, voltage, and their effect on engine performance. | 1st May 1921 | Box 4 \ 5 05-page191 | |
| Engine misfiring issues with weak fuel mixtures and recommendations for magneto improvements. | 1st May 1921 | Box 4 \ 5 05-page192 | |
| Misfiring issues, recommending specific magnetos and discussing tests on different spark plugs and ignition coils. | 1st May 1921 | Box 4 \ 5 05-page193 | |
| Letter to The M.L. Magneto Synd. Ltd. requesting information on a paper about magnetos. | 6th May 1921 | Box 4 \ 5 05-page194 | |
| Letter from The M-L Magneto Synd. Ltd. enclosing a draft copy of Mr. Watson's Paper. | 7th May 1921 | Box 4 \ 5 05-page195 | |
| Magneto requirements, spark energy, and spark plug gap length for a 40/50 HP chassis. | 10th May 1921 | Box 4 \ 5 05-page196 | |
| Engine misfiring causes, including magneto issues, spark plug oxidisation, and carburation problems. | 10th May 1921 | Box 4 \ 5 05-page197 | |
| Magneto ignition requirements and related engine firing issues on 40/50 HP cars. | 12th May 1921 | Box 4 \ 5 05-page198 | |
| Spark plug positioning, magnetos, and recommendations for specific plug types to improve engine running. | 10th Aug 1921 | Box 4 \ 5 05-page199 | |
| Faults with the Watford magneto and the adoption of a new sleeve-type magneto. | 10th Aug 1921 | Box 4 \ 5 05-page200 | |
| Cover letter sending reports and remarks concerning U.S.A. Bosch Magnetos. | 17th Jun 1921 | Box 4 \ 5 05-page201 | |
| Correspondence from America concerning U.S.A. Bosch magnetos. | 9th Jan 1921 | Box 4 \ 5 05-page202 | |
| Component failures and analysis, discussing issues with fibre bushes, magnets, and a returned H.T. pencil. | 4th May 1921 | Box 4 \ 5 05-page203 | |
| Investigation into the low-speed sparking performance of Z.R.6 magnetos and discussions with the manufacturer, American Bosch. | 4th May 1921 | Box 4 \ 5 05-page204 | |
| Magneto drive modifications from belt to chain and awaiting the arrival of Ed-19 for further testing. | 24th Jun 1921 | Box 4 \ 5 05-page205 | |
| Table of magneto distributor dimensions, make ratios, and ranges, expressed in fractional values of the distributor pitch. | 24th Jun 1921 | Box 4 \ 5 05-page206 | |
| The utility test of a slate slab for ignition system leakage. | 2nd Jun 1922 | Box 4 \ 5 05-page207 | |
| Extract from a report on a regular spark gap test with leakage resistance. | 9th Jun 1921 | Box 4 \ 5 05-page208 | |
| Instruction sheet containing a table of magneto distributor dimensions. | 9th Jun 1921 | Box 4 \ 5 05-page209 | |
| Instruction sheet containing a table of make ratios and distribution sums for various magneto types. | 17th Jun 1921 | Box 4 \ 5 05-page210 | |
| Test report on a slate leak for utility, examining its resistance and performance with ignition systems. | 14th Nov 1921 | Box 4 \ 5 05-page211 | |
| Continued page discussing comparative utility tests for battery and magneto ignition systems. | 14th Jul 1921 | Box 4 \ 5 05-page212 | |
| Offer from Ercole Marelli & Co. Ltd. to demonstrate their latest magnetos. | 14th Jul 1921 | Box 4 \ 5 05-page213 | |
| Letter from Ercole Marelli & Co Ltd regarding a new type of Magneto. | 13th Jul 1921 | Box 4 \ 5 05-page214 | |
| Letter discussing ignition issues and a proposed solution using a dual magneto and battery system with a Delco switch. | 4th Aug 1921 | Box 4 \ 5 05-page215 | |
| Replacement of fibre bushes with Bakelite-micarta bushes in magnetos. | 16th Sep 1921 | Box 4 \ 5 05-page216 | |
| Recommendation to obtain and fit Bakelite-micarta bushes to magnetos, suggesting cabling Springfield for a supply. | 16th Sep 1921 | Box 4 \ 5 05-page217 | |
| Description of the general characteristics of a new type of magneto called the Magnetobloc. | 12th Oct 1921 | Box 4 \ 5 05-page218 | |
| Description of an ignition magneto, covering its armature, break device, and safety gap features. | 12th Oct 1921 | Box 4 \ 5 05-page219 | |
| Description of the ignition switch and 'Magnetobloc' component of a magneto. | 24th Jun 1921 | Box 4 \ 5 05-page220 | |
| Table of magneto distributor dimensions, make ratios, and ranges expressed in practical values. | 24th Jun 1921 | Box 4 \ 5 05-page221 | |
| Comparison of the lowest sparking speeds between a magneto belt and a chain drive. | 1st Nov 1921 | Box 4 \ 5 05-page222 | |
| Test report on the effect of High Tension (H.T.) lead length on magneto sparking. | 5th Nov 1921 | Box 4 \ 5 05-page223 | |
| Instruction sheet detailing test results of engine RPMs with varying H.T. cable lengths. | 3rd Nov 1921 | Box 4 \ 5 05-page224 | |
| Instructions detailing further tests on the effect of H.T. lead length on magneto sparks. | 2nd Dec 1921 | Box 4 \ 5 05-page225 | |
| Instruction sheet detailing RPM values for various cable lengths and electrical configurations. | 2nd Dec 1921 | Box 4 \ 5 05-page226 | |
| Table of results from magneto performance tests. | 19th Jul 1922 | Box 4 \ 5 05-page227 | |
| Comparison table of magneto performance data, including spark timing and operating speeds. | 19th Jul 1922 | Box 4 \ 5 05-page228 | |
| Technical data table detailing primary and secondary resistance and secondary milliamps for various magneto models. | 20th Dec 1921 | Box 4 \ 5 05-page229 | |
| Letter from Ercole Marelli & Co Ltd following up on a previous conversation regarding an offer for magnetos. | 20th Dec 1921 | Box 4 \ 5 05-page230 | |
| Product leaflet for the Marelli Magneto Type MP4 'Monoblock' with dimensional diagrams. | 9th May 1921 | Box 4 \ 5 05-page231 | |
| Product specification sheet for the Marelli Magneto Type M.P. Monoblock. | 9th May 1921 | Box 4 \ 5 05-page232 | |
| Price list and general instruction manual for Marelli Magnetos. | 9th May 1921 | Box 4 \ 5 05-page233 | |
| Specification sheet with dimensional drawings and data for various Marelli Magneto models. | 9th May 1921 | Box 4 \ 5 05-page234 | |
| Specification sheet for Marelli Magnetos for single and twin cylinder engines. | 1st Nov 1920 | Box 4 \ 5 05-page235 | |
| Product specification sheet for Marelli Magnetos for 4, 6, 8, and 12 cylinder engines. | 1st Nov 1920 | Box 4 \ 5 05-page236 | |
| Sales letter from The Salmson Magneto Company regarding their motor car magnetos and an enclosed catalogue. | 27th Feb 1922 | Box 4 \ 5 05-page237 | |
| Letter from Ercole Marelli & Co Ltd regarding the availability and sale of 'Marelli' Magnetos. | 1st Mar 1922 | Box 4 \ 5 05-page238 | |
| Assessment of the Delage car's ignition system, comparing magnetos with battery ignition. | 26th Jun 1922 | Box 4 \ 5 05-page239 | |
| Table detailing the lowest speeds in RPM for regular firing of various magnetos. | 25th Jul 1922 | Box 4 \ 5 05-page240 | |
| Comparison table of different magneto models detailing their lowest operational speeds and performance remarks. | 31th Jan 1918 | Box 4 \ 5 05-page241 | |
| Table detailing the lowest speeds in RPM for regular firing of various magnetos. | 22th Mar 1921 | Box 4 \ 5 05-page242 | |
| Promotional letter from The Salmson Magneto Company regarding their motor car magnetos. | 9th Dec 1922 | Box 4 \ 5 05-page243 | |
| The trial of a standard test gap on magneto and coil ignition systems. | 8th Feb 1923 | Box 4 \ 5 05-page244 | |
| Continuation of a test report on the effects of an external gap on sparking for magnetos and coils. | 8th Mar 1923 | Box 4 \ 5 05-page245 | |
| Tests investigating the effect of temperature on the conductance of a chemical leak for a standard gap. | 8th Mar 1923 | Box 4 \ 5 05-page246 | |
| The conductance of a chemical leak at various temperatures. | 14th Mar 1923 | Box 4 \ 5 05-page247 | |
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