| Description | Date | Identifier | |
| Failure of fibre bushes in Bosch magneto contact breakers during a 10,000-mile engine bench test. | 27th Aug 1914 | Box 4 \ 5 05-page048 | |
| Challenges and methods for creating sufficiently strong permanent magnets for magnetos. | 21th Sep 1914 | Box 4 \ 5 05-page049 | |
| Methods for magnetizing and testing magnets, with specific reference to experiments on Bosch magnets. | 21th Sep 1914 | Box 4 \ 5 05-page050 | |
| The properties and hardening of steel for magnetos, with a comparison to Bosch magnets. | 2nd Nov 1914 | Box 4 \ 5 05-page051 | |
| Achieving magnet permanency and comparing steel composition and hardness against a Bosch equivalent. | 20th May 1918 | Box 4 \ 5 05-page052 | |
| Returning a loaned book on the High-Tension Magneto and requesting a copy be obtained. | 20th May 1918 | Box 4 \ 5 05-page053 | |
| Design changes to the front flywheels, magneto, and air pump. | 18th Dec 1918 | Box 4 \ 5 05-page054 | |
| Requesting views on a cumbersome and seemingly impractical inductor scheme for magnetos. | 8th May 1919 | Box 4 \ 5 05-page055 | |
| Critique of a sleeve inductor type magneto design (Paynes Patent), comparing it to polar inductor types. | 9th May 1919 | Box 4 \ 5 05-page056 | |
| Continuation page of a specification document. | 9th May 1919 | Box 4 \ 5 05-page057 | |
| Letter from Splitdorf Electrical Co. following up on magnetos and distributors sent for testing. | 15th Jul 1919 | Box 4 \ 5 05-page058 | |
| List of various magnetos from different manufacturers awaiting testing. | 27th Apr 1920 | Box 4 \ 5 05-page059 | |
| Letter from The British Thomson-Houston Co. Ltd discussing magneto flux curves and voltage waves. | 20th May 1920 | Box 4 \ 5 05-page060 | |
| The concluding page of a letter from the Chief of the Engineering Department regarding achieving results at high speeds. | 20th Jul 1920 | Box 4 \ 5 05-page061 | |
| Preliminary report on the American Bosch Magneto ZR 6, comparing it to the German version. | 20th Jul 1920 | Box 4 \ 5 05-page062 | |
| Comparison of American ZR 6, German Bosch, and Watford magnetos regarding construction, noise, and reliability. | 20th Jul 1920 | Box 4 \ 5 05-page063 | |
| Comparative test report on Watford and American Bosch magnetos, including bench and road tests. | 20th Jul 1920 | Box 4 \ 5 05-page064 | |
| Investigation of magnetos, ignition, and sparking plugs. | 24th Jul 1920 | Box 4 \ 5 05-page065 | |
| Instruction sheet listing magnetos to be tested and compared against a standard Watford magneto. | 23th Aug 1920 | Box 4 \ 5 05-page066 | |
| Instruction sheet detailing the availability of various magnetos for order P.A.11. | 23th Aug 1920 | Box 4 \ 5 05-page067 | |
| Notes on the action of a revolving armature type magneto. | 6th Oct 1920 | Box 4 \ 5 05-page068 | |
| Two diagrams illustrating the principle of a rotating armature within a magnetic field. | 12th Aug 1936 | Box 4 \ 5 05-page069 | |
| Diagrams illustrating a rotating component within a housing and a typical speed-gap curve graph. | 12th Aug 1936 | Box 4 \ 5 05-page070 | |
| Page discussing the effects of hysteresis and eddy currents on an armature and pole pieces in a magnetic system. | 11th Aug 1929 | Box 4 \ 5 05-page071 | |
| Page explaining the effects of eddy-currents and flux changes in an armature core and pole pieces. | 11th Aug 1929 | Box 4 \ 5 05-page072 | |
| Theoretical analysis of magneto operation, discussing eddy current loss, flux, and primary coil windings. | 10th Jun 1920 | Box 4 \ 5 05-page073 | |
| Technical analysis of magneto primary current, considering electrical lag, ampere-turns, and eddy currents. | 10th Jun 1920 | Box 4 \ 5 05-page074 | |
| Page explaining armature core flux, current induction, and related electromagnetic principles at varying speeds. | 1st Nov 1930 | Box 4 \ 5 05-page075 | |
| Page discussing the principles of core flux, electromotive force, and primary current in an ignition system. | 1st Nov 1930 | Box 4 \ 5 05-page076 | |
| Technical explanation of magneto ignition timing, focusing on current at break and spark intensity. | 11th Apr 1923 | Box 4 \ 5 05-page077 | |
| Technical explanation of magneto operation regarding current, E.M.F., and spark intensity at different speeds and timings. | 13th Jun 1920 | Box 4 \ 5 05-page078 | |
| Continued explanation of primary current behaviour in relation to speed, magnetic flux, and eddy currents in an armature core. | 13th Jun 1920 | Box 4 \ 5 05-page079 | |
| Explanation of the electrical phenomena occurring in a circuit immediately after the point of break. | 13th Jun 1920 | Box 4 \ 5 05-page080 | |
| Explanation of discharge and flux redistribution in primary and secondary circuits following an interruption of current. | 13th Jun 1920 | Box 4 \ 5 05-page081 | |
| The use of a condenser to manage inductive discharge in primary and secondary windings. | 13th Jun 1920 | Box 4 \ 5 05-page082 | |
| Explanation of oscillatory current within a magneto's primary circuit, including the function of the condenser and safety gap. | 13th Jun 1920 | Box 4 \ 5 05-page083 | |
| Page describing the electrical phenomena of current oscillation in primary and secondary circuits. | 1st Aug 1920 | Box 4 \ 5 05-page084 | |
| Explanation of primary and secondary oscillations within a high-frequency air core transformer and magneto ignition systems. | 1st Aug 1920 | Box 4 \ 5 05-page085 | |
| Page describing the electrical behavior of primary and secondary currents and flux redistribution in an armature core. | 10th Apr 1929 | Box 4 \ 5 05-page086 | |
| The characteristics and effects of the initial spark versus the arc discharge in an ignition system. | 10th Apr 1929 | Box 4 \ 5 05-page087 | |
| The arc effect in magnetos at high speeds, its issues, and potential remedies. | 10th Apr 1929 | Box 4 \ 5 05-page088 | |
| Page discussing methods to alter spark effects by manipulating magnetic flux and secondary turns in an ignition system. | 21th Oct 1920 | Box 4 \ 5 05-page089 | |
| List of weights for different magnetos available for testing. | 21th Oct 1920 | Box 4 \ 5 05-page090 | |
| List of magnetos fitted to various experimental cars. | 22th Oct 1920 | Box 4 \ 5 05-page091 | |
| The delayed testing and preliminary inspection of magnetos supplied from America. | 9th Nov 1920 | Box 4 \ 5 05-page092 | |
| Standard for defining the direction of rotation for electrical machines to avoid ambiguity. | 10th Nov 1920 | Box 4 \ 5 05-page093 | |
| Letter from Eyquem Sparking Plugs Ltd. offering G. & A. Magnetos with a trade discount and advertising their magneto repair services. | 17th Nov 1920 | Box 4 \ 5 05-page094 | |
| Sales leaflet for 'LA FRANÇAISE G.A' high-tension magnetos, including prices and ordering instructions. | 17th Nov 1920 | Box 4 \ 5 05-page095 | |
| Specification sheet for G.A. high tension waterproof magnetos, detailing features, types, and dimensions. | 17th Nov 1920 | Box 4 \ 5 05-page096 | |
| Brochure for 'La Française' waterproof magnetos for 2-cylinder engines, detailing ordering information, prices and conditions of sale. | 17th Nov 1920 | Box 4 \ 5 05-page097 | |
| Specification sheet for G.A. high-tension waterproof magnetos, detailing special features, types, and measurements. | 15th May 1909 | Box 4 \ 5 05-page098 | |
| Product brochure for 'La Française' waterproof magnetos, detailing types, prices, and ordering information. | 15th May 1909 | Box 4 \ 5 05-page099 | |
| Specification sheet detailing the features and dimensions of G.A. high-tension waterproof magnetos. | 15th May 1909 | Box 4 \ 5 05-page100 | |
| Brochure for 'La Française' G.A. waterproof magnetos, providing ordering instructions, prices, and conditions of sale. | 15th May 1909 | Box 4 \ 5 05-page101 | |
| Technical brochure for G. A. high-tension waterproof magnetos, detailing features and specifications for types D1 and D2. | 15th May 1909 | Box 4 \ 5 05-page102 | |
| Sales brochure for 'La Française' oscillating magnetos from H. Arqmbourg & Joret. | 15th May 1909 | Box 4 \ 5 05-page103 | |
| Technical brochure detailing the features, types, and measurements of G.A. high-tension waterproof magnetos. | 18th Nov 1920 | Box 4 \ 5 05-page104 | |
| The procedure for the comparison and testing of experimental magnetos. | 18th Nov 1920 | Box 4 \ 5 05-page105 | |
| Procedure outlining a series of electrical and endurance tests for a magneto. | 18th Nov 1920 | Box 4 \ 5 05-page106 | |
| Test procedure for a magneto's spark-producing capability under adverse conditions using Remy coils. | 18th Nov 1920 | Box 4 \ 5 05-page107 | |
| Test specification outlining procedures for evaluating magneto sparking performance. | 11th Sep 1927 | Box 4 \ 5 05-page108 | |
| Continued list of testing procedures for an electrical component, including resistance, current, and flux measurements. | 11th Sep 1927 | Box 4 \ 5 05-page109 | |
| Quotation from B. M. Fair & Co. for magnetos for a 40/50 HP 6 Cylinder Engine. | 19th Nov 1920 | Box 4 \ 5 05-page110 | |
| Cover letter forwarding information about a 'La Francaia' G.A. magneto. | 22th Nov 1920 | Box 4 \ 5 05-page111 | |
| Sales letter from The Salmson Magneto Company regarding their magnetos. | 23th Nov 1920 | Box 4 \ 5 05-page112 | |
| Sales letter from The Salmson Magneto Company regarding their motor car magnetos. | 29th Nov 1920 | Box 4 \ 5 05-page113 | |
| Instructions for a utility test of a spark-coil or magneto. | 27th Nov 1920 | Box 4 \ 5 05-page114 | |
| Instructions for a utility test experimenting with creating a non-inductive resistance. | 26th Jan 1939 | Box 4 \ 5 05-page115 | |
| Instructions for a utility test on electrical coils, detailing series connections and measurements. | 1st Jun 1919 | Box 4 \ 5 05-page116 | |
| Instructions and results for a utility test on Magneto X.3199. | 10th Dec 1920 | Box 4 \ 5 05-page117 | |
| Instruction sheet detailing a utility test on magnetos, noting the effect of safety gap size. | 24th May 1919 | Box 4 \ 5 05-page118 | |
| Instructions for a utility test on a standard ignition coil with leakage resistance. | 15th Mar 1920 | Box 4 \ 5 05-page119 | |
| Ability test of a spark-coil, comparing its performance against a Watford E6 magneto under various conditions. | 10th Dec 1920 | Box 4 \ 5 05-page120 | |
| Procedure for a 'Utility' test of a spark coil on a magneto. | 7th Jan 1921 | Box 4 \ 5 05-page121 | |
| Report comparing the performance of a Watford E.6 magneto with a standard battery ignition system. | 17th Jan 1921 | Box 4 \ 5 05-page122 | |
| Comparative test of spark length for magneto and battery ignition systems under different leakage conditions. | 21th Dec 1920 | Box 4 \ 5 05-page123 | |
| Letter to Claude Johnson regarding electrical apparatus issues on postwar chassis and the resulting high service costs. | 9th Dec 1920 | Box 4 \ 5 05-page124 | |
| Chasing outstanding replies from the Derby factory regarding luggage carriers, spark plugs, and magnetos. | 8th Dec 1920 | Box 4 \ 5 05-page125 | |
| Comparison of American and Watford magnetos, highlighting the difficulties and resource drain caused by repairing the latter. | 1st Dec 1920 | Box 4 \ 5 05-page126 | |
| Extract detailing a schedule of bench tests for various experimental magnetos. | 16th Dec 1920 | Box 4 \ 5 05-page127 | |
| The potential applications of Bakelite in car manufacturing, including steering wheels, gears, and coachwork. | 21th Dec 1920 | Box 4 \ 5 05-page128 | |
| Review of American-made magnetos being considered for the 40/50 chassis due to issues with the standard model. | 1st Jan 1921 | Box 4 \ 5 05-page129 | |
| The standardization and testing of American magnetos for U.S.A. cars compared to those used in Derby. | 1st Jan 1921 | Box 4 \ 5 05-page130 | |
| Magneto models submitted by the Watford, Conner, and B.T.H. companies for consideration. | 1st Jan 1921 | Box 4 \ 5 05-page131 | |
| The comparative merits of Bosch and British (B.T.H.) magnetos for potential standardisation. | 1st Jan 1921 | Box 4 \ 5 05-page132 | |
| Description of the B.T.H. Type 'MM' Magneto. | 24th Jan 1921 | Box 4 \ 5 05-page133 | |
| Table of minimum sparking speeds for various post-war Bosch and B.T.H. magneto models. | 28th Jan 1921 | Box 4 \ 5 05-page134 | |
| Procedure for the comparison and testing of experimental magnetos. | 28th Jan 1921 | Box 4 \ 5 05-page135 | |
| Page from a magneto test procedure outlining steps for circuit and performance testing. | 28th Jan 1921 | Box 4 \ 5 05-page136 | |
| Procedure for conducting utility tests on a magneto under various conditions. | 28th Jan 1921 | Box 4 \ 5 05-page137 | |
| Instructions for testing the sparking characteristics and performance of a magneto. | 3rd Feb 1921 | Box 4 \ 5 05-page138 | |
| Test procedure for a magneto's high-speed sparking gap. | 3rd Feb 1921 | Box 4 \ 5 05-page139 | |
| Testing procedures for magneto sparking and winding resistance. | 3rd Feb 1921 | Box 4 \ 5 05-page140 | |
| Instructions for adjusting primary point gap and measuring armature core flux. | 1st Feb 1921 | Box 4 \ 5 05-page141 | |
| Table of results from magneto performance tests. | 1st Feb 1921 | Box 4 \ 5 05-page142 | |
| Data table comparing performance characteristics of various magnetos. | 1st Feb 1921 | Box 4 \ 5 05-page143 | |
| Comparison table of performance characteristics for various magnetos. | 2nd Feb 1921 | Box 4 \ 5 05-page144 | |
| Instruction sheet detailing the number of earthing brushes on different magneto models. | 2nd Feb 1921 | Box 4 \ 5 05-page145 | |
| Comparing the performance of Bosch and Watford magnetos. | 1st Mar 1921 | Box 4 \ 5 05-page146 | |
| Experimental bench tests and examination of three different magnetos. | 21th Mar 1921 | Box 4 \ 5 05-page147 | |
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