| Description | Date | Identifier | |
| The testing and design considerations for the Boshawk battery ignition coil. | 18th Nov 1922 | Box 45 \ 4 Scan089 | |
| The electrical properties of insulating materials and the equipment for their measurement. | 18th Nov 1922 | Box 45 \ 4 Scan090 | |
| Coil experiments, focusing on core construction, insulation, and performance issues. | 18th Nov 1922 | Box 45 \ 4 Scan091 | |
| Experiments and comparisons of electrical coils, discussing insulation, performance, and testing standards. | 18th Nov 1922 | Box 45 \ 4 Scan092 | |
| Continued technical note discussing electrical leakage, the Johnsen-Rahbek effect, and ignition circuit components. | 18th Nov 1922 | Box 45 \ 4 Scan093 | |
| Continued memo on reducing loss in coils and transformers by impregnating them with paraffin wax and immersing them in oil. | 18th Nov 1922 | Box 45 \ 4 Scan094 | |
| Letter from a supplier regarding an order for untreated silk ribbon for insulating purposes. | 20th Nov 1922 | Box 45 \ 4 Scan095 | |
| List of planned experiments and measurements concerning Goshawk ignition coils. | 21th Nov 1922 | Box 45 \ 4 Scan096 | |
| The making and testing of an experimental Goshawk battery ignition coil. | 21th Nov 1922 | Box 45 \ 4 Scan097 | |
| Experiments and trials conducted on an ignition coil, detailing electrical characteristics and performance. | 21th Nov 1922 | Box 45 \ 4 Scan098 | |
| Observations on the insulation resistance of a high tension system on a car. | 21th Nov 1922 | Box 45 \ 4 Scan099 | |
| Telegram from Royce regarding a Goshawk engine phenomenon, asking for immediate information on leakage or an electrostatic effect. | 22th Dec 1932 | Box 45 \ 4 Scan100 | |
| Modifications to the Goshawk ignition coil to mitigate heat issues. | 23th Nov 1922 | Box 45 \ 4 Scan101 | |
| Sourcing silk for Goshawk ignition coils. | 24th Nov 1922 | Box 45 \ 4 Scan102 | |
| Specification details for special coils designated G.II, covering coils No. 1, 2, and 3. | 25th Nov 1922 | Box 45 \ 4 Scan103 | |
| Revised ignition coil for the Goshawk 11 engine, including a list of new and standard parts. | 27th Nov 1922 | Box 45 \ 4 Scan104 | |
| Specification list for various electrical components including wires, washers, insulators, and terminals. | 27th Nov 1922 | Box 45 \ 4 Scan105 | |
| Instructions to replace a failing ignition coil with a new Stabalite case model on the Goshawk 11. | 27th Nov 1922 | Box 45 \ 4 Scan106 | |
| Requesting experiments on the Goshawk ignition system's stabilite coil and its ability to start using dry batteries. | 30th Nov 1922 | Box 45 \ 4 Scan107 | |
| Various tests and experiments performed on a Goshawk ignition coil. | 1st Dec 1922 | Box 45 \ 4 Scan108 | |
| Ignition coil experiments and modifications involving Goshawk coils. | 29th Nov 1922 | Box 45 \ 4 Scan109 | |
| Experiments conducted on ignition coils, comparing their performance and resistance. | 29th Nov 1922 | Box 45 \ 4 Scan110 | |
| Results of temperature and electrical tests on ignition coils. | 29th Nov 1922 | Box 45 \ 4 Scan111 | |
| Test report on inductance and sparking performance with and without hedgehogging ends. | 6th Dec 1922 | Box 45 \ 4 Scan112 | |
| Performance comparison report between a standard 40/50 coil and Mr. Brock's No.1 coil. | 6th Dec 1922 | Box 45 \ 4 Scan113 | |
| Coil failure where varnish filling became viscous and ran out of the H.T. terminal. | 19th Jul 1917 | Box 45 \ 4 Scan114 | |
| Proposed modifications and drawings for the Goshawk II battery ignition system. | 8th Dec 1922 | Box 45 \ 4 Scan115 | |
| Proposed modifications to wiring, coil, and other component layouts. | 8th Dec 1922 | Box 45 \ 4 Scan116 | |
| Description of the internal H.T. connection for an improved Goshawk II battery ignition coil. | 1st Dec 1922 | Box 45 \ 4 Scan117 | |
| Confirmation of a telegram sent from EFC to Mr. Royce regarding a leakage issue. | 10th Nov 1922 | Box 45 \ 4 Scan118 | |
| Copy of a telegram sent to Mr. Royce regarding the negligible effect of primary loads. | 20th Nov 1922 | Box 45 \ 4 Scan119 | |
| Experiments conducted to measure the temperatures of Goshawk ignition coils. | 14th Dec 1922 | Box 45 \ 4 Scan120 | |
| Temperature/time curve tests for various engine coil configurations and positions. | 14th Dec 1922 | Box 45 \ 4 Scan121 | |
| Comparison of different ignition coils, including bakelite, staballite and Goshawk types. | 14th Dec 1922 | Box 45 \ 4 Scan122 | |
| Performance comparison of improved bakelite, 40/50, and stabalite coils, focusing on gap tolerance and leakage. | 14th Dec 1922 | Box 45 \ 4 Scan123 | |
| Comparison of performance between a standard 40/50 coil and Mr. Brock's No.1 coil. | 6th Dec 1922 | Box 45 \ 4 Scan124 | |
| Graph plotting temperature rise over time for a carburettor with different insulation setups. | 13th Dec 1922 | Box 45 \ 4 Scan125 | |
| Design limitations and temperature tests for the Coshawk Ignition Coil. | 19th Dec 1922 | Box 45 \ 4 Scan126 | |
| Typed letter discussing new coil designs intended to be made in bakelite cases. | 19th Dec 1922 | Box 45 \ 4 Scan127 | |
| Follow-up memo requesting an answer regarding the Goshawk Ignition Coil. | 2nd Jan 1923 | Box 45 \ 4 Scan128 | |
| Construction and specifications of Coil No. 3, with comparisons to G.II and 40/50 coils. | 2nd Jan 1923 | Box 45 \ 4 Scan129 | |
| Design, materials, and standardisation of the Goshawk ignition coil. | 6th Jan 1923 | Box 45 \ 4 Scan130 | |
| Test report on a Goshawk ignition coil, comparing its performance under various conditions and gap settings. | 9th Jan 1923 | Box 45 \ 4 Scan131 | |
| Coil made to instructions, seeking guidance on further production. | 6th Jan 1923 | Box 45 \ 4 Scan132 | |
| Standardisation of the Goshawk ignition coil following tests. | 8th Jan 1923 | Box 45 \ 4 Scan133 | |
| Material selection for Goshawk and 40/50 coil cases, comparing stabalite and bakelite. | 19th Jan 1923 | Box 45 \ 4 Scan134 | |
| Experiments and proposed standardisation of a new Goshawk ignition coil. | 23th Jan 1923 | Box 45 \ 4 Scan135 | |
| Alterations to a coil case moulding and comparing it to an ordinary 40/50 stahlite coil. | 29th Jan 1923 | Box 45 \ 4 Scan136 | |
| Proposal to standardize Goshawk ignition coils by increasing their length. | 29th Jan 1923 | Box 45 \ 4 Scan137 | |
| Improving ignition component windings and insulation to resolve ongoing difficulties. | 29th Jan 1923 | Box 45 \ 4 Scan138 | |
| Modified, less expensive Goshawk ignition coil design using mouldensite insulation. | 29th Jan 1923 | Box 45 \ 4 Scan139 | |
| Agreement to standardise the modification for a larger 1/8 inch Goshawk ignition coil. | 31th Jan 1923 | Box 45 \ 4 Scan140 | |
| Requesting the construction of three experimental Goshawk ignition coils and querying the design of the coil seating. | 2nd Feb 1923 | Box 45 \ 4 Scan141 | |
| The production of three experimental coils based on Mr. Brock's No.3 coil design. | 3rd Feb 1923 | Box 45 \ 4 Scan142 | |
| Request to obtain special insulating oil paper from Messrs. Attwater for building three experimental ignition coils. | 3rd Feb 1923 | Box 45 \ 4 Scan143 | |
| Test report for a returned ignition coil, model T.G. 3, detailing its condition and test results. | 5th Feb 1923 | Box 45 \ 4 Scan144 | |
| Record of testing, failure, and repair for ignition coils TG2 and TG3. | 7th Feb 1923 | Box 45 \ 4 Scan145 | |
| Listing new parts required for an ignition coil and cancelling previous drawings. | 12th Feb 1923 | Box 45 \ 4 Scan146 | |
| Use of a square base for ignition coils and the choice of materials such as bakelite, mouldensite, or stabalite. | 1st Feb 1923 | Box 45 \ 4 Scan147 | |
| Requesting to increase an order of oil paper for experimental purposes on an ignition coil. | 21th Feb 1923 | Box 45 \ 4 Scan148 | |
| Instructions document detailing the failure of the original TG3 coil during testing. | 28th Feb 1923 | Box 45 \ 4 Scan149 | |
| Instruction sheet detailing the inspection and fault analysis of a returned coil. | 5th Feb 1923 | Box 45 \ 4 Scan150 | |
| New square base ignition coil, enclosing blueprints for new parts and discussing material alterations. | 6th Mar 1923 | Box 45 \ 4 Scan151 | |
| The receipt, testing, and allocation of Goshawk ignition tall coils. | 12th Mar 1923 | Box 45 \ 4 Scan152 | |
| Testing and fitting of new, taller Goshawk ignition coils on car 5-G.II and other Goshawk chassis. | 13th Mar 1923 | Box 45 \ 4 Scan153 | |
| Confirming an arrangement to fit two tall Goshawk coils to chassis G1 and 2 G.II. | 13th Mar 1923 | Box 45 \ 4 Scan154 | |
| Fitting a taller ignition coil for a Goshawk engine and issues with the existing one. | 19th Mar 1923 | Box 45 \ 4 Scan155 | |
| Sending of a taller type ignition coil for a Goshawk engine. | 21th Mar 1923 | Box 45 \ 4 Scan156 | |
| Requesting arrangements for the despatch of an experimental Goshawk ignition coil. | 21th Mar 1923 | Box 45 \ 4 Scan157 | |
| Results of a production test on T.G.3 coils for Goshawk coils. | 16th Mar 1923 | Box 45 \ 4 Scan158 | |
| Instruction and test sheet for four coils, detailing various measurements and remarks. | 6th Nov 1918 | Box 45 \ 4 Scan159 | |
| Instruction sheet regarding production tests on a repaired 4TG3 coil which still appears to be weak. | 4th Apr 1923 | Box 45 \ 4 Scan160 | |
| Instructions and results regarding a reliability test on a 4TG3 coil. | 9th Apr 1923 | Box 45 \ 4 Scan161 | |
| To Mr. Clark regarding the acceptance of a special spark coil that has been rewound. | 7th May 1923 | Box 45 \ 4 Scan162 | |
| Table detailing the resistances and inductances of Goshawk ignition coils. | 22th Nov 1922 | Box 45 \ 4 Scan163 | |
| Test report for a faulty LG2 coil. | 23th May 1923 | Box 45 \ 4 Scan164 | |
| Data sheet recording preliminary bench test results for coil temperature by rise of resistance. | 5th Jun 1923 | Box 45 \ 4 Scan165 | |
| Data table recording coil temperature based on the rise of electrical resistance. | 5th Jun 1923 | Box 45 \ 4 Scan166 | |
| Testing of coil 1G11 fitted into a new case made of Redmanol moulding powder. | 6th Jun 1923 | Box 45 \ 4 Scan167 | |
| Instruction sheet detailing the testing of coil TG2 in a 'Redmanal' case and suggesting its fitment to car 3GII. | 8th Jun 1923 | Box 45 \ 4 Scan168 | |
| Replacement of Goshawk ignition coils on chassis 3-GII. | 9th Jun 1923 | Box 45 \ 4 Scan169 | |
| Transfer and refitting of a 20 HP ignition coil. | 17th Jul 1923 | Box 45 \ 4 Scan170 | |
| Testing of experimental 20 HP ignition coils fitted with new Redmanol cases. | 17th Jul 1923 | Box 45 \ 4 Scan171 | |
| The investigation of failures in 20 HP ignition coils and experiments with improved designs. | 17th Jul 1923 | Box 45 \ 4 Scan172 | |
| Coil failures and potential remedies, discussing various materials and designs. | 17th Jul 1923 | Box 45 \ 4 Scan173 | |
| List detailing coils on various chassis, specifying materials and turn counts. | 23th Jan 1924 | Box 45 \ 4 Scan174 | |
| List cross-referencing Chassis numbers with their corresponding Coil types. | 23th Jan 1924 | Box 45 \ 4 Scan175 | |
| The replacement of a Goshawk ignition coil due to material issues at high temperatures. | 18th Jul 1923 | Box 45 \ 4 Scan176 | |
| List allotting tall coils in Redmanol cases to various chassis for testing. | 21th Jul 1923 | Box 45 \ 4 Scan177 | |
| Notice detailing the placement of Goshawk ignition coils in Redmanol cases onto specific chassis. | 21th Jul 1923 | Box 45 \ 4 Scan178 | |
| Urgent request for mileage information on chassis 3-GII, with the handwritten reply. | 24th Jul 1923 | Box 45 \ 4 Scan179 | |
| Experimental and road test report regarding the standardisation of a half-inch longer ignition coil in a stabalite case. | 24th Jul 1923 | Box 45 \ 4 Scan180 | |
| Coil mileage tests, concluding on the benefits of an improved coil design with a Stabalite case. | 24th Jul 1923 | Box 45 \ 4 Scan181 | |
| Notification regarding the fitting of coil 3TG3 to chassis 5-GII. | 25th Jul 1923 | Box 45 \ 4 Scan182 | |
| Introduction of paper insulation between the primary winding layers of an ignition coil to improve reliability. | 25th Jul 1923 | Box 45 \ 4 Scan183 | |
| Experiment to build three improved battery ignition coils. | 26th Jul 1923 | Box 45 \ 4 Scan184 | |
| Issues with ignition coil insulation, materials, and standardisation. | 26th Jul 1923 | Box 45 \ 4 Scan185 | |
| Failure of three 20-HP ignition coils, requesting replacements and an investigation. | 10th Aug 1923 | Box 45 \ 4 Scan186 | |
| Melted coil sentinel (73°) fitted to a 4-GII. | 16th Aug 1923 | Box 45 \ 4 Scan187 | |
| Test results for the melting point of 73°C coil and condenser sentinels. | 16th Aug 1923 | Box 45 \ 4 Scan188 | |
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