| Description | Date | Identifier | |
| Engine performance data from Test 2 and Test 3, comparing magneto and battery ignition systems. | 16th Jun 1923 | Box 54 \ 5 Scan244 | |
| Engine performance test results comparing magneto and battery ignition systems. | 16th Jun 1923 | Box 54 \ 5 Scan245 | |
| Faults and improvements for Goshawk electrical units. | 1st Jul 1923 | Box 54 \ 5 Scan246 | |
| Extract from a memo discussing progress on electrical work for ignition systems. | 20th Sep 1923 | Box 54 \ 5 Scan247 | |
| The relative timing of the battery ignition and magneto. | 17th Oct 1923 | Box 54 \ 5 Scan248 | |
| Modifications to rotor blades to address magneto spark issues. | 17th Oct 1923 | Box 54 \ 5 Scan249 | |
| Starting issues with the Goshawk engine's battery ignition system. | 9th Jan 1924 | Box 54 \ 5 Scan250 | |
| Goshawk engine battery and magneto ignition diagram graph. | 1st Nov 1933 | Box 54 \ 5 Scan251 | |
| Developing a formula for the ignition break position for starting the Goshawk engine. | 9th Jan 1924 | Box 54 \ 5 Scan252 | |
| Calculation of ignition timing parameters and conditions required for an engine starting spark. | 9th Jan 1924 | Box 54 \ 5 Scan253 | |
| Page from a report analyzing spark timing and ignition settings with mathematical calculations. | 9th Jan 1924 | Box 54 \ 5 Scan254 | |
| List of tests and calculations for a battery ignition system. | 31th Jul 1924 | Box 54 \ 5 Scan255 | |
| Change log tracking modifications for battery ignition coils. | 31th Jul 1924 | Box 54 \ 5 Scan256 | |
| Specification sheet for a standard tall stabalite encased battery ignition coil. | 29th Apr 1924 | Box 54 \ 5 Scan257 | |
| Specifications and test conditions for a contact breaker and secondary coil on a 20 HP chassis. | 5th Apr 1924 | Box 54 \ 5 Scan258 | |
| Continued analysis of current consumption variations at different speeds, comparing observed and calculated values for ignition systems. | 29th Apr 1924 | Box 54 \ 5 Scan259 | |
| Ignition energy consumption, ballast resistance, and the performance of tungsten points. | 29th Apr 1924 | Box 54 \ 5 Scan260 | |
| Continued report on the performance of points, noting issues of burning or pitting and referencing a previous bench test. | 29th Apr 1924 | Box 54 \ 5 Scan261 | |
| Graph of current consumption curves for a standard tall coil in a Stabalite case at 8 and 12 volts. | 1st Jul 1932 | Box 54 \ 5 Scan262 | |
| Graph of the Gap-Make Ratio curve versus the Primary Gap for a standard Goshawk distributor. | 14th Mar 1934 | Box 54 \ 5 Scan263 | |
| Data table showing variations with 'Steel VI' without expansion, based on speed fraction and efficiency calculations. | 5th May 1924 | Box 54 \ 5 Scan264 | |
| Establishing a standard for chemical leak utility tests for magneto and battery ignition systems. | 5th May 1924 | Box 54 \ 5 Scan265 | |
| Comparison of calculated and observed average current values showing the effect of make-ratio variation for a standard tall coil and distributor. | 22th May 1924 | Box 54 \ 5 Scan266 | |
| Investigation into wire breakage on the 20 HP. type of ballast resistance. | 27th May 1924 | Box 54 \ 5 Scan267 | |
| From EFC to BY concerning the inability to obtain ballast resistances for experimental cars. | 29th May 1924 | Box 54 \ 5 Scan268 | |
| The replacement and examination of 20 HP ballast resistances. | 3rd Jun 1924 | Box 54 \ 5 Scan269 | |
| Experiments and results on Goshawk ballast resistances. | 11th Jun 1924 | Box 54 \ 5 Scan270 | |
| Quality of wire and the oxidization of resistances. | 11th Jun 1924 | Box 54 \ 5 Scan271 | |
| Test report on the deterioration of nickel ballast resistance wire under various conditions. | 6th Jun 1924 | Box 54 \ 5 Scan272 | |
| Investigation into the deterioration and failure of Ballast Resistance Wires. | 18th Jun 1924 | Box 54 \ 5 Scan273 | |
| Dispatch of curves for automatic advance on the EAC.II and 20 HP engines. | 27th Aug 1924 | Box 54 \ 5 Scan274 | |
| Explaining the use and application of various ignition and magneto specification curves for setting engine requirements. | 27th Aug 1924 | Box 54 \ 5 Scan275 | |
| Comparing engine performance curves and automatic advance characteristics. | 27th Aug 1924 | Box 54 \ 5 Scan276 | |
| Breakdown of ignition advance curves into sub-groups for different engine and magneto configurations. | 27th Aug 1924 | Box 54 \ 5 Scan277 | |
| The average advance curves for various Scintilla magnetos and their application to an engine. | 27th Aug 1924 | Box 54 \ 5 Scan278 | |
| Adjustments to magneto and battery ignition specifications, particularly for the EAC.2 engine. | 27th Aug 1924 | Box 54 \ 5 Scan279 | |
| Synchronizing magneto and battery ignition systems and a formula for flick start retard. | 27th Aug 1924 | Box 54 \ 5 Scan280 | |
| Continued discussion on the 20 HP battery ignition governor spring and distributor speed limits. | 27th Aug 1924 | Box 54 \ 5 Scan281 | |
| Graph showing the required ignition advance range against engine speed for a 20 HP engine. | 3rd Feb 1922 | Box 54 \ 5 Scan282 | |
| Table of electrical measurements and running quantities for a standard ignition system. | 25th Mar 1925 | Box 54 \ 5 Scan283 | |
| Instruction sheet detailing a new sheet aluminium cover for the ballast resistance on the dash. | 24th Apr 1925 | Box 54 \ 5 Scan284 | |
| Instruction suggesting a cover for the ballast resistance be standardized on the 20HP chassis. | 20th Aug 1926 | Box 54 \ 5 Scan285 | |
| Strongly criticizing drawing D Scheme 255 for a 20 HP battery ignition system, highlighting numerous design flaws. | 10th Aug 1925 | Box 54 \ 5 Scan286 | |
| 13,000-mile fault-free test of a ballast resistance cover and questioning its necessity. | 23th Sep 1925 | Box 54 \ 5 Scan287 | |
| Decision not to fit the Ballast Resistance Cover at the present time. | 25th Sep 1925 | Box 54 \ 5 Scan288 | |
| Extract from a report on the performance of a 20 HP car in France, detailing issues with ignition and lamps. | 29th Sep 1921 | Box 54 \ 5 Scan289 | |
| Chassis 10-GII after 2948 miles, detailing the state of the battery ignition system. | 12th Apr 1926 | Box 54 \ 5 Scan290 | |
| Battery ignition issues for chassis 10-GIII after completing 7526 miles. | 23th Apr 1926 | Box 54 \ 5 Scan291 | |
| Chassis -10.GIII after 10,027 miles, concerning the battery ignition system. | 4th May 1926 | Box 54 \ 5 Scan292 | |
| Improvements to the battery ignition contact points for Phantom, 20HP, and Silver Ghost models. | 25th Jan 1927 | Box 54 \ 5 Scan293 | |
| Ignition system components, including contact materials and distributor design. | 4th Feb 1927 | Box 54 \ 5 Scan294 | |
| Satisfaction with a new trials car and improvements for the Phantom & 20 HP models, including parts stock management. | 4th Feb 1927 | Box 54 \ 5 Scan295 | |
| Reply concerning electrical troubles with magneto and battery ignition points on various car models. | 14th Feb 1927 | Box 54 \ 5 Scan296 | |
| The performance of magneto distributor points and dynamo brushes for the 20 HP model. | 10th May 1927 | Box 54 \ 5 Scan297 | |
| Chassis 10G3 after a 10,000 mile test in France, detailing ignition issues. | 10th May 1927 | Box 54 \ 5 Scan298 | |
| Dual versus single ignition for India engines, referencing the 20 HP and Lorraine Dietrich engines. | 7th Mar 1928 | Box 54 \ 5 Scan299 | |
| Continued analysis of spark advance with single versus dual ignition, comparing different engines and compression ratios. | 7th Mar 1928 | Box 54 \ 5 Scan300 | |
| The effectiveness of turbulent heads versus synchronised ignition in reducing spark advance and detonation on 20 HP and Phantom engines. | 7th Mar 1928 | Box 54 \ 5 Scan301 | |
| Ignition timing for turbulent heads and recommending opposed dual ignition for the new India engine. | 7th Mar 1928 | Box 54 \ 5 Scan302 | |
| Graph showing the necessary minimum ignition advance for full power on a 20 HP engine. | 7th Mar 1928 | Box 54 \ 5 Scan303 | |
| Graph of ignition advance curves for different Phantom engine configurations against engine RPM. | 25th Oct 1928 | Box 54 \ 5 Scan304 | |
| The factors affecting the position of the ignition lever for starting on the Phantom and 20 HP models. | 25th Oct 1928 | Box 54 \ 5 Scan305 | |
| Instructions for diagnosing and adjusting ignition timing and related components on 20 HP and Phantom chassis. | 25th Oct 1928 | Box 54 \ 5 Scan306 | |
| Page detailing fault analysis for ignition timing, concerning the contact breaker's make ratio and the retard quadrant position. | 30th Oct 1928 | Box 54 \ 5 Scan307 | |
| Development of a formula to determine the ignition break position for starting the engine. | 30th Oct 1928 | Box 54 \ 5 Scan308 | |
| Technical analysis of engine ignition timing and spark generation. | 30th Oct 1928 | Box 54 \ 5 Scan309 | |
| Technical analysis of ignition spark timing and retard settings, including a formula. | 17th Dec 1928 | Box 54 \ 5 Scan310 | |
| Investigating and resolving misfires on the 20-HP battery ignition system by fitting a special ballast. | 17th Dec 1928 | Box 54 \ 5 Scan311 | |
| Testing of an experimental ballast resistance for a 20 HP battery ignition system. | 18th Dec 1928 | Box 54 \ 5 Scan312 | |
| Query regarding the feasibility of raising the ignition tower without impeding access to the No.1 sparking plug. | 18th Jan 1929 | Box 54 \ 5 Scan313 | |
| Instruction sheet detailing ignition tests on a 20 HP chassis, comparing ballast resistances and ignition systems. | 25th Mar 1929 | Box 54 \ 5 Scan314 | |
| Report page on ignition performance testing with different ballast resistances at various voltages. | 9th Dec 1924 | Box 54 \ 5 Scan315 | |
| Ignition system performance, noting issues with magneto ignition when the engine is hot and at low speeds. | 9th Dec 1924 | Box 54 \ 5 Scan316 | |
| Extract from a report suggesting a second ignition coil as a standby instead of a magneto for the 20 HP car. | 4th Dec 1929 | Box 54 \ 5 Scan317 | |
| Intermittent ignition coil failures on the 20 HP model, referencing specific chassis and a concerning comment from the Managing Director of Bosch Co. | 19th May 1930 | Box 54 \ 5 Scan318 | |
| Battery ignition distributor rotor failures during endurance tests and recommendations for increasing insulation thickness. | 20th May 1930 | Box 54 \ 5 Scan319 | |
| Ballast resistances and tungsten contact point failures for a 20 HP chassis for Rugeroni. | 28th May 1930 | Box 54 \ 5 Scan320 | |
| Returned parts for a 20 HP chassis GYL-61 and correcting a previous communication error. | 29th May 1930 | Box 54 \ 5 Scan321 | |
| The condition of faulty battery ignition parts from a 20 HP Chassis GYL-61. | 19th May 1930 | Box 54 \ 5 Scan322 | |
| Confirming a verbal arrangement to change the spark plug gap for a 20/25 HP chassis with battery ignition. | 2nd Jun 1930 | Box 54 \ 5 Scan323 | |
| Persistent intermittent ignition failures on chassis GYL-61 and requesting diagnostic suggestions. | 3rd Jun 1930 | Box 54 \ 5 Scan324 | |
| Potential causes of intermittent ignition failure on a 20 HP. Chassis GYL-61. | 5th Jun 1930 | Box 54 \ 5 Scan325 | |
| Engine misfire caused by contact gap wear and a proposed distributor modification. | 5th Jun 1930 | Box 54 \ 5 Scan326 | |
| Investigation into a misfiring issue on a 20/25 HP customer chassis, caused by the ignition contact breaker gap. | 6th Jun 1930 | Box 54 \ 5 Scan327 | |
| Seizing battery ignition contact lever pivot, with a suggestion for a self-lubricating design. | 14th Aug 1930 | Box 54 \ 5 Scan328 | |
| Inquiry into cases of seizure of the battery ignition contact breaker lever on its pivot. | 8th Sep 1930 | Box 54 \ 5 Scan329 | |
| The seizure of the battery ignition contact breaker lever on its pivot due to a lack of lubrication. | 9th Sep 1930 | Box 54 \ 5 Scan330 | |
| Seizure of the battery ignition contact breaker lever on its pivot. | 22th Sep 1930 | Box 54 \ 5 Scan331 | |
| The seizing of the battery ignition contact lever pivot due to lubrication and rust issues. | 23th Sep 1930 | Box 54 \ 5 Scan332 | |
| Modifications for a self-lubricating pivot pin, tested on chassis 10-G3. | 23th Sep 1930 | Box 54 \ 5 Scan333 | |
| Letter to Mr. G.R.N. Minchin regarding 20 HP ignition, misfiring, and condenser points. | 24th Sep 1930 | Box 54 \ 5 Scan334 | |
| Letter to Messrs. Peto & Radford regarding the testing of lower capacity condensers to fix a misfiring issue. | 24th Sep 1930 | Box 54 \ 5 Scan335 | |
| Material changes for the battery ignition contact lever pivot to prevent corrosion. | 29th Sep 1930 | Box 54 \ 5 Scan336 | |
| Adjustments to the distributor and sparking plug gaps for the 20/25 HP ignition system. | 4th Nov 1930 | Box 54 \ 5 Scan337 | |
| Experiments investigating sparking over within the distributor of a 20/25 ignition system. | 9th Nov 1930 | Box 54 \ 5 Scan338 | |
| Tests of the 20/25 ignition system, finding the coil voltage insufficient and requesting a new design. | 4th Dec 1930 | Box 54 \ 5 Scan339 | |
| Proposal to test a 20/25 HP engine with an interlaced crank, questioning the ignition coil's performance at high speeds. | 12th Dec 1930 | Box 54 \ 5 Scan340 | |
| The 20/25 HP coil ignition, advising that spark plug gaps should be checked (.020) and plugs kept clean, rather than replacing the coil. | 15th Dec 1930 | Box 54 \ 5 Scan341 | |
| Investigation into battery ignition misfiring on the 20/25 HP engine, leading to a reduction in sparking plug gap size. | 7th Dec 1930 | Box 54 \ 5 Scan342 | |
| Sparking plug voltage tests carried out on 20/25 and 40/50 chassis. | 7th Dec 1930 | Box 54 \ 5 Scan343 | |
| | | | |
