| Description | Date | Identifier | |
| Implementation of automatic ignition advance, its advantages over hand control, and a proposal for testing ignition timing. | 1st Mar 1920 | Box 37 \ 1 scan 212 | |
| Continued page of a report discussing information gathering from testing minimum to maximum speeds. | 1st Mar 1920 | Box 37 \ 1 scan 213 | |
| Article from 'The Motor' magazine about a new S.E.V. automatic advance magneto. | 18th Feb 1920 | Box 37 \ 1 scan 214 | |
| New worm gear record and a discussion on the economic considerations for automobile engineers. | 18th Feb 1920 | Box 37 \ 1 scan 215 | |
| Special ignition coil tests and requesting optimal ignition advance settings for various engine speeds. | 20th Apr 1920 | Box 37 \ 1 scan 216 | |
| Test results and specifications for a Packard 12-cylinder engine. | 25th Jun 1920 | Box 37 \ 1 scan 217 | |
| Engine power testing through various gears and observations on a Packard engine's ignition advance. | 25th Jun 1920 | Box 37 \ 1 scan 218 | |
| Test report on engine spark timing at different speeds, with a table of ignition points versus RPM and comparison to a Packard car. | 25th Jun 1920 | Box 37 \ 1 scan 219 | |
| Notes on ignition timing settings, Packard clutch specifications, and engine performance from bench tests. | 25th Aug 1920 | Box 37 \ 1 scan 220 | |
| Requesting information on optimal ignition advance settings for various engine speeds to prevent backfiring. | 22th Sep 1920 | Box 37 \ 1 scan 221 | |
| Ignition timing specifications, including lead and retard angles for a magneto-equipped engine at various RPMs. | 15th Feb 1921 | Box 37 \ 1 scan 222 | |
| Assessment of an American Bosch battery ignition system, comparing its governor, contact maker, and coil. | 16th Feb 1921 | Box 37 \ 1 scan 223 | |
| Table showing the timing in degrees for both magneto and battery governed ignitions at various engine speeds. | 2nd Mar 1921 | Box 37 \ 1 scan 224 | |
| Test results for governed ignition timing, comparing different spark plug positions. | 10th Mar 1921 | Box 37 \ 1 scan 225 | |
| Ignition advance test results for Goshawk and 40/50 engines. | 14th Apr 1921 | Box 37 \ 1 scan 226 | |
| Procedure for marking ignition timing using a dynamometer shaft-mounted drum and a high tension wire. | 4th Apr 1921 | Box 37 \ 1 scan 227 | |
| Test data for starting the Goshawk I engine, including torque measurements and spark advance figures. | 28th Apr 1921 | Box 37 \ 1 scan 228 | |
| Goshawk I engine battery ignition timing data at various speeds. | 28th Apr 1921 | Box 37 \ 1 scan 229 | |
| Table of Goshawk II ignition settings showing flywheel degrees where horsepower falls off at various RPMs. | 3rd Feb 1922 | Box 37 \ 1 scan 230 | |
| Criticisms of the Goshawk car, focusing on suggestions for the carburetter mixture and ignition controls. | 23th Mar 1922 | Box 37 \ 1 scan 231 | |
| Continued internal memorandum discussing a report and sales considerations to answer future criticisms. | 15th Mar 1917 | Box 37 \ 1 scan 232 | |
| Proposing to fit a Goshawk-style governed ignition to the 40/50 model due to its advantages in slow running. | 17th Oct 1922 | Box 37 \ 1 scan 233 | |
| Causes of harsh engines, attributing the issue to overly advanced ignition timing. | 18th Oct 1922 | Box 37 \ 1 scan 234 | |
| Continued note detailing how extra retarding enabled the engine to start on the switch. | 11th Dec 1936 | Box 37 \ 1 scan 235 | |
| Characteristic curves of a Bregshana automatic ignition advance governor. | 11th Dec 1936 | Box 37 \ 1 scan 236 | |
| Reverse side of a document showing an official date stamp. | 18th Oct 1922 | Box 37 \ 1 scan 237 | |
| Standard ignition timing specifications for the Goshawk engine. | 24th Nov 1922 | Box 37 \ 1 scan 238 | |
| Covering memo for a letter received from Springfield regarding the Spark Advance Mechanism. | 20th Aug 1923 | Box 37 \ 1 scan 239 | |
| Letter discussing developments in spark advance mechanisms, particularly automatic systems. | 3rd Aug 1923 | Box 37 \ 1 scan 240 | |
| Impressions and objections regarding automatic spark advancement in engines. | 21th Aug 1923 | Box 37 \ 1 scan 241 | |
| From EFC requesting ignition timing diagrams for the 40/50 and 20 HP models. | 12th Oct 1923 | Box 37 \ 1 scan 242 | |
| The relative timing of the battery and magneto ignition systems. | 17th Oct 1923 | Box 37 \ 1 scan 243 | |
| Modifications to rotor blades for the magneto spark system. | 17th Oct 1923 | Box 37 \ 1 scan 244 | |
| Relationship between magneto and battery controls, and proposing a new hydraulic ignition advance mechanism. | 18th Oct 1923 | Box 37 \ 1 scan 245 | |
| Definition and settings for the 20 HP battery ignition timing. | 23th Oct 1923 | Box 37 \ 1 scan 246 | |
| Continued discussion on ignition timing adjustments and the effectiveness of the retard feature. | 23th Oct 1923 | Box 37 \ 1 scan 247 | |
| Ignition timing specifications for the Goshawk engine. | 23th Oct 1923 | Box 37 \ 1 scan 248 | |
| Diagram illustrating the battery and magneto ignition advance for a Goshawk engine. | 1st Nov 1933 | Box 37 \ 1 scan 249 | |
| Back page with a Print Room date stamp. | 25th Oct 1924 | Box 37 \ 1 scan 250 | |
| The starting procedure and ignition settings for the Goshawk engine. | 9th Jan 1924 | Box 37 \ 1 scan 251 | |
| Design of an oil retainer, magneto governing, and ignition systems for the 3rd E.A.C. engine. | 1st Feb 1924 | Box 37 \ 1 scan 252 | |
| To determine the required degree of ignition advance on an EAC engine. | 1st Apr 1924 | Box 37 \ 1 scan 253 | |
| The ignition advance required to maintain power for an E.A.C. engine. | 12th Jul 1923 | Box 37 \ 1 scan 254 | |
| Engine performance data with synchronized and magneto-only ignition systems. | 1st Apr 1924 | Box 37 \ 1 scan 255 | |
| Performance data from an ignition test at various engine speeds. | 1st Apr 1924 | Box 37 \ 1 scan 256 | |
| Graph of ignition advance curves versus engine speed for an S.A.C. engine, with Hispano engine curves for comparison. | 31th Mar 1924 | Box 37 \ 1 scan 257 | |
| Graph of ignition curves for an E.A.C. engine, plotting ignition advance against engine speed for different ignition systems. | 31th Mar 1924 | Box 37 \ 1 scan 258 | |
| Drawing and description of a combined magneto and battery ignition automatic advance hydraulic relay. | 1st Apr 1924 | Box 37 \ 1 scan 259 | |
| Design document explaining the operation of a multi-piston valve system with diagrams. | 1st Apr 1924 | Box 37 \ 1 scan 260 | |
| Design of an automatic ignition advance mechanism using a floating lever and oil pressure. | 9th Aug 1924 | Box 37 \ 1 scan 261 | |
| Proposed ignition governor and advance curve for the EAC engine. | 9th Aug 1924 | Box 37 \ 1 scan 262 | |
| Automatic advance settings for the HAC.2 engine, showing maximum and minimum engine degrees B.D.P. at various speeds. | 21th Aug 1924 | Box 37 \ 1 scan 263 | |
| The specifications for four sheets of automatic advance curves for various ignition systems. | 27th Aug 1924 | Box 37 \ 1 scan 264 | |
| List describing various ignition advance curves for the EAC engine. | 27th May 1924 | Box 37 \ 1 scan 265 | |
| Dispatch of automatic advance curves for the EAC.II and 20 HP engines. | 27th Aug 1924 | Box 37 \ 1 scan 266 | |
| Continued page describing various ignition system curves and their application for 20 HP and EAC.2 models. | 27th Aug 1924 | Box 37 \ 1 scan 267 | |
| Comparison of engine performance curves and automatic advance characteristics. | 27th Aug 1924 | Box 37 \ 1 scan 268 | |
| List categorizing ignition advance curves for various engines, chassis, and magnetos. | 27th Aug 1924 | Box 37 \ 1 scan 269 | |
| Page discussing average advance curves for various Scintilla magnetos and their application to a 20 HP engine. | 27th Aug 1924 | Box 37 \ 1 scan 270 | |
| Adjustments to magneto and battery ignition timing specifications for the 20 HP and EAC.2 engines. | 27th Aug 1924 | Box 37 \ 1 scan 271 | |
| Synchronizing the advances of battery and magneto ignition systems. | 1st Aug 1924 | Box 37 \ 1 scan 272 | |
| Continued response to a query regarding the battery ignition governor spring and distributor speed limits for a 20 HP engine. | 27th Aug 1924 | Box 37 \ 1 scan 273 | |
| Diagram illustrating the ignition timing advance for battery and magneto systems. | 28th Aug 1924 | Box 37 \ 1 scan 274 | |
| Blank page marked with a red 'Print Room, Derby' stamp. | 28th Aug 1924 | Box 37 \ 1 scan 275 | |
| Graph showing the required ignition advance curves for the 20HP engine. | 27th Aug 1924 | Box 37 \ 1 scan 276 | |
| Blank document page with a Print Room date stamp. | 28th Aug 1924 | Box 37 \ 1 scan 277 | |
| Graph showing the maximum and minimum ignition advance curves required for the E.A.C.II engine. | 22th Aug 1924 | Box 37 \ 1 scan 278 | |
| Blank document page with a Print Room stamp from Derby. | 29th Aug 1924 | Box 37 \ 1 scan 279 | |
| Characteristic curves for the Goshawk automatic ignition advance governor. | 28th Aug 1934 | Box 37 \ 1 scan 280 | |
| Stamped document from the Print Room in Derby. | 29th Aug 1924 | Box 37 \ 1 scan 281 | |
| Graph showing the automatic advance of cam with speed for Scintilla Magnetos types AG6A and AM6A. | 28th Aug 1934 | Box 37 \ 1 scan 282 | |
| Blank page with a red 'PRINT ROOM' date stamp. | 29th Aug 1924 | Box 37 \ 1 scan 283 | |
| Graph and table detailing the automatic and hand advance characteristics of an R Distributor and various Scintilla Magnetos. | 28th Aug 1924 | Box 37 \ 1 scan 284 | |
| Blank document page with a print room date stamp. | 29th Aug 1924 | Box 37 \ 1 scan 285 | |
| Graph and table detailing the automatic advance characteristics of Distributor, Scintilla, and Eisemann magnetos. | 28th Aug 1924 | Box 37 \ 1 scan 286 | |
| Blank document cover sheet with a red ink 'Print Room' stamp. | 29th Aug 1924 | Box 37 \ 1 scan 287 | |
| Diagram of the 40/50 model's battery and magneto ignition advance curves. | 24th Apr 1926 | Box 37 \ 1 scan 288 | |
| Stamped document from the print room in Derby. | 24th Apr 1926 | Box 37 \ 1 scan 289 | |
| Diagram showing battery and magneto ignition timing advance curves. | 30th May 1924 | Box 37 \ 1 scan 290 | |
| Stamped cover page from the archives. | 24th Apr 1928 | Box 37 \ 1 scan 291 | |
| Secret internal memorandum discussing the development of an automatic ignition advance system and other modifications for the 40/50 model. | 1st Sep 1924 | Box 37 \ 1 scan 292 | |
| Secret memo discussing drawings for an automatic advance system for battery and magneto ignitions. | 13th Sep 1924 | Box 37 \ 1 scan 293 | |
| Blueprints, patent work for an automatic relay device, and the importance of keeping the information secret. | 13th Sep 1924 | Box 37 \ 1 scan 294 | |
| General magneto specification document featuring two performance curves. | 13th Sep 1924 | Box 37 \ 1 scan 295 | |
| Graph illustrating performance curves for a Scintilla AGGA component. | 13th Sep 1924 | Box 37 \ 1 scan 296 | |
| Hand-drawn graph of curves for a Scintilla amba device. | 13th Sep 1924 | Box 37 \ 1 scan 297 | |
| Hand-drawn graph with two curves related to battery ignition. | 13th Sep 1924 | Box 37 \ 1 scan 298 | |
| Hand-drawn graph with two curves, supplied by Scintilla & Co. | 14th May 1925 | Box 37 \ 1 scan 299 | |
| Specifying ignition timing settings for an engine. | 14th May 1925 | Box 37 \ 1 scan 300 | |
| Automatic advance mechanism issues for the Phantom model, including magneto noise and governor modifications. | 4th May 1926 | Box 37 \ 1 scan 301 | |
| Inefficiency and proposing modifications to a governor springing mechanism, including a diagram. | 4th May 1926 | Box 37 \ 1 scan 302 | |
| Typed memorandum discussing design improvements and specifications for a governor system, including pistons, weights, and springs. | 4th May 1926 | Box 37 \ 1 scan 303 | |
| Graph and notes analyzing engine ignition advance curves and governor performance. | 5th Apr 1926 | Box 37 \ 1 scan 304 | |
| Concluding remarks on improvements to hydraulic cylinders, governor springs, and engine performance. | 4th May 1926 | Box 37 \ 1 scan 305 | |
| Drawings and design issues for the Phantom Automatic Ignition Advance system. | 17th May 1926 | Box 37 \ 1 scan 306 | |
| Technical memo discussing modifications to ignition timing, governor mechanisms, and firing point diagrams for the Phantom model. | 29th May 1928 | Box 37 \ 1 scan 307 | |
| Ignition advance requirements and control modifications for an aluminium engine with a turbulent head. | 6th May 1927 | Box 37 \ 1 scan 308 | |
| Blueprint comparing ignition advance curves for the Lighter Phantom model up to LEC 2230. | 6th May 1927 | Box 37 \ 1 scan 309 | |
| Blank cover page with a print room stamp. | 6th May 1927 | Box 37 \ 1 scan 310 | |
| Blueprint graph comparing ignition advance curves for a Lighter Phantom engine up to LEC 2230. | 6th May 1927 | Box 37 \ 1 scan 311 | |
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