| Description | Date | Identifier | |
| Reallocation of a stock car chassis due to delays and holding experimental parts. | 17th Nov 1932 | Box 163 \ 6 img240 | |
| Alterations to a faulty switchbox lock on chassis GAU-14. | 17th Nov 1932 | Box 163 \ 6 img241 | |
| Reassigning an experimental three-charge dynamo scheme from chassis GHW-58 to GAW-3. | 22th Nov 1932 | Box 163 \ 6 img242 | |
| Arranging the urgent fitting of a new switchbox and thermostat springs to a car. | 22th Nov 1932 | Box 163 \ 6 img243 | |
| Telegram confirmation regarding holding car GAU-14 for the fitting of a switchbox and thermostat spring. | 22th Nov 1932 | Box 163 \ 6 img244 | |
| Work required on chassis GAU-14 during its sales trials, including electrical and mechanical adjustments. | 23th Nov 1932 | Box 163 \ 6 img245 | |
| Confirming the average control brush angle for D.SCH.529 dynamos. | 24th Nov 1932 | Box 163 \ 6 img246 | |
| The fitting of an experimental three-charge dynamo scheme to chassis GAW.3. | 30th Nov 1932 | Box 163 \ 6 img247 | |
| Letter from a battery supplier regarding issues with batteries running down on 25 HP cars. | 19th Dec 1932 | Box 163 \ 6 img248 | |
| Query regarding the new type three-charge box fitted to cars GAU-14 and GHW-76 and its intended use on other vehicles. | 21th Dec 1932 | Box 163 \ 6 img249 | |
| The status of the 20/25 three-rate charge scheme on various experimental car chassis. | 22th Dec 1932 | Box 163 \ 6 img250 | |
| Letter to the National Accumulator Co. Ltd regarding battery charging issues and dynamo field resistance on the 20/25 HP chassis. | 29th Dec 1932 | Box 163 \ 6 img251 | |
| Notice about the dangerous practice of short-circuiting the dynamo field resistance on the 20/25 chassis. | 29th Dec 1932 | Box 163 \ 6 img252 | |
| Complaints of inadequate daytime charging rates for the 20/25 HP chassis. | 31th Dec 1932 | Box 163 \ 6 img253 | |
| The 'Half-Charge Scheme' on 20/25 HP models, detailing the risks of modifying the dynamo field resistance. | 3rd Jan 1933 | Box 163 \ 6 img254 | |
| Standardization of field resistance for the half-charge scheme on 25 HP models. | 4th Jan 1933 | Box 163 \ 6 img255 | |
| Production test specifications for the 20/25 three-rate charge scheme. | 6th Jan 1933 | Box 163 \ 6 img256 | |
| Specification for production inspection and testing of a 20/25 HP Dynamo. | 2nd Feb 1933 | Box 163 \ 6 img257 | |
| Procedure for running and insulation tests on a dynamo, including bedding of brushes. | 2nd Feb 1933 | Box 163 \ 6 img258 | |
| Production inspection, adjustment, and testing specification for the distribution box and cutout. | 2nd Feb 1933 | Box 163 \ 6 img259 | |
| Test procedures for a dynamo and distribution box, detailing cold operation and charging current tests. | 2nd Feb 1933 | Box 163 \ 6 img260 | |
| Procedure for testing the dynamo speed and cutout contacts based on ammeter readings. | 12th Jan 1933 | Box 163 \ 6 img261 | |
| Production test for a standard two-charge 20/25 dynamo using a smaller field resistance unit. | 12th Jan 1933 | Box 163 \ 6 img262 | |
| Requesting a reply regarding the three charge scheme on trials chassis GAW-3, with a handwritten response. | 26th Jan 1933 | Box 163 \ 6 img263 | |
| Confirming a change in resistance for the three-rate charge system on the 20/25 HP Chassis. | 31th Jan 1933 | Box 163 \ 6 img264 | |
| Test report on the dynamo charging system for Chassis No. GAW 3. | 3rd Feb 1933 | Box 163 \ 6 img265 | |
| Requesting a resoldered armature for a standard 20/25 three-rate charge dynamo. | 8th Feb 1933 | Box 163 \ 6 img266 | |
| Request for speedometer readings and dynamo performance feedback for chassis GLN-60. | 15th Feb 1933 | Box 163 \ 6 img267 | |
| Dynamo performance and three-rate charge scheme on chassis GLN-60. | 20th Feb 1933 | Box 163 \ 6 img268 | |
| Attaching the production specification for a new field resistance unit for the Standard 20/25 Three Rate Charge Dynamo. | 23th Feb 1933 | Box 163 \ 6 img269 | |
| Production inspection and test specification for a 20/25 dynamo field resistance unit. | 23th Feb 1933 | Box 163 \ 6 img270 | |
| Page from a test procedure detailing electrical and physical inspection steps. | 27th Feb 1933 | Box 163 \ 6 img271 | |
| Request for performance curves of the 'Phantom' and 20/25 HP dynamos under different conditions. | 27th Feb 1933 | Box 163 \ 6 img272 | |
| Production specification of inspection and test for a new switchbox in connection with the Standard 20/25 Three Rate Charge Scheme. | 28th Feb 1933 | Box 163 \ 6 img273 | |
| Specification of test for the 20/25 Switchbox. | 28th Feb 1933 | Box 163 \ 6 img274 | |
| Page of instructions for testing an electrical lighting circuit. | 15th Mar 1933 | Box 163 \ 6 img275 | |
| Alteration to the control brush position on a Three Rate Charge Dynamo for a 20/25 HP Chassis. | 15th Mar 1933 | Box 163 \ 6 img276 | |
| Control brush setting for a 20/25HP chassis three-rate charge dynamo. | 17th Mar 1933 | Box 163 \ 6 img277 | |
| Standardisation of a dynamo, switchbox, and distribution board for a three-charge scheme. | 29th Nov 1932 | Box 163 \ 6 img278 | |
| Form for the standardisation of a chassis part, including fitting details, costs, and an approval log. | 12th Nov 1932 | Box 163 \ 6 img279 | |
| The three-rate charge system and dynamo output curves for the standard 20/25 chassis, starting with the X series. | 4th May 1933 | Box 163 \ 6 img280 | |
| Performance graph plotting dynamo ampere output against dynamo speed and chassis M.P.H. | 4th May 1933 | Box 163 \ 6 img281 | |
| Graph of Dynamo output curves for a 3-rate charge scheme. | 4th May 1933 | Box 163 \ 6 img282 | |
| Draft leaflet for the 20/25 Chassis Handbook No. XIV, specifically about the three-charge rate scheme. | 16th Jun 1933 | Box 163 \ 6 img283 | |
| Insert for the 20/25 HP Chassis Handbook detailing a revised wiring diagram and switchbox modifications. | 16th Jun 1933 | Box 163 \ 6 img284 | |
| Description of the conditions for achieving maximum, normal/Winter, and reduced/Summer electrical charging rates. | 19th Jun 1933 | Box 163 \ 6 img285 | |
| Review of a leaflet for the 20/25 Chassis Handbook No. XIV regarding the three-rate charge scheme and wiring diagram. | 19th Jun 1933 | Box 163 \ 6 img286 | |
| Order for a Zenite resistance unit. | 9th Jan 1934 | Box 163 \ 6 img287 | |
| Request to manufacture six Ballast Resistances for the 'Spectre' project. | 20th Feb 1934 | Box 163 \ 6 img288 | |
| Order for 'Zenito' Resistances for Kestrel Flexible Dynamo Test on Aero Engine Test Beds. | 1st Apr 1934 | Box 163 \ 6 img289 | |
| The purchase of two dynamo load variable resistances. | 11th Jan 1935 | Box 163 \ 6 img290 | |
| Dynamo field resistances and proposed modifications for production machines. | 26th Feb 1935 | Box 163 \ 6 img291 | |
| Request to order Ferranti wire wound resistances with holders. | 5th Mar 1935 | Box 163 \ 6 img292 | |
| Request to order control resistances and tumbler switches for an oscilloscope motor overhaul. | 18th Apr 1935 | Box 163 \ 6 img293 | |
| Internal request to order 48 suppressors from the Erie Resistor Co. | 21th May 1935 | Box 163 \ 6 img294 | |
| Requesting an order for six 5,000 ohms wire-wound inductive resistance components from Standard Telephones & Cables, Ltd. | 5th Nov 1935 | Box 163 \ 6 img295 | |
| Failure of a Ferranti Special Resistance on test and its return for replacement. | 21th Dec 1936 | Box 163 \ 6 img296 | |
| Request to obtain a non-inductive resistance unit for aero ignition coil shunt resistance tests. | 22th Nov 1935 | Box 163 \ 6 img297 | |
| Request from D. Napier & Son for particulars on ignition chokes for experimentation following an S.B.A.C. meeting. | 13th Jan 1936 | Box 163 \ 6 img298 | |
| Letter from The Zenith Electric Co. Ltd. regarding a resistance unit that did not meet specifications. | 14th Jan 1936 | Box 163 \ 6 img299 | |
| Letter from The Zenith Electric Company Limited regarding the supply and design of resistances. | 15th Jan 1936 | Box 163 \ 6 img300 | |
| Letter to D. Napier & Son Ltd. regarding the dispatch of two 10,000 Ohm ignition resistance units. | 15th Jan 1936 | Box 163 \ 6 img301 | |
| Specification for a non-temperature coefficient ballast resistance for two types of coils. | 5th Feb 1937 | Box 163 \ 6 img302 | |
| Request to return a Zenith variable resistance for repair after it was burnt out during tests. | 5th Feb 1937 | Box 163 \ 6 img303 | |
| Instruction to produce six 'Glowray' Ballast resistance units as per drawing DW.296. | 28th Jun 1937 | Box 163 \ 6 img304 | |
| Invoice from Joseph Lucas Ltd for a VCMA-2 Unit and requesting instructions for payment. | 5th Nov 1937 | Box 163 \ 6 img305 | |
| Invoice from Joseph Lucas Ltd. for a VCMA-2 sample unit and a request for a covering order. | 26th Nov 1937 | Box 163 \ 6 img306 | |
| Request to arrange a covering order for a VCMA-2 unit obtained from Lucas as a sample. | 30th Nov 1937 | Box 163 \ 6 img307 | |
| Order for a VCMA-2 unit from Joseph Lucas Ltd., referencing a previous memo and invoice. | 1st Dec 1937 | Box 163 \ 6 img308 | |
| Request to obtain a catalogue for toroidal wound potentiometers and resistances. | 6th Nov 1940 | Box 163 \ 6 img309 | |
| Differences in behaviour between RR and Remy battery ignition contact points, suspecting mechanical stiffness as the cause. | 6th Jan 1927 | Box 163 \ 7 img001 | |
| Potential use of a Delco ignition system as a replacement for magnetos on an aero engine. | 13th Apr 1918 | Box 163 \ 7 img002 | |
| Letter concerning the temporary fitment and testing of Delco ignition systems on the Rolls-Royce Eagle engine. | 23th Sep 1918 | Box 163 \ 7 img003 | |
| Liberty engines, discussing service issues with magnetos, battery ignition, and the development of components like starting switches and voltage regulators. | 23th Sep 1918 | Box 163 \ 7 img004 | |
| Letter discussing production delays, parts shipments, and communication with Dayton Engineering Laboratories regarding ignition tests on an aviation engine. | 23th Sep 1918 | Box 163 \ 7 img005 | |
| Trouble with an ignition system fitted to an Allied 12-cylinder engine and details for contacting the Delco Chief Engineer. | 30th May 1918 | Box 163 \ 7 img006 | |
| Modifications and performance of a battery ignition distributor. | 30th May 1918 | Box 163 \ 7 img007 | |
| Delco battery ignition systems for aero engines, covering experiments, benefits, and starting procedures. | 30th May 1918 | Box 163 \ 7 img008 | |
| The dangers of hand-starting 4-bladed propellers and advocating for the safer switch-start method. | 30th May 1918 | Box 163 \ 7 img009 | |
| Improvements to a battery ignition system, including a cure for back-firing, and comparing it with a Remy ignition. | 30th May 1918 | Box 163 \ 7 img010 | |
| Letter discussing descriptive sheets and technical details for the Delco Ignition system. | 2nd Oct 1918 | Box 163 \ 7 img011 | |
| Receipt of Delco Ignition Gear Sets from America and their dispatch to the Experimental Department. | 4th Nov 1918 | Box 163 \ 7 img012 | |
| On the U.S.A. Bosch Battery Ignition system, its materials, and a note on Delco's supply conditions. | 24th Feb 1921 | Box 163 \ 7 img013 | |
| List of questions for Mr. Royce regarding issues with battery ignition systems and comparisons to competitors. | 3rd Mar 1921 | Box 163 \ 7 img014 | |
| Material used for Delco distributor tracks, clarifying a switch from Bakelite to hard rubber. | 9th Apr 1921 | Box 163 \ 7 img015 | |
| State of electrical accessories, comparing Delco to American Bosch, and considering in-house manufacturing. | 9th Apr 1921 | Box 163 \ 7 img016 | |
| Pre-ignition issues caused by mutual induction between the battery and magneto ignition systems. | 11th Apr 1921 | Box 163 \ 7 img017 | |
| Request for copies of any reports written by Mr. Royce regarding the Delco Ignition System. | 28th Apr 1921 | Box 163 \ 7 img018 | |
| Responding to a request for information on Delco Ignition systems. | 4th May 1921 | Box 163 \ 7 img019 | |
| Letter discussing the sourcing of dynamos from America and the decision to move away from vibrator regulators. | 9th Apr 1921 | Box 163 \ 7 img020 | |
| The disappointing supply of dynamos and a recommendation to use the Delco company for electrical equipment. | 4th May 1921 | Box 163 \ 7 img021 | |
| Internal query regarding the capacity and construction of a Delco Packard condenser for the Goshawk II engine. | 30th May 1921 | Box 163 \ 7 img022 | |
| Persistent faults found in the electrical equipment of the 40/50 chassis. | 7th Jun 1921 | Box 163 \ 7 img023 | |
| Report comparing the reliability of Delco electrical equipment on a Marmon car with other systems over 5000 miles. | 7th Jun 1921 | Box 163 \ 7 img024 | |
| Production delays and quality control, proposing to scrap parts to avoid sending out cars with known faults. | 1st Jun 1921 | Box 163 \ 7 img025 | |
| From Mr. Olley discussing Mr. Royce's reports on ignition systems and the quality of American electrical equipment. | 1st Jun 1921 | Box 163 \ 7 img026 | |
| The performance and issues with Delco battery ignition systems, referencing correspondence with Mr. Royce. | 19th May 1921 | Box 163 \ 7 img027 | |
| Reliability of Delco electrical equipment and proposing a direct-driven generator for the 40/50 chassis. | 1st Jun 1921 | Box 163 \ 7 img028 | |
| Examination of a Delco Packard ignition condenser removed from a Packard car. | 18th Jun 1921 | Box 163 \ 7 img029 | |
| Continued memorandum on condenser construction, capacity, and leakage. | 16th Jun 1921 | Box 163 \ 7 img030 | |
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