| Description | Date | Identifier | |
| Road test report on Delco-Remy high-put coils, measuring resistance and temperature under different conditions. | 13th Aug 1938 | Box 164 \ 5 img379 | |
| Output tests on Delco Remy high output production coils. | 19th Jul 1938 | Box 164 \ 5 img380 | |
| Output tests on Delco-Remy high output production coils, recording gap, kilo-volts, and primary current at various distributor speeds. | 19th Jul 1938 | Box 164 \ 5 img381 | |
| Output tests on Delco-Remy High Output No. 215A coils. | 6th Jul 1938 | Box 164 \ 5 img382 | |
| Output tests on a Delco-Remy High Output No. 15A coil. | 6th Jul 1938 | Box 164 \ 5 img383 | |
| Output tests on a Delco-Remy High Output N°15A coil. | 6th Jul 1938 | Box 164 \ 5 img384 | |
| Output tests on coils. | 8th Aug 1938 | Box 164 \ 5 img385 | |
| Output test report for a Delco-Remy High Output 16A ignition coil. | 8th Aug 1938 | Box 164 \ 5 img386 | |
| Performance issues with Delco coils in Wraith cars during high temperatures and the subsequent search for a more reliable alternative. | 15th Aug 1938 | Box 164 \ 5 img387 | |
| Issues with Delco coils on Wraith cars during hot weather testing and the plan to find a replacement. | 15th Aug 1938 | Box 164 \ 5 img388 | |
| The testing and production recommendation for Wraith model ignition coils. | 20th Aug 1938 | Box 164 \ 5 img389 | |
| From Rm to Roy/Les regarding attached documents to clarify the purchase of coils. | 20th Aug 1938 | Box 164 \ 5 img390 | |
| Misfire troubles with Delco ignition coils on the Wraith model during hot weather. | 24th Aug 1938 | Box 164 \ 5 img391 | |
| Coil tests to determine maximum running temperature and performance effects. | 25th Aug 1938 | Box 164 \ 5 img392 | |
| Performance table comparing different component types, their fixing methods, maximum operating temperatures, and remarks on misfires. | 25th Aug 1938 | Box 164 \ 5 img393 | |
| Test note detailing a misfire event of a Runbaken oil-filled coil at high temperature. | 25th Aug 1938 | Box 164 \ 5 img394 | |
| Ignition coil temperature tests under hot summer conditions. | 26th Aug 1938 | Box 164 \ 5 img395 | |
| Performance comparison and recommendation of various ignition coils for the Wraith model. | 26th Aug 1938 | Box 164 \ 5 img396 | |
| Test results detailing the temperature curves for various ignition coils under different fitting conditions. | 26th Aug 1938 | Box 164 \ 5 img397 | |
| Test results for a Delco-Remy bracket and distributor coil, noting unsuitability for the Wraith model. | 26th Aug 1938 | Box 164 \ 5 img398 | |
| Graph showing the temperature of various ignition coils over time, taken on a 24 G.VI chassis. | 9th Aug 1939 | Box 164 \ 5 img399 | |
| Graph comparing the output characteristics of various ignition coils under specific test conditions. | 20th Aug 1938 | Box 164 \ 5 img400 | |
| Factory costs for Ignition Coil D.75673 and Ballast Resistance DW.296, with a note on a future price reduction. | 16th Sep 1938 | Box 164 \ 5 img401 | |
| Comparison tests between a standard and a special ignition coil. | 4th Feb 1939 | Box 164 \ 5 img402 | |
| Page 2 of a letter concerning the subjection of a coil to a specific ambient temperature. | 4th Feb 1939 | Box 164 \ 5 img403 | |
| Request for the factory costs of an ignition coil and ballast resistance. | 12th Sep 1938 | Box 164 \ 5 img404 | |
| Report on ignition coils and a decision made regarding choke springs. | 8th Feb 1939 | Box 164 \ 5 img405 | |
| The results of tests on fourteen different ignition coils. | 6th Feb 1939 | Box 164 \ 5 img406 | |
| Comparative table of performance data for various ignition coils. | 6th Feb 1939 | Box 164 \ 5 img407 | |
| Performance comparison table for a Standard Phantom III component versus a Run Baken oil-filled component. | 20th Feb 1939 | Box 164 \ 5 img408 | |
| Experimental department report on oscillograph work on chassis ignition coils. | 20th Feb 1939 | Box 164 \ 5 img409 | |
| Oscillograms showing the current through the primary circuit of a Wraith ignition coil, comparing two types of distributors. | 27th Feb 1938 | Box 164 \ 5 img410 | |
| Oscillograms showing a comparison of voltage and current curves across a spark gap for a Wraith ignition coil using R.R. and Delco Remy distributors. | 27th Feb 1939 | Box 164 \ 5 img411 | |
| Letter from Bosch detailing the wiring and functionality of a Super Energy Coil TH. | 6th Mar 1939 | Box 164 \ 5 img412 | |
| Page 2 of a letter from Bosch Limited with instructions for fitting a coil and mention of an enclosed quotation. | 3rd Mar 1939 | Box 164 \ 5 img413 | |
| Requesting the purchase of a Bosch Super Energy Coil. | 15th Mar 1939 | Box 164 \ 5 img414 | |
| Wiring diagram for a Super Energy Coil. | 2nd Mar 1939 | Box 164 \ 5 img415 | |
| On electrical development, advocating for better cooperation between experimental design and production, and outlining a process for failure investigation. | 1st Apr 1939 | Box 164 \ 5 img416 | |
| Investigation report on a Wraith ignition coil failure on WXA.99. | 1st Apr 1939 | Box 164 \ 5 img417 | |
| Experimental department report on oscillograph work on the Wraith ignition system, comparing various distributors. | 19th Apr 1939 | Box 164 \ 5 img418 | |
| Oscillograph work comparing ignition systems for the 'Wraith' model. | 19th Apr 1939 | Box 164 \ 5 img419 | |
| Analysis of ignition system waveforms, voltage peaks, misfiring, and spark energy measurements. | 19th Apr 1939 | Box 164 \ 5 img420 | |
| The performance issues of an experimental commutator distributor, focusing on arcing and low spark energy. | 5th Apr 1939 | Box 164 \ 5 img421 | |
| Comparison of Wraith primary ignition current curves for Rolls Royce and Delco-Remy distributors at 650 and 1400 RPM. | 5th Apr 1939 | Box 164 \ 5 img422 | |
| Comparison of primary ignition voltage curves for a Wraith model, comparing the company's own distributor with a Delco-Remy distributor at different RPMs. | 5th Apr 1939 | Box 164 \ 5 img423 | |
| Graph comparing ignition voltage curves for Rolls-Royce and Delco-Remy distributors under sparking and non-sparking conditions. | 5th Apr 1939 | Box 164 \ 5 img424 | |
| Commutator distributor primary current curves at different RPMs and brush settings. | 5th Apr 1939 | Box 164 \ 5 img425 | |
| Graph of Commutator Distributor Primary Voltage Curves at various RPMs and brush settings. | 5th Apr 1939 | Box 164 \ 5 img426 | |
| The wiring connections for fitting a Bosch coil to vehicle 28.G.VI. | 20th May 1939 | Box 164 \ 5 img427 | |
| Testing of a changeover switch for a Bentley ignition system and a recommendation for further trials. | 23th May 1939 | Box 164 \ 5 img428 | |
| Advice note from Joseph Lucas Limited for a sample R12 Coil. | 9th Nov 1939 | Box 164 \ 5 img429 | |
| Invoice from Joseph Lucas Ltd. for a coil, requesting instructions for payment. | 13th Dec 1939 | Box 164 \ 5 img430 | |
| To obtain one Lucas Sports Coil from Messrs. Lucas. | 13th Dec 1939 | Box 164 \ 5 img431 | |
| Most efficient winding arrangements for an ignition coil. | 13th Dec 1939 | Box 164 \ 5 img432 | |
| Test report comparing output voltage of different ignition coil wiring arrangements for positive and negative earth systems. | 13th Dec 1939 | Box 164 \ 5 img433 | |
| Covering order for a Lucas coil. | 16th Dec 1939 | Box 164 \ 5 img434 | |
| Fitting of a Lucas 'R' type coil to the 'Ripplet 2.R.2' car. | 9th Feb 1940 | Box 164 \ 5 img435 | |
| Instructions for fitting a Lucas 'R' type coil to the 'Ripplet 2.R.2.' car. | 9th Feb 1940 | Box 164 \ 5 img436 | |
| Request to obtain Bentley 60 & 80 ignition coils from Messrs. Lucas. | 21th Feb 1940 | Box 164 \ 5 img437 | |
| The mounting of the Lucas ignition coil on the dashboard for the Ripplet model. | 7th Mar 1940 | Box 164 \ 5 img438 | |
| The procurement of ignition coils from Messrs. Lucas. | 21th Feb 1942 | Box 164 \ 5 img439 | |
| The mounting of the Lucas ignition coil on the dashboard for the Ripplet model. | 7th Mar 1940 | Box 164 \ 5 img440 | |
| New drawings for ignition coil components for the L.H. Senior Range. | 24th Apr 1940 | Box 164 \ 5 img441 | |
| The failure of an in-house ignition coil on the Wraith model, the decision to fit Delco coils, and a related oil consumption issue. | 9th May 1938 | Box 164 \ 5 img442 | |
| Letter to Joseph Lucas Ltd. regarding the design and production of a new headlamp foot switch. | 18th Jan 1937 | Box 165 \ 1 img001 | |
| The fuse protection for foot switches and headlamps. | 4th Feb 1937 | Box 165 \ 1 img002 | |
| Letter from Joseph Lucas Ltd. regarding a proposed new Dipper Switch and enclosing a preliminary drawing. | 4th Feb 1937 | Box 165 \ 1 img003 | |
| Proposed layout of a foot switch with a specified diameter. | 4th Feb 1937 | Box 165 \ 1 img004 | |
| Letter to Joseph Lucas Ltd. requesting a cost estimate for 500 units of various electrical components for a Bentley Chassis. | 18th Feb 1937 | Box 165 \ 1 img005 | |
| Letter from Joseph Lucas Limited regarding a delay in sending a sample of a special Dipper Switch. | 20th Feb 1937 | Box 165 \ 1 img006 | |
| Arranging the loan of electrical units to Messrs. Lucas Ltd. | 20th Feb 1937 | Box 165 \ 1 img007 | |
| The loan of electrical units to Messrs. Lucas. | 20th Feb 1937 | Box 165 \ 1 img008 | |
| Request to draw parts to adapt a Lucas dynamo carcase to fit standard armatures and field windings. | 23th Feb 1937 | Box 165 \ 1 img009 | |
| Letter to Joseph Lucas & Co. Ltd. enclosing drawings for Bentley and 25/30 chassis components. | 23th Feb 1937 | Box 165 \ 1 img010 | |
| Letter to Joseph Lucas & Co. Ltd requesting two further foot switches for testing. | 4th Mar 1937 | Box 165 \ 1 img011 | |
| Letter to R.L. Neill of Joseph Lucas Ltd requesting the return of previously sent patent specifications. | 9th Mar 1937 | Box 165 \ 1 img012 | |
| Letter to Lagonda Motor Car Co. inquiring about the service quality from electrical equipment supplier Lucas. | 11th Mar 1937 | Box 165 \ 1 img013 | |
| Letter from Joseph Lucas Limited regarding test results of a High Tension Cable. | 13th May 1937 | Box 165 \ 1 img014 | |
| Test report on a 7mm H.T. cable submitted for testing. | 13th May 1937 | Box 165 \ 1 img015 | |
| Test results for sustained voltage, breakdown voltage, and ozone on a sample. | 13th May 1937 | Box 165 \ 1 img016 | |
| Research laboratory report on the effects of petrol, oil, and heat on electrical cables. | 15th Mar 1937 | Box 165 \ 1 img017 | |
| Visit to Messrs. Lucas regarding distributor components and oscillograph equipment. | 15th Mar 1937 | Box 165 \ 1 img018 | |
| Issues with reversed polarity, transformer ignition, foot switches, and headlamps. | 15th Mar 1937 | Box 165 \ 1 img019 | |
| Letter to Joseph Lucas Ltd. regarding drawings for a coil case and top for a Bentley Chassis. | 15th Mar 1937 | Box 165 \ 1 img020 | |
| Letter to Joseph Lucas Ltd. arranging a visit from an assistant to discuss regulator modifications and experimental Bentley units. | 15th Mar 1937 | Box 165 \ 1 img021 | |
| Reasons for not using Lucas as a distributor for Bentley, citing poor quality and issues with their electrical equipment. | 16th Mar 1937 | Box 165 \ 1 img022 | |
| Ongoing issues with horns supplied by Messrs Lucas, including failures and excessive current draw. | 10th Mar 1937 | Box 165 \ 1 img023 | |
| Visit to Messrs Lucas to discuss issues with regulators and horns for the Bentley chassis. | 18th Mar 1937 | Box 165 \ 1 img024 | |
| Report discussing issues and proposed solutions for horns, headlamps, and Bentley car components. | 18th Mar 1937 | Box 165 \ 1 img025 | |
| Necessary revisions to a motor scheme, including changes to the flywheel ring, the addition of a double-reduction gear, and the design of the switchbox. | 18th Mar 1937 | Box 165 \ 1 img026 | |
| Visit to Messrs Lucas to discuss regulators, horns, and other components for the Bentley chassis. | 18th Mar 1937 | Box 165 \ 1 img027 | |
| Page 2 of a report discussing issues and progress on horns, headlamps, and Bentley car units. | 18th Mar 1937 | Box 165 \ 1 img028 | |
| Revisions to a motor scheme, including the flywheel gear and switchbox design. | 31th Mar 1937 | Box 165 \ 1 img029 | |
| Letter from Joseph Lucas Ltd. enclosing blueprints for a starter arrangement for a Bentley model. | 31th Mar 1937 | Box 165 \ 1 img030 | |
| Letter from Joseph Lucas Limited requesting a copy of drawing D.75084 for a switchbox costing. | 1st Apr 1937 | Box 165 \ 1 img031 | |
| Letter to Joseph Lucas Ltd. detailing modifications for experimental foot switches. | 11th Mar 1937 | Box 165 \ 1 img032 | |
| Letter from Joseph Lucas Limited regarding a Foot Dimmer Switch, blueprints, and flywheel gearing. | 12th Apr 1937 | Box 165 \ 1 img033 | |
| Requirement of a special Bentley flywheel gear ring for an experimental trial with Lucas electrical parts. | 14th Apr 1937 | Box 165 \ 1 img034 | |
| Letter to Joseph Lucas Ltd. regarding issues with new headlamps dithering on R.R. and Bentley chassis. | 15th Apr 1937 | Box 165 \ 1 img035 | |
| Letter to Joseph Lucas Ltd. requesting a cost estimate for a new petrol pump switch design. | 15th Apr 1937 | Box 165 \ 1 img036 | |
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