| Description | Date | Identifier | |
| Modified spring drive for distributors on all cast iron engines. | 25th Apr 1939 | Box 168 \ 3 img168 | |
| The introduction of Bakelite gap plates for floorboards. | 4th Feb 1939 | Box 168 \ 3 img169 | |
| Letter to supplier Delco Remy & Hyatt Ltd. regarding a faulty contact lever on a low-mileage Wraith car. | 27th Apr 1939 | Box 168 \ 3 img170 | |
| New governor design for ignition distributors. | 10th May 1939 | Box 168 \ 3 img171 | |
| Requesting a check on the readiness and production of various ignition distributors. | 11th May 1939 | Box 168 \ 3 img172 | |
| List of modifications required to convert a B.V. No.1 unit from a Continental to a standard B.V. specification. | 11th May 1939 | Box 168 \ 3 img173 | |
| Return of 12 rejected Delco-Remy distributor shaft assemblies due to the softness of the cam. | 11th May 1939 | Box 168 \ 3 img174 | |
| Request to issue a covering order for one sample distributor from Messrs. Delco Remy & Hyatt. | 11th May 1939 | Box 168 \ 3 img175 | |
| Urgent request to obtain two 6bc w type Delco Remy distributors for 6 cylinder firing. | 11th May 1939 | Box 168 \ 3 img176 | |
| Checking the availability of ignition distributors for new engine units. | 11th May 1939 | Box 168 \ 3 img177 | |
| Requesting modifications to the Bentley V distributor to suit 7-1 pistons. | 12th May 1939 | Box 168 \ 3 img178 | |
| Inspection report for the B.80 No.3 unit following a 50-hour endurance test, listing required checks. | 15th May 1939 | Box 168 \ 3 img179 | |
| List of assembly and inspection instructions for an engine, including component checks and replacements. | 15th May 1939 | Box 168 \ 3 img180 | |
| List of required parts and identified faults, categorised into oil leaks, water leaks, and general issues. | 15th May 1939 | Box 168 \ 3 img181 | |
| The issue of blueprints for revised Governor Weights on the Bentley V 'Corniche' ignition distributor. | 25th Sep 1939 | Box 168 \ 3 img182 | |
| Ignition advance characteristics and speed curves for Bentley 60 and Bentley 80 models. | 23th May 1939 | Box 168 \ 3 img183 | |
| The limitations of control settings at different speeds. | 23th May 1939 | Box 168 \ 3 img184 | |
| The development of a governor curve for the Bentley V to suit 7-1 raised crown pistons and use of vernier control to correct for fuel variations. | 1st Jun 1939 | Box 168 \ 3 img185 | |
| Fuel detonation tests and the development of a vernier control system to counteract it. | 1st Jun 1939 | Box 168 \ 3 img186 | |
| Recommendations for engine ignition timing, governor curve, and vernier control settings based on dynamometer test results. | 1st Jun 1939 | Box 168 \ 3 img187 | |
| Graph of governor curves for the Bentley 'V' engine, comparing different piston configurations. | 1st Jun 1939 | Box 168 \ 3 img188 | |
| Graph of detonation curves on various fuels for a Bentley V engine with 7-1 R.C. pistons. | 1st Jun 1939 | Box 168 \ 3 img189 | |
| Series of graphs plotting Brake Horsepower (B.HP) against flywheel degrees B.T.D.C. at various engine speeds. | 1st Jun 1939 | Box 168 \ 3 img190 | |
| Distributor governor curve for production on a Bentley 'Y' model with 7:1 R.C. pistons. | 1st Jun 1939 | Box 168 \ 3 img191 | |
| Request to test a new characteristic governor and drive shaft for a Bentley 60 distributor. | 1st Jun 1939 | Box 168 \ 3 img192 | |
| Blueprints and requirements for new ignition distributor parts with a Vernier adjustment. | 2nd Jun 1939 | Box 168 \ 3 img193 | |
| List of blueprints for the Ignition Distributor with twin contact breakers for the Bentley V & Wraith Chassis. | 6th Jun 1939 | Box 168 \ 3 img194 | |
| Sending a Lucas Contact Breaker Assembly to J. Lucas for a new Phosphor Bronze Bush to be fitted. | 7th Jun 1939 | Box 168 \ 3 img195 | |
| Notification of new blueprints for an Ignition Governor Spring for the Bentley V 'Corniche'. | 7th Jun 1939 | Box 168 \ 3 img196 | |
| Report comparing the slipping torques of a standard taper fit versus a parallel interference fit for the Wraith distributor drive. | 8th Jun 1939 | Box 168 \ 3 img197 | |
| Scheme for the application of Vernier Control to R.R. Distributors with a flat plate type Lucas Governor. | 9th Jun 1939 | Box 168 \ 3 img198 | |
| Diagnosing an engine misfire caused by a slack distributor plate and the subsequent fix. | 10th Jun 1939 | Box 168 \ 3 img199 | |
| Instructions for inspecting and setting up No.10 Unit (14.B.V.) prior to fitting in a chassis. | 10th Jun 1939 | Box 168 \ 3 img200 | |
| The standardization of a distributor governor curve for different compression ratio pistons. | 13th Jun 1939 | Box 168 \ 3 img201 | |
| Distributor governor curve for production Bentley V engines with specific 7-1 and 6.5-1 ratio pistons. | 10th Jun 1939 | Box 168 \ 3 img202 | |
| Graph showing the governor advance curve for a distributor on a Wraith III engine. | 10th Jun 1939 | Box 168 \ 3 img203 | |
| The adjusted distributor governor characteristics for a Bentley 'Corniche' No.10 Unit. | 14th Jun 1939 | Box 168 \ 3 img204 | |
| The urgent purchase of two 8-cylinder Delco-Remy distributors. | 22th Jun 1939 | Box 168 \ 3 img205 | |
| Spring details and characteristics for the distributor and governor assembly. | 27th Jun 1939 | Box 168 \ 3 img206 | |
| Graph of the governor advance curve for an S.R. distributor, showing operating limits against RPM. | 3rd Jun 1939 | Box 168 \ 3 img207 | |
| Notice about new governor springs and frame required for the revised ignition characteristics of the Bentley V 'Corniche' ignition distributor. | 30th Jun 1939 | Box 168 \ 3 img208 | |
| Letter from Delco-Remy & Hyatt Ltd. enclosing two New Departure Handbooks as requested. | 3rd Jul 1939 | Box 168 \ 3 img209 | |
| Returning seventeen rejected Delco-Remy distributor shaft assemblies due to soft cams. | 4th Jul 1939 | Box 168 \ 3 img210 | |
| Accompanying a revised specification for ignition distributors, detailing changes to governor characteristics. | 4th Jul 1939 | Box 168 \ 3 img211 | |
| Specification for the production, inspection, adjustment, and testing of a distributor and contact breaker suitable for Wraith and Bentley V models. | 4th Jul 1939 | Box 168 \ 3 img212 | |
| Continuation of specification ELC23, detailing tests for distributor and governor components. | 4th Jul 1939 | Box 168 \ 3 img213 | |
| Specification changes for the connecting rods, bushes, and carburettor on a 12.B.V. Chassis (L.R.2) Ripple Unit. | 4th Jul 1939 | Box 168 \ 3 img214 | |
| Note on fitting an R.R. ignition distributor in place of an existing Delco unit on a Wraith model. | 4th Jul 1939 | Box 168 \ 3 img215 | |
| Letter from the Experimental Department to Delco-Remy & Hyatt Ltd. regarding a New Departure Handbook. | 5th Jul 1939 | Box 168 \ 3 img216 | |
| Letter from Delco-Remy & Hyatt Ltd regarding a New Departure ball bearing handbook. | 6th Jul 1939 | Box 168 \ 3 img217 | |
| Letter to Delco Remy & Hyatt Ltd. regarding the 'New Departure Handbook'. | 8th Jul 1939 | Box 168 \ 3 img218 | |
| Valve timing and ignition specifications for the Bentley V. Corniche. | 8th Jul 1939 | Box 168 \ 3 img219 | |
| Request to obtain three vacuum control units and a booklet from the Delco-Remy Co. Ltd. | 11th Jul 1939 | Box 168 \ 3 img220 | |
| Testing and modifying a Lucas Governor due to sluggish performance and susceptibility to contact lever pressure. | 11th Jul 1939 | Box 168 \ 3 img221 | |
| Slight modification to the characteristic of several units, including the distributor for I.F.F. | 11th Jul 1939 | Box 168 \ 3 img222 | |
| Graph showing the governor advance curve for a special Lucas governor assembly under test conditions. | 28th Jun 1939 | Box 168 \ 3 img223 | |
| Test specifications for the Wraith Ripple Unit No.2, detailing governor curves and flywheel advance settings. | 13th Jul 1939 | Box 168 \ 3 img224 | |
| Investigation into misfires on a 25.G.VI model, tracing the fault to a worn distributor bush. | 17th Jul 1939 | Box 168 \ 3 img225 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding a write-up on Vacuum Ignition Control. | 25th Jul 1939 | Box 168 \ 3 img226 | |
| Letter from the Experimental Department to Delco Remy & Hyatt Ltd. acknowledging their letter and a booklet on vacuum control. | 9th Aug 1939 | Box 168 \ 3 img227 | |
| Servicing notes for the Delco distributor on the A and B Series Wraith. | 22th Aug 1939 | Box 168 \ 3 img228 | |
| Requesting to obtain a 4-cylinder distributor unit from Lucas for endurance testing. | 3rd Nov 1939 | Box 168 \ 3 img229 | |
| Letter from Joseph Lucas Limited regarding the dispatch and delivery of various automotive components. | 17th Nov 1939 | Box 168 \ 3 img230 | |
| New lubrication scheme for the distributor drive using a specially drilled camshaft. | 9th Jan 1940 | Box 168 \ 3 img231 | |
| Inquiring about production limits for cylinder timing variation and a bent spindle. | 11th Jan 1940 | Box 168 \ 3 img232 | |
| Querying cylinder timing limits, comparing Delco/Lucas systems, and asking about a bent spindle on 4.B.50. | 11th Jan 1940 | Box 168 \ 3 img233 | |
| The accuracy and error measurements for Delco Remy Cams. | 24th Apr 1928 | Box 168 \ 3 img234 | |
| Performance and hardness of a 6-cylinder distributor cam, comparing Delco, Lucas, and in-house models. | 24th Apr 1928 | Box 168 \ 3 img235 | |
| Delco distributor performance, a bent spindle issue on part 4B50, and rotor removal instructions. | 10th Jan 1940 | Box 168 \ 3 img236 | |
| Bent distributor shafts caused by rotor removal and a revised procedure. | 10th Jan 1940 | Box 168 \ 3 img237 | |
| Bent distributor shafts due to improper rotor removal and advising a new procedure. | 17th Jan 1940 | Box 168 \ 3 img238 | |
| Letter to a supplier concerning a wartime development programme and an order for 8-cylinder distributors. | 21th Feb 1940 | Box 168 \ 3 img239 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding assistance with eight-cylinder distributors. | 26th Feb 1940 | Box 168 \ 3 img240 | |
| Redesign of B.60 & B.80 H.T. wiring tubes from round to formed flat sheet. | 28th Feb 1940 | Box 168 \ 3 img241 | |
| Letter to Delco-Remy & Hyatt Ltd. requesting the development and supply of an 8-cylinder distributor. | 7th Mar 1930 | Box 168 \ 3 img242 | |
| Letter to Delco-Remy & Hyatt Ltd. regarding the design and order of Model 662 distributors. | 15th Mar 1940 | Box 168 \ 3 img243 | |
| Governor specification for 66258U distributors, detailing advance degrees versus speed. | 13th Mar 1940 | Box 168 \ 3 img244 | |
| Letter to Delco-Remy & Hyatt Ltd. regarding the modification and order of Model 662P and 662MX2 distributors. | 13th Mar 1940 | Box 168 \ 3 img245 | |
| Governor specification for 662NX2 distributors, detailing advance degrees at various RPM speeds. | 13th Mar 1940 | Box 168 \ 3 img246 | |
| Governor specifications for B80 to DB2291. | 13th Mar 1940 | Box 168 \ 3 img247 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the supply and specifications of distributor caps. | 15th Mar 1940 | Box 168 \ 3 img248 | |
| Instructions and blueprints for new ignition high-frequency wiring components and fittings. | 19th Mar 1940 | Box 168 \ 3 img249 | |
| New drawings and instructions for ignition wire tubes, assemblies, and brackets for the B.60 3 1/4 Bore engine. | 19th Mar 1940 | Box 168 \ 3 img250 | |
| Enquiry to Delco-Remy & Hyatt regarding the supply of various distributors and spare parts. | 21th Mar 1940 | Box 168 \ 3 img251 | |
| Arrangement with Messrs. Delco-Remy to supply four 8 cylinder distributors for B.80 engines. | 21th Mar 1940 | Box 168 \ 3 img252 | |
| Arrangement for Delco-Remy to supply four 8-cylinder type distributors for B.80 engines. | 21th Mar 1940 | Box 168 \ 3 img253 | |
| Letter from Delco-Remy & Hyatt Ltd. concerning the despatch of 8-cylinder distributors. | 11th Apr 1940 | Box 168 \ 3 img254 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the despatch and specifications of distributors. | 11th Apr 1940 | Box 168 \ 3 img255 | |
| Request to distributors to obtain a condenser and contact levers for a 6 cylinder Delco distributor. | 16th Apr 1940 | Box 168 \ 3 img256 | |
| Request to obtain distributor condensers and contact levers from Delco Remy & Hyder Ltd. | 15th Apr 1940 | Box 168 \ 3 img257 | |
| Letter to Delco Remy & Hyatt Ltd. regarding various automotive electrical components such as distributors, condensers, and radio suppressors. | 16th Apr 1940 | Box 168 \ 3 img258 | |
| Request to supply missing thrust washers for six and eight-cylinder type distributors. | 19th Apr 1940 | Box 168 \ 3 img260 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the supply of condensers, contact arms, and thrust washers for distributors. | 19th Apr 1940 | Box 168 \ 3 img261 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the forwarding of four and six-cylinder ignition distributors for inspection. | 27th Apr 1940 | Box 168 \ 3 img262 | |
| Request to obtain suppression condensers and tubular fuses from Delco-Remy & Hyatt Ltd. | 31th Jan 1940 | Box 168 \ 3 img263 | |
| Request to obtain suppression condensers and tubular fuses from Delco-Remy & Hyatt Ltd. | 1st May 1940 | Box 168 \ 3 img264 | |
| Request to return loaned Delco-Remy & Hyatt distributors after examination. | 10th May 1940 | Box 168 \ 3 img265 | |
| Letter to Delco, Remy & Hyatt regarding the examination of loaned distributors and inquiries about their features for experimental engines. | 10th May 1940 | Box 168 \ 3 img266 | |
| Request to return two Delco Distributors to Delco-Remy & Hyatt Ltd. after examination. | 10th May 1940 | Box 168 \ 3 img267 | |
| Despatch note for the return of two distributors to Messrs. Delco Remy & Hyatt Ltd. | 13th May 1940 | Box 168 \ 3 img268 | |
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