| Description | Date | Identifier | |
| Engagement faults with the Phantom II sequence starter motor and revised test specifications. | 26th Mar 1931 | Box 61b \ 3 scan0234 | |
| Continued report on machine testing, lubrication issues, and proposed modifications to a motor. | 26th Mar 1931 | Box 61b \ 3 scan0235 | |
| The performance of the Phantom II starter motor after a modification. | 31th Mar 1931 | Box 61b \ 3 scan0236 | |
| Modification to the Phantom II Sequence Starter Gear, which has been put in abeyance. | 2nd Apr 1931 | Box 61b \ 3 scan0237 | |
| Proposal to disconnect the Bijur oil supply system from the starter motor on the 40-50 HP Chassis and use self-lubricating bearings. | 13th Apr 1931 | Box 61b \ 3 scan0238 | |
| Inspection report on a motor fault caused by incompetent dismantling and repair of a floating bush and pinion. | 16th May 1931 | Box 61b \ 3 scan0239 | |
| Request to obtain an Austin 7 or Riley 9 starter motor for experimental adaptation to an epicyclic gear change. | 21th May 1931 | Box 61b \ 3 scan0240 | |
| Starter motor modifications and a condenser replacement for a 40/50 chassis 10,000-mile test. | 23th May 1931 | Box 61b \ 3 scan0241 | |
| The failure of a starter motor on chassis 34-XJ, detailing the investigation and cause. | 23th May 1931 | Box 61b \ 3 scan0242 | |
| Samples of an Austin Seven starter motor for a visit. | 28th May 1931 | Box 61b \ 3 scan0243 | |
| Request to overhaul and modify a sequence starter motor for a test rig. | 29th May 1931 | Box 61b \ 3 scan0244 | |
| Suggesting a test of a new aluminium bronze starter pinion for the 40-50 HP chassis to achieve a more 'ladylike' engagement. | 18th Jun 1931 | Box 61b \ 3 scan0245 | |
| Unsatisfactory performance of self-lubricated Grapholly bearings in a Phantom II starter motor. | 23th Jun 1931 | Box 61b \ 3 scan0246 | |
| Continued document page outlining suggestions for modifying a steel housing and bearing assembly. | 23th Jun 1931 | Box 61b \ 3 scan0247 | |
| Requesting the fitting of British Carbon brushes to a starter motor for a 10,000-mile test. | 23th Jun 1931 | Box 61b \ 3 scan0248 | |
| Issues found with British carbon brushes fitted to a starter motor during a 10,000-mile test. | 29th Jun 1931 | Box 61b \ 3 scan0249 | |
| Methods to waterproof the P.2 starter motor due to failures from water ingress. | 8th Jul 1931 | Box 61b \ 3 scan0250 | |
| Instruction to manufacture two D.73363 starter motor pinions for testing on a 40/50 chassis. | 12th Oct 1931 | Box 61b \ 3 scan0251 | |
| Instruction to modify the total thickness of cork washers on drawing D.52214 for a 20 HP starter motor to prevent slipping. | 13th Oct 1931 | Box 61b \ 3 scan0252 | |
| Request to fit a new aluminium bronze pinion onto a sequence starter on a test rig. | 4th Oct 1931 | Box 61b \ 3 scan0253 | |
| Ongoing slipping issues with the 25 HP starter motor and potential solutions. | 15th Oct 1931 | Box 61b \ 3 scan0254 | |
| Providing six 'Bound Brook Oil-less Bearings' bushes from Hardy Spicer for the 40-50 HP Chassis starter motor. | 23th Oct 1931 | Box 61b \ 3 scan0255 | |
| Request to trial new oil-less starter motor bearing bushes from Hardy Spicers. | 25th Oct 1931 | Box 61b \ 3 scan0256 | |
| Design for an ignition with an external primary and a cheaper sequence starter for certain chassis. | 27th Oct 1931 | Box 61b \ 3 scan0257 | |
| Samples of self-lubricated Oilite bearings for the 40/50 HP starter motor. | 28th Oct 1931 | Box 61b \ 3 scan0258 | |
| Customer complaint about a faulty starter motor for a Phantom II chassis. | 18th Nov 1931 | Box 61b \ 3 scan0259 | |
| The testing of new aluminium bronze materials for the starter motor pinion on the 40-50 HP Chassis. | 7th Dec 1931 | Box 61b \ 3 scan0260 | |
| Preliminary calculations for a 4 1/2' carcase sequence starter motor, including armature and field specifications. | 17th Dec 1931 | Box 61b \ 3 scan0261 | |
| Preliminary calculations for a 4½ inch diameter starter motor (Sequence J.3). | 17th Dec 1931 | Box 61b \ 3 scan0262 | |
| Record of a telephone conversation regarding the electrical system for the Japan III Peregrine model. | 21th Dec 1931 | Box 61b \ 3 scan0263 | |
| Record of a telephone conversation regarding the electrical system design for the Japan III and Peregrine chassis. | 21th Dec 1931 | Box 61b \ 3 scan0264 | |
| Inquiry regarding the design progress of a new two-way foot switch for a three-lamp scheme. | 13th May 1930 | Box 61b \ 3 scan0265 | |
| Design and production of a two-way foot switch for the central lamp scheme. | 6th May 1930 | Box 61b \ 3 scan0266 | |
| Proposing the in-house design of a dimming switch for L. and R.H. chassis. | 23th May 1930 | Box 61b \ 3 scan0267 | |
| Letter from Joseph Lucas Ltd regarding a characteristic curve for a Lucas C.5. 12 volt Dynamo and a sample foot-operated light switch. | 5th Jun 1930 | Box 61b \ 3 scan0268 | |
| Letter to Joseph Lucas Ltd. discussing issues with dynamo output curves and a two-way foot-operated switch. | 23th Jun 1930 | Box 61b \ 3 scan0269 | |
| Page two of a letter to Messrs. Joseph Lucas Ltd. concerning the need for a reliable high-amperage switch. | 23th Jun 1930 | Box 61b \ 3 scan0270 | |
| Letter from Joseph Lucas Limited discussing tests on a foot-operated switch and the curve of a C.5 Dynamo output. | 11th Jul 1930 | Box 61b \ 3 scan0271 | |
| Test report detailing temperature rise and output variation for a C.5. Dynamo. | 26th Jun 1930 | Box 61b \ 3 scan0272 | |
| Test report from Joseph Lucas Research Laboratories on a foot-operated dipper or changeover switch. | 8th Jul 1930 | Box 61b \ 3 scan0273 | |
| Status of a two-way foot switch design and the temporary use of a Bosch alternative. | 28th Jul 1930 | Box 61b \ 3 scan0274 | |
| Two-way foot switch design for a central lamp scheme. | 8th Aug 1930 | Box 61b \ 3 scan0275 | |
| Requesting an update on the progress of a new two-way foot switch design to replace a Bosch unit. | 14th Aug 1930 | Box 61b \ 3 scan0276 | |
| Development of a two-way foot switch for the central lamp scheme to replace a Bosch component. | 8th Aug 1930 | Box 61b \ 3 scan0277 | |
| Two-way foot switch design for a central lamp scheme. | 8th Aug 1930 | Box 61b \ 3 scan0278 | |
| Follow-up communication regarding a two-way foot switch design for a central lamp scheme. | 19th Sep 1930 | Box 61b \ 3 scan0279 | |
| Development status and personal preference for a two-way foot switch for a central lamp scheme. | 20th Sep 1930 | Box 61b \ 3 scan0280 | |
| Communication noting no further news on the design of the two-way foot switch for the central lamp scheme. | 20th Sep 1930 | Box 61b \ 3 scan0281 | |
| Two-way foot switch of R.R. design for a central lamp scheme. | 22th Sep 1930 | Box 61b \ 3 scan0282 | |
| Development of a two-way foot switch for the central lamp scheme. | 22th Sep 1930 | Box 61b \ 3 scan0283 | |
| Development of a two-way foot switch for a central lamp lighting system. | 30th Sep 1930 | Box 61b \ 3 scan0284 | |
| Special switch from the Lucas Company, intended as a potential substitute for a German-made Bosch switch for operating the 3rd Lamp. | 10th Oct 1930 | Box 61b \ 3 scan0285 | |
| Examination and critique of a Lucas Foot Switch, noting its design flaws. | 6th Oct 1930 | Box 61b \ 3 scan0286 | |
| Follow-up inquiry regarding the design of a two-way foot switch for a central lamp scheme. | 28th Oct 1930 | Box 61b \ 3 scan0287 | |
| Design and testing of a two-way foot switch for a central lamp scheme. | 31th Oct 1930 | Box 61b \ 3 scan0288 | |
| Design and testing of a two-way foot switch for a central lamp scheme. | 31th Oct 1930 | Box 61b \ 3 scan0289 | |
| Two-way foot switch for a central lamp scheme. | 25th Nov 1930 | Box 61b \ 3 scan0290 | |
| Lucas enquiry for a Central Lamp Control Switch and the search for an English replacement for the Bosch part. | 28th Nov 1930 | Box 61b \ 3 scan0291 | |
| Information regarding the Lucas Centre Lamp Control Switch. | 3rd Dec 1930 | Box 61b \ 3 scan0292 | |
| Testing of a Lucas two-way switch on an experimental chassis and the decision to postpone standardization. | 8th Dec 1930 | Box 61b \ 3 scan0293 | |
| Querying a decision on a new Lucas switch and requesting information on a two-way footswitch design. | 12th Jan 1931 | Box 61b \ 3 scan0294 | |
| Lucas and Rolls-Royce designs of a two-way switch for a central lamp scheme. | 26th Jan 1931 | Box 61b \ 3 scan0295 | |
| Design of a two-way switch for the central lamp scheme to minimise voltage loss. | 1st Mar 1931 | Box 61b \ 3 scan0296 | |
| The design and testing of a Lucas two-way switch compared to a Bosch switch. | 17th Mar 1931 | Box 61b \ 3 scan0297 | |
| Instructions and report regarding the testing and fitting of Lucas foot switches. | 20th Dec 1931 | Box 61b \ 3 scan0298 | |
| The performance and voltage drop tests of a Lucas two-way switch for a central lamp scheme. | 20th Mar 1931 | Box 61b \ 3 scan0299 | |
| Design of a switch, comparing the Lucas switch unfavourably with a Bosch two-way switch. | 20th Mar 1931 | Box 61b \ 3 scan0300 | |
| Design of a two-way switch for a central lamp scheme. | 27th Mar 1931 | Box 61b \ 3 scan0301 | |
| Testing of a Lucas two-way switch for the central lamp scheme on chassis 19-EX. | 31th Mar 1931 | Box 61b \ 3 scan0302 | |
| Replacing the instrument board-fitted Lucas dipping switch with a foot-operated switch for 25 HP dipping lamps. | 13th Nov 1931 | Box 61b \ 3 scan0303 | |
| Request to obtain a new Lucas foot-operated 'Dipper' switch for experimental car 20-EX due to repeated trouble. | 18th Jul 1932 | Box 61b \ 3 scan0304 | |
| Faulty ammeter and Lucas foot-operated changeover switch on car 20-EX. | 19th Jul 1932 | Box 61b \ 3 scan0305 | |
| Note confirming the decision to retain the foot-operated dipping switch on the Phantom II car. | 29th Jul 1932 | Box 61b \ 3 scan0306 | |
| The design adaptation of an auto switch unit for a long type distribution board and switchbox. | 25th Mar 1929 | Box 61b \ 3 scan0307 | |
| The specifications for switchboxes to work with a long distribution box and auto switch unit. | 8th May 1929 | Box 61b \ 3 scan0308 | |
| Alternative switchbox arrangements and the implementation of experimental auto charge control systems. | 8th Jul 1929 | Box 61b \ 3 scan0309 | |
| Request for three modified switchboxes to operate with long distribution boxes incorporating auto charge control switches. | 8th Dec 1930 | Box 61b \ 3 scan0310 | |
| Urging the experimental shop to proceed with instructions regarding switchboxes for auto charge control switches. | 1st Mar 1931 | Box 61b \ 3 scan0311 | |
| Cross-reference note for the 40/50 switchbox (general). | 1st Jan 1931 | Box 61b \ 3 scan0312 | |
| The alteration of a switchbox on chassis 58-GN, listing required parts and material considerations. | 1st Jan 1931 | Box 61b \ 3 scan0313 | |
| Arrangement for repairing chassis switchboxes for a customer at 'N'. | 23th May 1931 | Box 61b \ 3 scan0314 | |
| Letter arranging for a chief electrician to visit Derby to acquire knowledge on repairing chassis switchboxes. | 27th May 1931 | Box 61b \ 3 scan0315 | |
| Arranging training for an electrician on the repair of chassis switchboxes to address non-interchangeable keys. | 29th May 1931 | Box 61b \ 3 scan0316 | |
| Cover memo for the test specification of a 40/50 Switchbox. | 15th Jun 1931 | Box 61b \ 3 scan0317 | |
| Specification of test for a 40/50 switchbox. | 15th Jun 1931 | Box 61b \ 3 scan0318 | |
| Set of electrical testing procedures for a switch unit using a 12-volt battery and lamp. | 5th Jan 1932 | Box 61b \ 3 scan0319 | |
| Electrical experimental record sheet for a 40/50 Switch-box test. | 5th Jan 1932 | Box 61b \ 3 scan0320 | |
| The price paid by the Bentley Co. for a large Bosch switchbox. | 8th Mar 1932 | Box 61b \ 3 scan0321 | |
| Request for the return of a Bosch switchbox lent for inspection. | 5th May 1932 | Box 61b \ 3 scan0322 | |
| Phantom II being moved using the starter motor and a suggestion to create a full electrical cut-off when the ignition is locked. | 3rd Nov 1932 | Box 61b \ 3 scan0323 | |
| Recommendation for a key-controlled locking switchbox to secure all vehicle electrical circuits. | 8th Nov 1932 | Box 61b \ 3 scan0324 | |
| Design requirement for a new switch-box to prevent battery discharge. | 28th Dec 1932 | Box 61b \ 3 scan0325 | |
| Starter motor test curves for the Peregrine N° P.4 motor. | 7th Jan 1933 | Box 61b \ 3 scan0326 | |
| Performance graph showing test curves for the Peregrine starter motor, armature D100364. | 7th Jan 1933 | Box 61b \ 3 scan0327 | |
| Graph of performance test curves for a Bosch starter motor. | 24th Jan 1934 | Box 61b \ 3 scan0328 | |
| Note requesting an update to the switchbox test specification to prevent ignition circuit interruption. | 24th Jan 1934 | Box 61b \ 3 scan0329 | |
| Letter from American Bosch Magneto Corporation concerning sample magnetos and ignition system components. | 12th Jan 1921 | Box 61b \ 4 scan0001 | |
| Inter-office memo from American Bosch Magneto Corporation detailing the computation of governor characteristics. | 12th Jan 1921 | Box 61b \ 4 scan0002 | |
| Concluding page of a report discussing the complexity of variables and advising against a 'cut-and-try' method. | 13th Jan 1920 | Box 61b \ 4 scan0003 | |
| Mathematical procedure and equations for a ring governor. | 13th Jan 1920 | Box 61b \ 4 scan0004 | |
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