| Description | Date | Identifier | |
| Results of an efficiency test on a BXRE5 Chloride battery after 20 discharge and charge cycles. | 28th Jan 1922 | Box 49 \ 5 Scan326 | |
| Letter regarding a new contract for the supply of 'Exide' starter batteries for 40-50 Rolls-Royce cars. | 6th Feb 1922 | Box 49 \ 5 Scan327 | |
| Letter from The Chloride Electrical Storage Co. Ltd. regarding a contract for 'Exide' batteries. | 15th May 1922 | Box 49 \ 5 Scan328 | |
| Specific information to diagnose the cause of Exide battery failures. | 15th May 1922 | Box 49 \ 5 Scan329 | |
| Exide battery performance, liability for additional electrical fittings, and a disagreement with the Paris representative. | 15th May 1922 | Box 49 \ 5 Scan330 | |
| Battery service dispute regarding a new versus a renewal battery for a customer. | 28th Aug 1922 | Box 49 \ 5 Scan331 | |
| Letter from The Chloride Electrical Storage Co. Ltd. regarding a battery service misunderstanding and clarifying replacement procedures. | 25th Aug 1922 | Box 49 \ 5 Scan332 | |
| Comparison between the proposed P & R BD.11 battery and the standard Exide 6BXFD battery for the 40/50 chassis. | 21th Nov 1922 | Box 49 \ 5 Scan333 | |
| Comparison of the Exide and P & R batteries, detailing their weight, dimensions, and general features. | 2nd Nov 1922 | Box 49 \ 5 Scan334 | |
| Internal request for two standard Exide batteries for experiments with an oscilloscope. | 8th May 1923 | Box 49 \ 5 Scan335 | |
| Report from the Chloride Co. regarding the failure of an Exide Battery's negative plates. | 13th Jun 1923 | Box 49 \ 5 Scan336 | |
| Battery faults and potential solutions for the 40/50 chassis. | 28th Sep 1923 | Box 49 \ 5 Scan337 | |
| Continued discussion on battery weight distribution and design, referencing the Exide case. | 28th Sep 1923 | Box 49 \ 5 Scan338 | |
| EFC to Wd. requesting an order for 40/50 Exide batteries for experimental cars. | 12th Oct 1923 | Box 49 \ 5 Scan339 | |
| The hard and gritty state of negative plates in Exide batteries sent for repair. | 25th Oct 1922 | Box 49 \ 5 Scan340 | |
| Requesting three standard Exide BXRE5 cells for a special experiment. | 11th Nov 1923 | Box 49 \ 5 Scan341 | |
| Letter from Chloride Electrical Storage Company regarding the examination of seven 12 volt 'Exide' batteries. | 1st Nov 1923 | Box 49 \ 5 Scan342 | |
| Concluding page of a report from a battery supplier about the quality of plates. | 5th Nov 1923 | Box 49 \ 5 Scan343 | |
| Letter quoting a report from Chloride Electrical Storage Co. Ltd. on the cause of failure in Exide batteries. | 5th Nov 1923 | Box 49 \ 5 Scan344 | |
| Arranging a visit from Mr. McKinnon of the Chloride Electrical Storage Co. Ltd. to discuss Exide Batteries. | 13th Nov 1923 | Box 49 \ 5 Scan345 | |
| Instructing the replacement of a temporary battery on chassis 4-EX. | 19th Nov 1923 | Box 49 \ 5 Scan346 | |
| Faults, service history, and re-conditioning issues concerning Exide batteries. | 23th Nov 1923 | Box 49 \ 5 Scan347 | |
| Allocation of two standard 40/50 Exide batteries for a specific job. | 1st Jan 1924 | Box 49 \ 5 Scan348 | |
| Proposed visit from The Chloride Electrical Storage Co. Ltd to discuss batteries. | 11th Mar 1924 | Box 49 \ 5 Scan349 | |
| The rescheduling of a visit from Mr. McKinnon of The Chloride Electrical Storage Co. Ltd. | 18th Mar 1924 | Box 49 \ 5 Scan350 | |
| Comparing the service performance of Peto & Radford batteries against Exide batteries. | 18th Mar 1924 | Box 49 \ 5 Scan351 | |
| Routine treatment and testing of car lighting and starting batteries. | 12th Dec 1923 | Box 49 \ 5 Scan352 | |
| Log sheet detailing the charging process, weight, and density readings for a battery. | 12th Dec 1923 | Box 49 \ 5 Scan353 | |
| Log of battery cell performance test results, including densities, charges, and amperes. | 10th Nov 1923 | Box 49 \ 5 Scan354 | |
| Electrical experimental record sheet for an Exide 6BXRE5 battery. | 10th Nov 1923 | Box 49 \ 5 Scan355 | |
| Electrical experimental record sheet for an Exide Battery 6BXRE5-FF (134). | 1st Feb 1924 | Box 49 \ 5 Scan356 | |
| Electrical experimental record sheet for an Exide 6BXRF5-DF 12V battery, tracking mileage usage. | 21th Jul 1924 | Box 49 \ 5 Scan357 | |
| The development and performance of Exide batteries for the 40/50 chassis. | 11th Oct 1924 | Box 49 \ 5 Scan358 | |
| Graph plotting electrical test results with calculated values for amperes, hours, and ampere-hours. | 2nd Jan 1924 | Box 49 \ 5 Scan359 | |
| Test chart showing the discharge performance of an Exide 6BXRE5-FF battery. | 14th Feb 1924 | Box 49 \ 5 Scan360 | |
| Battery test chart recording showing a discharge curve with calculated average amperes, hours, and ampere-hours. | 14th Apr 1924 | Box 49 \ 5 Scan361 | |
| Extract regarding the costs of post-war Bosch lighting and starting equipment. | 9th Nov 1920 | Box 50 \ 1 Scan001 | |
| Covering memo forwarding instructions regarding inherently controlled dynamos. | 25th Feb 1921 | Box 50 \ 1 Scan002 | |
| Make-or-buy decision for equipment to be considered at the next Derby Conference. | 24th Feb 1921 | Box 50 \ 1 Scan003 | |
| Providing price quotes for several types of batteries from different suppliers. | 9th Mar 1921 | Box 50 \ 1 Scan004 | |
| Cost breakdown of standard electrical units for the 40/50 HP Chassis. | 14th Mar 1921 | Box 50 \ 1 Scan005 | |
| The costs of externally sourced electrical units. | 14th Mar 1921 | Box 50 \ 1 Scan006 | |
| Current and quantity pricing for various dynamos from suppliers Lucas, Smith, and Rotax. | 14th Mar 1921 | Box 50 \ 1 Scan007 | |
| Requesting production costs for standard and experimental electrical units for RR cars. | 14th Mar 1921 | Box 50 \ 1 Scan008 | |
| Sourcing, design, and costing of electrical system components like dynamos and switchboxes. | 14th Mar 1921 | Box 50 \ 1 Scan009 | |
| Obtaining the costs for dynamos from other manufacturers. | 14th Mar 1921 | Box 50 \ 1 Scan010 | |
| Invoice costs of externally sourced electrical components. | 17th Mar 1921 | Box 50 \ 1 Scan011 | |
| Quotation from Rotax Motor Accessories Co. Ltd. for two types of dynamo lighting equipment. | 18th Mar 1921 | Box 50 \ 1 Scan012 | |
| Cost calculation for motor and dynamo mica washers for the 40/50 HP Chassis. | 23th Mar 1921 | Box 50 \ 1 Scan013 | |
| Comparative costs of electrical units and proposing experiments to reduce production costs. | 23th Sep 1921 | Box 50 \ 1 Scan014 | |
| Revised cost of Motor & Dynamo Mica Washers for the 40/50 HP chassis. | 6th Mar 1921 | Box 50 \ 1 Scan015 | |
| The updated costs of mica washers for the 'R' series chassis. | 23th Mar 1921 | Box 50 \ 1 Scan016 | |
| Note on the reduced purchase price of mica plates for armatures and historical insulation methods. | 23th Mar 1921 | Box 50 \ 1 Scan017 | |
| From EFC to Wd requesting quantity prices for electrical units ahead of a staff conference. | 30th Mar 1921 | Box 50 \ 1 Scan018 | |
| Confirming the price of an electrical cut-out received from Messrs. S. Smith & Sons Ltd. | 31th Mar 1921 | Box 50 \ 1 Scan019 | |
| Letter regarding the ordering and pricing of CAV Willard thread rubber batteries. | 31th Mar 1921 | Box 50 \ 1 Scan020 | |
| Responding to enquiries about the costs of electrical units and dynamos. | 31th Mar 1921 | Box 50 \ 1 Scan021 | |
| Quotation letter from S. Smith & Sons Limited for the supply of various dynamo models. | 30th Mar 1921 | Box 50 \ 1 Scan022 | |
| The receipt and initial assessment of new C.A.V. and Lucas cut-out samples for trial. | 5th Apr 1921 | Box 50 \ 1 Scan023 | |
| The possibility of sourcing battery ignition condensers from an outside supplier to reduce costs. | 1st Apr 1921 | Box 50 \ 1 Scan024 | |
| Cost analysis document for electrical equipment components for cars, specifically the Actuator Box and Ammeter. | 1st Apr 1921 | Box 50 \ 1 Scan025 | |
| Cost comparison of ballast resistors and various batteries, including alternatives under testing. | 1st Nov 1923 | Box 50 \ 1 Scan026 | |
| Production cost breakdown for a Battery Box (X.1304) and a Battery Ignition system (X.3129). | 1st Nov 1923 | Box 50 \ 1 Scan027 | |
| Cost comparison for a U.S.A. Bosch battery ignition and a condenser. | 10th May 1921 | Box 50 \ 1 Scan028 | |
| Page detailing the production cost of a contact breaker and distributor, and experiments on materials for contact points. | 1st Jul 1922 | Box 50 \ 1 Scan029 | |
| Comparison of electrical cut-outs from Lucas, Smith, and Bleriot, detailing prices, reliability, and test results. | 1st Jul 1922 | Box 50 \ 1 Scan030 | |
| Evaluation of a C.A.V. model D cut-out and a Lucas cut-out with a compound magnetic circuit. | 5th Apr 1921 | Box 50 \ 1 Scan031 | |
| Details on a distribution board and a Lucas dynamo, including cost, weight, and suitability. | 11th Feb 1921 | Box 50 \ 1 Scan032 | |
| Comparison of specifications and prices for Smith and Rotax dynamos. | 11th Feb 1921 | Box 50 \ 1 Scan033 | |
| Price and specification comparison for Smith dynamo models 3D and 4D. | 11th Feb 1921 | Box 50 \ 1 Scan034 | |
| Page from a report assessing the suitability of Brolt, Rushmore, C.A.V., and Peerless dynamos. | 11th Feb 1921 | Box 50 \ 1 Scan035 | |
| List of components including a Junction Box and Magnetos, with their prices, weights, and alternative options. | 11th Feb 1921 | Box 50 \ 1 Scan036 | |
| Continued list of components detailing price and weight for a Conner C.M.1 and status of a Watford magneto sample. | 4th Apr 1921 | Box 50 \ 1 Scan037 | |
| Request for the cost of material and fitting of platinum contact points for the standard battery ignition. | 4th Apr 1921 | Box 50 \ 1 Scan038 | |
| Comparing the prices and weights of various magnetos. | 11th Apr 1921 | Box 50 \ 1 Scan039 | |
| Costing memorandum for platinum contact points used in standard battery ignition systems. | 18th Apr 1921 | Box 50 \ 1 Scan040 | |
| Costs of platinum contact points and fitting for standard battery ignition. | 18th Apr 1921 | Box 50 \ 1 Scan041 | |
| Cost estimation for manufacturing a 45 slot armature dynamo for the 40/50 HP chassis. | 14th Mar 1921 | Box 50 \ 1 Scan042 | |
| Provisional cost estimation for manufacturing a switchboard assembly design. | 1st Apr 1921 | Box 50 \ 1 Scan043 | |
| Provisional cost estimate for the manufacturing of an ignition switch to assembly, drawing D.1309. | 16th Apr 1921 | Box 50 \ 1 Scan044 | |
| Provisional cost estimation for the manufacture of a Distribution Board to Assembly Drawing D.1389. | 14th Mar 1921 | Box 50 \ 1 Scan045 | |
| Letter from Rolls-Royce of America regarding the cost and suitability of Exide and Willard batteries for American winter conditions. | 26th Apr 1921 | Box 50 \ 1 Scan046 | |
| Cost comparison between the standard Lucas system and the proposed R.R. double wiring system. | 22th Apr 1921 | Box 50 \ 1 Scan047 | |
| Cost-effectiveness of manufacturing dynamos versus purchasing them from external firms. | 27th Apr 1921 | Box 50 \ 1 Scan048 | |
| Cost breakdown for a main switch, push button switch, and starter motor. | 8th Dec 1921 | Box 50 \ 1 Scan049 | |
| Prices for Goshawk II electrical equipment from various suppliers. | 8th Dec 1921 | Box 50 \ 1 Scan050 | |
| The performance of a Lucas machine and a discussion with a Rotax representative about output curve specifications. | 8th Dec 1921 | Box 50 \ 1 Scan051 | |
| Price list for Peto & Radford batteries. | 8th Feb 1922 | Box 50 \ 1 Scan052 | |
| List of quoted quantity prices for various chassis and Goshawk batteries. | 8th Feb 1922 | Box 50 \ 1 Scan053 | |
| And providing the current prices for Exide and P & R batteries for 40/50 and 20 HP chassis. | 26th Jun 1925 | Box 50 \ 1 Scan054 | |
| New sleeveless type magneto from the Watford Magneto Company, including pricing, potential savings, and testing issues. | 29th Aug 1927 | Box 50 \ 1 Scan055 | |
| Price comparison of various magnetos for 40/50 HP chassis and 12-cylinder aero engines. | 9th Sep 1927 | Box 50 \ 1 Scan056 | |
| Record of the price paid for a Marelli coil and distributor. | 31th Mar 1931 | Box 50 \ 1 Scan057 | |
| Record of the price paid for a Delco Remy coil and distributor. | 31th Mar 1931 | Box 50 \ 1 Scan058 | |
| Confidential internal memo detailing the factory costs for a list of automotive parts. | 26th Nov 1931 | Box 50 \ 1 Scan059 | |
| Cover note sending a copy of factory costs for electrical equipment. | 7th Jan 1932 | Box 50 \ 1 Scan060 | |
| Sketch for the re-arrangement of cutout contact point supports, requesting the conversion of distribution boxes for testing. | 22th Apr 1925 | Box 50 \ 1 Scan061 | |
| Instructions for modifications to the R.R. Cut-Out, including diagrams for a new supporting strip and adjustments. | 18th Apr 1925 | Box 50 \ 1 Scan062 | |
| Confirming a conversation and requesting experimental modifications to two standard distribution box cutouts. | 22th Apr 1925 | Box 50 \ 1 Scan063 | |
| Listing parts required for experiments on two types of modified cutouts. | 6th May 1925 | Box 50 \ 1 Scan064 | |
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