| Description | Date | Identifier | |
| Internal order request for dynamo brushes from two different suppliers. | 5th Aug 1936 | Box 166 \ 1 img081 | |
| Requesting a report on different makes of Carbon Brushes for Starter Motors and Dynamos. | 5th Nov 1936 | Box 166 \ 1 img082 | |
| The revised Dynamo Brush Holders for all chassis, referencing a new blueprint. | 15th Sep 1936 | Box 166 \ 1 img083 | |
| Revised brush holder for the Phantom III Dynamo, R.R. Scheme 988. | 24th Sep 1936 | Box 166 \ 1 img084 | |
| Request to supply and prepare a Phantom III dynamo for testing a revised brushholder design. | 3rd Nov 1936 | Box 166 \ 1 img085 | |
| The abandonment of testing carbon brushes from British Carbons Ltd. | 7th Nov 1936 | Box 166 \ 1 img086 | |
| Request for the overhaul of a Brush-Test Dynamo S.F.1 for further bench tests. | 24th Nov 1936 | Box 166 \ 1 img087 | |
| Letter agreeing to a twelve-month contract for parts with The Morgan Crucible Co. Ltd. | 26th Nov 1936 | Box 166 \ 1 img088 | |
| Letter sent to The Morgan Crucible Co. suggesting a twelve-month contract for carbon brushes. | 26th Nov 1936 | Box 166 \ 1 img089 | |
| Requesting the arrangement to fit experimental Le-Carbone bushes to the dynamos of several cars. | 2nd Dec 1930 | Box 166 \ 1 img090 | |
| Request to fit experimental Morganite grade EG.12 brushes to the dynamos of specific cars. | 2nd Dec 1936 | Box 166 \ 1 img091 | |
| Order request for dynamo brushes from the Morgan Crucible Co for Merlin, EXE, and Vulture Dynamos. | 5th Mar 1937 | Box 166 \ 1 img092 | |
| Letter from The Morgan Crucible Company discussing their laboratory test results on nickel-copper alloy rings compared to pure copper rings. | 5th Mar 1937 | Box 166 \ 1 img093 | |
| Letter from The Morgan Crucible Company regarding the performance of brushes on commutators and advising against material changes without testing. | 5th Mar 1937 | Box 166 \ 1 img094 | |
| Letter from supplier Le Carbone Ltd. to Bentley Motors requesting details of Dynamo & Starter Carbon Brushes for their latest car models. | 5th Apr 1937 | Box 166 \ 1 img095 | |
| Letter to Le Carbone Ltd. detailing the grades of brushes used on the dynamo and motor of a Bentley chassis. | 9th Apr 1937 | Box 166 \ 1 img096 | |
| Letter to Le Carbone Ltd. confirming drawing numbers for a Phantom III chassis and enclosing drawing D.50228. | 16th Apr 1937 | Box 166 \ 1 img097 | |
| Endurance test investigating excessive brush wear on dynamos operating at high speeds. | 20th Apr 1937 | Box 166 \ 1 img098 | |
| Modifications to dynamo design to improve commutation and performance, including a new armature. | 20th Apr 1937 | Box 166 \ 1 img099 | |
| Dynamo brushes wearing down due to a thick black gummy deposit. | 11th Apr 1937 | Box 166 \ 1 img100 | |
| Deepening the slots on dynamo brush holders to increase brush life. | 24th May 1937 | Box 166 \ 1 img101 | |
| Letter to a supplier regarding overheating failures and a lack of temperature compensation on a combined dynamo cut out and regulator. | 24th Jun 1937 | Box 166 \ 1 img102 | |
| Component performance and failure conditions during a series of road tests at varying temperatures. | 14th Jul 1937 | Box 166 \ 1 img103 | |
| Letter from The Morgan Crucible Company Ltd. arranging a meeting for the 19th of July. | 14th Jul 1937 | Box 166 \ 1 img104 | |
| Failures of experimental dynamo brushes on chassis B-23-AE, requesting they be replaced with the standard type. | 1st Aug 1937 | Box 166 \ 1 img105 | |
| Request to obtain replacement brushes for a Lucas R.R. Type Dynamo for testing. | 9th Sep 1937 | Box 166 \ 1 img106 | |
| Request for cost figures for cast aluminium brushholders and a spring. | 9th Nov 1937 | Box 166 \ 1 img107 | |
| Sales letter from Synthetic Carbon & Engineering Company Ltd. recommending their carbon products and services. | 11th Jul 1938 | Box 166 \ 1 img108 | |
| Advertisement for 'Syncarbon' brushes for electric motors and dynamos. | 11th Jul 1938 | Box 166 \ 1 img109 | |
| Specification sheet for 'Syncarbon' brush grades detailing their properties and applications. | 11th Jul 1938 | Box 166 \ 1 img110 | |
| Advertisement for 'Syncarbon' brush holders by Synthetic Carbon & Engineering Company, Ltd. | 11th Jul 1938 | Box 166 \ 1 img111 | |
| Advertisement for various copper contact parts, segments, and contactor tips. | 24th Aug 1938 | Box 166 \ 1 img112 | |
| The manufacturing process for experimental bronze type brush gear, highlighting a conflict between surface flatness and removing machine marks. | 24th Aug 1938 | Box 166 \ 1 img113 | |
| Letter to Morgan Crucible Co. Ltd. regarding testing and ordering of various grades of brushes for car dynamos. | 29th Nov 1938 | Box 166 \ 1 img114 | |
| Letter from The Morgan Crucible Company regarding the supply of specific 'Link' type brushes to improve silent running. | 6th Dec 1938 | Box 166 \ 1 img115 | |
| Order for experimental dynamo brushes of different grades for a new 72 coil dynamo. | 9th Dec 1938 | Box 166 \ 1 img116 | |
| Letter from Synthetic Carbon & Engineering Company Ltd. following up on a meeting and offering their products. | 17th Jan 1939 | Box 166 \ 1 img117 | |
| Requesting an order for dynamo brushes to be used on experimental cars. | 2nd Feb 1939 | Box 166 \ 1 img118 | |
| Letter from Synthetic Carbon & Engineering Company Ltd. regarding the scientific construction of their carbon brushes, components and switchgear parts. | 20th Feb 1939 | Box 166 \ 1 img119 | |
| Advertisement for 'Syncarbon' brushes for various electric motors and dynamos. | 1st Nov 1937 | Box 166 \ 1 img120 | |
| Specification sheet detailing various grades of 'Syncarbon' carbon brushes and their applications. | 1st Nov 1937 | Box 166 \ 1 img121 | |
| Advertisement for 'Syncarbon' brush holders from Synthetic Carbon & Engineering Company, Ltd. | 1st Nov 1937 | Box 166 \ 1 img122 | |
| Advertisement for a range of copper contact parts from Synthetic Carbon & Engineering Company, Ltd. | 27th Feb 1939 | Box 166 \ 1 img123 | |
| Letter to The Morgan Crucible Co. Ltd. regarding performance issues with dynamo brushes and requesting details on a new grade. | 27th Feb 1939 | Box 166 \ 1 img124 | |
| Letter from The Morgan Crucible Company discussing the properties of different dynamo brush materials. | 7th Mar 1939 | Box 166 \ 1 img125 | |
| Investigation report on the cause of brush noise on a 72 coil dynamo. | 6th Apr 1939 | Box 166 \ 1 img126 | |
| Analysis of the properties of micanite material after undergoing heating tests. | 6th Apr 1939 | Box 166 \ 1 img127 | |
| Incorrect purchase of mica for a 72 coil dynamo and proposing new testing procedures. | 19th Apr 1939 | Box 166 \ 1 img128 | |
| Bench comparative tests for dynamo bearing lubrication, comparing grease versus oil. | 21th Apr 1939 | Box 166 \ 1 img129 | |
| Bearing failure caused by oil choking from accumulated brush dust, suggesting sealed bearings as a better solution. | 21th Apr 1939 | Box 166 \ 1 img130 | |
| Letter from Synthetic Carbon & Engineering Company Ltd. offering their electrical components and services. | 8th May 1939 | Box 166 \ 1 img131 | |
| Reference note pointing to previous correspondence regarding British Carbon's brushes. | 1st Jan 1931 | Box 166 \ 1 img132 | |
| Confirmation of a request to obtain a list and prices for carbon brushes from the British Carbon Co. | 2nd Sep 1932 | Box 166 \ 1 img133 | |
| Confirming the urgent receipt of two dozen carbon brushes for a variable speed motor. | 27th Sep 1941 | Box 166 \ 1 img134 | |
| Complaining about experimental C.A.V. voltage regulators not meeting the specified current. | 8th May 1935 | Box 166 \ 2 img001 | |
| Letter to Scintilla, Ltd. detailing required alterations to a dynamo regulator. | 19th Jun 1935 | Box 166 \ 2 img002 | |
| Page two of a letter discussing performance issues and requirements for a dynamo voltage regulator. | 6th Sep 1935 | Box 166 \ 2 img003 | |
| Letter to Messrs. Scintilla, Ltd. requesting an update on the progress of an experimental voltage regulator. | 6th Sep 1935 | Box 166 \ 2 img004 | |
| Letter from Scintilla Limited regarding the alteration and forwarding of a regulator. | 10th Sep 1935 | Box 166 \ 2 img005 | |
| Attaching the specification for the inspection and testing of a new combined cut-out and regulator unit. | 17th Sep 1935 | Box 166 \ 2 img006 | |
| Specification for the production inspection, adjustment, and testing of a cutout and regulator unit. | 17th Sep 1935 | Box 166 \ 2 img007 | |
| Test procedure for a dynamo cutout, detailing connections, operating conditions, and expected readings. | 17th Sep 1935 | Box 166 \ 2 img008 | |
| Procedure for testing the dynamo and cutout system functionality. | 17th Sep 1935 | Box 166 \ 2 img009 | |
| The specifications and mounting instructions for a regulator and its resistance unit. | 17th Sep 1935 | Box 166 \ 2 img010 | |
| Instructions for the installation and testing of a regulator unit, including an open circuit volts test. | 17th Sep 1935 | Box 166 \ 2 img011 | |
| Test procedures for a dynamo and regulator with specified voltage and current outputs. | 17th Sep 1935 | Box 166 \ 2 img012 | |
| Note on observing the standard chassis ammeter's needle swing. | 15th Jul 1935 | Box 166 \ 2 img013 | |
| Electrical wiring diagram for a motor circuit with a control box. | 15th Jul 1935 | Box 166 \ 2 img014 | |
| Letter to The Synthetic Carbon & Engineering Co. Ltd. acknowledging receipt of brushes for testing. | 18th Sep 1935 | Box 166 \ 2 img015 | |
| Letter to Joseph Lucas Ltd. complaining about the lack of development in voltage regulators. | 20th Sep 1935 | Box 166 \ 2 img016 | |
| Page from a letter discussing radio interference issues and improvements to the R.R. C.A.V. regulator. | 26th Sep 1935 | Box 166 \ 2 img017 | |
| Letter from Joseph Lucas Limited regarding the feasibility of applying a new regulator design to existing voltage control equipment. | 26th Sep 1935 | Box 166 \ 2 img018 | |
| Letter from Joseph Lucas Ltd. regarding suppressing regulators fitted to Bentley cars. | 6th Nov 1935 | Box 166 \ 2 img019 | |
| Modifications required for an electrical cutout for the Phantom III chassis, including a list of parts. | 14th Nov 1935 | Box 166 \ 2 img020 | |
| Serious failure of a Dynamo Voltage Regulator on Sir Edmond Crane's car, GRF-9. | 14th Nov 1935 | Box 166 \ 2 img021 | |
| Recommendation to modify a resistance unit to prevent it from causing a fire and notes on a sealed regulator unit. | 14th Nov 1935 | Box 166 \ 2 img022 | |
| Letter to C.A.V. Bosch Ltd. regarding performance issues with their regulators. | 23th Jan 1936 | Box 166 \ 2 img023 | |
| Letter to Scintilla Ltd. regarding modifications and testing of voltage regulators for dynamos. | 23th Jan 1936 | Box 166 \ 2 img024 | |
| Invoice from Scintilla Ltd. for a regulator type XM.240W. | 26th Feb 1936 | Box 166 \ 2 img025 | |
| Request to place an order for a Scintilla Dynamo Regulator which was sent for testing. | 27th Feb 1936 | Box 166 \ 2 img026 | |
| Letter to C.A.V.-Bosch, Ltd. requesting a representative visit the Works Laboratory to examine a faulty regulator. | 27th Jan 1936 | Box 166 \ 2 img027 | |
| Letter from Scintilla Limited regarding voltage regulators and a potential visit from Mr. Berger. | 6th Feb 1936 | Box 166 \ 2 img028 | |
| Letter from Scintilla Limited regarding the dispatch of a dynamo regulator for testing and a proposed visit. | 19th Feb 1936 | Box 166 \ 2 img029 | |
| Advice note from Scintilla Ltd. regarding the dispatch of a regulator. | 20th Feb 1936 | Box 166 \ 2 img030 | |
| Letter to J Lucas Ltd. requesting a diagram for a new American combined current and voltage regulator. | 3rd Apr 1936 | Box 166 \ 2 img031 | |
| Letter from Joseph Lucas Ltd. discussing a drawing of Delco Remy generator connections and voltage regulator arrangements. | 6th Apr 1936 | Box 166 \ 2 img032 | |
| Confirming the dispatch of one Scintilla Voltage Regulator, complete with cut-out. | 22th Apr 1936 | Box 166 \ 2 img033 | |
| Acknowledging a request for parts, confirming communication with the Scintilla Company, and clarifying shipping and import duty options. | 16th Apr 1936 | Box 166 \ 2 img034 | |
| Extended bench test of a Scintilla voltage regulator. | 13th May 1936 | Box 166 \ 2 img035 | |
| Recommendation for a redesigned regulator with larger proportions and adjustable contacts. | 19th May 1936 | Box 166 \ 2 img036 | |
| Proceeding with the design of a Scintilla regulator and initiating a patent search. | 19th May 1936 | Box 166 \ 2 img037 | |
| List of parts and blueprint details for a Merlin 'E' Ignition Dynamo modified regulator. | 19th Jun 1936 | Box 166 \ 2 img038 | |
| Instruction to fit a battery ignition regulator to Vulture and Exe dynamos. | 20th Jun 1936 | Box 166 \ 2 img039 | |
| List of new parts required for a multi-stage voltage regulator bench test for all chassis. | 20th Jun 1936 | Box 166 \ 2 img040 | |
| Parts list with corresponding quantities and material specifications. | 20th Jun 1936 | Box 166 \ 2 img041 | |
| Parts list for terminals, wood screws, and other required components for a bench test. | 20th Jun 1936 | Box 166 \ 2 img042 | |
| Requesting an expedited report on modified Lucas Voltage Regulators to secure a cost saving. | 6th Jul 1936 | Box 166 \ 2 img043 | |
| Letter to Joseph Lucas Ltd. confirming arrangements for the trial of regulators, horns, and other components. | 22th Aug 1936 | Box 166 \ 2 img044 | |
| The supply and modification of voltage regulators. | 8th Jul 1936 | Box 166 \ 2 img045 | |
| Experiments on voltage regulators and ordering requirements for various chassis series. | 21th Sep 1936 | Box 166 \ 2 img046 | |
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