Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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DescriptionDateIdentifier
Internal order request for dynamo brushes from two different suppliers.5th Aug 1936Box 166 \ 1  img081
Requesting a report on different makes of Carbon Brushes for Starter Motors and Dynamos.5th Nov 1936Box 166 \ 1  img082
The revised Dynamo Brush Holders for all chassis, referencing a new blueprint.15th Sep 1936Box 166 \ 1  img083
Revised brush holder for the Phantom III Dynamo, R.R. Scheme 988.24th Sep 1936Box 166 \ 1  img084
Request to supply and prepare a Phantom III dynamo for testing a revised brushholder design.3rd Nov 1936Box 166 \ 1  img085
The abandonment of testing carbon brushes from British Carbons Ltd.7th Nov 1936Box 166 \ 1  img086
Request for the overhaul of a Brush-Test Dynamo S.F.1 for further bench tests.24th Nov 1936Box 166 \ 1  img087
Letter agreeing to a twelve-month contract for parts with The Morgan Crucible Co. Ltd.26th Nov 1936Box 166 \ 1  img088
Letter sent to The Morgan Crucible Co. suggesting a twelve-month contract for carbon brushes.26th Nov 1936Box 166 \ 1  img089
Requesting the arrangement to fit experimental Le-Carbone bushes to the dynamos of several cars.2nd Dec 1930Box 166 \ 1  img090
Request to fit experimental Morganite grade EG.12 brushes to the dynamos of specific cars.2nd Dec 1936Box 166 \ 1  img091
Order request for dynamo brushes from the Morgan Crucible Co for Merlin, EXE, and Vulture Dynamos.5th Mar 1937Box 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 1937Box 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 1937Box 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 1937Box 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 1937Box 166 \ 1  img096
Letter to Le Carbone Ltd. confirming drawing numbers for a Phantom III chassis and enclosing drawing D.50228.16th Apr 1937Box 166 \ 1  img097
Endurance test investigating excessive brush wear on dynamos operating at high speeds.20th Apr 1937Box 166 \ 1  img098
Modifications to dynamo design to improve commutation and performance, including a new armature.20th Apr 1937Box 166 \ 1  img099
Dynamo brushes wearing down due to a thick black gummy deposit.11th Apr 1937Box 166 \ 1  img100
Deepening the slots on dynamo brush holders to increase brush life.24th May 1937Box 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 1937Box 166 \ 1  img102
Component performance and failure conditions during a series of road tests at varying temperatures.14th Jul 1937Box 166 \ 1  img103
Letter from The Morgan Crucible Company Ltd. arranging a meeting for the 19th of July.14th Jul 1937Box 166 \ 1  img104
Failures of experimental dynamo brushes on chassis B-23-AE, requesting they be replaced with the standard type.1st Aug 1937Box 166 \ 1  img105
Request to obtain replacement brushes for a Lucas R.R. Type Dynamo for testing.9th Sep 1937Box 166 \ 1  img106
Request for cost figures for cast aluminium brushholders and a spring.9th Nov 1937Box 166 \ 1  img107
Sales letter from Synthetic Carbon & Engineering Company Ltd. recommending their carbon products and services.11th Jul 1938Box 166 \ 1  img108
Advertisement for 'Syncarbon' brushes for electric motors and dynamos.11th Jul 1938Box 166 \ 1  img109
Specification sheet for 'Syncarbon' brush grades detailing their properties and applications.11th Jul 1938Box 166 \ 1  img110
Advertisement for 'Syncarbon' brush holders by Synthetic Carbon & Engineering Company, Ltd.11th Jul 1938Box 166 \ 1  img111
Advertisement for various copper contact parts, segments, and contactor tips.24th Aug 1938Box 166 \ 1  img112
The manufacturing process for experimental bronze type brush gear, highlighting a conflict between surface flatness and removing machine marks.24th Aug 1938Box 166 \ 1  img113
Letter to Morgan Crucible Co. Ltd. regarding testing and ordering of various grades of brushes for car dynamos.29th Nov 1938Box 166 \ 1  img114
Letter from The Morgan Crucible Company regarding the supply of specific 'Link' type brushes to improve silent running.6th Dec 1938Box 166 \ 1  img115
Order for experimental dynamo brushes of different grades for a new 72 coil dynamo.9th Dec 1938Box 166 \ 1  img116
Letter from Synthetic Carbon & Engineering Company Ltd. following up on a meeting and offering their products.17th Jan 1939Box 166 \ 1  img117
Requesting an order for dynamo brushes to be used on experimental cars.2nd Feb 1939Box 166 \ 1  img118
Letter from Synthetic Carbon & Engineering Company Ltd. regarding the scientific construction of their carbon brushes, components and switchgear parts.20th Feb 1939Box 166 \ 1  img119
Advertisement for 'Syncarbon' brushes for various electric motors and dynamos.1st Nov 1937Box 166 \ 1  img120
Specification sheet detailing various grades of 'Syncarbon' carbon brushes and their applications.1st Nov 1937Box 166 \ 1  img121
Advertisement for 'Syncarbon' brush holders from Synthetic Carbon & Engineering Company, Ltd.1st Nov 1937Box 166 \ 1  img122
Advertisement for a range of copper contact parts from Synthetic Carbon & Engineering Company, Ltd.27th Feb 1939Box 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 1939Box 166 \ 1  img124
Letter from The Morgan Crucible Company discussing the properties of different dynamo brush materials.7th Mar 1939Box 166 \ 1  img125
Investigation report on the cause of brush noise on a 72 coil dynamo.6th Apr 1939Box 166 \ 1  img126
Analysis of the properties of micanite material after undergoing heating tests.6th Apr 1939Box 166 \ 1  img127
Incorrect purchase of mica for a 72 coil dynamo and proposing new testing procedures.19th Apr 1939Box 166 \ 1  img128
Bench comparative tests for dynamo bearing lubrication, comparing grease versus oil.21th Apr 1939Box 166 \ 1  img129
Bearing failure caused by oil choking from accumulated brush dust, suggesting sealed bearings as a better solution.21th Apr 1939Box 166 \ 1  img130
Letter from Synthetic Carbon & Engineering Company Ltd. offering their electrical components and services.8th May 1939Box 166 \ 1  img131
Reference note pointing to previous correspondence regarding British Carbon's brushes.1st Jan 1931Box 166 \ 1  img132
Confirmation of a request to obtain a list and prices for carbon brushes from the British Carbon Co.2nd Sep 1932Box 166 \ 1  img133
Confirming the urgent receipt of two dozen carbon brushes for a variable speed motor.27th Sep 1941Box 166 \ 1  img134
Complaining about experimental C.A.V. voltage regulators not meeting the specified current.8th May 1935Box 166 \ 2  img001
Letter to Scintilla, Ltd. detailing required alterations to a dynamo regulator.19th Jun 1935Box 166 \ 2  img002
Page two of a letter discussing performance issues and requirements for a dynamo voltage regulator.6th Sep 1935Box 166 \ 2  img003
Letter to Messrs. Scintilla, Ltd. requesting an update on the progress of an experimental voltage regulator.6th Sep 1935Box 166 \ 2  img004
Letter from Scintilla Limited regarding the alteration and forwarding of a regulator.10th Sep 1935Box 166 \ 2  img005
Attaching the specification for the inspection and testing of a new combined cut-out and regulator unit.17th Sep 1935Box 166 \ 2  img006
Specification for the production inspection, adjustment, and testing of a cutout and regulator unit.17th Sep 1935Box 166 \ 2  img007
Test procedure for a dynamo cutout, detailing connections, operating conditions, and expected readings.17th Sep 1935Box 166 \ 2  img008
Procedure for testing the dynamo and cutout system functionality.17th Sep 1935Box 166 \ 2  img009
The specifications and mounting instructions for a regulator and its resistance unit.17th Sep 1935Box 166 \ 2  img010
Instructions for the installation and testing of a regulator unit, including an open circuit volts test.17th Sep 1935Box 166 \ 2  img011
Test procedures for a dynamo and regulator with specified voltage and current outputs.17th Sep 1935Box 166 \ 2  img012
Note on observing the standard chassis ammeter's needle swing.15th Jul 1935Box 166 \ 2  img013
Electrical wiring diagram for a motor circuit with a control box.15th Jul 1935Box 166 \ 2  img014
Letter to The Synthetic Carbon & Engineering Co. Ltd. acknowledging receipt of brushes for testing.18th Sep 1935Box 166 \ 2  img015
Letter to Joseph Lucas Ltd. complaining about the lack of development in voltage regulators.20th Sep 1935Box 166 \ 2  img016
Page from a letter discussing radio interference issues and improvements to the R.R. C.A.V. regulator.26th Sep 1935Box 166 \ 2  img017
Letter from Joseph Lucas Limited regarding the feasibility of applying a new regulator design to existing voltage control equipment.26th Sep 1935Box 166 \ 2  img018
Letter from Joseph Lucas Ltd. regarding suppressing regulators fitted to Bentley cars.6th Nov 1935Box 166 \ 2  img019
Modifications required for an electrical cutout for the Phantom III chassis, including a list of parts.14th Nov 1935Box 166 \ 2  img020
Serious failure of a Dynamo Voltage Regulator on Sir Edmond Crane's car, GRF-9.14th Nov 1935Box 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 1935Box 166 \ 2  img022
Letter to C.A.V. Bosch Ltd. regarding performance issues with their regulators.23th Jan 1936Box 166 \ 2  img023
Letter to Scintilla Ltd. regarding modifications and testing of voltage regulators for dynamos.23th Jan 1936Box 166 \ 2  img024
Invoice from Scintilla Ltd. for a regulator type XM.240W.26th Feb 1936Box 166 \ 2  img025
Request to place an order for a Scintilla Dynamo Regulator which was sent for testing.27th Feb 1936Box 166 \ 2  img026
Letter to C.A.V.-Bosch, Ltd. requesting a representative visit the Works Laboratory to examine a faulty regulator.27th Jan 1936Box 166 \ 2  img027
Letter from Scintilla Limited regarding voltage regulators and a potential visit from Mr. Berger.6th Feb 1936Box 166 \ 2  img028
Letter from Scintilla Limited regarding the dispatch of a dynamo regulator for testing and a proposed visit.19th Feb 1936Box 166 \ 2  img029
Advice note from Scintilla Ltd. regarding the dispatch of a regulator.20th Feb 1936Box 166 \ 2  img030
Letter to J Lucas Ltd. requesting a diagram for a new American combined current and voltage regulator.3rd Apr 1936Box 166 \ 2  img031
Letter from Joseph Lucas Ltd. discussing a drawing of Delco Remy generator connections and voltage regulator arrangements.6th Apr 1936Box 166 \ 2  img032
Confirming the dispatch of one Scintilla Voltage Regulator, complete with cut-out.22th Apr 1936Box 166 \ 2  img033
Acknowledging a request for parts, confirming communication with the Scintilla Company, and clarifying shipping and import duty options.16th Apr 1936Box 166 \ 2  img034
Extended bench test of a Scintilla voltage regulator.13th May 1936Box 166 \ 2  img035
Recommendation for a redesigned regulator with larger proportions and adjustable contacts.19th May 1936Box 166 \ 2  img036
Proceeding with the design of a Scintilla regulator and initiating a patent search.19th May 1936Box 166 \ 2  img037
List of parts and blueprint details for a Merlin 'E' Ignition Dynamo modified regulator.19th Jun 1936Box 166 \ 2  img038
Instruction to fit a battery ignition regulator to Vulture and Exe dynamos.20th Jun 1936Box 166 \ 2  img039
List of new parts required for a multi-stage voltage regulator bench test for all chassis.20th Jun 1936Box 166 \ 2  img040
Parts list with corresponding quantities and material specifications.20th Jun 1936Box 166 \ 2  img041
Parts list for terminals, wood screws, and other required components for a bench test.20th Jun 1936Box 166 \ 2  img042
Requesting an expedited report on modified Lucas Voltage Regulators to secure a cost saving.6th Jul 1936Box 166 \ 2  img043
Letter to Joseph Lucas Ltd. confirming arrangements for the trial of regulators, horns, and other components.22th Aug 1936Box 166 \ 2  img044
The supply and modification of voltage regulators.8th Jul 1936Box 166 \ 2  img045
Experiments on voltage regulators and ordering requirements for various chassis series.21th Sep 1936Box 166 \ 2  img046


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