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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Performance graph plotting Brake Horsepower (B.HP) and RPM against Torque.28th May 1910Box 165 \ 7  img024
The results of C.60 cold start tests and suggesting a modified starter.28th May 1910Box 165 \ 7  img025
Gear operated from a 24V supply.28th May 1910Box 165 \ 7  img026
Calculations for starting a B60 engine at 0°F.28th May 1910Box 165 \ 7  img027
Performance and efficiency calculations for a Lucas M45G motor.28th May 1910Box 165 \ 7  img028
Cold start tests for a C6 Oil Engine using SAE10 lubricating oil.28th May 1910Box 165 \ 7  img029
Engine cold start performance data at -28°F and -30°F, with and without fuel dilution, and proposed gearing changes.1st Apr 1947Box 165 \ 7  img030
Performance curve graph for a starter motor and drive with a 110 AH battery.1st Apr 1947Box 165 \ 7  img031
Performance characteristics graph for a 12 Volt CAV S-Motor.1st Apr 1947Box 165 \ 7  img032
Performance graph for a 12 Volt CAV Starter Motor, Serial No 46260.1st Apr 1947Box 165 \ 7  img033
Photograph showing the wear on a flywheel's gear teeth after 25,000 starts.20th Jan 1950Box 165 \ 7  img034
The Lucas Electrical Helix Type Starter motor for use on B.40 engines.20th Jan 1950Box 165 \ 7  img035
Description of the operation of a multiplate friction clutch and its various disengagement mechanisms.20th Jan 1950Box 165 \ 7  img036
History of development report on Lucas Helix type motors, detailing test results and failures.20th Jan 1950Box 165 \ 7  img037
Test report on an improved motor unit after 30,000 starts and subsequent component examination.20th Jan 1950Box 165 \ 7  img038
Inspection and failure analysis report on various starter motor components.1st Jan 1950Box 165 \ 7  img039
The failure analysis of two Lucas starter motors, serial numbers 58 and 76.20th Jan 1950Box 165 \ 7  img040
The testing of two modified motors, detailing failures, diagnoses, and subsequent repairs.20th Jan 1950Box 165 \ 7  img041
The testing, faults, and modifications of a starter motor from supplier Lucas.20th Jan 1950Box 165 \ 7  img042
Report page detailing conclusions on component improvements and a list of outstanding faults.20th Jan 1950Box 165 \ 7  img043
Test report comparing sample carbon brushes from British Carbons Ltd. against the standard Morganite brushes.2nd Sep 1932Box 166 \ 1  img001
Test report on brushes, comparing their performance, wear, and cost against the standard.2nd Sep 1932Box 166 \ 1  img002
Testing and potential standardisation of starter motor and dynamo brushes supplied by British Carbons Limited.1st Sep 1932Box 166 \ 1  img003
Electrical experimental record sheet for British Carbon Brushes Grade B 40/50.23th Aug 1932Box 166 \ 1  img004
Requesting an order for various quantities and grades of British Commutator Brushes.3rd Oct 1932Box 166 \ 1  img005
Letter from The Morgan Crucible Company Ltd. regarding a schedule of qualities for electrical brushes.28th Sep 1932Box 166 \ 1  img006
Letter to British Carbons Ltd. requesting specifications for various grades of brushes received for testing.18th Oct 1932Box 166 \ 1  img007
Follow-up letter to British Carbons Ltd requesting a reply to a previous correspondence.1st Nov 1932Box 166 \ 1  img008
Letter from British Carbons enclosing full specifications for their products following tests.2nd Nov 1922Box 166 \ 1  img009
Summary of the physical properties for different grades of carbon products from British Carbons.2nd Nov 1922Box 166 \ 1  img010
Specification sheet for different grades of carbon brushes from British Carbons Limited.9th Nov 1932Box 166 \ 1  img011
Letter to British Carbons Ltd. requesting further information on special brushes sent for testing.9th Nov 1932Box 166 \ 1  img012
Request to order experimental Morganite carbon brushes for testing.9th Nov 1932Box 166 \ 1  img013
Letter from British Carbons Ltd providing particulars for carbon brush grades G.20 and G.7.10th Nov 1932Box 166 \ 1  img014
Internal memorandum requesting an order for various experimental grades of Morganite dynamo brushes.7th Feb 1933Box 166 \ 1  img015
Urgent memo seeking clarification on whether to standardize carbon brushes from British Carbons Ltd., pending information on their material composition.7th Mar 1933Box 166 \ 1  img016
Letter from British Carbons Ltd. regarding tests and the material composition of their brushes.6th Mar 1933Box 166 \ 1  img017
Letter regarding the testing of an experimental dynamo with a new grade of brushes on a Bensport vehicle.7th Mar 1933Box 166 \ 1  img018
Tests conducted to reduce excessive dynamo brush wear.8th Mar 1933Box 166 \ 1  img019
Order for Morganite Dynamo Brushes from the Morgan Crucible Co.8th Mar 1933Box 166 \ 1  img020
Internal memorandum regarding the standardization and sourcing of British Carbon Brushes.8th Mar 1933Box 166 \ 1  img021
Explaining the policy decision to switch dynamo brush suppliers from French to British.3rd Mar 1933Box 166 \ 1  img022
Suggesting the standardisation of the Morganite EGO grade brush for the 40/50 chassis.4th May 1933Box 166 \ 1  img023
The standardisation of Morganite EGO dynamo brushes for 20/25 and 40/50 models.24th May 1933Box 166 \ 1  img024
Standardisation of dynamo brushes of grade Morganite EG0 for the 20/25 dynamo.24th May 1933Box 166 \ 1  img025
Standardisation of chassis parts form for dynamo brushes to improve commutation and reduce wear.24th Feb 1933Box 166 \ 1  img026
Request to order one dozen dynamo brushes from the Morgan Crucible Co.10th Oct 1933Box 166 \ 1  img027
Urgent order for one dozen Morganite carbon brushes.7th Nov 1933Box 166 \ 1  img028
Order for Morganite dynamo brushes.7th Dec 1933Box 166 \ 1  img029
Meeting notes regarding a visit from Mr. Thompson of British Carbons Co. to discuss various brush grades.18th Dec 1933Box 166 \ 1  img030
Letter from British Carbons Ltd. regarding samples of carbon brushes to match a provided sample and a request for a specimen of a smaller brush.21th Dec 1923Box 166 \ 1  img031
Letter to The Morgan Crucible Company Ltd requesting a meeting to discuss a suitable grade of brush for a new car engine dynamo.27th Dec 1933Box 166 \ 1  img032
Letter to British Carbons Ltd. accompanying a requested sample brush.29th Dec 1933Box 166 \ 1  img033
Cover letter from The Morgan Crucible Company Ltd. enclosing a reprint of a communication.16th Jan 1934Box 166 \ 1  img034
Follow-up letter to The Morgan Crucible Company regarding the promised delivery of experimental morganite brushes for testing.13th Mar 1934Box 166 \ 1  img035
Letter from The Morgan Crucible Company Limited regarding experimental brushes.15th Mar 1934Box 166 \ 1  img036
From Morgan Crucible Company listing different types of Morganite brushes and their dimensions for trial.24th Mar 1934Box 166 \ 1  img037
Request to order four Morganite Brushes, grade CM3, to drawing DB496.24th Mar 1934Box 166 \ 1  img038
The purchase of carbon rods.6th Jun 1934Box 166 \ 1  img039
Sample 'SYN' carbon brushes for testing on a 20/25 shunt dynamo and a Bentley dynamo.28th Jun 1934Box 166 \ 1  img040
Dispatch of various carbon brushes to the WST. Exp. Dept.29th Aug 1934Box 166 \ 1  img041
Letter from The Morgan Crucible Company discussing the analysis and comparison of different brush samples.8th Dec 1934Box 166 \ 1  img042
Letter from The Morgan Crucible Company discussing the properties of Link CM5H and Link CM6, including their co-efficient of friction.8th Dec 1934Box 166 \ 1  img043
Letter to The Morgan Crucible Co. Ltd. regarding the ordering and testing of specific grades of brushes.10th Dec 1934Box 166 \ 1  img044
Internal memorandum requesting an order for various grades of Morganite brushes.10th Dec 1934Box 166 \ 1  img045
Letter to The Morgan Crucible Co. Ltd. to arrange a meeting about dynamo brushes and advising of a works closure.18th Dec 1934Box 166 \ 1  img046
Dynamo brush chattering caused by incorrectly oriented brush springs.21th Feb 1935Box 166 \ 1  img047
Request to order six standard 20/25 dynamo brushes of grade EG3 from Messrs. Morganite.25th Feb 1935Box 166 \ 1  img048
Blueprints and testing samples for 40/50 HP and Bentley dynamo and commutator brushes.7th Mar 1935Box 166 \ 1  img049
Requesting the modification of two 40/50 dynamo brush holders to test larger brushes on the Spectre dynamo.12th Mar 1935Box 166 \ 1  img050
Order request for six Morganite Dynamo Brushes from the Morganite Crucible Co.12th Mar 1935Box 166 \ 1  img051
Requesting the testing of sample Carbon Brushes from Le Carbone Ltd.29th Mar 1935Box 166 \ 1  img052
Standardisation of parts for Morganite Ego brushes on the dynamo.22th Feb 1935Box 166 \ 1  img053
Statement on the nil cost for extra jigs and tools to bring the 'F' series chassis into production.12th Mar 1935Box 166 \ 1  img054
Standardisation of Morganite Ego brushes on the dynamo.22th Mar 1935Box 166 \ 1  img055
Standardization of parts document detailing the cost of extra jigs and tools for production on the U2 series chassis.28th Mar 1935Box 166 \ 1  img056
Private memo discussing an increase in dynamo troubles on the 3.5-litre Bentley, due to carbon deposits from the brush gear.19th Aug 1935Box 166 \ 1  img057
Letter from Le Carbone Ltd. regarding the supply of trial brushes for lighting set dynamos.5th Sep 1935Box 166 \ 1  img058
Letter from Synthetic Carbon & Engineering Co. Ltd. regarding trial brushes and enclosing previous correspondence.17th Sep 1935Box 166 \ 1  img059
Advertisement for 'SYN' Carbon Brushes, listing their applications and the manufacturer's contact details.17th Sep 1935Box 166 \ 1  img060
Data sheet for 'SYN' carbon brush grades and their applications, from the Synthetic Carbon & Engineering Company, Ltd.17th Sep 1935Box 166 \ 1  img061
Advertisement for 'Syn' brush holders and carbon brushes from the Synthetic Carbon & Engineering Company, Ltd.17th Sep 1935Box 166 \ 1  img062
Advertisement for 'SYN' brand copper contact parts from the Synthetic Carbon & Engineering Company, Ltd.24th Jun 1935Box 166 \ 1  img063
Delivery note from Synthetic Carbon & Engineering Co. for various carbon brushes.24th Jun 1935Box 166 \ 1  img064
Letter commenting on trials of carbon brushes for small car generators and recommending further tests with new grades.7th Jun 1935Box 166 \ 1  img065
Letter from Synthetic Carbon & Engineering Company Ltd. concerning brush holder samples, specifications, and pricing.7th Jun 1935Box 166 \ 1  img066
Letter from Synthetic Carbon & Engineering Company regarding the performance, materials, and pricing of carbon brushes and seals.18th May 1938Box 166 \ 1  img067
Issues with the unsatisfactory assembly of dynamo brush springs causing commutator sparking.6th Nov 1935Box 166 \ 1  img068
Technical memorandum discussing the re-design of dynamo brush gear to address issues with brush sparking.20th Nov 1935Box 166 \ 1  img069
List of recommendations for improving dynamo armatures and brush holders, referencing a design by the Morganite Co.20th Nov 1935Box 166 \ 1  img070
Requesting the overhaul of a dynamo in preparation for a 10,000 miles brush test.21th Dec 1935Box 166 \ 1  img071
Proposed new design for the Phantom III Dynamo brush holder, detailing changes and required parts.19th Feb 1936Box 166 \ 1  img072
Continued list of parts for a Brush Holder, including a spring washer and lock nut.19th Feb 1936Box 166 \ 1  img073
Letter from Le Carbone Ltd. regarding trial brushes for lighting set dynamos and providing technical data.29th Apr 1936Box 166 \ 1  img074
Request for stronger springs to be made and fitted to an experimental brush-holder.16th May 1936Box 166 \ 1  img075
Request to manufacture four experimental brush-holder springs from two different wire gauges.11th Jun 1936Box 166 \ 1  img076
The completion of a dynamo brush endurance test and preparations for the next one.18th Jun 1936Box 166 \ 1  img077
Requesting the manufacture of stronger springs for experimental brushholders.18th Jun 1936Box 166 \ 1  img078
Summary of examination and tests for a new brushholder design.9th Jul 1936Box 166 \ 1  img079
List of technical observations regarding a pressure arm and brush assembly.5th Aug 1936Box 166 \ 1  img080


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