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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Proposal to use T.C.C. ignition condensers as a replacement, with a request for rigorous testing.2nd Jan 1936Box 165 \ 5  img150
Letter from Wego Condenser Co. Ltd. announcing their approved status on the Air Ministry List.18th May 1936Box 165 \ 5  img151
Data sheet for New Small Wego British Aroclor Condensers, Type A.I. Continuous Rated.19th May 1946Box 165 \ 5  img152
Cover page for a brochure on Wego British Aroclor Condensers.19th May 1946Box 165 \ 5  img153
Front cover of a WEGO capacitor product catalog or brochure.19th May 1946Box 165 \ 5  img154
Promotional leaflet for a condenser manufacturer detailing factory expansion and listing international agents.19th May 1946Box 165 \ 5  img155
Price list and specification sheet for Type T.W. and Type T.L. tubular condensers.19th May 1946Box 165 \ 5  img156
Specification and price list for Wego British Type BT (Bakelite) and Type ALU capacitors.19th May 1946Box 165 \ 5  img157
Specification sheet for WEGO British condensers, detailing types, dimensions, and prices.19th May 1946Box 165 \ 5  img158
Product specification sheet for WEGO British capacitors of types HS, HR, and HP.19th May 1946Box 165 \ 5  img159
Product specification and price list for Wego British transmitting condensers.19th May 1946Box 165 \ 5  img160
Product data sheet for interference eliminators and compensators for various electrical motors and apparatus.22th May 1936Box 165 \ 5  img161
Letter to Wego Condenser Co. Ltd. requesting a sample of a material known as Aroclor for inspection and testing.22th May 1936Box 165 \ 5  img162
Letter from Wego Condenser Co. Ltd. responding to a request for a sample of Aroclor, which they are unable to supply.25th May 1936Box 165 \ 5  img163
Letter to Wego Condenser Co. Ltd. requesting the source of supply for an Aroclor sample needed for an ignition coil experiment.27th May 1936Box 165 \ 5  img164
Letter from Delco-Remy & Hyatt Ltd. regarding the supply of British-made condensers and ignition components for testing.18th Sep 1936Box 165 \ 5  img165
Invoice from Delco-Remy & Hyatt Ltd. for condensers and contact point sets supplied for test purposes.18th Sep 1936Box 165 \ 5  img166
Invoice from Delco-Remy & Hyatt Ltd. for condensers and contact point sets supplied for test purposes.18th Sep 1936Box 165 \ 5  img167
Internal requisition to order an ignition testing condenser.25th Feb 1937Box 165 \ 5  img168
The accessibility of the Phantom III condenser and a suggestion for improvement.28th May 1937Box 165 \ 5  img169
Proposal to improve the accessibility of the Phantom III condenser for easier replacement by slotting the contact strip hole.28th May 1937Box 165 \ 5  img170
Requesting endurance tests to be carried out on at least half a dozen Lucas condensers for a new distributor.17th Feb 1939Box 165 \ 5  img171
Request for the capacity values, in microfarads, of condensers for various Bentley and Rolls-Royce chassis.15th May 1939Box 165 \ 5  img172
Specifications and usage of various condensers on different car models.25th May 1939Box 165 \ 5  img173
Cover note regarding the brush and commutator system for 20/25 dynamos.29th Sep 1924Box 165 \ 6  img001
Note providing cross-references for previous correspondence about a 20 HP dynamo.29th Sep 1924Box 165 \ 6  img002
Representative performance figures and routine procedure for the New Standard 20 HP Dynamo.29th Sep 1924Box 165 \ 6  img003
Blueprint graph of representative dynamo output curves against R.P.M. and chassis M.P.H.27th May 1925Box 165 \ 6  img004
Chart of dynamo output at different speeds under various electrical loads.30th Aug 1925Box 165 \ 6  img005
Requesting a failed dynamo be returned to the Experimental Department in Derby rather than being repaired in Paris.10th Sep 1925Box 165 \ 6  img006
Dynamo failure on 9-G-111 due to a suspected sticking control brush.14th Sep 1925Box 165 \ 6  img007
Electrical equipment failures during a 10,000-mile test of a 20 HP vehicle.22th Sep 1925Box 165 \ 6  img008
Feature for accessing the dynamo on the 20 HP model and adding a note to the instruction book.28th Sep 1925Box 165 \ 6  img009
The required dynamo brush clearances for 40/50 HP and 20 HP models.3rd Nov 1925Box 165 \ 6  img010
Clarifying the minimum dynamo brush clearances for 20 HP models.10th Nov 1925Box 165 \ 6  img011
Correct dynamo brush clearances for the 20 HP model.16th Nov 1925Box 165 \ 6  img012
Improvements to the dynamo and ignition platinum points.20th Nov 1925Box 165 \ 6  img013
Performance graph comparing the specified and actual output of a 20 HP dynamo.1st Feb 1926Box 165 \ 6  img014
Chassis 10-GIII after 7526 miles, detailing the condition of the Magneto and Dynamo.23th Apr 1926Box 165 \ 6  img015
Test results for a fixed conductance dynamo on a 20 HP model.7th Apr 1925Box 165 \ 6  img016
The condition of the magneto, drive, and dynamo of chassis 10-GIII after a 10,027-mile test.4th May 1926Box 165 \ 6  img017
The findings from an inspection of production dynamo No. 1801.30th Jun 1926Box 165 \ 6  img018
Procedure for dynamo tests.12th Jan 1926Box 165 \ 6  img019
Instructions for an experimental 20 HP chassis dynamo to reduce noise.7th Jun 1926Box 165 \ 6  img020
Test results for a fixed conductance dynamo on a 20 HP car.28th Jun 1926Box 165 \ 6  img021
Graph showing the ampere output of a 20 HP dynamo at various RPMs and resistances.26th May 1926Box 165 \ 6  img022
EFC to RHC regarding the stripping and re-winding of two 20 HP dynamo armatures.11th Aug 1926Box 165 \ 6  img023
Requesting modifications to a 20 HP dynamo to reduce noise.21th Aug 1926Box 165 \ 6  img024
Observations on the operation of 20 HP and 40/50 HP standard dynamos without a battery connected.28th Jun 1926Box 165 \ 6  img025
Test results concerning the voltage and amperage of the dynamo and distribution box for 20 HP and 40/50 HP models under various conditions.28th Jun 1926Box 165 \ 6  img026
Page discussing operational risks and the reduction of voltage/ampere output at high speeds.28th Jun 1926Box 165 \ 6  img028
Inspection and test report for a 20 HP Production Dynamo No. 1863, detailing minor electrical and constructional faults.1st Sep 1926Box 165 \ 6  img029
Cover note for a report on temperature observations of dynamos during chassis dynamometer tests.5th Oct 1926Box 165 \ 6  img030
Temperatures reached by dynamos during dynamometer testing on various chassis.2nd Oct 1926Box 165 \ 6  img031
Testing and potential standardization of a 20 HP dynamo with solid pole pieces.13th Oct 1926Box 165 \ 6  img032
Performance graph of a dynamo for the 20 HP model, showing output against RPM at various temperatures.28th Apr 1937Box 165 \ 6  img033
The negative effects of a 20 HP dynamo modification intended for silencing.13th Oct 1926Box 165 \ 6  img034
Performance graph of the N.C.288 Dynamo for the 20 HP model, showing ampere output and voltage against RPM and chassis speed.18th Oct 1926Box 165 \ 6  img035
Specification for the production inspection and testing of a 20 HP Dynamo with a 57 coil armature.18th Oct 1926Box 165 \ 6  img036
Procedure for the bedding and testing of dynamo brushes.18th Oct 1926Box 165 \ 6  img037
Continued list of test procedures for a dynamo, including checks for voltage, noise, sparking, and insulation.28th Oct 1926Box 165 \ 6  img038
Test report for a 20 HP Production Dynamo No. 84H, detailing minor faults found during inspection.28th Oct 1926Box 165 \ 6  img039
Querying the production advantages of using solid pole pieces over laminated ones for a 20 HP dynamo.23th Nov 1926Box 165 \ 6  img040
Potentially noisy 20 HP monthly production dynamo, model no. P.9.K.2nd Dec 1926Box 165 \ 6  img041
Temperature observations relating to the melting points of commutator solder and sentinels on 40/50 HP and 20 HP machines.2nd Dec 1926Box 165 \ 6  img042
Standardization of dynamo and motor poles, considering a switch from laminated to solid poles for cost savings.8th Dec 1926Box 165 \ 6  img043
Comparison table of features for various horsepower dynamos and motors.16th Dec 1926Box 165 \ 6  img044
Alterations to the 20 HP dynamo specification.15th Dec 1926Box 165 \ 6  img045
Noise from a Dynamo S.5.H. machine and suggesting alterations and tests to reduce it.16th Dec 1926Box 165 \ 6  img046
Test results on 20 HP dynamos with varying eccentricities and their effect on quietness.17th Dec 1926Box 165 \ 6  img047
Table of dimensions for main and control dynamo brushes for various HP models.24th Dec 1926Box 165 \ 6  img048
Practically noiseless 28-slot armature for a 20 HP dynamo and requesting further production for testing.31th Dec 1926Box 165 \ 6  img049
Testing of Dynamo No. 161 with an experimental armature on a 20-HP chassis.29th Dec 1926Box 165 \ 6  img050
Instruction to experimentally build a 28 slot, 56 commutator segment straight slot armature for a 20 HP Dynamo.4th Jan 1927Box 165 \ 6  img051
Modifications for noisy 20 HP chassis dynamos.7th Jan 1927Box 165 \ 6  img052
Graph showing dynamo output curves for a 20 HP engine under different operating conditions.10th Jan 1927Box 165 \ 6  img053
The urgent provision of a quieter 20 HP, 28-slot dynamo armature due to issues with silence on the chassis.10th Jan 1927Box 165 \ 6  img054
Request to put in hand one custom armature for a 20 HP chassis dynamo.14th Jan 1927Box 165 \ 6  img055
Statement regarding the adoption of a new armature design with 28 slots and 56 coils to make the dynamo quieter.18th Jan 1927Box 165 \ 6  img056
Continuation page detailing calculations for coil pitch and commutator connections.31th Jan 1927Box 165 \ 6  img057
Experiment with a 20 HP dynamo, No. 625, involving solid poles and a 28 slot armature to reduce noise.31th Jan 1927Box 165 \ 6  img058
Extract discussing the supply and wear patterns of 20 HP dynamo brushes.14th Feb 1927Box 165 \ 6  img059
Confirming a 20 HP, 28 slot armature with solid poles is ready for chassis 10-GIII.16th Feb 1927Box 165 \ 6  img060
Exclusion of dynamo brushes and other parts from the spares kit.2nd Feb 1927Box 165 \ 6  img061
Page 2 of a revised letter from Le Carbone, detailing sample dynamo brushes for 20 HP and 40/50 HP lighting sets.3rd Mar 1927Box 165 \ 6  img062
Bench-test report for E.G.A. Le Carbone Brushes.3rd Mar 1927Box 165 \ 6  img063
The wear rates of different brush types, comparing a new type to the standard and noting an ongoing test.29th Jun 1920Box 165 \ 6  img064
Bench test report for EG347 LeCarbone 20lb Dynamo Brushes.1st Apr 1927Box 165 \ 6  img065
Instructions regarding the testing and comparison of different brushes to solve a chattering issue.29th Jun 1929Box 165 \ 6  img066
Bench test report on the performance of LFC3DBS Le Carbone 20/25 dynamo brushes.4th Apr 1927Box 165 \ 6  img067
Test report on the wear of different brushes and their effect on a commutator.20th Jun 1920Box 165 \ 6  img068
Agreement form discussing an addition to an instruction sheet regarding machine rectification for faulty output and commutation.14th Mar 1927Box 165 \ 6  img069
On the testing and potential production of modified 20 HP dynamos for improved silence in Phantom vehicles.31th Mar 1927Box 165 \ 6  img070
Trialling a 20 HP dynamo with a new 28-slot armature to fix a noise issue.4th Apr 1927Box 165 \ 6  img071
Confirming the production of 25 experimental 20 HP dynamo armatures after satisfactory silence testing.6th Apr 1927Box 165 \ 6  img072
Requesting a written report on the success of a 28-slot armature in improving the silence of a 20 HP Dynamo.23th Apr 1927Box 165 \ 6  img073
The testing of three different 20-HP dynamos with 28 slot armatures.25th Apr 1927Box 165 \ 6  img074
Experimental 20 HP Dynamo armature with 28 slots for noise reduction.26th Apr 1927Box 165 \ 6  img075
The temperature of a chassis dynamo following a 10,000 mile test.26th May 1927Box 165 \ 6  img076
Design specifications for a car dynamo, focusing on coil and slot configurations.29th Apr 1927Box 165 \ 6  img077


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