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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Differences between Lucas and Watford drawings for a 40/50HP Chassis Magneto.8th Oct 1925Box 40 \ 2  Scan058
Comparison of a Lucas magneto against a standard Watford magneto for an EAC, noting dimensional differences.12th Oct 1925Box 40 \ 2  Scan059
Communication regarding modifications to Lucas Magnetos for EAC, specifically a new thread on the driving spindle.19th Oct 1925Box 40 \ 2  Scan060
Expected despatch of Lucas Magnetos for EAC.30th Nov 1925Box 40 \ 2  Scan061
Letter from Joseph Lucas Limited regarding alterations to magnetos for quieter running.23th Dec 1925Box 40 \ 2  Scan062
Magnetos from Lucas and Simms for the new Phantom chassis.5th Jan 1926Box 40 \ 2  Scan063
The performance and suitability of Lucas and Simms magnetos, including proposed modifications.5th Jan 1926Box 40 \ 2  Scan064
Preliminary report on a visit to the Lucas factory regarding the manufacture and production of magnetos.14th Dec 1925Box 40 \ 2  Scan065
Component specifications and test instructions for an experimental magneto.29th Jun 1920Box 40 \ 2  Scan066
Form recording the design and performance details of a magneto.17th Dec 1925Box 40 \ 2  Scan067
Specifications for primary point gap, contact breaker timing, and automatic advance characteristics.17th Dec 1925Box 40 \ 2  Scan068
Test report detailing results from endurance, short circuit, and open circuit tests.17th Dec 1925Box 40 \ 2  Scan069
Test results for a primary circuit, including ampere-speed curves and sparking characteristics.17th Dec 1925Box 40 \ 2  Scan070
Test results for secondary milliamps, primary point gap, and contact breaker timing.17th Dec 1925Box 40 \ 2  Scan071
Remarks regarding the silence of operation, noting noisy bearings.11th Jan 1926Box 40 \ 2  Scan072
Bench testing of a Lucas magneto and a forthcoming modified version.11th Jan 1926Box 40 \ 2  Scan073
Letter postponing a visit from Dr. Turner of Joseph Lucas Ltd regarding magnetos for E.A.C.20th Jan 1926Box 40 \ 2  Scan074
Letter from Joseph Lucas Ltd. proposing an appointment to test a new magneto for quiet running on a chassis.19th Jan 1926Box 40 \ 2  Scan075
Confirming receipt of a Lucas magneto and reminding of an upcoming meeting with Dr. Turner.28th Jan 1926Box 40 \ 2  Scan076
Table of lowest speeds in RPM for various magnetos for regular firing on 5.5 mm gaps in air.29th Jan 1926Box 40 \ 2  Scan077
The return of two Lucas magnetos and proposed alterations for future supplied machines.29th Jan 1926Box 40 \ 2  Scan078
Electrical experimental record sheet for a Lucas type EBA6 Magneto No 156.29th Jan 1926Box 40 \ 2  Scan079
Graph of the O.C. Volts and S.C. Ampere-Speed characteristics for the primary winding of Lucas EBA6 and Simms SR6L type magnetos.8th Jan 1926Box 40 \ 2  Scan080
Stamped cover page from the Print Room in Derby.27th Jan 1926Box 40 \ 2  Scan081
Test report for a Lucas Magneto Type EBA6 No. 155.1st Feb 1926Box 40 \ 2  Scan082
Correspondence with supplier J. Lucas Ltd. concerning alterations to magnetos.5th Feb 1926Box 40 \ 2  Scan083
Customer's conditional order pending experiments with a Lucas Magneto.11th Feb 1926Box 40 \ 2  Scan084
The testing status and progress of the Lucas Magneto.2nd Feb 1926Box 40 \ 2  Scan085
Requesting a Lucas magneto for experimentation, highlighting its advantage of requiring less force to operate.15th Feb 1926Box 40 \ 2  Scan086
Correspondence with Joseph Lucas Ltd. regarding the progress and delivery schedule for two sample magnetos.17th Mar 1926Box 40 \ 2  Scan087
The receipt of a Lucas magneto for bench tests.27th Mar 1926Box 40 \ 2  Scan088
Graph of Open Circuit Volt-Speed and Short Circuit Ampere-Speed curves for the primary winding of a Lucas ER6 Magneto No. 50.1st Apr 1936Box 40 \ 2  Scan089
Specification sheet comparing distributor dimensions with suggested dimensions for the Lucas Magneto Type ER6 No. 50.1st Apr 1936Box 40 \ 2  Scan090
Specification table for the Lucas Magneto Type ERS No. 50, comparing distributor dimensions.21th Apr 1926Box 40 \ 2  Scan091
Confirming receipt of an advice note from Joseph Lucas Ltd. about the dispatch of an ER.6 magneto.21th Apr 1926Box 40 \ 2  Scan092
List of queries raised by Mr. North regarding the Lucas ER.6 Magneto.29th Mar 1926Box 40 \ 2  Scan093
Form recording the design and performance details of a Lucas ER6 magneto on test.29th Mar 1926Box 40 \ 2  Scan094
Specification sheet for ignition timing, primary point gap, and advance characteristics.29th Mar 1926Box 40 \ 2  Scan095
Test results for endurance, short circuit, and open circuit conditions, including a volt-speed curve.29th Mar 1926Box 40 \ 2  Scan096
On leaky gap performance, detailing engine speeds for different ignition timing settings.29th Mar 1926Box 40 \ 2  Scan097
Test data sheet detailing a closed-circuit primary ampere-speed curve, speed range, and sparking characteristics.29th Mar 1926Box 40 \ 2  Scan098
Test report detailing secondary milliamps, primary point gap, and contact breaker timing results.29th Mar 1926Box 40 \ 2  Scan099
Remarks on the operational silence of a specially made quiet magneto.12th Apr 1926Box 40 \ 2  Scan100
Letter from Joseph Lucas Ltd. regarding the specifications and performance of a new type of magneto.12th Apr 1926Box 40 \ 2  Scan101
Letter from Joseph Lucas Ltd. concerning sending a machine for performance checks.12th Apr 1926Box 40 \ 2  Scan102
Test results for a Magneto type E.R.6, showing utility values in Micromhos with various cams.12th Apr 1926Box 40 \ 2  Scan103
Table of data showing minimum sparking speeds for magnetos at various timing positions and cam angles.12th Apr 1926Box 40 \ 2  Scan104
Specification sheet for minimum sparking speeds and leading distributor dimensions.24th Apr 1926Box 40 \ 2  Scan105
Form recording the design and performance details of a magneto on test.24th Apr 1926Box 40 \ 2  Scan106
Engine ignition timing specifications for point gap, contact breaker timing, and automatic advance characteristics.24th Apr 1926Box 40 \ 2  Scan107
Test report page detailing the results of various electrical circuit tests.24th Apr 1926Box 40 \ 2  Scan108
Test results page detailing sparking characteristics, speed range, and other performance data.24th Apr 1926Box 40 \ 2  Scan109
Test report detailing secondary milliamps, primary point gap, and contact breaker timing measurements.24th Apr 1926Box 40 \ 2  Scan110
The quiet operation of a magneto and the tangential force required to move a cam cover.4th May 1926Box 40 \ 2  Scan111
Comparison of Lucas and Watford magnetos for the Phantom model, advising against the cheaper option to protect the company's reputation.4th May 1926Box 40 \ 2  Scan112
Comparing the Lucas magneto with the standard Watford magneto, proposing tests on the newer Lucas ER6 model.7th Jun 1926Box 40 \ 2  Scan113
Analysis of issues with the standard Watford magneto and a list of proposed improvements for the Lucas magneto.4th Jun 1926Box 40 \ 2  Scan114
Advantages of a new magneto design and proposals for testing on an experimental chassis.4th Jun 1926Box 40 \ 2  Scan115
Comparative testing of the Lucas magneto against the standard Watford magneto for potential standardization.7th Jun 1926Box 40 \ 2  Scan116
Report page discussing a guarantee of reliability from the Lucas Co. for a magneto and a recent visit by Mr. North.8th Jun 1926Box 40 \ 2  Scan117
Comparing Lucas and Watford magnetos regarding production methods, cost, design, and brand reputation.8th Jun 1926Box 40 \ 2  Scan118
Magneto reliability, comparing Watford and Lucas products and the potential impact on brand reputation.8th Jun 1926Box 40 \ 2  Scan119
Letter from a director at Peto & Radford giving initial impressions on a newly fitted Lucas magneto.5th Jul 1926Box 40 \ 2  Scan120
Form recording the design and performance details of a Lucas ER6 magneto under test.10th Aug 1926Box 40 \ 2  Scan121
Specifications for primary point gap and contact breaker timing.10th Aug 1926Box 40 \ 2  Scan122
Test report page detailing endurance, circuit tests, and an open circuit primary volt-speed curve.10th Aug 1926Box 40 \ 2  Scan123
Test results for a closed circuit primary ampere-speed curve and sparking characteristics.10th Aug 1926Box 40 \ 2  Scan124
Test results for secondary milliamps, primary point gap, and contact breaker timing.10th Aug 1926Box 40 \ 2  Scan125
Remarks on the silence of operation and a tangential force measurement.10th Aug 1926Box 40 \ 2  Scan126
Request to install a Lucas ER6 magneto on chassis 8-EX and return the existing Watford magneto.19th Aug 1926Box 40 \ 2  Scan127
6000-mile performance report on Chassis 12-EX, focusing on the magneto, battery ignition, and ignition governor.19th Aug 1926Box 40 \ 2  Scan128
Extract from a letter from Peto & Radford regarding a special dynamo and the performance of a Lucas magneto.23th Aug 1926Box 40 \ 2  Scan129
Chassis 12-EX, EAC.8 after a 9,000-mile test, focusing on the magneto and battery ignition systems.23th Aug 1926Box 40 \ 2  Scan130
Test results for two Lucas ER6 magnetos, numbers 53 and 54b, for fitting to an experimental chassis.8th Sep 1926Box 40 \ 2  Scan131
Forgotten Lucas magneto for chassis No. 12-EX.24th Sep 1926Box 40 \ 2  Scan132
The return of a Lucas magneto for chassis 12-EX.27th Sep 1926Box 40 \ 2  Scan133
Examination report on a faulty Lucas ER6 magneto from a 12EX model.5th Oct 1926Box 40 \ 2  Scan134
Instructions sheet with handwritten notes on a suspected magneto failure due to contact breaker points.5th Oct 1926Box 40 \ 2  Scan135
Extract from a letter from Peto & Radford regarding the performance of a Lucas magneto.5th Oct 1926Box 40 \ 2  Scan136
Internal memorandum discussing the performance and testing of Lucas type ERS magnetos.5th Oct 1926Box 40 \ 2  Scan137
Covering letter for reports on a 10,000-mile magneto test and its return to Messrs. Lucas for examination.5th Oct 1926Box 40 \ 2  Scan138
Examination report on a faulty Lucas ERS Magneto No. 51.5th Oct 1926Box 40 \ 2  Scan139
Extract of a communication to Peto & Radford regarding the testing and standardisation of a Lucas magnetow.7th Oct 1926Box 40 \ 2  Scan140
Report on the Lucas Magneto to be passed to Messrs. Lucas.12th Oct 1926Box 40 \ 2  Scan141
Investigation into the burning of distributors on Lucas magnetos following complaints and laboratory tests.26th Sep 1926Box 40 \ 2  Scan142
Continued report on distributor misfiring issues, suggesting better curing and increased carbon brush pressure as a remedy.11th Oct 1926Box 40 \ 2  Scan143
Form recording the design and performance details of a magneto on test.11th Oct 1926Box 40 \ 2  Scan144
Specifications for contact breaker timing and automatic advance characteristics.11th Oct 1926Box 40 \ 2  Scan145
Test report detailing results of endurance, short circuit, and open circuit tests, including a volt-speed curve.11th Oct 1926Box 40 \ 2  Scan146
Test results for a closed circuit primary ampere-speed curve and sparking characteristics.11th Oct 1926Box 40 \ 2  Scan147
Test results for contact breaker timing, primary point gap, and secondary milliamps.11th Oct 1926Box 40 \ 2  Scan148
Remarks on the silence of operation of a magneto and a measurement of tangential force.20th Oct 1926Box 40 \ 2  Scan149
With observations and suggestions for improving Lucas magnetos.20th Oct 1926Box 40 \ 2  Scan150
Cover letter sending a previously omitted copy of an assistant's report on the Lucas magneto.20th Oct 1926Box 40 \ 2  Scan151
Potential adoption of a Lucas magneto for the Phantom chassis.25th Dec 1928Box 40 \ 2  Scan152
Comparison of relative distributor dimensions for the Lucas Magneto Type ERS.28th Oct 1926Box 40 \ 2  Scan153
Table of distributor dimensions, relative pitches, and actual measurements for a Lucas ER6 Magneto No. 54b.28th Oct 1926Box 40 \ 2  Scan154
Arguing for continued experimental work on the Lucas Type ER6 Magneto based on its promising technical characteristics compared to the Watford magneto.29th Oct 1926Box 40 \ 2  Scan155
Suggestion to consider the Lucas magneto as a second option, noting their two-year guarantee.1st Nov 1926Box 40 \ 2  Scan156
Relative merits of Lucas, Watford, and Bosch magnetos for various engine models.1st Nov 1926Box 40 \ 2  Scan157


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