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 and issues of various battery ignition systems, specifically Delco, in comparison to magnetos.16th May 1921Box 37 \ 1  scan 112
The utility test of a slate slab used to simulate leakage on magneto and battery ignition systems.2nd Jun 1922Box 37 \ 1  scan 113
Extract from a report on ignition system leakage and spark gap performance.14th Nov 1921Box 37 \ 1  scan 114
Test report on slate resistance and its effect on ignition spark gaps for a utility test.14th Nov 1921Box 37 \ 1  scan 115
Continued page on comparative utility tests for battery and magneto ignition systems, and the difficulty of measuring resistance.1st Aug 1921Box 37 \ 1  scan 116
Inquiry about the performance and market resistance of cars fitted with only battery ignition in India.1st Aug 1921Box 37 \ 1  scan 117
Letter to Mr. Peat in Australia requesting feedback on cars fitted with battery-only ignition.1st Aug 1921Box 37 \ 1  scan 118
Letter discussing magneto ignition issues, spark plug oxidisation, and a proposed solution using a Delco switch.4th Aug 1921Box 37 \ 1  scan 119
Letter discussing the benefits of the Benjamin Klaxon switch over the existing starter button.18th Aug 1921Box 37 \ 1  scan 120
Fire risk and usability of the ignition switch position on the steering column.10th Oct 1921Box 37 \ 1  scan 121
Forwarding a letter from the representative in India regarding cars fitted only with battery ignition.10th Oct 1921Box 37 \ 1  scan 122
Report from the Delhi service depot on the market preference for magneto ignition over battery ignition in India.15th Sep 1921Box 37 \ 1  scan 123
Arguing against battery-only ignition systems, citing the lack of charging facilities and frequent battery failures.15th Sep 1921Box 37 \ 1  scan 124
Letter advising against battery ignition for cars in Australia, contrasting the conditions with America.9th Sep 1921Box 37 \ 1  scan 125
Technical report discussing the advantages and disadvantages of magneto versus battery ignition systems.9th Sep 1921Box 37 \ 1  scan 126
Letter discussing reasons for battery failure and proposing alternative starting mechanisms for vehicles.19th Sep 1921Box 37 \ 1  scan 127
Invitation from Automotive Products Company to visit their stand at the Motor Exhibition.2nd Nov 1921Box 37 \ 1  scan 128
Investigation into engine starting difficulties in cold weather and a request for a new battery.15th Nov 1921Box 37 \ 1  scan 129
Continued report on the ignition efficiency of a small pump engine, comparing magneto and battery systems.15th Nov 1921Box 37 \ 1  scan 130
List of effects to be considered for battery ignition systems.17th Jan 1922Box 37 \ 1  scan 131
Technical description and performance analysis of an annular spark gap.26th Jan 1922Box 37 \ 1  scan 132
Report page detailing issues with obtaining regular sparking and the unsuitability of a specific spark gap for general use.23th Nov 1921Box 37 \ 1  scan 133
Outlining the requirements for a battery ignition system on the Goshawk engine.14th Feb 1922Box 37 \ 1  scan 134
Analysis of the Delage car's ignition system, comparing magneto and battery ignition options.26th Jun 1922Box 37 \ 1  scan 135
Philbrin battery ignition system and an attached pamphlet.8th Nov 1922Box 37 \ 1  scan 136
Brochure for Philbrin coil ignition systems detailing available types, prices, and the sole concessionnaires.8th Nov 1922Box 37 \ 1  scan 137
Technical overview of the Philbrin Coil Ignition system, detailing its components, features, and operation.8th Nov 1922Box 37 \ 1  scan 138
Family tree diagram of battery ignition and coil part numbers.13th Nov 1922Box 37 \ 1  scan 139
Series of design suggestions for the Goshawk and other battery ignition systems to mitigate H.T. losses.13th Nov 1922Box 37 \ 1  scan 140
Letter discussing testing condenser materials, coil construction modifications, and issues with ignition at slow speeds.13th Nov 1922Box 37 \ 1  scan 141
Coil performance, testing methods, and standardisation for the Goshawk engine.3rd Nov 1922Box 37 \ 1  scan 142
Trial report on a standard test gap for magnetos and coil ignition systems.8th Feb 1923Box 37 \ 1  scan 143
Experimental work testing the effect of an external gap on magneto and coil sparking performance.8th Mar 1923Box 37 \ 1  scan 144
Tests on a chemical leak for a standard gap, analyzing the variation of its conductance with temperature.8th Mar 1923Box 37 \ 1  scan 145
The conductance of a chemical leak, detailing measurements at various temperatures.14th Mar 1923Box 37 \ 1  scan 146
American battery ignition systems, discussing power consumption, components, materials, and comparison to magnetos.4th Mar 1924Box 37 \ 1  scan 147
Short lifespan of platinum points in the electrical system and suggesting design improvements.11th May 1925Box 37 \ 1  scan 148
Mr. Royce's remarks on corrosion and H.T. tracking issues in EAC battery ignition distributor mouldings.1st Aug 1925Box 37 \ 1  scan 149
Electrical troubles regarding magneto platinum points and battery ignition points.14th Feb 1927Box 37 \ 1  scan 150
Report concerning the usage of high tension distributor points and dynamo brushes for the 20 HP model.28th Jun 1927Box 37 \ 1  scan 151
Responding to a query on the electrical system's capacity and dynamo output for a 20 HP car, GLK-46.28th Jun 1927Box 37 \ 1  scan 152
Letter to The Lucas Electrical Co. discussing the reasons for the continued manufacture of battery ignition systems.26th Jun 1927Box 37 \ 1  scan 153
Page 2 of a letter discussing experiments and issues with battery ignition systems and dynamo armatures.1st Jul 1927Box 37 \ 1  scan 154
Letter from Joseph Lucas Research Laboratories discussing investigations into battery and coil ignition systems.1st Jul 1927Box 37 \ 1  scan 155
Letter from Joseph Lucas Ltd. discussing developments in battery ignition systems and quiet running dynamos.1st Jul 1927Box 37 \ 1  scan 156
Letter to Joseph Lucas Ltd. concerning battery ignition system contact points and the 'make' vs 'break' period.6th Jul 1927Box 37 \ 1  scan 157
Article on recent developments and requirements for aircraft ignition-systems.1st Jul 1927Box 37 \ 1  scan 158
Page discussing headlighting performance on wet roads and the development of transcontinental highways.1st Jul 1927Box 37 \ 1  scan 159
Paper on recent aircraft-ignition developments, discussing design and electrical requirements.1st Jul 1927Box 37 \ 1  scan 160
Journal page discussing ignition systems, insulation for supercharged engines, and radio shielding.1st Jul 1927Box 37 \ 1  scan 161
Recent developments in aircraft ignition systems and radio-shielding principles.1st Jul 1927Box 37 \ 1  scan 162
Investigation into fire hazards from airplane ignition systems and the development of fire-proofing methods for magnetos.1st Jul 1927Box 37 \ 1  scan 163
Page from a publication discussing recent developments in aircraft engine ignition systems, including double magnetos and spark plug terminals.1st Jul 1927Box 37 \ 1  scan 164
Page from a journal detailing Splitdorf and Scintilla double magnetos for aircraft engines.1st Jul 1927Box 37 \ 1  scan 165
Recent developments in aircraft ignition systems and high-speed breaker mechanisms.1st Jul 1927Box 37 \ 1  scan 166
Page from an engineering journal discussing the development and timing method for a pivotless breaker in high-speed engines.1st Jul 1927Box 37 \ 1  scan 167
Technical bulletin on recent aircraft ignition developments, focusing on magnetos and the Liberty-12 Delco ignition-distributor.1st Jul 1927Box 37 \ 1  scan 168
Page from an automotive engineering journal comparing battery versus magneto ignition systems, and detailing distributor designs.1st Jul 1927Box 37 \ 1  scan 169
Recent aircraft ignition developments, including weight comparisons of various systems and specifications for an ideal system.1st Jul 1927Box 37 \ 1  scan 170
Page from The Journal of the Society of Automotive Engineers discussing ignition systems and foremanship courses.1st Jul 1927Box 37 \ 1  scan 171
Quoting a letter from Mr. Olley regarding the performance of ignition coils, with and without ballast resistance.9th Nov 1927Box 37 \ 1  scan 172
Improvements to a battery ignition system, including contacts, distributor, and coil construction.12th Dec 1927Box 37 \ 1  scan 173
Current experiments on ignition system components including ballast resistance, coils, condensers, contact breakers, distributors, and magnetos.6th Mar 1928Box 37 \ 1  scan 174
Continued document outlining comparative tests on High Tension (H.T.) wiring for chassis and aero applications.21th Oct 1929Box 37 \ 1  scan 175
Extract from H.E. West's report on the 1929 Motor Show at Olympia, detailing a dual ignition device from S.E.V. Co.21th Oct 1929Box 37 \ 1  scan 176
Family tree diagram of battery ignition and coil part numbers.17th Feb 1930Box 37 \ 1  scan 177
Letter from W. D. Foster & Co. regarding a new ALCO Combined Magneto and Battery Ignition Unit.17th Feb 1930Box 37 \ 1  scan 178
Business letter from W. D. Foster & Co. discussing aeroplane magneto failures and proposing a new instrument.17th Feb 1930Box 37 \ 1  scan 179
Product specification sheet for the S.E.V. 'ALCO' ignition apparatus.17th Feb 1930Box 37 \ 1  scan 180
Dimensional drawing for an ALCO distributor for 4 and 6 cylinder engines.18th Feb 1930Box 37 \ 1  scan 181
Letter to Messrs. W.D. Foster & Co. declining interest in the ALCO Combined Magneto and Battery Ignition Unit.18th Feb 1930Box 37 \ 1  scan 182
Design and potential benefits of the 'Mallory' battery igniter.25th Jun 1930Box 37 \ 1  scan 183
Requesting a Mallory igniter for comparative laboratory testing.23th Jul 1930Box 37 \ 1  scan 184
Battery ignition sparking plug voltage tests carried out on 20/25 and 40/50 chassis.5th Dec 1930Box 37 \ 1  scan 185
Test report on sparking plug performance on experimental Phantom II and production 20/25 chassis.5th Dec 1930Box 37 \ 1  scan 186
Test results comparing plug voltage at different plug gaps and water temperatures.5th Dec 1930Box 37 \ 1  scan 187
Test results for sparking plug voltages on a 20/25 HP chassis at different plug gaps.5th Dec 1930Box 37 \ 1  scan 188
Ignition coil performance, voltage output, and spark plug gap settings for battery ignition engines.5th Dec 1930Box 37 \ 1  scan 189
Recommendation to experiment with a higher voltage ignition coil to address engine missing issues on various chassis.8th May 1931Box 37 \ 1  scan 190
Arranging for a visit to Cricklewood to improve electrical fault diagnosis procedures.8th May 1931Box 37 \ 1  scan 191
Ignition faults on customer chassis and the issue of non-faulty components being returned for repair.8th May 1931Box 37 \ 1  scan 192
Instructing repair depots on the preliminary checks to perform for ignition troubles before removing units.8th May 1931Box 37 \ 1  scan 193
New procedure for diagnosing battery ignition troubles on customer chassis, particularly for the 20/25 HP model.20th May 1931Box 37 \ 1  scan 194
Battery ignition troubles and the possibility of issuing volt meters to engineers and testers.23th May 1931Box 37 \ 1  scan 195
New suggested method for diagnosing battery ignition troubles on customer chassis.23th May 1931Box 37 \ 1  scan 196
Suggested procedure for tracing ignition troubles on a customer's chassis.23th May 1931Box 37 \ 1  scan 197
Visit to Cricklewood to resolve misunderstandings regarding the diagnosis of faulty electrical ignition components.23th May 1931Box 37 \ 1  scan 198
Continued discussion on customer complaints regarding a starter, switchbox repairs, and ignition failures.23th May 1931Box 37 \ 1  scan 199
Confirming the provision of a free set of H.T. spark gaps and an old 20 HP battery ignition distributor to a Mr. Kemp.2nd Jun 1931Box 37 \ 1  scan 200
Visit to Messrs. Lucas to discuss technical collaboration, testing facilities, and components.5th Jun 1931Box 37 \ 1  scan 201
The design and performance of horns, battery ignition, headlamps, and windscreen wipers.5th Jun 1931Box 37 \ 1  scan 202
Re-arranged proportions for a Battery Ignition H.T. Rotor Drive to facilitate production.8th Jun 1931Box 37 \ 1  scan 203
Letter to the British Thomson-Houston Co. Ltd. regarding the ignition system of a Daimler double six.18th Aug 1931Box 37 \ 1  scan 204
Design modification for the Peregrine engine's battery ignition system.12th Jan 1932Box 37 \ 1  scan 205
Causes and potential remedies for ignition missing fire at slow speed.16th Apr 1932Box 37 \ 1  scan 206
Potential advantages of a suction-operated ignition control switch for cars and aircraft.20th Sep 1932Box 37 \ 1  scan 207
Advertising leaflet for the UTEX Ignition Switch, a safety device for vehicles.20th Sep 1932Box 37 \ 1  scan 208
Advertisement leaflet for a UTEX suction-operated ignition switch, detailing its benefits and installation.21th Sep 1932Box 37 \ 1  scan 209
Arguing against the fitting of a suction-operated ignition control switch, citing modern alternatives and increased unreliability.21th Sep 1932Box 37 \ 1  scan 210
Advantages of implementing an automatic ignition advance and retard system.28th Feb 1920Box 37 \ 1  scan 211


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