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
Letter discussing the inter-connection of magneto and battery ignition for airship engines.16th Oct 1917Box 37 \ 1  scan 012
Implications of replacing the hand magneto with a battery ignition system for aero engines.7th Oct 1917Box 37 \ 1  scan 013
Magneto and battery ignition systems for engine starting and performance.26th Apr 1917Box 37 \ 1  scan 014
The interconnection of magneto and battery controls for airship engines.18th Oct 1917Box 37 \ 1  scan 015
Cover sheet regarding battery ignition, referencing other documents.18th Oct 1917Box 37 \ 1  scan 016
Adjustments to the Remy battery ignition's automatic advance range to prevent misfiring on an airship engine.27th Oct 1917Box 37 \ 1  scan 017
The effects of syringing water onto an engine's distributor and coil during operation.30th Oct 1917Box 37 \ 1  scan 018
From EH detailing Mr. Royce's thoughts on the manufacture of epicyclic gears and battery ignition development.30th Oct 1917Box 37 \ 1  scan 019
Confirming an instruction to build an experimental ignition coil and outlining further investigation into battery ignition for aero engines.26th Apr 1917Box 37 \ 1  scan 020
Request for the return of a contact breaker from a Delco ignition system for comparison purposes.8th Nov 1917Box 37 \ 1  scan 021
Cover memo for a tabular comparison of Remy and Delco ignition systems, with notes on future experiments for a proprietary design.9th Nov 1917Box 37 \ 1  scan 022
Impracticality of using battery ignition for engines 2100-2600 and recommending sticking with magnetos.29th Nov 1917Box 37 \ 1  scan 023
100 Hour Test for the 'Eagle' engine, specifically regarding the fitting of battery ignition and a new articulated connecting rod pin.15th Jan 1918Box 37 \ 1  scan 024
Surprisingly high efficiency of a Lucas starter motor and arranging a meeting to discuss efficient battery ignition.15th Apr 1918Box 37 \ 1  scan 025
Extract describing the battery ignition system for Liberty engines.15th Apr 1918Box 37 \ 1  scan 026
Development of a single coil battery ignition system for the 'Condor' engine.24th Apr 1918Box 37 \ 1  scan 027
Ignition system design and firing timing, comparing the 'Liberty' engine to the 'Condor' engine.24th Apr 1918Box 37 \ 1  scan 028
'Liberty' battery ignition system and potential improvements for a coil design.4th May 1918Box 37 \ 1  scan 029
Discussion comparing battery and magneto ignition systems and their performance in engines like the 'Falcon' and 'Condor'.4th May 1918Box 37 \ 1  scan 030
Ignition contact breaker proportions and safety settings to prevent engine reversal.4th May 1918Box 37 \ 1  scan 031
Ignition plug failures due to sooty deposits and the potential advantages of a jump spark distributor.14th May 1918Box 37 \ 1  scan 032
The design and performance of a battery ignition distributor, comparing it to Delco schemes.30th May 1918Box 37 \ 1  scan 033
Ignition systems, back-firing issues, and proposed improvements in collaboration with the Air Board.30th May 1918Box 37 \ 1  scan 034
Issues with battery ignition, including running backwards and wear on platinum points.12th Jun 1918Box 37 \ 1  scan 035
From R. to EFC discussing how a Falcon engine could run backwards with specific ignition arrangements.15th Feb 1918Box 37 \ 1  scan 036
Examination of the conditions under which an aero engine can run backwards on battery ignition.1st Jul 1918Box 37 \ 1  scan 037
Analysis of ignition timing, the contact breaker, and the potential for an engine to run backwards.22th Jul 1918Box 37 \ 1  scan 038
Page discussing engine ignition behaviour, specifically kick-back, backward running, and spark timing.22th Jul 1918Box 37 \ 1  scan 039
Continued discussion on engine timing, spark advance, and preventing backward running in an engine.22th Jul 1918Box 37 \ 1  scan 040
Preventing backward engine running by modifying the distributor and contact breaker.22th Jul 1918Box 37 \ 1  scan 041
Meeting with the Delco Company regarding battery ignition distributors and a manufacturing proposal.6th Dec 1918Box 37 \ 1  scan 042
Discussion with a supplier about manufacturing ignition apparatus, including the reliability of tungsten versus platinum terminals.26th Apr 1917Box 37 \ 1  scan 043
Technical discussion on tungsten oxides in relation to current density and criticisms of ignition break mechanisms.26th Apr 1917Box 37 \ 1  scan 044
The design flaws of a carbon brush mechanism and a disagreement over the need for reinforcement material.17th Apr 1918Box 37 \ 1  scan 045
Visit to the Delco factory regarding experimental battery ignition for the Eagle engine.17th Apr 1918Box 37 \ 1  scan 046
Comparison between Delco and Remy ignition distributors, with a discussion on carbon contacts versus jump spark systems.17th Apr 1918Box 37 \ 1  scan 047
Analysis of the Liberty distributor, detailing the materials, dimensions, and firing intervals of its contacts.17th Apr 1918Box 37 \ 1  scan 048
Technical discussion comparing Bakelite and hard rubber distributor materials and issues with charring.17th Apr 1918Box 37 \ 1  scan 049
Notes on the design and performance of the Remy ignition contact breaker, including materials and high-speed limitations.17th Apr 1918Box 37 \ 1  scan 050
The design of a contact breaker's dual rocker system, its wear characteristics, and the function of an auxiliary rocker to prevent back-firing.17th Apr 1918Box 37 \ 1  scan 051
Features of Delco contact breakers, generators, brushes, and voltage regulators, comparing them with other systems for aero and automobile engines.17th Apr 1918Box 37 \ 1  scan 052
Delco's dynamos and starting motors, including design choices and issues with early free-wheel models.17th Apr 1918Box 37 \ 1  scan 053
Continued description of a hardened gear and pressing a ground band into a soft wheel for a free wheel mechanism.17th Apr 1918Box 37 \ 1  scan 054
Requesting the production of four small ignition condensers for experiments, with a table of specifications.12th Dec 1918Box 37 \ 1  scan 055
Letter from the Remy Electric Company arranging a meeting and discussing contacts.1st Jan 1919Box 37 \ 1  scan 056
Modifying instructions for condensers used in battery ignition, detailing new specifications and capacities.3rd Jan 1919Box 37 \ 1  scan 057
Meeting with representatives from Delco and Remy regarding 'Liberty' ignition distributors.14th Jan 1919Box 37 \ 1  scan 058
Proposal from the Delco Company to manufacture ignition apparatus, listing various American cars and aero engines as examples.14th Jan 1919Box 37 \ 1  scan 059
Report listing various engine types and discussing the sourcing and analysis of ignition points.14th Jan 1919Box 37 \ 1  scan 060
Possibility of custom-making dynamos and a request for an interview with Mr. Royce.14th Jan 1919Box 37 \ 1  scan 061
Comparison of performance between trembler and non-trembler ignition systems on an experimental car.26th Sep 1919Box 37 \ 1  scan 062
Typed memorandum regarding the deterioration of an ignition system.26th Sep 1919Box 37 \ 1  scan 063
Sourcing, analysis, and workability of metallic tungsten for high and low tension contacts.20th Oct 1919Box 37 \ 1  scan 064
Alternative materials like Nickel and Tantalum for chassis rotors and a plan for further testing.20th Oct 1919Box 37 \ 1  scan 065
Chassis battery ignition experiments, specifically investigating spark length variations.20th Jan 1920Box 37 \ 1  scan 066
Calculated current figures for a coil at 500 R.P.M.20th Jan 1920Box 37 \ 1  scan 067
The loss of spark length in a chassis battery ignition system due to a second variable gap.5th Jan 1920Box 37 \ 1  scan 068
Article from 'The Motor' magazine describing a new ignition system using a condenser charged by dry cells.14th Jan 1920Box 37 \ 1  scan 069
Article about a new ignition system and spherical valve, and a guide to UK car licensing fees and procedures.14th Jan 1920Box 37 \ 1  scan 070
The Terry Ignition System, a battery and condenser system producing efficient sparking with low current consumption.14th Jan 1920Box 37 \ 1  scan 071
Explanation of the 'K' formula for measuring engine capacity and performance, using a bicycle as an initial example.4th Mar 1920Box 37 \ 1  scan 072
Request for two blueprints of tracings of curves in connection with battery ignition.4th Mar 1920Box 37 \ 1  scan 073
Tree diagram of battery ignition systems and their corresponding coil numbers.29th Jun 1920Box 37 \ 1  scan 074
Analysis of the automatic and hand control ignition advance on a Packard 12-cylinder engine, with test results.25th Jun 1920Box 37 \ 1  scan 075
Ignition timing settings at various RPMs and analysis from bench tests on a Packard car.25th Jun 1920Box 37 \ 1  scan 076
Page discussing the need to retard ignition by hand control to prevent engine detonation due to carbon build-up.1st Jun 1920Box 37 \ 1  scan 077
Fitting self-starters to earlier cars, discussing the risks of backfires and pre-ignition with different ignition systems.1st Aug 1920Box 37 \ 1  scan 078
Priming cars to avoid the risk of backfire and the recommendation to fit a self-starter.20th Aug 1920Box 37 \ 1  scan 079
Reprint from 'The Autocar' magazine describing the Conner Battery Ignition System.25th Sep 1920Box 37 \ 1  scan 080
Detailed description of the features, construction, and operation of a special ignition coil.25th Sep 1920Box 37 \ 1  scan 081
Reprint from 'The Autocar' magazine describing the Conner Battery Ignition System.25th Sep 1920Box 37 \ 1  scan 082
Detailed description of an ignition coil, its special features, construction, and operation.27th Nov 1920Box 37 \ 1  scan 083
Utility test of a spark-coil or magneto.27th Nov 1920Box 37 \ 1  scan 084
'Utility Test' experiment involving electrical resistance.24th Jan 1919Box 37 \ 1  scan 085
Test results for various electrical coil configurations.24th Jan 1919Box 37 \ 1  scan 086
Utility test report for a Watford E6 magneto, reference X3199.10th Dec 1920Box 37 \ 1  scan 087
Utility test results for magnetos, detailing maximum gap measurements under various coil and primary circuit conditions.24th Jan 1919Box 37 \ 1  scan 088
Instructions for a utility test of a spark-coil, noting distributor modifications and test conditions.15th Dec 1920Box 37 \ 1  scan 089
Winding test of a spark-coil, comparing its performance against a Watford E6 magneto.30th Dec 1920Box 37 \ 1  scan 090
The effect of an auxiliary external gap in enhancing sparking at the main gap under adverse conditions.1st Jan 1921Box 37 \ 1  scan 091
Describing the 'Utility' test procedure for spark coils and magnetos.7th Jan 1921Box 37 \ 1  scan 092
Comparison of magneto and battery ignition systems, discussing trial results and leakage path effects.7th Jan 1921Box 37 \ 1  scan 093
Comparative sparking test between a Watford E.6 Magneto and a standard battery ignition system on a utility test.21th Dec 1920Box 37 \ 1  scan 094
Inquiry into why tungsten points are not durable in a 12-volt ignition system compared to a 6-volt Delco system.26th Jan 1921Box 37 \ 1  scan 095
Issues with U.S.A. electrical ignition equipment and comparing it to Bosch and in-house designs.16th Feb 1921Box 37 \ 1  scan 096
List of questions for Mr. Royce concerning battery ignition systems.3rd Mar 1921Box 37 \ 1  scan 097
Forwarding notes, corrected and added to by Mr. Royce, concerning Mr. Clark's visit to West Wittering.1st Apr 1921Box 37 \ 1  scan 098
List of points for attention regarding vehicle electrical systems following a visit by Mr. Clark.28th Feb 1921Box 37 \ 1  scan 099
List of specifications and actions for the development of dynamos and motors for large and small cars.1st Mar 1921Box 37 \ 1  scan 100
Improvements to a Watford machine and comparing various magneto suppliers.3rd Mar 1921Box 37 \ 1  scan 101
Pre-ignition issues caused by mutual induction in double battery ignition systems.12th Apr 1921Box 37 \ 1  scan 102
Pre-ignition problems caused by mutual induction effects from using double ignition systems.14th Apr 1921Box 37 \ 1  scan 103
Specifications and effects of braided high tension cable for aero engines used with wireless systems.11th May 1921Box 37 \ 1  scan 104
The second and final page of a memo returning correspondence on a matter concerning cylinders.11th May 1921Box 37 \ 1  scan 105
Letter discussing cost-saving design changes for a distributor and contact breaker.25th May 1921Box 37 \ 1  scan 106
Technical description of the Rotor, Cam, Condenser, and Advance Mechanism of an ignition system.25th May 1921Box 37 \ 1  scan 107
Report comparing design aspects of distributor mechanisms, including drive, bearings, and ventilation.25th May 1921Box 37 \ 1  scan 108
The design, materials, and insulation of a rocker component.25th May 1921Box 37 \ 1  scan 109
Hand-drawn sketch detailing the cross-section of a typical American battery ignition distributor and contact breaker.1st Jun 1921Box 37 \ 1  scan 110
From Mr. Olley discussing reports on ignition systems, comparing Delco, Bosch, and other American equipment.1st Jun 1921Box 37 \ 1  scan 111


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