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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List of questions for Mr. Royce regarding issues with the battery ignition system.3rd Mar 1921Box 35 \ 6  scan 030
Extract discussing the materials and performance of the American Bosch Battery Ignition system.1st Jun 1922Box 35 \ 6  scan 031
The failure of Tungsten steel contact points for battery ignition after testing on a demonstration car.24th Mar 1921Box 35 \ 6  scan 032
Trial of tungsten contacts for battery ignition from C. Melin & Co.1st Apr 1921Box 35 \ 6  scan 033
Cover memo for an attached report concerning Tungsten points and their reaction to current density.7th Apr 1921Box 35 \ 6  scan 034
Technical memorandum discussing current density in tungsten contact points for various ignition systems.5th Apr 1921Box 35 \ 6  scan 035
Continued report on distributor sparking issues with tungsten contacts and proposed solutions.19th Jan 1921Box 35 \ 6  scan 036
Trial report on sample tungsten contacts for a magneto contact breaker.15th Apr 1921Box 35 \ 6  scan 037
Test report on sample tungsten contacts from Messrs. Blackwell.13th Apr 1921Box 35 \ 6  scan 038
Confirming receipt of 'Neo-Tungsten' ignition points from C.Melin & Co. for testing.1st Apr 1921Box 35 \ 6  scan 039
From EFC to EP requesting a report on the operation of a pair of tungsten contacts.6th May 1921Box 35 \ 6  scan 040
Proposal by Mr. Royce for an experiment on tungsten contacts in low tension make and break systems.7th May 1921Box 35 \ 6  scan 041
Instructions for arranging swivelling tungsten contact points on a distributor.9th May 1921Box 35 \ 6  scan 042
Instruction sheet with a diagram detailing the modification of a blade by bending it to a 30-degree angle.24th Jan 1919Box 35 \ 6  scan 043
The condition of a pair of Tungsten contacts after 1500 miles of use.24th May 1921Box 35 \ 6  scan 044
From EFC to FHC regarding a request from Mr. Royce to experiment with new tungsten points for battery ignition.1st Jun 1921Box 35 \ 6  scan 045
Instructions and drawings for scrubbing contact points, including a condenser contact, back-plate, and clamping bolt.1st Jun 1921Box 35 \ 6  scan 046
Instruction sheet with a schematic drawing of a screw-point mounting and blade.19th Aug 1921Box 35 \ 6  scan 047
Reports on the experimental running of tungsten contact points.6th Jun 1921Box 35 \ 6  scan 048
Test report on tungsten contact points from the Tungsten Manufacturing Co. under various electrical conditions.25th May 1921Box 35 \ 6  scan 049
Experiment investigating the effects of sparking on tungsten points.1st Jun 1921Box 35 \ 6  scan 050
Test report on tungsten contact points from Fansteel Co. U.S.A. after a 400-hour bench run.1st Jun 1921Box 35 \ 6  scan 051
The ongoing testing of tungsten contacts.15th Jun 1921Box 35 \ 6  scan 052
Follow-up memo regarding test results for Tungsten Contacts for Battery Ignition.15th Jun 1921Box 35 \ 6  scan 053
Parts from vehicles returned from America, evaluating the low tension contact maker, coil, and ballast resistance.21th Jun 1921Box 35 \ 6  scan 054
Extract regarding U.S.A. complaints about battery ignition systems and the reliability of tungsten versus platinum-iridium contact points.12th Jul 1921Box 35 \ 6  scan 055
Extract concerning American Bosch ignition on 4EX, specifically the durability of platinum iridium points.4th Aug 1921Box 35 \ 6  scan 056
Instruction sheet detailing further tests conducted on two different sets of tungsten contact points.13th Aug 1921Box 35 \ 6  scan 057
Instructions regarding the measurement and adjustment of spark-gap points.6th Nov 1918Box 35 \ 6  scan 058
Instruction sheet detailing engine test results, specifically issues with misfiring and contact sparking over a 150-hour run.6th Nov 1918Box 35 \ 6  scan 059
Test of tungsten points, noting discoloration, rust, and recommendations for the next test.6th Nov 1918Box 35 \ 6  scan 060
Instructions on using two condensers in parallel for ignition systems to improve sparking.6th Nov 1918Box 35 \ 6  scan 061
Instructions for determining ideal condenser capacity by creating a test series.16th Aug 1921Box 35 \ 6  scan 062
Requesting feedback on the performance of a batch of tungsten contact points.16th Aug 1921Box 35 \ 6  scan 063
Inquiring about the status and performance of tungsten contact points from a Delco Liberty ignition set.16th Aug 1921Box 35 \ 6  scan 064
Further tests and experiments with tungsten contact points.16th Aug 1921Box 35 \ 6  scan 065
The cause of roller rusting, suggesting it is due to oscillatory discharges and sparking.16th Aug 1921Box 35 \ 6  scan 066
Further tests of two sets of tungsten contact points supplied by the Fansteel Co.13th Aug 1921Box 35 \ 6  scan 067
Test report on misfiring, contact sparking, and component degradation during a 150-hour run.11th Aug 1930Box 35 \ 6  scan 068
Summary table of tests on tungsten contacts from various firms for high and low tension points.16th Aug 1921Box 35 \ 6  scan 069
Log sheet detailing tests and remarks on electrical contacts and rods from various suppliers.27th Sep 1920Box 35 \ 6  scan 070
Instruction sheet detailing the unsatisfactory performance of tungsten points after a 5,000-mile test.18th Mar 1921Box 35 \ 6  scan 071
Performance of a U.S.A. Bosch condenser compared to mica condensers and recommending further testing for the Goshawk 11.16th Sep 1921Box 35 \ 6  scan 072
Testing different condenser and tungsten point combinations for battery ignition systems.27th Sep 1921Box 35 \ 6  scan 073
Design and materials for an inexpensive condenser for an ignition system.1st Nov 1921Box 35 \ 6  scan 074
Investigations into various tungsten contact points for battery ignition systems.10th Nov 1921Box 35 \ 6  scan 075
Technical report on testing paper and mica condensers, and tungsten contacts for ignition systems.10th Nov 1921Box 35 \ 6  scan 076
The performance tests of Melin tungsten contact points.19th Sep 1921Box 35 \ 6  scan 077
Test report on the performance of tungsten contacts when run on a lower voltage.6th Oct 1921Box 35 \ 6  scan 078
Test report on tungsten contact points with double capacity at 6 volts to reduce sparking.7th Nov 1921Box 35 \ 6  scan 079
Tests of distributors and condensers, proposing further testing on American ignition sets.25th Nov 1921Box 35 \ 6  scan 080
The trial of tungsten points for the Goshawk ignition system.25th Nov 1921Box 35 \ 6  scan 081
Request for Goshawk II distributor contact points, specifying tungsten points from supplier Messrs. Melin over Messrs. Reynolds.1st Dec 1921Box 35 \ 6  scan 082
Carbon copy of a note regarding an order for low tension contact rivets and screws.7th Dec 1921Box 35 \ 6  scan 083
Request for a report on the behaviour of tungsten contact points on the Demonstration Car.23th Dec 1921Box 35 \ 6  scan 084
Telephone message regarding a C.A.V. battery and Tungsten Points on a School Car.2nd Jan 1922Box 35 \ 6  scan 085
Letter from supplier C. Melin & Co. clarifying whether an enquiry for rivets and screws is for use with magnetos or battery work.2nd Jan 1922Box 35 \ 6  scan 086
The wear and performance of iridium-platinum versus tungsten ignition points on experimental cars.4th Jan 1922Box 35 \ 6  scan 087
Log sheet recording tests and remarks for tungsten contacts supplied by Tungsten Mfg. Co. and Fansteel Co.18th Aug 1921Box 35 \ 6  scan 088
Log of tests and remarks on ignition components from various firms.18th Aug 1921Box 35 \ 6  scan 089
Log tracking the specifications and testing history of ignition components supplied by Reynolds & Co.28th Sep 1920Box 35 \ 6  scan 090
Log sheet tracking parts or components, their specifications, and testing history.11th Jan 1924Box 35 \ 6  scan 091
Letter from C. Melin & Co. regarding samples and pricing for contact screws.9th Jan 1922Box 35 \ 6  scan 092
Test report on Tungsten Points with a Paper Condenser after 65 hours of running.24th Jul 1922Box 35 \ 6  scan 093
Instruction sheet detailing the observation of increasing sparking and deterioration of contacts over time.24th Jul 1922Box 35 \ 6  scan 094
Requesting the fitting of tungsten points to Goshawk ignition levers for testing.8th Aug 1922Box 35 \ 6  scan 095
'Eska' tungsten contact points received from C. Melin & Co. to be fitted to a Goshawk vehicle.8th Sep 1922Box 35 \ 6  scan 096
Request for a report on the behaviour of 'Normal' and 'Eska' tungsten contact points for a Goshawk.19th Jan 1923Box 35 \ 6  scan 097
Endurance tests of Goshawk contact breaker and distributor, comparing rubbing blocks and testing tungsten points.15th Feb 1923Box 35 \ 6  scan 098
Endurance test report for a Goshawk distributor, focusing on bakelite rubbing block wear.30th Oct 1922Box 35 \ 6  scan 099
Test report on a distributor, detailing wear, corrosion, and changes in spring load and platinum point gap.29th Jan 1923Box 35 \ 6  scan 100
Endurance test report for parts fitted to a Goshawk ignition system.29th Jan 1923Box 35 \ 6  scan 101
The wear of a bakelite block and corrosion of sparking points and a rotor after a 4,000-mile test.16th Feb 1923Box 35 \ 6  scan 102
Handing over of a pair of 'normal' tungsten contact points for a Goshawk engine.16th Feb 1923Box 35 \ 6  scan 103
The purchase of 'Eska' quality tungsten contact points for Goshawk ignition experiments.15th May 1923Box 35 \ 6  scan 104
Endurance tests of a Goshawk contact breaker and distributor, comparing different rubbing blocks and testing tungsten contact points.15th Mar 1923Box 35 \ 6  scan 105
Supply and fitting of 'Eska' tungsten contact points for a 20 HP model.17th Jul 1923Box 35 \ 6  scan 106
Letter detailing the dispatch of an updated contact breaker lever and a higher temperature dynamo sentinel for a school car.17th Jul 1923Box 35 \ 6  scan 107
Fitting and testing of two sets of tungsten contact points for Goshawk chassis.31th Aug 1923Box 35 \ 6  scan 108
Fitting of tungsten contact points for a 20 HP model to chassis 3GII.4th Oct 1923Box 35 \ 6  scan 109
Fitting one pair of tungsten contact points to chassis 3GII and another pair to chassis 7GII.11th Oct 1923Box 35 \ 6  scan 110
Confirming the fitting of tungsten contact points to specific chassis.16th Oct 1923Box 35 \ 6  scan 111
The examination of Eska tungsten points on models 3GII and 7GII which are burning away.14th Nov 1923Box 35 \ 6  scan 112
Summary of reports on the Goshawk battery ignition distributor and contact breaker.25th Feb 1924Box 35 \ 6  scan 113
Bench test report on Goshawk ignition parts after a 10,000-mile endurance test.31th Jan 1924Box 35 \ 6  scan 114
Inspection report on the wear and performance of Tungsten Points AQ and AR after road testing.20th Feb 1924Box 35 \ 6  scan 115
Preventing pip formation in electrical contacts by reversing current.22th Feb 1924Box 35 \ 6  scan 116
Test house report on tungsten contact points AC and AR.22th Feb 1924Box 35 \ 6  scan 117
The wear of standard Bakelite contact breaker rubbing blocks on various cars.22th Feb 1924Box 35 \ 6  scan 118
Electrical experimental record sheet for Eska Tungsten Points.1st Nov 1923Box 35 \ 6  scan 119
Recommendation to use tungsten points instead of platinum for battery ignition systems.3rd Apr 1934Box 35 \ 6  scan 120
Fitting the last set of Eska tungsten contact points designated AS.24th Apr 1924Box 35 \ 6  scan 121
Mileage report for Eska Tungsten Points fitted to two vehicles.25th Apr 1924Box 35 \ 6  scan 122
Extract detailing the satisfactory performance of 'Eska' tungsten points following mileage tests.29th Apr 1924Box 35 \ 6  scan 123
Electrical experimental record sheet for Eska Tungsten Points.29th Oct 1923Box 35 \ 6  scan 124
Report comparing the performance of platinum versus tungsten interrupter points, coils, and condensers.11th Jun 1926Box 35 \ 6  scan 125
Performance and testing of American Bosch and Delco coils and condensers.11th Jun 1926Box 35 \ 6  scan 126
Inspection report on the wear of Eska Tungsten points from a Goshawk distributor after 11,587 miles.26th Jun 1924Box 35 \ 6  scan 127
Instruction sheet detailing the condition and performance of engine contact points after a chassis test.28th Jun 1920Box 35 \ 6  scan 128
Querying a change of distributor parts from a 6-GII to a 7-GII and requesting clarification to update records.13th Aug 1924Box 35 \ 6  scan 129


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