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
Advertisement leaflet for the ARIS High Tension Connector.8th Mar 1920Box 33 \ 3  Scan054
Advertisement for Aris Sparking Plugs, detailing different models and their construction.8th Mar 1920Box 33 \ 3  Scan055
Advertising leaflet for the 'ARIS' Sparking Plug, detailing its features and benefits.8th Mar 1920Box 33 \ 3  Scan056
Advertisement for a High Tension Connector from The British Aris Sparking Plug Company.8th Mar 1920Box 33 \ 3  Scan057
Product information sheet for a high tension sparking plug connector.8th Mar 1920Box 33 \ 3  Scan058
Advertisement and description for the 'ARIS' Sparking Plug.8th Mar 1920Box 33 \ 3  Scan059
Advertisement for ARIS sparking plugs, showing various models and a detailed cross-section.8th Mar 1920Box 33 \ 3  Scan060
Letter from The British Aris Sparking Plug Co. Ltd. promoting their spark plugs and high-tension wire connectors.8th Mar 1920Box 33 \ 3  Scan061
Letter from a supplier offering to send samples of Motor Car Plugs.12th Mar 1920Box 33 \ 3  Scan062
Letter concerning an enquiry for motor car plugs from the Federal Company of the States.23th Mar 1920Box 33 \ 3  Scan063
Letter from The Forward Sparking Plug Co. regarding the supply and testing of 'E' type spark plugs.26th Mar 1920Box 33 \ 3  Scan064
Letter regarding the dispatch and comparative performance of various spark plug brands, including Herz, A.C., and Champion.22th May 1920Box 33 \ 3  Scan065
To F.H. Royce discussing different types of spark plugs and their performance.22th May 1920Box 33 \ 3  Scan066
Development of new spark plugs by the Flint Company and the American Bosch Co.22th May 1920Box 33 \ 3  Scan067
The testing of 'Vallier' Spark Plugs from Messrs. Parker & French.1st Jun 1920Box 33 \ 3  Scan068
Suitability of a sample American-made, single-point plug for the chassis.28th Jun 1920Box 33 \ 3  Scan069
Letter from an agent offering 'Express Spark Plugs' for trial and sale for use in aviation engines.24th Jun 1920Box 33 \ 3  Scan070
Bureau of Standards report on an endurance test conducted on Duffy 'Air-Line' spark plugs.17th Aug 1917Box 33 \ 3  Scan071
Advertisement for Express spark-plugs, highlighting their performance in oily motors.24th Jul 1920Box 33 \ 3  Scan072
Allocation of work on magnetos, ignition, and sparking plugs.24th Jul 1920Box 33 \ 3  Scan073
Letter regarding the sending of six Bougie Gilardoni Sparking Plugs for testing.27th Jul 1920Box 33 \ 3  Scan074
Letter arranging for six Gilardoni sparking plugs to be sent for testing.23th Jul 1920Box 33 \ 3  Scan075
Forwarding of A.C. 'Titan' single-point sparking plugs for testing.29th Jul 1920Box 33 \ 3  Scan076
Authorising an order for 5000 sparking plugs and agreeing to increase the minimum order number.10th Aug 1920Box 33 \ 3  Scan077
Suitability of Lodge mica ignition plugs compared to porcelain and K.L.G. types.10th Sep 1920Box 33 \ 3  Scan078
Cleanability and design of various spark plugs.10th Sep 1920Box 33 \ 3  Scan079
Inspection of the 1.EX engine, detailing issues with ignition and valve clearance at low speeds.10th Sep 1920Box 33 \ 3  Scan080
Method for cleaning sooted Lodge sparking plugs.10th Sep 1920Box 33 \ 3  Scan081
Minute from a conference in Derby regarding the decision to use two sources of supply for batteries and sparking plugs.16th Sep 1920Box 33 \ 3  Scan082
Ongoing testing and evaluation of ignition plugs, specifically the Lodge C.9, and the strategy for sourcing them.4th Oct 1920Box 33 \ 3  Scan083
Use and comparison of American Champion and Lodge spark plugs.4th Oct 1920Box 33 \ 3  Scan084
Ripaults Oleo Plugs being used in the winning machine of the Gordon-Bennett Cup race.11th Oct 1920Box 33 \ 3  Scan085
Points for attention following an American visit, concerning rear springs, steering pivots, and ignition issues.11th Nov 1920Box 33 \ 3  Scan086
Unsatisfactory spark plugs and magneto failures, suggesting alternative parts and design changes.11th Nov 1920Box 33 \ 3  Scan087
Chassis 39-TW, discussing improvements to ignition plugs and condensers.12th Nov 1920Box 33 \ 3  Scan088
Results of further tests for leaky sparking plugs.22th Nov 1920Box 33 \ 3  Scan089
Various points following a visit to America, covering ignition, magnetos, and other vehicle components.22th Nov 1920Box 33 \ 3  Scan090
Article from 'The Motor' magazine about the construction of modern sparking plugs using mica.29th Dec 1920Box 33 \ 3  Scan091
Article from 'The Motor' magazine describing the manufacturing process and testing of mica spark plugs, specifically the detachable 'G' type K.L.G. plug.29th Dec 1920Box 33 \ 3  Scan092
Instruction note comparing the performance of different spark plug brands.3rd Jan 1921Box 33 \ 3  Scan093
Requesting information on the position of plugs in an engine, whether pocket or central.4th Jan 1921Box 33 \ 3  Scan094
Test report comparing the performance of various spark plugs under different conditions.17th Jan 1921Box 33 \ 3  Scan095
Test log for various spark plugs, detailing results of mixture, insulation, oiling, and pre-ignition tests.20th Jan 1921Box 33 \ 3  Scan096
Returning Heath spark plugs after testing revealed them to be the worst performing.13th Jan 1921Box 33 \ 3  Scan097
Proposed new sparking plug and its claimed advantages.21th Jan 1921Box 33 \ 3  Scan098
Unsatisfactory testing results of Heath spark plugs in cars and aero engines.3rd Feb 1921Box 33 \ 3  Scan099
The procedures for testing various makes of sparking plugs.1st Feb 1921Box 33 \ 3  Scan100
Test report on various types of spark plugs.9th Feb 1921Box 33 \ 3  Scan101
Results of tests on various spark plugs, providing a ranking and a recommendation for purchase.9th Feb 1921Box 33 \ 3  Scan102
Forwarding a letter from Heath Plugs Ltd. and discussing associated test reports.2nd Feb 1921Box 33 \ 3  Scan103
Letter and test reports for Heath Plugs.11th Feb 1921Box 33 \ 3  Scan104
Letter from Heath Plugs, Limited, defending their spark plug design against claims of sooting and oiling up.9th Feb 1921Box 33 \ 3  Scan105
Page 2 of a letter from Heath Plugs Ltd. regarding the superiority of their sparking plugs.10th Dec 1930Box 33 \ 3  Scan106
Inclusion of a slow running test for sparking plugs and its long-term reliability.4th Feb 1921Box 33 \ 3  Scan107
Comparing different types of sparking plugs.16th Feb 1921Box 33 \ 3  Scan108
Conclusion to standardise Champion (Canadian make) and Mercury (Birmingham make) components for cars.16th Feb 1921Box 33 \ 3  Scan109
Requesting an update on the action taken with reference to a sparking plug.21th Feb 1921Box 33 \ 3  Scan110
Performance and recommendation of various sparking plug brands such as Champion, Mercury, and Lodge.2nd Feb 1921Box 33 \ 3  Scan111
Proposal for a cost-saving plug repair and exchange system for Mercury plugs.2nd Feb 1921Box 33 \ 3  Scan112
Extract from a letter from C.A. Vandervell & Co. Ltd. announcing new C.A.V. sparking plugs.1st Mar 1921Box 33 \ 3  Scan113
Letter from Barracloughs (Engineers) Ltd offering a sample of their improved 'Bradford' Patent spark plug for testing.7th Mar 1921Box 33 \ 3  Scan114
Returning correspondence regarding sparking plugs from General Instrument and Engineering Co. Ltd.7th Mar 1921Box 33 \ 3  Scan115
Suspected pre-ignition issues with 'Mercury' plugs due to their porcelain design.9th Mar 1921Box 33 \ 3  Scan116
Letter from Garage 'Service' Equipment Ltd. offering a set of 'Molla Plugs' for trial.9th Mar 1921Box 33 \ 3  Scan117
Price list for spare parts from The British Molla Plug Co.9th Mar 1921Box 33 \ 3  Scan118
Exploded view diagram and spare parts price list for the Molla Plug.9th Mar 1921Box 33 \ 3  Scan119
Instructional leaflet for the Molla Sparking plug No. 6, detailing its disassembly and regulation.9th Mar 1921Box 33 \ 3  Scan120
Advertising leaflet comparing the cost and features of the 'Molla Plug' against a generic alternative.9th Mar 1921Box 33 \ 3  Scan121
Advertisement for the 'Over All' or 'O.A.P.' two-piece detachable sparking plug.16th Mar 1921Box 33 \ 3  Scan122
Requesting a halt to sending spark plugs for testing, with a specific request for a 'Molla' plug for inspection.16th Mar 1921Box 33 \ 3  Scan123
Arranging for a Molia plug to be sent from Garage 'Service' Equipment Ltd.18th Mar 1921Box 33 \ 3  Scan124
On testing ignition plugs, noting the failure of a Champion plug and suggesting modifications for Mercury plugs.1st Apr 1921Box 33 \ 3  Scan125
Performance issues of Watford magnetos and Lodge spark plugs, referencing a report by PN.25th Apr 1921Box 33 \ 3  Scan126
Sales letter from Universal Engineering Co. promoting Igna Sparking Plugs.25th Apr 1921Box 33 \ 3  Scan127
Advertisement for IGNA sparking plugs, detailing various models and prices.5th May 1921Box 33 \ 3  Scan128
Recommendations on magneto requirements for the 40/50 engine, comparing different magneto and spark plug types.5th May 1921Box 33 \ 3  Scan129
Tests carried out on ignition coils with varying secondary turns.5th May 1921Box 33 \ 3  Scan130
Magneto ignition requirements and spark gap issues for the 40/50 HP chassis.10th May 1921Box 33 \ 3  Scan131
Report discussing engine firing irregularities, focusing on magneto performance, spark plugs, and carburation.5th May 1921Box 33 \ 3  Scan132
Magneto ignition requirements, discussing irregular firing and issues with spark plug positioning on 40/50 HP cars.10th May 1921Box 33 \ 3  Scan133
Spark plug and magneto performance related to engine slow running, overheating, and oiling issues.10th May 1921Box 33 \ 3  Scan134
Advertising leaflet for the Fisher Plug, detailing its features and principle of operation.10th May 1921Box 33 \ 3  Scan135
Instructions for the removal and replacement of the Fisher Plug.30th May 1921Box 33 \ 3  Scan136
Report condemning the 'Fisher' sparking plug due to design flaws, a doubtful patent, and high cost.30th May 1921Box 33 \ 3  Scan137
Instructing to halt the testing of the Fisher Sparking Plug.2nd Jun 1921Box 33 \ 3  Scan138
The trial of experimental sparking plugs for chassis No. 79-TW.10th Jun 1921Box 33 \ 3  Scan139
Requesting the return of a loaned Fisher Sparking Plug sample.13th Jun 1921Box 33 \ 3  Scan140
The despatch of a sample Fisher Sparking Plug to a client.15th Jun 1921Box 33 \ 3  Scan141
Advertisement for a dashboard-mounted Manifold Ignition Indicator & Plug Tester.6th Jul 1921Box 33 \ 3  Scan142
Extract from a report discussing issues with spark plug positioning for cars destined for America.6th Jul 1921Box 33 \ 3  Scan143
Page 2 of a document concerning the position, type, and gap of plugs and compressions.1st Jan 1948Box 33 \ 3  Scan144
Position of sparking plugs for cars intended for the American market.6th Jul 1921Box 33 \ 3  Scan145
Letter regarding the submission of 13 plugs for testing and a discussion of patent rights.12th Jul 1921Box 33 \ 3  Scan146
Requesting tests to be carried out on one dozen AC Plugs No.18 CPT from The A.C. Sparking Plug Co. Ltd.16th Jul 1921Box 33 \ 3  Scan147
Letter from A.C. Sparking Plug Co. Ltd. regarding the supply of spark plugs No.18 CPT for testing.8th Jul 1921Box 33 \ 3  Scan148
Letter from AC Sparking Plug Co. Ltd. promoting their spark plugs following success at the Le Mans Grand Prix.29th Jul 1921Box 33 \ 3  Scan149
French advertisement comparing the cost-effectiveness and features of the 'BOUGIE MOLLA' spark plug against a generic competitor.29th Jul 1921Box 33 \ 3  Scan150
Instruction leaflet for the demountable and adjustable Molla No. 6 spark plug.4th Aug 1921Box 33 \ 3  Scan151
From CJ to the Experimental Department regarding the testing of an enclosed 'Silca' plug from a customer.4th Aug 1921Box 33 \ 3  Scan152
Requesting advice on which make and quantity of sparking plugs to order as stock is at a minimum.13th Aug 1921Box 33 \ 3  Scan153


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