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
Technical memorandum discussing pre-ignition issues caused by Champion ignition plugs.9th Sep 1921Box 33 \ 3  Scan154
Selection and performance of spark plugs in various engines.9th Sep 1921Box 33 \ 3  Scan155
Follow-up on the trial of French-made sparking plugs offered by a customer for chassis 79-TW.9th Sep 1921Box 33 \ 3  Scan156
Requesting an update on the testing of a 'Silca' plug.9th Sep 1921Box 33 \ 3  Scan157
Cover of a document titled 'Spark Plug Logic', featuring an illustration of a spark plug.9th Sep 1921Box 33 \ 3  Scan158
The stagnation in spark plug design and the problems with various insulating materials.13th Sep 1921Box 33 \ 3  Scan159
Follow-up memo from CJ to the Experimental Dept. regarding the testing of a plug.13th Sep 1921Box 33 \ 3  Scan160
Test report on a 'Silca' sparking plug.9th Sep 1921Box 33 \ 3  Scan161
Testing of a spark plug and proposing design improvements.9th Sep 1921Box 33 \ 3  Scan162
Letter from George Roberts following up on sparking plugs sent for testing and offering patent rights.16th Sep 1921Box 33 \ 3  Scan163
Request to return a tested sparking plug to Captain Withers.17th Sep 1921Box 33 \ 3  Scan164
Arranging the return of a 'Silec' Plug to Captain Withers.17th Sep 1921Box 33 \ 3  Scan165
Letter regarding the testing of a 'Silca' spark plug and a request for its return.16th Sep 1921Box 33 \ 3  Scan166
Instructing the stores to despatch a 'Silca' sparking plug for testing.19th Sep 1921Box 33 \ 3  Scan167
Letter regarding pre-ignition issues with ignition plugs and the successful testing of new Champion plugs.20th Sep 1921Box 33 \ 3  Scan168
Sales letter from The Anger Manufacturing & Supply Co Ltd regarding their 'AMASCO' Sparking Plugs.20th Sep 1921Box 33 \ 3  Scan169
Page two of a letter from The Anger Manufacturing & Supply Co. Ltd. proposing a trial order for 'AMASCO' sparking plugs.20th Sep 1921Box 33 \ 3  Scan170
Advertisement for 'The Anger Amasco Plug', an all-British-made sparking plug.22th Sep 1921Box 33 \ 3  Scan171
Letter responding to a query about a non-receipt of spark plugs and requesting dispatch details.22th Sep 1921Box 33 \ 3  Scan172
Letter from George Roberts of Peek, Frean & Co. Ltd. confirming a recent inquiry about 'Prima' sparking plugs.22th Sep 1921Box 33 \ 3  Scan173
Letter from George Roberts concerning a parcel of Sparking Plugs that may have been misplaced upon arrival.23th Sep 1921Box 33 \ 3  Scan174
Letter from George Roberts sending 'Prima' sparking plugs for testing and offering the UK manufacturing and sales rights.12th Jul 1921Box 33 \ 3  Scan175
Letter regarding a lost parcel of plugs sent to the Experimental Dept, requesting a new sample for a preliminary report.24th Sep 1921Box 33 \ 3  Scan176
Request to search for a customer's misplaced spark plugs sent for experimentation.26th Sep 1921Box 33 \ 3  Scan177
Letter from Philip Challis regarding a report on the design features of the Silca Sparking-Plug.25th Sep 1921Box 33 \ 3  Scan178
Letter from George Roberts regarding a missing correspondence and offering to send a new series of 12 plugs for trial.26th Sep 1921Box 33 \ 3  Scan179
From 'R' discussing the testing of Spinx spark plugs as a potential alternative to unreliable Mercury plugs.10th Oct 1921Box 33 \ 3  Scan180
Follow-up communication awaiting a reply regarding plugs sent by Mr. G. Roberts for chassis 79-TW.4th Oct 1921Box 33 \ 3  Scan181
Correspondence regarding the misplacement of sparking plugs sent by G. Roberts Esq. for testing.10th Oct 1921Box 33 \ 3  Scan182
Letter from George Roberts sending 'Prima' spark plugs for testing, noting a potential thread incompatibility.13th Oct 1921Box 33 \ 3  Scan183
Letter acknowledging the receipt of 7 Prima Sparking Plugs for a future report.15th Oct 1921Box 33 \ 3  Scan184
Letter regarding the submission of two sets of 'Prima' sparking plugs for testing.29th Oct 1921Box 33 \ 3  Scan185
Postcard addressed to the Experimental Department in Derby.29th Oct 1921Box 33 \ 3  Scan186
Second set of plugs for Chassis 79-TW.2nd Nov 1921Box 33 \ 3  Scan187
Opportunity to acquire manufacturing rights for special plugs from a French inventor.31th Oct 1921Box 33 \ 3  Scan188
Letter from AC Sparking Plug Co. Ltd. confirming a quotation and announcing a new English-made plug.31th Oct 1921Box 33 \ 3  Scan189
Letter from George Roberts confirming the despatch of six Prima Sparking Plugs for testing.8th Nov 1921Box 33 \ 3  Scan190
Follow-up note regarding the performance of a set of Prima Sparking Plugs, attached to the original letter.23th Nov 1921Box 33 \ 3  Scan191
Chasing a response for Mr. George Roberts regarding plugs and English rights negotiation for chassis 79-TW.17th Nov 1921Box 33 \ 3  Scan192
Pamphlet on sparking plugs from Barracloughs (Engineers) Ltd.23th Nov 1921Box 33 \ 3  Scan193
Product page for the 'Patent Model M.W' and 'Bradford Patent Plug', showing the complete assembly and its individual parts.23th Nov 1921Box 33 \ 3  Scan194
Guarantee and information leaflet for 'The Bradford' patent plugs.26th Nov 1921Box 33 \ 3  Scan195
Letter regarding a delay in testing Prima Sparking Plugs.26th Nov 1921Box 33 \ 3  Scan196
Technical evaluation and test report on the 'PRIMA' sparking plug.26th Nov 1921Box 33 \ 3  Scan197
Test report conclusion on Prima spark plugs, finding them inferior and not recommended for use.28th Nov 1921Box 33 \ 3  Scan198
Letter of acknowledgement for a report regarding unsatisfactory Prima plugs.28th Nov 1921Box 33 \ 3  Scan199
Extract from a report detailing a visit to West Wittering regarding spark plug testing for the Goshawk engine.30th Dec 1921Box 33 \ 3  Scan200
Requesting attendance at a conference to agree on a policy for ordering sparking plugs.27th Jan 1922Box 33 \ 3  Scan201
Letter from C. G. Mason offering a trial set of a French device, 'L'Eclateur Cure', for testing on Aero and car engines.3rd Feb 1922Box 33 \ 3  Scan202
Product information and fitting instructions for the 'L'Eclateur Cure' spark plug device.23th Feb 1922Box 33 \ 3  Scan203
Letter from C. Meier-Mattes & Co offering Deltavis Sparking Plugs for testing.23th Feb 1922Box 33 \ 3  Scan204
Letter from C. Meier-Mattes & Co regarding Deltavis sparking plugs and other precision parts.7th Mar 1922Box 33 \ 3  Scan205
Sales letter from Pickard, Dobson & Co Ltd offering a trial set of their 'Platomac' Sparking Plugs.23th Mar 1922Box 33 \ 3  Scan206
Instructional leaflet and advertisement for Platomaс spark plugs, detailing gap settings and showing a parts diagram.23th Mar 1922Box 33 \ 3  Scan207
Directions for adjusting the gap on a spark plug using a spanner with a built-in feeler gauge.23th Mar 1922Box 33 \ 3  Scan208
Advertisement for the Platomac detachable and adjustable sparking plug.27th Apr 1921Box 33 \ 3  Scan209
Review of various automotive accessories including a non-fouling spark plug, a spring gaiter, and one-man hood fittings.27th Apr 1921Box 33 \ 3  Scan210
Request to arrange testing for eight Type D3 Mica Plugs sent in by the Igna Engineering Co. Ltd.25th Apr 1922Box 33 \ 3  Scan211
Letter from Deltavis Co's agent following up on six type Z2 sparking plugs sent for testing.27th Apr 1922Box 33 \ 3  Scan212
Internal request to purchase a Westinghouse Neon Gas Spark Plug Tester for the Experimental Department.23th Jun 1922Box 33 \ 3  Scan213
Instructions and report on the testing of Del'tavis 215 type plugs.4th Jul 1922Box 33 \ 3  Scan214
Forwarding a letter and a Sparking Plug Remover from the Runbaken Magneto Co. Ltd.19th Jul 1922Box 33 \ 3  Scan215
Sales letter from The Runbaken Magneto Co Ltd. proposing an accessory for vehicles.13th Jul 1922Box 33 \ 3  Scan216
Promotional leaflet for Swiss-made Deltavis spark plugs, valves, whistles, and precision screw parts.13th Jul 1922Box 33 \ 3  Scan217
Advertisement leaflet for turned precision parts and high-class screwed ware, detailing types, prices, and quality benefits.7th Sep 1922Box 33 \ 3  Scan218
Testing of K.L.G. sparking plugs and the decision to temporarily use Lodge plugs due to potential overoiling issues.7th Sep 1922Box 33 \ 3  Scan219
Performance and selection of ignition plugs for the 40/50 and Goshawk models.26th Sep 1922Box 33 \ 3  Scan220
Suitability and performance of different spark plugs (K.L.G. and Lodge C.9) for the 40/50 car.26th Sep 1922Box 33 \ 3  Scan221
Sending 'M' and 'D' type Metric Plugs from the Forward Sparking Plug Co. for testing.29th Sep 1922Box 33 \ 3  Scan222
Letter from A. Picard offering a free set of JAM spark plugs for testing.5th Oct 1922Box 33 \ 3  Scan223
Translated testimonial letter regarding the satisfactory performance of J.A.M. plugs.9th Nov 1921Box 33 \ 3  Scan224
Testimonial letter from driver Rougier regarding the performance of JAM spark plugs.6th Jun 1922Box 33 \ 3  Scan225
Translated testimonial from a customer regarding the performance of plugs after winning a race.7th Jun 1922Box 33 \ 3  Scan226
Translated testimonial letter regarding the performance of spark plugs during a Grand Prix event.24th Jul 1922Box 33 \ 3  Scan227
Translated testimonial from Etablissements Bablot regarding satisfaction with plugs used in the Boulogne races.5th Aug 1922Box 33 \ 3  Scan228
Translated testimonial regarding the standard adoption of J.A.M. plugs Nos 1 and 2 for Hispano Suiza engines.29th Dec 1921Box 33 \ 3  Scan229
From GWH to Mr. Hives detailing the results of testing M type and D type forward sparking plugs.12th Oct 1922Box 33 \ 3  Scan230
Test report on Block Sparking Plugs type 12/20, noting pre-ignition issues and power loss.23th Nov 1922Box 33 \ 3  Scan231
Promotional letter from W. Courte Elektro-Industrie regarding their 'Wico-Eko' three-pole spark plug.6th Dec 1922Box 33 \ 3  Scan232
Sales proposal for 'Wico-Mko' Spark-Plugs and a 'Wico' Spark-Plug-Contact.6th Dec 1922Box 33 \ 3  Scan233
Advertisement leaflet for an EKO spark plug with 3 electrodes.6th Dec 1922Box 33 \ 3  Scan234
Multilingual promotional leaflet for the 'Wico' electrical immersion heater.6th Nov 1922Box 33 \ 3  Scan235
Letter from Dowden & Company regarding a client's positive feedback on a Petrol Indicator and 'Block' plugs, which are being sent for testing.6th Nov 1922Box 33 \ 3  Scan236
Follow-up letter from Dowden & Company regarding Petrol Indicator and 'Block' plugs sent for testing.20th Dec 1922Box 33 \ 3  Scan237
Burnt valves, pre-ignition causes related to spark plugs, and engine performance observations.29th Dec 1922Box 33 \ 3  Scan238
The practice of pinning piston rings and its effect on gas-tightness, referencing the 40/50 and Hawk engines.6th Jan 1923Box 33 \ 3  Scan239
Letter to Messrs. Dowden & Co. rejecting their Block sparking plugs and petrol level indicator after testing.6th Jan 1923Box 33 \ 3  Scan240
Despatch of a Petrol Level Indicator and sparking plugs to Messrs. Dowden for testing and examination.6th Jan 1923Box 33 \ 3  Scan241
Letter from Dowden & Co. regarding the receipt of a parcel containing a petrol indicator and sparking plugs.10th Jan 1923Box 33 \ 3  Scan242
Ignition plug and switching arrangements for the 40/50 & Goshawk models.1st Jan 1923Box 33 \ 3  Scan243
Forwarding particulars for Block plugs and Level Indicators supplied by Messrs. Dowden of London.18th Jan 1923Box 33 \ 3  Scan244
Standardisation of the C.56 Lodge ignition plug for 40/50 & Goshawk models, based on a conversation with Mr. Royce.23th Jan 1923Box 33 \ 3  Scan245
Request for a suitable cheap spark plug for engine gear quietening tests due to over-oiling issues.16th Jul 1924Box 33 \ 3  Scan246
Two special sparking plugs received from Paris for examination and expressing doubts about their utility.16th Jul 1924Box 33 \ 3  Scan247
Trouble with sparking plugs on the engine gear quietening stand due to over-oiling, requesting a cheap alternative.16th Jul 1924Box 33 \ 3  Scan248
Letter regarding a set of eight Deltavis Z.II sparking plugs sent for testing and evaluation.28th Aug 1924Box 33 \ 3  Scan249
Query regarding issues with K.L.G. and Lodge sparking plugs during engine testing and a request for a recommendation for a cheap porcelain alternative.13th Nov 1924Box 33 \ 3  Scan250
Recommendation to obtain Champion Sparking Plugs for 20 HP & 40/50 HP chassis testing due to their resistance to sooting.19th Nov 1924Box 33 \ 3  Scan251
Special short sparking plugs for testing that are no longer required by R.A.F. Stores.28th May 1937Box 33 \ 3  Scan252
Letter forwarding an enquiry about special sparking plugs to the Derby Works for consideration.22th Jul 1927Box 33 \ 3  Scan253


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