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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Letter from North & Sons, Ltd. confirming the supply details for Watford Type IS.12 Aero Magnetos.9th Dec 1929Box 43 \ 4  Scan197
Standardisation of Watford 12-cylinder aero magnetos type IS.12 for 'F' engines.7th Nov 1929Box 43 \ 4  Scan198
Letter to Messrs. North & Sons, Ltd. outlining suggestions for magneto investigation and development.17th Dec 1929Box 43 \ 4  Scan199
Letter to Messrs. North & Sons, Ltd. regarding the results of EW6A magnetos using contact breakers with tungsten points.17th Dec 1929Box 43 \ 4  Scan200
Letter to North & Sons Ltd. regarding the ownership and return of four magnetos sold to the Air Ministry.17th Dec 1929Box 43 \ 4  Scan201
Meeting to discuss modified Chassis Magnetos and the return of 12-cylinder Aero Magnetos for testing.3rd Jan 1930Box 43 \ 4  Scan202
Modifications made to a pair of magnetos for the forthcoming 'F' engine type test.1st Mar 1930Box 43 \ 4  Scan203
Letter to Messrs. North & Sons, Ltd. confirming points regarding various Watford Aero Magnetos.10th Jan 1930Box 43 \ 4  Scan204
Letter to Messrs. North & Sons, Ltd. detailing the differences between magneto types SP.12-5 and SP.12-2.10th Jan 1930Box 43 \ 4  Scan205
Letter to North & Sons Ltd. regarding necessary alterations to F.14 type engine magnetos before a type test.10th Jan 1930Box 43 \ 4  Scan206
Letter from North & Sons Ltd regarding the modification of Watford Aero Magnetos.14th Jan 1930Box 43 \ 4  Scan207
Letter from North & Sons Ltd. regarding the materials used for specific Watford Aero Magnetos.14th Jan 1930Box 43 \ 4  Scan208
Watford Aero Magnetos, including the return of two units for modification and comments on the use of magnesium versus aluminium alloy for parts.16th Jan 1930Box 43 \ 4  Scan209
Instructions to despatch a pair of Watford Aero Magnetos for a contact breaker base plate change.16th Jan 1930Box 43 \ 4  Scan210
Letter to Messrs. North & Sons regarding the change of magneto parts from magnesium to aluminium alloy for Sir Henry Segrave's 'Miss England' engine.17th Jan 1930Box 43 \ 4  Scan211
Instruction to despatch two Watford SP.12-5 magnetos to Messrs. North and change parts from magnesium to aluminium alloy.7th Jan 1930Box 43 \ 4  Scan212
Letter to Messrs. North & Sons, Ltd. chasing the return of two modified magnetos for an aero engine.28th Jan 1930Box 43 \ 4  Scan213
Letter to Messrs. North & Sons, Ltd. requesting clarification on the correct type designations for aero magnetos.31th Jan 1930Box 43 \ 4  Scan214
Letter to North & Sons Ltd. regarding a modification needed for Watford Aero Magnetos due to an issue with the distributor range.1st Feb 1930Box 43 \ 4  Scan215
Letter from North & Sons clarifying the type numbering system for 12-cylinder aircraft magnetos.3rd Feb 1930Box 43 \ 4  Scan216
Letter from North & Sons Ltd. enclosing a catalogue of Aircraft Magnetos.3rd Feb 1930Box 43 \ 4  Scan217
The preliminary bench testing of Watford IS12 aero magnetos.3rd Feb 1930Box 43 \ 4  Scan218
Performance comparison and potential modification of various engine magnetos.1st Feb 1930Box 43 \ 4  Scan219
Requesting special observation of a specific magneto during a 100-hour engine test due to unequal performance.1st Feb 1930Box 43 \ 4  Scan220
Acceptance test log for Watford Aero Magnetos to an abridged specification.6th Feb 1930Box 43 \ 4  Scan221
Request for test results on Watford & B.T.H. aero magnetos conducted at Farnborough.6th Feb 1930Box 43 \ 4  Scan222
Status and testing of Watford IS.12 aero magnetos.7th Feb 1930Box 43 \ 4  Scan223
The despatch of a faulty magneto and ordering modified contact breaker covers.3rd Feb 1930Box 43 \ 4  Scan224
Letter from North & Sons regarding an investigation into rotor electrode positions in relation to distributor segments for a Magneto.8th Feb 1930Box 43 \ 4  Scan225
Letter to Messrs. North & Sons, Ltd. regarding the underperformance of an IS.12 magneto and its urgent return for improvement.13th Feb 1930Box 43 \ 4  Scan226
A.I.D. objection regarding Watford magnetos for an F. Type Test.3rd Feb 1930Box 43 \ 4  Scan227
Letter to a supplier regarding an issue with modified aero magneto contact breaker cover clips.13th Feb 1930Box 43 \ 4  Scan228
Letter to Messrs. North & Sons.Ltd concerning the incorrect safety gap length on IS.12 type aero magnetos.14th Feb 1930Box 43 \ 4  Scan229
Letter to Messrs. North & Sons, Ltd. regarding modifications and test results for various machines and magnetos.14th Feb 1930Box 43 \ 4  Scan230
Letter to Messrs. North & Sons, Ltd. requesting a box or tubular type spanner for B.T.H. magnetos.15th Feb 1930Box 43 \ 4  Scan231
Letter to Messrs. North & Sons, Ltd. requesting blueprints for Aero Magnetos Type SP.12-2.17th Feb 1930Box 43 \ 4  Scan232
Letter to Messrs. North & Sons Ltd. regarding issues and suggestions for Watford Aero Magnetos.19th Feb 1930Box 43 \ 4  Scan233
Report investigating magneto safety gap sparking issues, comparing Watford and B.T.H. models.19th Feb 1930Box 43 \ 4  Scan234
Letter to Messrs. North & Sons, Ltd. concerning magneto rotor dimensions and performance issues.19th Feb 1930Box 43 \ 4  Scan235
Letter from North & Sons, Ltd. acknowledging a previous letter and enclosing two up-to-date copies of print No. N. 2200.20th Feb 1930Box 43 \ 4  Scan236
Letter to Messrs. North & Sons, Ltd. regarding out-of-date prints for a magneto scheme.21th Feb 1930Box 43 \ 4  Scan237
Graph of short and open circuit ampere/volt-speed curves for the primary windings of Watford and B.T.H. aero magnetos.25th Apr 1930Box 43 \ 4  Scan238
Blank document page with a purple ink stamp from the print room.25th Apr 1930Box 43 \ 4  Scan239
Comparison of B.T.H. aero magneto distributor dimensions with a suggestion for increasing overlap.14th Feb 1930Box 43 \ 4  Scan240
Blueprint showing the setting of an electrode on a 12-cylinder magneto.7th Feb 1930Box 43 \ 4  Scan241
Experimental bench test schedule detailing the design and performance of a Watford (aero) magneto.18th Feb 1930Box 43 \ 4  Scan242
Specification sheet for contact breaker point gap, timing, and automatic advance characteristics.18th Feb 1930Box 43 \ 4  Scan243
Table of dimensions for a jump spark distributor.18th Feb 1930Box 43 \ 4  Scan244
Electrical performance test results for endurance, short circuit, open circuit, and volt-speed curve.18th Feb 1930Box 43 \ 4  Scan245
Test results for a closed-circuit primary ampere-speed curve and various sparking characteristics.18th Feb 1930Box 43 \ 4  Scan246
Specification sheet detailing secondary milliamps, contact breaker point gaps, and timing data.18th Feb 1930Box 43 \ 4  Scan247
Remarks on silence of operation and tangential force measurements.21th Feb 1930Box 43 \ 4  Scan248
How to obtain Air Ministry test reports on Watford and B.T.H. aero magnetos.21th Feb 1930Box 43 \ 4  Scan249
Letter requesting the results of Farnborough tests on Watford and B.T.H. Aero Magnetos.25th Feb 1930Box 43 \ 4  Scan250
Letter from North & Sons, Ltd. acknowledging a letter and enclosing two copies of drawing N. 2200.25th Feb 1930Box 43 \ 4  Scan251
Progress report on the F.XIV.MS.39 engine type test after the second 10-hour run.26th Feb 1930Box 43 \ 4  Scan252
The satisfactory performance of a new Case gas starter, noting a pressure reading and ongoing leaks.26th Feb 1930Box 43 \ 4  Scan253
Modification and testing of Watford IS.12 magnetos, comparing them to B.T.H. magnetos.26th Feb 1930Box 43 \ 4  Scan254
Comparative bench test report on Watford and B.T.H. aero magnetos, with a performance summary table.26th Feb 1930Box 43 \ 4  Scan255
Continued page detailing suggested modifications to Watford and B.T.H. magnetos.27th Feb 1930Box 43 \ 4  Scan256
Letter of thanks to Messrs. North & Sons, Ltd. for two copies of Drawing No. N.2200.27th Feb 1930Box 43 \ 4  Scan257
Progress report on the F.XIV.MS.39 engine type test, detailing the third 10-hour run, consumption data, and performance issues.27th Feb 1930Box 43 \ 4  Scan258
Engine inspection, ignition plug replacement, and planning for endurance and special tests.27th Feb 1930Box 43 \ 4  Scan259
Progress report on the F. Engine Type Test No.F. XIV.MS.39, detailing a 10-hour hangar test.3rd Mar 1930Box 43 \ 4  Scan260
Noting an engine has been moved to a test bed to complete 30 hours of running.1st Mar 1930Box 43 \ 4  Scan261
Progress report for the F.Engine Type Test on engine number F.XIV.MS.39.3rd Mar 1930Box 43 \ 4  Scan262
Disagreeing with the alteration of the 'H' engine safety gap from 7.7 to 8.5 m/m.4th Mar 1930Box 43 \ 4  Scan263
The recommended timing settings for BTH and Watford aero magnetos.7th Mar 1930Box 43 \ 4  Scan264
Requesting an inspection and strip report for Watford magnetos following a type test.25th Mar 1930Box 43 \ 4  Scan265
Letter to Messrs. North & Sons, Ltd. correcting an error in a previous communication about Watford magnetos.25th Apr 1930Box 43 \ 4  Scan266
Receipt and urgent testing of Watford magnetos for an engine.26th Mar 1930Box 43 \ 4  Scan267
Letter from North & Sons, Ltd. confirming the completion of a type test on magnetos for an aircraft engine.26th Mar 1930Box 43 \ 4  Scan268
Cover letter for an attached report on the condition and performance of Watford IS.12 magnetos following a type test.3rd Apr 1930Box 43 \ 4  Scan269
Letter to Messrs. North & Sons Ltd. enclosing a report on the trial of Watford type IS.12 magnetos and asking for comments on the inferiority of one machine.3rd Apr 1930Box 43 \ 4  Scan270
Suggestion to change the finish on B.T.H. and Watford aero magnetos to a dull aluminium.3rd Apr 1930Box 43 \ 4  Scan271
Examination report on two Watford IS12 magnetos after a 100-hour type test on an F39 engine.3rd Apr 1930Box 43 \ 4  Scan272
Test results for two magnetos, identifying a fault in magneto No. 98034.7th Apr 1930Box 43 \ 4  Scan273
Letter from North & Sons, Ltd. regarding the results of type testing on magnetos, one of which showed irregular sparking.7th Apr 1930Box 43 \ 4  Scan274
Correspondence regarding irregular sparking in Watford IS.12 Magneto No. 98034 and arranging for its full examination.8th Apr 1930Box 43 \ 4  Scan275
Sending a failed high tension rotor and bakelite fan from a Watford IS.12 magneto back to the supplier for replacement parts.9th Apr 1930Box 43 \ 4  Scan276
Return of a Watford Magneto for examination and related subsidiary testing.9th Apr 1930Box 43 \ 4  Scan277
Letter to Messrs. North & Sons, Ltd. regarding a spanner for Watford magnetos and correcting an error in a previous letter.25th Apr 1930Box 43 \ 4  Scan278
Letter from North & Sons, Ltd. regarding the despatch of a spanner.28th Apr 1930Box 43 \ 4  Scan279
The position of the 'F' type test engine No.39 for the return of a magneto.5th May 1930Box 43 \ 4  Scan280
Return of a Watford I.S.12 Magneto after completion of engine running tests.10th May 1930Box 43 \ 4  Scan281
The insulation testing of Watford Aero Magnetos and safety gap settings.14th May 1930Box 43 \ 4  Scan282
Ordering error for spanners for Sir Henry Segrave's 'R' engine and a query on the excessive price charged.6th May 1930Box 43 \ 4  Scan283
The despatch of two Watford Aero Magnetos, type IS.12.17th May 1930Box 43 \ 4  Scan284
Letter to Messrs. North & Sons, Ltd. regarding the testing and performance of Watford IS.12 magnetos.17th May 1930Box 43 \ 4  Scan285
Letter to a supplier regarding testing and safety gap requirements for aero magnetos.17th May 1930Box 43 \ 4  Scan286
Letter from North & Sons, Ltd. acknowledging a letter and promising a full reply concerning Watford I.S.12 Magnetos.21th May 1930Box 43 \ 4  Scan287
Cost comparison and production query regarding Watford and B.T.H. magnetos for 'F' type engines.21th May 1930Box 43 \ 4  Scan288
Request to obtain three spring lubricator pads for Watford IS.12 & SP.12-2 magnetos.3rd Jun 1930Box 43 \ 4  Scan289
Letter to North & Sons, Ltd. regarding Watford IS.12 magnetos, a technical report, and safety gap settings.19th Jun 1930Box 43 \ 4  Scan290
Letter from North & Sons, Ltd. regarding a technical report on magnetos and future delivery requirements.28th Jun 1930Box 43 \ 4  Scan291
Letter to Messrs. North & Sons, Ltd. requesting the return of magneto No.98034 for an aero engine.3rd Jul 1930Box 43 \ 4  Scan292
Letter from North & Sons, Ltd. regarding the improved performance and further testing of Magneto No. 98034 for Rolls-Royce.14th Jul 1930Box 43 \ 4  Scan293
Letter from North & Sons Ltd. regarding the despatch of a 12 cylinder Magneto.16th Jul 1930Box 43 \ 4  Scan294
Letter to Messrs. North & Sons Ltd. regarding the despatch and receipt of a magneto and arranging a call.18th Jul 1930Box 43 \ 4  Scan295
The performance of a modified Watford IS12 magneto after bench testing.18th Jul 1930Box 43 \ 4  Scan296


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