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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Graph comparing power curves at 4,000' for a moderate supercharger engine using standard versus long duration camshafts.20th Dec 1928Box 43 \ 3  Scan225
Filing cover sheet with handwritten reference numbers and a date stamp.3rd Jan 1929Box 43 \ 3  Scan226
Fitting original long duration camshafts to 'F' Type Engine No. 113.14th Feb 1929Box 43 \ 3  Scan227
Tests conducted on nitro-alloy crankshafts and camshafts in a development engine.2nd Nov 1929Box 43 \ 3  Scan228
Extract regarding the magneto selection for the Falcon X engine, considering Thomson-Houston and Watford Co. options.21th Dec 1925Box 43 \ 4  Scan001
Update on the construction progress of the Watford 12-cylinder single spark magneto for aero engines.9th Jun 1926Box 43 \ 4  Scan002
Test report on two Watford type IS12 aero magnetos for a Falcon X experimental engine, detailing a failure and subsequent repair.23th Sep 1926Box 43 \ 4  Scan003
Instruction sheet detailing the results of high and low-speed magneto sparking tests.29th Aug 1920Box 43 \ 4  Scan004
Attached report on Watford Aero Magnetos Type IS.12 for the Falcon X engine.23th Sep 1926Box 43 \ 4  Scan005
Test report on two Watford Type IS.12 Aero Magnetos for a Falcon X experimental engine.23th Sep 1926Box 43 \ 4  Scan006
Failure of distributor mouldings and wiring issues on Watford magnetos.8th Nov 1926Box 43 \ 4  Scan007
Summary of the troubles experienced with Watford magnetos, covering wiring, distributors, and other failures.9th Nov 1926Box 43 \ 4  Scan008
Issues with magneto components, including incorrectly drilled holes and problems caused by rushed production.10th Nov 1926Box 43 \ 4  Scan009
Faulty contact breaker component from a Falcon X magneto, detailing issues with the points and mechanism.10th Nov 1926Box 43 \ 4  Scan010
List of ten points for possible improvement on the Watford Type IS Aero Magnetos.10th Nov 1926Box 43 \ 4  Scan011
Noted issues and suggestions following an examination of a Watford IS.12 magneto for the Falcon X engine.10th Nov 1926Box 43 \ 4  Scan012
The return of a repaired contact breaker from North & Sons Ltd.12th Nov 1926Box 43 \ 4  Scan013
The return and identified faults of Watford magnetos for a Falcon X engine.16th Nov 1926Box 43 \ 4  Scan014
Issues with Watford Magnetos for the Falcon X, detailing correspondence with the supplier North & Sons regarding missing and incorrect parts.25th Nov 1926Box 43 \ 4  Scan015
Oil fouling issues with Aero Type Watford IS.12 Magnetos.30th Nov 1926Box 43 \ 4  Scan016
Sparking faults and magnetic leakage in two magnetos returned to Messrs. Norths for investigation.30th Nov 1926Box 43 \ 4  Scan017
The testing and fault diagnosis of Watford Aero Magnetos type IS.12, numbers 83134/5.24th Nov 1926Box 43 \ 4  Scan018
Extract regarding the fitting of magnetos from either Thomson-Houston or Watford.6th Nov 1926Box 43 \ 4  Scan019
Reported trouble with Watford magnetos and the need to increase stock to twelve units.8th Nov 1926Box 43 \ 4  Scan020
Investigation into a failed Watford aero magneto from a Falcon X engine.17th Nov 1926Box 43 \ 4  Scan021
Instructions regarding an oil leak into a magneto causing bad contact, and the subsequent fix.29th Jun 1920Box 43 \ 4  Scan022
List of points for discussion with Messrs. North's regarding magneto and distributor issues.24th Nov 1926Box 43 \ 4  Scan023
Status and anticipated improvements for Watford Type IS.12 magnetos.3rd Dec 1926Box 43 \ 4  Scan024
Clarifying the ownership of several pairs of Watford Type IS.12 Aero Magnetos.7th Dec 1926Box 43 \ 4  Scan025
Instruction sheet detailing the measurement of the safety gap on a Watford aero magneto type IS12, which was found to be too small.9th Dec 1926Box 43 \ 4  Scan026
Instruction regarding the safety gap on the B.T.H SC12-7 magneto for Watford machines.29th Jun 1920Box 43 \ 4  Scan027
Safety gaps of Watford Aero Magnetos Type IS.12, noting they are too small and comparing them to B.T.H. magnetos.10th Dec 1926Box 43 \ 4  Scan028
Specification of inspection and test for a Watford type IS.12 aero magneto for the Falcon X engine.10th Dec 1926Box 43 \ 4  Scan029
Testing procedures for a magneto, detailing various RPM runs, force limits, and spark gap settings.13th Dec 1926Box 43 \ 4  Scan030
Comparison of B.T.H. and Watford magnetos for the Falcon X aero engine, discussing performance tests and oil-related faults.13th Dec 1926Box 43 \ 4  Scan031
Watford magneto issues, including oil leaks into the contact breaker and distributor failures.18th Dec 1926Box 43 \ 4  Scan032
Critique and suggested modifications for a Watford magneto type IS.12.13th Dec 1926Box 43 \ 4  Scan033
Comparative electrical performance tests of B.T.H. and Watford magnetos for the Falcon X aero engine.13th Dec 1926Box 43 \ 4  Scan034
General specification of performance for a 12-cylinder, four spark per revolution magneto for the Falcon X aero engine.13th Dec 1926Box 43 \ 4  Scan035
Page 2 of a magneto utility test procedure, detailing spark gap testing under various conditions.13th Dec 1926Box 43 \ 4  Scan036
Specifications for magneto timing, sparking speed, and contact breaker lever operation.14th Dec 1926Box 43 \ 4  Scan037
Broken Watford Aero Magneto distributor, an attached report, and a request for a replacement.14th Dec 1926Box 43 \ 4  Scan038
Magneto distributor failure due to a spark jumping to earth, with a recommendation to increase the distance to prevent tracking.13th Dec 1926Box 43 \ 4  Scan039
Correspondence regarding a replacement distributor block for a Watford Aero Magneto and plans for a new rubber-based design.22th Dec 1926Box 43 \ 4  Scan040
Confirmation from North & Sons Ltd. to increase the safety gap length in Watford Aero Magnetos Type I.S.12.29th Dec 1926Box 43 \ 4  Scan041
Request for a sectional blueprint of the Watford IS.12 aero magneto.29th Dec 1926Box 43 \ 4  Scan042
Watford IS.12 Aero Magnetos, attaching assistant's reports WB.122 and WB.124.7th Jan 1927Box 43 \ 4  Scan043
Investigation into the oiling procedures and effects on the Watford IS.12 magnetos.6th Jan 1927Box 43 \ 4  Scan044
The correct lubrication levels for magnetos to avoid affecting the platinum points.7th Jan 1927Box 43 \ 4  Scan045
Critique of the low tension earthing connection method on Watford IS.12 magnetos.7th Jan 1927Box 43 \ 4  Scan046
Following up on an outstanding request for blueprints of a Watford I.S.12 type Aero Magneto.10th Jan 1927Box 43 \ 4  Scan047
Letter regarding Watford I.S.12 type Aero Magnetos, attaching correspondence from North & Sons Ltd.13th Mar 1927Box 43 \ 4  Scan048
Letter from North & Sons Ltd. discussing reports on oiling and the preparation of low tension wire.12th Jan 1927Box 43 \ 4  Scan049
Instructions detailing modifications to Watford IS12 magnetos for the Falcon X engine.25th Jan 1927Box 43 \ 4  Scan050
Comparison of a distributor design against the B.T.H model, noting its superior features but questioning an addition.8th Dec 1924Box 43 \ 4  Scan051
Instructions regarding magnetos, covering ventilation windows, weight, distributor nuts, and safety gaps.8th Dec 1924Box 43 \ 4  Scan052
Test report on two production magnetos, detailing pass/fail results for low-speed sparking.8th Dec 1924Box 43 \ 4  Scan053
Return of obsolete distributors and screens for Watford IS.12 Aero Magnetos.26th Jan 1927Box 43 \ 4  Scan054
Alterations and performance issues with Watford IS.12 magnetos for the Falcon X engine.31th Jan 1927Box 43 \ 4  Scan055
Modified Watford IS.12 magnetos for the Falcon X engine.25th Jan 1927Box 43 \ 4  Scan056
The effect of increasing the primary gap on the high-speed performance of Watford and B.T.H. aero magnetos.27th Jan 1927Box 43 \ 4  Scan057
The Air Ministry's decision not to proceed with the modification of Watford magnetos.8th Feb 1927Box 43 \ 4  Scan058
Replacement magneto for Eagle XVI engines after one failed a two-hour test.8th Feb 1927Box 43 \ 4  Scan059
Distributor timing specifications for a Watford IS12 Magneto No. 83133.9th Feb 1927Box 43 \ 4  Scan060
Calculations for piston position and spark timing relative to a hand magneto.9th Feb 1927Box 43 \ 4  Scan061
Contact breaker timing data for a Watford IS.12 Magneto, No. 83133.9th Feb 1927Box 43 \ 4  Scan062
Instructions regarding production testing and sparking issues with Watford IS12 magnetos.12th Feb 1927Box 43 \ 4  Scan063
Instruction note regarding the poor performance of magnetos under certain engine conditions.8th Dec 1924Box 43 \ 4  Scan064
Reply from North & Sons Ltd. regarding feedback on Watford I.S.12 Magnetos for the Falcon X engine.14th Feb 1927Box 43 \ 4  Scan065
The unsatisfactory bench test performance of Watford IS.12 magnetos, highlighting issues with sparking and timing.21th Feb 1927Box 43 \ 4  Scan066
Modifications to Watford type IS.12 magnetos and seeking A.I.D. confirmation for upgrades.24th Feb 1927Box 43 \ 4  Scan067
The investigation and comparative testing of a faulty Watford Aero Magneto from a Falcon engine.25th Feb 1927Box 43 \ 4  Scan068
Technical report discussing the performance and testing of a magneto contact breaker.25th Feb 1927Box 43 \ 4  Scan069
Correspondence regarding the performance of two Watford IS.12 magnetos and a reply from supplier North & Sons.1st Mar 1927Box 43 \ 4  Scan070
Inability to return certain magnetos and the arrangement of a meeting to discuss their use on the Falcon X engine.1st Mar 1927Box 43 \ 4  Scan071
Dispute over which magneto to use for an F.10 engine test and arranging a conference to resolve the matter.3rd Mar 1927Box 43 \ 4  Scan072
Requesting the location and delivery of specific Watford IS.12 magnetos.22th May 1921Box 43 \ 4  Scan073
Status of several Watford Aero Magnetos and inquiring about their return for correction.29th Mar 1927Box 43 \ 4  Scan074
Status and authorization of work on Watford Aero Magnetos.30th Mar 1927Box 43 \ 4  Scan075
Letter to Messrs. North & Sons regarding the unsatisfactory situation with Watford Aero Magnetos type IS.12.1st Apr 1927Box 43 \ 4  Scan076
Letter from North & Sons, Ltd. concerning modifications to Watford Aero Magnetos.5th Apr 1927Box 43 \ 4  Scan077
Letter to North & Sons regarding photostat copies of Make-Ratio Speed Curves for Aero Magneto Contact breakers.7th May 1927Box 43 \ 4  Scan078
Letter to the Air Ministry requesting permission to return faulty Watford magnetos to the makers for modification.9th May 1927Box 43 \ 4  Scan079
Production inspection and test results for the Watford Type IS.12 Magneto.11th Feb 1927Box 43 \ 4  Scan080
Visit by Mr. North concerning issues and alternative suppliers for aero engine magnetos.19th Aug 1927Box 43 \ 4  Scan081
Letter to North & Sons regarding issues with Watford I.S.12 Aero Magnetos, including a note from Mr. Royce.22th Aug 1927Box 43 \ 4  Scan082
Letter to Messrs. North & Sons regarding the return of out-of-date magnetos and requirements for new ones.25th Aug 1927Box 43 \ 4  Scan083
Performance report on four Watford Aero Magnetos, type IS.12, detailing issues and run times.25th Aug 1927Box 43 \ 4  Scan084
Arrangements for the modification of Watford Magnetos Type I.S.12.29th Aug 1927Box 43 \ 4  Scan085
Letter from North & Sons Ltd regarding the use of their Watford Magnetos in the Schneider Trophy race.28th Sep 1927Box 43 \ 4  Scan086
Test results for Aero Magneto Rotor M.I., comparing Watford and B.T.H. components.30th Sep 1927Box 43 \ 4  Scan087
From EFC to Roy regarding the overdue return of Watford magnetos from Messrs. Norths.6th Oct 1927Box 43 \ 4  Scan088
Use of a Watford magneto drive over a solid drive, citing lower risk and successful use in Napier engines for the Schneider Trophy Race.1st Nov 1927Box 43 \ 4  Scan089
Letter to North & Sons Ltd. regarding an upcoming engine type test for 12-cylinder aero magnetos.4th Nov 1927Box 43 \ 4  Scan090
Letter from North & Sons Ltd regarding the completion timeline for 12 cylinder aero magnetos for an engine type test.10th Nov 1927Box 43 \ 4  Scan091
Letter to Messrs. North & Sons, Ltd. regarding the scheduling of a Type Test.12th Nov 1927Box 43 \ 4  Scan092
Letter from North & Sons, Ltd. regarding a delay in submitting approved magnetos for a Type Test.17th Nov 1927Box 43 \ 4  Scan093
Letter to Messrs. North & Sons Ltd. regarding a revised specification for a 12-cylinder aero magneto for the Falcon aero engine.22th Nov 1927Box 43 \ 4  Scan094
Letter to Messrs. North & Sons Ltd. regarding a revised specification for 12-cylinder magnetos for Falcon aero engines.26th Nov 1927Box 43 \ 4  Scan095
Letter from North & Sons, Ltd. discussing the specifications and potential modification of 12 cylinder magnetos.29th Nov 1927Box 43 \ 4  Scan096


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