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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The features and testing plans for the 4.EX experimental chassis.27th Feb 1920Box 41 \ 1  Scan081
Extract listing experimental parts fitted to 40/50 chassis models.15th Apr 1920Box 41 \ 1  Scan082
Valve mechanism noises at higher engine speeds, attributed to valve spring vibration.1st Jan 1921Box 41 \ 1  Scan083
Recommendation to replace faulty rectangular inlet valve springs with improved round wire springs on 20 HP Tourist Trophy cars.25th Jan 1922Box 41 \ 1  Scan084
The comparative endurance testing of valve springs, including a proposed American design.23th Aug 1923Box 41 \ 1  Scan085
Instruction to alter the steering lever to the other side on the front axle for the American model.27th Sep 1919Box 41 \ 1  Scan086
Decisions on the production and supply of chassis for the American market.31th Oct 1919Box 41 \ 1  Scan087
Report from a conference discussing proposed alterations for American market cars.2nd Dec 1919Box 41 \ 1  Scan088
Points for attention following an American visit regarding vehicle components.11th Nov 1920Box 41 \ 1  Scan089
Letter from Rolls Royce of America Inc. chasing prints for the re-lubrication of the Axle Control Sphere.4th Aug 1921Box 41 \ 1  Scan090
Proposal memo regarding an alteration to Akermite Pivot Thrust Washers.28th Aug 1923Box 41 \ 1  Scan091
Letter discussing the wear and lubrication of pivot pin bushes and a proposed solution for oil spillage.28th Jul 1923Box 41 \ 1  Scan092
Letter discussing the performance of an Ackeraite Pivot Thrust Washer after 7500 miles of use, comparing it to Genelite.15th Aug 1923Box 41 \ 1  Scan093
Letter from the American branch to Derby discussing front axle faults, specifically swerving under braking and 'tramping'.8th Dec 1926Box 41 \ 1  Scan094
Axle frequency, shock absorber performance, and front brake squeaking issues.8th Dec 1926Box 41 \ 1  Scan095
Braking tests and steering behavior with a new front axle.21th Dec 1926Box 41 \ 1  Scan096
Technical response discussing solutions for wheel wobble, tramping, and shimmy issues.21th Dec 1926Box 41 \ 1  Scan097
Remedies for steering wobble, brake squeaks, and other axle-related issues.21th Dec 1926Box 41 \ 1  Scan098
Letter from the American to the British office regarding front axle standardization and testing.5th May 1927Box 41 \ 1  Scan099
Page 2 of a letter concerning the fitting of aluminium guards to prevent ice banking around levers.5th May 1927Box 41 \ 1  Scan100
Comparing brake servo multiplication and braking effort percentages between Phantom models.15th Feb 1927Box 41 \ 1  Scan101
Changes to front and rear braking proportions and test results.15th Feb 1927Box 41 \ 1  Scan102
Cover note forwarding a copy of a letter from Mr. Olley regarding RRAI Brakes for comment.17th May 1929Box 41 \ 1  Scan103
Letter suggesting modifications to the servo cam-levers to resolve issues with the brake servo system.6th May 1929Box 41 \ 1  Scan104
Report discussing modifications to servo multiplication and brake linings to reduce squeaking.20th Oct 1929Box 41 \ 1  Scan105
Blueprint of a servo operating lever assembly and dog development.20th Oct 1929Box 41 \ 1  Scan106
Alteration report discussing brake troubles and potential improvements to the servo system.24th May 1929Box 41 \ 1  Scan107
Correspondence about brakes, enclosing a copy and photos for comment.17th Aug 1929Box 41 \ 1  Scan108
Letter discussing the design, testing, and manufacturing costs of brake ball thrust cam levers.3rd Jun 1929Box 41 \ 1  Scan109
Letter proposing the omission of a star spring and bushing to ensure even bedding of cam faces.3rd Jun 1929Box 41 \ 1  Scan110
Photograph displaying four lever arms with their associated ball bearing components.4th Jul 1929Box 41 \ 1  Scan111
Letter to Rolls-Royce of America regarding the front axle control anchorage and a proposed alteration.4th Jul 1929Box 41 \ 1  Scan112
Tests on ball thrust levers and potential modifications to R.R.A.I. brakes.18th Jul 1929Box 41 \ 1  Scan113
Two distinct sources of a clanking noise in the brake system upon release and proposing a solution.8th Aug 1929Box 41 \ 1  Scan114
Requesting an electrolytic vacuum valve for experimental work.9th Aug 1919Box 41 \ 2  Scan001
Letter discussing the sourcing and use of electrolytic vacuum valves for accumulator charging and wireless telegraphy.28th Aug 1919Box 41 \ 2  Scan002
Requesting to see new vacuum valve specimens from the US for potential use in car lighting dynamo systems.18th Sep 1919Box 41 \ 2  Scan003
The use of rectifier valves for wireless apparatus on trans-Atlantic flight machines and for battery charging.20th Sep 1919Box 41 \ 2  Scan004
Requesting samples of electrolytic vacuum valves for experimentation from the R.A.F.24th Sep 1919Box 41 \ 2  Scan005
Letter requesting Electrolytic Vacuum Valves for experimental use in controlling a chassis lighting dynamo.26th Sep 1919Box 41 \ 2  Scan006
Letter from the Ministry of Munitions of War regarding the sensitive construction of an Electrolytic Vacuum Valve.3rd Oct 1919Box 41 \ 2  Scan007
Price list and particulars for Thermionic Valves from the General Electric Co. Ltd.7th Oct 1919Box 41 \ 2  Scan008
Letter from Osram-Robertson Lamp Works regarding the supply of rectifying valves, with an internal note clarifying interest.9th Oct 1919Box 41 \ 2  Scan009
Quotation from Osram-Robertson Lamp Works for O.R.3 rectifying valves.20th Oct 1919Box 41 \ 2  Scan010
Request to obtain up-to-date catalogues for thermionic valves from three specified companies.21th Nov 1922Box 41 \ 2  Scan011
Quotation for B.T.H. wireless valves from The British Thomson-Houston Company Limited.24th Nov 1922Box 41 \ 2  Scan012
Enquiry to the Marconi Osram Valve Co. for a rectifying valve suitable for high voltages to measure ignition system impulses.30th Nov 1922Box 41 \ 2  Scan013
Continuation of a letter discussing the suitability of a valve for testing insulating materials.8th Dec 1922Box 41 \ 2  Scan014
Enquiries made to source a specific rectifying valve.8th Dec 1922Box 41 \ 2  Scan015
Copy of a letter from The British Thomson-Houston Company Limited regarding their inability to quote for wireless valves.29th Dec 1922Box 41 \ 2  Scan016
Letter from The Edison Swan Electric Co. Ltd. regarding a request for special wireless valves.20th Dec 1922Box 41 \ 2  Scan017
Letter from The M.O. Valve Co. Ltd. regarding the supply of rectifying valves for high voltage insulation testing.21th Dec 1922Box 41 \ 2  Scan018
Postponing a meeting concerning an electrostatic voltmeter until a suitable rectifying valve has been decided upon.25th Jan 1923Box 41 \ 2  Scan019
Follow-up letter to The Edison Swan Electric Co. Ltd. regarding the status of experiments on Wireless Valves.16th Feb 1923Box 41 \ 2  Scan020
Letter from Edison Swan Electric Co. Ltd. regarding a delay in experiments concerning wireless valves.21th Feb 1923Box 41 \ 2  Scan021
Quotation for type U.2 Rectifying Valves from The M.O. Valve Co. Ltd.10th May 1923Box 41 \ 2  Scan022
Quotation from The General Electric Co. Ltd. for a Type U.2 Rectifying Valve.19th May 1923Box 41 \ 2  Scan023
Continuation sheet of a letter from The General Electric Co., Ltd.23th May 1923Box 41 \ 2  Scan024
Specification and quotation for an oscillograph, rectifying valve, and electrostatic voltmeter.23th May 1923Box 41 \ 2  Scan025
Suitable voltage ranges for an instrument and seeking confirmation on oscillograph expenditure.23th May 1923Box 41 \ 2  Scan026
Letter regarding the successful manufacturing of a rectifying Wireless Valve.31th May 1923Box 41 \ 2  Scan027
Inquiry to General Electric Co. for specific power rectifying valves for high voltage tests.15th Oct 1926Box 41 \ 2  Scan028
Technical note on the production testing of coil cases using a trembler ignition coil.15th Oct 1926Box 41 \ 2  Scan029
Correspondence with the General Electric Co. Ltd. about a new power rectifying valve.4th Nov 1926Box 41 \ 2  Scan030
Required voltage for a rectifying valve and correcting a filament current specification.6th Nov 1926Box 41 \ 2  Scan031
The failure of the General Electric Co. to provide prices for two rectifying valves for high tension D.C. insulation tests.15th Nov 1926Box 41 \ 2  Scan032
Letter from The General Electric Co. Ltd. regarding the unavailability of a specific rectifying valve and offering alternatives.12th Nov 1926Box 41 \ 2  Scan033
Correspondence querying inconsistent filament current specifications for a rectifying valve used in insulation tests.16th Nov 1926Box 41 \ 2  Scan034
Continuation page of a document correcting a quoted electrical resistance value.29th Nov 1926Box 41 \ 2  Scan035
Communication regarding an order for a Rectifying Valve for High Tension D.C. Insulation Tests.29th Nov 1926Box 41 \ 2  Scan036
Letter from The General Electric Co. Ltd. regarding the supply and pricing of an E.H.T. No.2 valve.27th Nov 1926Box 41 \ 2  Scan037
And ordering two specific Osram rectifying valves for high tension D.C. insulation tests.8th Dec 1926Box 41 \ 2  Scan038
Letter to the General Electric Co. Ltd. regarding discrepancies and test results for a U.4 Rectifying Valve.11th Dec 1926Box 41 \ 2  Scan039
Report page discussing the results of valve tests, including emission curves and recommended operational parameters.11th Dec 1926Box 41 \ 2  Scan040
Particulars and results of a test on an Osram U4 Rectifying Valve.11th Dec 1926Box 41 \ 2  Scan041
The arrival of rectifying valves and leaflets for H.T. D.C. insulation tests.15th Dec 1926Box 41 \ 2  Scan042
Letter from The General Electric Co. Ltd. regarding a U.4 type Rectifying valve.1st Jan 1927Box 41 \ 2  Scan043
Continuation sheet of a letter from The General Electric Co., Ltd. regarding an attachment.6th Jan 1927Box 41 \ 2  Scan044
Letter to The General Electric Co. Ltd. concerning test results and the replacement of a U.4. rectifying valve.6th Jan 1927Box 41 \ 2  Scan045
Letter from The General Electric Co., Ltd. regarding a U.4. Rectifying Valve.10th Jan 1927Box 41 \ 2  Scan046
Arranging the exchange of a U.4 rectifying valve.11th Jan 1927Box 41 \ 2  Scan047
Letter from The General Electric Co. Ltd. regarding a complaint about a U.4 valve and enclosed characteristic curves.27th Jan 1927Box 41 \ 2  Scan048
Continuation page of a letter from The General Electric Co., Ltd.28th Jan 1927Box 41 \ 2  Scan049
Letter to General Electric Co. Ltd. explaining test result differences for a U.4 valve, with accompanying circuit diagrams.28th Jan 1927Box 41 \ 2  Scan050
Page 2 of a letter discussing the performance and advertisement of a valve's delivery curve.14th Jan 1927Box 41 \ 2  Scan051
Graph plotting three performance curves (A, B, C) for a U.I. Valve, with associated circuit diagrams for testing at 189 Volts AC.14th Jan 1927Box 41 \ 2  Scan052
Faint, handwritten archival document with a red ink stamp in the bottom right corner.28th Jan 1927Box 41 \ 2  Scan053
Describing a portable rectifying unit for high voltage D.C. insulation testing.29th Apr 1927Box 41 \ 2  Scan054
Page describing the operation of a valve for generating high D.C. voltage for insulation testing.29th Apr 1927Box 41 \ 2  Scan055
Page describing the use and functionality of an apparatus for testing D.C. insulation resistance.29th Apr 1927Box 41 \ 2  Scan056
The final development and application of an insulation testing apparatus for redmanol coil cases.29th Apr 1927Box 41 \ 2  Scan057
Circuit diagram for a High Tension Rectifying Unit used for H.T.D.C tests of insulation.29th Apr 1927Box 41 \ 2  Scan058
Blank page with a date stamp from Derby.29th Apr 1927Box 41 \ 2  Scan059
Connection diagram for high-tension direct current insulation tests using a trembler coil and rectifying valve.29th Apr 1927Box 41 \ 2  Scan060
Two-page document with a blank left page and illegible text on the right, bearing a purple date stamp.29th Apr 1927Box 41 \ 2  Scan061
Faulty G.E.C. rectifying valve, type U3, and the urgent request for its replacement.7th Oct 1927Box 41 \ 2  Scan062
Letter from a supplier regarding the return and replacement of a rectifying valve.10th Oct 1927Box 41 \ 2  Scan063
Suitability of a replacement rectifying valve and potential solutions to prevent filament distortion.11th Oct 1927Box 41 \ 2  Scan064
Letter from General Electric Co. Ltd. responding to a query about a U.3. Rectifying Valve.24th Oct 1927Box 41 \ 2  Scan065
Letter from The General Electric Co., Ltd. reporting on the test results of a valve under high voltage.28th Oct 1927Box 41 \ 2  Scan066


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