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
Arrival of insulated segments for a Northcliffe & Williamson Ignition Switch.25th Jan 1915Box 31 \ 2  Scan011
To Mr Matthews regarding the urgent need to locate returned parts for a Northcliffe & Williamson Ignition Switch.26th Jan 1915Box 31 \ 2  Scan012
Instruction sheet detailing experiments incorporated on chassis 49 GB.1st Mar 1915Box 31 \ 2  Scan013
Note regarding an insulated switch fitted to the steering column of chassis 1920.11th Mar 1915Box 31 \ 2  Scan014
Letter discussing alternative schemes for charging ignition accumulators, referencing a suggestion from a Mr. Crampton.13th Apr 1915Box 31 \ 2  Scan015
Fault where an engine could be started by switching on the lights, and its resolution using a two-pole insulated switch.19th Feb 1920Box 31 \ 2  Scan016
Challenges and solutions for recharging ignition accumulators using the car's lighting battery.19th Feb 1920Box 31 \ 2  Scan017
Continued memo discussing a missed opportunity for cost savings related to accumulators.19th Feb 1920Box 31 \ 2  Scan018
Short internal memo confirming that an Insulating Switch has been fitted to chassis 49 GB.21th Apr 1915Box 31 \ 2  Scan019
Explaining the delay in producing an insulated ignition switch for a 6-volt coil due to outsourcing issues.22th Apr 1915Box 31 \ 2  Scan020
Complaint from Mr. Royce regarding a delay on the Ignition Switch for a 6 volt Coil, and a request for a report.22th Apr 1915Box 31 \ 2  Scan021
Inquiry regarding the delivery timeline for an insulated ignition switch for several cars, including 49GB.7th May 1915Box 31 \ 2  Scan022
Satisfactory road test of an ignition switch for a 6-volt coil, recommending further testing before standardisation.3rd Jun 1915Box 31 \ 2  Scan023
Report on an ignition switch for a 6 volt coil.27th Jul 1914Box 31 \ 2  Scan024
Proposing the standardization of an insulated battery switch fitted on the steering column.26th Apr 1917Box 31 \ 2  Scan025
The experimental fitting of an insulated ignition switch to a chassis.26th May 1915Box 31 \ 2  Scan026
Explaining the safety reasons and necessity for using an insulated ignition switch.8th Jul 1915Box 31 \ 2  Scan027
Internal query regarding the status of an ignition switch for a 6-volt coil.5th Aug 1915Box 31 \ 2  Scan028
And handwritten notes regarding a report on an experiment for an Ignition Switch for a 6 volt Coil.12th Aug 1915Box 31 \ 2  Scan029
Insulated ignition switch for a steering column, recommending its standardisation.12th Aug 1915Box 31 \ 2  Scan030
Short memo confirming that car 56NA, currently with Mr Royce, has been fitted with a particular system.19th Aug 1915Box 31 \ 2  Scan031
Three proposed changes for the ignition system, relating to the switch insulation, coil voltage, and a two-way battery switch.19th Aug 1915Box 31 \ 2  Scan032
Ignition Switch for a 6-volt coil, containing instructions to proceed with standardisation papers.24th Aug 1915Box 31 \ 2  Scan033
Seeking clarification on designing or procuring a new two-way ignition switch.17th Sep 1915Box 31 \ 2  Scan034
Standardisation of an ignition switch for a 6 volt coil.18th Sep 1915Box 31 \ 2  Scan035
Fitting an experimental insulated ignition switch to an engine.22th Apr 1910Box 31 \ 2  Scan036
Note specifying a three-cell battery, 6-volt lighting, and a six-volt Carpentier trembler coil for a car fitted with a Ryan dynamo.22th Apr 1910Box 31 \ 2  Scan037
Response to a memo from Mr. Royce, approving a 'Volt scheme'.29th Sep 1915Box 31 \ 2  Scan038
Standardisation of a 6-volt coil and insulated ignition switch for the steering column.7th Oct 1915Box 31 \ 2  Scan039
Use of a Lucas junction box and its electrical contact requirements.24th May 1919Box 31 \ 2  Scan040
Design of the vibrator regulator and relay current circuits.24th May 1919Box 31 \ 2  Scan041
Notice regarding an insulated switch on the steering column for the 7CA model.14th Aug 1919Box 31 \ 2  Scan042
To Mr. Coverley regarding a print for an insulated ignition switch.14th Aug 1919Box 31 \ 2  Scan043
List of new parts for a 40/50 chassis, detailing their standardization status and implementation agreement.1st Aug 1919Box 31 \ 2  Scan044
Alteration to the starter motor relay circuit and its switch, based on Mr. Royce's directive.4th Oct 1919Box 31 \ 2  Scan045
Instructions from Mr. Royce regarding the starter motor relay circuit and steering column switch.22th May 1919Box 31 \ 2  Scan046
Notification of alterations 1612/N and 1618/N to the 40/50 Chassis Wiring Diagram N.1293.1st Oct 1919Box 31 \ 2  Scan047
Danger of engine fire due to a sparking low-tension wire near a flooded carburettor.8th Mar 1920Box 31 \ 2  Scan048
Risk of sparks from a live battery ignition switch terminal and a proposed solution to insulate it.31th Dec 1920Box 31 \ 2  Scan049
Confirming instructions have been passed to the Buying Department regarding the battery ignition switch terminals insulating thimble.2nd Jun 1921Box 31 \ 2  Scan050
The fire danger of the steering column switch.20th Jul 1921Box 31 \ 2  Scan051
Letter from Rolls Royce of America Inc. concerning the fire danger of a steering column switch and suggesting alternative solutions.28th Jun 1921Box 31 \ 2  Scan052
The investigation of battery ignition switch terminals and insulating thimble.1st Aug 1921Box 31 \ 2  Scan053
Adaptation of a Goshawk Klaxon switch and control quadrant to the 40/50 chassis.29th Aug 1922Box 31 \ 2  Scan054
Design of an auxiliary ignition switch for the 40/50 model to work with the locked switch box.13th Jan 1923Box 31 \ 2  Scan055
Specification for a three-position ignition switch for the 40/50 and 20 HP models.13th Jan 1923Box 31 \ 2  Scan056
Dual ignition system for a Boshawk cylinder head, including the design of a three-position control switch.19th Jan 1923Box 31 \ 2  Scan057
Letter from the American branch to Derby explaining the reasons for using a single ignition switch.20th Feb 1923Box 31 \ 2  Scan058
Service issues with American Bosch magnetos and battery ignition systems, and proposing switch design improvements.8th Mar 1923Box 31 \ 2  Scan059
The adaptation of a Bijur lighting switch for use as an auxiliary ignition switch for the 7-GII model.8th Mar 1923Box 31 \ 2  Scan060
Request to instruct the Works to construct a crankshaft torsion model from wood, wire and staples.22th Aug 1914Box 31 \ 2  Scan061
The construction of a crankshaft torsional model.31th Aug 1914Box 31 \ 2  Scan062
Hand-drawn sketch of a wire crankshaft model intended for destructive testing.10th Sep 1914Box 31 \ 2  Scan063
Progress update on the Crankshaft Torsional Model.10th Sep 1914Box 31 \ 2  Scan064
Instruction sheet regarding a crankshaft torsional model.10th Sep 1914Box 31 \ 2  Scan065
Handover and despatch of the Crankshaft Torsion Model X.1418.10th Sep 1914Box 31 \ 2  Scan066
Instruction note for the despatch of a crankshaft torsion model to F.H. Royce.11th Sep 1914Box 31 \ 2  Scan067
Production and dispatch of a crankshaft torsion model.10th Sep 1914Box 31 \ 2  Scan068
Results of crankshaft torsion tests on a 20 HP shaft, from its initial forging to the finished state.12th Dec 1927Box 31 \ 2  Scan069
Page discussing discrepancies in crankshaft stiffness calculations and the reinforcing effect of bearings.12th Dec 1927Box 31 \ 2  Scan070
Tests on crankshaft stiffness, deflection, and 'bell-mouthing' for various engine models.9th Dec 1927Box 31 \ 2  Scan071
Graph showing the deflection of a central journal when twisting a 20 HP crankshaft.9th Dec 1927Box 31 \ 2  Scan072
The reverse side of a document featuring a purple ink date stamp from the Derby office.10th Dec 1927Box 31 \ 2  Scan073
Graph of crankshaft torsion tests comparing torque vs. twist for various Phantom & 20 HP crankshaft configurations.7th Dec 1927Box 31 \ 2  Scan074
Table of torsion test results for a 20 HP crankshaft from forging to finished shaft.7th Dec 1927Box 31 \ 2  Scan075
Graph showing the results of a 20 HP crankshaft torsion test, tracking changes from forging to the finished shaft.6th Dec 1927Box 31 \ 2  Scan076
Blank, folded document page with a purple 'Print Room' date stamp.10th Dec 1927Box 31 \ 2  Scan077
Responses from the Chief Engineers of Sunbeam and Vauxhall to an article about the 'Battle of the Valves'.1st Aug 1914Box 31 \ 2  Scan078
Paper on poppet valve design, discussing seat widths, side thrust, and the effects of carbon on valve seatings.31th Oct 1914Box 31 \ 2  Scan079
Article discussing side pressure on valve stems and poppet valve design.31th Oct 1914Box 31 \ 2  Scan080
Forwarding a circular about the 'Apex' Priming & Compression Valve from W. Edward Storey.12th Oct 1920Box 31 \ 2  Scan081
Arranging an interview with the patentee's representative for a Micrometer Valve Adjustment Device.7th May 1923Box 31 \ 2  Scan082
From Hs. to CMS regarding a proposed visit to Derby by Mr. Watson.23th May 1923Box 31 \ 2  Scan083
Properties and use of aluminium bronze for inserted valve seats, quoting the S.A.E. journal.27th Sep 1926Box 31 \ 2  Scan084
Follow-up request for test results and an opinion on valve springs from the Anglo American Steel Company.19th Oct 1926Box 31 \ 2  Scan085
Composition of 'Ochromite' valves and a proposal to order a set for the Condor engine.9th Jun 1927Box 31 \ 2  Scan086
Request to manufacture dummy valves in aluminium for testing valve shapes for efficient induction.19th Oct 1928Box 31 \ 2  Scan087
Variations in the Brinell hardness of aluminium bronze valve seatings and proposing tests on a harder material.18th Jul 1929Box 31 \ 2  Scan088
Cause of noisy valve gear due to manufacturing inaccuracies of the cam toe.27th Mar 1933Box 31 \ 2  Scan089
Engine improvements by increasing inlet valve area and cylinder count for greater power output.18th May 1933Box 31 \ 2  Scan090
Engine valve particulars and their effect on performance across different models.18th May 1933Box 31 \ 2  Scan091
Comparison table of performance metrics for various engine cylinder configurations.14th Jul 1933Box 31 \ 2  Scan092
Instructions for modifying Phantom II cylinder head sections for experimental airflow work.14th Jul 1933Box 31 \ 2  Scan093
Requesting a wooden model of an improved inlet valve port for a Bentley engine to be made for testing on a blower rig.17th Jul 1933Box 31 \ 2  Scan094
Requesting the replacement of old valves with the latest type on a Phantom II cylinder head.20th Jul 1933Box 31 \ 2  Scan095
Unsuccessful larger inlet valves for an 8 Litre Phantom due to being too heavy, requesting modification.21th Jul 1933Box 31 \ 2  Scan096
Requesting an 8 litre and a 4 litre Bentley cylinder head for testing the orifice coefficient of valve ports.22th Jul 1933Box 31 \ 2  Scan097
Request for valve springs and cotters to complete tests on a borrowed Bentley 8 Litre cylinder block.27th Jul 1933Box 31 \ 2  Scan098
Tests comparing the efficiency of valving on Phantom II and Bentley engines.24th Aug 1933Box 31 \ 2  Scan099
Tests for compression pressure, volumetric efficiency, and air flow across various cylinder head and valve configurations.24th Aug 1933Box 31 \ 2  Scan100
Summary of various air flow and pressure difference tests for different engine cylinder heads and valves.24th Aug 1933Box 31 \ 2  Scan101
List of air flow and pressure difference tests on various valve and cylinder head configurations.24th Aug 1933Box 31 \ 2  Scan102
Deductions from tests on the Phantom engine, focusing on valve lift, efficiency, and size.24th Aug 1933Box 31 \ 2  Scan103
Analysis of engine port shape and design, comparing 8-litre Phantom and Bentley cylinder heads.24th Aug 1933Box 31 \ 2  Scan104
Airflow tests conducted on experimental wooden models of engine heads with different port and valve designs.24th Aug 1933Box 31 \ 2  Scan105
Analysis comparing engine performance based on port design, air flow, and valve size for Phantom and Bentley heads.24th Aug 1933Box 31 \ 2  Scan106
Potential engine performance improvements for Rolls-Bentley and Phantom models by modifying head design and camshafts.24th Aug 1933Box 31 \ 2  Scan107
Diagrams illustrating the method of shrouding a valve for air flow tests and modifications to an inlet valve.24th Aug 1933Box 31 \ 2  Scan108
Diagrammatic arrangement of a rig used in cylinder head air flow tests.24th Aug 1933Box 31 \ 2  Scan109
Blueprint diagram showing a cross-section of a modified inlet valve.24th Aug 1933Box 31 \ 2  Scan110


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