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
Evaluating the Buckley Patent Adjustable Tappets.20th Mar 1935Box 158 \ 4  scan0023
Requirements for adjustable tappet mechanisms and concluding that the Buckley patent device is unsuitable.2nd Apr 1935Box 158 \ 4  scan0024
Rejecting a proposed improvement for Cadillac Automatic Tappets after comparison with a previous design.5th Apr 1935Box 158 \ 4  scan0025
Confidential letter regarding a new 'Valve Slack Adjuster' design, seeking an opinion on its potential improvement over an existing patent.11th Mar 1935Box 158 \ 4  scan0026
Extract of a letter from General Motors Corporation regarding a valve and slack adjuster mechanism.9th Jan 1935Box 158 \ 4  scan0027
The design and experimental determination of parameters for a spherical valve and plunger mechanism.12th Nov 1935Box 158 \ 4  scan0028
Letter from Rudge-Whitworth Ltd requesting drawings for valve lift diagrams and tappet arrangements.12th Nov 1935Box 158 \ 4  scan0029
Letter to Rudge-Whitworth Ltd. enclosing drawings for self-adjusting tappets and requesting information on hardened piston rings.16th Nov 1935Box 158 \ 4  scan0030
Letter from a supplier discussing their design and manufacturing practices for valve springs.18th May 1936Box 158 \ 4  scan0031
Technical discussion on valve spring surge, calculation methods, and wire material selection.18th May 1936Box 158 \ 4  scan0032
Letter detailing the manufacturing process for valve springs, including heat treatment and shot blasting.8th Jun 1936Box 158 \ 4  scan0033
Technical memo discussing research on valve springs, their permissible stress range, and performance comparisons.8th Jun 1936Box 158 \ 4  scan0034
Graph showing the average stress range for good carbon steel wire and total static stress variation on valve springs.6th Jun 1936Box 158 \ 4  scan0035
Graph illustrating the endurance stress range for S/CV valve springs.6th Jun 1936Box 158 \ 4  scan0036
Letter to the Wilcox-Rich Valve Corporation inquiring about American practices for exhaust valves and valve seats to prevent erosion.12th Jun 1936Box 158 \ 4  scan0037
Specification sheet for ordering compression springs and the calculation for stress.12th Jun 1936Box 158 \ 4  scan0038
Page of calculations for determining the stress and wire size for springs, including formulas and worked examples.12th Jun 1936Box 158 \ 4  scan0039
The formula for calculating spring deflection with worked examples.12th Jun 1936Box 158 \ 4  scan0040
Page detailing calculations for helical compression springs and formulas for square wire springs.12th Jun 1936Box 158 \ 4  scan0041
Page discussing a spring design formula from a 1925 S.A.E. Journal and introducing a subsequent table of formulas.12th Jun 1936Box 158 \ 4  scan0042
Page detailing formulas and design considerations for round and square wire springs.12th Jun 1936Box 158 \ 4  scan0043
Graph showing the actual stress curve of helical compression springs.12th Jun 1936Box 158 \ 4  scan0044
Table of suggested total stress for helical compression springs made of various materials.12th Jun 1936Box 158 \ 4  scan0045
Page detailing the B-G-R formula for the quick computation of vibration frequency.12th Jun 1936Box 158 \ 4  scan0046
Specification sheet outlining formulas and constants for calculating extension springs.12th Jun 1936Box 158 \ 4  scan0047
Page of calculations for spring properties including stress, energy, and modulus of resilience, with a worked example.12th Jun 1936Box 158 \ 4  scan0048
Calculations for spring resilience, energy absorption, and material weight.12th Jun 1936Box 158 \ 4  scan0049
Specification guide for ordering torsion springs, including calculation formulas and diagrams of various types.12th Jun 1936Box 158 \ 4  scan0050
Reference table of the third and fourth powers of various wire diameters.24th Jun 1936Box 158 \ 4  scan0051
Letter from Wilcox-Rich Corporation informing of the death of Mr. Robert Jardine.24th Jun 1936Box 158 \ 4  scan0052
Letter from Wilcox-Rich Corporation regarding American practices on engine inserts and valve seats.23th Jun 1936Box 158 \ 4  scan0053
Letter from Wilcox-Rich Corporation regarding an ideal combination of austenitic type valves and Stellite-faced inserts.23th Jun 1936Box 158 \ 4  scan0054
Graph of safe stress ranges for valve spring wire, comparing Chrome-Vanadium and Carbon Steel.10th Sep 1936Box 158 \ 4  scan0055
Letter from Ethyl Export Corporation enclosing a memorandum on valve steels and arranging a meeting in Derby.10th Sep 1936Box 158 \ 4  scan0056
Bulletin detailing the composition and naming conventions of Silchrome 'X' series valve steels.10th Sep 1936Box 158 \ 4  scan0057
The properties and potential use of a new steel compared to Silchrome.18th Sep 1936Box 158 \ 4  scan0058
Request for assistance with valve spring failures on a new 12-cylinder car.18th Sep 1936Box 158 \ 4  scan0059
Letter from Barnes-Gibson-Raymond Inc. regarding the design and specification of springs.28th Sep 1936Box 158 \ 4  scan0060
Material standard specification for valve spring steel wire.28th Sep 1936Box 158 \ 4  scan0061
Material standard sheet detailing physical properties, surface requirements, and size variations for wire.28th Sep 1936Box 158 \ 4  scan0062
Material standard sheet detailing the procedures for steel inspection, rejections, and replacements.10th Oct 1936Box 158 \ 4  scan0063
Letter to Barnes-Gibson-Raymond Inc. regarding the production of valve springs for a Bentley vehicle.10th Oct 1936Box 158 \ 4  scan0064
Graph plotting the average stress range for good carbon steel wire against various automotive components.10th Oct 1936Box 158 \ 4  scan0065
Fatigue limit diagram for Steel #1, with stresses calculated by the Wahl formula.10th Oct 1936Box 158 \ 4  scan0066
Stress-Strain diagram for Steel #1, showing Torsion and Tension curves and material properties.10th Oct 1936Box 158 \ 4  scan0067
Fatigue limit diagram for Steel #1A, with stresses calculated by the Wahl formula.10th Oct 1936Box 158 \ 4  scan0068
Stress-strain diagram for Steel #1, showing both torsion and tension curves.10th Oct 1936Box 158 \ 4  scan0069
Fatigue limit diagram for pretempered wire steel #4.10th Oct 1936Box 158 \ 4  scan0070
Stress-strain diagram for pretempered wire steel, showing both tension and torsion curves.10th Oct 1936Box 158 \ 4  scan0071
Fatigue limit diagram for pretempered wire steel, with stresses calculated by the Wahl formula.10th Oct 1936Box 158 \ 4  scan0072
Stress-strain diagram for pretempered wire steel #7, showing tension and torsion curves.10th Oct 1936Box 158 \ 4  scan0073
Fatigue limit diagram for special tempered steel number 11.10th Oct 1936Box 158 \ 4  scan0074
Stress-strain diagram for Special Tempered Steel #11, showing both tension and torsion curves.10th Oct 1936Box 158 \ 4  scan0075
Fatigue limit diagram for special cold drawn spring steel #12, with stresses calculated by Wahl formula.10th Oct 1936Box 158 \ 4  scan0076
Stress-strain diagram for special cold drawn spring steel #12, showing tension and torsion curves.10th Oct 1936Box 158 \ 4  scan0077
Fatigue limit diagram for Silico-Manganese Steel #8.10th Oct 1936Box 158 \ 4  scan0078
Stress-Strain diagram for Silico-Manganese Steel #8, showing tension and torsion curves.10th Oct 1936Box 158 \ 4  scan0079
Stress-strain diagram for Stainless Steel #9, showing tension and torsion curves.10th Oct 1936Box 158 \ 4  scan0080
Fatigue limit diagram for stainless steel calculated by Wahl formula.10th Oct 1936Box 158 \ 4  scan0081
Fatigue limit diagram for High Manganese Steel #13, with stresses calculated by Wahl formula.10th Oct 1936Box 158 \ 4  scan0082
Stress-strain diagram for High Manganese Steel #13, detailing tension and torsion curves.14th Oct 1936Box 158 \ 4  scan0083
Letter from Coventry Climax Engines Ltd. regarding the delayed announcement of the Skinner Slide Valve Engine.14th Oct 1936Box 158 \ 4  scan0084
Letter from Barnes-Gibson-Raymond forwarding three lots of spring samples for testing.19th Oct 1936Box 158 \ 4  scan0085
Improving carbon steel wire production methods and commissioning experiments with supplier Geo. Fox & Co.27th Oct 1936Box 158 \ 4  scan0086
Letter to The Tempered Spring Co. Ltd. requesting a trial production of 24 valve springs from 'Low carbon steel'.27th Oct 1936Box 158 \ 4  scan0087
Specification and analysis sheet for a valve spring outer.14th May 1936Box 158 \ 4  scan0088
Sourcing Hard Drawn Piano Wire for valve springs and clarifying the oil tempering process.28th Oct 1936Box 158 \ 4  scan0089
Letter from The Tempered Spring Company Limited regarding the production of twenty-four trial valve springs.28th Oct 1936Box 158 \ 4  scan0090
Letter to Coventry Climax Engines expressing interest in their Overhead Inlet Side Valve Exhaust Units.29th Oct 1936Box 158 \ 4  scan0091
Request to purchase and test Ford V-8 valve tappets for material and hardness analysis.31th Oct 1936Box 158 \ 4  scan0092
Inquiry to The Tempered Spring Co. Ltd. regarding the manufacturing process of valve springs.2nd Nov 1936Box 158 \ 4  scan0093
Inquiry to The Lion Spring Co. regarding the manufacturing process of valve springs made from Swedish wire.2nd Nov 1936Box 158 \ 4  scan0094
Order for valve springs from the Vauxhall Co.2nd Nov 1936Box 158 \ 4  scan0095
Letter from The Tempered Spring Co. Ltd. regarding the production of valve springs from special Swedish wire.3rd Nov 1936Box 158 \ 4  scan0096
Letter from Vauxhall Motors Ltd acknowledging receipt of a letter but requesting a copy of a missing report.3rd Nov 1936Box 158 \ 4  scan0097
Letter to Vauxhall Motors Ltd. enclosing a Micro-Examination Report on a valve spring.4th Nov 1936Box 158 \ 4  scan0098
Letter to The Tempered Spring Co., Ltd. requesting a delivery date for 24 valve springs.4th Nov 1936Box 158 \ 4  scan0099
Valve spring particulars for Rover vehicles, listing suppliers.4th Nov 1936Box 158 \ 4  scan0100
Letter from The Lion Spring Company regarding the manufacturing process of valve springs from Swedish wire.4th Nov 1936Box 158 \ 4  scan0101
Request to The Lion Spring Co. Ltd. for trial valve springs made from low carbon steel.5th Nov 1936Box 158 \ 4  scan0102
Letter from The Tempered Spring Co. Ltd. regarding a delay in despatching special valve springs.5th Nov 1936Box 158 \ 4  scan0103
Request to pass an official order to The Tempered Spring Co. Ltd. for 24 valve springs for Bentley.16th Nov 1936Box 158 \ 4  scan0104
Letter to The Tempered Spring Co. Ltd. acknowledging receipt of 24 valve springs for an Endurance engine test.16th Nov 1936Box 158 \ 4  scan0105
Letter to The Tempered Spring Co. regarding a failed valve spring and an urgent order for new ones.24th Nov 1936Box 158 \ 4  scan0106
Letter to The Tempered Spring Co. discussing the laboratory analysis of a broken valve spring and requesting a delivery date for a new order.28th Nov 1936Box 158 \ 4  scan0107
Letter to The Tempered Spring Co. about a delay in receiving sample springs and a request for an additional set.4th Dec 1936Box 158 \ 4  scan0108
Requesting official orders to be placed for two sets of 24 valve springs.4th Dec 1936Box 158 \ 4  scan0109
Acquisition and proposed testing of Swedish wire for various engine valve springs.17th Dec 1936Box 158 \ 4  scan0110
Letter to The Tempered Spring Co. regarding the receipt and testing of a batch of valve springs.17th Dec 1936Box 158 \ 4  scan0111
Requesting an order of Swedish wire for making new Phantom III single valve springs.22th Dec 1936Box 158 \ 4  scan0112
The substitution of Ubas steel with a low carbon case hardening mild steel for chassis parts.22th Dec 1936Box 158 \ 4  scan0113
Extract from a letter received from the Rover Co. concerning complaints of broken valve springs.23th Dec 1936Box 158 \ 4  scan0114
Micro-examination report investigating a broken valve spring from a Bentley B-114-HK.30th Dec 1936Box 158 \ 4  scan0115
Requesting the experimental production of chassis valve springs from Swedish wire.4th Jan 1937Box 158 \ 4  scan0116
Valve lubrication schemes, specifically the wedge and felt systems, in relation to a 15,000-mile test on the 35-EX model.15th Jan 1937Box 158 \ 4  scan0117
Confirming an urgent request for differentially coiled valve springs made from carbon wire.28th Jan 1937Box 158 \ 4  scan0118
Status of coiling differentially-coiled valve springs, awaiting material from Sweden.30th Jan 1937Box 158 \ 4  scan0119
Letter to The Tempered Spring Co. regarding the satisfactory performance of 'Swedish Wire' springs and a request for further sets for testing.10th Feb 1937Box 158 \ 4  scan0120
Request and confirmation to order 6 sets (72) of valve springs from the Tempered Spring Co.15th Feb 1937Box 158 \ 4  scan0121
New, closely coiled valve springs made from Swedish wire, requesting they be fitted to B-17 and B-9 test engines.15th Feb 1937Box 158 \ 4  scan0122


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