| Description | Date | Identifier | |
| Letter from Westinghouse regarding a trial of experimental Westinghouse Air Springs on a chassis. | 28th Sep 1926 | Box 43 \ 3 Scan025 | |
| Letter to Westinghouse Brake Co. Ltd. enquiring about fitting their air springs to a chassis. | 29th Sep 1926 | Box 43 \ 3 Scan026 | |
| Letter from Westinghouse Brake & Saxby Signal Company requesting chassis drawings regarding Westinghouse Air Springs. | 30th Sep 1926 | Box 43 \ 3 Scan027 | |
| The supply and arrangement of auxiliary air springs to be used in conjunction with leaf springs. | 5th Oct 1926 | Box 43 \ 3 Scan028 | |
| Letter to the Westinghouse Brake Co. Ltd. regarding drawings and testing of their Air Springs. | 5th Oct 1926 | Box 43 \ 3 Scan029 | |
| Letter concerning a missing drawing, number E.73699, for Westinghouse Air Springs. | 6th Oct 1926 | Box 43 \ 3 Scan030 | |
| Letter to the Westinghouse Brake Co. Ltd. about despatched drawings, one of which was incomplete. | 7th Oct 1926 | Box 43 \ 3 Scan031 | |
| Inter-office letter from the American branch to the English branch regarding communications with Westinghouse companies. | 8th Oct 1926 | Box 43 \ 3 Scan032 | |
| Letter from Rolls Royce of America to Rolls Royce Ltd regarding correspondence with Westinghouse companies. | 8th Oct 1926 | Box 43 \ 3 Scan033 | |
| Letter from Rolls Royce of America to Derby regarding Westinghouse Brake & Saxby Signal Company. | 8th Oct 1926 | Box 43 \ 3 Scan034 | |
| Letter from Westinghouse concerning the installation of air springs, including a blueprint and a photograph. | 10th Nov 1926 | Box 43 \ 3 Scan035 | |
| Photograph of a roadster equipped with Westinghouse Air Springs. | 10th Nov 1926 | Box 43 \ 3 Scan036 | |
| Photograph of a vintage sedan car, side profile. | 11th Nov 1926 | Box 43 \ 3 Scan037 | |
| Letter to The Westinghouse Brake Co. Ltd. discussing the experimental fitting of an air spring device and requesting modifications to the adaptors. | 11th Nov 1926 | Box 43 \ 3 Scan038 | |
| Letter from Westinghouse confirming a revised scheme that will not require cutting a car frame. | 16th Nov 1926 | Box 43 \ 3 Scan039 | |
| Letter from Westinghouse regarding a drawing for a chassis arrangement that avoids cutting the frame ends. | 26th Nov 1926 | Box 43 \ 3 Scan040 | |
| Letter to The Westinghouse Brake Co. Ltd. regarding a scheme for fitting parts to a car. | 27th Nov 1926 | Box 43 \ 3 Scan041 | |
| Letter from the Westinghouse Brake & Saxby Signal Company acknowledging a letter and arranging for parts to be sent. | 29th Nov 1926 | Box 43 \ 3 Scan042 | |
| Letter from the Westinghouse Brake & Saxby Signal Company regarding the trial of 'Highway' model air springs. | 18th Jan 1927 | Box 43 \ 3 Scan043 | |
| Spring suspension characteristics and testing. | 7th Feb 1927 | Box 43 \ 3 Scan044 | |
| Requesting an examination of the O'Neil Air Springs device. | 5th Mar 1927 | Box 43 \ 3 Scan045 | |
| Returning the specification for the O'Neill Air Spring with an opinion on its merits. | 8th Mar 1927 | Box 43 \ 3 Scan046 | |
| Comparing the O'Neill air suspension system with the Westinghouse and Lancia type suspensions. | 1st Mar 1927 | Box 43 \ 3 Scan047 | |
| Letter from Westinghouse Brake & Saxby Signal Co. Ltd. inquiring about the testing of previously supplied air springs. | 5th May 1927 | Box 43 \ 3 Scan048 | |
| Letter to The Westinghouse Brake Co. Ltd. regarding the testing of their air springs on a car. | 7th May 1927 | Box 43 \ 3 Scan049 | |
| Letter from Westinghouse Brake & Saxby Signal Company following up on loaned air springs for trial. | 3rd Jan 1928 | Box 43 \ 3 Scan050 | |
| Letter to The Westinghouse Brake Co. regarding a delay in testing air springs due to other urgent work. | 4th Jan 1928 | Box 43 \ 3 Scan051 | |
| Follow-up letter from Westinghouse Brake & Saxby Signal Company regarding feedback on a set of Air Springs. | 1st Aug 1928 | Box 43 \ 3 Scan052 | |
| Letter to The Westinghouse Brake Co. Ltd. regarding the status of testing their Air Springs. | 14th Aug 1923 | Box 43 \ 3 Scan053 | |
| Follow-up letter from a supplier requesting permission to invoice for air springs. | 15th Aug 1928 | Box 43 \ 3 Scan054 | |
| Returning two loaned air springs to The Westinghouse Brake Co. | 20th Aug 1928 | Box 43 \ 3 Scan055 | |
| Letter regarding the dispatch of two unused Air Springs to The Westinghouse Brake Co. | 20th Aug 1923 | Box 43 \ 3 Scan056 | |
| Blueprint detailing a 3-inch air spring installation for a Phantom model, showing modifications to the frame end. | 26th Oct 1926 | Box 43 \ 3 Scan057 | |
| Proposed alterations to cam forms and valve timing for Scheme 723. | 21th Jul 1926 | Box 43 \ 3 Scan058 | |
| Mr. Royce's remarks on temporary modifications to the Falcon 10 engine's cam forms. | 22th Jul 1926 | Box 43 \ 3 Scan059 | |
| Proposal to produce a new set of camshafts for experimentation. | 23th Jul 1926 | Box 43 \ 3 Scan060 | |
| Valve timing diagrams for the Falcon X engine with different clearances. | 23th Jul 1926 | Box 43 \ 3 Scan061 | |
| Comparing valve open diagrams of the Curtiss and F.10 engines, discussing high-lift and exhaust cams. | 12th Aug 1926 | Box 43 \ 3 Scan062 | |
| Valve lift diagram for the Curtiss D12 engine number 252. | 12th Aug 1926 | Box 43 \ 3 Scan063 | |
| The reverse of a document page featuring a 'Print Room' stamp and a handwritten reference number and date. | 12th Aug 1926 | Box 43 \ 3 Scan064 | |
| Graph comparing the inlet valve lift diagrams for the Falcon X and Curtiss D12 engines. | 12th Aug 1926 | Box 43 \ 3 Scan065 | |
| Blank logbook page with a small sketch, handwritten reference, and stamped date. | 12th Aug 1926 | Box 43 \ 3 Scan066 | |
| Diagram comparing the exhaust valve lift of the Falcon X and Curtiss D12 engines. | 25th Aug 1926 | Box 43 \ 3 Scan067 | |
| Instruction to change the material of camshaft bearings from Phosphor Bronze to Aluminium. | 25th Aug 1926 | Box 43 \ 3 Scan068 | |
| Modifications to the rocker mechanism to accommodate triple valve springs. | 28th Aug 1926 | Box 43 \ 3 Scan069 | |
| Strengthening the F.10 inlet rocker and proposing a comparative test against the old design. | 16th Sep 1926 | Box 43 \ 3 Scan070 | |
| The preparation of a 3-F-X engine with low compression for camshaft and valve comparison tests. | 1st Oct 1926 | Box 43 \ 3 Scan071 | |
| The preparation of a 3-F-X low compression engine for camshaft and valve comparison tests. | 4th Oct 1926 | Box 43 \ 3 Scan072 | |
| Preliminary runs for camshaft and valve comparisons on a Falcon X low compression engine, noting issues with high oil consumption and bearing leaks. | 5th Oct 1926 | Box 43 \ 3 Scan073 | |
| The despatch of a camshaft drive off an F.X. for examination. | 12th Oct 1926 | Box 43 \ 3 Scan074 | |
| Camshaft drive failure and proposed modifications for the Falcon 10 and Condor engines. | 14th Oct 1926 | Box 43 \ 3 Scan075 | |
| Sketch showing the fracture of a Falcon X lower camshaft drive housing. | 17th Nov 1926 | Box 43 \ 3 Scan076 | |
| Report of a strengthened inlet rocker failure, possibly caused by a broken inner valve spring. | 26th Nov 1926 | Box 43 \ 3 Scan077 | |
| The despatch of a broken inlet rocker to Mr. Royce for inspection. | 26th Nov 1926 | Box 43 \ 3 Scan078 | |
| Leakage and design issues with the camshaft drive and hand turning gear. | 27th Nov 1926 | Box 43 \ 3 Scan079 | |
| Endurance tests conducted on a wet liner engine. | 27th Nov 1926 | Box 43 \ 3 Scan080 | |
| With a diagram proposing a design for a revolution indicator drive on a camshaft. | 29th Nov 1926 | Box 43 \ 3 Scan081 | |
| Letter discussing alterations to the F.X. Camshaft Drive and Hand Turning Gear. | 30th Nov 1926 | Box 43 \ 3 Scan082 | |
| 10-hour non-stop hangar test of an F.10 engine which resulted in a camshaft failure. | 1st Dec 1926 | Box 43 \ 3 Scan083 | |
| Page 2 of an engine test report detailing performance data and adjustments made to magneto gap and tappet clearances. | 1st Dec 1926 | Box 43 \ 3 Scan084 | |
| The dispatch of a broken rocker shaft to Mr. Royce for inspection. | 1st Dec 1926 | Box 43 \ 3 Scan085 | |
| Notice of material modification and heat treatment for R.R.F.X. Rocker Shafts. | 14th Dec 1926 | Box 43 \ 3 Scan086 | |
| Rocker shaft failure after 25 hours, proposing a change in material to a higher carbon, heat-treated steel tube. | 2nd Dec 1926 | Box 43 \ 3 Scan087 | |
| Design of a spring-mounted tachometer drive on a camshaft, referencing drawing LeC.2331. | 12th Mar 1926 | Box 43 \ 3 Scan088 | |
| Two mandatory modifications for R.R.F.X. engines. | 3rd Dec 1925 | Box 43 \ 3 Scan089 | |
| Analysis and proposed improvements for a broken RR.F.10 rocker arm. | 4th Dec 1926 | Box 43 \ 3 Scan090 | |
| Drawing for a breather on the crankcase and a forthcoming timing disc. | 8th Dec 1926 | Box 43 \ 3 Scan091 | |
| Drawings for gungar, stronger inlet rockers, and tachometer drive for the R.R. F.10. | 9th Dec 1926 | Box 43 \ 3 Scan092 | |
| Revised drawing for a camshaft drive and a request for prints. | 14th Dec 1926 | Box 43 \ 3 Scan093 | |
| Attaching a preliminary drawing of valve rockers without rollers. | 16th Dec 1926 | Box 43 \ 3 Scan094 | |
| Test report on the ability of scavenger pumps to handle additional oil in the crankcase. | 18th Dec 1926 | Box 43 \ 3 Scan095 | |
| Modifications to cam design to prevent valve float and spring breakage at high speeds. | 20th Dec 1926 | Box 43 \ 3 Scan096 | |
| Engine valve spring pressure and rating in relation to air flow. | 21th Dec 1926 | Box 43 \ 3 Scan097 | |
| Design of valve rockers and cams for a new 750 HP engine, with an accompanying sketch. | 21th Dec 1926 | Box 43 \ 3 Scan098 | |
| Causes of valve bounce, particularly the effect of air pressure versus elasticity and friction. | 22th Dec 1926 | Box 43 \ 3 Scan099 | |
| Drawings for valve rockers without rollers. | 23th Dec 1926 | Box 43 \ 3 Scan100 | |
| Design of cams, springs, and valves for an engine. | 29th Dec 1926 | Box 43 \ 3 Scan101 | |
| Design of non-roller type valve rockers and cams. | 30th Dec 1926 | Box 43 \ 3 Scan102 | |
| Expressing dissatisfaction with rollerless valve rockers and awaiting new designs. | 31th Dec 1926 | Box 43 \ 3 Scan103 | |
| Design and arrangement of exhaust rockers for a new engine. | 1st Jan 1927 | Box 43 \ 3 Scan104 | |
| Contributing factors to valve bounce in F.10 engines. | 1st Jan 1927 | Box 43 \ 3 Scan105 | |
| Valve friction, bounce, and a new apparatus for recording valve motion. | 4th Jan 1927 | Box 43 \ 3 Scan106 | |
| Graph showing the load-lift curves for F.X. inlet valves with lubricated triple springs. | 4th Jan 1927 | Box 43 \ 3 Scan107 | |
| Blueprint detailing an apparatus for recording engine valve bounce. | 4th Jan 1927 | Box 43 \ 3 Scan108 | |
| Typed document with handwritten reference numbers and a date stamp, where the main text is illegible. | 4th Jan 1927 | Box 43 \ 3 Scan109 | |
| Design improvements and testing for engine components including springs, rockers, and cylinder block studs. | 10th Jan 1927 | Box 43 \ 3 Scan110 | |
| Advantages and implementation of rollerless divided valve rockers. | 1st Jan 1927 | Box 43 \ 3 Scan111 | |
| Valve bounce and advocating for further investigation into valve spring failures. | 13th Jan 1927 | Box 43 \ 3 Scan112 | |
| Investigations into valve bounce and spring breakage on the Falcon engine, comparing double and triple spring types. | 13th Jan 1927 | Box 43 \ 3 Scan113 | |
| Report page analyzing valve bounce and spring oscillation at high camshaft speeds. | 13th Jan 1927 | Box 43 \ 3 Scan114 | |
| Tests comparing the spring motion of dual and triple springs, noting coil surging and bunching. | 13th Jan 1927 | Box 43 \ 3 Scan115 | |
| Conclusion on valve bounce and spring oscillation, proposing modifications for further testing. | 1st Jan 1929 | Box 43 \ 3 Scan116 | |
| Particulars of valve springs and a loading chart for Falcon X valve bounce tests. | 1st Jan 1929 | Box 43 \ 3 Scan117 | |
| Cover page with a handwritten reference number and a print room stamp. | 13th Jan 1927 | Box 43 \ 3 Scan118 | |
| Diagram illustrating the action of Falcon X triple valve springs just below bouncing speed. | 12th Jan 1927 | Box 43 \ 3 Scan119 | |
| Falcon X engine valve bounce tests comparing double and triple spring setups. | 12th Jan 1927 | Box 43 \ 3 Scan120 | |
| Faded and largely illegible typed document with a handwritten reference and a date stamp. | 13th Jan 1927 | Box 43 \ 3 Scan121 | |
| Design propositions for valve rockers and rocker bar centres. | 15th Jan 1927 | Box 43 \ 3 Scan122 | |
| Design alterations and progress on engine components, including cams, rockers, valve springs, and camshaft brackets. | 9th Jan 1927 | Box 43 \ 3 Scan123 | |
| Selection of new valve springs, weighing the benefits of different specifications against potential engine modifications. | 1st Jan 1927 | Box 43 \ 3 Scan124 | |
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