| Description | Date | Identifier | |
| Blueprint graph comparing the power curves of Marmon, Humber, Buick, Hup, and Dodge cars. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img022 | |
| Blueprint graph showing five different performance curves. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img023 | |
| Blueprint graph showing multiple data plots on a grid. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img024 | |
| Blueprint graph plotting various performance curves against pressure in LBS per SQ. Inch. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img025 | |
| Blueprint graph comparing the horsepower curves of various car models. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img026 | |
| Blueprint graph of Horse Power against Revolutions Per Minute for various 4 and 6 cylinder engines. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img027 | |
| Dynamometer test comparison graph for various car exhausts and silencers. | 19th May 1921 | Box 180 \ M4 \ M4.2 img028 | |
| Blueprint graph plotting multiple performance curves. | 19th May 1921 | Box 180 \ M4 \ M4.2 img029 | |
| Engineering drawing of a multi-journal shaft with dimensional details. | 19th May 1921 | Box 180 \ M4 \ M4.2 img030 | |
| Drawing of a crankshaft with a detailed section view of oil holes. | 19th May 1921 | Box 180 \ M4 \ M4.2 img031 | |
| Technical drawing of a clutch and flywheel assembly. | 19th May 1921 | Box 180 \ M4 \ M4.2 img032 | |
| Technical drawing of a crankshaft and clutch assembly components. | 19th May 1921 | Box 180 \ M4 \ M4.2 img033 | |
| Performance graph for a Hispano engine, plotting horsepower and mechanical efficiency against RPM. | 10th Mar 1924 | Box 180 \ M4 \ M4.2 img034 | |
| Graph of engine performance curves showing various pressures, volumetric efficiency, and mean effective pressure against engine RPM. | 10th Mar 1924 | Box 180 \ M4 \ M4.2 img035 | |
| Valve timing diagram and inlet valve displacement curve for a Hispano-Suiza engine. | 10th Mar 1924 | Box 180 \ M4 \ M4.2 img036 | |
| Graph of the exhaust valve displacement curve with 2 m.m. clearances. | 10th Mar 1924 | Box 180 \ M4 \ M4.2 img037 | |
| Progress on starting schemes, air pumps, and tyre pumps for Armoured Cars. | 30th Sep 1920 | Box 180 \ M5 img001 | |
| Fitting of emergency starting gear, tyre pumps, and wheel/tyre specifications for cars going abroad. | 30th Sep 1920 | Box 180 \ M5 img002 | |
| Arguing against the use of larger diameter wheels on armoured car chassis. | 30th Sep 1920 | Box 180 \ M5 img003 | |
| Reliability and choice of tyres for armoured cars. | 7th Oct 1920 | Box 180 \ M5 img004 | |
| Impulse starters for armoured cars and the design of an efficient tyre air pump. | 8th Oct 1920 | Box 180 \ M5 img005 | |
| The design of a hand starter mechanism for an engine within an armoured turret. | 10th Oct 1920 | Box 180 \ M5 img006 | |
| Production and delivery schedule for armoured cars, detailing modifications suggested by the War Office and potential delays. | 13th Oct 1920 | Box 180 \ M5 img007 | |
| Contract modifications, delays regarding a modified chassis, and a meeting with the War Office. | 13th Oct 1920 | Box 180 \ M5 img008 | |
| Flywheel gear drive, air pump, and Maxfield pump arrangements for armoured cars. | 21th Oct 1920 | Box 180 \ M5 img009 | |
| Status update on the work for armoured cars, ensuring no serious delays in chassis delivery. | 21th Oct 1920 | Box 180 \ M5 img010 | |
| Proposed fitting and positioning of a hand magneto on armoured cars. | 1st Oct 1920 | Box 180 \ M5 img011 | |
| 'N' Scheme 619, a non-standard method for mounting a battery in the frame of armoured cars. | 23th Nov 1920 | Box 180 \ M5 img012 | |
| Specification for an armoured car, detailing standard alternatives and special non-standard parts called for by the War Office. | 13th Oct 1920 | Box 180 \ M5 img013 | |
| Numbered list of specifications and modifications for a vehicle chassis, including tyres, lighting, battery, and towing hooks. | 26th Oct 1920 | Box 180 \ M5 img014 | |
| Supply status of parts for Armoured Cars, highlighting delays caused by strikes. | 26th Oct 1920 | Box 180 \ M5 img015 | |
| Production delays for tyre inflators and road springs due to strikes. | 26th Oct 1920 | Box 180 \ M5 img016 | |
| The supply and manufacturing status of various vehicle components. | 26th Oct 1920 | Box 180 \ M5 img017 | |
| Supply status and delays for towing hooks, front wings, and Michelin jacks. | 26th Oct 1920 | Box 180 \ M5 img018 | |
| Note regarding a visit to Derby in connection with 50 armoured cars for the India Office. | 13th Oct 1921 | Box 180 \ M5 img019 | |
| Proposing a stress test for an armoured car chassis on a steep gradient. | 6th Sep 1921 | Box 180 \ M5 img020 | |
| Overheating and boiling issues with Armoured Cars, referencing past demonstrations and concerns from the India Office. | 31th Aug 1921 | Box 180 \ M5 img021 | |
| Field test procedures for a light utility truck at Long Valley, Aldershot. | 31th Aug 1921 | Box 180 \ M5 img022 | |
| Special multi-stage road test in the Leith Hill district, outlining procedures for testing vehicle performance on various inclines and road surfaces. | 25th Aug 1923 | Box 180 \ M5 img023 | |
| Strategies for passing proposed trials of armoured car chassis for the India Office. | 25th Aug 1923 | Box 180 \ M5 img024 | |
| Trial conditions for armoured cars fitted with a modified rear axle. | 25th Aug 1923 | Box 180 \ M5 img025 | |
| Heavily annotated draft document outlining the conditions for a series of vehicle trials. | 25th Aug 1923 | Box 180 \ M5 img026 | |
| Trial conditions for armoured cars fitted with a modified rear axle, outlining weight, speed, and hill-climbing tests. | 23th Aug 1921 | Box 180 \ M5 img027 | |
| Test specifications and contract strategy with the India Office regarding new axles to prevent engine boiling. | 23th Aug 1921 | Box 180 \ M5 img028 | |
| Cost, guarantee, and options for fitting new experimental axles to a chassis, involving India Office officials. | 23th Aug 1921 | Box 180 \ M5 img029 | |
| To hold all work on the tyre pump controls and oil separator for armoured cars for the India Office. | 13th Apr 1921 | Box 180 \ M5 img030 | |
| India Office tests of Armoured Cars, referencing other related documents. | 31th Aug 1921 | Box 180 \ M5 img031 | |
| Specifications and delivery schedule for nineteen armoured cars destined for the India Office. | 10th May 1921 | Box 180 \ M5 img032 | |
| Cooling issue with the 40/50 HP armoured car and proposing an experiment with a fan cowl. | 8th Aug 1921 | Box 180 \ M5 img033 | |
| Specifications for armoured cars, specifically load, speed, and potential engine cooling issues during tests for the India Office. | 27th Aug 1921 | Box 180 \ M5 img034 | |
| Radiator capacity and chassis performance considerations, with reference to the War Office. | 27th Aug 1921 | Box 180 \ M5 img035 | |
| Chassis performance for climbing steep hills, considering gearing, brakes, and the effect of larger wheels. | 27th Aug 1921 | Box 180 \ M5 img036 | |
| The suitability of different chassis for armoured car tests, weighing the pros and cons of alternatives. | 1st Aug 1921 | Box 180 \ M5 img037 | |
| Letter discussing cooling issues on armoured cars following a trial up the Snake Pass. | 25th Nov 1921 | Box 180 \ M5 img038 | |
| New rear axle for armoured cars, covering cost, alternative designs, and efforts to secure an order from the War Office. | 1st Dec 1921 | Box 180 \ M5 img039 | |
| Developing new axles for standard and armoured cars, and a government tender for air-cooled cars for India. | 1st Dec 1921 | Box 180 \ M5 img040 | |
| Cooling performance of an Armoured Car for the India Office and proposals for improvement. | 1st Dec 1921 | Box 180 \ M5 img041 | |
| Proposed modifications to address car overheating and notes from a meeting with India Office representatives. | 1st Dec 1921 | Box 180 \ M5 img042 | |
| Unofficial dispatch of a new test radiator to India to address potential overheating issues. | 1st Dec 1921 | Box 180 \ M5 img043 | |
| Curing engine boiling in South Africa by fitting a throttling sleeve. | 1st Dec 1921 | Box 180 \ M5 img044 | |
| Mr. Royce's proposals for improving the cooling system of armoured cars. | 2nd Dec 1921 | Box 180 \ M5 img045 | |
| Cooling system issues and proposed modifications for armoured cars. | 6th Dec 1921 | Box 180 \ M5 img046 | |
| Testing of 19 armoured cars for the India Office, noting issues with overheating during trials. | 28th Aug 1921 | Box 180 \ M5 img047 | |
| Dispute with the India Office regarding payment, contract terms, and testing for unsatisfactory vehicles. | 28th Aug 1921 | Box 180 \ M5 img048 | |
| General condition and overhaul requirements for 10 Armoured Cars used in sandy districts in India. | 22th Jun 1927 | Box 180 \ M5 img049 | |
| Pasted addendum on the reverse of a vehicle condition report, comparing wear on a 40/50HP S.G. model. | 13th Apr 1932 | Box 180 \ M5 img050 | |
| Requesting co-operation on alterations to an evaporatively cooled Phantom I engine in an armoured car. | 13th Apr 1932 | Box 180 \ M5 img051 | |
| Difficulties and proposed alterations for an evaporatively cooled Phantom 1 engine in an armoured car. | 14th Apr 1932 | Box 180 \ M5 img052 | |
| Graph showing the hotwell pump calibration for an evaporatively cooled Phantom I engine in an armoured car. | 5th Apr 1932 | Box 180 \ M5 img053 | |
| The calibration and proposed modifications for an evaporatively cooled system on a Phantom I engine in an armoured car. | 5th Apr 1932 | Box 180 \ M5 img054 | |
| Effect of increased fan capacity on cooling and its application to honeycomb condensers. | 1st Apr 1932 | Box 180 \ M5 img055 | |
| Request for a print of a drawing for the evaporative cooling system on a Phantom 1 Armoured Car, required by the War Office. | 11th May 1933 | Box 180 \ M5 img056 | |
| Evaporative cooling system on a Phantom 1 Armoured Car. | 9th May 1933 | Box 180 \ M5 img057 | |
| Thank you note regarding the evaporative cooling system on a Phantom 1 Armoured Car. | 16th May 1933 | Box 180 \ M5 img058 | |
| Parts list and instructions for the removal of a hot well pump and fitting of a hydraulic ejector on an evaporatively-cooled armoured car. | 4th Apr 1933 | Box 180 \ M5 img059 | |
| Instructions for fitting a copper pipe between the water pump and ejector, and related tasks. | 4th Apr 1933 | Box 180 \ M5 img060 | |
| Newspaper clippings about letters from Sir Frederick Henry Royce (1927-1931) and a clarifying letter to the editor distinguishing between 'Royce Ltd' and 'Rolls-Royce Ltd'. | 30th Oct 1972 | Box 180 \ M6 img001 | |
| Letter discussing the electrical wiring configurations for longitudinal crane cross drives. | 6th Dec 1929 | Box 180 \ M6 img002 | |
| Study concluding on the need for a high-speed, torsionally stiff cross shaft and proposing a design using a large diameter drawn tube. | 6th Dec 1929 | Box 180 \ M6 img003 | |
| Letter to Mr. Bentley discussing a modified drawing for a brush holder and an alternative design for a self-adjusting brake for cranes. | 6th Dec 1929 | Box 180 \ M6 img004 | |
| Study concluding on the need for a high-speed, torsionally stiff cross shaft, proposing a design using a large diameter drawn tube. | 29th Nov 1929 | Box 180 \ M6 img005 | |
| Letter with diagrams discussing design flaws in cranes, specifically concerning the cross-shaft, motors, brakes, and oil dashpots. | 29th Nov 1929 | Box 180 \ M6 img006 | |
| Design of longitudinal brakes for Ford cranes, with a diagram. | 24th Nov 1929 | Box 180 \ M6 img007 | |
| Letter discussing design considerations for small poles, DC brush holders, and AC brush holders. | 24th Nov 1929 | Box 180 \ M6 img008 | |
| Discussion with sketches on improving the design of springs and catches for increased reliability and reduced stress. | 24th Nov 1929 | Box 180 \ M6 img009 | |
| Suggestions for a new standard design of a crab component. | 24th Nov 1929 | Box 180 \ M6 img010 | |
| Letter discussing design principles, advocating for thorough testing and careful consideration before committing to production. | 16th Dec 1929 | Box 180 \ M6 img011 | |
| Letter with hand-drawn diagrams discussing the design of A.C. and D.C. brush-holders. | 16th Dec 1929 | Box 180 \ M6 img012 | |
| Pencil sketches of various small mechanical components including a lever and block. | 1st Nov 1929 | Box 180 \ M6 img013 | |
| Letter with sketches discussing the design of a 3-phase motor brush spring for a slip ring type motor. | 1st Nov 1929 | Box 180 \ M6 img014 | |
| Letter from F.H. Royce to Mr. J.C. Bentley with a design sketch for a small D.C. electro motor. | 31th Oct 1929 | Box 180 \ M6 img015 | |
| Letter from F. H. Royce recommending changes to the nuts, bolts, and locking mechanisms used in motorcar production. | 22th Oct 1929 | Box 180 \ M6 img016 | |
| Letter to F.H. Royce regarding a repaired motor and associated costs with Messrs. Merz & McLellan. | 10th Jun 1929 | Box 180 \ M6 img017 | |
| And a sketch for a standard geared motor with a reduction gear. | 29th Mar 1929 | Box 180 \ M6 img018 | |
| Sketch and notes for a standard geared motor design. | 25th Mar 1929 | Box 180 \ M6 img019 | |
| Sketch of a standard geared motor with handwritten specifications and notes. | 25th Mar 1929 | Box 180 \ M6 img020 | |
| Letter urging a colleague to adhere to rigorous 'development overload testing' protocols before launching new models into production. | 8th Feb 1929 | Box 180 \ M6 img021 | |
| Letter discussing design standardisation, tyre improvements for sharp curves, and recent car test results. | 8th Feb 1929 | Box 180 \ M6 img022 | |
| Letter from F.H. Royce to Mr. Bentley regarding the critical importance of thoroughly testing standard units before production. | 8th Feb 1929 | Box 180 \ M6 img023 | |
| Letter discussing a report on continuous current motor design, including bearing schemes and oil retention. | 9th Jun 1928 | Box 180 \ M6 img024 | |
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