| Description | Date | Identifier | |
| Specifications for a large bore engine unit (No. U75), detailing the cylinder head, Stromberg carburettor, and jet settings. | 12th Feb 1936 | Box 20 \ 9 Scan118 | |
| Modifications and carburettor specifications for Unit E.S.M. (large bore). | 12th Feb 1936 | Box 20 \ 9 Scan119 | |
| Preliminary test results and identified faults for a Phantom III Stromberg Carburetter. | 24th Feb 1936 | Box 20 \ 9 Scan120 | |
| Adjustments to the throttle return spring and the torsional return spring on the choke. | 24th Feb 1936 | Box 20 \ 9 Scan121 | |
| Official order for received Tecalemit filters and Stromberg carburettors. | 24th Feb 1936 | Box 20 \ 9 Scan122 | |
| Letter to Zenith Carburetter Co. Ltd. about sticking accelerator pumps caused by misalignment. | 25th Feb 1936 | Box 20 \ 9 Scan123 | |
| Invoice from Zenith Carburetter Co. Ltd for By Pass Jets. | 26th Feb 1936 | Box 20 \ 9 Scan124 | |
| Invoice from Zenith Carburetter Co. for replacement Bypass Jets. | 29th Feb 1936 | Box 20 \ 9 Scan125 | |
| Request to place an official order for duplex carburetter parts for a Phantom III, received from the Zenith Carb. Co. | 2nd Mar 1936 | Box 20 \ 9 Scan126 | |
| Invoice for a Zenith carburetter and instructing the stores department to book it in. | 4th Mar 1936 | Box 20 \ 9 Scan127 | |
| The receipt of an E.E.3 carburettor from Zenith Carburetter Co. and the need to raise an official order. | 6th Mar 1936 | Box 20 \ 9 Scan128 | |
| Specification for the Stromberg Carburetter for the 20/25 model, detailing part dimensions and an initial manufacturing agreement. | 27th Mar 1936 | Box 20 \ 9 Scan129 | |
| Official order for carburettor parts received from the Zenith Carburetter Co. | 28th Mar 1936 | Box 20 \ 9 Scan130 | |
| Request to check attached drawings against parts proposed for standardization, with reference to an attached letter from Zenith Carb. Co. | 31th Mar 1936 | Box 20 \ 9 Scan131 | |
| Instruction to modify the petrol feed for the Stromberg duplex carburetters on a Phantom III. | 7th Apr 1936 | Box 20 \ 9 Scan132 | |
| Modifications to the Phantom III Stromberg carburettor and S.U. petrol pumps to resolve fuel starvation issues at high speeds. | 8th Apr 1936 | Box 20 \ 9 Scan133 | |
| Performance and pressure characteristics of petrol pumps, including free flow, back pressure, and spring ratings. | 8th Apr 1936 | Box 20 \ 9 Scan134 | |
| Graph comparing the delivery flow of a standard petrol pump against one with stronger springs under varying back pressure. | 1st Apr 1936 | Box 20 \ 9 Scan135 | |
| Stamped document from the print room. | 8th Apr 1936 | Box 20 \ 9 Scan136 | |
| Tests for fire risk and misfiring on a Stromberg carburettor for the Big Bore 20/25 HP model. | 8th Apr 1936 | Box 20 \ 9 Scan137 | |
| Flooding tests on a 25/30 HP model to provide an effective overflow drain for a Stromberg carburettor float chamber. | 8th Apr 1936 | Box 20 \ 9 Scan138 | |
| Extract from a letter by G. Summers suggesting improvements to the ignition system for wet weather performance. | 3rd Apr 1936 | Box 20 \ 9 Scan139 | |
| Schematic diagram of a float chamber vent and drainage system for a Stromberg carburetter. | 8th Apr 1936 | Box 20 \ 9 Scan140 | |
| Largely blank page with a purple 'Print Room' stamp in the bottom right corner. | 8th Apr 1936 | Box 20 \ 9 Scan141 | |
| Visit from Col. Hutchinson and a tyre offer from the Michelin Tyre Co. for armoured cars. | 22th Sep 1920 | Box 20 \ 10 Scan001 | |
| Accompanying two blueprints for 'F' Scheme 573, showing the modified position of an extra oil and petrol tank on the production chassis. | 23th Sep 1920 | Box 20 \ 10 Scan002 | |
| Confirmation of a telegram telephoned to Chichester regarding a government order and the ability to deliver parts. | 12th Oct 1920 | Box 20 \ 10 Scan003 | |
| Short note from Royce requesting models of purchasable items to be brought to the Russell Hotel. | 11th Aug 1920 | Box 20 \ 10 Scan004 | |
| Dispatch of blueprints for an armoured car's barring gear, specifically the ratchet and retaining rings. | 19th Oct 1928 | Box 20 \ 10 Scan005 | |
| Blueprints for a battery in frame for Armoured Cars. | 21th Oct 1920 | Box 20 \ 10 Scan006 | |
| Positioning of headlamps on armoured cars to clear the radiator shutters. | 22th Oct 1920 | Box 20 \ 10 Scan007 | |
| Blueprints and fitting of a hand barring gear for Armoured Cars. | 25th Oct 1920 | Box 20 \ 10 Scan008 | |
| Blueprints and the positioning of hand barring gear for armoured cars, seeking approval from the coachbuilder. | 25th Oct 1920 | Box 20 \ 10 Scan009 | |
| Proposal for a new method of driving a tyre pump on armoured cars using a flexible shaft. | 11th Oct 1920 | Box 20 \ 10 Scan010 | |
| The fit of castellated gears for the 40/50 gearbox under 'N' Scheme 622. | 26th Oct 1920 | Box 20 \ 10 Scan011 | |
| Blueprints for the wiring arrangement of a battery in an armoured car frame. | 26th Oct 1920 | Box 20 \ 10 Scan012 | |
| Proposal for an alternative hand barring gear for armoured cars, using a wire rope to swing the flywheel. | 30th Oct 1920 | Box 20 \ 10 Scan013 | |
| Modification and strengthening of towing hooks for armoured cars. | 9th Nov 1920 | Box 20 \ 10 Scan014 | |
| Letter responding to an inquiry about experimenting with corrugated sand drums for armoured cars. | 12th Nov 1920 | Box 20 \ 10 Scan015 | |
| Proposal for mounting a spare wheel carrier on an armoured car, discussing dimensions and clearances. | 2nd Dec 1920 | Box 20 \ 10 Scan016 | |
| Practicalities of carrying a spare wheel, focusing on weight distribution and potential issues with deflated tyres. | 1st Dec 1920 | Box 20 \ 10 Scan017 | |
| The hubs for 19 armoured cars destined for India, referencing 'N' Scheme 784. | 19th Mar 1921 | Box 20 \ 10 Scan018 | |
| Confirmation of a telegram from Royce to Hives regarding testing an armoured car air pump. | 4th Oct 1922 | Box 20 \ 10 Scan019 | |
| Telegram about an agreement for tall radiator caps for armoured cars and a request to send a Bijur Bendix model. | 6th Dec 1921 | Box 20 \ 10 Scan020 | |
| Meeting notes on a proposal to increase the number of experimental cars from three to six for more efficient testing. | 8th Dec 1911 | Box 20 \ 11 Scan001 | |
| Meeting minutes discussing information on competitor vehicles from Delaunay-Belleville, Napier, and Lanchester. | 14th Dec 1911 | Box 20 \ 11 Scan002 | |
| Confidential memorandum regarding the purchase and technical examination of competitor vehicles for design improvement. | 1st Jan 1908 | Box 20 \ 11 Scan003 | |
| Meeting minutes discussing trial reports on competitor vehicles including Siddeley, Sunbeam, and Daimler. | 4th Jan 1912 | Box 20 \ 11 Scan004 | |
| Confidential memo regarding the purchase of competitor cars for analysis and comparison. | 13th Dec 1911 | Box 20 \ 11 Scan005 | |
| Proposal to annually purchase and test competitor vehicles to benchmark performance and inform design improvements. | 21th Dec 1911 | Box 20 \ 11 Scan006 | |
| Extract from a note regarding the procurement of experimental cars to address noisy engine gears. | 21th Dec 1911 | Box 20 \ 11 Scan007 | |
| Confidential memo regarding the scheduled delivery of competitor chassis and the instruction to remove all identifying numbers. | 29th Dec 1911 | Box 20 \ 11 Scan008 | |
| Test run of chassis 1926 with body 1731, focusing on deep frame performance and rattles. | 20th May 1912 | Box 20 \ 11 Scan009 | |
| Chassis performance, noting the absence of 'coronation rattles', the effectiveness of the ventilation scheme, and the audibility of helical gear noise. | 20th May 1912 | Box 20 \ 11 Scan010 | |
| Technical evaluation report on vehicle components including a cotton belting clutch, deep tooth axle, and springing. | 20th May 1912 | Box 20 \ 11 Scan011 | |
| Report page detailing observations on vehicle components including suspension, engine lubrication, and wiring. | 20th May 1912 | Box 20 \ 11 Scan012 | |
| Creaking wheel noise and an overall assessment of a car's comfort. | 24th Jun 1912 | Box 20 \ 11 Scan013 | |
| Experimental run report on Chassis 1714, evaluating the performance of the axle, gears, clutch, and flywheel. | 24th Jun 1912 | Box 20 \ 11 Scan014 | |
| Vehicle component performance including vibration, an oil-tank cap, pedal plates, a radiator, and bonnet beading. | 24th Jun 1912 | Box 20 \ 11 Scan015 | |
| Vehicle component performance including side lamp brackets, a new ventilation scheme, and Mercedes type tappets. | 24th Jun 1912 | Box 20 \ 11 Scan016 | |
| Issues with new fibre high-tension wires, poor springing, and body rattles on a vehicle. | 4th Mar 1912 | Box 20 \ 11 Scan017 | |
| Test run of Experimental Chassis 1718, evaluating its underslung springs and Marshall tyre jackets. | 4th Mar 1912 | Box 20 \ 11 Scan018 | |
| The performance of various vehicle components including wheels, clutch, brake, axle, and gears. | 4th Mar 1912 | Box 20 \ 11 Scan019 | |
| Test report page detailing observations on various vehicle components. | 1st Oct 1941 | Box 20 \ 11 Scan020 | |
| New steering wheel and general observations on body noises and rattles. | 1st Oct 1941 | Box 20 \ 11 Scan021 | |
| Letter from F.H. Royce regarding the educational overhaul of a new chassis by specific personnel. | 6th Jun 1912 | Box 20 \ 11 Scan022 | |
| The inspection and overhaul of chassis from other car manufacturers for learning purposes. | 12th Jun 1912 | Box 20 \ 11 Scan023 | |
| To Mr. Royce regarding the transport of a Daimler and a Napier for experimental work. | 12th Sep 1912 | Box 20 \ 11 Scan024 | |
| Experimental test run of a 25 HP Argyll car regarding engine vibration and performance. | 9th Oct 1912 | Box 20 \ 11 Scan025 | |
| Report page detailing observations on vehicle vibration, floorboard isolation, proposed engine tests, and brake feel. | 1st Nov 1912 | Box 20 \ 11 Scan026 | |
| Road test report on a vehicle's braking, body booming at speed, bonnet noise, and suspension. | 1st Nov 1912 | Box 20 \ 11 Scan027 | |
| The testing of an improved throttle with a spring-seated valve. | 25th May 1914 | Box 20 \ 11 Scan028 | |
| Instructions regarding modifications to the experimental chassis, specifically the 2200 series. | 11th Dec 1919 | Box 20 \ 11 Scan029 | |
| Instruction regarding the 3-month lead time for experimental chassis production ahead of the standard model. | 10th Jun 1912 | Box 20 \ 11 Scan030 | |
| Internal instruction memo regarding the delivery schedule for experimental cars. | 12th Dec 1912 | Box 20 \ 11 Scan031 | |
| Departmental memo regarding motor car licences, the use of red plates, and the cancellation of registrations. | 27th Jan 1913 | Box 20 \ 11 Scan032 | |
| The cancellation of motor car licences and the use of a number plate for station work. | 28th Jan 1913 | Box 20 \ 11 Scan033 | |
| Instruction sheet for the Experimental Department detailing work on four specific vehicles. | 4th Feb 1913 | Box 20 \ 11 Scan034 | |
| Instructions regarding the status and future use of four specific experimental cars. | 1st Feb 1913 | Box 20 \ 11 Scan035 | |
| Internal instructions regarding the experimental value and potential disposal of competitor cars. | 11th Nov 1912 | Box 20 \ 11 Scan036 | |
| Mr. Hive's report on standardizing experimental cars for disposal. | 5th Feb 1913 | Box 20 \ 11 Scan037 | |
| Body specifications for experimental cars 2300 and 2301. | 19th Feb 1913 | Box 20 \ 11 Scan038 | |
| Instruction to replace cracked front cross members on experimental cars chassis 2100E and 1714. | 4th Jun 1913 | Box 20 \ 11 Scan039 | |
| Internal memorandum regarding the overhaul and sale of chassis 1718, and a handwritten reply concerning its continued use. | 16th Jul 1913 | Box 20 \ 11 Scan040 | |
| Instructions for the reassembly of Chassis 1718 with a swivel type front cross member, new springs, and experimental gearbox gears. | 23th Sep 1913 | Box 20 \ 11 Scan041 | |
| Instructions for repairs and alteration of the steering on chassis no. 1718. | 23th Jan 1914 | Box 20 \ 11 Scan042 | |
| The specifications and delivery of a car for Mr. Royce. | 29th Jul 1913 | Box 20 \ 11 Scan043 | |
| Letter confirming arrangements for an experimental car viewing at the Angel Hotel, Peterborough. | 31th Jul 1913 | Box 20 \ 11 Scan044 | |
| Wire sent about a car being prepared for Mr. Royce. | 31th Jul 1913 | Box 20 \ 11 Scan045 | |
| Telegram received by telephone from Royce regarding car and travel arrangements. | 1st Aug 1913 | Box 20 \ 11 Scan046 | |
| Forwarding a query from Mr. Lomas about the status of the Le Canadel Car. | 1st Aug 1913 | Box 20 \ 11 Scan047 | |
| Options for sourcing a new demonstration class car. | 22th Aug 1913 | Box 20 \ 11 Scan048 | |
| Suggestion and empowering the recipient to decide on Mr Platford's request. | 23th Jun 1913 | Box 20 \ 11 Scan049 | |
| The practice for handling old experimental cars, which involved replacing experimental fittings and selling them second-hand. | 2nd Sep 1913 | Box 20 \ 11 Scan050 | |
| List of parts for a 10,000-mile car test for approval by Mr Royce. | 11th Oct 1913 | Box 20 \ 11 Scan051 | |
| Whether to send a chassis to Mr. Jellinek of Mercedes and reporting a breakdown of an experimental car due to faulty connecting rods. | 7th Nov 1913 | Box 20 \ 11 Scan052 | |
| Typed memo regarding the repair of a car, including parts orders and expected timeline. | 7th Nov 1913 | Box 20 \ 11 Scan053 | |
| Request for a list of all cars in the Experimental Shop, with the handwritten response listing them. | 26th Jan 1914 | Box 20 \ 11 Scan054 | |
| Instructions regarding required parts for a 1918 chassis. | 3rd Jan 1914 | Box 20 \ 11 Scan055 | |
| Disagreement over the repair or rebuilding of Chassis 1718. | 27th Jan 1914 | Box 20 \ 11 Scan056 | |
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