| Description | Date | Identifier | |
| Blank document page with a purple ink 'Print Room' stamp in the bottom right corner. | 1st Apr 1927 | Box 40 \ 3 Scan066 | |
| Advising that the Grav-Vac Syndicate will be submitting a modified apparatus to overcome previously experienced difficulties. | 25th Apr 1927 | Box 40 \ 3 Scan067 | |
| Letter discussing Cadillac's adoption of a vacuum pump for their fuel feed system and a wider trend away from using intake vacuum for accessories. | 16th Sep 1927 | Box 40 \ 3 Scan068 | |
| Recommendation to add a 30 cubic inch reservoir between the vacuum pump and the vacuum tank. | 16th Sep 1927 | Box 40 \ 3 Scan069 | |
| Technical drawing of a Cadillac pressure feed pump and a valveless vacuum pump. | 16th Sep 1927 | Box 40 \ 3 Scan070 | |
| Letter to RR America Inc. concerning a report on Vacuum Feed and the use of an engine-driven vacuum pump. | 19th Oct 1927 | Box 40 \ 3 Scan071 | |
| Tests on a vacuum feed system, specifically concerning engine idling and cylinder performance. | 19th Oct 1927 | Box 40 \ 3 Scan072 | |
| Road tests analyzing engine performance issues related to idling, mixture richness, and vacuum connections. | 19th Oct 1927 | Box 40 \ 3 Scan073 | |
| Continuation page of a document condemning a permanent restriction in a piston valve due to its inefficiency in the vacuum system. | 8th Jun 1928 | Box 40 \ 3 Scan074 | |
| Westinghouse Vacuum Booster (Dewandre System) and concerns regarding its installation on cars by outside agencies. | 8th Jun 1928 | Box 40 \ 3 Scan075 | |
| Trial and function of a Stewart-Warner 'Booster' and vacuum pump for fuel feed systems. | 25th Jun 1928 | Box 40 \ 3 Scan076 | |
| The functionality and installation of a standard A.C. vacuum fuel pump. | 26th Jun 1928 | Box 40 \ 3 Scan077 | |
| Describing the construction and operation of a Grav-Vac vacuum petrol feed tank, comparing it to the Autovac. | 26th Jun 1928 | Box 40 \ 3 Scan078 | |
| Comparison of the performance and limitations between a Grav-vac and an Autovac fuel delivery system. | 30th Oct 1928 | Box 40 \ 3 Scan079 | |
| Graph comparing petrol delivery at full throttle for Autovac and Grav-vac fuel systems on a 40/50HP engine. | 30th Oct 1928 | Box 40 \ 3 Scan080 | |
| Blank document page with a red ink stamp from the Derby office. | 23th Jun 1928 | Box 40 \ 3 Scan081 | |
| Graph comparing petrol delivery for Autovac and Grav-vac systems against induction pipe depression. | 22th Nov 1923 | Box 40 \ 3 Scan082 | |
| Blank page with a red 'PRINT ROOM, DERBY' stamp. | 23th Jun 1928 | Box 40 \ 3 Scan083 | |
| Blueprint diagram showing a cutaway view of a Grav-Vac Fuel Tank with labelled components. | 9th Nov 1920 | Box 40 \ 3 Scan084 | |
| Mostly blank document page featuring a red rectangular date stamp. | 23th Jun 1928 | Box 40 \ 3 Scan085 | |
| The testing of a 'Grav-vac' vacuum petrol feed tank, detailing performance issues with its valve mechanism compared to the standard Autovac. | 10th Jul 1928 | Box 40 \ 3 Scan086 | |
| Required alterations to a valve mechanism and an offer to test corrected samples. | 26th Jun 1928 | Box 40 \ 3 Scan087 | |
| Report comparing the Grav-vac vacuum feed tank with the Autovac, detailing operational principles and faults. | 26th Jun 1928 | Box 40 \ 3 Scan088 | |
| Letter from the American branch regarding a Stewart Warner vacuum pump to replace the AC fuel pump. | 29th Oct 1928 | Box 40 \ 3 Scan089 | |
| Blueprint for a vacuum pump installation with a straight lever. | 17th Jul 1928 | Box 40 \ 3 Scan090 | |
| Technical drawing of a vacuum pump bent lever installation. | 18th Jul 1928 | Box 40 \ 3 Scan091 | |
| Letter from the American branch to Derby discussing new fuel system developments by St. Warner. | 11th Feb 1929 | Box 40 \ 3 Scan092 | |
| Letter discussing the pros and cons of various fuel pump and delivery systems. | 11th Feb 1929 | Box 40 \ 3 Scan093 | |
| Letter from Rolls Royce of America discussing developments in fuel feed systems, specifically boosters and a new vacuum tank. | 11th Feb 1929 | Box 40 \ 3 Scan094 | |
| Letter discussing fuel feed systems, including vacuum pumps and boosters. | 5th Feb 1929 | Box 40 \ 3 Scan095 | |
| Page 2 of a letter from Maurice Olley discussing vacuum levels, a booster test, and an intake manifold leak. | 30th Jan 1929 | Box 40 \ 3 Scan096 | |
| Letter regarding the performance of a vacuum booster on Chassis 123-RP and a recommendation for its standard fitment. | 30th Jan 1929 | Box 40 \ 3 Scan097 | |
| Performance characteristics graph of a Stewart-Warner vacuum tank and various boosters. | 26th Sep 1929 | Box 40 \ 3 Scan098 | |
| Complaints from the U.S.A. regarding loose wire wheel hubs and potential manufacturing solutions. | 13th Dec 1921 | Box 40 \ 3 Scan099 | |
| Choice between R.W. (Rudge-Whitworth) and Dunlop wire wheels for the Goshawk and 40/50 models. | 1st Jul 1922 | Box 40 \ 3 Scan100 | |
| Relaying a suggestion from Australia to fit thrust races to wheels to combat side strain from rutted roads. | 8th Sep 1922 | Box 40 \ 3 Scan101 | |
| Querying the comparative weights of Dunlop and Rudge-Whitworth front axle hub components for the New Phantom. | 9th Sep 1925 | Box 40 \ 3 Scan102 | |
| Proposal for reducing the width of standard wire wheels for the Phantom model by modifying artillery wheel hubs. | 1st Oct 1927 | Box 40 \ 3 Scan103 | |
| Proposed narrower wire wheels for the 20 HP chassis, including alterations to the hub design. | 18th Oct 1927 | Box 40 \ 3 Scan104 | |
| Standardisation of chassis parts, specifically for shorter and lighter wheels and hubs to improve the design. | 2nd May 1928 | Box 40 \ 3 Scan105 | |
| Standardisation form for a new chassis part, detailing fitting, testing, and cost implications. | 2nd Jul 1923 | Box 40 \ 3 Scan106 | |
| Modifying the wording of the label for Bentley wheel hubs following suggestions from the Experimental Department. | 6th Feb 1934 | Box 40 \ 3 Scan107 | |
| Instructions for the maintenance and tightening of centre-lock detachable wire wheels. | 4th Apr 1934 | Box 40 \ 3 Scan108 | |
| Request to make two adaptors for Phantom II hubs to determine the centre of gravity of complete cars. | 4th Apr 1934 | Box 40 \ 3 Scan109 | |
| Article from 'The Autocar' magazine describing the Autovac petrol feed system. | 5th Jul 1919 | Box 40 \ 4 Scan001 | |
| Page from 'The Autocar' magazine dated 1919, discussing garages, motor fuel and featuring a Talbot car. | 5th Jul 1919 | Box 40 \ 4 Scan002 | |
| Article from 'The Autocar' magazine detailing the operation of the Autovac vacuum petrol feed tank system. | 5th Jul 1919 | Box 40 \ 4 Scan003 | |
| Summary of a Government Committee report on the potential use of alcohol as a motor fuel, covering supply, production, and usage. | 5th Jul 1919 | Box 40 \ 4 Scan004 | |
| Request to obtain an Auto-Vac Petrol Feed System from Arundel & Co. for experimental purposes. | 23th Apr 1919 | Box 40 \ 4 Scan005 | |
| Advantages and potential issues of a vacuum feed system for petrol supply. | 24th Apr 1919 | Box 40 \ 4 Scan006 | |
| The improvements and drawbacks of the Auto Vac vacuum feed system compared to the pressure system. | 24th Apr 1919 | Box 40 \ 4 Scan007 | |
| Letter from Arundel & Co. offering a trial of their new patented 'Autovac' Petrol Feed system. | 21th Oct 1919 | Box 40 \ 4 Scan008 | |
| Letter to Arundal & Co. regarding an Autovac feed arrangement, declining to test a special size but requesting details on an improved scheme. | 3rd Nov 1919 | Box 40 \ 4 Scan009 | |
| Letter from Arundel & Co. offering a newly re-designed Autovac for testing purposes. | 5th Nov 1919 | Box 40 \ 4 Scan010 | |
| Letter to Arundel & Co. requesting a free-of-charge Auto-vac for testing purposes. | 24th Nov 1919 | Box 40 \ 4 Scan011 | |
| Letter from Arundel & Co. reporting a leaking float in a new Autovac unit. | 28th Nov 1919 | Box 40 \ 4 Scan012 | |
| Letter from Arundel & Co. confirming a new Autovac apparatus is ready for delivery and requesting to arrange a meeting. | 17th Dec 1919 | Box 40 \ 4 Scan013 | |
| Letter from Arundel & Co. regarding a despatched Autovac and an incorrectly sent invoice. | 25th Nov 1919 | Box 40 \ 4 Scan014 | |
| Letter from a supplier responding to a complaint about a new Autovac petrol feed system and offering to send an expert to investigate. | 1st Dec 1919 | Box 40 \ 4 Scan015 | |
| Article from 'THE AUTOCAR' detailing constructional alterations and improvements to the Autovac fuel system. | 5th Jun 1920 | Box 40 \ 4 Scan016 | |
| Page from 'The Autocar' magazine, featuring various news snippets and a photograph from the motoring world. | 5th Jun 1920 | Box 40 \ 4 Scan017 | |
| Test report on the limitations of the vacuum petrol supply system on a 40/50 chassis. | 22th Nov 1920 | Box 40 \ 4 Scan018 | |
| The limitations of a vacuum petrol supply system at full throttle. | 22th Nov 1920 | Box 40 \ 4 Scan019 | |
| 'Autovac' suitable for a 'Goshawk II' chassis, in accordance with Mr. Royce's wishes. | 14th Jun 1921 | Box 40 \ 4 Scan020 | |
| From Hs. to E. listing car parts despatched to W.W. | 1st Jul 1921 | Box 40 \ 4 Scan021 | |
| Letter to the Auto-Vac Manufacturing Co. Ltd. requesting particulars of tank sizes suitable for a smaller car chassis. | 1st Jul 1921 | Box 40 \ 4 Scan022 | |
| Letter concerning a patented scheme by Monier Grandjean Minguet to improve the vacuum on the Autovac system. | 1st Jun 1921 | Box 40 \ 4 Scan023 | |
| Letter from the Autovac Manufacturing Co. Ltd. concerning the Autovac Tank and arranging a visit. | 2nd Jul 1921 | Box 40 \ 4 Scan024 | |
| Requesting to urge action on the Goshawk 11 Autovac, as per Mr. Royce's instruction. | 23th Jun 1921 | Box 40 \ 4 Scan025 | |
| Discussions with the Autovac Company regarding petrol supply systems for the Goshawk 11 and a large car. | 5th Jul 1921 | Box 40 \ 4 Scan026 | |
| Advertisement reprint from 'The Motor' magazine for the Autovac Petrol Feed System. | 26th Jan 1921 | Box 40 \ 4 Scan027 | |
| Advertisement explaining the function of the Autovac Patent Self-Draining Float. | 14th Jul 1921 | Box 40 \ 4 Scan028 | |
| Proposal to trial an Autovac fuel system on the Goshawk 11 engine. | 14th Jul 1921 | Box 40 \ 4 Scan029 | |
| Letter from Autovac Manufacturing Co. Ltd. concerning the supply of Autovacs and associated fittings. | 12th Jul 1921 | Box 40 \ 4 Scan030 | |
| Test report from Autovac Manufacturing Company comparing venturi performance with and without exhaust coupling. | 15th Aug 1921 | Box 40 \ 4 Scan031 | |
| The Goshawk II 'Autovac', attaching a letter and blueprint from the Autovac Manufacturing Company. | 15th Aug 1921 | Box 40 \ 4 Scan032 | |
| Letter from Autovac Mfg. Co. Ltd. detailing test results for Autovac and Venturi fittings for a Goshawk II engine. | 12th Aug 1921 | Box 40 \ 4 Scan033 | |
| Letter from Autovac Mnfg. Co. Limited discussing the performance of a Venturi with a Non Return Valve. | 22th Aug 1921 | Box 40 \ 4 Scan034 | |
| Letter to Autovac Mfg. Co. Ltd. requesting clarification on the specifications of received Autovac tanks and components. | 22th Aug 1921 | Box 40 \ 4 Scan035 | |
| Letter from Autovac Manufacturing Co. Ltd. responding to a query about the A.V. 31 type Autovac. | 25th Aug 1921 | Box 40 \ 4 Scan036 | |
| Autovac type AV.341 of a specific size for the 'Goshawk II'. | 9th Sep 1921 | Box 40 \ 4 Scan037 | |
| Responding to a request for an Autovac for the Goshawk 11 car, advising it is currently fitted to a car that will be brought for examination. | 1st Sep 1921 | Box 40 \ 4 Scan038 | |
| Instructing the Stores to despatch an Auto-Vac to a customer. | 12th Sep 1921 | Box 40 \ 4 Scan039 | |
| Auto-Vac Tank mechanism, recommending a tank size of at least one gallon. | 12th Sep 1921 | Box 40 \ 4 Scan040 | |
| Sectional view diagram of an 'Autovac' reserve petrol tank. | 5th Nov 1921 | Box 40 \ 4 Scan041 | |
| Extract discussing drawings for Goshawk and Swallow engine designs. | 5th Nov 1921 | Box 40 \ 4 Scan042 | |
| Evaluation of a Weymann vacuum tank from Paris as a potential replacement for the Autovac. | 6th Jan 1922 | Box 40 \ 4 Scan043 | |
| Letter from Autovac Manufacturing Co. regarding a new type of Autovac with a Vacuum Intensifier sent for testing. | 4th Apr 1922 | Box 40 \ 4 Scan044 | |
| Leaflet for the patent 'Autovac' Petrol Feed System. | 4th Apr 1922 | Box 40 \ 4 Scan045 | |
| Diagram and explanation of the Autovac petrol-feed system. | 4th Apr 1922 | Box 40 \ 4 Scan046 | |
| Promotional leaflet explaining the step-by-step operation of the Autovac Petrol Feed System. | 6th May 1922 | Box 40 \ 4 Scan047 | |
| Design modifications for the Goshawk 11 Autovac tank. | 6th May 1922 | Box 40 \ 4 Scan048 | |
| New spring design for the Autovac tank valve, including material options. | 30th Jun 1922 | Box 40 \ 4 Scan049 | |
| Installation of a larger vacuum tank for a 40/50 model by cutting through the dashboard. | 19th Sep 1922 | Box 40 \ 4 Scan050 | |
| Query regarding the flimsy design of the nipple and brass union for Autovac connections. | 21th Dec 1922 | Box 40 \ 4 Scan051 | |
| Letter requesting dynamometer curves for 40/50 cars and discussing the merits of the Autovac fuel system over a pressure feed system. | 31th Jan 1923 | Box 40 \ 4 Scan052 | |
| The adoption of the Autovac system, throttle casting heat treatment, magneto drive, and ignition switches. | 31th Jan 1923 | Box 40 \ 4 Scan053 | |
| Letter discussing a proposed separate switch to test dual ignition systems. | 6th Mar 1923 | Box 40 \ 4 Scan054 | |
| Effects of high altitude on Autovac fuel systems and engine performance. | 6th Mar 1923 | Box 40 \ 4 Scan055 | |
| Table of 3rd gear readings for Autovac tests with a 15/52 axle, showing engine RPM against MPH. | 18th Apr 1923 | Box 40 \ 4 Scan056 | |
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