| Description | Date | Identifier | |
| Requesting an experimental trial of automatic adjusting tappets for the Vulture engine, made from duralumin. | 9th Apr 1934 | Box 123 \ 3 scan0167 | |
| 2nd speed synchromesh gearbox for the Vulture, recommending 55° cams and design improvements for oil leaks. | 12th Apr 1934 | Box 123 \ 3 scan0168 | |
| Dynamometer test report on the Vulture gearbox, detailing failures and proposed modifications. | 12th Apr 1934 | Box 123 \ 3 scan0169 | |
| Attempts to cure valve spring surge and valve bounce on the Vulture Automatic Tappet Cylinder Head. | 1st Apr 1934 | Box 123 \ 3 scan0170 | |
| Summary comparing old and new camshafts regarding performance issues like valve bounce and power output. | 20th Mar 1934 | Box 123 \ 3 scan0171 | |
| Performance graph comparing an original standard camshaft with a present production camshaft for a Phantom II 8 Litre No.7 unit. | 20th Mar 1934 | Box 123 \ 3 scan0172 | |
| Delay in dispatching the 'Vulture' car due to a gearbox failure. | 5th May 1934 | Box 123 \ 3 scan0173 | |
| Request to expedite the delivery of wheels from Dunlops for Vulture dynamometer gearbox tests. | 9th May 1934 | Box 123 \ 3 scan0174 | |
| The failure of the 3rd speed driven gear in the Vulture gearbox and a suggestion for improvement. | 11th May 1934 | Box 123 \ 3 scan0175 | |
| Proposed modifications to the Vulture gearbox due to gear failure. | 14th May 1934 | Box 123 \ 3 scan0176 | |
| Blueprint of a centre side shaft bearing for a Vulture gearbox. | 14th May 1934 | Box 123 \ 3 scan0177 | |
| Specifications and an end view diagram for helical gears of the Vulture gearbox. | 30th May 1934 | Box 123 \ 3 scan0178 | |
| Technical note on gear teeth stresses and pitch line loading for various gearboxes. | 30th May 1934 | Box 123 \ 3 scan0179 | |
| Gearbox lubrication, pitch line loading, and relative load values for various models. | 30th May 1934 | Box 123 \ 3 scan0180 | |
| Preparations for radiator tests on the Vulture car at Brooklands. | 4th Jun 1934 | Box 123 \ 3 scan0181 | |
| Requesting the creation of a variable pitch fan for testing on the Vulture engine. | 21th Jun 1934 | Box 123 \ 3 scan0182 | |
| Tests carried out on fans and a Vulture radiator at Brooklands. | 3rd Jul 1934 | Box 123 \ 3 scan0183 | |
| Radiator performance results detailing water and bonnet air temperatures at various speeds. | 3rd Jul 1934 | Box 123 \ 3 scan0184 | |
| Test results comparing different cooling fans based on maintained water and bonnet air temperatures. | 3rd Jul 1934 | Box 123 \ 3 scan0185 | |
| Conclusions on radiator performance, comparing the Vulture and Spectre cars. | 3rd Jul 1934 | Box 123 \ 3 scan0186 | |
| Comparison of staggered bladed and American variable pitch fans against the standard Ph.II fan for cooling and noise. | 3rd Jul 1934 | Box 123 \ 3 scan0187 | |
| Graph showing the results of Phantom fan tests conducted at Brooklands Track. | 26th Jun 1934 | Box 123 \ 3 scan0188 | |
| Graph of Vulture radiator tests at Brooklands Track, plotting air temperature against speed. | 26th Jun 1934 | Box 123 \ 3 scan0189 | |
| Future plans for the Vulture Car. | 9th Jul 1934 | Box 123 \ 3 scan0190 | |
| Instructions for rebuilding a Vulture Gearbox with new gears, synchromesh core, and cam. | 20th Jul 1934 | Box 123 \ 3 scan0191 | |
| Confirming an agreement to delete the non-standard and non-saleable Vulture and J.III cars. | 18th Oct 1934 | Box 123 \ 3 scan0192 | |
| Sending two new blueprints for the Vulture engine's pump drives, which cancels previous schemes. | 9th Nov 1934 | Box 123 \ 3 scan0193 | |
| Experimental department report on the behaviour of the first all-helical gearbox. | 23th Nov 1934 | Box 123 \ 3 scan0194 | |
| Preliminary report on the performance of the Spectre All Helical Gearbox, detailing issues with reverse gear, noise, gear disengagement, and oil distribution. | 23th Nov 1934 | Box 123 \ 3 scan0195 | |
| Gearbox performance, detailing issues with 2nd gear disengagement and slack in the 3rd motion shaft. | 23th Nov 1934 | Box 123 \ 3 scan0196 | |
| To cancel Vulture chassis order numbers to avoid confusion with the new Vulture Aero Engine. | 3rd Dec 1934 | Box 123 \ 3 scan0197 | |
| Suggesting fitting a hardy fabric coupling and grooved pistons for the 'Vulture' car. | 4th Dec 1934 | Box 123 \ 3 scan0198 | |
| Bodywork issues with car 29-EX, including a fouling rear door and difficult-to-open luggage compartments. | 17th Dec 1934 | Box 123 \ 3 scan0199 | |
| Request to weigh the Vulture radiator for comparison with the Wraith radiator. | 19th Mar 1935 | Box 123 \ 3 scan0200 | |
| Car weight reduction through the use of smaller wheels and tyres. | 19th Mar 1935 | Box 123 \ 3 scan0201 | |
| Comparison table of wheel and tyre weights, and ground clearance for five different car models. | 14th Mar 1935 | Box 123 \ 3 scan0202 | |
| Table comparing wheel and tyre weights in pounds for various car models and tyre sizes. | 19th Mar 1935 | Box 123 \ 3 scan0203 | |
| Specification for a car with a Wraith engine fitted into a Vulture chassis. | 20th Mar 1935 | Box 123 \ 3 scan0204 | |
| The successful high-torque testing of 12 x 35 spiral bevel rear axle gears on a Vulture car. | 1st Apr 1935 | Box 123 \ 3 scan0205 | |
| General schedule of car road work tests for various vehicle components. | 1st Jun 1936 | Box 123 \ 3 scan0206 | |
| List of notes and action items for various vehicle projects and tests. | 14th Nov 1935 | Box 123 \ 3 scan0207 | |
| Listing cars and associated jobs waiting for the shop. | 14th Nov 1935 | Box 123 \ 3 scan0208 | |
| The failure of a propeller shaft universal joint on the Vulture car and the design of a replacement. | 30th May 1936 | Box 123 \ 3 scan0209 | |
| Close-up photograph of a metal component with a forked clevis joint on the end of a shaft. | 5th Aug 1936 | Box 123 \ 3 scan0210 | |
| Instructing to cease production of parts for the Vulture Car, which has been condemned as unsafe and is to be scrapped. | 5th Aug 1936 | Box 123 \ 3 scan0211 | |
| Agreeing to produce a new 20 HP experimental chassis, number 18-G4. | 4th Mar 1930 | Box 123 \ 4 scan0001 | |
| Request for a list of chassis numbers for experimental cars to aid with correspondence filing. | 7th May 1930 | Box 123 \ 4 scan0002 | |
| Listing the cars currently in use by the Experimental Department. | 8th May 1930 | Box 123 \ 4 scan0003 | |
| Cover note for a letter from the County Surveyor regarding road damage, suggesting the route be given a rest. | 10th May 1930 | Box 123 \ 4 scan0004 | |
| Letter from the County Surveyor regarding complaints of dangerous speeding during car testing. | 8th May 1930 | Box 123 \ 4 scan0005 | |
| Disposal and repair of a Chrysler car. | 14th May 1930 | Box 123 \ 4 scan0006 | |
| Confirming the sale arrangement for a 20 HP Experimental Car post-testing and discussing the body's condition for coachbuilders. | 14th May 1930 | Box 123 \ 4 scan0007 | |
| Preparation of the 20 HP Experimental car, 14-G4, for sale. | 15th May 1930 | Box 123 \ 4 scan0008 | |
| Development of a silent (helical) three-speed gearbox on experimental car 14-EX and the number of experimental cars in use. | 1st Jul 1930 | Box 123 \ 4 scan0009 | |
| Requesting the use of a covered Experimental car for a weekend. | 2nd Jul 1930 | Box 123 \ 4 scan0010 | |
| The renewal of motor car licenses for vehicles 24-EX and 26-EX. | 15th Sep 1930 | Box 123 \ 4 scan0011 | |
| The renewal of motor car licenses for vehicles 24-EX and 26-EX. | 16th Sep 1930 | Box 123 \ 4 scan0012 | |
| Urgent inquiry regarding the maximum number of drivers or officials on the road for testing or other company purposes. | 7th Nov 1930 | Box 123 \ 4 scan0013 | |
| Number of experimental cars on the road and requesting figures for production test cars. | 8th Nov 1930 | Box 123 \ 4 scan0014 | |
| Car No.9-EX, stating it is surplus to requirements and should not be sent to the Transport Dept. | 20th Jan 1931 | Box 123 \ 4 scan0015 | |
| Proposing the scrapping of an old experimental car, 9-EX, and salvaging its useful parts. | 23th Jan 1931 | Box 123 \ 4 scan0016 | |
| Decision to dismantle Experimental Car 9-EX, salvage useful parts, and scrap the remainder. | 26th Jan 1931 | Box 123 \ 4 scan0017 | |
| Potential dismantling of experimental car 14-EX due to its non-standard nature. | 27th Jan 1931 | Box 123 \ 4 scan0018 | |
| Continued use of the 14-EX experimental car for gearbox experiments. | 28th Jan 1931 | Box 123 \ 4 scan0019 | |
| Inquiry regarding the potential sale of a demonstration or experimental 20/25 HP long chassis to a Captain W.A. Powell. | 25th Feb 1931 | Box 123 \ 4 scan0020 | |
| The disposal of experimental 20/25 HP cars. | 26th Feb 1931 | Box 123 \ 4 scan0021 | |
| Request from Capt. Forsyth to borrow a car over the Easter period. | 18th Mar 1931 | Box 123 \ 4 scan0022 | |
| Arrangement of a loaner car for Captain Forsyth for Easter. | 19th Mar 1931 | Box 123 \ 4 scan0023 | |
| Potential release and sale of several experimental Phantom II cars to reduce rolling stock. | 25th Mar 1931 | Box 123 \ 4 scan0024 | |
| Insurance arrangements for a car to be lent to Capt. Forsyth during the Easter holidays. | 31th Mar 1931 | Box 123 \ 4 scan0025 | |
| Note confirming the loan of the 'Aviation Car' to Captain Forsyth and the arrangement of the related insurance. | 1st Apr 1931 | Box 123 \ 4 scan0026 | |
| Disposal of a second-hand experimental car and repurposing an American experimental car for demonstration. | 2nd Apr 1931 | Box 123 \ 4 scan0027 | |
| Delays with the Phantom I car 110-DC due to issues with springs, and the use of experimental cars 25-EX and 24-EX. | 14th Apr 1931 | Box 123 \ 4 scan0028 | |
| The private use of experimental cars, listing individuals involved. | 7th May 1931 | Box 123 \ 4 scan0029 | |
| Policy on running experimental cars and the value of having officials test them. | 9th May 1931 | Box 123 \ 4 scan0030 | |
| Benefit of allowing personnel to run company cars. | 9th May 1931 | Box 123 \ 4 scan0031 | |
| Typed memo requesting an experimental car for personal use during the holidays. | 22th May 1931 | Box 123 \ 4 scan0032 | |
| Follow-up communication regarding the disposal of two experimental 20/25 HP cars. | 27th May 1931 | Box 123 \ 4 scan0033 | |
| Advising that due to a programme change, cars previously thought to be for disposal must now be retained. | 28th May 1931 | Box 123 \ 4 scan0034 | |
| Provision of a left-handed experimental car for the Paris Show. | 29th May 1931 | Box 123 \ 4 scan0035 | |
| Suitability and condition of two experimental left-hand drive cars, 24-EX and 25-EX, for Paris Trials. | 29th May 1931 | Box 123 \ 4 scan0036 | |
| Repair costs for chassis 24-EX and its potential use as the Paris Trials car. | 16th Jun 1931 | Box 123 \ 4 scan0037 | |
| Fitting a new French body to chassis 24-EX for the Paris Show. | 17th Jun 1931 | Box 123 \ 4 scan0038 | |
| Sending coachbuilder's drawings for chassis 24-EX, clarifying spare wheel carrier options. | 18th Jun 1931 | Box 123 \ 4 scan0039 | |
| Questioning further expenditure on the Maybach gear change experiment for car 14-EX. | 7th Jul 1931 | Box 123 \ 4 scan0040 | |
| Status and non-standard configuration of experimental car 14-EX, which has a separate gearbox. | 8th Jul 1931 | Box 123 \ 4 scan0041 | |
| Loan of a car for a holiday period. | 16th Jul 1931 | Box 123 \ 4 scan0042 | |
| Approval for the use of an experimental car during the Works holiday week. | 17th Jul 1931 | Box 123 \ 4 scan0043 | |
| Features of car 18-EX, its proposed transfer to the Repair Dept., and a recommendation for its sale. | 10th Sep 1931 | Box 123 \ 4 scan0044 | |
| The disposal of car 18-GX and querying the reasons for its upcoming visit to the Repair Department. | 11th Sep 1931 | Box 123 \ 4 scan0045 | |
| Taking over car 18-EX for sale. | 11th Sep 1931 | Box 123 \ 4 scan0046 | |
| Reason for sending car 18-EX to the Repair Department and conditions for its delivery to London. | 14th Sep 1931 | Box 123 \ 4 scan0047 | |
| Instructions to prepare Chassis No.18-EX for sale, including the removal of experimental features. | 14th Sep 1931 | Box 123 \ 4 scan0048 | |
| Requesting disposal instructions for the bodies from three experimental cars, chassis 9-EX, 23-EX, and 24-EX. | 3rd Nov 1931 | Box 123 \ 4 scan0049 | |
| The disposal of bodies from chassis 9-EX and 23-EX, and the repair and reuse of the body from 24-EX. | 4th Nov 1931 | Box 123 \ 4 scan0050 | |
| Proposal for coachwork expenditure involving repairing the 24-EX body and mounting it on the 19-EX chassis with modifications. | 10th Nov 1931 | Box 123 \ 4 scan0051 | |
| Strategy of co-operating with external coachbuilders for experimental cars. | 10th Nov 1932 | Box 123 \ 4 scan0052 | |
| Employment of a coachbuilder in the experimental department and the challenges involved. | 14th Nov 1932 | Box 123 \ 4 scan0053 | |
| The disposal of second-hand bodies from chassis 9-EX and 23-EX. | 31th Dec 1931 | Box 123 \ 4 scan0054 | |
| Disposal and status of various experimental cars and components. | 18th Jan 1932 | Box 123 \ 4 scan0055 | |
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