| Description | Date | Identifier | |
| Design and prototyping of a new end filler for the petrol tank on the 40/50 HP chassis. | 30th Jan 1920 | Box 42 \ 4 Scan073 | |
| Note regarding particulars for an air vent pipe connecting the petrol pipe to the filler tube. | 30th Jan 1920 | Box 42 \ 4 Scan074 | |
| Design modifications to the 40/50 HP chassis petrol tank, including the strainer, vent pipe, and reserve fuel device. | 3rd Feb 1920 | Box 42 \ 4 Scan075 | |
| Extract discussing modifications and component choices for a trials car destined for America. | 4th Feb 1920 | Box 42 \ 4 Scan076 | |
| Petrol tank design for the American chassis. | 27th May 1920 | Box 42 \ 4 Scan077 | |
| List of parts and modifications for a car destined for West Wittering. | 19th Apr 1920 | Box 42 \ 4 Scan078 | |
| Delay and listing new parts being fitted to the replacement 6.EX car. | 28th May 1920 | Box 42 \ 4 Scan079 | |
| List of experimental parts fitted to chassis 6.EX. | 22th Jun 1920 | Box 42 \ 4 Scan080 | |
| List of experimental parts fitted to the 6.EX car. | 28th Jun 1920 | Box 42 \ 4 Scan081 | |
| Instructions for altering dimensions on the side filler for the petrol tank of a 40/50 chassis. | 1st Jul 1920 | Box 42 \ 4 Scan082 | |
| Listing parts fitted to experimental cars 4.EX and 6.EX. | 1st Jul 1920 | Box 42 \ 4 Scan083 | |
| Issues with petrol tanks with side fillers, focusing on venting problems and cap design. | 20th Jul 1920 | Box 42 \ 4 Scan084 | |
| Ordering soft red fibre washers and standardising the petrol filter and tank filler. | 20th Jul 1920 | Box 42 \ 4 Scan085 | |
| The design of a petrol tank side filler and sending a model distribution board. | 22th Jul 1920 | Box 42 \ 4 Scan086 | |
| Clarifying the positioning of the side filler on American versus English petrol tanks. | 23th Jul 1920 | Box 42 \ 4 Scan087 | |
| Modifications for a side petrol filter on the 6EX model, including a new vent pipe design and other improvements. | 24th Jul 1926 | Box 42 \ 4 Scan088 | |
| Continuation of a memo regarding modifications to a main casting and petrol tank. | 23th Jul 1920 | Box 42 \ 4 Scan089 | |
| Design improvements to the petrol tank side filler, including a new lock and nut. | 24th Jul 1920 | Box 42 \ 4 Scan090 | |
| Modifications for petrol tanks, gauges, and reserve devices, including a new double level device. | 31th Jul 1920 | Box 42 \ 4 Scan091 | |
| The design of a fuel tank, including a plug for manual gauging and the search for a suitable petrol level indicator. | 31th Jul 1920 | Box 42 \ 4 Scan092 | |
| Design points for a petrol tank side filler and vent pipe, with sketches. | 5th Aug 1920 | Box 42 \ 4 Scan093 | |
| Hand-drawn sketch of a lever and cam mechanism. | 5th Aug 1920 | Box 42 \ 4 Scan094 | |
| Design specifications and sketches for a filler cap, handle, and strainer assembly. | 5th Aug 1920 | Box 42 \ 4 Scan095 | |
| Note specifying the filler position for left-hand and right-hand steering cars. | 5th Aug 1920 | Box 42 \ 4 Scan096 | |
| Cablegram from Claude Johnson outlining decisions on the starter motor, petrol tank, dynamo, and magneto for the American Springfield chassis. | 6th Aug 1920 | Box 42 \ 4 Scan097 | |
| Modifications to a petrol tank, including the level indicator and reserve fuel device. | 17th Aug 1920 | Box 42 \ 4 Scan098 | |
| Suggested modifications for a drain fitting, valve stop, and piping related to a luggage grid. | 17th Aug 1920 | Box 42 \ 4 Scan099 | |
| Blueprints for a modified petrol tank, specifically schemes 540 and 538, sent for final approval. | 19th Aug 1920 | Box 42 \ 4 Scan100 | |
| Issues and proposed modifications for a petrol tank side filler, cap, and ventilation system. | 23th Aug 1920 | Box 42 \ 4 Scan101 | |
| Improvements to a funnel, petrol gauge, and luggage carrier fittings. | 23th Aug 1920 | Box 42 \ 4 Scan102 | |
| Design requirements for a side petrol filler on a 40/50 HP chassis. | 27th Aug 1920 | Box 42 \ 4 Scan103 | |
| Instructions regarding component modifications for testing and standardisation, with feedback from Mr. Royce. | 27th Aug 1920 | Box 42 \ 4 Scan104 | |
| Extract from communications discussing the design and production of a petrol tank for the American market. | 27th Aug 1920 | Box 42 \ 4 Scan105 | |
| The arrangements and modifications for an experimental car being sent to the U.S.A. for winter testing. | 1st Nov 1920 | Box 42 \ 4 Scan106 | |
| Work on 6.EX Car at Park Wards, including a list of new parts to be installed. | 13th Nov 1920 | Box 42 \ 4 Scan107 | |
| Extract from a report on a visit to America, discussing petrol level indicators and wiring arrangements. | 15th Nov 1920 | Box 42 \ 4 Scan108 | |
| Experimental parts fitted to chassis 4.EX. | 12th Dec 1920 | Box 42 \ 4 Scan109 | |
| The unsatisfactory petrol tank side filling scheme and the resulting material hold-up for the 'R' series. | 3rd Feb 1921 | Box 42 \ 4 Scan110 | |
| The performance issues of a side filler for a petrol tank on the 4 EX Car, specifically its slow filling rate at American gasoline stations, and potential modifications. | 10th Feb 1921 | Box 42 \ 4 Scan111 | |
| Potential improvements and material holds for the 'R' Series. | 11th Feb 1921 | Box 42 \ 4 Scan112 | |
| The removal of the inlet gauze from petrol tank side fillers for Goshawk and 40/50 HP models. | 21th Aug 1922 | Box 42 \ 4 Scan113 | |
| Cover note for a completed standardisation sheet regarding a side filler for a petrol tank. | 6th Sep 1922 | Box 42 \ 4 Scan114 | |
| Standardisation of a side filler for the petrol tank. | 11th Aug 1922 | Box 42 \ 4 Scan115 | |
| Proposal to add a side filler to the 40/50 chassis petrol tank. | 11th Aug 1922 | Box 42 \ 4 Scan116 | |
| Solutions for owners losing petrol tank filler caps, proposing either a chain or a cable. | 27th Sep 1923 | Box 42 \ 4 Scan117 | |
| Forwarding a letter regarding the 'Eagle' VIII Circulating Pump, with instructions to reply directly to the Ministry. | 24th Jan 1920 | Box 42 \ 4 Scan118 | |
| Inquiry from the Air Ministry regarding experiments with Tucks Patent Packing in the Eagle VIII circulating pump. | 22th Jan 1920 | Box 42 \ 4 Scan119 | |
| Letter to the Air Ministry regarding testing Tucks Patent Packing for the 'Eagle' VIII Circulating Pump. | 4th Feb 1920 | Box 42 \ 4 Scan120 | |
| Letter from the Air Ministry regarding the 'Eagle' VIII Circulating Pump and Tucks patent Packing. | 9th Feb 1920 | Box 42 \ 4 Scan121 | |
| Special Dunlop wheels with loose rims suitable for American tyres, for chassis intended for America. | 15th May 1919 | Box 42 \ 4 Scan122 | |
| To Mr. Hives requesting a report on a sample American Wheel received from the Dunlop Rubber Co Ltd. | 23th Sep 1919 | Box 42 \ 4 Scan123 | |
| Difficulties and risks associated with fitting wooden wheels. | 23th Sep 1919 | Box 42 \ 4 Scan124 | |
| The difficulty of persuading customers to choose wire wheels over wooden wheels. | 20th Sep 1919 | Box 42 \ 4 Scan125 | |
| Letter regarding customer dissatisfaction with standard wire wheels in the American market and a recommendation to supply wooden wheels. | 2nd Sep 1919 | Box 42 \ 4 Scan126 | |
| With a sketch discussing the damage to wire wheel spokes on imported cars due to the design of street gutters. | 16th Sep 1919 | Box 42 \ 4 Scan127 | |
| Supply of parts for wood wheels and the preference for wire wheels. | 16th Sep 1919 | Box 42 \ 4 Scan128 | |
| Preventing car theft and a comparison of different wheel types, including wire, disc, and wood. | 9th Dec 1919 | Box 42 \ 4 Scan129 | |
| Various components including temperature indicators, hubs, and fuel tank gauzes. | 2nd Dec 1919 | Box 42 \ 4 Scan130 | |
| List of parts, specifically rims and tyres, sent from the United States for experimental work. | 30th Jan 1920 | Box 42 \ 4 Scan131 | |
| Letter requesting an urgent decision on the standardization of wheel rims for the US market. | 4th Feb 1920 | Box 42 \ 4 Scan132 | |
| Letter from the New York office requesting an urgent cabled decision on the choice of wire wheel rims. | 10th Jan 1920 | Box 42 \ 4 Scan133 | |
| Supply of 450 wire wheels and the testing of rims from Firestone, Goodyear, and Standweld. | 10th Jan 1920 | Box 42 \ 4 Scan134 | |
| The failure of Firestone rims during tests, the subsequent cancellation of an order, and arguments for reconsidering the decision. | 25th Jun 1920 | Box 42 \ 4 Scan135 | |
| Comparison of different types of wheel rims including Firestone, Goodyear, and Dunlop. | 25th Jun 1920 | Box 42 \ 4 Scan136 | |
| Tyre and rim safety, comparing Goodyear and Firestone designs and the risk of components detaching. | 25th Jun 1920 | Box 42 \ 4 Scan137 | |
| Various tyre and rim suppliers, including Dunlop, Goodyear, Rudge-Whitworth, and Firestone. | 25th Jun 1920 | Box 42 \ 4 Scan138 | |
| Addition of a device to a Firestone rim to improve the safety and construction of a wire wheel. | 25th Jun 1920 | Box 42 \ 4 Scan139 | |
| Sketches and notes for a suggested locking bolt for a Firestone spring ring. | 5th Jun 1920 | Box 42 \ 4 Scan140 | |
| Letter from Firestone discussing the potential manufacture of a special locking ring device for rims. | 16th Jun 1920 | Box 42 \ 4 Scan141 | |
| Letter to Mr. Dever Waters comparing the design and safety of the Stanwell split side ring with the Goodyear ring. | 16th Jun 1920 | Box 42 \ 4 Scan142 | |
| Letter from Pierce-Arrow Motor Car Company regarding wheel rim design, fractures, and associated manufacturing issues. | 9th Jun 1920 | Box 42 \ 4 Scan143 | |
| Letter from the Chief Engineer of Pierce-Arrow Motor Car Company regarding the weakness of wheel rims and the use of Firestone rims. | 9th Jun 1920 | Box 42 \ 4 Scan144 | |
| Comparison sketch of Firestone and Goodyear wheel rim sections with handwritten notes. | 9th Jun 1920 | Box 42 \ 4 Scan145 | |
| List of passenger cars using Firestone rims for the year 1920. | 1st Jan 1920 | Box 42 \ 4 Scan146 | |
| Whether to supply forgings for Michelin disc wheels to the U.S.A for experimental work. | 11th Jun 1920 | Box 42 \ 4 Scan147 | |
| The cessation of Michelin wheel forging production due to accidents with soft bead clincher tyres. | 25th May 1920 | Box 42 \ 4 Scan148 | |
| The demand for disc wheels over wire wheels and a request for sample hubs and American Michelin wheels for testing. | 25th May 1920 | Box 42 \ 4 Scan149 | |
| Acquisition and testing of Michelin disc wheels from America with demountable rims. | 23th Jun 1920 | Box 42 \ 4 Scan150 | |
| The cancellation of an order for Firestone rims following failures during high-speed road tests. | 25th Jun 1920 | Box 42 \ 4 Scan151 | |
| Comparing various wheel rims, with feedback from Mr. Crane and Mr. Fergusson on Firestone and Goodyear types. | 25th Jun 1920 | Box 42 \ 4 Scan152 | |
| Comparison of the safety features of tyre rim designs, specifically contrasting Firestone and Goodyear types. | 25th Jun 1920 | Box 42 \ 4 Scan153 | |
| Wheel and rim locking devices, comparing options from Dunlop, Rudge-Whitworth, and Firestone. | 25th Jun 1920 | Box 42 \ 4 Scan154 | |
| The quality and potential improvement of Firestone rims for wire wheels. | 25th Jun 1920 | Box 42 \ 4 Scan155 | |
| Fitting of Michelin Budd American wheels and a proposed visit from Michelin staff. | 7th Jan 1921 | Box 42 \ 4 Scan156 | |
| Letter to the Michelin Tyre Co. regarding the fitting of their American type wheels to an experimental car. | 7th Jan 1921 | Box 42 \ 4 Scan157 | |
| From 'R' outlining concerns about the design of wheels, rims, tyres, and body hinges on cars from Springfield. | 27th Jun 1923 | Box 42 \ 4 Scan158 | |
| Covering memo concerning Wire Wheel Spokes, forwarding an attached document from Springfield. | 10th Aug 1923 | Box 42 \ 4 Scan159 | |
| Letter discussing issues with Dunlop wire wheel spokes, comparing them against American-made spokes with material and stress test data. | 28th Jul 1925 | Box 42 \ 4 Scan160 | |
| Adoption of a new countersunk head wheel spoke over the existing Dunlop button-head spoke. | 11th Aug 1923 | Box 42 \ 4 Scan161 | |
| Modification to Rudge-Whitworth wheels and agreeing to a 10,000-mile test. | 29th Aug 1923 | Box 42 \ 4 Scan162 | |
| Cover memo regarding Flexilient Wheels, attaching a copy of another document and a pamphlet. | 3rd Mar 1924 | Box 42 \ 4 Scan163 | |
| Letter discussing the development and testing of Flexsilent wheels and similar rubberized plywood disc wheels. | 19th Feb 1924 | Box 42 \ 4 Scan164 | |
| Letter from Newport News Shipbuilding offering a new steel disc wheel with enclosed test reports. | 6th Feb 1924 | Box 42 \ 4 Scan165 | |
| Cover letter attaching correspondence from America regarding Flexsilient Wheels. | 11th Mar 1924 | Box 42 \ 4 Scan166 | |
| Follow-up letter regarding 'Flexilient Wheels', attaching further data from the Newport News Shipbuilding Company. | 28th Feb 1924 | Box 42 \ 4 Scan167 | |
| Letter concerning the standardization of American tires, detailing recent changes to the list of recommended sizes. | 8th Mar 1929 | Box 42 \ 4 Scan168 | |
| Wheel and tire specifications, including clearance, spoke count, and issues with drop center rims. | 22th Aug 1930 | Box 42 \ 4 Scan169 | |
| Tire and rim supply issues, the development of drop center rims, and competitor vehicle specifications. | 22th Aug 1930 | Box 42 \ 4 Scan170 | |
| Wheel and tire standardization, comparing American automotive trends with proposals for new equipment tests. | 22th Aug 1930 | Box 42 \ 4 Scan171 | |
| The use of American manufactured wood wheels and a request for specific rims and tyres. | 29th Sep 1919 | Box 42 \ 5 Scan001 | |
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