| Description | Date | Identifier | |
| Photograph showing the front suspension with RETRAC oil springs mounted inside the frame. | 17th Jun 1919 | Box 46 \ 1 Scan122 | |
| Diagram showing the attachment of RETRAC Oil Springs on a Cantilever Spring for a rear suspension system. | 1st Jan 1919 | Box 46 \ 1 Scan123 | |
| Diagram detailing the upper and lower front mounting of a leaf spring suspension. | 1st Jan 1919 | Box 46 \ 1 Scan124 | |
| Fitting instructions and diagram for a cantilever rear suspension mounting. | 1st Jan 1919 | Box 46 \ 1 Scan125 | |
| Instructions for mounting Retrac oil springs to standard automobiles. | 1st Jan 1919 | Box 46 \ 1 Scan126 | |
| Instructions for assembling and mounting front and rear oil springs, brackets, and bushings, with an accompanying diagram. | 3rd Jun 1919 | Box 46 \ 1 Scan127 | |
| Letter from The Retrac Co. discussing the benefits and trial of their oil spring shock absorbers. | 3rd Jun 1919 | Box 46 \ 1 Scan128 | |
| Letter from The Retrac Company to A. Wormald, Esq., concerning the shipment, function, and installation of Oil Springs. | 3rd Jun 1919 | Box 46 \ 1 Scan129 | |
| Compression and recoil graph for various spring and oil spring combinations under different conditions. | 3rd Jun 1919 | Box 46 \ 1 Scan130 | |
| Technical explanation of spring compression and recoil curves under various conditions of distortion and vibration. | 3rd Jun 1919 | Box 46 \ 1 Scan131 | |
| Explaining the purpose and benefits of oil springs for vehicle suspension. | 3rd Jun 1919 | Box 46 \ 1 Scan132 | |
| Automotive spring rates, suspension flexibility, and the practical application of high flexibility springs combined with Oil Springs. | 3rd Jun 1919 | Box 46 \ 1 Scan133 | |
| Graph of spring compression and recoil, also showing the effect of an oil spring under forced vibration. | 3rd Jun 1919 | Box 46 \ 1 Scan134 | |
| Photographs illustrating the application of RETRAC Oil Springs on the suspension of various cars. | 1st Jan 1918 | Box 46 \ 1 Scan135 | |
| Photograph showing the rear suspension of a Delaunay-Belleville car with RETRAC oil springs attached to platform springs. | 1st Jan 1918 | Box 46 \ 1 Scan136 | |
| Cover or mailer concerning 'Road Comfort' from The Retrac Co. | 1st Jan 1918 | Box 46 \ 1 Scan137 | |
| Promotional leaflet for 'The RETRAC OIL SPRING', a shock eliminator designed to improve car comfort and economy. | 13th Nov 1924 | Box 46 \ 1 Scan138 | |
| Differing opinions on Corronil versus Monel metal tubes, proposing swaging tests to determine the superior material. | 13th Nov 1924 | Box 46 \ 1 Scan139 | |
| Issues with splitting when fitting EAC 11 cylinders with Corronil metal tubes for testing. | 13th Nov 1924 | Box 46 \ 1 Scan140 | |
| Advising that Corronil tubing for push rods is unobtainable. | 31th Mar 1926 | Box 46 \ 1 Scan141 | |
| Trial use of Corronil for exhaust manifold tubes and silencers on the Phantom model. | 11th May 1927 | Box 46 \ 1 Scan142 | |
| The status of the Goshawk engine being fitted to a test bench. | 8th Sep 1920 | Box 46 \ 1 Scan143 | |
| Various schemes for the 'Goshawk' pedal gear and brake equalizing gear. | 18th Sep 1920 | Box 46 \ 1 Scan144 | |
| Design modifications to the Goshawk I and II clutch and brake pedals. | 7th Mar 1921 | Box 46 \ 1 Scan145 | |
| Modifications and design decisions for the Goshawk I clutch and brake pedals. | 17th Mar 1921 | Box 46 \ 1 Scan146 | |
| Providing blueprints and details for making three experimental sets of a pedal mechanism for a starter gear. | 1st Jun 1920 | Box 46 \ 1 Scan147 | |
| Blueprint for a proposed bakelite pad for an accelerator pedal. | 30th Jul 1923 | Box 46 \ 1 Scan148 | |
| Requesting confirmation on an alteration to a priming cock for a 40/50 chassis. | 24th Jun 1919 | Box 46 \ 1 Scan149 | |
| Removal of a spring on the priming cock for the 40/50 chassis. | 13th Mar 1920 | Box 46 \ 1 Scan150 | |
| Repositioning of the priming cock operating handle. | 13th Mar 1920 | Box 46 \ 1 Scan151 | |
| Alternative positions and operating methods for the priming device handle. | 1st Jun 1920 | Box 46 \ 1 Scan152 | |
| Discussion of various methods for arranging a flexible shaft and piping between the instrument board and the dash. | 1st Jun 1920 | Box 46 \ 1 Scan153 | |
| Suggestion for a plate to be mounted on the instrument board to indicate the position of a handle. | 1st Jun 1920 | Box 46 \ 1 Scan154 | |
| Stating Mr. Royce does not agree to an alteration of the priming cock handle position on the 40/50 HP chassis. | 7th Jun 1920 | Box 46 \ 1 Scan155 | |
| Requesting a report on the suitability of a priming cock with a spring removed for standardization. | 8th Oct 1920 | Box 46 \ 1 Scan156 | |
| On a new instrument board-operated primer for the 6.EX Car, detailing an issue and solution related to pressure in the fuel system. | 9th Oct 1920 | Box 46 \ 1 Scan157 | |
| Arrangement of the dashboard primer on chassis 6.EX, its issues with 'D' steering, and recommendations for alterations. | 12th Oct 1920 | Box 46 \ 1 Scan158 | |
| Proposal for fitting three 'Goshawk' cars with specific bodies, luggage grids, and spare wheels for a 10,000-mile trial. | 2nd Feb 1922 | Box 46 \ 2 Scan001 | |
| Telegram enquiring about the dispatch of three cars with Maythorn and Mulliner bodies for 10,000-mile trials. | 28th Feb 1922 | Box 46 \ 2 Scan002 | |
| Fitting luggage grids and tyre carriers to three Goshawk vehicles for a 10,000 miles trial. | 23th Feb 1922 | Box 46 \ 2 Scan003 | |
| Quoting coachbuilder Maythorns regarding the urgent need for a Goshawk chassis to meet a delivery deadline. | 22th Feb 1922 | Box 46 \ 2 Scan004 | |
| Telegram received by telephone regarding the delivery schedule for three 10,000-mile trial cars. | 24th Feb 1938 | Box 46 \ 2 Scan005 | |
| Letter confirming a telegram regarding the scheduling of three ordered bodies for Goshawk cars. | 24th Feb 1922 | Box 46 \ 2 Scan006 | |
| Telegram from London to Derby enquiring about the expected delivery of three Maythorns cars for 10,000-mile trials. | 24th Feb 1922 | Box 46 \ 2 Scan007 | |
| The completion of a Goshawk chassis and coordination with coachbuilder Mulliners before the car is sent to France. | 28th Feb 1922 | Box 46 \ 2 Scan008 | |
| Outlining arrangements for the 10,000 miles test on the Goshawk car and the delivery of a separate vehicle for Mr. Royce. | 1st Mar 1922 | Box 46 \ 2 Scan009 | |
| From Hy. requesting an order number for the 'Goshawks' 10,000 miles test. | 1st Mar 1922 | Box 46 \ 2 Scan010 | |
| Instructions for preparing three cars for the 10000 Miles Trial in France, detailing steering column and axle specifications. | 1st Mar 1922 | Box 46 \ 2 Scan011 | |
| Arrangements for a 10,000-mile trial for the Goshawk model. | 1st Mar 1922 | Box 46 \ 2 Scan012 | |
| Proposal for an extensive car testing expedition in Southern France. | 9th Mar 1922 | Box 46 \ 2 Scan013 | |
| Request for registration and licence for the V. Goshawk 11 car for a 10,000-mile trial. | 9th Mar 1922 | Box 46 \ 2 Scan014 | |
| Projected delivery schedule for various chassis to different coachbuilders. | 9th Mar 1922 | Box 46 \ 2 Scan015 | |
| Goshawk road test, detailing an ignition coil failure, its temporary replacement, and other vehicle performance observations. | 18th Mar 1922 | Box 46 \ 2 Scan016 | |
| The complete weight of a 5-Goshawk-II car and feedback on its performance. | 21th Mar 1922 | Box 46 \ 2 Scan017 | |
| Coil failure, performance feedback on Goshawk II trial cars, and carburetter issues. | 21th Mar 1922 | Box 46 \ 2 Scan018 | |
| 10,000-mile trials program and brake complaints on Goshawk models. | 21th Mar 1922 | Box 46 \ 2 Scan019 | |
| Steering jerk, oil leaks, and noisy oil pump issues on Goshawk-II models. | 21th Mar 1922 | Box 46 \ 2 Scan020 | |
| Issues found with the 5-Goshawk-II and 3-Goshawk-11 limousine models. | 21th Mar 1922 | Box 46 \ 2 Scan021 | |
| Arrangements for three Goshawk-II chassis bodies for the 10,000 miles trials. | 21th Mar 1922 | Box 46 \ 2 Scan022 | |
| Continued note discussing battery accessibility issues on Goshawk-II models. | 22th Jan 1922 | Box 46 \ 2 Scan023 | |
| Report from Folkestone detailing a travel delay due to weather and initial feedback on a car's performance. | 22th Jan 1922 | Box 46 \ 2 Scan024 | |
| Vehicle performance, noting tappet knock, petrol consumption, and issues with the clutch and gearbox. | 22th Jan 1922 | Box 46 \ 2 Scan025 | |
| Report detailing defects in the ball bearings, gears, brakes, and steering of a vehicle. | 22th Jan 1922 | Box 46 \ 2 Scan026 | |
| Vehicle's performance, noting issues with steering jerk and strong rear springs. | 22th Mar 1922 | Box 46 \ 2 Scan027 | |
| Programme and status of various Goshawk II experimental cars. | 22th Mar 1922 | Box 46 \ 2 Scan028 | |
| The modernisation of the 3-Goshawk-II limousine. | 22th Mar 1922 | Box 46 \ 2 Scan029 | |
| From CJ detailing plans for the allocation and testing of Goshawk project cars. | 21th Mar 1922 | Box 46 \ 2 Scan030 | |
| Logistics and body specifications for Goshawk-11 test cars and drivers. | 23th Mar 1922 | Box 46 \ 2 Scan031 | |
| Reallocation of a Goshawk 10,000-mile test car chassis for use as the 'Amateur Car'. | 23th Mar 1922 | Box 46 \ 2 Scan032 | |
| Goshawk 11, 10,000 miles test. | 24th Mar 1922 | Box 46 \ 2 Scan033 | |
| Cover note for the first report on the Goshawk 11, 10,000 miles test. | 24th Mar 1922 | Box 46 \ 2 Scan034 | |
| Report from Folkestone on the initial performance and issues of the S-Goshawk-11 car. | 22th Mar 1922 | Box 46 \ 2 Scan035 | |
| Test report on a vehicle's performance, detailing issues with the clutch, gearbox, sideshaft, axle, brakes, and steering, alongside handwritten annotations for follow-up actions. | 14th Oct 1937 | Box 46 \ 2 Scan036 | |
| First impression report on a car's road performance after 220 miles. | 14th Dec 1938 | Box 46 \ 2 Scan037 | |
| Ongoing engine issues on the Goshawk project, including carburation, timing wheel noise, and tappet knocks. | 24th Mar 1922 | Box 46 \ 2 Scan038 | |
| Issues with the clutch, gearbox, and foot brakes on Goshawk models. | 24th Mar 1922 | Box 46 \ 2 Scan039 | |
| Steering complaint and a proposed modification for the Goshawk-II. | 15th Sep 1917 | Box 46 \ 2 Scan040 | |
| Steering improvements and concerns over radiator water loss on Goshawk-ll models. | 27th Mar 1922 | Box 46 \ 2 Scan041 | |
| Steering improvements and investigating water loss from the radiator on the Goshawk-11. | 27th Mar 1932 | Box 46 \ 2 Scan042 | |
| Body options and testing considerations for the 7-GOSHAWK-11 'Amateur Test Car' chassis. | 27th Mar 1922 | Box 46 \ 2 Scan043 | |
| Fitting lighter springs based on weight. | 27th Mar 1922 | Box 46 \ 2 Scan044 | |
| Road test report detailing vehicle performance and issues over a long-distance drive in France. | 27th Mar 1922 | Box 46 \ 2 Scan045 | |
| Performance issues and proposed actions for a vehicle's steering, gearing, carburation filter, and brakes. | 27th Mar 1922 | Box 46 \ 2 Scan046 | |
| Issues with a Gwynne body fitment, hood mechanism, and petrol consumption. | 31th Mar 1922 | Box 46 \ 2 Scan047 | |
| Points for attention on the Goshawk II car, covering steering, radiator water loss, and clutch springs. | 31th Mar 1922 | Box 46 \ 2 Scan048 | |
| Typed letter discussing delays and carburetter experimentation for the Goshawk 11 vehicle. | 22th Mar 1922 | Box 46 \ 2 Scan049 | |
| Typed report on a vehicle road test, evaluating the performance of the engine, gearbox, clutch, and other components. | 15th Aug 1917 | Box 46 \ 2 Scan050 | |
| Vehicle condition report detailing issues with steering, ignition and rattles after a 1000-mile road test. | 15th Mar 1917 | Box 46 \ 2 Scan051 | |
| Cover note attaching a letter from 'Hs.' for information, concerning the Goshawk 11. | 28th Mar 1922 | Box 46 \ 2 Scan052 | |
| Letter discussing faulty steering levers and radiator water loss on the 6-Goshawk-ll car. | 29th Mar 1922 | Box 46 \ 2 Scan053 | |
| Findings from the Goshawk 10,000 miles test regarding shock absorbers, cooling system, and horn cut-outs. | 28th Mar 1922 | Box 46 \ 2 Scan054 | |
| Issues with the Goshawk model's shock absorbers, spring shackle wear, and steering. | 29th Mar 1922 | Box 46 \ 2 Scan055 | |
| Cabled report, development progress on the Goshawk car's S.U. carburetter and water circulation, and issues with speedometers. | 15th May 1917 | Box 46 \ 2 Scan056 | |
| Issues with silencer vibration, faulty coils, water circulation, and pedal position on Goshawk models. | 29th Mar 1922 | Box 46 \ 2 Scan057 | |
| Telegram about bent steering levers, requesting a new, stronger pair to be sent. | 29th Mar 1922 | Box 46 \ 2 Scan058 | |
| Decision to fit a Limousine body to the 7-Goshawk-2 Amateur Test Car chassis. | 29th Mar 1922 | Box 46 \ 2 Scan059 | |
| Cover note for a report regarding a Gwynne all-weather body fitted to a 5-Goshawk-11 car after 10,000 miles of use. | 30th Mar 1922 | Box 46 \ 2 Scan060 | |
| Report extract detailing faults and issues with a Gwynne all-weather car body. | 30th Mar 1922 | Box 46 \ 2 Scan061 | |
| Circulating a report on the running of Goshawk experimental cars. | 30th Mar 1922 | Box 46 \ 2 Scan062 | |
| 10,000-mile endurance testing strategy for the Goshawk car model. | 1st Mar 1922 | Box 46 \ 2 Scan063 | |
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