| Description | Date | Identifier | |
| Page two of a letter discussing car performance in India, covering steering, suspension, and petrol gauge issues. | 22th Jul 1932 | Box 52 \ 1 Scan170 | |
| Test report memo on the 174-MY Hooper's Demonstration Car, Standard Long Chassis, noting disappointments with its specification. | 5th May 1933 | Box 52 \ 1 Scan171 | |
| Fitting an improvement to a demonstration car while it is with the coachbuilders. | 6th May 1933 | Box 52 \ 1 Scan172 | |
| Springing and shock dampers for a Hooper's demonstration car with a standard long chassis. | 6th May 1933 | Box 52 \ 1 Scan173 | |
| Typewritten document fragment discussing the classification of an item. | 8th May 1933 | Box 52 \ 1 Scan174 | |
| Clarifying the standard specifications for Hooper's Demonstration Car, 174-MY, on a standard long chassis. | 8th May 1933 | Box 52 \ 1 Scan175 | |
| Replying to various questions regarding the demonstration chassis GDX-10 for Messrs. R.P. Collyer Limited. | 12th Jun 1933 | Box 52 \ 1 Scan176 | |
| The formulae and variables for spiral springs. | 29th Jan 1929 | Box 52 \ 1 Scan177 | |
| Page of calculations and formulas concerning spring stresses and design for minimum stress. | 29th Jan 1929 | Box 52 \ 1 Scan178 | |
| Page of mathematical equations and derivations from a larger document. | 31th Jan 1929 | Box 52 \ 1 Scan179 | |
| Technical data sheet defining the variables and formulas for spiral springs. | 31th Jan 1929 | Box 52 \ 1 Scan180 | |
| Page of formulas for calculating comparative stresses, deflection, and rate in springs. | 31th Jan 1929 | Box 52 \ 1 Scan181 | |
| Technical page with calculations for spring stress, rate, and coil diameter under a given load. | 31th Jan 1929 | Box 52 \ 1 Scan182 | |
| Calculations and specifications for a low rate spring. | 31th Jan 1929 | Box 52 \ 1 Scan183 | |
| Page of calculations for various engineering variables, including stress. | 31th Jan 1929 | Box 52 \ 1 Scan184 | |
| Specifications and calculations for a long low rate unenamelled spring. | 31th Jan 1929 | Box 52 \ 1 Scan185 | |
| Page of engineering calculations for determining material stress. | 31th Jan 1929 | Box 52 \ 1 Scan186 | |
| Calculation sheet for a long low rate spring, designated Z. | 31th Jan 1929 | Box 52 \ 1 Scan187 | |
| Proposed sandblasted finish on road springs to improve paint adhesion, awaiting coachbuilder feedback. | 24th Sep 1920 | Box 52 \ 2 Scan001 | |
| Follow-up letter regarding a sample of sand-blasted steel for road springs and a request for a report on its paintability. | 5th Nov 1920 | Box 52 \ 2 Scan002 | |
| Micro-examination report on samples of Firth's Air Hardening Gear Steel. | 4th Oct 1921 | Box 52 \ 2 Scan003 | |
| The continued chemical analysis and conclusions regarding the properties and heat treatment of a steel specimen. | 24th Oct 1921 | Box 52 \ 2 Scan004 | |
| Tensile tests on two sample bars of Firth's Air Hardening Gear Steel from Cast No. T5122 and Cast No. T5647. | 24th Oct 1921 | Box 52 \ 2 Scan005 | |
| Results of metallurgical tests on various test bars. | 19th Feb 1920 | Box 52 \ 2 Scan006 | |
| Communications with a supplier regarding the manufacture and testing of Goshawk 11 laminated road springs. | 4th Nov 1921 | Box 52 \ 2 Scan007 | |
| Contract with Firths for the supply of laminated road springs and decisions required for testing. | 4th Nov 1921 | Box 52 \ 2 Scan008 | |
| Testing timeline and necessity of Firths springs for the Goshawk 11. | 5th Nov 1921 | Box 52 \ 2 Scan009 | |
| Progress report on the manufacture of trial laminated road springs for the 'Goshawk 11'. | 8th Nov 1921 | Box 52 \ 2 Scan010 | |
| Hardening trials and delivery timelines for six trial sets of Chrome Vanadium Steel springs from a supplier named Firths. | 8th Nov 1921 | Box 52 \ 2 Scan011 | |
| Delay in testing hardening dies for Goshawk 11 laminated road springs due to a draughtsman's error. | 15th Nov 1921 | Box 52 \ 2 Scan012 | |
| Expressing disappointment over a four-week delay for laminated road springs from supplier Firths. | 15th Nov 1921 | Box 52 \ 2 Scan013 | |
| Correspondence with Thos. Firth & Sons about supplying main plates for Goshawk 11 laminated road springs. | 18th Nov 1921 | Box 52 \ 2 Scan014 | |
| Letter from a supplier regarding the manufacture and delivery of 'Goshawk 11' Laminated Road Springs. | 17th Nov 1921 | Box 52 \ 2 Scan015 | |
| Letter from Thos. Firth & Sons Ltd. regarding a delay in supplying springs and progress on hardening dies. | 17th Nov 1921 | Box 52 \ 2 Scan016 | |
| Sourcing of 'top leaves' from Firths and a proposal for in-house manufacturing of 'top plates' for experimentation. | 18th Nov 1921 | Box 52 \ 2 Scan017 | |
| Alterations to 'Goshawk 11' laminated road springs and the subsequent supplier delays. | 19th Nov 1921 | Box 52 \ 2 Scan018 | |
| Reply from a supplier regarding laminated road springs for the Goshawk 11 project. | 22th Nov 1921 | Box 52 \ 2 Scan019 | |
| Confirming an order for Chrome Vanadium Spring Steel for Goshawk 11 Laminated Road Springs. | 24th Nov 1921 | Box 52 \ 2 Scan020 | |
| Letter from supplier Thos. Firth & Sons regarding production delays for 'Goshawk 11' laminated road springs. | 20th Dec 1921 | Box 52 \ 2 Scan021 | |
| Notification from Thos. Firth & Sons, Limited regarding their works closure for Christmas. | 10th Dec 1920 | Box 52 \ 2 Scan022 | |
| Letter from a supplier regarding the first delivery of Goshawk II laminated road springs made from Chrome Vanadium Steel. | 29th Dec 1921 | Box 52 \ 2 Scan023 | |
| Quoting a letter from a supplier regarding the delivery of Goshawk II Laminated Road Springs. | 2nd Jan 1922 | Box 52 \ 2 Scan024 | |
| Manufacturing progress and delays of an order for Goshawk 11 laminated road springs. | 11th Jan 1922 | Box 52 \ 2 Scan025 | |
| The disappointing bump test results for Firths springs on the Goshawk 11. | 17th Jan 1922 | Box 52 \ 2 Scan026 | |
| Visit to Firths regarding the production and testing of 'Goshawk 11' laminated road springs. | 21th Jan 1922 | Box 52 \ 2 Scan027 | |
| The supply and specifications of springs from supplier Firths, detailing materials and plate thicknesses. | 21th Jan 1922 | Box 52 \ 2 Scan028 | |
| Scheme for ordering springs from the supplier, Firths. | 21th Jan 1922 | Box 52 \ 2 Scan029 | |
| Outlining the extensive requirements and frustrations regarding the testing of Firths springs for the Goshawk 11. | 3rd Jan 1922 | Box 52 \ 2 Scan030 | |
| Letter discussing the ordering and testing requirements for 'Goshawk 11' laminated road springs with supplier Thos. Firth & Sons Ltd. | 25th Jan 1922 | Box 52 \ 2 Scan031 | |
| Typed memo indicating a follow-up action upon receiving a reply. | 25th Jan 1922 | Box 52 \ 2 Scan032 | |
| Correspondence with Thos. Firth & Sons Ltd. concerning the design and testing of Goshawk II laminated road springs. | 27th Jan 1922 | Box 52 \ 2 Scan033 | |
| Reports on 'Goshawk 11' Laminated Road Springs and arranging a meeting with Thos. Firth & Sons Ltd. | 14th Feb 1922 | Box 52 \ 2 Scan034 | |
| 105-hour bumping test of the Goshawk 11 chassis, detailing spring failures and future test plans. | 14th Feb 1922 | Box 52 \ 2 Scan035 | |
| The production of a sample set of 'Goshawk II' laminated road springs for testing. | 23th Feb 1922 | Box 52 \ 2 Scan036 | |
| Letter from Thomas Firth & Sons confirming agreements on the design and manufacture of laminated springs for a Goshawk ll. | 22th Feb 1922 | Box 52 \ 2 Scan037 | |
| Letter regarding material considered as scrap and proceeding with the design of new springs. | 22th Feb 1922 | Box 52 \ 2 Scan038 | |
| Disagreement with supplier Firths and Sons over the quality of manufactured road springs. | 2nd Feb 1922 | Box 52 \ 2 Scan039 | |
| The delivery and specifications of laminated road springs for the Goshawk 11 project. | 27th Feb 1922 | Box 52 \ 2 Scan040 | |
| Delivery delay and material specifications for Goshawk 11 laminated road springs. | 7th Mar 1922 | Box 52 \ 2 Scan041 | |
| Delay and material specification issue with an order for 'Goshawk ll' laminated road springs from Thos. Firth & Sons Ltd. | 24th Mar 1922 | Box 52 \ 2 Scan042 | |
| Delay in delivering Goshawk 11 laminated road springs due to labour issues at the supplier, Thos. Firth & Sons Ltd. | 3rd Apr 1922 | Box 52 \ 2 Scan043 | |
| Letter forwarding a copy of correspondence from Thos. Firth & Sons Ltd. about the delivery and testing of 'Goshawk 11' laminated road springs. | 11th Apr 1922 | Box 52 \ 2 Scan044 | |
| Letter concerning the load test results for 'Goshawk 11' laminated road springs. | 12th Apr 1922 | Box 52 \ 2 Scan045 | |
| Table of loading tests for front and rear springs. | 9th Aug 1922 | Box 52 \ 2 Scan046 | |
| Confirming an agreement following a conversation and forwarding an attached note addressed to CJ. | 9th Aug 1922 | Box 52 \ 2 Scan047 | |
| Letter detailing delays and testing issues regarding Firth's Axle Springs. | 9th Aug 1922 | Box 52 \ 2 Scan048 | |
| Supply chain difficulties with spring suppliers Firths and Woodheads. | 9th Aug 1922 | Box 52 \ 2 Scan049 | |
| Confirming a conversation about an early report on 'Goshawk' Front Axle Springs. | 9th Aug 1922 | Box 52 \ 2 Scan050 | |
| The testing and delivery status of Goshawk 11 laminated road springs from Firth's. | 8th Aug 1922 | Box 52 \ 2 Scan051 | |
| Arranging a visit from Thos. Firth & Sons Ltd. to discuss laminated road spring manufacturing and collection by a 'Goshawk 11' experimental car. | 4th Sep 1922 | Box 52 \ 2 Scan052 | |
| Laminated road springs from supplier Thos. Firth & Sons Ltd., discussing proposals for new top plates and instructions for centre bolts. | 7th Sep 1922 | Box 52 \ 2 Scan053 | |
| Letter from a steel supplier regarding the testing of different types of steel for springs. | 6th Sep 1922 | Box 52 \ 2 Scan054 | |
| Bumping tests conducted on various car springs, discussing material composition and design modifications. | 6th Sep 1922 | Box 52 \ 2 Scan055 | |
| Continuation of a report detailing specifications for car springs, including materials and specific design points. | 8th Sep 1922 | Box 52 \ 2 Scan056 | |
| Letter from Thos. Firth & Sons Limited concerning the dispatch of experimental springs and the repair of broken top leaves. | 8th Sep 1922 | Box 52 \ 2 Scan057 | |
| Letter from a supplier regarding the testing and supply of laminated road springs. | 28th Sep 1922 | Box 52 \ 2 Scan058 | |
| Forwarding a letter from Thos. Firth & Sons Ltd. regarding road springs for comment. | 29th Sep 1922 | Box 52 \ 2 Scan059 | |
| Difficulty in pre-fixing the poundages for 'Goshawk 11' laminated road springs. | 18th Oct 1922 | Box 52 \ 2 Scan060 | |
| Request for a weekly list of 'Goshawk 11' orders to assist in estimating laminated road spring requirements. | 5th Oct 1922 | Box 52 \ 2 Scan061 | |
| Production estimates for the Goshawk 11 model, specifically the ratio of special to standard bodies and the resulting requirements for springs. | 13th Oct 1922 | Box 52 \ 2 Scan062 | |
| Implications of 'Goshawk 11' sales on the required range of spring poundages. | 16th Oct 1922 | Box 52 \ 2 Scan063 | |
| Requesting a report on Firth Axle Springs for the 'Goshawk' project and considering a further order with Woodhead. | 23th Oct 1922 | Box 52 \ 2 Scan064 | |
| Cover letter regarding a circular from Ferodo Ltd. about fabric interleaving for laminated road springs. | 24th Oct 1922 | Box 52 \ 2 Scan065 | |
| Letter from Ferodo Limited announcing a new fabric interleaving for motor car and lorry springs. | 20th Oct 1922 | Box 52 \ 2 Scan066 | |
| Testing Axle Springs from Messrs. Firth and ordering supplies from Woodhead for the 'Goshawk' project. | 7th Nov 1922 | Box 52 \ 2 Scan067 | |
| Urgent reminder to proceed with the purchase of 100 sets of 'Goshawk' Axle Springs from Messrs. Firth. | 17th Nov 1922 | Box 52 \ 2 Scan068 | |
| Internal memorandum discussing the material selection for Firths springs, comparing Chrome Vanadium and Silico Chrome. | 20th Nov 1922 | Box 52 \ 2 Scan069 | |
| Letter detailing the required poundages for two sets of Firth's 40/50 HP springs intended for experimental cars. | 16th Jan 1923 | Box 52 \ 2 Scan070 | |
| Letter from supplier Thos. Firth & Sons discussing issues and solutions for laminated road springs for a 40/50 HP Chassis. | 13th Jan 1923 | Box 52 \ 2 Scan071 | |
| Copy of a letter from Thos. Firth & Sons Limited thanking the recipient for assistance with springs and hoping for future bulk production. | 13th Jan 1923 | Box 52 \ 2 Scan072 | |
| Instruction to return front and rear springs to supplier Thos. Firth & Sons Ltd for correction. | 18th Jan 1923 | Box 52 \ 2 Scan073 | |
| Testing and rebuilding of Firth's 40/50 HP springs. | 9th Feb 1923 | Box 52 \ 2 Scan074 | |
| Test data for a Firths rear road spring, showing weights applied and released. | 16th Mar 1923 | Box 52 \ 2 Scan075 | |
| The receipt and specifications of two sets of Firth's 40/50 HP chassis road springs. | 26th Mar 1923 | Box 52 \ 2 Scan076 | |
| Questioning the proposed change of road spring supplier from Woodheads to Firths for the 40/50 and 20 hp models. | 12th Apr 1923 | Box 52 \ 2 Scan077 | |
| Standardisation sheet concerning the supply of Firths road springs for the 20HP chassis. | 4th Apr 1923 | Box 52 \ 2 Scan078 | |
| Reasoning behind an agreement with Messrs. Firths to reduce dependency on Woodheads for springs. | 1st Apr 1923 | Box 52 \ 2 Scan079 | |
| The incomplete standardisation sheet for Firths springs on the 20HP chassis, requiring signatures before use. | 11th Apr 1923 | Box 52 \ 2 Scan080 | |
| Process of obtaining signatures for the 20HP Firths Road Springs standardisation sheet. | 18th Apr 1923 | Box 52 \ 2 Scan081 | |
| Standardisation sheet for 20HP Firth's Road Springs. | 16th Apr 1923 | Box 52 \ 2 Scan082 | |
| | | | |
