| Description | Date | Identifier | |
| Departmental memo to Mr. Royce regarding a 10,000-mile rig test for Taper Valve Springs, with his handwritten notes on material and heat treatment. | 10th Sep 1912 | Box 80 \ 3 scan0217 | |
| The failure of a new taper valve spring during testing and advising against its adoption. | 26th Sep 1912 | Box 80 \ 3 scan0218 | |
| Valve spring tests, noting failures due to material flaws and recommending returning the unsatisfactory batch. | 2nd Oct 1912 | Box 80 \ 3 scan0219 | |
| Letter detailing the results of endurance tests on several sets of taper valve springs, reporting breakages and requesting further investigation. | 10th Oct 1912 | Box 80 \ 3 scan0220 | |
| The successful testing of special taper valve springs and Mr. Royce's hardening instructions. | 22th Oct 1912 | Box 80 \ 3 scan0221 | |
| Valve spring tests, noting breakages in standard and special set-ups after mileage. | 31th Oct 1912 | Box 80 \ 3 scan0222 | |
| Valve spring failures during testing on a test rig. | 7th Nov 1912 | Box 80 \ 3 scan0223 | |
| Report to Mr Royce on the failure of taper valve springs due to flaws from the drawing process. | 7th Nov 1912 | Box 80 \ 3 scan0224 | |
| The failure of two taper valve springs during rig testing, noting potential flaws. | 8th Nov 1912 | Box 80 \ 3 scan0225 | |
| Taper valve spring breakages, attributing the fault to defective metal rather than design. | 16th Nov 1912 | Box 80 \ 3 scan0226 | |
| Testing taper valve springs, identifying a faulty batch due to broken springs and poor material quality. | 3rd Dec 1912 | Box 80 \ 3 scan0227 | |
| Instruction sheet detailing the testing and failure rates of valve springs. | 10th Jun 1912 | Box 80 \ 3 scan0228 | |
| Special parts, specifically valve spring breakages and fault analysis for Chassis 2100E. | 4th Dec 1912 | Box 80 \ 3 scan0229 | |
| Failure of various springs due to suspected faulty material and manufacture. | 10th Feb 1913 | Box 80 \ 3 scan0230 | |
| Valve spring stresses, testing procedures, and steel hardening methods. | 10th Feb 1913 | Box 80 \ 3 scan0231 | |
| Explaining a delay in an experiment on Poldi Valve Springs due to the late receipt of parts. | 13th Feb 1913 | Box 80 \ 3 scan0232 | |
| Delay and quality issue with Poldi valve springs. | 21th Feb 1913 | Box 80 \ 3 scan0233 | |
| Extract from Mr Royce's memo regarding ordering steel springs from multiple makers. | 28th Feb 1913 | Box 80 \ 3 scan0234 | |
| Napier valve springs with detailed measurements for exhaust and inlet springs. | 28th Feb 1913 | Box 80 \ 3 scan0235 | |
| Typed note regarding a Mercedes car and a hand-drawn sketch of a spring with dimensions. | 8th May 1912 | Box 80 \ 3 scan0236 | |
| Test and failure log for valve springs, part number C916. | 8th May 1912 | Box 80 \ 3 scan0237 | |
| Log of reports and modifications related to valve springs. | 7th Mar 1912 | Box 80 \ 3 scan0238 | |
| The failure of a Vickers B.C.T. exhaust valve spring during a 36-hour test run. | 18th Jul 1912 | Box 80 \ 3 scan0239 | |
| To Mr Barrington regarding the testing of T.C. Vickers Valve springs. | 26th Jul 1912 | Box 80 \ 3 scan0240 | |
| Departmental memo suggesting a method for testing experimental valve springs. | 6th Mar 1913 | Box 80 \ 3 scan0241 | |
| Testing valve springs and quoting Mr Royce's suggestion to order samples from various makers. | 6th Mar 1913 | Box 80 \ 3 scan0242 | |
| Bouncing of valve springs as a method to judge their soundness, referencing a detailed report. | 10th Mar 1913 | Box 80 \ 3 scan0243 | |
| Weekly report from the Experimental Department detailing finished tests and work in progress. | 11th Mar 1913 | Box 80 \ 3 scan0244 | |
| Departmental memo requesting information on Delaunay Belleville and Lanchester type valve springs for Mr. Elliott's trip to France. | 18th Mar 1913 | Box 80 \ 3 scan0245 | |
| Document detailing the specifications of engine valve springs for Delaunay Belleville and Lanchester models. | 18th Mar 1913 | Box 80 \ 3 scan0246 | |
| Final report on the testing of Poldi Valve Springs, which was abandoned due to a high failure rate. | 18th Mar 1913 | Box 80 \ 3 scan0247 | |
| Mr. Royce's remarks on an urgency report concerning the sourcing of Silicon Chrome steel. | 28th Apr 1913 | Box 80 \ 3 scan0248 | |
| Extract from Mr. Royce discussing valve spring experiments and performance comparisons. | 28th Aug 1913 | Box 80 \ 3 scan0249 | |
| Quoting Mr Royce on valve spring experiments and performance comparisons. | 28th Aug 1913 | Box 80 \ 3 scan0250 | |
| The testing of valve springs from various manufacturers. | 26th Jan 1914 | Box 80 \ 3 scan0251 | |
| Requesting a decision from Mr. Royce on whether to proceed with or abandon spring experiments. | 26th Jan 1914 | Box 80 \ 3 scan0252 | |
| The comparative testing of valve springs from various suppliers. | 23th Feb 1914 | Box 80 \ 3 scan0253 | |
| Inquiry regarding an experiment on exhaust valve springs and the cancellation of tests by outside firms. | 24th Mar 1914 | Box 80 \ 3 scan0254 | |
| To Mr. Coverley regarding arrangement drawings for various shafts and an electrometer suspension. | 1st Apr 1919 | Box 80 \ 3 scan0255 | |
| Print F.6532 for an electromotor suspension. | 6th Jun 1919 | Box 80 \ 3 scan0256 | |
| List of parts assembled onto Chassis 1. E.X., detailing part numbers and remarks. | 30th Jun 1919 | Box 80 \ 3 scan0257 | |
| The arrangement of an electromotor suspension, referencing print F.6532. | 1st Jul 1919 | Box 80 \ 3 scan0258 | |
| The starting motor support for the 'Goshawk' engine, referencing drawing No. LeC.1145. | 2nd Mar 1920 | Box 80 \ 3 scan0259 | |
| Print for a Goshawk Starter Motor support. | 2nd Mar 1920 | Box 80 \ 3 scan0260 | |
| Instruction to add a dimension of .250±10 to the drawing N.4058 for the Goshawk engine's starter motor suspension supporting strap casting. | 21th Jul 1933 | Box 80 \ 3 scan0261 | |
| Alterations to the 'Goshawk II' engine starter and rear crankcase suspension. | 8th Apr 1921 | Box 80 \ 3 scan0262 | |
| Design feedback from Mr. Royce on a Goshawk 11 rear engine support. | 26th May 1921 | Box 80 \ 3 scan0263 | |
| Order for Dunlop tyres and inner tubes for a Goshawk 11 chassis with Michelin Budd wheels. | 19th Oct 1932 | Box 81 \ 1 scan0001 | |
| Urgent order for Dunlop tyres and inner tubes for the Goshawk 11 chassis. | 14th Nov 1921 | Box 81 \ 1 scan0002 | |
| Order for Dunlop tyres and covers for the Experimental Goshawk chassis. | 13th Feb 1922 | Box 81 \ 1 scan0003 | |
| Correcting an error in a tyre order for the 'Goshawk'. | 20th Feb 1922 | Box 81 \ 1 scan0004 | |
| Instructions for the return of four Dunlop Magnum cord covers to the manufacturer. | 20th Mar 1922 | Box 81 \ 1 scan0005 | |
| Weights and production status of wheels and rims supplied by Rudge Whitworth Co. and Dunlop Co. | 21th Feb 1922 | Box 81 \ 1 scan0006 | |
| The estimated and actual weights of various wheels and tyres. | 21th Feb 1922 | Box 81 \ 1 scan0007 | |
| Forwarding a copy of a letter from Mr. Royce regarding Goshawk wheels and tyres, comparing rim weights and discussing negotiations with Rudge-Whitworth. | 22th Feb 1922 | Box 81 \ 1 scan0008 | |
| Comparing the weight of straight-sided and beaded wheels for the Goshawk model. | 2nd Feb 1922 | Box 81 \ 1 scan0009 | |
| Urgent order for three Dunlop tyre covers. | 9th Mar 1922 | Box 81 \ 1 scan0010 | |
| Tyre circumferences and pressures for a Goshawk speedometer. | 6th Mar 1922 | Box 81 \ 1 scan0011 | |
| Jack clearance measurements for Goshawk cars with deflated and inflated tyres. | 22th Mar 1922 | Box 81 \ 1 scan0012 | |
| The importance of tyre pressures for Goshawk-11 cars. | 19th Apr 1922 | Box 81 \ 1 scan0013 | |
| Letter to the Dunlop Tyre Company regarding a dispute over recommended tyre pressures. | 28th Apr 1922 | Box 81 \ 1 scan0014 | |
| The performance and safety advantages of straight-sided Dunlop cord tyres compared to clincher pattern types. | 28th Apr 1922 | Box 81 \ 1 scan0015 | |
| Safety test report comparing Stanwell, Goodyear, and Firestone demountable rims and straight-sided tyres. | 19th May 1920 | Box 81 \ 1 scan0016 | |
| Standardizing Goodyear demountable rims on English and American chassis. | 7th Jun 1922 | Box 81 \ 1 scan0017 | |
| The failure and poor performance of Belgrave tyres fitted on a Goshawk-11 vehicle. | 7th Jun 1922 | Box 81 \ 1 scan0018 | |
| Request for five Dunlop complete tyres for a 20 HP car. | 18th Jul 1923 | Box 81 \ 1 scan0019 | |
| Alterations to tyre types, proposing larger, more supple tyres with lower air pressure. | 15th Aug 1923 | Box 81 \ 1 scan0020 | |
| Preference for a 6-inch measurement over a 7-inch one for safety. | 27th May 1924 | Box 81 \ 1 scan0021 | |
| Discrepancy in recommended tyre pressures for a 20 HP chassis. | 27th May 1924 | Box 81 \ 1 scan0022 | |
| On optimal tyre pressures for various chassis types and performance feedback for Dunlop. | 28th May 1924 | Box 81 \ 1 scan0023 | |
| Chasing a previous request for information on tyre mileage for car 5G-11, as Dunlop is pressing for a settlement. | 29th Oct 1924 | Box 81 \ 1 scan0024 | |
| Letter from Dunlop Rubber Co Ltd. following up on tyre sets supplied for testing on cars. | 1st Apr 1925 | Box 81 \ 1 scan0025 | |
| Letter to Dunlop Rubber Co. Ltd. regarding tyre testing and issues with high speed steering wobble. | 15th Apr 1925 | Box 81 \ 1 scan0026 | |
| Standardization of larger petrol tank sizes in preference to auxiliary tanks. | 2nd Jul 1919 | Box 81 \ 1 scan0027 | |
| Redesign of a 20-gallon petrol tank and proposing a significant capacity increase. | 19th Aug 1919 | Box 81 \ 1 scan0028 | |
| Policy decision to standardize a 20-gallon petrol tank over a larger 25-gallon alternative. | 20th Aug 1919 | Box 81 \ 1 scan0029 | |
| Capacity and potential redesign of a 20-gallon petrol tank for a 40/50 HP car. | 25th Aug 1919 | Box 81 \ 1 scan0030 | |
| Whether to build a 20-gallon petrol tank and when to incorporate improvements for it. | 22th May 1919 | Box 81 \ 1 scan0031 | |
| Request for new, portable chassis templates to test rear axle and wing clearances on the Goshawk. | 5th Dec 1922 | Box 81 \ 1 scan0032 | |
| Cover page for experiment X.332, which arose from experiment X.93. | 12th Apr 1913 | Box 81 \ 1 scan0033 | |
| Departmental memo regarding an unsatisfactory singing noise from the double type throttle during testing. | 12th Apr 1913 | Box 81 \ 1 scan0034 | |
| Requesting an investigation into two different throttle designs and halting car deliveries until a definite cure is found. | 27th Feb 1913 | Box 81 \ 1 scan0035 | |
| Throttle diaphragm, requesting a comparison of the original part against standard practice. | 14th Apr 1913 | Box 81 \ 1 scan0036 | |
| Instructions to investigate a singing and ringing noise in the carburettor caused by the throttle diaphragm. | 16th Apr 1913 | Box 81 \ 1 scan0037 | |
| Urgent request for a report on the causes and solutions for a singing/ringing throttle diaphragm in a standard carburettor. | 16th Apr 1933 | Box 81 \ 1 scan0038 | |
| Departmental memo discussing experiments, tests, and findings related to a throttle diaphragm. | 17th Apr 1913 | Box 81 \ 1 scan0039 | |
| Replies and tests regarding a throttle diaphragm issue. | 17th Apr 1913 | Box 81 \ 1 scan0040 | |
| 'singing' noise from diaphragms, concluding it is an adjustment issue not a design flaw. | 17th Apr 1913 | Box 81 \ 1 scan0041 | |
| 'singing' issue with the throttle diaphragm, concluding it's a matter of adjustment. | 19th Apr 1913 | Box 81 \ 1 scan0042 | |
| Mr. Royce's requested alterations to the chassis tool kit and its contents. | 21th Aug 1919 | Box 81 \ 1 scan0043 | |
| Query to Mr. Royce regarding the design and use of spanners and file handles in a tool kit. | 16th Apr 1919 | Box 81 \ 1 scan0044 | |
| Suggestion from Mr. Royce for a new taper reamer design to create a stepped hole. | 6th Jun 1920 | Box 81 \ 1 scan0045 | |
| Design and testing of experimental reamers and the advantages of a left-hand taper tap. | 1st Jun 1920 | Box 81 \ 1 scan0046 | |
| Comparison of particulars from two R.A.C. tests between a Napier and another 6-cylinder vehicle. | 1st Jun 1920 | Box 81 \ 1 scan0047 | |
| Comparison table of performance metrics from two R.A.C. tests, one for a Napier and one for a Rolls-Royce vehicle. | 1st Jun 1920 | Box 81 \ 1 scan0048 | |
| Comparative data sheet of two R.A.C. tests between a Napier and a Rolls-Royce vehicle. | 1st Jun 1920 | Box 81 \ 1 scan0049 | |
| Performance comparison between a Napier Car and a 40/50 model. | 20th May 1912 | Box 81 \ 1 scan0050 | |
| Departmental memo suggesting the inclusion of the 1912 Monte Carlo Rally victory in the new Instruction Book. | 20th May 1912 | Box 81 \ 1 scan0051 | |
| Typewritten list of performance metrics including consumption, speed, weight, and gear ratio. | 23th May 1919 | Box 81 \ 1 scan0052 | |
| Promotional letter from The Victor Tyre Co. Ltd. about their 'Victor Vest' tyre accessory. | 27th Aug 1919 | Box 81 \ 1 scan0053 | |
| | | | |
