| Description | Date | Identifier | |
| Suggestion to make valve washers lighter and tapered as per a sketch. | 18th Mar 1912 | Box 80 \ 3 scan0117 | |
| Record concerning a valve spring and the supply of spring washers. | 18th Mar 1912 | Box 80 \ 3 scan0118 | |
| Note from Mr. Royce regarding a new valve spring design to reduce stress. | 27th Mar 1912 | Box 80 \ 3 scan0119 | |
| To the Technical Committee detailing an experiment to test the noise levels of different cam patterns and valve springs. | 10th Apr 1912 | Box 80 \ 3 scan0120 | |
| Request for a scheme to set up a test rig for running two camshafts to criticize noise levels from different cam profiles. | 18th Apr 1912 | Box 80 \ 3 scan0121 | |
| Recurring broken valve spring failure and the experiments being conducted to resolve the issue. | 26th Apr 1912 | Box 80 \ 3 scan0122 | |
| To Mr. Royce regarding issues with sourcing and manufacturing valve springs. | 20th Jun 1912 | Box 80 \ 3 scan0123 | |
| The failure of valve springs, attributing the cause to vibration and material variation. | 20th Jun 1912 | Box 80 \ 3 scan0124 | |
| Page three of a typed document ending a sentence. | 21th Jun 1912 | Box 80 \ 3 scan0125 | |
| Record card for the supply and fitting of Ribbon Valve Springs. | 21th Jun 1912 | Box 80 \ 3 scan0126 | |
| Instruction card for the supply of Ribbon Valve Springs and associated parts. | 21th Jun 1912 | Box 80 \ 3 scan0127 | |
| Test report for ribbon valve shrings. | 2nd Jan 1912 | Box 80 \ 3 scan0128 | |
| Failure of ribbon valve springs during testing on a jig. | 18th Jul 1912 | Box 80 \ 3 scan0129 | |
| To Mr Wormald regarding the decision not to consult Mr Royce on valve spring issues. | 24th Jul 1912 | Box 80 \ 3 scan0130 | |
| Partial sentence from a typed letter or memo on watermarked paper. | 3rd Jul 1912 | Box 80 \ 3 scan0131 | |
| To Mr Barrington regarding the satisfactory testing of large taper valve springs. | 26th Jul 1912 | Box 80 \ 3 scan0132 | |
| The testing results for taper valve springs. | 23th Aug 1912 | Box 80 \ 3 scan0133 | |
| Ordering and testing of taper valve springs for experimental cars. | 29th Aug 1912 | Box 80 \ 3 scan0134 | |
| To Mr Barrington regarding the performance of large taper valve springs. | 7th Sep 1912 | Box 80 \ 3 scan0135 | |
| Report to Mr. Nadin regarding broken valve springs as reported by Hives. | 18th Oct 1912 | Box 80 \ 3 scan0136 | |
| Valve spring failures and fault analysis for chassis 2100E. | 4th Dec 1912 | Box 80 \ 3 scan0137 | |
| Spring failures due to faulty materials and manufacturing, detailing test results. | 10th Feb 1913 | Box 80 \ 3 scan0138 | |
| Stress, testing, sourcing, and hardening of valve springs. | 10th Feb 1913 | Box 80 \ 3 scan0139 | |
| Instruction sheet requesting information and analysis of valve springs from Mercedes and Napier engines. | 13th Feb 1913 | Box 80 \ 3 scan0140 | |
| Valve spring test, discussing rig modifications and obtaining competitor springs for comparison. | 14th Feb 1913 | Box 80 \ 3 scan0141 | |
| Departmental memo about enquiries into the supply of valve springs from various manufacturers. | 21th Feb 1913 | Box 80 \ 3 scan0142 | |
| Departmental memo chasing up a request for particulars on exhaust valve springs for Mercedes and Napier engines. | 28th Feb 1913 | Box 80 \ 3 scan0143 | |
| Napier valve springs, detailing measurements of length and weight for both exhaust and inlet springs. | 28th Feb 1913 | Box 80 \ 3 scan0144 | |
| Dimensional analysis of a Napier valve spring with a note on the unavailability of a Mercedes part. | 20th Aug 1912 | Box 80 \ 3 scan0145 | |
| Letter from Vickers Limited detailing the heat treatment process for spring steel. | 9th Apr 1913 | Box 80 \ 3 scan0146 | |
| The supply of wire for valve springs and a request for a report on their manufacture. | 11th Apr 1913 | Box 80 \ 3 scan0147 | |
| Quoting Mr. Royce's remarks on sourcing valve springs and preferred material. | 29th Apr 1913 | Box 80 \ 3 scan0148 | |
| Instruction to the Order Department to urgently order stronger valve springs for specific chassis and experimental purposes. | 14th May 1913 | Box 80 \ 3 scan0149 | |
| Potential issues with valve springs for the Austrian and Spanish Trials cars, suggesting a comparative test. | 26th May 1913 | Box 80 \ 3 scan0150 | |
| Stronger valve springs for Spanish Trials cars. | 30th May 1913 | Box 80 \ 3 scan0151 | |
| Order for four sets of valve springs for chassis 2354 and 2369. | 30th May 1913 | Box 80 \ 3 scan0152 | |
| Weekly report from Experimental Department 'B' on steering pivot tests and valve spring tempering. | 10th Jun 1913 | Box 80 \ 3 scan0153 | |
| Weekly report from the Experimental Department listing submitted reports and detailing valve spring tests. | 2nd Jul 1913 | Box 80 \ 3 scan0154 | |
| Note on the endurance testing of oil bath tempered valve springs. | 5th Jun 1918 | Box 80 \ 3 scan0155 | |
| Complaint log detailing a customer's issues with repeatedly breaking valve springs on car number 60503. | 30th Jul 1913 | Box 80 \ 3 scan0156 | |
| Complaint log detailing the investigation and resolution of an issue with defective springs for customer J. L. Clark. | 9th May 1913 | Box 80 \ 3 scan0157 | |
| Follow-up communication regarding a customer complaint about valve springs. | 9th May 1913 | Box 80 \ 3 scan0158 | |
| Memo discussing difficulties with valve springs and the destructive testing procedures for new batches. | 22th Aug 1918 | Box 80 \ 3 scan0159 | |
| Experiment No. 472 regarding the testing of valve springs tempered in an oil bath. | 31th Jul 1913 | Box 80 \ 3 scan0160 | |
| Experiment with valve springs tempered in an oil bath for the Spanish Trials cars. | 1st Aug 1913 | Box 80 \ 3 scan0161 | |
| Tempering of valve springs in an oil bath and its effects on engine performance. | 6th Aug 1913 | Box 80 \ 3 scan0162 | |
| Note on the performance of two batches of taper valve springs, one successful and one a failure. | 18th Aug 1913 | Box 80 \ 3 scan0163 | |
| Testing and results of different batches of valve springs. | 19th Aug 1913 | Box 80 \ 3 scan0164 | |
| Suggestion for valve springs that was not adopted. | 22th Aug 1913 | Box 80 \ 3 scan0165 | |
| Letter responding to a query about recurring issues with faulty valve springs from a supplier. | 25th Aug 1913 | Box 80 \ 3 scan0166 | |
| Rapid destructive test for valve springs and a request for a better design. | 4th Sep 1913 | Box 80 \ 3 scan0167 | |
| Need for a more severe, rapid destructive testing method for valve springs. | 1st Oct 1913 | Box 80 \ 3 scan0168 | |
| Testing stronger valve springs for increased engine speed. | 1st Oct 1913 | Box 80 \ 3 scan0169 | |
| Memo discussing valve spring modifications to increase engine RPM before valve jumping occurs. | 2nd Oct 1913 | Box 80 \ 3 scan0170 | |
| Proposing stronger valve springs to prevent jumping at increased engine speeds, with specific load and tempering requirements. | 14th Oct 1913 | Box 80 \ 3 scan0171 | |
| The progress of designing a rig for destructive testing of valve springs, with a handwritten reply. | 9th Dec 1913 | Box 80 \ 3 scan0172 | |
| Progress on a new rig for the rapid destructive testing of valve springs. | 17th Dec 1913 | Box 80 \ 3 scan0173 | |
| Chasing a delay on the development of a rig for the rapid destructive testing of valve springs. | 15th Jan 1914 | Box 80 \ 3 scan0174 | |
| Chasing a delayed request for a method of rapid destructive testing for valve springs. | 16th Jan 1914 | Box 80 \ 3 scan0175 | |
| Directive based on Mr. Royce's feedback to perform a destruction test on valve springs by running the existing rig at a higher speed. | 16th Jan 1914 | Box 80 \ 3 scan0176 | |
| Issues and alterations regarding valve springs, change speed levers, the car body, and despatch logistics. | 20th Jan 1914 | Box 80 \ 3 scan0177 | |
| Need for a dedicated rig for rapidly testing valve springs. | 22th Jan 1914 | Box 80 \ 3 scan0178 | |
| Authorization to construct a second high-speed valve spring testing rig due to high demand, using scrapped parts. | 26th Jan 1914 | Box 80 \ 3 scan0179 | |
| Instruction sheet for supplying scrap parts required for a test on valve springs. | 18th Feb 1914 | Box 80 \ 3 scan0180 | |
| Instruction sheet for a rapid test of valve springs and a list of related parts. | 18th Feb 1914 | Box 80 \ 3 scan0181 | |
| Instruction sheet for ordering various cast iron castings for a rapid test of valve springs. | 18th Feb 1914 | Box 80 \ 3 scan0182 | |
| Instruction sheet for erecting tackle for a rapid test of valve springs. | 19th Feb 1914 | Box 80 \ 3 scan0183 | |
| Instruction sheet to order two cast iron pulleys for a rapid test of valve springs. | 19th Feb 1914 | Box 80 \ 3 scan0184 | |
| The delay and progress in creating a rig for rapid destructive testing of valve springs. | 20th Feb 1914 | Box 80 \ 3 scan0185 | |
| Instruction sheet regarding a rapid test for valve springs and an order for two C.I. caps with a diagram. | 20th Feb 1914 | Box 80 \ 3 scan0186 | |
| Instruction sheet for the manufacture of an adapter for a camshaft for rapid valve spring testing. | 20th Feb 1914 | Box 80 \ 3 scan0187 | |
| Instruction sheet detailing a rapid test for valve springs and a method for supporting the front end of a crankcase. | 20th Feb 1914 | Box 80 \ 3 scan0188 | |
| Instruction sheet for a rapid test of valve springs. | 20th Feb 1914 | Box 80 \ 3 scan0189 | |
| Extract from a report on the Spanish Grand Prix regarding tappet spring failures. | 17th Jun 1914 | Box 80 \ 3 scan0190 | |
| Internal query and response regarding the correct washers to be used with Conical Valve Springs E4247. | 20th May 1914 | Box 80 \ 3 scan0191 | |
| Specification for conical valve springs fitted to chassis 58NA. | 26th May 1914 | Box 80 \ 3 scan0192 | |
| Correspondence regarding a customer query on the safe replacement interval for valve springs to prevent road-side breakages. | 15th Jun 1914 | Box 80 \ 3 scan0193 | |
| The replacement of valve springs, with a handwritten reply. | 17th Jun 1914 | Box 80 \ 3 scan0194 | |
| Issue with inlet valve springs and a request for remarks. | 1st May 1914 | Box 80 \ 3 scan0195 | |
| Responding to a query about valve springs, quoting Mr. Hives' recommendation on the matter. | 18th Jun 1914 | Box 80 \ 3 scan0196 | |
| Extract from a report on a 10,000-mile engine bench test, detailing valve mechanism issues. | 21th May 1914 | Box 80 \ 3 scan0197 | |
| Letter regarding the standardisation of taper valve springs by outsourcing the winding process to an external company. | 4th Jun 1918 | Box 80 \ 3 scan0198 | |
| Agreeing to the standardization and procurement of taper valve springs. | 25th Jun 1914 | Box 80 \ 3 scan0199 | |
| Request for a report on the rig test of taper valve springs for standardisation. | 25th Jun 1914 | Box 80 \ 3 scan0200 | |
| The rig testing of valve springs. | 11th Jul 1914 | Box 80 \ 3 scan0201 | |
| The urgent need to fit improved valve springs made from Woodhead's steel. | 13th Jul 1914 | Box 80 \ 3 scan0202 | |
| Confirming agreement for the standardisation of valve springs and recessed washers. | 20th Jul 1914 | Box 80 \ 3 scan0203 | |
| Communication protocols and agreeing to the standardization of valve springs and recessed washers. | 3rd May 1914 | Box 80 \ 3 scan0204 | |
| Failure of valve springs and seeking clarification on the cause from Mr Royce. | 9th Jul 1915 | Box 80 \ 3 scan0205 | |
| Extract note regarding the fitting of stronger valve springs. | 22th Oct 1915 | Box 80 \ 3 scan0206 | |
| Proposal from 'Joy Supply' for a simplified method of removing and replacing engine valves. | 3rd Apr 1920 | Box 80 \ 3 scan0207 | |
| Drawing of a valve spring support with dimensions labelled A, B, C, and D. | 7th Apr 1920 | Box 80 \ 3 scan0208 | |
| Instructional leaflet for 'Joy Valve Spring Supports', a time-saving device for internal combustion engines. | 4th Apr 1912 | Box 80 \ 3 scan0209 | |
| Departmental memo detailing the heat treatment and testing process for valve springs. | 4th Apr 1912 | Box 80 \ 3 scan0210 | |
| The testing and fitting of brass strips to bonnets. | 10th Apr 1912 | Box 80 \ 3 scan0211 | |
| Record of updates and testing for bearing strips for bonnet seats. | 23th Oct 1912 | Box 80 \ 3 scan0212 | |
| Departmental memo regarding a 10,000-mile equivalent test on a standard valve spring. | 8th Jul 1912 | Box 80 \ 3 scan0213 | |
| Analysis of a valve spring and the procurement of suitable materials or new springs. | 11th Jul 1912 | Box 80 \ 3 scan0214 | |
| The failure of a Vickers BCT Steel Valve spring C 916 after 60 hours of testing. | 29th Aug 1912 | Box 80 \ 3 scan0215 | |
| Failure of a Vickers valve spring during testing on a test rig. | 29th Aug 1912 | Box 80 \ 3 scan0216 | |
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