| Description | Date | Identifier | |
| Material properties chart for Chrome Vanadium steel from Thos. Firth & Sons Ltd. | 2nd Mar 1927 | Box 54 \ 3 Scan194 | |
| Suitability of stiffer springs and shock absorbers for cars in Spain. | 14th Mar 1927 | Box 54 \ 3 Scan195 | |
| Spring stiffness for cars intended for use in Spain and other Continental countries. | 10th Oct 1923 | Box 54 \ 3 Scan196 | |
| Request to obtain American-made Silchrome Valves for rebuilt Condor engines undergoing testing. | 10th Oct 1923 | Box 54 \ 3 Scan197 | |
| Outlining the testing procedure for engine valves made from Firths and American Silchrome steel during a 10,000-mile trial. | 5th Jun 1924 | Box 54 \ 3 Scan198 | |
| Consignment of 52 Thomson Silchrome Steel valves from the U.S.A. for testing on 20 HP chassis engines. | 17th Jun 1924 | Box 54 \ 3 Scan199 | |
| Suggestion to standardise the use of Silchrome valves for 20 HP cars. | 8th Jun 1924 | Box 54 \ 3 Scan200 | |
| Instruction to immediately commence using the new E.53158 valves for 20 HP engines. | 20th Jun 1924 | Box 54 \ 3 Scan201 | |
| Proposal to use existing stock of Chromium Steel valves and new Silchrome valves for 20-HP chassis. | 1st Jul 1924 | Box 54 \ 3 Scan202 | |
| Use and distinctive marking of Chromium and Silchrome valves for the 20 HP engine. | 2nd Jul 1924 | Box 54 \ 3 Scan203 | |
| Issues with a valve supplier and proposing the standardization of an alternative Special High Silicon Steel from a different manufacturer. | 12th Aug 1924 | Box 54 \ 3 Scan204 | |
| Standardisation report on the use of Firths 'Silchrome' steel for engine valves. | 21th Aug 1924 | Box 54 \ 3 Scan205 | |
| Supply of new Silchrome exhaust valves for chassis GF.54. | 10th Sep 1924 | Box 54 \ 3 Scan206 | |
| Different practices for Silchrome valves in aero engines versus chassis. | 11th Mar 1925 | Box 54 \ 3 Scan207 | |
| Silicon Chrome Steel for valves, comparing a French study with an internal specification. | 25th Aug 1926 | Box 54 \ 3 Scan208 | |
| Inquiry regarding F.10. valves. | 1st Jul 1926 | Box 54 \ 3 Scan209 | |
| Article on French experimental research into different compositions of valve steels, including a data table of their properties. | 1st Jul 1926 | Box 54 \ 3 Scan210 | |
| Article from an automotive journal describing a new type of underframe for rail cars that allows them to negotiate sharp curves. | 1st Jul 1926 | Box 54 \ 3 Scan211 | |
| Request to the laboratory for a chemical analysis of Silchrome steel valves made by Firths. | 18th Sep 1926 | Box 54 \ 3 Scan212 | |
| Laboratory report on the Brinell hardness and chemical analysis of Firth's Silchrome valves. | 27th Sep 1926 | Box 54 \ 3 Scan213 | |
| Performance and testing of Silchrome valve steel for all engines. | 29th Dec 1927 | Box 54 \ 3 Scan214 | |
| Laboratory report on Izod tests of Silchrome valve steel at varying temperatures and silicon content. | 1st Jan 1928 | Box 54 \ 3 Scan215 | |
| Valve material performance, detailing failures and comparing old designs with the current standard. | 11th May 1928 | Box 54 \ 3 Scan216 | |
| Valve steel specifications, a failure analysis related to silicon content, and a recommendation to switch to austenitic steel. | 11th May 1928 | Box 54 \ 3 Scan217 | |
| Proposal for testing the effect of prolonged heat treatment on Silchrome exhaust valves. | 16th May 1928 | Box 54 \ 3 Scan218 | |
| Performance and selection of different valve steels, such as austenitic and silchrome, for engines. | 18th May 1928 | Box 54 \ 3 Scan219 | |
| Continued note on production difficulties with austenitic steel for valves, mentioning the A.I.D. and silchrome. | 15th Jun 1928 | Box 54 \ 3 Scan220 | |
| Procedures for forging, testing, and producing valves from special valve steels. | 15th Jun 1928 | Box 54 \ 3 Scan221 | |
| The construction and performance characteristics of an annular spark gap. | 26th Jan 1922 | Box 54 \ 3 Scan222 | |
| Spark gap testing, noting issues with regular sparking and its relation to condenser capacities. | 23th Nov 1921 | Box 54 \ 3 Scan223 | |
| Letter to M.L. Magneto Syndicate requesting information on a 12,000-volt annular spark gap and voltmeter. | 11th Jun 1924 | Box 54 \ 3 Scan224 | |
| Letter from M-L Magneto Synd. Ltd. regarding data on spark gaps and electrostatic voltmeters. | 13th Jun 1924 | Box 54 \ 3 Scan225 | |
| Letter to M.L. Magneto Synd. Ltd. regarding a paper, an 8000 volt gap, and literature from Kelvin, Bottomley and Laird. | 30th Jun 1924 | Box 54 \ 3 Scan226 | |
| Letter from The M-L Magneto Synd. Ltd. concerning a spark gap, voltage measurements, and a quotation. | 1st Jul 1924 | Box 54 \ 3 Scan227 | |
| Letter to The M-L Magneto Synd. Ltd. regarding a 7,400-volt spark gap sent for trial. | 4th Jul 1924 | Box 54 \ 3 Scan228 | |
| Letter from M-L Magneto Synd. Ltd. confirming a spark gap sent is for the recipient's own use and does not need to be returned. | 5th Jul 1924 | Box 54 \ 3 Scan229 | |
| Letter to The M.L. Magneto Synd. Ltd. regarding the retention of a spark gap. | 7th Jul 1924 | Box 54 \ 3 Scan230 | |
| ROY to EFC forwarding a communication from Messrs. Lucas and arranging for a 'Resistance' part to be passed on. | 18th Jul 1924 | Box 54 \ 3 Scan231 | |
| Explaining the advantages and electrical properties of an annular spark gap. | 16th Jul 1924 | Box 54 \ 3 Scan232 | |
| Page of calculations for the electric potential and force between cylindrical conductors. | 16th Jul 1924 | Box 54 \ 3 Scan233 | |
| Page of mathematical analysis concerning electric force and potential difference in relation to wire diameter. | 1st Jul 1924 | Box 54 \ 3 Scan234 | |
| The optimal ratios and characteristics for spark gap design. | 16th Jul 1924 | Box 54 \ 3 Scan235 | |
| Comparison of a concentric sphere gap, including formulas for electric force and potential difference. | 17th Jul 1924 | Box 54 \ 3 Scan236 | |
| Letter from Joseph Lucas Ltd. regarding the development and testing of a Magneto with Automatic Advance for a 40/50 HP Chassis. | 17th Jul 1924 | Box 54 \ 3 Scan237 | |
| Check of resistances for an Alcohol-Rose Bengal chemical leak from Dr. Turner. | 24th Jul 1924 | Box 54 \ 3 Scan238 | |
| Letter to Joseph Lucas Ltd. regarding a sample magneto with automatic advance for a 40/50 Chassis and requesting to purchase test apparatus. | 13th Aug 1924 | Box 54 \ 3 Scan239 | |
| Instructions detailing the testing of sparking voltages for two different annular gaps on A.C. | 14th Aug 1924 | Box 54 \ 3 Scan240 | |
| Letter from Joseph Lucas Limited regarding an apparatus being offered with their compliments. | 21th Aug 1924 | Box 54 \ 3 Scan241 | |
| Letter to Joseph Lucas Ltd. confirming an agreement to retain an apparatus indefinitely for testing magnetos. | 22th Aug 1924 | Box 54 \ 3 Scan242 | |
| Modifying an annular spark gap, requiring two sets of new interchangeable electrodes. | 10th Sep 1924 | Box 54 \ 3 Scan243 | |
| Requesting the manufacture of a central electrode to go with an earthed electrode for an annular spark gap. | 9th Oct 1924 | Box 54 \ 3 Scan244 | |
| Tests on annular spark gaps under various conditions. | 21th Oct 1924 | Box 54 \ 3 Scan245 | |
| The performance of a 6-cylinder magneto and experimental work on annular spark gaps. | 20th Oct 1924 | Box 54 \ 3 Scan246 | |
| Standardising a shunted leak for magneto performance testing to simulate poor spark plug conditions. | 20th Oct 1924 | Box 54 \ 3 Scan247 | |
| Investigation into electrostatic principles and coronal discharge in annular gaps, comparing different electrode sets. | 20th Oct 1924 | Box 54 \ 3 Scan248 | |
| Table of measurements and observations for different annular gap configurations and resulting coronal discharge. | 8th Oct 1924 | Box 54 \ 3 Scan249 | |
| The standardization of magneto performance testing and comparison of different magneto models. | 20th Oct 1924 | Box 54 \ 3 Scan250 | |
| Performance specification for a six-cylinder magneto with automatic advance for the 40/50 car, version 2. | 20th Oct 1924 | Box 54 \ 3 Scan251 | |
| Series of magneto tests, including endurance, circuit, and utility tests under adverse conditions. | 20th Oct 1924 | Box 54 \ 3 Scan252 | |
| Specifications for magneto firing speeds, timing, and silent operation. | 16th Jul 1924 | Box 54 \ 3 Scan253 | |
| The advantages and electrical properties of an annular spark gap. | 16th Jul 1924 | Box 54 \ 3 Scan254 | |
| Page of calculations for electric potential and force between a central wire and an outer cylinder. | 16th Jul 1924 | Box 54 \ 3 Scan255 | |
| Mathematical analysis of electric force at the surface of a wire and conditions for brush discharge. | 16th Jul 1924 | Box 54 \ 3 Scan256 | |
| Analysis of annular spark gap design, focusing on wire-to-hole diameter ratios and preventing brush discharge. | 16th Jul 1924 | Box 54 \ 3 Scan257 | |
| Page comparing concentric sphere gaps, including formulas for electric force and potential difference. | 4th Jun 1925 | Box 54 \ 3 Scan258 | |
| Instructions for a utility test on a standard battery ignition system with a standard chemical leak. | 4th Jun 1925 | Box 54 \ 3 Scan259 | |
| Instruction sheet detailing distributor test results concerning conductivity and spark missing. | 29th Aug 1920 | Box 54 \ 3 Scan260 | |
| Instructions detailing a test on a battery ignition system with an additional standard ballast in series. | 20th Jun 1925 | Box 54 \ 3 Scan261 | |
| Letter to Dr. Turner at The Lucas Electrical Co. requesting assistance with repairing a broken rose bengal high resistance glass tube. | 17th Jul 1929 | Box 54 \ 3 Scan262 | |
| Letter from Joseph Lucas Research Laboratories enclosing notes and discussing apparatus. | 19th Jul 1929 | Box 54 \ 3 Scan263 | |
| Letter on methods for sealing and calibrating a liquid resistance utility instrument. | 19th Jul 1920 | Box 54 \ 3 Scan264 | |
| Letter to Dr. Turner of The Lucas Electrical Co. regarding a sealing method for high liquid resistance. | 13th Aug 1929 | Box 54 \ 3 Scan265 | |
| Request to produce a set of annular spark gaps for ignition testing, based on an attached sketch. | 29th Jan 1931 | Box 54 \ 3 Scan266 | |
| Letter from Joseph Lucas Research Laboratories regarding a set of 6 concentric spark gaps. | 2nd Feb 1932 | Box 54 \ 3 Scan267 | |
| Letter to The Joseph Lucas Research Laboratories regarding gaps for testing ignition coils. | 3rd Feb 1932 | Box 54 \ 3 Scan268 | |
| Proposal to address corrosion in Swan Neck Pipes by applying a 'calorizing' treatment and testing them on experimental cars. | 6th May 1924 | Box 54 \ 4 Scan001 | |
| Issues and proposed solutions for exhaust union nuts on the 40/50 HP chassis. | 28th May 1924 | Box 54 \ 4 Scan002 | |
| Anti-corrosion treatments for exhaust parts, comparing Calorizing, Sherardizing, and Zinc Spraying. | 5th Jun 1924 | Box 54 \ 4 Scan003 | |
| Testing the Calorized process on Condor 111 exhaust pipes. | 19th Sep 1924 | Box 54 \ 4 Scan004 | |
| The necessity to calorize two steel exhaust downtake pipes. | 24th Mar 1925 | Box 54 \ 4 Scan005 | |
| The process for calorizing pipes, considering the melting point of the brazing spelter used for joints. | 25th Mar 1925 | Box 54 \ 4 Scan006 | |
| The impracticability of calorising parts with brazed joints due to the high temperatures required. | 16th Jul 1925 | Box 54 \ 4 Scan007 | |
| Challenges of calorizing brazed exhaust pipes and exploring alternatives. | 17th Jul 1925 | Box 54 \ 4 Scan008 | |
| Use of Rustless Steel pipes and testing the processes of dip brazing and calorizing. | 6th Aug 1925 | Box 54 \ 4 Scan009 | |
| Letter from The Calorizing Corporation discussing the process and challenges of calorizing down-take pipes, including issues with brazing and distortion. | 23th Jul 1925 | Box 54 \ 4 Scan010 | |
| Calorizing of 'V' series exhaust pipes, focusing on issues with welding and brazing. | 6th Aug 1925 | Box 54 \ 4 Scan011 | |
| Pipe distortion due to extreme heat and proposing Stainless Iron as a solution. | 6th Aug 1925 | Box 54 \ 4 Scan012 | |
| Letter discussing the calorizing of 'V' Series exhaust pipes and correspondence with the Calorizing Corporation of Great Britain. | 11th Aug 1925 | Box 54 \ 4 Scan013 | |
| Process and issues with calorizing 'V' Series exhaust pipes. | 13th Aug 1925 | Box 54 \ 4 Scan014 | |
| The calorizing process for 'V' Series exhaust pipes. | 24th Aug 1925 | Box 54 \ 4 Scan015 | |
| Distortion of 'V' Series exhaust pipes during the calorizing treatment. | 25th Aug 1925 | Box 54 \ 4 Scan016 | |
| Letter from The Calorizing Corporation regarding the distortion of a tube during treatment and advice for brazing flanges. | 24th Aug 1925 | Box 54 \ 4 Scan017 | |
| Request to fit a set of Hall's main bearings with white metal clearances to a B-16 unit. | 2nd Sep 1935 | Box 54 \ 4 Scan018 | |
| Sectional drawing of a Super-Atmospheric, Two-stroke cycle engine. | 2nd Sep 1935 | Box 54 \ 4 Scan019 | |
| Cross-sectional diagram of a super-atmospheric, scavenged, two-stroke cycle engine with splash lubrication. | 8th Jul 1924 | Box 54 \ 4 Scan020 | |
| Letter from E.H. Micklewood to E. Hives regarding the dispatch of an experimental engine and a follow-up visit. | 8th Jul 1924 | Box 54 \ 4 Scan021 | |
| Letter to E.H. Micklewood regarding the arrival of an engine, the making of pedestals, and the works holiday closure. | 19th Jul 1924 | Box 54 \ 4 Scan022 | |
| Requesting clarification on who will bear the costs for experimental work on the Mickelham 'Two-stroke' Engine. | 14th Aug 1924 | Box 54 \ 4 Scan023 | |
| Arrangement to test the Micklewood 2-stroke engine at the company's expense. | 15th Aug 1924 | Box 54 \ 4 Scan024 | |
| Letter from F. H. Royce to E. H. Micklewood arranging the testing of an experimental engine. | 24th Jun 1924 | Box 54 \ 4 Scan025 | |
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