| Description | Date | Identifier | |
| Usefulness of a battery charge indicator instrument compared to a green lamp system. | 23th Jul 1928 | Box 54 \ 2 Scan238 | |
| Patronage and safety concerns of a third-party battery indicator. | 23th Jul 1928 | Box 54 \ 2 Scan239 | |
| Query from motor agents regarding a customer's request to fit a Battery Capacity Ampere Hour Meter and its potential impact on the car's guarantee. | 6th Jul 1929 | Box 54 \ 2 Scan240 | |
| Letter to Messrs. McNeill & Co. discussing the limitations and usefulness of battery capacity meters. | 9th Jul 1929 | Box 54 \ 2 Scan241 | |
| Letter to Messrs. McNeill & Co. regarding the fitting of a low-amperage instrument. | 9th Jul 1929 | Box 54 \ 2 Scan242 | |
| From EFC to Roy declining to experimentally consider meters from Messrs. J.H. Wedge & Co. | 27th Jul 1929 | Box 54 \ 2 Scan243 | |
| 48 coil medium output P.2 dynamo and battery capacity meters. | 20th Jan 1931 | Box 54 \ 2 Scan244 | |
| Blueprints for a 1100 lb rear road spring sample test. | 15th Mar 1921 | Box 54 \ 3 Scan001 | |
| Side movement and twisting of rear spring leaves without nibs and slots on a test chassis. | 16th Mar 1921 | Box 54 \ 3 Scan002 | |
| Addition of clips to pre-war rear road springs to counteract torsion and translation forces. | 16th Mar 1921 | Box 54 \ 3 Scan003 | |
| The modification of chassis springs by adding an extra pair of clips. | 19th Mar 1921 | Box 54 \ 3 Scan004 | |
| Issues with front springs on cars, including loose clips and shearing bolts. | 31th Mar 1921 | Box 54 \ 3 Scan005 | |
| Fixing front springs to the front axle, identifying loose spring clips as the cause for broken bolts. | 1st Apr 1921 | Box 54 \ 3 Scan006 | |
| Use of cast hardened mild steel versus nickel steel for wearing plates on rear springs. | 10th Dec 1920 | Box 54 \ 3 Scan007 | |
| Complaint about loose front spring clips and breakage of centre bolts on new cars. | 14th Apr 1921 | Box 54 \ 3 Scan008 | |
| Page discussing the final testing and inspection of work at coachbuilders. | 10th Feb 1931 | Box 54 \ 3 Scan009 | |
| Noise complaints due to excessive end play in front spring shackles. | 6th Apr 1921 | Box 54 \ 3 Scan010 | |
| Issues and performance of thick versus thin leaved springs for cars in the American market. | 7th Apr 1921 | Box 54 \ 3 Scan011 | |
| Reconstructing a carriage, salvaging the top plate, and scrapping the remaining leaves for their valuable steel. | 7th Apr 1921 | Box 54 \ 3 Scan012 | |
| Agreeing with a suggestion to use hardened washers to reduce wear on front springs or shackles. | 10th May 1921 | Box 54 \ 3 Scan013 | |
| Lubrication issues with rear spring shackles and proposing improvements. | 10th May 1921 | Box 54 \ 3 Scan014 | |
| The importance of better lubricators and lubrication schemes for shackles, and the method for initial oiling. | 8th Jun 1921 | Box 54 \ 3 Scan015 | |
| Extract discussing causes and solutions for transmission knocking, particularly in relation to U.S.A. complaints. | 8th Jun 1921 | Box 54 \ 3 Scan016 | |
| Page discussing the causes of knock in the transmission, specifically uneven engine firing, and proposing solutions. | 8th Jun 1921 | Box 54 \ 3 Scan017 | |
| Modifications to rear springs, including changing the front-end mounting and fitting black-lead bushings. | 22th Jun 1921 | Box 54 \ 3 Scan018 | |
| The modification of rear road spring bearings to use 'Alemite' grease lubricators. | 5th Jul 1921 | Box 54 \ 3 Scan019 | |
| The company's policy on thick versus thin leaf springs and customer pricing. | 4th Aug 1921 | Box 54 \ 3 Scan020 | |
| Test report on a front bumper chassis, logging running hours and component failures. | 12th Jul 1921 | Box 54 \ 3 Scan021 | |
| Log sheet detailing component failures and observations during a vehicle test run. | 19th Aug 1921 | Box 54 \ 3 Scan022 | |
| The durability testing of American-manufactured front springs against standard Woodhead springs for the 4.EX car. | 1st Aug 1921 | Box 54 \ 3 Scan023 | |
| Complaints about squeaking rear springs. | 10th Aug 1921 | Box 54 \ 3 Scan024 | |
| Permanent fix for squeaking thick leaf springs by filing the leaf edges. | 8th Aug 1921 | Box 54 \ 3 Scan025 | |
| Inspection for chassis 46-RE and an update on its leaf springs. | 18th Aug 1921 | Box 54 \ 3 Scan026 | |
| Request to alter the springs on a pre-war car, chassis 5-RD, to match those of a post-war car, 95AG. | 18th Jun 1921 | Box 54 \ 3 Scan027 | |
| Follow-up memo requesting a reply to a suggestion about squeaking rear springs. | 26th Aug 1921 | Box 54 \ 3 Scan028 | |
| Suspension upgrades due to cord tyres and addressing complaints about axle and gearbox noise on Rudyard Kipling's car. | 31th Aug 1921 | Box 54 \ 3 Scan029 | |
| Continued memo discussing the need to resolve a chassis issue to maintain standards and avoid customer annoyance. | 31th Aug 1921 | Box 54 \ 3 Scan030 | |
| The development and testing of experimental road springs for the Goshawk 11 engine project. | 12th Sep 1921 | Box 54 \ 3 Scan031 | |
| Timeline of events concerning the ordering and testing of experimental springs and a subsequent dispute. | 12th Sep 1921 | Box 54 \ 3 Scan032 | |
| Delays and calculations for ordering experimental and production springs. | 12th Sep 1921 | Box 54 \ 3 Scan033 | |
| Permanent cure for squeaking thick leaf springs by rounding off the ends of the leaves. | 13th Sep 1921 | Box 54 \ 3 Scan034 | |
| Experiments on rounding the surfaces of thick leaf springs to cure squeaking. | 19th Sep 1921 | Box 54 \ 3 Scan035 | |
| Reporting on the superior test results of American-supplied front springs over Woodhead Springs. | 20th Sep 1921 | Box 54 \ 3 Scan036 | |
| Laboratory analysis of 'Very good American Spring No. 2', detailing its chemical composition and Brinell hardness. | 7th Sep 1921 | Box 54 \ 3 Scan037 | |
| Letter detailing a successful cure for squeaking thick leaf springs. | 30th Sep 1921 | Box 54 \ 3 Scan038 | |
| Complaints about thick leaf springs and the proposed solution of using thinner, stiffer, unlubricated springs to improve ride steadiness. | 3rd Oct 1921 | Box 54 \ 3 Scan039 | |
| Supply and pricing of road springs from Firths' new plant in comparison to American prices. | 3rd Oct 1921 | Box 54 \ 3 Scan040 | |
| Tests to cure squeaking in thick leaf springs by forming a radius on the leaf edges. | 28th Sep 1921 | Box 54 \ 3 Scan041 | |
| The cost of changing rear springs from a thick leaf to a thin leaf type. | 6th Oct 1921 | Box 54 \ 3 Scan042 | |
| Results of tests on squeaking thick leaf springs and the effect of radiusing the edges. | 1st Oct 1921 | Box 54 \ 3 Scan043 | |
| Customer complaints and preferences regarding thick versus thin leaf springs on 40/50 HP chassis. | 10th Oct 1921 | Box 54 \ 3 Scan044 | |
| Vehicle springing, customer complaints regarding ride comfort, and ideal solutions involving friction dampers. | 7th Oct 1921 | Box 54 \ 3 Scan045 | |
| The challenges and complaints related to fitting shock absorbers and a recommendation for using thin leaf springs. | 10th Oct 1921 | Box 54 \ 3 Scan046 | |
| Report discussing complaints about leaf spring friction and potential solutions for vehicle suspension. | 7th Oct 1921 | Box 54 \ 3 Scan047 | |
| Springing and shock damper design for the 40/50 HP model. | 18th Oct 1921 | Box 54 \ 3 Scan048 | |
| Continued discussion regarding the lubrication of shock dampers and connections. | 18th Oct 1921 | Box 54 \ 3 Scan049 | |
| Potential purchase of Hartford Shock Absorbers to address complaints about thick leaf springs. | 1st Oct 1921 | Box 54 \ 3 Scan050 | |
| Quote for Hartford shock absorbers as an alternative for the Goshawk. | 1st Oct 1921 | Box 54 \ 3 Scan051 | |
| Letter from Madrid regarding client complaints about engine overheating and suspension issues. | 5th Nov 1921 | Box 54 \ 3 Scan052 | |
| Implementation and challenges of fitting shock dampers to post-war cars. | 23th Nov 1921 | Box 54 \ 3 Scan053 | |
| Shock damper performance, future policy, and competing engineering priorities such as engines and armoured cars. | 23th Nov 1921 | Box 54 \ 3 Scan054 | |
| Continued memo about increasing the wearing surface of a fitting via lubrication with 'Enot' greasing equipment. | 10th Dec 1920 | Box 54 \ 3 Scan055 | |
| Squeaks from spring shackles due to lack of lubrication and suggesting a design modification. | 23th Nov 1921 | Box 54 \ 3 Scan056 | |
| The lubrication of spring shackles and squeaking springs, referencing a solution implemented on a car belonging to Rudyard Kipling. | 29th Nov 1921 | Box 54 \ 3 Scan057 | |
| The policy and technical merits of fitting thin leaf springs versus Hartford shock dampers to a chassis. | 15th Dec 1921 | Box 54 \ 3 Scan058 | |
| Crankcase fumes, sea-sickness, and suspension design including springs and shock-dampers. | 20th Dec 1921 | Box 54 \ 3 Scan059 | |
| Page detailing an escalation procedure for unsatisfactory explanations. | 20th Dec 1921 | Box 54 \ 3 Scan060 | |
| Composition, design, and performance of road springs. | 30th Dec 1921 | Box 54 \ 3 Scan061 | |
| Increasing stock of thick leaf rear springs for the 40/50 HP Chassis and proposing a policy review. | 2nd Jan 1922 | Box 54 \ 3 Scan062 | |
| Letter from Paris discussing two new articles: a front spring shackle and a variable speed fan. | 31th Jan 1922 | Box 54 \ 3 Scan063 | |
| Letter discussing adjustable spring shackles, a variable speed fan, shutters, and an automatic steam carburettor. | 8th Feb 1922 | Box 54 \ 3 Scan064 | |
| Rear spring issues and the recommendation to fit Hartford pattern double-acting shock dampers. | 10th Feb 1922 | Box 54 \ 3 Scan065 | |
| Fitting of shock dampers and flexible springs for optimal damping effect. | 14th Feb 1922 | Box 54 \ 3 Scan066 | |
| Letter regarding the forwarding of patent spring shackles for evaluation and potential adoption. | 14th Feb 1922 | Box 54 \ 3 Scan067 | |
| Solution for squeaks from thick leaf springs by modifying the leaf tips. | 14th Mar 1922 | Box 54 \ 3 Scan068 | |
| Manufacturing difficulties and design considerations for front springs. | 10th May 1922 | Box 54 \ 3 Scan069 | |
| Ongoing customer complaints about squeaks from thick leaf springs and engine vibration. | 9th May 1922 | Box 54 \ 3 Scan070 | |
| Value of thick leaf rear springs and the suitability of thin leaf springs for the 40/50-HP Chassis. | 24th May 1922 | Box 54 \ 3 Scan071 | |
| Value, stock, and performance of thick and thin leaf rear springs for the 40/50 chassis. | 25th May 1922 | Box 54 \ 3 Scan072 | |
| Scrapping thick leaf rear and front springs for the 40/50 HP chassis. | 26th May 1922 | Box 54 \ 3 Scan073 | |
| Instruction to immediately cease using and scrap the existing stock of thick leaf springs. | 30th May 1922 | Box 54 \ 3 Scan074 | |
| The decision to cease fitting thick leaf springs to chassis and what to do with the excess stock. | 30th May 1922 | Box 54 \ 3 Scan075 | |
| Correcting a pricing error for 40/50 chassis thick leaf springs. | 30th May 1922 | Box 54 \ 3 Scan076 | |
| The performance and testing of patent spring shackles. | 29th Jun 1922 | Box 54 \ 3 Scan077 | |
| Merits of thin versus thick leaf road springs and recommending rounding the edges. | 10th Jul 1922 | Box 54 \ 3 Scan078 | |
| Request to investigate the harshness and vibration of the front of the 40/50 model. | 1st Jul 1922 | Box 54 \ 3 Scan079 | |
| Confirming arrangements for testing different axle springs on 40/50 HP and Goshawk models. | 26th Jul 1922 | Box 54 \ 3 Scan080 | |
| Replacing thick leaf rear springs with thin leaf springs and Hartford shock dampers. | 1st Aug 1922 | Box 54 \ 3 Scan081 | |
| The adoption of thin leaf springs and shock absorbers for American and English production cars. | 1st Sep 1922 | Box 54 \ 3 Scan082 | |
| Tests for spring shackles and bushes, recommending the use of hardened surfaces over phosphor bronze. | 11th Sep 1922 | Box 54 \ 3 Scan083 | |
| Request to manufacture pieces for a small spring testing apparatus, referring to drawing No. LeC.1637. | 3rd Oct 1922 | Box 54 \ 3 Scan084 | |
| Requesting the manufacture of parts for a spring testing apparatus, referencing drawing No.LeC.1638. | 10th May 1922 | Box 54 \ 3 Scan085 | |
| Adjustment of car springs and shock dampers for models intended for use abroad on rough roads. | 16th Oct 1922 | Box 54 \ 3 Scan086 | |
| Modifications to spring clearances and strength for a 40/50 HP chassis intended for export. | 19th Oct 1922 | Box 54 \ 3 Scan087 | |
| Improvements and stock management for road springs on 40/50 and Goshawk cars. | 23th Oct 1922 | Box 54 \ 3 Scan088 | |
| The merits and costs of thick leaf springs versus thin leaf springs and shock absorbers for the 40/50 model. | 26th Oct 1922 | Box 54 \ 3 Scan089 | |
| Page discussing conclusions on leaf springs, shock dampers, and tyre pressures. | 26th Oct 1922 | Box 54 \ 3 Scan090 | |
| 5% increase in spring poundage for chassis intended for overseas use. | 26th Oct 1922 | Box 54 \ 3 Scan091 | |
| Recommending the use of hardened steel washers to reduce noise from spring shackles and front horns. | 6th Nov 1922 | Box 54 \ 3 Scan092 | |
| From Da. to Hs. discussing design considerations for spring shackles, models X.2628 and X.4261. | 12th Dec 1922 | Box 54 \ 3 Scan093 | |
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