| Description | Date | Identifier | |
| Stating the Experimental Department does not require a second-hand body from chassis 1794. | 8th Apr 1914 | Box 74 \ 1 scan0144 | |
| Confirming that new experimental cars will have specially made bodies, precluding the use of old ones. | 15th Apr 1914 | Box 74 \ 1 scan0145 | |
| Stating a second-hand body cannot be utilized as new experimental cars will have new bodies specially made for them. | 16th Apr 1914 | Box 74 \ 1 scan0146 | |
| Solution for cars leaning to one side due to excessive weight. | 2nd Nov 1910 | Box 74 \ 1 scan0147 | |
| Suggestion to ensure car weight is the same on both sides, with a handwritten response. | 2nd Nov 1910 | Box 74 \ 1 scan0148 | |
| Cars developing a 'list' or lean due to uneven weight distribution from spare wheels, requesting contact with coachbuilders for a solution. | 4th Nov 1910 | Box 74 \ 1 scan0149 | |
| Instruction sheet requesting particulars on wheel weight, front and rear axle specifications, and camber. | 7th Nov 1910 | Box 74 \ 1 scan0150 | |
| How to advise coachbuilders on weight distribution. | 7th Nov 1910 | Box 74 \ 1 scan0151 | |
| Cause of the back axle jumping on a car after a journey to Toulon. | 4th Nov 1913 | Box 74 \ 1 scan0152 | |
| Vehicle weight distribution, focusing on the desirability of a light engine and rear-biased weight. | 4th Nov 1913 | Box 74 \ 1 scan0153 | |
| Instructing that a note on the advantage of adding weight behind the chassis centre be added to coachbuilder drawings. | 12th Nov 1913 | Box 74 \ 1 scan0154 | |
| Extract from a report on chassis No 7-CA, detailing issues with road holding and springing. | 9th Sep 1916 | Box 74 \ 1 scan0155 | |
| Expressing a negative opinion on the use of large road wheels for a chassis. | 28th Nov 1927 | Box 74 \ 1 scan0156 | |
| Negative impact of high, heavy, and wide bodies on car performance and proposing weight-saving measures. | 28th Nov 1927 | Box 74 \ 1 scan0157 | |
| Technical memorandum discussing suspension, weight distribution, and handling improvements for 20 HP and 40/50 HP models. | 14th Jan 1928 | Box 74 \ 1 scan0158 | |
| Increasing front buffer clearance and the need for ample suspension damping. | 1st Oct 1928 | Box 74 \ 1 scan0159 | |
| On car springing, ride comfort, weight distribution, and tyre selection for various models. | 1st Oct 1928 | Box 74 \ 1 scan0160 | |
| Car riding qualities, specifically the treatment of the rear end and weight distribution. | 20th Oct 1928 | Box 74 \ 1 scan0161 | |
| Improving ride comfort through suspension adjustments and reducing vibrations. | 19th Nov 1928 | Box 74 \ 1 scan0162 | |
| Responding to a query about the size of rear passenger footwells on chassis 1826E. | 19th Jun 1912 | Box 74 \ 1 scan0163 | |
| Typed letter discussing modifications to a car's boot and attaching related blueprints. | 27th Jun 1912 | Box 74 \ 1 scan0164 | |
| Follow-up memo regarding the design of footwells for rear passengers on L-E Cars. | 27th Jun 1912 | Box 74 \ 1 scan0165 | |
| Alterations for rear passenger footwells on L to E cars. | 29th Jun 1912 | Box 74 \ 1 scan0166 | |
| Results of bumping tests on spring bolts. | 30th Apr 1914 | Box 74 \ 1 scan0167 | |
| Test results table for sheared spring bolts, detailing piece numbers and time to failure. | 30th Apr 1914 | Box 74 \ 1 scan0168 | |
| Test report on the average life of spring bolts before breaking. | 12th Sep 1919 | Box 74 \ 1 scan0169 | |
| Redesign of standard bolt heads for improved accommodation, spanner sizing, and production efficiency. | 12th Sep 1919 | Box 74 \ 1 scan0170 | |
| Change in bolt manufacturing from square to round bar stock and a request to produce new bolt designs for testing. | 12th Sep 1919 | Box 74 \ 1 scan0171 | |
| List of finished experimental parts for a 40/50 Chassis. | 15th Apr 1920 | Box 74 \ 1 scan0172 | |
| Objections to riveting over bolts as recommended by the Springfield plant. | 27th Jun 1924 | Box 74 \ 1 scan0173 | |
| Calculating the stress and friction for bolts with forced-on collars. | 16th Oct 1923 | Box 74 \ 1 scan0174 | |
| The examination of a sample patent Locking Nut and Bolt. | 28th Nov 1924 | Box 74 \ 1 scan0175 | |
| Methods for attaching Ferodo lining to the car bonnet, comparing riveting versus lacing. | 5th Apr 1921 | Box 74 \ 1 scan0176 | |
| Use of Ferodo in place of brass wearing strips for bonnet and fittings. | 6th Apr 1921 | Box 74 \ 1 scan0177 | |
| Addition of Ferodo to the 40/50 chassis bonnet, considering the impact on expense and weight. | 6th Apr 1921 | Box 74 \ 1 scan0178 | |
| Method for lacing Ferodo material to a bonnet as a noise-reducing rest. | 19th Apr 1921 | Box 74 \ 1 scan0179 | |
| Experimental modification to the bonnet involving the replacement of a brass wearing strip with a Ferodo strip. | 12th May 1921 | Box 74 \ 1 scan0180 | |
| Inquiring about the standard adoption of Ferodo strip lacing for the 40/50 chassis bonnet and radiator. | 31th Aug 1922 | Box 74 \ 1 scan0181 | |
| Standardisation of Ferodo strip lacing for the 40/50 chassis bonnet. | 9th Sep 1922 | Box 74 \ 1 scan0182 | |
| Standardisation of the strip for the bonnet rest. | 18th Oct 1922 | Box 74 \ 1 scan0183 | |
| Standardisation of a Ferodo strip for bonnet rests to prevent wear and rattles. | 5th Sep 1922 | Box 74 \ 1 scan0184 | |
| Requesting the standardization of the 40/50 HP carburettor low speed jet spindle in stainless steel due to rusting issues. | 7th Jan 1922 | Box 74 \ 2 scan0001 | |
| Request to change the material of a 40/50 carburetter low-speed jet spindle from mild steel to stainless steel. | 7th Jan 1922 | Box 74 \ 2 scan0002 | |
| Standardisation sheet for a carburetter low-speed jet spindle made of stainless steel. | 28th Jan 1921 | Box 74 \ 2 scan0003 | |
| Standardisation sheet for a carburetter low-speed jet spindle in stainless steel. | 8th Jan 1921 | Box 74 \ 2 scan0004 | |
| Requesting review and signature for a standardisation sheet regarding a stainless steel carburetter low speed jet. | 7th Feb 1921 | Box 74 \ 2 scan0005 | |
| Accompanying a standardisation sheet for a carburetter low speed jet made of stainless steel. | 15th Feb 1921 | Box 74 \ 2 scan0006 | |
| Standardisation of a carburetter low-speed jet spindle to be made of stainless steel. | 28th Jan 1921 | Box 74 \ 2 scan0007 | |
| From Mr. Royce requesting the standardization of the 40/50 HP carburetter low-speed jet spindle in stainless steel. | 1st Jan 1921 | Box 74 \ 2 scan0008 | |
| Standardisation of the Low Speed Jet Spindle E.2691 from mild steel to stainless steel. | 27th Jan 1921 | Box 74 \ 2 scan0009 | |
| Corrosion of carburetter floats and the urgent need to adopt nickel plating. | 30th Mar 1921 | Box 74 \ 2 scan0010 | |
| Corrosion tests performed on carburetter floats made from different materials. | 22th Mar 1921 | Box 74 \ 2 scan0011 | |
| Instruction to nickel plate six carburetter floats for experimental testing to confirm a report on corrosion. | 31th Mar 1921 | Box 74 \ 2 scan0012 | |
| Requesting the nickel plating and polishing of six carburetter floats. | 1st Apr 1921 | Box 74 \ 2 scan0013 | |
| Supply of nickel-plated floats to address corrosion issues caused by poor quality petrol. | 9th Jun 1921 | Box 74 \ 2 scan0014 | |
| Extract from a report on the adverse effects of U.S.A. gasoline on copper carburetter parts in cars for America. | 6th Jul 1921 | Box 74 \ 2 scan0015 | |
| Effect of U.S. gasoline on copper parts, recommending nickel plating for carburetter floats. | 6th Jul 1921 | Box 74 \ 2 scan0016 | |
| Corrosion of carburetter floats and proposing nickle-plating as a solution. | 1st Sep 1921 | Box 74 \ 2 scan0017 | |
| Corrosion of carburetter floats, recommending nickel-plating and a change to brass spinnings. | 1st Sep 1921 | Box 74 \ 2 scan0018 | |
| Suggesting cathode treatment or using a different alloy to prevent air valve corrosion and sticking on 40/50 HP & 20 HP carburettors. | 7th Sep 1927 | Box 74 \ 2 scan0019 | |
| Corrosion issues and potential solutions for a Phantom air valve, comparing aluminium and brass options. | 9th Sep 1927 | Box 74 \ 2 scan0020 | |
| On the suitability of a new material for air valves and plans for testing. | 10th Sep 1927 | Box 74 \ 2 scan0021 | |
| Laboratory memo discussing metal plating options, such as nickel and zinc, for a carburettor air float. | 10th Sep 1927 | Box 74 \ 2 scan0022 | |
| Trial of new chromium and non-corrodible alloys for Phantom aluminium air valves. | 12th Sep 1927 | Box 74 \ 2 scan0023 | |
| Corrosion of a carburetter air valve on a Phantom engine and proposing material changes. | 14th Sep 1927 | Box 74 \ 2 scan0024 | |
| Letter to D. & J. Tullis Ltd. regarding the performance of 'Cindal' alloy in carburetter components. | 30th Apr 1928 | Box 74 \ 2 scan0025 | |
| Decoded cable from Springfield regarding a Pilot Jet and a request for related drawings. | 15th Jun 1921 | Box 74 \ 2 scan0026 | |
| Request from Springfield for drawings of a Pilot Jet. | 24th Jun 1921 | Box 74 \ 2 scan0027 | |
| The adoption of a pilot jet for easy starting and comparison with existing choker schemes. | 28th Jun 1921 | Box 74 \ 2 scan0028 | |
| Describing a new auxiliary pilot jet, its installation, function, and advantages over the one fitted to the 6.EX Car. | 23th Aug 1921 | Box 74 \ 2 scan0029 | |
| Continuation page listing the benefits of a change, such as a more positive start and simpler controls. | 23th Aug 1921 | Box 74 \ 2 scan0030 | |
| Issues found during tests of a pilot jet on a 40/50 engine, particularly concerning cold starting. | 13th Sep 1921 | Box 74 \ 2 scan0031 | |
| The development and testing of adjustable venturi, throttle, and pilot jet systems. | 9th Sep 1921 | Box 74 \ 2 scan0032 | |
| Revisions made to the Goshawk 11 carburetter to prevent flooding when on a gradient. | 5th Oct 1921 | Box 74 \ 2 scan0033 | |
| Confirmation of a telegram regarding the slow running performance of a Goshawk Two engine. | 5th Oct 1921 | Box 74 \ 2 scan0034 | |
| Extract detailing the design of a pilot jet, automatic valve, and silencer for the Goshawk carburetter. | 8th Oct 1921 | Box 74 \ 2 scan0035 | |
| Defects of existing carburettors and starting devices and proposing a new modification. | 10th Oct 1921 | Box 74 \ 2 scan0036 | |
| Continued letter discussing modifications to the carburetter and induction system. | 10th Oct 1921 | Box 74 \ 2 scan0037 | |
| Decoded cablegram confirming a message about a vaporizing scheme for cars in winter conditions. | 12th Oct 1921 | Box 74 \ 2 scan0038 | |
| Second page of correspondence to the American branch detailing decoded cable messages. | 27th Oct 1921 | Box 74 \ 2 scan0039 | |
| Cablegram discussing the successful testing of vaporizer pipes and a modified pilot jet for good cold starting. | 27th Oct 1921 | Box 74 \ 2 scan0040 | |
| Cablegram to Mr. Hives about testing a pilot jet and vaporizing scheme on cars. | 14th Oct 1921 | Box 74 \ 2 scan0041 | |
| Summary of cable correspondence with Springfield concerning the American Programme, specifically pilot jet and vaporizing scheme performance. | 31th Oct 1921 | Box 74 \ 2 scan0042 | |
| Induction pipe changes and solutions for cold starting issues in American cars. | 1st Nov 1921 | Box 74 \ 2 scan0043 | |
| Comparison of a vaporiser scheme with an exhaust heated throttle, weighing performance benefits against production viability and cost. | 23th Sep 1921 | Box 74 \ 2 scan0044 | |
| Report from the Engineering Committee on engine improvements for winter conditions and fuel conservation. | 2nd Nov 1921 | Box 74 \ 2 scan0045 | |
| Requesting cost information for a standardisation sheet related to an experiment replacing a primer with a pilot jet on an induction pipe. | 2nd Nov 1921 | Box 74 \ 2 scan0046 | |
| Historical summary of development on the Pilot Jet to address issues with starting cars from cold in America. | 9th Nov 1921 | Box 74 \ 2 scan0047 | |
| Summary of communications between Derby and Springfield regarding suggestions for improving winter starting. | 14th Nov 1921 | Box 74 \ 2 scan0048 | |
| Cold starting issues in the U.S.A. and a telegram from Springfield about testing a small pilot jet. | 15th Nov 1921 | Box 74 \ 2 scan0049 | |
| Letter discussing modifications and performance of vaporizer pipes and pilot jets, including issues with cold starts and smoke. | 15th Nov 1921 | Box 74 \ 2 scan0050 | |
| Technical report discussing issues with fuel collectors, vaporizers, and induction pipes to improve engine performance and reduce smoking. | 15th Nov 1921 | Box 74 \ 2 scan0051 | |
| Carburetor pilot jet modifications for improved cold starting and engine running. | 15th Nov 1921 | Box 74 \ 2 scan0052 | |
| Letter discussing the experimental design and proposed winter testing of a new priming jet system and its operating mechanism. | 15th Nov 1921 | Box 74 \ 2 scan0053 | |
| Requesting the cost to fit a 'Starting from Cold in U.S.A.' appliance to an existing car, with a handwritten response. | 21th Nov 1921 | Box 74 \ 2 scan0054 | |
| Experiment fitting a pilot jet on the induction pipe to replace the primer, requesting review of the standardisation sheet. | 22th Nov 1921 | Box 74 \ 2 scan0055 | |
| Requesting the setup of experimental sets for an induction pipe on a 40/50 chassis. | 22th Nov 1921 | Box 74 \ 2 scan0056 | |
| Requesting the return of two standardisation sheets with remarks. | 13th Dec 1921 | Box 74 \ 2 scan0057 | |
| Design, adjustments, and operation of a starting carburetter for the 40/50 HP chassis. | 16th Dec 1921 | Box 74 \ 2 scan0058 | |
| Technical note discussing engine cold starting performance, comparing different car models, fuel types, and carburetter pilot jets. | 16th Dec 1921 | Box 74 \ 2 scan0059 | |
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