| Description | Date | Identifier | |
| Test results for vehicle cabin temperature, smell, and draught under various ventilation configurations. | 22th Feb 1928 | Box 75 \ 4 scan0126 | |
| General summary of tests concerning vehicle body ventilation, internal temperatures, and air quality. | 22th Feb 1928 | Box 75 \ 4 scan0127 | |
| Test results for in-car temperatures and conditions under various ventilation settings. | 27th Apr 1915 | Box 75 \ 4 scan0128 | |
| Test data on vehicle body temperatures and airflow under various ventilation configurations. | 27th Apr 1915 | Box 75 \ 4 scan0129 | |
| Departmental memo discussing test results for a new ventilation scheme and seeking approval to proceed. | 3rd Jul 1912 | Box 75 \ 4 scan0130 | |
| Departmental memo discussing the decision not to adopt a closed dashboard in favour of an open dash for improved cooling. | 10th Jul 1912 | Box 75 \ 4 scan0131 | |
| Departmental memo regarding fitting adjustable side louvres for ventilation to the London-Edinburgh car. | 10th Jul 1912 | Box 75 \ 4 scan0132 | |
| Hand-drawn sketches of a building's front elevation and perspective view, including a detail of an open/shut mechanism. | 10th Jul 1912 | Box 75 \ 4 scan0133 | |
| Instruction to make the closed dashboard a standard feature following Mr. Royce's approval. | 10th Jul 1912 | Box 75 \ 4 scan0134 | |
| Departmental memo confirming Mr. Royce's approval to make a new ventilation scheme and closed-in dashboard standard. | 11th Jul 1912 | Box 75 \ 4 scan0135 | |
| Fitting of projecting ventilators or louvres to the scuttle of London-Edinburgh type cars. | 11th Jul 1912 | Box 75 \ 4 scan0136 | |
| Issue of mud entering the flywheel guard and a request to reduce the size of a slot. | 9th Aug 1912 | Box 75 \ 4 scan0137 | |
| Test notes for a ventilation scheme assessing engine cooling performance with and without a dash extension. | 28th Aug 1912 | Box 75 \ 4 scan0138 | |
| Design approval for the ventilation of scuttle dashes on L. to E. Cars. | 12th Sep 1912 | Box 75 \ 4 scan0139 | |
| Mr. Royce's objections to a submitted ventilator design for L to E Cars. | 28th Sep 1912 | Box 75 \ 4 scan0140 | |
| Suggestions for design modifications, including a recommendation from Mr Royce for a fan-shaped guard for doors. | 4th Oct 1912 | Box 75 \ 4 scan0141 | |
| On tests conducted to find the difference in cooling water temperature with the dashboard open and closed. | 4th Oct 1912 | Box 75 \ 4 scan0142 | |
| Sending particulars of tests carried out on the cooling system. | 15th Oct 1912 | Box 75 \ 4 scan0143 | |
| Departmental memo concerning modifications to improve airflow under the dashboard. | 19th Oct 1912 | Box 75 \ 4 scan0144 | |
| To Mr Spinney forwarding a copy of Mr Johnson's note regarding passing air under the dash. | 21th Oct 1912 | Box 75 \ 4 scan0145 | |
| Letter from F.H. Royce to Mr. Johnson giving his opinion on the ventilation arrangement for Lord Dunraven's car 1420. | 21th Oct 1912 | Box 75 \ 4 scan0146 | |
| To Mr. Spinney requesting the preparation of a scheme for ventilators in the scuttle dash for L-E Cars. | 31th Oct 1912 | Box 75 \ 4 scan0147 | |
| Cover letter for correspondence concerning scuttle dash ventilators fitted to Lord Dunraven's car. | 5th Nov 1912 | Box 75 \ 4 scan0148 | |
| Discontinuation of dashboard ventilators on Colonial cars with louvred bonnets. | 7th Nov 1912 | Box 75 \ 4 scan0149 | |
| Discontinuation of dashboard ventilators on cars fitted with louvred bonnets. | 7th Nov 1912 | Box 75 \ 4 scan0150 | |
| The discontinuation of dashboard ventilators on cars with louvred bonnets. | 7th Nov 1912 | Box 75 \ 4 scan0151 | |
| Discontinuation of dashboard ventilators on cars fitted with louvred bonnets. | 7th Nov 1912 | Box 75 \ 4 scan0152 | |
| Test report on the effects of a filled-in dashboard on vehicle temperatures and smells. | 2nd Jan 1919 | Box 75 \ 4 scan0153 | |
| Departmental memo discussing the use and positioning of dashboard ventilators on Colonial cars. | 7th Nov 1912 | Box 75 \ 4 scan0154 | |
| Departmental memo discussing alterations to a side lamp bracket and the need for dashboard ventilation. | 26th Aug 1912 | Box 75 \ 4 scan0155 | |
| Forwarding Mr Royce's note regarding ventilators for the scuttles of an L-E type car. | 9th Nov 1912 | Box 75 \ 4 scan0156 | |
| Departmental memo to Mr Barrington regarding dashboard ventilators. | 19th Nov 1912 | Box 75 \ 4 scan0157 | |
| Instruction to fit a second set of circular ventilators to an experimental car to prevent hot air from entering the front floor space. | 21th Nov 1912 | Box 75 \ 4 scan0158 | |
| Instructions for covering the front floorboards of chassis 1718 with special cork board material. | 2nd Dec 1912 | Box 75 \ 4 scan0159 | |
| Extract describing a method for ventilating front seats by slightly opening the rear-hinged front doors. | 24th Nov 1913 | Box 75 \ 4 scan0160 | |
| Special parts fitted to chassis 2100E, focusing on a proposed new method for creating bonnet louvres to improve ventilation. | 4th Dec 1912 | Box 75 \ 4 scan0161 | |
| Design for scuttle dash ventilators for L-E cars and proposing an alternative operating mechanism. | 9th Dec 1912 | Box 75 \ 4 scan0162 | |
| Continued discussion on a door mechanism involving levers and floorboards. | 23th Oct 1912 | Box 75 \ 4 scan0163 | |
| Temperature test results for a car with and without a lagged exhaust box over a 20-mile course. | 23th Oct 1912 | Box 75 \ 4 scan0164 | |
| To Mr. Spinney regarding the design of louvred undersheets for engine ventilation. | 16th Dec 1912 | Box 75 \ 4 scan0165 | |
| Operating mechanism for ventilators of the L-E Scuttle Dash. | 30th Dec 1912 | Box 75 \ 4 scan0166 | |
| Instruction regarding ventilators in the scuttle dash for L-E cars. | 30th Dec 1912 | Box 75 \ 4 scan0167 | |
| Internal memorandum forwarding a letter about overheating and requesting remarks. | 30th Jun 1913 | Box 75 \ 4 scan0168 | |
| Customer letter complaining about heat in car number 1366, attributing it to a lack of ventilators. | 30th Jun 1914 | Box 75 \ 4 scan0169 | |
| The problem of heat in the floorboards and suggestions for resolution, including the use of bonnets with shutters. | 17th Jul 1914 | Box 75 \ 4 scan0170 | |
| To Mr. Hives requesting a report on the over-heating of floorboards. | 22th Jul 1914 | Box 75 \ 4 scan0171 | |
| Log of four temperature tests performed on Ashbourne Hill under varying conditions. | 30th Aug 1908 | Box 75 \ 4 scan0172 | |
| Temperature tests on a car, comparing results with windows open versus shut, and with asbestos proofing. | 16th Mar 1908 | Box 75 \ 4 scan0173 | |
| From a heat test on Ashbourne Hill, recording footboard and water temperatures. | 24th Aug 1908 | Box 75 \ 4 scan0174 | |
| Fitting of ventilators to address heat in the fore-part of the car, including modifications for post-war models. | 15th May 1919 | Box 75 \ 4 scan0175 | |
| Delivery timelines and proposing large scuttle ventilators to address hot floorboards on a 40/50 chassis. | 26th Apr 1917 | Box 75 \ 4 scan0176 | |
| Letter concerning an overheating problem in a London-Edinburgh car and a proposed cooling modification. | 6th Sep 1912 | Box 75 \ 4 scan0177 | |
| And sketch concerning louvres for an Edinburgh type model. | 20th May 1919 | Box 75 \ 4 scan0178 | |
| Issue of heat in the front of cars and potential solutions. | 20th May 1919 | Box 75 \ 4 scan0179 | |
| The temperature of floor boards and the suggestion to use scuttle dash ventilation for cooling. | 1st Jun 1919 | Box 75 \ 4 scan0180 | |
| Methods to improve the cooling of the front seat space by addressing heat from a vacuum effect and proposing ventilation solutions. | 27th Jun 1919 | Box 75 \ 4 scan0181 | |
| Reply to Lord Herbert Scott in light of Mr. Royce's remarks. | 13th Jun 1919 | Box 75 \ 4 scan0182 | |
| Cooling of the front seat space by insulating the dashboard. | 2nd Jul 1919 | Box 75 \ 4 scan0183 | |
| Use of insulating material on the dashboard to reduce heat transfer to the front seat space. | 2nd Jul 1919 | Box 75 \ 4 scan0184 | |
| Chassis ventilation issues and upcoming wiring modifications for chassis 1.E.X. | 28th Jul 1919 | Box 75 \ 4 scan0185 | |
| Extract from Coachbuilders Conference No. 6 regarding the ventilation of the scuttle. | 8th Oct 1919 | Box 75 \ 4 scan0186 | |
| Suggestion to experimentally measure the floor temperature of a closed car to diagnose the sources of heat. | 11th Mar 1920 | Box 75 \ 4 scan0187 | |
| Complaint about excessive heat under the scuttle of the 10,000 miles trials car and proposed ventilation solutions. | 11th Mar 1920 | Box 75 \ 4 scan0188 | |
| Causes and potential solutions for fumes entering the covered bodies of cars. | 24th Apr 1920 | Box 75 \ 4 scan0189 | |
| Issue of heat coming up through the footboards into the front seats and how to address it. | 9th Jun 1922 | Box 75 \ 4 scan0190 | |
| Machining difficulties of using 25% nickel steel for components like levers and bobbins. | 25th Sep 1923 | Box 75 \ 5 scan0001 | |
| Use of 25% nickel steel versus stainless steel for a component, citing potential distortion and finish colour. | 25th Sep 1923 | Box 75 \ 5 scan0002 | |
| List of parts proposed to be made in 25% Nickel Steel. | 9th Oct 1923 | Box 75 \ 5 scan0003 | |
| Proposal to use 25% nickel steel for brake levers and the associated technical discussion against its use. | 9th Oct 1923 | Box 75 \ 5 scan0004 | |
| The color of stainless chromium steel versus 25% nickel steel for bright car parts. | 9th Oct 1923 | Box 75 \ 5 scan0005 | |
| Letter from Thos. Firth & Sons, Ltd. regarding the supply of rustless steel for brake levers, with chemical analysis and physical properties. | 4th Oct 1923 | Box 75 \ 5 scan0006 | |
| Letter discussing the properties and suitability of various steel types for components like turbine blading, brake levers, and valves. | 4th Mar 1919 | Box 75 \ 5 scan0007 | |
| Suggesting improvements for changing gear on a sliding type gearbox, using a subsidiary gear. | 4th Mar 1919 | Box 75 \ 5 scan0008 | |
| Improving gear-changing mechanisms, comparing selector gears, epicyclic gears, and sliding gears. | 1st Mar 1919 | Box 75 \ 5 scan0009 | |
| Feasibility of different gear changing mechanisms. | 11th Mar 1919 | Box 75 \ 5 scan0010 | |
| Proposed modification to a free-wheel gear arrangement using a positive jaw clutch. | 11th Mar 1919 | Box 75 \ 5 scan0011 | |
| Proposal for an experimental, electrically-operated clutch system using a combination of free wheel, jaw, and friction clutches. | 11th Mar 1919 | Box 75 \ 5 scan0012 | |
| Requesting an experimental report on a shorter change speed lever fitted to a 40/50 model car. | 21th Jun 1924 | Box 75 \ 5 scan0013 | |
| The unsuitability of a proposed rustless steel for use in 40/50 change speed levers. | 31th Oct 1923 | Box 75 \ 5 scan0014 | |
| Component list for the assembly of Chassis 1. E.X. | 30th Jun 1919 | Box 75 \ 5 scan0015 | |
| Distributing two blueprints with particulars of a chassis for the design of an Epicyclic Gear. | 21th Jul 1920 | Box 75 \ 5 scan0016 | |
| Chasing the return of a loaned Epicyclic Gear from Mr. Northey. | 12th Aug 1920 | Box 75 \ 5 scan0017 | |
| Extract listing electrical troubles experienced with imported chassis. | 19th Aug 1920 | Box 75 \ 5 scan0018 | |
| Standardisation of the epicyclic gear-case for the starter motor. | 26th Sep 1923 | Box 75 \ 5 scan0019 | |
| Standardisation of the Starter Gear in the Gear Box. | 3rd Oct 1923 | Box 75 \ 5 scan0020 | |
| Letter from S.H. Morden concerning a new patented Variable Reduction Gear and an invitation to view a model. | 22th Aug 1925 | Box 75 \ 5 scan0021 | |
| Letter to S.H. Morden Esq. requesting printed information or a patent specification for a variable reduction gear invention. | 24th Aug 1925 | Box 75 \ 5 scan0022 | |
| Letter from S.H. Morden arranging a meeting for the inventor of the Variable Reduction Gear. | 29th Sep 1925 | Box 75 \ 5 scan0023 | |
| Letter declining an appointment for the 7th instant and requesting an outline of a scheme or patent specification. | 6th Oct 1925 | Box 75 \ 5 scan0024 | |
| Proposal for a friction drive scheme using bevelled rings and spring pressure to achieve quieter engine gears. | 12th Dec 1922 | Box 75 \ 5 scan0025 | |
| Continuation page of a memorandum discussing tight gears and thick oil. | 15th Dec 1922 | Box 75 \ 5 scan0026 | |
| Tests and conclusions on engine gear noise, comparing the spring drive designs of the 20 HP and 40/50 models. | 15th Dec 1922 | Box 75 \ 5 scan0027 | |
| Investigation into engine rattles caused by a spring drive system, recommending an alternative design for the 20 HP model. | 15th Dec 1922 | Box 75 \ 5 scan0028 | |
| Comparison of bearings and drive designs on the 40/50 HP and 20 HP models. | 15th Dec 1922 | Box 75 \ 5 scan0029 | |
| Engine performance issues, including a sticking air valve, weak low-speed jet, and noisy gears. | 25th Jun 1923 | Box 75 \ 5 scan0030 | |
| Potential causes and solutions for noise and backlash in Goshawk half-time gears. | 25th Jun 1923 | Box 75 \ 5 scan0031 | |
| Proposing experiments on Goshawk 11 half-time gears to investigate the source of gear knocks. | 25th Jun 1923 | Box 75 \ 5 scan0032 | |
| Extract from a memo giving opinions on Rudge-Whitworth wire wheels and bevel pinions for the 20 HP series. | 3rd Jun 1924 | Box 75 \ 5 scan0033 | |
| The 20 HP timing gears, stating the moveable idler wheel design has not yet been approved. | 16th Aug 1927 | Box 75 \ 5 scan0034 | |
| Dimensional alterations for self-starter gear components and instructing a hold on production. | 28th Jan 1919 | Box 75 \ 5 scan0035 | |
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