| Description | Date | Identifier | |
| Requesting cars fitted with four-wheel brakes to have a red triangle at the back to warn traffic. | 19th Feb 1925 | Box 73 \ 3 scan0279 | |
| The unreliability of acceleration and four-wheel brake tests published in 'The Motor' magazine. | 19th Mar 1925 | Box 73 \ 3 scan0280 | |
| Variables and methodology for calculating acceleration and braking curves for a four-wheel brake system. | 19th Mar 1925 | Box 73 \ 3 scan0281 | |
| The variables affecting braking performance, including road surface friction and brake proportioning. | 19th Mar 1925 | Box 73 \ 3 scan0282 | |
| Braking curves, comparing theoretical principles with published car performance data. | 19th Mar 1925 | Box 73 \ 3 scan0283 | |
| Graph of braking curves for a 40/50 model, plotting road speed against stopping distance under various braking conditions. | 19th Mar 1925 | Box 73 \ 3 scan0284 | |
| Graph of braking curves showing road speed versus time to rest for a 40/50 R.R. open touring car. | 19th Mar 1925 | Box 73 \ 3 scan0285 | |
| Time-velocity curve for a 40/50 R.R. Open Touring car weighing 2.15 tons. | 26th Feb 1923 | Box 73 \ 3 scan0286 | |
| Brief memo concerning figures for four-wheel brakes provided on an attached sheet. | 24th Mar 1925 | Box 73 \ 3 scan0287 | |
| Table of braking test results for a four-wheel brake open touring car at various speeds. | 24th Mar 1925 | Box 73 \ 3 scan0288 | |
| Criticising the acceleration and braking curves published by motoring journals. | 24th Mar 1925 | Box 73 \ 3 scan0289 | |
| The inaccuracy of road test performance curves published in motor papers due to unreliable speedometers. | 21th Mar 1925 | Box 73 \ 3 scan0290 | |
| Analyzing and debunking the claimed performance data of a 45 HP Renault competitor. | 21th Mar 1925 | Box 73 \ 3 scan0291 | |
| Comparing car performance data from published tests with calculated figures and independent measurements. | 21th Mar 1925 | Box 73 \ 3 scan0292 | |
| Renault acceleration curves and associated horsepower calculations. | 21th Mar 1925 | Box 73 \ 3 scan0293 | |
| Analysis of horsepower curves and the implications for constant acceleration in a touring car engine. | 1st Mar 1925 | Box 73 \ 3 scan0294 | |
| Analyzing braking curves and criticizing flawed testing methods. | 23th Mar 1925 | Box 73 \ 3 scan0295 | |
| Brake deceleration and efficiency for the 'Vermorel' car. | 23th Mar 1925 | Box 73 \ 3 scan0296 | |
| Critiquing brake performance data and curves published in 'The Motor' magazine. | 23th Mar 1925 | Box 73 \ 3 scan0297 | |
| The inaccuracies of 'The Motor' magazine's car braking tests. | 23th Mar 1925 | Box 73 \ 3 scan0298 | |
| Time-velocity curve for a 40/50 Open Touring car, weighing 2.15 tons, compared with a 45 Renault. | 26th Feb 1923 | Box 73 \ 3 scan0299 | |
| Comparison of braking curve graphs for Delage, Vermorel, and Lagonda cars from 'The Motor' magazine. | 23th Mar 1925 | Box 73 \ 3 scan0300 | |
| Graph showing braking curves for a 40/50 model, plotting road speed against time to rest under various braking conditions. | 19th Mar 1925 | Box 73 \ 3 scan0301 | |
| Comparative velocity curve analysis for the Bentley Speed Model and the Vermorel 12-25, critiquing data from 'The Motor' magazine. | 3rd Feb 1925 | Box 73 \ 3 scan0302 | |
| Performance analysis chart for a 45 HP Renault, plotting Brake Horse Power against Engine R.P.M. | 3rd Feb 1925 | Box 73 \ 3 scan0303 | |
| Modification to prevent oil from getting onto the servo faces of front wheel brakes. | 24th Mar 1925 | Box 73 \ 3 scan0304 | |
| Correspondence regarding overheating problems with F.W.B. chassis shipped to Australia. | 2nd Apr 1925 | Box 73 \ 3 scan0305 | |
| Typed memorandum regarding an investigation into an issue with 47-AU in New Zealand. | 3rd Apr 1925 | Box 73 \ 3 scan0306 | |
| Request for the drawing number of spring balances for front brake and servo mechanism adjustment, with a handwritten reply. | 3rd Apr 1925 | Box 73 \ 3 scan0307 | |
| Carbon copy of a typed letter with handwritten instructions regarding the dispatch of drawings. | 4th Apr 1933 | Box 73 \ 3 scan0308 | |
| Clarifying that balances were made from sketches and directing the recipient to the Millwrights Dept. | 16th Apr 1925 | Box 73 \ 3 scan0309 | |
| From CJ to Wor. regarding the permanent recording of delivery dates and chassis modifications for administrative guidance. | 20th Apr 1925 | Box 73 \ 3 scan0310 | |
| Secret internal memo discussing production planning, schedules, and historical data related to various chassis series and braking systems. | 1st Apr 1925 | Box 73 \ 3 scan0311 | |
| Chassis delivery delays for the EAC engine and 20HP models, and issues with time estimates from the design department. | 12th May 1925 | Box 73 \ 3 scan0312 | |
| Accident with chassis 21-RM, detailing a known fault with 4-wheel brakes when applied while steering. | 12th May 1925 | Box 73 \ 3 scan0313 | |
| Front-wheel braking dangers, an overheating issue in Australia, and improving information distribution to officials. | 19th May 1925 | Box 73 \ 3 scan0314 | |
| The characteristics and potential variations of the four-wheel braking system. | 8th Jul 1924 | Box 73 \ 3 scan0315 | |
| Technical explanation of braking system characteristics, focusing on front brakes and semi-servo systems. | 8th Jul 1924 | Box 73 \ 3 scan0316 | |
| The operation and fault diagnosis of a servo-assisted braking system. | 8th Jul 1924 | Box 73 \ 3 scan0317 | |
| Technical note regarding braking characteristics, steering pull diagnosis, and front brake setup. | 25th May 1925 | Box 73 \ 3 scan0318 | |
| And comparing brake distribution percentages for different 4-wheel brake systems for India. | 25th May 1925 | Box 73 \ 3 scan0319 | |
| The principles of servo braking distribution and its variation with vehicle weight. | 29th Apr 1926 | Box 73 \ 3 scan0320 | |
| Letter from the Institution of Automobile Engineers enclosing a library copy of a paper on 'Four Wheel Brakes'. | 29th Apr 1926 | Box 73 \ 3 scan0321 | |
| Request for a brake leverage diagram to investigate an issue with excessive leverage on both hand and foot brakes. | 22th Jul 1926 | Box 73 \ 3 scan0322 | |
| Adjustments to front wheel braking systems, proportions, servo effectiveness, and potential overbraking. | 25th Nov 1926 | Box 73 \ 3 scan0323 | |
| Policy of retrofitting front wheel brakes to older cars. | 27th Jun 1927 | Box 73 \ 3 scan0324 | |
| Policy for handling repairs and spare parts for chassis fitted with non-standard front wheel brakes. | 23th Jun 1927 | Box 73 \ 3 scan0325 | |
| Policy on fitting front wheel brakes to pre-1923 cars. | 23th Jun 1927 | Box 73 \ 3 scan0326 | |
| The suitability of a front wheel brake model, mentioning a licensing agreement with Hotchkiss. | 23th Aug 1927 | Box 73 \ 3 scan0327 | |
| Preparation and trial of a new special speed model chassis for a 10,000 miles trial. | 19th Dec 1923 | Box 73 \ 3 scan0328 | |
| Plan to fit a new engine to the 40/50 HP chassis and the need for a test car. | 20th Dec 1923 | Box 73 \ 3 scan0329 | |
| Allocation of new 40/50 HP cars to individuals identified as PN and R. | 20th Dec 1923 | Box 73 \ 3 scan0330 | |
| The preparation of a chassis with a new engine for a 10,000-mile trial. | 20th Dec 1923 | Box 73 \ 3 scan0331 | |
| Braking systems, high-speed servo, chassis modifications for the 40/50 model, and upcoming vehicle tests. | 21th Dec 1923 | Box 73 \ 3 scan0332 | |
| Testing of new brakes for the 40/50 HP chassis and a comparison with Hispano brakes. | 28th Dec 1923 | Box 73 \ 3 scan0333 | |
| Secret memo from CJ to Hs. regarding concerns and manufacturing plans for a new engine, its relation to the Goshawk engine, and upcoming chassis tests. | 31th Dec 1923 | Box 73 \ 3 scan0334 | |
| Secret memo from Hs. regarding a trip to London for a car demonstration and discussion. | 1st Jan 1924 | Box 73 \ 3 scan0335 | |
| Letter confirming a dinner meeting and providing a delivery date for a special car. | 3rd Jan 1924 | Box 73 \ 3 scan0336 | |
| The E.A.C. engine, including test bench results and preparations for vehicle testing. | 1st Jan 1924 | Box 73 \ 3 scan0337 | |
| Engine detonation, magneto noise, and valve spring failures. | 1st Jan 1924 | Box 73 \ 3 scan0338 | |
| Missing luggage grid, resolved stiff steering, and improving brakes for an E.A. C.11 chassis. | 12th Jan 1924 | Box 73 \ 3 scan0339 | |
| Arrangement to fit a luggage grid to an experimental car. | 19th Jan 1924 | Box 73 \ 3 scan0340 | |
| The test bench results for the 3rd EAC engine, its modifications, and performance notes. | 19th Jan 1924 | Box 73 \ 3 scan0341 | |
| Ignition timing and the requirement for automatic advance on various engine models. | 9th Jan 1924 | Box 73 \ 3 scan0342 | |
| Trip-tyque for Italy and recommendations for brake testing on mountain roads. | 26th Jan 1924 | Box 73 \ 3 scan0343 | |
| Travel documents, brake components, and testing arrangements for the P.N. Experimental Car 46-PK. | 28th Jan 1924 | Box 73 \ 3 scan0344 | |
| International travel plans, brake testing, and R.A.C. formalities for experimental car 46-PK. | 28th Jan 1924 | Box 73 \ 3 scan0345 | |
| Dispatch of a Folberth Windscreen wiper for car 46-PK. | 28th Jan 1924 | Box 73 \ 3 scan0346 | |
| Testing of car EAC-11, noting the use of temporary brakes and the need for an extended engine trial. | 28th Jan 1924 | Box 73 \ 3 scan0347 | |
| Outlining arrangements for car 46-PK, including departure details, body alterations, and fitting of Ferodo linings. | 29th Jan 1924 | Box 73 \ 3 scan0348 | |
| Folberth windscreen wiper which was not fitted to a car as previously thought. | 30th Jan 1924 | Box 73 \ 3 scan0349 | |
| Signed declaration acknowledging receipt of a bonnet key for car H6 PR and the secrecy obligations associated with it. | 30th Jan 1924 | Box 73 \ 3 scan0350 | |
| Signed confidentiality undertaking regarding the key for car bonnet No. 46PK. | 30th Jan 1924 | Box 73 \ 3 scan0351 | |
| Recommendation on lubricating the universal joint inside the clutch for the PN's Trials Car 46-PK. | 12th Jul 1923 | Box 73 \ 3 scan0352 | |
| Trials car, detailing engine performance on a test bench and modifications to the camshaft and cylinder head. | 12th Jul 1923 | Box 73 \ 3 scan0353 | |
| Modifications and tests on various car components including the engine, carburettor, radiator, and clutch. | 1st Feb 1924 | Box 73 \ 3 scan0354 | |
| Car's steering, suspension, performance, vibrations, and noise. | 12th Jul 1923 | Box 73 \ 3 scan0355 | |
| Issues with vibration, brakes, clutch, steering, and engine components on a test car. | 1st Feb 1924 | Box 73 \ 3 scan0356 | |
| The difficulty of achieving consistent and equal braking on all four wheels. | 12th Jul 1923 | Box 73 \ 3 scan0357 | |
| Secret memo from Hs discussing the condition of a car, specifically its brakes and shock absorbers. | 1st Feb 1924 | Box 73 \ 3 scan0358 | |
| Letter detailing a vehicle road test from London to Abbeville, reporting on issues with brakes, power, steering, and clutch. | 9th Feb 1924 | Box 73 \ 3 scan0359 | |
| Letter reporting on vehicle performance issues with a 40/50 model and enclosing expense sheets. | 1st Feb 1926 | Box 73 \ 3 scan0360 | |
| Issues with the turning circle, condemning the use of fitted radius rods and outlining ongoing modifications. | 1st Feb 1924 | Box 73 \ 3 scan0361 | |
| Enclosing a copy of a letter from Mr. Northey describing a journey in a car with a new engine and four-wheel brakes. | 5th Feb 1924 | Box 73 \ 3 scan0362 | |
| Road test report from Paris detailing performance issues with a car's speed, steering, braking, and engine. | 3rd Feb 1924 | Box 73 \ 3 scan0363 | |
| Typed memo discussing work on servo brakes, specifically the condition of the ferodo lining. | 1st Feb 1924 | Box 73 \ 3 scan0364 | |
| Steering complaint regarding a Side Steering Tube and modified suspension geometry on a client's car. | 1st Feb 1924 | Box 73 \ 3 scan0365 | |
| The 46-PK trials car, comparing speed test results and discussing modifications for steering and bodywork. | 12th Jul 1923 | Box 73 \ 3 scan0366 | |
| Page 2 of an experimental report detailing issues with steering and braking systems. | 1st Feb 1924 | Box 73 \ 3 scan0367 | |
| The expected speed increase from a 35% increase in power. | 6th Feb 1924 | Box 73 \ 3 scan0368 | |
| The method for determining the tractive resistance of a touring car at 60 M.P.H. and over. | 26th Feb 1924 | Box 73 \ 3 scan0369 | |
| Tractive resistance and horsepower requirements for a touring car. | 12th Jul 1923 | Box 73 \ 3 scan0370 | |
| Graph of road wheel horsepower required to propel an Open Touring 40/50 car weighing 2.15 tons at various speeds. | 6th Feb 1923 | Box 73 \ 3 scan0371 | |
| Letter responding to performance issues, offering solutions for speed, pre-ignition, and braking. | 6th Feb 1924 | Box 73 \ 3 scan0372 | |
| Cover note forwarding an enclosed letter regarding PN's Trials Car. | 5th Feb 1924 | Box 73 \ 3 scan0373 | |
| Road test report from Paris to Beaune, detailing issues with the servo shoes, engine performance, clutch, and vibrations. | 5th Feb 1924 | Box 73 \ 3 scan0374 | |
| Works order for a special tube and levers for a bell crank transmission for four-wheel brakes. | 6th Feb 1924 | Box 73 \ 3 scan0375 | |
| Letter troubleshooting an inoperative servo, suggesting checks for fouling bolts and mentioning new levers have been sent. | 7th Feb 1924 | Box 73 \ 3 scan0376 | |
| Letter confirming the dispatch of a new lever to increase brake power. | 7th Feb 1924 | Box 73 \ 3 scan0377 | |
| Letter reporting on the performance and issues of a car, including engine, oil consumption, and clutch problems, during a trip in France. | 7th Feb 1924 | Box 73 \ 3 scan0378 | |
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