| Description | Date | Identifier | |
| Report detailing issues with brakes and engine overheating during mountain driving. | 2nd Feb 1924 | Box 73 \ 3 scan0379 | |
| Ineffective brakes, excessive servo wear, and lower than expected top speed for trials car 46-PK. | 2nd Feb 1924 | Box 73 \ 3 scan0380 | |
| Continued note discussing the disappointing maximum speeds of the Hawk-Northcliffe engine compared to the EAC engine. | 8th Feb 1924 | Box 73 \ 3 scan0381 | |
| Letter suggesting troubleshooting steps to address the low maximum speed of car 46-PK. | 8th Feb 1924 | Box 73 \ 3 scan0382 | |
| Letter from Cannes reporting a slipping clutch and requesting additional funds for expenses. | 9th Feb 1924 | Box 73 \ 3 scan0383 | |
| Secret internal memorandum discussing design suggestions for the E.A.C. engine. | 9th Feb 1924 | Box 73 \ 3 scan0384 | |
| C.J. to Hs. forwarding a copy of a further report from P.N. | 2nd Feb 1924 | Box 73 \ 3 scan0385 | |
| Typed memo from Cannes detailing a car's performance over the Col de la Croix Haute and required mechanical adjustments. | 9th Feb 1924 | Box 73 \ 3 scan0386 | |
| Forwarding a copy of a letter concerning car PN being driven to the south of France. | 12th Feb 1924 | Box 73 \ 3 scan0387 | |
| Commentary on PN's car, comparing its engine, steering, clutch, and brakes with other models. | 9th Feb 1924 | Box 73 \ 3 scan0388 | |
| The concluding page of a letter signed by F.H. Royce concerning an individual named PN and their car. | 13th Feb 1924 | Box 73 \ 3 scan0389 | |
| Letter discussing fuel mixture performance, a servo lever fault with a sketch, and brake adjustments. | 13th Feb 1924 | Box 73 \ 3 scan0390 | |
| Letter detailing the testing of a car, focusing on performance issues with brakes, clutch springs, and coachwork fittings. | 2nd Apr 1907 | Box 73 \ 3 scan0391 | |
| 'CJ' enclosing a copy of a letter from 'PN' regarding an experimental car in the South of France. | 11th Feb 1924 | Box 73 \ 3 scan0392 | |
| Typed report on the comparison testing of an experimental car and a Riviera model, focusing on engine, brake, and axle performance. | 11th Feb 1924 | Box 73 \ 3 scan0393 | |
| Competitor's engine acceleration. | 1st Feb 1924 | Box 73 \ 3 scan0394 | |
| Secret memorandum regarding issues with a car's servo and proportionate braking system. | 15th Feb 1924 | Box 73 \ 3 scan0395 | |
| Internal memorandum from CJ to multiple recipients forwarding a copy of a letter from PN. | 14th Feb 1924 | Box 73 \ 3 scan0396 | |
| Typed letter from Cannes discussing car performance, road tests, and potential sales. | 14th Feb 1924 | Box 73 \ 3 scan0397 | |
| Chassis delay, a high-speed servo, a seized reverse-pinion, and other test updates. | 16th Feb 1924 | Box 73 \ 3 scan0398 | |
| Letter regarding a new brake lever with increased servo and a query about faulty carburation on a 40/50 HP model. | 18th Feb 1924 | Box 73 \ 3 scan0399 | |
| Car skidding into a ditch, the seizure of the reverse pinion, and the subsequent repair work. | 18th Feb 1924 | Box 73 \ 3 scan0400 | |
| Letter discussing car usage by Mr. Northey, expenses, and a personal request to travel due to a family emergency. | 19th Feb 1924 | Box 73 \ 3 scan0401 | |
| Examining steering shocks on an experimental car and proposing spring modifications. | 19th Feb 1924 | Box 73 \ 3 scan0402 | |
| Internal routing slip from CJ distributing a copy of a further report from PN. | 2nd Feb 1924 | Box 73 \ 3 scan0403 | |
| Secret memo detailing the steering setup on a specific car following steering failures during a bump test. | 20th Feb 1924 | Box 73 \ 3 scan0404 | |
| Typed memo detailing car performance comparisons and mechanical issues in France. | 16th Feb 1924 | Box 73 \ 3 scan0405 | |
| Letter from F. H. Royce to C.J. regarding performance issues with PN's experimental car. | 20th Feb 1924 | Box 73 \ 3 scan0406 | |
| Letter detailing brake lever modifications and diagnosing a carburation fault based on engine behaviour. | 21th Feb 1924 | Box 73 \ 3 scan0407 | |
| Vehicle performance, maintenance adjustments, and comparative acceleration tests. | 21th Feb 1924 | Box 73 \ 3 scan0408 | |
| Test drive report on an experimental car, focusing on the performance of its brakes and clutch. | 21th Feb 1924 | Box 73 \ 3 scan0409 | |
| Vehicle performance and component feedback after a road test. | 24th Feb 1924 | Box 73 \ 3 scan0410 | |
| Car's mileage, behavior, wear on servo shoe liners, and part fitment. | 24th Feb 1924 | Box 73 \ 3 scan0411 | |
| Letter discussing engine running issues, including erratic carburetion and misfiring, and proposing maintenance. | 28th Feb 1926 | Box 73 \ 3 scan0412 | |
| Letter providing a performance report on a car after a 600-700 mile drive. | 28th Feb 1926 | Box 73 \ 3 scan0413 | |
| Vehicle performance, noting issues with the brakes and spark plugs. | 4th Mar 1924 | Box 73 \ 3 scan0414 | |
| Internal memorandum discussing potential improvements and alternatives for clutch design. | 4th Mar 1924 | Box 73 \ 3 scan0415 | |
| Methods for making a clutch brake and the necessity of having one ready. | 6th Mar 1924 | Box 73 \ 3 scan0416 | |
| Car's condition and journey from Monte Carlo, detailing brake adjustments and mileage. | 6th Mar 1924 | Box 73 \ 3 scan0417 | |
| Correspondence regarding a journey to England and enclosing expense sheets. | 1st Apr 1924 | Box 73 \ 3 scan0418 | |
| Secret memo discussing E.A.C. engine mounting variations, correcting a previous statement and detailing retard vibration issues. | 1st Apr 1924 | Box 73 \ 3 scan0419 | |
| Secret internal memo regarding the E.A.C. engine mounting, discussing design variations and vibration issues. | 1st Apr 1924 | Box 73 \ 3 scan0420 | |
| Taking a 40/50 HP model with a 4-wheel brake system to the Grand Prix and its preparation. | 17th Jun 1924 | Box 73 \ 3 scan0421 | |
| Secret memo discussing car modifications for the Grand Prix and options for other available models. | 18th Jun 1924 | Box 73 \ 3 scan0422 | |
| Typed memo discussing the repainting of car parts and the allocation of a specific vehicle. | 19th Jun 1924 | Box 73 \ 3 scan0423 | |
| Selecting a 40/50 HP car with new four-wheel brakes for a press demonstration in France for the Grand Prix. | 19th Jun 1924 | Box 73 \ 3 scan0424 | |
| Secret memo regarding a car being prepared for the French Grand Prix and for Press runs. | 25th Jun 1924 | Box 73 \ 3 scan0425 | |
| Car arrangements for a trip to France, discussing vehicle specifications and the opportunity to test stronger springs. | 23th Jul 1924 | Box 73 \ 3 scan0426 | |
| Forwarding the first three daily reports for a F.W.B. Cabriolet on trial in France. | 22th Aug 1924 | Box 73 \ 3 scan0427 | |
| Road test report from J. H. Henning detailing a journey to Paris and the performance of the vehicle. | 17th Aug 1924 | Box 73 \ 3 scan0428 | |
| Road test report from J.H. Henning on a journey from Paris. | 18th Aug 1924 | Box 73 \ 3 scan0429 | |
| Test drive report from France detailing vehicle performance on hills and in wet weather. | 19th Aug 1924 | Box 73 \ 3 scan0430 | |
| Front spring failure which caused an accident to a 48-PK car in France. | 2nd Sep 1924 | Box 73 \ 3 scan0431 | |
| Vehicle's braking issues, noting a pull to the right after spring replacement. | 20th Mar 1924 | Box 73 \ 3 scan0432 | |
| Accident report concluding a broken spring centre bolt was the cause, not the 4-wheel brakes. | 27th Aug 1924 | Box 73 \ 3 scan0433 | |
| Diagram illustrating a broken centre bolt on a front spring assembly. | 27th Aug 1924 | Box 73 \ 3 scan0434 | |
| Diagram illustrating the failure of a broken centre bolt on a front spring assembly. | 27th Aug 1924 | Box 73 \ 3 scan0435 | |
| Enclosed report from Mr. Lockington on carriagebuilding. | 2nd Jan 1908 | Box 74 \ 1 scan0001 | |
| Confidential memo regarding the termination of Barker's contract and the plan to take up in-house carriagebuilding. | 3rd Dec 1908 | Box 74 \ 1 scan0002 | |
| Request for building running costs including lighting, heating, ground rent, and depreciation. | 16th Dec 1908 | Box 74 \ 1 scan0003 | |
| Letter responding to queries about building costs, including lighting, heating, ground rent and depreciation. | 17th Dec 1908 | Box 74 \ 1 scan0004 | |
| Cost analysis and expenditure report for Heating and Lighting at the Derby Works. | 17th Dec 1908 | Box 74 \ 1 scan0005 | |
| Letter from Hill Bros to Claude Johnson requesting information on insurance premiums and rates for buildings. | 21th Dec 1908 | Box 74 \ 1 scan0006 | |
| Letter outlining the particulars for a manufactory to build 100 motor bodies per annum. | 31th Dec 1908 | Box 74 \ 1 scan0007 | |
| Report cover page regarding a manufactory to build 100 motor bodies per annum. | 3rd Dec 1908 | Box 74 \ 1 scan0008 | |
| Financial summary detailing the costs for establishing a works, including building, materials, and labor, along with projected sales and profit. | 3rd Dec 1908 | Box 74 \ 1 scan0009 | |
| Breakdown of capital expenditure and working capital required. | 3rd Dec 1908 | Box 74 \ 1 scan0010 | |
| Dimensional breakdown and cost estimate for factory buildings and workshops. | 3rd Dec 1908 | Box 74 \ 1 scan0011 | |
| Summary of the value of plant equipment and materials, categorised by department and type. | 3rd Dec 1908 | Box 74 \ 1 scan0012 | |
| Breakdown of estimated weekly wages for producers and non-producers. | 3rd Dec 1908 | Box 74 \ 1 scan0013 | |
| Estimated cost and sales projection for the production of 100 car bodies per annum. | 5th Jan 1909 | Box 74 \ 1 scan0014 | |
| Quantities of different car body styles and a list of queries regarding production costs. | 5th Jan 1909 | Box 74 \ 1 scan0015 | |
| Outlining business costs, expenditures, and pricing queries. | 6th Jan 1909 | Box 74 \ 1 scan0016 | |
| Letter from Thos. S. L. Lockington acknowledging the receipt of payment for a report on the Carnall Building. | 6th Jan 1909 | Box 74 \ 1 scan0017 | |
| Letter to Claude Johnson regarding the cost and profit calculation for car bodies and extra items. | 14th Jan 1909 | Box 74 \ 1 scan0018 | |
| Letter discussing the capital requirements and potential profits for building car bodies in-house. | 19th Jan 1909 | Box 74 \ 1 scan0019 | |
| Financial report from Ernest A Claremont Esq. detailing required ground, capital, and projected costs and profits for a project. | 19th Jan 1909 | Box 74 \ 1 scan0020 | |
| Strategic decision of whether to engage in carriage building or focus solely on chassis production. | 19th Jan 1909 | Box 74 \ 1 scan0021 | |
| Letter to Ernest A. Claremont Esq discussing a descending scale of prices for car bodies and arrangements with various coachbuilders. | 5th Feb 1910 | Box 74 \ 1 scan0022 | |
| The design issues of the Monte Carlo Car's splashers and windscreen, including comparative wing dimensions of other models. | 5th Feb 1910 | Box 74 \ 1 scan0023 | |
| Letter discussing the unsatisfactory condition of a trials car's body and seats, with recommendations for improved rims and tyres. | 6th Jun 1910 | Box 74 \ 1 scan0024 | |
| Letter to Claude Johnson regarding the issues with studded tyres and the preference for an old, comfortable car body over a finished one. | 6th Jun 1910 | Box 74 \ 1 scan0025 | |
| Letter from C.S. Rolls to C.J. regarding the quality of car bodywork and suggesting an in-house body department. | 12th Jul 1910 | Box 74 \ 1 scan0026 | |
| Difficulties in perfecting coachwork, contrasting the artistic nature of bodywork with the mechanical nature of chassis construction. | 14th Jul 1910 | Box 74 \ 1 scan0027 | |
| Departmental memo discussing the company's coachwork strategy, comparing English and French suppliers, and outlining future design improvement plans. | 14th Jul 1910 | Box 74 \ 1 scan0028 | |
| Coachwork design improvements, successful past models, and future body design strategy. | 10th Jun 1910 | Box 74 \ 1 scan0029 | |
| Difficulties and potential benefits of establishing an in-house coachbuilding factory. | 10th Jun 1910 | Box 74 \ 1 scan0030 | |
| Continuation page discussing the financial unviability of undertaking in-house bodywork for the company's high-class chassis. | 10th Jun 1910 | Box 74 \ 1 scan0031 | |
| Letter discussing body alterations and the design and ventilation of car seat cushions. | 12th Aug 1910 | Box 74 \ 1 scan0032 | |
| Letter discussing vehicle shock absorber settings and a comparison of a proposed spring system against the Lanchester patent. | 12th Aug 1910 | Box 74 \ 1 scan0033 | |
| Departmental memo outlining actions and communications regarding car cushions. | 15th Aug 1910 | Box 74 \ 1 scan0034 | |
| List of suggestions for coachbuilders regarding vehicle design and fittings. | 24th Aug 1910 | Box 74 \ 1 scan0035 | |
| Advice regarding removable side doors to combat excess engine heat in warm weather. | 8th Sep 1910 | Box 74 \ 1 scan0036 | |
| Use of aluminium for metal roofs on car bodies. | 1st Oct 1910 | Box 74 \ 1 scan0037 | |
| Typed memo discussing Brake Horse Power (B.HP) measurements and the 1913 car. | 1st Oct 1910 | Box 74 \ 1 scan0038 | |
| Difficulties of fixing car bodies, referencing Daimler's methods and the unreliability of rubber. | 9th Nov 1910 | Box 74 \ 1 scan0039 | |
| Construction of an aluminium and felt roof, comparing the properties of aluminium to wood. | 29th Nov 1910 | Box 74 \ 1 scan0040 | |
| Note about using aluminium and felt as a liner for a wood roof to counteract moisture absorption. | 29th Nov 1910 | Box 74 \ 1 scan0041 | |
| Unsuitability of the current chassis for long bodies and the need for a special bus chassis. | 6th Dec 1910 | Box 74 \ 1 scan0042 | |
| Typed internal memo agreeing to the suggestion of using a draughtsman for body drawings at Derby. | 28th Dec 1910 | Box 74 \ 1 scan0043 | |
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