| Description | Date | Identifier | |
| To stop work on the Peregrine clutch arrangement G.100500 and replace it with a new design, listing its advantages. | 27th Feb 1933 | Box 1 \ 5 B001_X 111-114-page36 | |
| Schemes for a Peregrine clutch with a damped spring drive. | 28th Feb 1933 | Box 1 \ 5 B001_X 111-114-page37 | |
| Update on when the new Peregrine clutch details will be completed. | 29th Mar 1933 | Box 1 \ 5 B001_X 111-114-page38 | |
| Modifications to the Peregrine 2 clutch spring drive. | 25th Apr 1933 | Box 1 \ 5 B001_X 111-114-page39 | |
| Experimental designs for Peregrine connecting rods, referencing blueprint Lec.3211. | 22th Sep 1932 | Box 1 \ 5 B001_X 111-114-page40 | |
| Specification sheet detailing the weights of a Peregrine connecting rod. | 14th Jan 1933 | Box 1 \ 5 B001_X 111-114-page41 | |
| Weight of a Peregrine Connecting Rod. | 3rd Feb 1933 | Box 1 \ 5 B001_X 111-114-page42 | |
| Design modifications for Peregrine connecting rods, replacing an oil pipe with a drilled hole. | 1st May 1933 | Box 1 \ 5 B001_X 111-114-page43 | |
| Double rear brakes. | 22th Apr 1912 | Box 1 \ 6 B001_X2 Double Rear Brakes-page001 | |
| For the Technical Committee quoting Mr. Royce's thoughts on preliminary foot and emergency brake tests. | 22th Apr 1912 | Box 1 \ 6 B001_X2 Double Rear Brakes-page002 | |
| Removal of the foot-brake drum versus fitting a friction damped spring clutch coupling to cure rattles and vibrations. | 2nd May 1912 | Box 1 \ 6 B001_X2 Double Rear Brakes-page003 | |
| Quoting Mr. Royce's agreement with Mr. Johnson on a proposed course of action following a road test. | 17th Sep 1912 | Box 1 \ 6 B001_X2 Double Rear Brakes-page004 | |
| Five vehicle performance tests conducted on the Broccone Pass, noting temperature and water loss. | 17th Sep 1912 | Box 1 \ 6 B001_X2 Double Rear Brakes-page005 | |
| To the Technical Committee regarding the urgent implementation of fitting both brakes on the back axle for future cars. | 11th Oct 1912 | Box 1 \ 6 B001_X2 Double Rear Brakes-page006 | |
| Urgent request to progress work on 'Experiment No. 2B - Double Rear Brakes' for Chassis No. 2000. | 29th Jan 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page007 | |
| Instructing Mr. Haldenby to urgently proceed with Experiment No. 2B concerning double rear brakes for Chassis No. 2000. | 29th Jan 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page008 | |
| From F.H.R. regarding a weight reduction process for Experiment 2/B. | 29th Jan 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page009 | |
| The performance of a large radiator in cold weather and an experiment with new brakes on the rear wheels. | 21th Feb 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page010 | |
| Replying to Mr. Nadin regarding the status of Double Rear Brakes, Torque Tube & Bronze Sphere Tests, and Radiator specifications for Series 2600 & 2700. | 21th Feb 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page011 | |
| Departmental memo regarding ordering materials for series 2600 and 2700, and progressing with component tests. | 21th Feb 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page012 | |
| Telegram about a persistent axle issue and potential solutions involving the brake drum and a damped coupling. | 21th Feb 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page013 | |
| Telegram from Mr. Royce and a reply regarding an 'axle period' issue with the double rear brakes. | 21th Feb 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page014 | |
| Departmental memo regarding the instruction of materials for 'Double Fear Brakes' and the delivery status of required parts. | 3rd Mar 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page015 | |
| Issues with double rear brakes, specifically oil contamination and pedal force, proposing a potential redesign. | 17th Feb 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page016 | |
| Design modifications for the rear brake mechanism, including its application to wire wheels. | 25th Mar 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page017 | |
| Departmental memo regarding the excessive load required on a pedal and a suggestion to reduce it. | 31th Jan 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page018 | |
| Weekly report from the Experimental Department on rear axle and Austrian Trials Car radiator tests. | 12th Mar 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page019 | |
| Instructions regarding modifications to the gearbox rear to accommodate new double brakes. | 28th Mar 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page020 | |
| Instruction sheet regarding rear gearbox modifications and propeller shaft arrangements. | 25th Mar 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page021 | |
| Instructions for a modification to the rear of box double brakes driving scheme. | 28th Mar 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page022 | |
| Experiment Department report on a fault with brake shoes and a proposal for a new scheme. | 21th Apr 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page023 | |
| Experimental department weekly report regarding testing on rear brakes, helical gears and trial cars. | 15th Apr 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page024 | |
| To Mr. Royce regarding deflection calculations for the double brake actuating gear. | 29th Apr 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page025 | |
| Instruction to Mr Royce regarding an issue with springy parts and imperfect bedding on the double rear brakes. | 29th Apr 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page026 | |
| Modifications and improvements to the brakes on Chassis 2301. | 2nd May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page027 | |
| Extract from a telegram regarding double rear brakes and friction damped spring drive. | 2nd May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page028 | |
| From F.H.R. to Mr Wormald regarding the investigation into Double Rear Brakes. | 2nd May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page029 | |
| Telegram concerning the testing of a gearbox and brakes on mountainous roads. | 2nd May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page030 | |
| Telegram received by telephone regarding the finish of steel drums. | 11th Oct 1912 | Box 1 \ 6 B001_X2 Double Rear Brakes-page031 | |
| Wooden versus wire wheels, and associated brake drum modifications for chassis 2301. | 7th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page032 | |
| Request for the cost difference between an existing chassis and a proposed new chassis with double rear brakes. | 7th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page033 | |
| Benefits of solid versus spring couplings and potential weight reduction. | 8th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page034 | |
| The cost difference between a solid coupling and a spring drive coupling. | 14th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page035 | |
| Performance of cars fitted with double rear brakes and potential road holding issues. | 20th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page036 | |
| Experimental Department 'B' weekly report on component testing and trials. | 15th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page037 | |
| Instruction regarding the mandatory fitting of a coupling barrel G2578 on experimental cars equipped with double brakes. | 21th May 1918 | Box 1 \ 6 B001_X2 Double Rear Brakes-page038 | |
| Instruction memo to Mr. Royce requesting a decision on one of three design schemes for the 2700 Series. | 28th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page039 | |
| The findings of 'Experiment 2' concerning double brakes on rear wheels. | 29th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page040 | |
| Internal memorandum seeking clarification on an alteration to the double rear brake design. | 29th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page041 | |
| Instruction sheet for Mr. Royce regarding a redrawn countershaft for a double brake system, seeking further consideration on operational details. | 30th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page042 | |
| Instruction memo to Mr. Royce calculating excessive thrust on a thumb screw spindle and proposing a new design. | 30th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page043 | |
| Instruction memo to Mr Royce regarding a suggested scheme for a countershaft adjustment locking mechanism. | 30th May 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page044 | |
| Instruction to fit coupling barrel G.2578 on cars with double rear brakes in place of the damping unit. | 11th Jun 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page045 | |
| F.H.R's remarks on the performance and testing of double rear brakes. | 10th Jun 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page046 | |
| Instruction memo to Mr Royce regarding an alteration to the rear of the gearbox for a double brake system. | 13th Jun 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page047 | |
| Responding to concerns about soft brake drums and confirming new ones made of tyre steel are on order. | 13th Jun 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page048 | |
| Instruction to Mr. Royce regarding a design consideration for double brakes, specifically the need for a stronger central collar. | 14th Jun 1914 | Box 1 \ 6 B001_X2 Double Rear Brakes-page049 | |
| Internal instruction to Mr Royce regarding a design modification for steadying the shoe on Daimler Brakes. | 19th Jun 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page050 | |
| Instruction to Mr. Royce regarding a proposal to modify double brakes due to broken light plates and wheel rocking issues. | 14th Jun 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page051 | |
| The standardisation of double rear brakes, with handwritten feedback. | 10th Jul 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page052 | |
| Confirming Mr. Royce's approval for the standardisation of double rear brakes. | 12th Aug 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page053 | |
| Standardisation of double rear brakes. | 10th Jul 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page054 | |
| Report from Mr Haldenby on the condition of the brakes for chassis 2300. | 10th Jul 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page055 | |
| Report from Hurst detailing brake performance and adjustments on Chassis 2301. | 10th Jul 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page056 | |
| Progress report sheet from Hurst on the performance of Chassis 2301. | 16th Jul 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page057 | |
| Proposal to split the aluminium double rear brake covers into two halves for easier maintenance and access. | 16th Jul 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page058 | |
| The receipt of wire wheels for double rear brakes and instructions for fitting bearings. | 31th Jul 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page059 | |
| Troubleshooting and design improvements for a double rear brake system, including pins and bearings. | 20th Aug 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page060 | |
| Instruction sheet to Mr. Royce regarding an alteration to pins for a brake shoe fulcrum. | 22th Aug 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page061 | |
| Extract from a memo by Mr. Royce regarding the adjustment of double rear brakes. | 27th Aug 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page062 | |
| Instructions for an experiment on the double rear brake system using specifically worn ball bearings. | 6th Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page063 | |
| Instructions for the manufacture and modification of wire wheel brake drums. | 17th Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page064 | |
| Internal instruction regarding a delay in ordering new design brake drums, awaiting a report. | 23th Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page065 | |
| Brake drum issues for Dunlop wire wheels and tests with thicker, stiffer drums. | 24th Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page066 | |
| Instruction sheet for the urgent modification and manufacture of wire wheel brake drums. | 24th Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page067 | |
| Instruction to Mr. Royce regarding the replacement of a 'too light' brake drum with a stiffer version for cars with double rear brakes. | 24th Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page068 | |
| Warning against making double brake drums too thin and suggesting taking metal out of other parts of the drum instead. | 26th Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page069 | |
| Disagreement over the fitment of a spring on the foot-pedal for cars with double rear brakes. | 2nd Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page070 | |
| Instruction regarding the necessity and fitting of an extra spring on a foot pedal for experimental cars. | 29th Sep 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page071 | |
| Differing opinions on the necessity of a spring on the foot-pedal for double rear brakes. | 2nd Oct 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page072 | |
| The spring on the foot pedal for double rear brakes. | 15th Oct 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page073 | |
| Instruction memo to Mr. Royce regarding the use of springs in the double brake system to prevent rattling. | 15th Oct 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page074 | |
| Report from the Experimental Department regarding brakes on the 2700 series. | 14th Nov 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page075 | |
| Investigation into a complaint of ineffective double rear brakes at slow speeds due to suspected oil contamination. | 25th Nov 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page076 | |
| Issue with oil on brake surfaces and recommending changes to lubrication procedures. | 25th Nov 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page077 | |
| Complaint that the foot brakes on 2700 series cars are unsuitable for traffic. | 25th Nov 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page078 | |
| Experimental pivots, axle tests, and brake squeaking issues. | 1st Dec 1921 | Box 1 \ 6 B001_X2 Double Rear Brakes-page079 | |
| Containing Mr Haldenby's report on the performance and design of double rear brakes. | 8th Dec 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page080 | |
| Modifying the double rear brakes to prevent oil from the actuating shaft entering the drum. | 13th Dec 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page081 | |
| Experimental Department weekly report detailing tests and issues with various components, focusing on brake vibration. | 16th Dec 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page082 | |
| Short memo regarding 'Double Brakes', attaching a reply from Mr. Bailey. | 24th Dec 1913 | Box 1 \ 6 B001_X2 Double Rear Brakes-page083 | |
| Weekly report from the experimental department on tests for springs, frame bumping, and brake noise. | 6th Jan 1914 | Box 1 \ 6 B001_X2 Double Rear Brakes-page084 | |
| Progress report on Chassis 2301, with entries dated from October 1913 to February 1914. | 16th Apr 1914 | Box 1 \ 6 B001_X2 Double Rear Brakes-page085 | |
| Disagreeing with a suggestion to fit a car with double rear brakes, arguing to keep it single for comparison and experiments. | 18th Mar 1914 | Box 1 \ 6 B001_X2 Double Rear Brakes-page086 | |
| Query regarding the necessity of adjusting brake shoe toggles, with handwritten responses. | 8th May 1914 | Box 1 \ 6 B001_X2 Double Rear Brakes-page087 | |
| Update to the instruction book about brake toggle adjustment. | 11th May 1914 | Box 1 \ 6 B001_X2 Double Rear Brakes-page088 | |
| Separate experiment numbers for different brake liner materials to overcome noise issues. | 8th Jun 1914 | Box 1 \ 6 B001_X2 Double Rear Brakes-page089 | |
| Blank document page with the number 15 handwritten at the top. | 24th Oct 1912 | Box 1 \ 7 B001_X15 20 46 50 59-page001 | |
| Letter to Dunlop Rubber Co. Ltd. regarding feedback on their detachable wheels and a proposal for further testing. | 24th Oct 1912 | Box 1 \ 7 B001_X15 20 46 50 59-page002 | |
| From F.H. Royce regarding the investigation and testing of Dunlop detachable wheels. | 25th Oct 1912 | Box 1 \ 7 B001_X15 20 46 50 59-page003 | |
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