| Description | Date | Identifier | |
| Inquiring about the delivery of experimental open touring and cabriolet bodies for chassis EAC Vlll and EAC.1. | 3rd Mar 1926 | Box 73 \ 1 scan0064 | |
| Status of two experimental bodies, a torpedo and a cabriolet, from the coachbuilder Barkers. | 4th Mar 1926 | Box 73 \ 1 scan0065 | |
| Instruction memo to Messrs. Sanderson & Holmes Ltd. to carry out work on car 9-EX per an attached estimate. | 9th Aug 1926 | Box 73 \ 1 scan0066 | |
| Instruction memo to carry out work on car 9-EX as per an attached estimate. | 20th Sep 1926 | Box 73 \ 1 scan0067 | |
| Attempt to test drive a Hispano car and the proposal to buy a second-hand one for testing. | 29th Oct 1923 | Box 73 \ 1 scan0068 | |
| Method of operating 4-wheel brakes suggested by Mr. Lovesey. | 12th Jul 1923 | Box 73 \ 1 scan0069 | |
| Tests conducted on Ferodo lined wrapping brake shoes. | 8th Dec 1923 | Box 73 \ 1 scan0070 | |
| Test report comparing the performance of different brake shoe designs and their braking power. | 12th Jul 1923 | Box 73 \ 1 scan0071 | |
| The performance and wear of a 'Shoe X' brake component. | 12th Jul 1923 | Box 73 \ 1 scan0072 | |
| The E.A.C.111 servo, detailing pressure distribution to the brakes. | 12th Jul 1923 | Box 73 \ 1 scan0073 | |
| Unexpected multiplication in a servo system and the coefficient of friction. | 13th Dec 1923 | Box 73 \ 1 scan0074 | |
| Modifications to the car's braking system and servo to achieve more equal braking. | 11th Jan 1924 | Box 73 \ 1 scan0075 | |
| Scheme for reducing servo power and investigating brake jaggers. | 12th Jul 1923 | Box 73 \ 1 scan0076 | |
| Modifications to prevent brake judder, or 'jaggers', and the affect on steering. | 1st Jan 1924 | Box 73 \ 1 scan0077 | |
| Front brake effectiveness, steering faults, and brake rig testing. | 12th Jul 1923 | Box 73 \ 1 scan0078 | |
| Issues with steering pivot pins, brake dust covers, and future testing plans for springs and servo leverage. | 1st Jan 1924 | Box 73 \ 1 scan0079 | |
| Diagram showing the arrangement and mechanics of Hispano four-wheel brakes. | 1st Jan 1924 | Box 73 \ 1 scan0080 | |
| Schematic diagram showing the standard and modified arrangements for a 40-50hp four-wheel braking system. | 1st Jan 1924 | Box 73 \ 1 scan0081 | |
| Hand-drawn diagrams and calculations for rear brake pressure on the STD 40-50 RR and Goshawk models. | 22th Jan 1924 | Box 73 \ 1 scan0082 | |
| Servo brake testing, including tests on re-lined shoes and different liner materials. | 22th Jan 1924 | Box 73 \ 1 scan0083 | |
| Series of tests on an E.A.C. servo on a brake testing rig. | 22th Jan 1924 | Box 73 \ 1 scan0084 | |
| Series of tests demonstrating the effects of speed and heat on the wearing capacity of brake linings. | 22th Jan 1924 | Box 73 \ 1 scan0085 | |
| Comparing the horsepower absorbed by rear wheel foot brake shoes versus the servo. | 12th Jul 1923 | Box 73 \ 1 scan0086 | |
| Report attributing excessive servo wear to a lack of cooling facilities for the roasted brake linings. | 18th Nov 1924 | Box 73 \ 1 scan0087 | |
| Diagram and performance graphs for an E.A.C. Servo showing mechanical gain variation with temperature, speed, and load. | 18th Nov 1924 | Box 73 \ 1 scan0088 | |
| Test report on the effect of high temperatures on the wear and mechanical gain factor of a servo system. | 21th Jan 1924 | Box 73 \ 1 scan0089 | |
| Sending two sets of servo brake liners from tested cars for examination. | 23th Jan 1924 | Box 73 \ 1 scan0090 | |
| Servo brake data, comparing cast iron liners with Ferodo linings. | 23th Jan 1924 | Box 73 \ 1 scan0091 | |
| Testing E.A.C. servo brake shoes with cast iron lining. | 1st Jan 1924 | Box 73 \ 1 scan0092 | |
| Comparison of performance and wear characteristics for E.A.C. Servo cast iron and Ferodo liners. | 24th Jan 1924 | Box 73 \ 1 scan0093 | |
| Telegram requesting an experimental modification to the brake servo system. | 25th Jan 1923 | Box 73 \ 1 scan0094 | |
| Test rig findings for the E.A.C. Servo, focusing on Ferodo liner performance. | 1st Jan 1924 | Box 73 \ 1 scan0095 | |
| Brake performance comparing modified and standard leverages. | 12th Jul 1923 | Box 73 \ 1 scan0096 | |
| Secret memo discussing modifications to the brake servo leverage system. | 26th Jan 1924 | Box 73 \ 1 scan0097 | |
| Continued discussion regarding a suggestion for a quick adjustment between the servo and back brakes. | 26th Jan 1924 | Box 73 \ 1 scan0098 | |
| Confirmation of a telegram regarding testing copper liners on a servo brake system. | 28th Jan 1924 | Box 73 \ 1 scan0099 | |
| Brake testing of a 40/50 HP car, focusing on a servo with cast iron liners and its noise issues. | 1st Jan 1924 | Box 73 \ 1 scan0100 | |
| Calculations comparing the unit pressure on RR servo shoes with the Hispano servo. | 1st Feb 1924 | Box 73 \ 1 scan0101 | |
| Comparing Rolls-Royce and Hispano cars. | 1st Feb 1924 | Box 73 \ 1 scan0102 | |
| The hill climbing performance of a 40/50 HP Landaulette in North Devon. | 12th Jul 1923 | Box 73 \ 1 scan0103 | |
| Braking tests conducted in North Devon on Porlock and Countisbury hills. | 12th Jul 1923 | Box 73 \ 1 scan0104 | |
| Comparison of chassis specifications and hill climbing performance between a 40/50 HP model and a Hispano Suiza in North Devon. | 12th Jul 1923 | Box 73 \ 1 scan0105 | |
| Comparison test report of the R.A.C. High Speed Servo and the Hispano-Suiza braking systems. | 7th Feb 1924 | Box 73 \ 1 scan0106 | |
| Slow speed servo brake system for a 40/50 car. | 7th Feb 1924 | Box 73 \ 1 scan0107 | |
| Secret brakes, detailing modifications to the low speed servo and comparing pedal pressure to the Hispano. | 11th Feb 1924 | Box 73 \ 1 scan0108 | |
| Implementation of a slow-speed servo for brakes, including servo drive and pull considerations. | 11th Feb 1924 | Box 73 \ 1 scan0109 | |
| Brake system design, comparing a proposed system using a floating lever with that of Hispano-Suiza. | 11th Feb 1924 | Box 73 \ 1 scan0110 | |
| Typed letter discussing car braking performance on a gradient and personal notes regarding a journey. | 15th Feb 1924 | Box 73 \ 1 scan0111 | |
| Secret memo providing feedback and suggestions on a drawing of a servo for an EAC.4 gearbox. | 15th Feb 1924 | Box 73 \ 1 scan0112 | |
| Continued list of design suggestions regarding component weight, material choice, and alignment. | 25th Feb 1924 | Box 73 \ 1 scan0113 | |
| Copy of a telegram from Mr. Royce regarding a modified side servo braking scheme. | 25th Feb 1924 | Box 73 \ 1 scan0114 | |
| New balancing scheme for the four-wheel brake servo system to reduce friction. | 1st Feb 1924 | Box 73 \ 1 scan0115 | |
| Proposal for a new servo brake system designed to overcome objections evident in existing schemes. | 27th Feb 1924 | Box 73 \ 1 scan0116 | |
| Technical description of a servo-assisted cone clutch mechanism. | 1st Feb 1924 | Box 73 \ 1 scan0117 | |
| Detailed explanation of the interaction between the clutch and the servo braking mechanism. | 27th Feb 1924 | Box 73 \ 1 scan0118 | |
| Technical discussion on the design and possibilities of a servo-assisted and foot-operated braking system. | 27th Feb 1924 | Box 73 \ 1 scan0119 | |
| Secret memo discussing the design and advantages of a semi-servo braking system with swivelling friction surfaces. | 29th Feb 1924 | Box 73 \ 1 scan0120 | |
| Secret memo outlining the required properties for a reliable friction material for a servo system. | 4th Mar 1924 | Box 73 \ 1 scan0121 | |
| Technical memorandum discussing the design, fitting, and oil retention for a servo shaft. | 19th Mar 1924 | Box 73 \ 1 scan0122 | |
| Technical memorandum discussing the design of a servo mechanism, comparing swivel plates to a double cone scheme. | 25th Mar 1924 | Box 73 \ 1 scan0123 | |
| Design and mechanics of a vehicle's braking system, including leverage, servo, and pedal movement. | 25th Mar 1924 | Box 73 \ 1 scan0124 | |
| Instructions for Mr. Hives and a report on a scheme requiring excessive foot pressure. | 29th Sep 1926 | Box 73 \ 1 scan0125 | |
| Telegram requesting measurement of input and output torques for a servo scheme. | 29th Sep 1926 | Box 73 \ 1 scan0126 | |
| Confirmation of a telegram requesting the measurement of input and output torques of a servo. | 26th Mar 1924 | Box 73 \ 1 scan0127 | |
| The average mechanical gain of an agreed servo system. | 26th Mar 1924 | Box 73 \ 1 scan0128 | |
| Tests of a W.W.111 type servo. | 26th Mar 1924 | Box 73 \ 1 scan0129 | |
| The performance of a slow-speed servo motor. | 25th Mar 1924 | Box 73 \ 1 scan0130 | |
| Servo plate deflection, wear, and efficiency under load, including a table of mechanical advantage. | 25th Mar 1924 | Box 73 \ 1 scan0131 | |
| Continuation of servo test results, detailing performance at various speeds and loads. | 25th Mar 1924 | Box 73 \ 1 scan0132 | |
| Secret memorandum discussing design changes for a servo, specifically regarding the external ratchet, swivel plates, and adjustment mechanism. | 29th Mar 1924 | Box 73 \ 1 scan0133 | |
| Particulars of brake friction losses and potential improvements to gain mechanical advantage. | 29th Mar 1924 | Box 73 \ 1 scan0134 | |
| Friction losses in a slow speed plate servo. | 29th Mar 1924 | Box 73 \ 1 scan0135 | |
| The performance of a WW. Agreed Type Servo with varying angle threads. | 4th Apr 1924 | Box 73 \ 1 scan0136 | |
| Slow-speed servo motor with a 55° thread, including performance data and a diagram. | 3rd Apr 1924 | Box 73 \ 1 scan0137 | |
| Graph showing the friction effect in a W.W. slow speed servo. | 7th Apr 1924 | Box 73 \ 1 scan0138 | |
| Technical memo discussing potential causes of lag and sticking in a servo mechanism, with suggestions for improvement. | 7th Apr 1924 | Box 73 \ 1 scan0139 | |
| Comparing the leverages of the WW agreed servo scheme with the original slow speed servo. | 9th Apr 1924 | Box 73 \ 1 scan0140 | |
| Critiquing a servo design, proposing modifications for simplification and improved performance. | 1st Apr 1924 | Box 73 \ 1 scan0141 | |
| Design memorandum discussing floating levers, connecting rod clearance, lubrication and servo action. | 4th Apr 1924 | Box 73 \ 1 scan0142 | |
| Losses in a flat disc type servo. | 4th Apr 1924 | Box 73 \ 1 scan0143 | |
| Friction and other losses in a slow-speed servo, divided into three test sections. | 14th Apr 1924 | Box 73 \ 1 scan0144 | |
| Continuation of a document discussing torque loss and comparing plate pressure on the DES.38 and WW. servo designs. | 14th Apr 1924 | Box 73 \ 1 scan0145 | |
| Test results for a slow-speed servo motor's frictional losses and coefficient of friction. | 14th Apr 1924 | Box 73 \ 1 scan0146 | |
| Secret memo discussing design improvements and issues related to a servo mechanism, including its action, levers, rods, and pressure unit. | 14th Apr 1924 | Box 73 \ 1 scan0147 | |
| Secret memo regarding tests on the WW. slow speed servo. | 17th Apr 1924 | Box 73 \ 1 scan0148 | |
| Tests conducted on an improved type of slow-speed servo. | 17th Apr 1924 | Box 73 \ 1 scan0149 | |
| Test results and diagrams comparing standard and improved slow-speed servo types. | 17th Apr 1924 | Box 73 \ 1 scan0150 | |
| Relaying a telegram about braking lag, servo production, and new test parts. | 23th Apr 1924 | Box 73 \ 1 scan0151 | |
| Servo single ratchet scheme for vehicle braking systems. | 25th Apr 1924 | Box 73 \ 1 scan0152 | |
| Spring placement in a servo design to prevent jamming. | 29th Apr 1924 | Box 73 \ 1 scan0153 | |
| Servo design discussions and proposed improvements following a conference at Derby. | 1st May 1924 | Box 73 \ 1 scan0154 | |
| Two alternative direct braking schemes for testing. | 1st Aug 1924 | Box 73 \ 1 scan0155 | |
| Necessity of grinding servo spur gears in the gearbox to reduce noise and vibration. | 1st May 1924 | Box 73 \ 1 scan0156 | |
| Secret memorandum detailing modifications to the servo system, including drawings for altered servo plates and connecting rods. | 3rd May 1924 | Box 73 \ 1 scan0157 | |
| Secret memo discussing a potential change in the brake servo design, from the RRM scheme to a direct foot pressure system for all four brakes. | 1st May 1924 | Box 73 \ 1 scan0158 | |
| Secret memo discussing experiments to avoid brake 'jaggers', suggesting tests with stiff brake drums as used on Hispano and Isotta cars. | 1st May 1924 | Box 73 \ 1 scan0159 | |
| Issues and potential modifications for a servo braking system scheme. | 3rd May 1924 | Box 73 \ 1 scan0160 | |
| Avoidance of 'jaggers' by experimenting with stiff versus flexible brake drums. | 3rd May 1924 | Box 73 \ 1 scan0161 | |
| Required speed of a brake servo and comparing different design schemes. | 3rd May 1924 | Box 73 \ 1 scan0162 | |
| Design of a brake pedal for use with a servo. | 7th May 1924 | Box 73 \ 1 scan0163 | |
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