| Description | Date | Identifier | |
| Issuing a standardisation sheet for the Marston matrix on the Long Type Phantom II chassis radiator. | 16th Nov 1933 | Box 16 \ 2 Scan082 | |
| Standardisation of the Marston Mark III Radiator Matrix. | 6th Nov 1933 | Box 16 \ 2 Scan083 | |
| Tests conducted to investigate and resolve water loss from a Phantom radiator. | 5th Mar 1934 | Box 16 \ 2 Scan084 | |
| Test report on modifying the radiator water flow on a Phantom model to prevent water loss. | 3rd May 1934 | Box 16 \ 2 Scan085 | |
| Investigation into a customer complaint of water loss from a Phantom II radiator, chassis 88-MS. | 20th Feb 1934 | Box 16 \ 2 Scan086 | |
| Diagram illustrating the fluid capacity levels of a radiator header tank. | 16th Mar 1934 | Box 16 \ 2 Scan087 | |
| Graph showing the effect of a pipe restriction on water flow and temperature rise across a Phantom unit engine. | 16th Mar 1934 | Box 16 \ 2 Scan088 | |
| Cover page with a company date stamp. | 3rd May 1934 | Box 16 \ 2 Scan089 | |
| Blueprint detailing a modification to a delivery bend for a water pump. | 3rd May 1934 | Box 16 \ 2 Scan090 | |
| Blueprint detailing a modification to a water pump delivery bend for a 40/50 P.HP engine. | 3rd May 1934 | Box 16 \ 2 Scan091 | |
| Standardisation of an outlet pipe from the water pump with a reduced bore. | 1st May 1934 | Box 16 \ 2 Scan092 | |
| Proposal for standardizing a water pump pipe with a reduced bore for the 'T' series chassis, including estimated costs. | 16th May 1934 | Box 16 \ 2 Scan093 | |
| Analysis of the effect of altitude on the 'air temperature to boil' radiator figure. | 24th Sep 1936 | Box 16 \ 2 Scan094 | |
| Page from a report detailing formulas for calculating boiling points at various altitudes. | 24th Sep 1936 | Box 16 \ 2 Scan095 | |
| Graph showing the variation of boiling point, air temperature, and relative air density with altitude. | 24th Sep 1934 | Box 16 \ 2 Scan096 | |
| Blank backing sheet stamped by the Print Room in Derby. | 24th Sep 1934 | Box 16 \ 2 Scan097 | |
| Graph showing the sea level air temperatures required for boiling to occur at various altitudes. | 24th Sep 1934 | Box 16 \ 2 Scan098 | |
| Graph showing the variation of air temperature to boil and radiator figure with altitude. | 24th Sep 1934 | Box 16 \ 2 Scan099 | |
| The reverse of a document showing a Print Room date stamp. | 24th Sep 1934 | Box 16 \ 2 Scan100 | |
| The capacities of various car cooling systems. | 26th Sep 1934 | Box 16 \ 2 Scan101 | |
| From Bombay concerning corrosion of aluminium parts on the Phantom II model due to chlorinated water. | 12th Dec 1934 | Box 16 \ 2 Scan102 | |
| Letter concerning the corrosion of aluminium water connections on the Phantom II model, advising on replacements. | 28th Dec 1934 | Box 16 \ 2 Scan103 | |
| Rust caused by radiator overflow on a Phantom II, suggesting a flexible pipe to drain water away from the chassis. | 1st Feb 1935 | Box 16 \ 2 Scan104 | |
| Modification notice for chassis RE 12.EX, regarding increased damping on the servo balance links. | 23th Jun 1926 | Box 16 \ 3 Scan001 | |
| Requesting the results of experiments with a steel spring in the servo operating gear for the Phantom and 20 HP models. | 1st Aug 1926 | Box 16 \ 3 Scan002 | |
| Modifications to the servo stop and brake linkage system, including the balancing lever and suspension links. | 1st Aug 1926 | Box 16 \ 3 Scan003 | |
| Modifications to the Phantom Servo Brake Gear to prevent a pin fouling the suspension link. | 27th Aug 1926 | Box 16 \ 3 Scan004 | |
| Modifications to the servo linkage, specifically the hand brake lever spring and a lubricator boss. | 1st Oct 1926 | Box 16 \ 3 Scan005 | |
| Standardisation report on increasing the friction area of servo balance links for damping. | 22th Sep 1926 | Box 16 \ 3 Scan006 | |
| Proposed modifications to the servo brake mechanism to reduce front braking power. | 1st Dec 1926 | Box 16 \ 3 Scan007 | |
| Resolving 'servo jaggers' with spring dampers and recommending the standardization of this solution. | 22th Dec 1926 | Box 16 \ 3 Scan008 | |
| Standardisation sheet discussing an alteration from rubber to flat steel springs to improve flexibility in the servo shaft. | 18th Jan 1927 | Box 16 \ 3 Scan009 | |
| Unsatisfactory friction arrangement on the EAC.VII servo linkage due to an underperforming spring. | 24th Feb 1927 | Box 16 \ 3 Scan010 | |
| Friction calculations and spring specifications for the EAC.7 servo linkage. | 17th Mar 1927 | Box 16 \ 3 Scan011 | |
| Technical memo discussing a discrepancy in load measurements on an EAC.7 servo linkage, complete with a diagram. | 21th Mar 1927 | Box 16 \ 3 Scan012 | |
| Complaint regarding the friction head in the servo linkage and a proposed new spring. | 7th Apr 1927 | Box 16 \ 3 Scan013 | |
| Manufacturing feasibility and specifications for a servo worm gear assembly. | 23th Nov 1927 | Box 16 \ 3 Scan014 | |
| Design and sourcing of worm gears for an integral gearbox servo. | 24th Nov 1927 | Box 16 \ 3 Scan015 | |
| Torque calculations and specifications for the EAC.10 servo gears. | 13th Dec 1927 | Box 16 \ 3 Scan016 | |
| Calculation sheet for the torque required on 40/50 servo gears, including leverage diagrams. | 14th Dec 1927 | Box 16 \ 3 Scan017 | |
| General arrangement for the EAC.10 servo, noting a smaller diameter than the Phantom and proposing a Ferodo lining. | 31th Jan 1928 | Box 16 \ 3 Scan018 | |
| Use of a Bostock & Bramley worm gear for the servo system to handle heavy loads. | 2nd Feb 1928 | Box 16 \ 3 Scan019 | |
| The production of servo worm gear blanks and a supplier's proposed design change. | 13th Feb 1928 | Box 16 \ 3 Scan020 | |
| Dispatch of drawing N.sch.2539, which details the arrangement of brake differentials and their servo connection. | 13th Feb 1928 | Box 16 \ 3 Scan021 | |
| Request to issue a Standardisation Sheet for modified servo gears with a larger pinion on the 40/50 HP chassis. | 12th Jul 1928 | Box 16 \ 3 Scan022 | |
| Trouble with 40/50 HP Chassis Servo Gears and a recommendation to delay standardization. | 25th Jul 1928 | Box 16 \ 3 Scan023 | |
| Internal request for a drawing of the brake servo drive from the transmission shaft and details on its gear reductions. | 1st Dec 1928 | Box 16 \ 3 Scan024 | |
| Modifications for 'SS' brakes to be fitted to chassis 19-EX. | 13th Dec 1928 | Box 16 \ 3 Scan025 | |
| Instruction to experimentally modify the 'SS' chassis brakes by changing the servo cams and increasing the length of lever G.76811. | 17th Dec 1928 | Box 16 \ 3 Scan026 | |
| Query to confirm the correct angle for the Phantom servo operating cams, discussing a 55 degree versus a 45 degree angle. | 18th Dec 1928 | Box 16 \ 3 Scan027 | |
| Technical memorandum discussing the performance and issues with 'SS' brakes and servo mechanisms. | 12th Dec 1928 | Box 16 \ 3 Scan028 | |
| Comparative analysis of two servo designs ('40/50' and 'S S') using calculations for braking forces and wheel skid characteristics. | 12th Dec 1928 | Box 16 \ 3 Scan029 | |
| Braking performance, servo equality, chassis weight reduction, and lever modifications. | 12th Dec 1928 | Box 16 \ 3 Scan030 | |
| Calculations and analysis of servo efficiency and cam angles. | 21th Dec 1928 | Box 16 \ 3 Scan031 | |
| Servo cam angles, coefficients of friction, and load loss for the Phantom and 20 HP models. | 21th Dec 1928 | Box 16 \ 3 Scan032 | |
| Cam angle for the 'SS' servo and brakes on the Phantom chassis. | 22th Dec 1928 | Box 16 \ 3 Scan033 | |
| Technical memo detailing the results of bench and road tests on the 'SS' servo leverage. | 2nd Jan 1929 | Box 16 \ 3 Scan034 | |
| Continued discussion on direct braking, servo torque multiplication, and brake distribution. | 2nd Jan 1929 | Box 16 \ 3 Scan035 | |
| Performance comparison graph between a Super-Sports servo and a standard Phantom servo. | 11th Jan 1929 | Box 16 \ 3 Scan036 | |
| Heavily faded typewritten document with a purple 'Print Room' stamp in the bottom right corner. | 11th Jan 1929 | Box 16 \ 3 Scan037 | |
| Investigation into the angle of servo cams and lever length for the 'SS' brake gear. | 27th Jan 1929 | Box 16 \ 3 Scan038 | |
| Suggestion (N.sch. 2816) to prevent servo driven plate pins from seizing up. | 1st Feb 1929 | Box 16 \ 3 Scan039 | |
| Oil conveyance for the 'SS' servo mechanism and adjustments to the countershaft lever. | 14th Feb 1929 | Box 16 \ 3 Scan040 | |
| Production of the 'SS' servo and brake mechanism, particularly concerning the servo linings. | 13th Mar 1929 | Box 16 \ 3 Scan041 | |
| Testing fabric for the servo due to slight heating concerns on long hills. | 26th Mar 1929 | Box 16 \ 3 Scan042 | |
| Historical outline and test results for the braking system on S.S. cars. | 19th Apr 1929 | Box 16 \ 3 Scan043 | |
| Investigation into brake sponginess and servo performance on the S.S. model compared to the Phantom. | 19th Apr 1929 | Box 16 \ 3 Scan044 | |
| Tests and modifications to improve brake linkage efficiency and operation. | 19th Apr 1929 | Box 16 \ 3 Scan045 | |
| Reverting to original direct rear braking to balance front and rear linkage efficiency. | 10th Apr 1928 | Box 16 \ 3 Scan046 | |
| Efficiency calculations and data for the 'SS' brake linkage system. | 10th Apr 1928 | Box 16 \ 3 Scan047 | |
| Confirming instructions to fit up the 21-EX car with original W.W. leverage and 45° cams in the servo. | 4th Apr 1929 | Box 16 \ 3 Scan048 | |
| Confirming the desirability of altering car leverage to prevent squeaking front brakes. | 17th May 1929 | Box 16 \ 3 Scan049 | |
| Instructions for alterations to the servomechanism on the 40/50 HP chassis for all SS production cars. | 25th May 1929 | Box 16 \ 3 Scan050 | |
| Confirmation to slightly reduce the outside diameter of the woven cotton servo lining to prevent squeaking. | 28th May 1929 | Box 16 \ 3 Scan051 | |
| Inconsistent servo action and a new woven cotton disc servo lining. | 29th May 1929 | Box 16 \ 3 Scan052 | |
| Technical memorandum discussing brake lining wear, performance, and alternative cam configurations. | 29th May 1929 | Box 16 \ 3 Scan053 | |
| Squeaking brakes, comparing the performance of Johns-Manville and Ferobestos brake linings. | 29th May 1929 | Box 16 \ 3 Scan054 | |
| The results of a 10,000-mile test on lubricated cotton duck linings for the 'SS' servo. | 29th May 1929 | Box 16 \ 3 Scan055 | |
| Responding to an earlier memo, detailing modifications to S.S. cars regarding springs, servo lining, thermostat, and exhaust fittings. | 26th Jul 1929 | Box 16 \ 3 Scan056 | |
| Modifications to steering and damper components on S.S. cars to prevent clicking and improve lubrication. | 13th Aug 1929 | Box 16 \ 3 Scan057 | |
| Clarifying the use of cotton duck fabric linings for the S.S. Chassis Servo Motor Mechanism. | 13th Aug 1929 | Box 16 \ 3 Scan058 | |
| Letter from the American branch to Derby discussing a 'Brake Clank' issue and proposed solutions. | 19th Aug 1929 | Box 16 \ 3 Scan059 | |
| Technical explanation of the operation and silent release mechanism for a servo brake system. | 19th Aug 1929 | Box 16 \ 3 Scan060 | |
| Letter from Maurice Olley of Rolls Royce of America, Inc. discussing issues and solutions for front brake adjustment and layout. | 17th Sep 1929 | Box 16 \ 3 Scan061 | |
| Testing of a method to avoid brake clanks, noting initial results were not entirely successful. | 17th Sep 1929 | Box 16 \ 3 Scan062 | |
| Tests carried out to eliminate servo brake clanks, in response to a letter from Mr. Olley. | 18th Sep 1929 | Box 16 \ 3 Scan063 | |
| The performance and issues of a servo braking system linkage and its on-road testing. | 18th Sep 1929 | Box 16 \ 3 Scan064 | |
| Testing two schemes, a pneumatic damper and friction plates, to overcome clanking in a braking system. | 18th Sep 1929 | Box 16 \ 3 Scan065 | |
| On reducing brake friction loads and adding rubber stops to quieten the brake release. | 19th Aug 1929 | Box 16 \ 3 Scan066 | |
| Blueprint diagram illustrating a servo action mechanism. | 19th Aug 1929 | Box 16 \ 3 Scan067 | |
| Drawing illustrating experiments and a proposal to cure a 'clank' in the servo brake system. | 12th Jul 1919 | Box 16 \ 3 Scan068 | |
| Testing different servo lining materials, including Halo and cotton duck fabric, to improve brake servo efficiency. | 21th Sep 1929 | Box 16 \ 3 Scan069 | |
| Tests and recommendations for improving servo efficiency and brake operation consistency through various modifications. | 24th Jun 1929 | Box 16 \ 3 Scan070 | |
| Graph comparing the consistency of performance between dry and oil-soaked servo fabric. | 24th Jun 1929 | Box 16 \ 3 Scan071 | |
| Blank page with a rectangular date stamp in purple ink. | 25th Jun 1929 | Box 16 \ 3 Scan072 | |
| Graph showing servo efficiency curves for various material and mechanical configurations. | 20th Jun 1929 | Box 16 \ 3 Scan073 | |
| Blank page with a Print Room date stamp. | 20th Jun 1929 | Box 16 \ 3 Scan074 | |
| Customer complaints about clanking noises from the brake mechanism and proposed solutions. | 8th Oct 1929 | Box 16 \ 3 Scan075 | |
| Resolving brake arm and noise issues by fitting a cushioned stop and considering a dash pot solution. | 2nd Oct 1929 | Box 16 \ 3 Scan076 | |
| Tests carried out on a buffer stop for a servo balance lever to reduce clanking noises. | 2nd Oct 1929 | Box 16 \ 3 Scan077 | |
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