| Description | Date | Identifier | |
| Instructions for fitting a special radiator, bonnet, and dash with new proportions to chassis 15-EX. | 30th May 1928 | Box 15 \ 1 Scan044 | |
| Instructing a part change for the Phantom Chassis shutter controls for an experiment with a higher radiator. | 30th May 1928 | Box 15 \ 1 Scan045 | |
| Instructions to change chassis 15-EX to standard build and fit its special radiator, bonnet, and dash to chassis 55-AL. | 5th Jun 1928 | Box 15 \ 1 Scan046 | |
| Request to issue a Standardisation Sheet for modifications to the G.2.B. Series Chassis. | 13th Jul 1928 | Box 15 \ 1 Scan047 | |
| Dashboard and radiator modifications for the G.2.B. Series Chassis, confirming a telegram and discussing suggestions from Barker's. | 12th Jul 1928 | Box 15 \ 1 Scan048 | |
| Timeline for fitting a 12-EX car with a higher radiator and dashboard. | 20th Jul 1928 | Box 15 \ 1 Scan049 | |
| Modifications and quality issues of the radiator mascots and fillers for the Phantom and 20 HP models. | 27th Jul 1928 | Box 15 \ 1 Scan050 | |
| Tests to resolve an objectionable fan noise on the Phantom G2B chassis. | 17th Aug 1928 | Box 15 \ 1 Scan051 | |
| Parts list, chassis body design proposals, and radiator and scuttle features. | 28th Aug 1928 | Box 15 \ 1 Scan052 | |
| Schematics and design choices for the 'SS' radiator, cross member, and suspension. | 29th Aug 1928 | Box 15 \ 1 Scan053 | |
| Fitting 'E' type steering and other modifications to the 12-EX car. | 10th Sep 1928 | Box 15 \ 1 Scan054 | |
| Schematic N.Sch.2696, noting Mr. Royce's preference for the simplest method of carrying the starting handle shaft through the radiator matrix. | 12th Sep 1928 | Box 15 \ 1 Scan055 | |
| Standardisation of chassis parts relating to a higher radiator, bonnet, and dash. | 13th Jul 1928 | Box 15 \ 1 Scan056 | |
| Implementation of a new part on a chassis, including costs and testing schedule. | 12th Nov 1928 | Box 15 \ 1 Scan057 | |
| Modifications to the 'SS' radiator outline and its effect on the bonnet. | 28th Sep 1928 | Box 15 \ 1 Scan058 | |
| Instructions for chromium plating an 'SS' car's radiator and headlamps. | 7th Oct 1928 | Box 15 \ 1 Scan059 | |
| Procurement of a chromium-plated radiator and fitting of other chromium-plated parts. | 7th Oct 1928 | Box 15 \ 1 Scan060 | |
| Providing more clearance for the 'SS' radiator and fan by reconstructing the starting handle bracket. | 18th Oct 1928 | Box 15 \ 1 Scan061 | |
| Process of chromium plating on nickel silver and the specifications for various car parts. | 20th Oct 1928 | Box 15 \ 1 Scan062 | |
| Completion and positive reception of the first 'SS' chassis. | 20th Nov 1928 | Box 15 \ 1 Scan063 | |
| Written note discussing modifications to a radiator support, including increasing stud size and using a rubber washer. | 9th Dec 1928 | Box 15 \ 1 Scan064 | |
| Note detailing a modification for a radiator support, increasing the stud size and substituting a rubber washer for the steel spring. | 9th Dec 1928 | Box 15 \ 1 Scan065 | |
| Written note detailing proposals for improving the 'SS' radiator support, including a temporary scheme and forthcoming final modifications. | 9th Dec 1928 | Box 15 \ 1 Scan066 | |
| Design drawing for a modified radiator support with annotations. | 10th Dec 1928 | Box 15 \ 1 Scan067 | |
| Memo regarding suggestions for improving the S.S. Radiator Support. | 9th Dec 1928 | Box 15 \ 1 Scan068 | |
| Written note discussing modifications to a radiator support, including changing stud and washer specifications. | 9th Dec 1928 | Box 15 \ 1 Scan069 | |
| Final method for supporting the 'SS' radiator. | 12th Nov 1928 | Box 15 \ 1 Scan070 | |
| Analysis of 'Radiator Shiver' vibration on 20 HP and 'SS' models. | 17th Dec 1928 | Box 15 \ 1 Scan071 | |
| 'SS' 10,000 miles test, specifically regarding a radiator water leak and a silencer pipe issue. | 27th Dec 1928 | Box 15 \ 1 Scan072 | |
| 'SS' engine mounting, vibration issues, and alternatives to the standard Phantom chassis. | 4th Jan 1929 | Box 15 \ 1 Scan073 | |
| Tests conducted to reduce engine and body vibrations for an 'SS' engine mounting. | 2nd Jan 1929 | Box 15 \ 1 Scan074 | |
| Tests concerning radiator movement, identifying the cause as a sympathetic vibration between the axle and frame periods. | 1st Feb 1929 | Box 15 \ 1 Scan075 | |
| Various tests to reduce radiator movement and engine vibration by modifying subframes and mountings. | 1st Feb 1929 | Box 15 \ 1 Scan076 | |
| Modifications to the body, subframe, and steering to reduce vibration and improve handling. | 1st Feb 1929 | Box 15 \ 1 Scan077 | |
| Technical table comparing radiator movement under various engine mounting, body, and ballast configurations. | 1st Feb 1929 | Box 15 \ 1 Scan078 | |
| Graph of torque versus frame deflection for Chassis GIII and GIV with different spring and mounting configurations. | 8th Feb 1929 | Box 15 \ 1 Scan079 | |
| On cold weather starting tests for 'SS' cars, resulting in the deletion of exhaust heating from production engines. | 8th Feb 1929 | Box 15 \ 1 Scan080 | |
| Complaint of radiator shutters opening too rapidly and a suggested improvement. | 23th Feb 1929 | Box 15 \ 1 Scan081 | |
| Valve control, throttle heating, and carburetter performance for winter conditions. | 2nd Feb 1929 | Box 15 \ 1 Scan082 | |
| Suggestion of having a shutter control on the steering column. | 5th Mar 1929 | Box 15 \ 1 Scan083 | |
| The fan fouling the radiator shutter controls on the 'SS' model and a proposal to lower it. | 1st Mar 1929 | Box 15 \ 1 Scan084 | |
| Engine mounting tests, detailing road conditions, radiator wobble, and directional instability issues. | 12th Mar 1929 | Box 15 \ 1 Scan085 | |
| The periodic nature of wobble in chassis, detailing tests with different engine and radiator mountings. | 12th Mar 1929 | Box 15 \ 1 Scan086 | |
| Two development schemes for improving vehicle damping and frame flexibility. | 12th Mar 1929 | Box 15 \ 1 Scan087 | |
| Road tests concerning wheel diameter, booming noise, engine roughness, and exhaust manifolds. | 12th Mar 1929 | Box 15 \ 1 Scan088 | |
| Experiments with different manifolds, body testing, and frame schemes to address noise and vibration issues. | 9th Apr 1929 | Box 15 \ 1 Scan089 | |
| Proposing an alteration to a water pipe to improve the drainage of the 'SS' water circulation system. | 9th Apr 1929 | Box 15 \ 1 Scan090 | |
| Modified gland and spring for the 'SS' Water Temperature Regulating Valve. | 1st Apr 1929 | Box 15 \ 1 Scan091 | |
| Investigation into the cause and remedy for excessive engine cooling water loss on the S.S. Chassis. | 17th Apr 1929 | Box 15 \ 1 Scan092 | |
| Two-part construction and correct water level for the 20 HP radiator, recommending a modification for S.S. radiators. | 17th Apr 1929 | Box 15 \ 1 Scan093 | |
| Blueprint illustrating the correct and present positions for S.S radiator overflow pipes. | 16th Apr 1929 | Box 15 \ 1 Scan094 | |
| Heavily faded document page with a purple date stamp from Derby. | 16th Apr 1929 | Box 15 \ 1 Scan095 | |
| Investigation into the cause of engine cooling water loss on the S.S. Chassis, with a proposed remedy. | 17th Apr 1929 | Box 15 \ 1 Scan096 | |
| Recommendation for a two-part overflow pipe for the 20 HP radiator, with notes on the correct water level. | 19th Apr 1929 | Box 15 \ 1 Scan097 | |
| Persistent issue of engine cooling water loss on the S. S. Chassis during testing. | 19th Apr 1929 | Box 15 \ 1 Scan098 | |
| Investigation into the loss of engine cooling water on the 'SS' chassis. | 22th Apr 1929 | Box 15 \ 1 Scan099 | |
| Design of a radiator overflow pipe to prevent water loss. | 23th Apr 1929 | Box 15 \ 1 Scan100 | |
| Necessity of automatic water temperature control for the S.S. model to ensure consistent performance and good acceleration. | 1st May 1929 | Box 15 \ 1 Scan101 | |
| Letter discussing radiator choking due to water pump over-lubrication, and requesting steering tests with varying tyre pressures and types. | 2nd May 1929 | Box 15 \ 1 Scan102 | |
| Brake arrangements, including linings, cams, levers, and modifications to reduce front braking. | 3rd May 1929 | Box 15 \ 1 Scan103 | |
| Advantages of thermostat-operated shutters over hand-operated ones for water temperature control. | 3rd May 1929 | Box 15 \ 1 Scan104 | |
| Confirming agreement to modify the position of water pipes on the J.2 Series SS radiator. | 6th May 1929 | Box 15 \ 1 Scan105 | |
| Need for a manual override on the thermostatic shutter control. | 8th May 1929 | Box 15 \ 1 Scan106 | |
| Customer use of anti-freezing mixtures in engine cooling systems. | 10th May 1929 | Box 15 \ 1 Scan107 | |
| Comparing the radiator cooling performance of the 'SS' car against previous Phantom models. | 27th May 1929 | Box 15 \ 1 Scan108 | |
| High-speed cooling tests, comparing bonnet ventilation and radiator temperatures under different conditions. | 12th Jun 1927 | Box 15 \ 1 Scan109 | |
| Car overheating in hot weather, discussing the benefits of bonnet ventilation on SS and Phantom models. | 27th May 1929 | Box 15 \ 1 Scan110 | |
| Graph comparing engine water temperatures of three car models during a hill climb test at Cat and Fiddle. | 27th May 1929 | Box 15 \ 1 Scan111 | |
| Blank document page with a 'Print Room, Derby' stamp. | 29th May 1929 | Box 15 \ 1 Scan112 | |
| Feasibility of fitting the original tapered radiator for car EAC.8 for sales inspection. | 7th Jun 1929 | Box 15 \ 1 Scan113 | |
| Comparison of water loss between an 'SS' radiator and a standard Phantom chassis radiator. | 12th Jun 1929 | Box 15 \ 1 Scan114 | |
| Clarifying a complaint about water loss from an 'S.S.' radiator and suggesting further comparative tests. | 13th Jun 1929 | Box 15 \ 1 Scan115 | |
| Modification to make the SS radiator filler cap watertight. | 19th Jun 1929 | Box 15 \ 1 Scan116 | |
| Issues with choked radiators and recommendations for new radiator tube specifications. | 24th Jul 1929 | Box 15 \ 1 Scan117 | |
| Issues with Phantom radiators becoming choked in service. | 25th Jul 1929 | Box 15 \ 1 Scan118 | |
| Radiator testing, lubrication issues, and material analysis. | 25th Jul 1929 | Box 15 \ 1 Scan119 | |
| Improvements to vehicle cooling systems, focusing on radiator tubes, materials, and summarizing problems with solutions. | 25th Jul 1929 | Box 15 \ 1 Scan120 | |
| Comparison of S.S. radiator performance with variations in tube dimensions and water circulation rates. | 6th May 1929 | Box 15 \ 1 Scan121 | |
| Laboratory report on the analysis of corrosion products from a badly corroded radiator. | 6th May 1929 | Box 15 \ 1 Scan122 | |
| Graph showing the effect of temperature on water circulation through an S.S. Radiator at various pump speeds. | 25th Jul 1928 | Box 15 \ 1 Scan123 | |
| Technical drawing detailing the dimensions of radiator matrices and tubes for various models. | 13th Jun 1929 | Box 15 \ 1 Scan124 | |
| Blueprint of an apparatus with dimensional annotations. | 25th Jul 1945 | Box 15 \ 1 Scan125 | |
| Sending car 10-EX to have its choked radiator replaced and its front axle inspected for damage. | 25th Jul 1929 | Box 15 \ 1 Scan126 | |
| Complaints and solutions for choked radiators. | 26th Jul 1929 | Box 15 \ 1 Scan127 | |
| Page 2 of a document discussing the hydraulic restriction and cooling efficiency of a gap radiator matrix. | 13th Jun 1929 | Box 15 \ 1 Scan128 | |
| Blueprint detailing the dimensions for various radiator matrix and tube models. | 13th Jun 1929 | Box 15 \ 1 Scan129 | |
| Blueprint detailing radiator matrix and tube dimensions for various models. | 13th Jun 1929 | Box 15 \ 1 Scan130 | |
| Suggesting modification to the holes in the baffles of an S.S. radiator to reduce restriction. | 25th Jul 1929 | Box 15 \ 1 Scan131 | |
| Recommending pass/fail criteria for radiator flow rate tests and suggesting improvements to the testing apparatus. | 27th Jul 1929 | Box 15 \ 1 Scan132 | |
| Comparative test of S.S. radiator tubes and a subsequent recommendation. | 7th Aug 1929 | Box 15 \ 1 Scan133 | |
| Diagnosis and method for clearing clay-like obstructions from overheating radiators. | 12th Aug 1929 | Box 15 \ 1 Scan134 | |
| Preventing corrosion in water cooling systems by using soft water and specific alloys. | 13th Aug 1929 | Box 15 \ 1 Scan135 | |
| Comparative testing of 5 1/2 x 7mm and 6 x 7mm radiator tubes for the F.2.B series. | 13th Aug 1929 | Box 15 \ 1 Scan136 | |
| Sending advance information regarding the cleaning of radiators ahead of a formal Depot Sheet. | 14th Aug 1929 | Box 15 \ 1 Scan137 | |
| Depot sheet detailing the cause and remedy for restricted water circulation in radiators. | 13th Aug 1929 | Box 15 \ 1 Scan138 | |
| Radiator obstruction, corrosion, cleaning methods, and a proposed test rig. | 13th Aug 1929 | Box 15 \ 1 Scan139 | |
| Radiator restriction tests, comparing water flow quantities for different radiator types. | 13th Aug 1929 | Box 15 \ 1 Scan140 | |
| Blueprint of a Radiator Test Rig. | 14th Aug 1929 | Box 15 \ 1 Scan141 | |
| Stamped document from the Print Room in Derby. | 14th Aug 1929 | Box 15 \ 1 Scan142 | |
| Issues with car cooling systems, specifically radiator obstructions and hydraulic restrictions on S.S. versus V series models. | 21th Aug 1929 | Box 15 \ 1 Scan143 | |
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