| Description | Date | Identifier | |
| Complexity of the Ph.III steam valve and filler, proposing design reconsideration for cost reduction. | 24th Feb 1936 | Box 94 \ 3 scan0040 | |
| Arguing for the superiority of the Phantom III steam valve over the 'Camel valve' for production models. | 27th Feb 1936 | Box 94 \ 3 scan0041 | |
| Confirming the setup of a water rig for water loss and surging tests on a Phantom III radiator. | 29th Feb 1936 | Box 94 \ 3 scan0042 | |
| Recommendation for the production specifications of Ph.III radiator steam valve diaphragms. | 14th Mar 1936 | Box 94 \ 3 scan0043 | |
| Trial for a new steam escape pipe design for the Phantom III radiator. | 27th Mar 1936 | Box 94 \ 3 scan0044 | |
| Modifications to the steam escape pipe on the 33-EX radiator. | 1st Apr 1936 | Box 94 \ 3 scan0045 | |
| Requesting the fitting of production water inlet pipes to a radiator for testing water loss. | 1st Apr 1936 | Box 94 \ 3 scan0046 | |
| Modifications to stiff radiator shutters on car models 32-EX and 6-B-IV. | 15th Apr 1936 | Box 94 \ 3 scan0047 | |
| The radiator from car 33-EX and instructions for W. Smith to change the water inlet pipes. | 28th Apr 1936 | Box 94 \ 3 scan0048 | |
| Experiments and recommendations to resolve water loss in the Phantom III radiator system. | 30th May 1936 | Box 94 \ 3 scan0049 | |
| Modifications to the Phantom III fan to improve deficient low-speed cooling by increasing its speed. | 4th Jun 1936 | Box 94 \ 3 scan0050 | |
| Material change for the radiator filler cap on the 25/30 HP and Phantom III chassis. | 9th Jun 1936 | Box 94 \ 3 scan0051 | |
| Issues with the Phantom III radiator steam valve and proposing a new design scheme. | 9th Jun 1936 | Box 94 \ 3 scan0052 | |
| Overheating issues with the Phantom III cooling system and proposed solutions. | 10th Jun 1936 | Box 94 \ 3 scan0053 | |
| Radiator, fan, and bonnet cooling tests conducted on a 33-EX car at Brooklands. | 10th Jun 1936 | Box 94 \ 3 scan0054 | |
| Report summarizing cooling performance issues and proposed solutions for the Ph.III car model. | 10th Jun 1936 | Box 94 \ 3 scan0055 | |
| Remedying low-speed cooling issues by using a more effective fan and comparing Ph.III and Ph.II car performance. | 10th Jun 1936 | Box 94 \ 3 scan0056 | |
| Table summarising the results of radiator tests conducted at Brooklands. | 19th May 1931 | Box 94 \ 3 scan0057 | |
| Critical air temperature figures for a Phantom II car with a standard radiator under various driving conditions. | 19th May 1931 | Box 94 \ 3 scan0058 | |
| Graph of Phantom I and Phantom II power curves, titled as a comparison for Phantom II and Ph.III models. | 11th Jun 1936 | Box 94 \ 3 scan0059 | |
| The standardisation of the Mark VI Radiator Matrix for the Phantom III. | 11th Jun 1936 | Box 94 \ 3 scan0060 | |
| Proposing cooling system modifications for a Phantom III car, based on tests conducted on a Cadillac. | 22th Jun 1936 | Box 94 \ 3 scan0061 | |
| Phantom III modifications and the delivery of two 'Mark VI' type Radiator Matrixes for the Experimental Department. | 24th Jun 1936 | Box 94 \ 3 scan0062 | |
| Requesting the construction of a complete radiator assembly for Phantom III cooling tests. | 25th Jun 1936 | Box 94 \ 3 scan0063 | |
| Proposal to change the type of water connection hose and jointing on Phantom III, Bentley & 25/30 vehicles. | 6th Jul 1936 | Box 94 \ 3 scan0064 | |
| Unsatisfactory Phantom III cylinder heads and water circulation temperature variation. | 7th Jul 1936 | Box 94 \ 3 scan0065 | |
| Two alternative schemes to improve the frontal appearance of the Phantom III radiator. | 8th Jul 1936 | Box 94 \ 3 scan0066 | |
| Appearance of a Phantom III radiator and fitting a new wire mesh grill. | 10th Jul 1936 | Box 94 \ 3 scan0067 | |
| Laboratory report on the analysis of a softening rubber radiator hose from a Phantom III vehicle. | 11th Jul 1936 | Box 94 \ 3 scan0068 | |
| Letter to Messrs. G. Harvey & Co. requesting samples of wire mesh for masking car radiator matrices. | 27th Jul 1936 | Box 94 \ 3 scan0069 | |
| Experimental modification to the Phantom III radiator steam valve. | 4th Aug 1936 | Box 94 \ 3 scan0070 | |
| Radiator corrosion, recommending tank removal for examination and fitting a new matrix. | 5th Aug 1936 | Box 94 \ 3 scan0071 | |
| Requesting a modified yoke for a 35-EX radiator to be painted dull black before being built up. | 6th Jun 1936 | Box 94 \ 3 scan0072 | |
| Fitting and testing of a new Hallay matrix radiator for the Phantom III. | 7th Aug 1936 | Box 94 \ 3 scan0073 | |
| Letter to The Leyland Rubber Co. Ltd. enquiring about the suitability of 'P.R.' hose for high-temperature water connections. | 12th Aug 1936 | Box 94 \ 3 scan0074 | |
| Request to fit higher speed fan pulleys to vehicles 33-EX and 35-EX by swapping parts from other units. | 13th Aug 1936 | Box 94 \ 3 scan0075 | |
| Letter from a supplier acknowledging an order for hose connections and advising of a delay due to an annual works closure. | 14th Aug 1936 | Box 94 \ 3 scan0076 | |
| Issues with radiator triangulation and proposing an improved scheme for the Phantom III. | 20th Aug 1936 | Box 94 \ 3 scan0077 | |
| Standardisation of a radiator matrix in a Marston Mark VI block to improve cooling. | 6th Jul 1936 | Box 94 \ 3 scan0078 | |
| The estimated cost and production availability for extra jigs, tools and equipment. | 24th Jun 1936 | Box 94 \ 3 scan0079 | |
| Query regarding the delay in standardizing a more efficient manufacturing method for Phantom III radiator shutter vanes. | 29th Aug 1936 | Box 94 \ 3 scan0080 | |
| Letter from G.A. Harvey & Co regarding the preparation and sending of samples for a frame. | 31th Jul 1936 | Box 94 \ 3 scan0081 | |
| Letter to a supplier inquiring about producing wire mesh grilles in a lighter aluminium alloy. | 1st Sep 1936 | Box 94 \ 3 scan0082 | |
| Requesting to standardise and fit a 'folded over' type of shutter to the 35-EX car radiator. | 1st Sep 1936 | Box 94 \ 3 scan0083 | |
| Design changes to the Phantom III radiator yoke and bracing. | 1st Sep 1936 | Box 94 \ 3 scan0084 | |
| Letter from G.A. Harvey & Co. acknowledging a request to reduce the weight of an item. | 4th Sep 1936 | Box 94 \ 3 scan0085 | |
| Letter from G.A. Harvey & Co. regarding the construction of wire mesh grilles from aluminium wire. | 7th Sep 1936 | Box 94 \ 3 scan0086 | |
| Letter to G.A. Harvey & Co. Ltd. requesting a quotation for 'crinkled' type mesh grilles in aluminium wire. | 10th Sep 1936 | Box 94 \ 3 scan0087 | |
| Quotation from G. A. Harvey & Co. for 200 aluminium wire guards. | 14th Sep 1936 | Box 94 \ 3 scan0088 | |
| Correspondence with The British Tyre & Rubber Co. Ltd. regarding the testing of a twin fan belt arrangement. | 17th Sep 1936 | Box 94 \ 3 scan0089 | |
| Instructions for chromium plating and fitting a wire mesh radiator grille to a Phantom III. | 17th Sep 1936 | Box 94 \ 3 scan0090 | |
| Request to send an official order to Messrs. John Marston & Co. for a Phantom III radiator matrix. | 18th Sep 1936 | Box 94 \ 3 scan0091 | |
| Radiator, fan, and cowl tests conducted at Brooklands on the Ph.III car. | 4th Sep 1936 | Box 94 \ 3 scan0092 | |
| Summary of conclusions from cooling system tests, comparing radiator cowls and different fan types. | 5th Sep 1936 | Box 94 \ 3 scan0093 | |
| Summary of radiator test results comparing various fan, cowling, and bonnet configurations. | 6th Sep 1936 | Box 94 \ 3 scan0094 | |
| The cooling effect of removing various front-end components from a Phantom III. | 6th Sep 1936 | Box 94 \ 3 scan0095 | |
| Results of a Brooklands test showing critical air temperature under various vehicle configurations at approximately 88 MPH. | 8th Sep 1936 | Box 94 \ 3 scan0096 | |
| Requesting the assembly and fitting of a modified Mark VI radiator matrix from John Marston Ltd. | 21th Sep 1936 | Box 94 \ 3 scan0097 | |
| Requesting a modification to the steam valve base during the rebuild of the 35-EX radiator. | 24th Sep 1936 | Box 94 \ 3 scan0098 | |
| Appearance and efficiency of the wire mesh on a radiator for model 34-EX. | 24th Sep 1936 | Box 94 \ 3 scan0099 | |
| Use of a temporary wire mesh on the radiator of the 34-EX model. | 28th Sep 1936 | Box 94 \ 3 scan0100 | |
| Proposed alteration to the Phantom III radiator by removing the front cross bar. | 29th Sep 1936 | Box 94 \ 3 scan0101 | |
| Saving weight and cost on car radiators by reducing the matrix size on Bentley models. | 28th Sep 1936 | Box 94 \ 3 scan0102 | |
| Proposed modifications to the radiator matrix for weight, area, and cost reduction. | 28th Sep 1936 | Box 94 \ 3 scan0103 | |
| Radiator core design, dimensions and testing for Bentley, 25/30 HP, Wraith and Phantom III models. | 28th Aug 1936 | Box 94 \ 3 scan0104 | |
| Modifying instructions for fitting a lightened radiator matrix to a Phantom III. | 6th Oct 1936 | Box 94 \ 3 scan0105 | |
| Modifications and visibility issues related to the Phantom III front apron and bonnet. | 27th Oct 1936 | Box 94 \ 3 scan0106 | |
| Potential design changes to the radiator and bonnet. | 29th Oct 1936 | Box 94 \ 3 scan0107 | |
| Cooling system alterations, refuting the effectiveness of reducing matrix height and widening the bonnet, and requesting a new radiator design for a Bentley car. | 29th Oct 1936 | Box 94 \ 3 scan0108 | |
| Response to criticisms regarding the design of the Phantom III lightened radiator with pressure cooling. | 6th Nov 1936 | Box 94 \ 3 scan0109 | |
| New design for the Phantom III wing stay fixing on the radiator, noting a cost saving and requesting tests. | 6th Nov 1936 | Box 94 \ 3 scan0110 | |
| Instructions for building the matrix unit for the 35-EX radiator without a steam valve. | 16th Nov 1936 | Box 94 \ 3 scan0111 | |
| The assembly of the Phantom III Radiator Steam Pipe, suggesting a detachable clip for easier installation. | 19th Nov 1936 | Box 94 \ 3 scan0112 | |
| Specification for production Phantom III oil coolers. | 21th Nov 1936 | Box 94 \ 3 scan0113 | |
| Scheme for a combined bypass thermostat and shutter control unit for the Phantom III radiator tank. | 5th Dec 1936 | Box 94 \ 3 scan0114 | |
| From Marstons detailing potential cost reductions on radiators for various car models. | 5th Dec 1936 | Box 94 \ 3 scan0115 | |
| Tests investigating methods to lower the Phantom III under-bonnet temperatures. | 8th Dec 1936 | Box 94 \ 3 scan0116 | |
| Temperature and carburation tests conducted under various driving conditions. | 8th Dec 1936 | Box 94 \ 3 scan0117 | |
| Report presenting conclusions and a summary on tests to reduce petrol pump temperature and the effects on carburation. | 9th Dec 1936 | Box 94 \ 3 scan0118 | |
| The deletion of side-guards, weighing the small gain in petrol pump temperature against cost and weight savings. | 9th Dec 1936 | Box 94 \ 3 scan0119 | |
| Table of results for under-bonnet temperature tests under various car configurations and road conditions. | 9th Dec 1936 | Box 94 \ 3 scan0120 | |
| Table showing the results of under-bonnet temperature tests under different car and road conditions. | 9th Dec 1936 | Box 94 \ 3 scan0121 | |
| Assembly issues with the Ph.III radiator shutters and suggesting improvements. | 11th Dec 1936 | Box 94 \ 3 scan0122 | |
| Requesting a cost estimate for a proposed combined thermostatic bypass and shutter control unit on the PH.III. | 11th Dec 1936 | Box 94 \ 3 scan0123 | |
| Cost estimate for a Thermostatic Bypass and Shutter Control Unit on the Phantom III Chassis. | 11th Dec 1936 | Box 94 \ 3 scan0124 | |
| Scheme for combined by-pass and shutter control on the Phantom III radiator, including estimated weight and cost increases. | 21th Dec 1936 | Box 94 \ 3 scan0125 | |
| The replacement of non-tested oil temperature regulator matrices on certain Phantom III cars. | 21th Dec 1936 | Box 94 \ 3 scan0126 | |
| Oil temperature regulator (cooler) failures on PH.III cars. | 1st Dec 1936 | Box 94 \ 3 scan0127 | |
| Oil cooler pressure tests, failures, and manufacturing issues with a supplier. | 1st Dec 1936 | Box 94 \ 3 scan0128 | |
| Diagram showing the positions of leaks on PH III oil coolers. | 5th Dec 1936 | Box 94 \ 3 scan0129 | |
| Adaptation of a combined bypass thermostat and shutter control unit for the Phantom III radiator. | 5th Dec 1936 | Box 94 \ 3 scan0130 | |
| Test report on the Phantom III water-heated hot-spot box to determine if one inlet pipe can be dispensed with. | 16th Dec 1936 | Box 94 \ 3 scan0131 | |
| Instructions and request for equipment to clean the Phantom III oil temperature regulator matrices. | 30th Dec 1936 | Box 94 \ 3 scan0132 | |
| The incorrect fitting of noise-insulated thermometers on production chassis, particularly the P.III. | 6th Jan 1937 | Box 94 \ 3 scan0133 | |
| Requesting modification of a non-standard Phantom III radiator for comparative testing. | 8th Jan 1937 | Box 94 \ 3 scan0134 | |
| Potential corrosion issues with the Phantom III Radiator Cap Valves. | 12th Jan 1937 | Box 94 \ 3 scan0135 | |
| Design to provide easy adjustment for the Phantom III radiator shutters. | 14th Jan 1937 | Box 94 \ 3 scan0136 | |
| From Rm/Std to HPS requesting overdue steam valve parts required for the Test Bed. | 27th Jan 1937 | Box 94 \ 3 scan0137 | |
| Request to detail an adaptor for fan driving pulleys and a special starting handle support bracket for a Phantom III car. | 28th Jan 1937 | Box 94 \ 3 scan0138 | |
| Instruction to fit a Phantom III calorstat spring to a 3.B.1V radiator calorstat. | 28th Jan 1937 | Box 94 \ 3 scan0139 | |
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