| Description | Date | Identifier | |
| Letter from Joseph Lucas Ltd. discussing the potential manufacture and market for car heaters. | 28th Jan 1932 | Box 137 \ 1 scan0101 | |
| Page two of a letter from Joseph Lucas Limited discussing the development of an apparatus. | 6th Feb 1932 | Box 137 \ 1 scan0102 | |
| Interior car heaters with Mr. Thacker of 'Lucas'. | 6th Feb 1932 | Box 137 \ 1 scan0103 | |
| Letter to Joseph Lucas Ltd regarding the despatch of a North East interior car heater for examination. | 8th Feb 1932 | Box 137 \ 1 scan0104 | |
| Interior car heaters and communication with the supplier Lucas. | 9th Feb 1932 | Box 137 \ 1 scan0105 | |
| Investigation into interior car heaters from Clayton Dewandre Co. of Lincoln for potential use in private motor cars. | 4th Apr 1932 | Box 137 \ 1 scan0106 | |
| Arrangement of Type 'S.2' Car Heater. | 5th Apr 1932 | Box 137 \ 1 scan0107 | |
| Installation and features of a Clayton Dewandre interior heater. | 5th Apr 1932 | Box 137 \ 1 scan0108 | |
| Requesting more information about Clayton Dewandre interior heaters. | 19th May 1932 | Box 137 \ 1 scan0109 | |
| Request to Clayton Dewandre Co. Ltd. for a sample of their 'S2' small car heater for examination. | 23th May 1932 | Box 137 \ 1 scan0110 | |
| Letter from Clayton Dewandre Company Ltd. regarding the development of a heater unit for private cars. | 24th May 1932 | Box 137 \ 1 scan0111 | |
| Letter to Clayton Dewandre Co. Ltd. regarding a sample set of car heater equipment. | 26th May 1932 | Box 137 \ 1 scan0112 | |
| New sample interior heater from Clayton Dewandre and its potential installation. | 27th May 1932 | Box 137 \ 1 scan0113 | |
| Acquiring and fitting a Clayton Dewandre interior heater into standardised car bodies. | 30th May 1932 | Box 137 \ 1 scan0114 | |
| Test report on a Clayton car heater, detailing insulation and performance results. | 2nd Jun 1932 | Box 137 \ 1 scan0115 | |
| Letter from Clayton Dewandre Co. Ltd. following up on the testing of a Clayton Heater. | 13th Jun 1932 | Box 137 \ 1 scan0116 | |
| Letter to Clayton Dewandre Company regarding the testing of a Clayton Heater. | 14th Jun 1932 | Box 137 \ 1 scan0117 | |
| Internal inquiry regarding the availability of the Clayton-Dewandre interior heater. | 16th Aug 1932 | Box 137 \ 1 scan0118 | |
| Testing and installing a Clayton Dewandre interior heater. | 17th Aug 1932 | Box 137 \ 1 scan0119 | |
| Letter from Clayton Dewandre Company Ltd. following up on experiments with supplied sample heating equipment. | 30th Aug 1932 | Box 137 \ 1 scan0120 | |
| Letter responding to an inquiry about preliminary tests on Clayton Heating Equipment. | 1st Sep 1932 | Box 137 \ 1 scan0121 | |
| Evaluation of a sample 'Clayton Heater' interior car heater from Clayton Dewandre Co. Ltd. of Lincoln. | 3rd Sep 1932 | Box 137 \ 1 scan0122 | |
| Continuation of a report on a car heater's performance, quietness, and fitting requirements. | 3rd Sep 1932 | Box 137 \ 1 scan0123 | |
| The laboratory tests conducted on a Clayton car heater. | 2nd Jun 1932 | Box 137 \ 1 scan0124 | |
| Performance graph for a Clayton Dewandre interior car heater, showing temperature rise over time from a cold start. | 2nd Jun 1932 | Box 137 \ 1 scan0125 | |
| Performance graph of a Clayton Dewandre interior car heater, showing engine water and interior cabin temperature rise from a cold start. | 9th Sep 1932 | Box 137 \ 1 scan0126 | |
| Feasibility and implications of installing Clayton type interior heaters. | 9th Sep 1932 | Box 137 \ 1 scan0127 | |
| Testing of a sample interior car heater from Clayton Dewandre Ltd. and the cost of offering it as an optional extra. | 10th Sep 1932 | Box 137 \ 1 scan0128 | |
| The supply and quotation for interior car heaters from the Clayton Dewandre Company. | 20th Sep 1932 | Box 137 \ 1 scan0129 | |
| Requesting an update on the subject of Interior Heaters. | 20th Sep 1932 | Box 137 \ 1 scan0130 | |
| Request for a price quotation for a Clayton Dewandre interior heater unit and rheostat switch. | 21th Sep 1932 | Box 137 \ 1 scan0131 | |
| Quotation and installation of interior heaters from Clayton Dewandre's. | 21th Sep 1932 | Box 137 \ 1 scan0132 | |
| Request for three blueprints of the Clayton Dewandre Heater for discussion with coachbuilders. | 27th Sep 1932 | Box 137 \ 1 scan0133 | |
| Quotation from Clayton Dewandre Company Ltd. for the supply of car heaters and rheostats. | 27th Sep 1932 | Box 137 \ 1 scan0134 | |
| Responding to a request for blueprints for the Clayton Interior Heater. | 29th Sep 1932 | Box 137 \ 1 scan0135 | |
| Quotation for a Clayton interior heater and its installation costs. | 4th Oct 1932 | Box 137 \ 1 scan0136 | |
| Costing and pricing for a Clayton Interior Heater. | 5th Oct 1932 | Box 137 \ 1 scan0137 | |
| Supply of parts and method for fitting Clayton interior heaters. | 27th Oct 1932 | Box 137 \ 1 scan0138 | |
| Supply and modification of parts for an interior heater for car 112-GN. | 28th Oct 1932 | Box 137 \ 1 scan0139 | |
| Drawing of a Water Pump End Cover and a Union for an interior heater. | 28th Oct 1932 | Box 137 \ 1 scan0140 | |
| The development and supply of parts for interior heaters for 40/50 HP and 25 HP cars. | 28th Oct 1932 | Box 137 \ 1 scan0141 | |
| Drawings for a water pump end cover, a union replacing plug, and water connections for an interior heater. | 26th Oct 1932 | Box 137 \ 1 scan0142 | |
| View of the rear end of a Phantom II cylinder block, using an end core plug for a water connection. | 26th Oct 1932 | Box 137 \ 1 scan0143 | |
| Schematic for an interior heater fitted on a 40/50 HP car, chassis 20 E.X. | 28th Oct 1932 | Box 137 \ 1 scan0144 | |
| Supply of parts for Clayton Interior Heaters. | 28th Oct 1932 | Box 137 \ 1 scan0145 | |
| Note of thanks regarding the supply of Clayton Interior Heater parts for a 40/50 chassis. | 31th Oct 1932 | Box 137 \ 1 scan0146 | |
| The despatch of a Clayton Interior Heater for a 40/50HP car. | 4th Nov 1932 | Box 137 \ 1 scan0147 | |
| Parts list and instructions for fitting a Clayton Interior Heater to a Phantom II Chassis. | 5th Nov 1932 | Box 137 \ 1 scan0148 | |
| Parts list and instructions for fitting a Clayton Interior Heater to a 20/25 HP chassis. | 5th Nov 1932 | Box 137 \ 1 scan0149 | |
| Request for drawings and information to fit a Clayton heater to chassis 112GN. | 7th Nov 1932 | Box 137 \ 1 scan0150 | |
| Replying to a query about the fitting of a preliminary set of heater parts. | 10th Nov 1932 | Box 137 \ 1 scan0151 | |
| Forwarded details for chassis 112-GN and the car's transfer to Barkers. | 11th Nov 1932 | Box 137 \ 1 scan0152 | |
| Request for further details regarding the supply and fitting of a Clayton Heater to Chassis No. 112-GN. | 5th Dec 1932 | Box 137 \ 1 scan0153 | |
| Correspondence regarding the final layout of fittings for a Clayton Heater on a Phantom II chassis, 112-GN. | 6th Dec 1932 | Box 137 \ 1 scan0154 | |
| Letter from heating engineer J. Edward Hiles concerning a patented heating system for motor vehicles. | 28th Dec 1932 | Box 137 \ 1 scan0155 | |
| Promotional leaflet for the 'Hiles' Patent Vacuum System of Steam Heating for motor vehicles. | 2nd Jan 1933 | Box 137 \ 1 scan0156 | |
| Order for a heater from Clayton Dewandre Co. Ltd. | 2nd Jan 1933 | Box 137 \ 1 scan0157 | |
| Letter to J. Edward Hiles requesting more information about his interior car heating system before a demonstration. | 3rd Jan 1933 | Box 137 \ 1 scan0158 | |
| Advertisement and instruction leaflet for a portable catalytic stove for motor cars. | 19th Nov 1935 | Box 137 \ 1 scan0159 | |
| The scheme for mounting a Clayton Heater on the back of the dashboard for the Phantom III. | 19th Nov 1935 | Box 137 \ 1 scan0160 | |
| Request to fit a Clayton Car Heater to the dashboard of car 32-EX. | 11th Dec 1935 | Box 137 \ 1 scan0161 | |
| New design of tap for the Phantom III car's interior Clayton heater and comparing it to the previous Phantom II design. | 14th Dec 1935 | Box 137 \ 1 scan0162 | |
| Letter to Clayton Dewandre Ltd. requesting information on car heating, defrosters, and air conditioning equipment. | 19th Oct 1936 | Box 137 \ 1 scan0163 | |
| Letter to Clayton Dewandre Ltd requesting the return of a sheet metal oil cooler box cover for testing. | 19th Oct 1936 | Box 137 \ 1 scan0164 | |
| Letter to Messrs. Delco-Remy & Hyatt Ltd. requesting information on car heaters, air conditioning, and windscreen defrosters. | 20th Oct 1936 | Box 137 \ 1 scan0165 | |
| Inquiry to S. Guiterman & Co. Ltd. for information on car heaters, air conditioning, and windscreen defrosters. | 20th Oct 1936 | Box 137 \ 1 scan0166 | |
| Letter of inquiry to R.M. Papelian & Co. Ltd. regarding potential car accessories like batteries, air conditioning, and defrosters. | 20th Oct 1936 | Box 137 \ 1 scan0167 | |
| Letter from R.M. Papelian Ltd. discussing HaDees Hot Water Car Heaters and American Bosch Car Radios. | 21th Oct 1936 | Box 137 \ 1 scan0168 | |
| Continuation page of a letter from R.M. Papelian Limited offering to cooperate on experiments. | 21th Oct 1936 | Box 137 \ 1 scan0169 | |
| Letter from S. Guiterman & Co. Ltd. regarding car heaters, defrosters, and air conditioning equipment. | 22th Oct 1936 | Box 137 \ 1 scan0170 | |
| Letter from S. Guiterman & Co. Ltd. regarding two popular models of car heaters, the Duplex and the Tri-Flo. | 22th Oct 1936 | Box 137 \ 1 scan0171 | |
| Request to obtain one Berkshire defroster for a 12v system from the Houdaille Hydraulic Suspension Co. Ltd. | 27th Oct 1936 | Box 137 \ 1 scan0172 | |
| Letter from Clayton Dewandre Co. Ltd. concerning the specifications and weight of a car heater. | 28th Oct 1936 | Box 137 \ 1 scan0173 | |
| Eliminating side engine guards on a Phantom III for cooling and fitting a sheet steel bonnet to a Bentley. | 30th Oct 1936 | Box 137 \ 1 scan0174 | |
| Letter to Clayton Dewandre Ltd. regarding testing various makes of car heaters for experimental cars. | 3rd Nov 1936 | Box 137 \ 1 scan0175 | |
| Correspondence to Clayton Dewandre Ltd. arranging a meeting to discuss testing car heaters and air conditioning. | 4th Nov 1936 | Box 137 \ 1 scan0176 | |
| Letter to R.M. Papelian Ltd. regarding the supply of a car heater for testing on a Phantom III. | 4th Nov 1936 | Box 137 \ 1 scan0177 | |
| Letter to S. Guiterman & Co. Ltd. requesting a car heater for testing on a Phantom III car. | 4th Nov 1936 | Box 137 \ 1 scan0178 | |
| Follow-up letter to Messrs. Delco-Remy & Hyatt Ltd. requesting a reply to a previous letter. | 4th Nov 1936 | Box 137 \ 1 scan0179 | |
| Letter from Clayton Dewandre Co. Ltd. discussing tests on various car heaters and arranging a meeting. | 4th Nov 1936 | Box 137 \ 1 scan0180 | |
| Letter from Delco-Remy & Hyatt Ltd. apologising for a delayed response and attaching the reply. | 5th Nov 1936 | Box 137 \ 1 scan0181 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the specifications and availability of the Harrison 'Twinflow' Car Heater. | 30th Oct 1936 | Box 137 \ 1 scan0182 | |
| Product sheet for Twinflow Car Heaters, detailing their features and price. | 5th Nov 1936 | Box 137 \ 1 scan0183 | |
| Letter from R.M. Papelian Limited regarding the supply, specifications, and pricing of car model heaters. | 5th Nov 1936 | Box 137 \ 1 scan0184 | |
| Letter from S. Guiterman & Co. Ltd. regarding the fitment of a heater to a Phantom III car. | 6th Nov 1936 | Box 137 \ 1 scan0185 | |
| Letter from S. Guiterman & Co. Ltd. discussing types and pricing of vehicle heaters. | 6th Nov 1936 | Box 137 \ 1 scan0186 | |
| Requesting an official order for a car heater from a list of potential suppliers and models. | 10th Nov 1936 | Box 137 \ 1 scan0187 | |
| Letter from the Experimental Department ordering a Harrison 'Twinflow' Car Heater for test purposes. | 11th Nov 1936 | Box 137 \ 1 scan0188 | |
| Letter from a supplier confirming an order for a Harrison 'Twinflow' Car Heater. | 13th Nov 1936 | Box 137 \ 1 scan0189 | |
| Letter to Clayton Dewandre Co. Ltd. regarding the installation and testing of car heaters. | 17th Nov 1936 | Box 137 \ 1 scan0190 | |
| Letter from Clayton Dewandre Company requesting a typical interior body drawing to consider ducting for a combined heating and ventilating system. | 18th Nov 1936 | Box 137 \ 1 scan0191 | |
| Letter arranging a visit to discuss Car Heaters and Pol Mercury Fuses. | 21th Nov 1936 | Box 137 \ 1 scan0192 | |
| Letter to Clayton Dwandre Co. Ltd. regarding sending various heaters for testing and fitting. | 23th Nov 1936 | Box 137 \ 1 scan0193 | |
| List of fittings for Hadees and Tropic-Aire car heaters. | 24th Nov 1936 | Box 137 \ 1 scan0194 | |
| Forwarding of a Harrison car heater to Messrs Clayton Dewandre for testing. | 24th Nov 1936 | Box 137 \ 1 scan0195 | |
| Letter from Clayton Dewandre Company Ltd. confirming receipt of car heaters and advising they will be tested. | 25th Nov 1936 | Box 137 \ 1 scan0196 | |
| Despatch of a Tropic-aire heater to Clayton Dewandre for testing. | 4th Dec 1936 | Box 137 \ 1 scan0197 | |
| Letter to Clayton Dewandre Ltd. regarding the testing of a second Tropic-aire car heater. | 4th Dec 1936 | Box 137 \ 1 scan0198 | |
| Letter from Clayton Dewandre Company Limited concerning car heater trials and enclosed charts. | 7th Dec 1936 | Box 137 \ 1 scan0199 | |
| Comparative analysis table of American car heaters. | 7th Dec 1936 | Box 137 \ 1 scan0200 | |
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