| Description | Date | Identifier | |
| Letter regarding trouble getting reliable readings from Hotpoint Heaters on an 'Eagle' engine due to a water leak causing short-circuiting. | 12th Oct 1917 | Box 137 \ 1 scan0001 | |
| Test report on Hotpoint heaters used on engines, recording temperature changes over a 13-hour period. | 8th Oct 1917 | Box 137 \ 1 scan0002 | |
| Test report on 'Hotpoint' water heaters for preventing an Eagle engine from freezing. | 13th Oct 1917 | Box 137 \ 1 scan0003 | |
| Log of temperature readings from a heater test on a water system, measuring temperatures at various points over time. | 9th May 1917 | Box 137 \ 1 scan0004 | |
| Request to fit a heater to chassis 2-LW for Lord Herbert Scott, whose car is having a special cabriolet body built by Barkers. | 7th Aug 1919 | Box 137 \ 1 scan0005 | |
| Investigation of heaters and foot-warmers for Chassis 2-LW, belonging to Lord Herbert Scott. | 1st Aug 1919 | Box 137 \ 1 scan0006 | |
| The design and implementation of foot warmers for American practice. | 28th Jan 1920 | Box 137 \ 1 scan0007 | |
| The receipt of a special foot warmer for chassis 2-LW belonging to Lord Herbert Scott. | 28th Jan 1920 | Box 137 \ 1 scan0008 | |
| List of parts sent from the United States requiring experimental work. | 30th Jan 1920 | Box 137 \ 1 scan0009 | |
| Concerning the whereabouts and inspection of a foot warmer for chassis 2-LW for Lord Herbert Scott. | 31th Jan 1920 | Box 137 \ 1 scan0010 | |
| Page detailing the construction and installation of a Perfection Motor Car Heater. | 12th Feb 1920 | Box 137 \ 1 scan0011 | |
| Test report on two different types of motor-car heaters powered by the exhaust system. | 12th Feb 1920 | Box 137 \ 1 scan0012 | |
| Comparative analysis of the 'Thermorad' and 'Perfection' exhaust heaters. | 1st Feb 1920 | Box 137 \ 1 scan0013 | |
| Comparison of 'Thermorad' and 'Perfection' heaters, with a conclusion on exhaust versus water heating systems. | 12th Feb 1920 | Box 137 \ 1 scan0014 | |
| Heater tests causing explosions in the silencer, with handwritten notes comparing heater models. | 12th Feb 1920 | Box 137 \ 1 scan0015 | |
| The delay in fitting a heater to Lord Herbert Scott's car due to unsatisfactory fittings. | 1st Mar 1920 | Box 137 \ 1 scan0016 | |
| Requesting a report on a letter from Rolls-Royce of America concerning Perfection Heaters. | 10th Aug 1926 | Box 137 \ 1 scan0017 | |
| The dispatch of a report on 'Perfection' Heaters and complaining about inefficient communication. | 12th Aug 1920 | Box 137 \ 1 scan0018 | |
| Letter regarding the supply and potential modification of 'Perfection Heaters' for customers. | 27th Jul 1920 | Box 137 \ 1 scan0019 | |
| Correspondence from Rolls-Royce of America regarding the suitability and necessary modifications of 'Perfection' Heaters for cars. | 27th Aug 1920 | Box 137 \ 1 scan0020 | |
| The order of a 'Temme' sample exhaust heater for trial purposes. | 24th Sep 1920 | Box 137 \ 1 scan0021 | |
| Responding to a query about the 'Perfection' heater, discussing it as a customer accessory versus a standardized part. | 24th Sep 1920 | Box 137 \ 1 scan0022 | |
| Standardizing and experimenting with an exhaust heater design. | 9th Sep 1920 | Box 137 \ 1 scan0023 | |
| Letter from Rolls-Royce of America concerning the use and potential improvements of 'Perfection heaters' on cars. | 19th Oct 1920 | Box 137 \ 1 scan0024 | |
| Cover memo forwarding a letter from America regarding Perfection Heaters. | 3rd Nov 1920 | Box 137 \ 1 scan0025 | |
| Demand for exhaust heaters, problems with existing butterfly valve designs, and an experimental alternative. | 1st Nov 1920 | Box 137 \ 1 scan0026 | |
| Continued page detailing the advantages of a heating system and recommending a welded fitting for the exhaust pipe. | 4th Nov 1920 | Box 137 \ 1 scan0027 | |
| Letter to the Managing Director detailing a report on the examination of a Temme Exhaust Heater. | 5th Nov 1920 | Box 137 \ 1 scan0028 | |
| Design critique on exhaust pipe connections and control mechanisms. | 8th Nov 1920 | Box 137 \ 1 scan0029 | |
| Experimental 'N' Scheme 645 set for Chasses 21 UE and 38 UE for the Emperor of Japan. | 8th Nov 1920 | Box 137 \ 1 scan0030 | |
| Temme Exhaust Heater for Derby's Order 4158. | 16th Nov 1920 | Box 137 \ 1 scan0031 | |
| The delayed design and subsequent fitting of exhaust heaters for two specific chassis, including one for the Emperor of Japan. | 30th Nov 1920 | Box 137 \ 1 scan0032 | |
| Requesting an order for an 'Argen' Vacuum Heater for installation on an experimental car. | 30th Nov 1920 | Box 137 \ 1 scan0033 | |
| Leaflet describing 'The Magic Car Radiator Heater', an electrical device for easier engine starting in cold weather. | 8th Dec 1920 | Box 137 \ 1 scan0034 | |
| Information sheet detailing the principal points and benefits of a car heater. | 7th Dec 1920 | Box 137 \ 1 scan0035 | |
| Letter to an electrical engineer regarding the feasibility of a radiator water heater and a cigar lighter. | 7th Dec 1920 | Box 137 \ 1 scan0036 | |
| Advertisement for the 'Argen' novel car warmer. | 15th Dec 1920 | Box 137 \ 1 scan0037 | |
| Page from 'The Motor' magazine featuring advertisements for car insurance and motor licence holders. | 15th Dec 1920 | Box 137 \ 1 scan0038 | |
| Two samples of exhaust heaters ('Argen' and 'Temme') for potential trial. | 17th Dec 1920 | Box 137 \ 1 scan0039 | |
| The 'Argen' patent vacuum heater and an attached letter from the Arc and General Equipment Company Limited. | 16th Feb 1921 | Box 137 \ 1 scan0040 | |
| Two samples of exhaust heaters, 'Argan' and 'Temme'. | 17th Dec 1920 | Box 137 \ 1 scan0041 | |
| Letter from Arc and General Equipment Ltd. confirming an engineer's visit to Derby. | 30th Dec 1920 | Box 137 \ 1 scan0042 | |
| Telegram confirmation suggesting an appointment for a Monday afternoon. | 30th Dec 1920 | Box 137 \ 1 scan0043 | |
| Attaching a letter from The Cunard Motor & Carriage Co. and asking for a reply. | 21th Dec 1920 | Box 137 \ 1 scan0044 | |
| Letter from Cunard Motor & Carriage Co. regarding difficulties fitting an 'Argen Car Heater' to coachwork on a chassis. | 16th Dec 1920 | Box 137 \ 1 scan0045 | |
| Request for advice regarding the fitting of 'Argen' brand heaters to new chassis by a coachbuilder. | 22th Dec 1920 | Box 137 \ 1 scan0046 | |
| Brochure for 'The Argen' vacuum car heater system manufactured by The Arc & General Equipment, Ltd. | 22th Dec 1920 | Box 137 \ 1 scan0047 | |
| Promotional document for the ARGEN car heating system, detailing its features and operation. | 29th Dec 1920 | Box 137 \ 1 scan0048 | |
| Motor car heaters and the potential substitution of the rear silencer with the 'Argen' system. | 29th Dec 1920 | Box 137 \ 1 scan0049 | |
| Holding letter to The Cunard Motor & Carriage Co. Ltd. regarding an inquiry about an 'Argen' Car Heater. | 29th Dec 1920 | Box 137 \ 1 scan0050 | |
| Letter to The Arc & General Equipment Ltd. regarding difficulties fitting an 'Argen' car heater. | 29th Dec 1920 | Box 137 \ 1 scan0051 | |
| Letter to The Arc & General Equipment Ltd. acknowledging a telegram and arranging a visit to the Experimental Department. | 30th Dec 1920 | Box 137 \ 1 scan0052 | |
| Confirming an engineer from The Arc and General Equipment Co.Ltd. will visit regarding an 'Argen' Heater. | 31th Dec 1920 | Box 137 \ 1 scan0053 | |
| The dispatch of a rear silencer and swan neck for trial fitting of an 'Argen' Heater. | 6th Jan 1921 | Box 137 \ 1 scan0054 | |
| Letter to The Arc & General Equipment Ltd. regarding a rear silencer and snout sent for trial. | 6th Jan 1921 | Box 137 \ 1 scan0055 | |
| Trial of an 'Argen' patent vacuum heater from the Arc and General Equipment Company. | 16th Feb 1921 | Box 137 \ 1 scan0056 | |
| Letter regarding the adaptation and testing of an Argen patent vacuum heater for a silencer. | 3rd Feb 1921 | Box 137 \ 1 scan0057 | |
| Testing of an 'Argen' Patent Vacuum Heater and requesting a report on its performance. | 3rd Mar 1921 | Box 137 \ 1 scan0058 | |
| Letter concerning the delayed trial of a specially modified car heater and the return of subsequent orders. | 14th Oct 1921 | Box 137 \ 1 scan0059 | |
| The Argen Heating Scheme for car bodies and its application to R.R. Cars. | 28th Apr 1924 | Box 137 \ 1 scan0060 | |
| Letter from Argen Car Heater Ltd. concerning the fitting of their apparatus and an opportunity for inspection. | 24th Apr 1924 | Box 137 \ 1 scan0061 | |
| Letter from The Argen Car Heater Limited regarding silencer testing and an enclosed blueprint. | 24th Apr 1924 | Box 137 \ 1 scan0062 | |
| Test report on an Argen car heater/silencer comparing performance with a standard jig. | 24th Apr 1924 | Box 137 \ 1 scan0063 | |
| Publicity material and a sample of Tropic-Aire Heaters for inspection and testing. | 3rd Oct 1930 | Box 137 \ 1 scan0064 | |
| Investigation into different methods of interior car heating, prompted by a request from Conduit Street. | 8th Jan 1931 | Box 137 \ 1 scan0065 | |
| Preference for hot water radiator heating over exhaust heating for car interiors. | 11th Jan 1931 | Box 137 \ 1 scan0066 | |
| Receipt and potential examination of two sample Tropic-Aire heaters. | 23th Jan 1931 | Box 137 \ 1 scan0067 | |
| Letter from Bush Service Corporation, Ltd. describing the operation of Tropic-Aire Heaters. | 30th Aug 1930 | Box 137 \ 1 scan0068 | |
| Letter from Bush Service Corporation Ltd. detailing prices, specifications, and shipping information for heater fans. | 30th Aug 1930 | Box 137 \ 1 scan0069 | |
| Specification and parts list for front and rear bus heating units from Tropic-Aire, Inc. | 30th Aug 1930 | Box 137 \ 1 scan0070 | |
| Advertisement leaflet for Tropic-Aire hot water bus heaters. | 30th Aug 1930 | Box 137 \ 1 scan0071 | |
| Promotional flyer for the Tropic-Aire in-car heater showing installation options and pricing. | 30th Aug 1930 | Box 137 \ 1 scan0072 | |
| Advertisement for the Tropic-Aire hot water rear compartment car heater. | 23th Sep 1930 | Box 137 \ 1 scan0073 | |
| Promotional sales leaflet for dealers regarding Tropic-Aire hot water car heaters. | 23th Sep 1930 | Box 137 \ 1 scan0074 | |
| Advertising flyer for the 1930 Tropic-Aire car heater models and accessories. | 1st Jan 1930 | Box 137 \ 1 scan0075 | |
| Follow-up regarding a sample for car interior heating received from America. | 30th Jan 1931 | Box 137 \ 1 scan0076 | |
| Interest in viewing two sample Tropic-Aire heaters. | 2nd Feb 1931 | Box 137 \ 1 scan0077 | |
| Receipt and planned testing of a sample American car heater, and delaying a decision on the 'Tropicaire' heater. | 3rd Feb 1931 | Box 137 \ 1 scan0078 | |
| Letter concerning sample Tropic-Aire heaters and their potential return. | 26th Feb 1931 | Box 137 \ 1 scan0079 | |
| Quality of Tropic-Aire heaters compared to a Packard type and recommending the return of samples. | 8th Mar 1931 | Box 137 \ 1 scan0080 | |
| The examination and testing of 'Junior' and 'Senior' Tropic-Aire Heater samples. | 10th Mar 1931 | Box 137 \ 1 scan0081 | |
| Publicity material and a sample of Tropic-Aire Heaters for inspection and testing. | 3rd Oct 1930 | Box 137 \ 1 scan0082 | |
| Tropic-Aire Heaters and American production. | 3rd Oct 1930 | Box 137 \ 1 scan0083 | |
| Returning two Tropic-Aire heaters as a superior Packard model was acquired for examination. | 20th Mar 1931 | Box 137 \ 1 scan0084 | |
| Instruction to dispatch two Tropic-Aire heaters to The Bush Service Corporation, Ltd. | 21th Mar 1931 | Box 137 \ 1 scan0085 | |
| Sending two Tropic-Aire Heaters to stores and instructing their return to the Bush Service Corporation Ltd. | 23th Mar 1931 | Box 137 \ 1 scan0086 | |
| Follow-up memo concerning enquiries and samples of interior car heaters from America. | 2nd Nov 1931 | Box 137 \ 1 scan0087 | |
| Fitting an American-made interior heater to a 20-EX car. | 13th Nov 1931 | Box 137 \ 1 scan0088 | |
| Communication about viewing an American electric car heater, proposing a meeting in Derby. | 20th Nov 1931 | Box 137 \ 1 scan0089 | |
| Arrangement to view a car fitted with an interior heater in London. | 30th Nov 1931 | Box 137 \ 1 scan0090 | |
| Discussion with Lucas about the manufacturing and arrangement of car heaters. | 1st Dec 1931 | Box 137 \ 1 scan0091 | |
| Short memo regarding an interior heater and a proposal to get in touch with Lucas. | 2nd Dec 1931 | Box 137 \ 1 scan0092 | |
| Letter sent to Lucas about producing a low-cost car heater based on an American design fitted to the 20-EX experimental car. | 3rd Dec 1931 | Box 137 \ 1 scan0093 | |
| Letter to Joseph Lucas Ltd. proposing the manufacture of a car heater. | 3rd Dec 1931 | Box 137 \ 1 scan0094 | |
| The second page of a letter from the Sales Department. | 4th Dec 1931 | Box 137 \ 1 scan0095 | |
| Car heaters and providing a Lucas representative with facilities to examine a heater on a 20-EX car. | 4th Dec 1931 | Box 137 \ 1 scan0096 | |
| Follow-up letter regarding a promised inspection by Lucas of an interior heater on the experimental car 20-EX. | 22th Jan 1932 | Box 137 \ 1 scan0097 | |
| The lack of response from Lucas about an interior car heater fitted to chassis 20-EX. | 25th Jan 1932 | Box 137 \ 1 scan0098 | |
| Correspondence with Mr. Thacker and Messrs. Joseph Lucas about a car heater. | 29th Jan 1932 | Box 137 \ 1 scan0099 | |
| Letter to Joseph Lucas Ltd. arranging a visit to inspect an experimental car heater and discussing the use of exhaust heat. | 29th Jan 1932 | Box 137 \ 1 scan0100 | |
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