| Description | Date | Identifier | |
| Letter from S. Smith & Sons regarding the development of a smaller heater model and comparing design features. | 22th Apr 1938 | Box 137 \ 2 scan0061 | |
| Sending a car heater to the Repair stores for forwarding to Messrs. Park Wards Ltd. | 25th Apr 1938 | Box 137 \ 2 scan0062 | |
| Letter from S. Smith & Sons enclosing a drawing for a reduced-size HaDees Heater. | 25th Apr 1938 | Box 137 \ 2 scan0063 | |
| Inquiry to J. Lucas Ltd. regarding the supply of car heater motors and switches. | 28th Apr 1938 | Box 137 \ 2 scan0064 | |
| Follow-up letter to Messrs. J. Lucas Ltd. regarding a previous correspondence. | 28th Apr 1938 | Box 137 \ 2 scan0065 | |
| Discontinuing the fitting of drain taps and reducing copper piping for Clayton Heaters. | 29th Apr 1938 | Box 137 \ 2 scan0066 | |
| The dispatch of 'CC' and 'RA' type Clayton Heaters for testing due to noise issues. | 30th Apr 1938 | Box 137 \ 2 scan0067 | |
| Letter regarding a sample Clayton Heater rheostat and control knob being sent for evaluation. | 3rd May 1938 | Box 137 \ 2 scan0068 | |
| Letter from Joseph Lucas Ltd. concerning a previous correspondence about a Car Heater Motor. | 3rd May 1938 | Box 137 \ 2 scan0069 | |
| Letter to Clayton Deandre Ltd. regarding quotations, noise issues, and performance data for various car heaters. | 3rd Apr 1938 | Box 137 \ 2 scan0070 | |
| Forwarding of two tested car heaters to Lillie Hall for Mr. J. Lee Evans. | 5th May 1938 | Box 137 \ 2 scan0071 | |
| Instruction to hold up all further casting on the E.88788 Induction Pipe Heater. | 6th May 1938 | Box 137 \ 2 scan0072 | |
| Letter from Clayton Dewandre Company Limited regarding trials, performance, and pricing of heaters. | 7th May 1938 | Box 137 \ 2 scan0073 | |
| Comparison of noise and performance between different car heater models. | 7th May 1938 | Box 137 \ 2 scan0074 | |
| Communication regarding the investigation and return of a sample rheostat. | 7th May 1938 | Box 137 \ 2 scan0075 | |
| Noise levels and comparative testing of two different Clayton Heater models. | 10th May 1938 | Box 137 \ 2 scan0076 | |
| Request for the design of a car heater rheostatic switch. | 11th May 1938 | Box 137 \ 2 scan0077 | |
| Test figures taken on three different types of car heater motors. | 11th May 1938 | Box 137 \ 2 scan0078 | |
| Price difference and motor noise of two Clayton heater models. | 12th May 1938 | Box 137 \ 2 scan0079 | |
| Letter from S. Smith & Sons regarding the future production and modifications of a 'HaDees' car heater. | 18th May 1938 | Box 137 \ 2 scan0080 | |
| Letter to S. Smith & Sons Ltd. requesting to retain a car heater indefinitely for testing purposes. | 1st Jun 1938 | Box 137 \ 2 scan0081 | |
| Letter to The British Thermostat Co. Ltd. requesting a second plain bearing car heater motor for testing. | 1st Jun 1938 | Box 137 \ 2 scan0082 | |
| Letter to The British Thermostat Co. Ltd. requesting a plain bearing motor with flange type fixing. | 2nd Jun 1938 | Box 137 \ 2 scan0083 | |
| Letter from The British Thermostat Co. Ltd. regarding the delayed dispatch of a plain bearing car heater motor. | 2nd Jun 1938 | Box 137 \ 2 scan0084 | |
| Letter from S. Smith & Sons regarding a car heater provided on loan for testing and modification. | 2nd Jun 1938 | Box 137 \ 2 scan0085 | |
| Manufacture of a car heater switch, with blueprints provided for quotations from suppliers. | 3rd Jun 1938 | Box 137 \ 2 scan0086 | |
| Letter from John Marston Ltd. enclosing a rough sketch of a fan unit for car heaters. | 3rd Jun 1938 | Box 137 \ 2 scan0087 | |
| Letter to The British Thermostat Co. Ltd. requesting quotations for a car heater rheostatic switch. | 4th Jun 1938 | Box 137 \ 2 scan0088 | |
| Letter to S. Smith & Sons Ltd. requesting a quotation for a car heater switch and rheostat. | 4th Jun 1938 | Box 137 \ 2 scan0089 | |
| Letter from a supplier regarding a car heater motor and a quotation for an instrument. | 7th Jun 1938 | Box 137 \ 2 scan0090 | |
| Letter confirming the manufacture of a flange for a plain bearing motor. | 7th Jun 1938 | Box 137 \ 2 scan0091 | |
| Letter from S. Smith & Sons acknowledging receipt of blueprint No.DCD.709 for a car heater switch. | 7th Jun 1938 | Box 137 \ 2 scan0092 | |
| Official order for a car heater motor. | 8th Jun 1938 | Box 137 \ 2 scan0093 | |
| Letter to S. Smith & Sons Ltd. arranging a meeting to discuss heaters and requesting a quotation for a heater switch. | 9th Jun 1938 | Box 137 \ 2 scan0094 | |
| Scheme for a resistance and switch for a car heater. | 13th Jun 1938 | Box 137 \ 2 scan0095 | |
| Quotation from The British Thermostat Co., Ltd. for car heater rheostatic switches. | 13th Jun 1938 | Box 137 \ 2 scan0096 | |
| Letter from S. Smith & Sons confirming a meeting to discuss heaters. | 13th Jun 1938 | Box 137 \ 2 scan0097 | |
| Design proposal for a resistance and switch unit for a car heater, outlining its functionality, materials, and appearance. | 13th Jun 1938 | Box 137 \ 2 scan0098 | |
| Blueprint for a Car Heater Resistance and Switch. | 15th Jun 1938 | Box 137 \ 2 scan0099 | |
| Proposed rheostatic switch for heaters on Wraith bodies, including cost and finish options. | 16th Jun 1938 | Box 137 \ 2 scan0100 | |
| Requesting the fitting of a Clayton car heater to vehicle 1.B.50 without water connections. | 17th Jun 1938 | Box 137 \ 2 scan0101 | |
| Details for modifying car heater water connections to a single tap design to reduce costs. | 17th Jun 1938 | Box 137 \ 2 scan0102 | |
| Letter to The British Thermostat Co. Ltd. regarding a missing fan and an awaited thermostat. | 17th Jun 1938 | Box 137 \ 2 scan0103 | |
| Letter from Clayton Dewandre Co. Ltd. confirming receipt of a unit sent for testing and providing an estimated completion timeline. | 18th Jun 1938 | Box 137 \ 2 scan0104 | |
| Letter from S. Smith & Sons discussing modified heater arrangements and enclosing blueprints. | 20th Jun 1938 | Box 137 \ 2 scan0105 | |
| Letter from S. Smith & Sons regarding an air circulation scheme for demisting and heating. | 20th Jun 1938 | Box 137 \ 2 scan0106 | |
| Letter from S. Smith & Sons confirming a discussion and preparing a quotation for a car heater rheostat. | 20th Jun 1938 | Box 137 \ 2 scan0107 | |
| To hold a matter in abeyance pending an individual's return from holiday. | 21th Jun 1938 | Box 137 \ 2 scan0108 | |
| Letter to S. Smith & Sons Ltd. regarding the procurement and specifications of car heater components for experimental cars. | 23th Jun 1938 | Box 137 \ 2 scan0109 | |
| Letter apologising for a missing four-inch fan and a delay in despatching a 'drop in' type thermostat. | 22th Jun 1938 | Box 137 \ 2 scan0110 | |
| Letter from S. Smith & Sons regarding a sample for a car heater and offering an alternative from stock. | 25th Jun 1938 | Box 137 \ 2 scan0111 | |
| Letter from S. Smith & Sons providing a price for a HaDees Blower Housing sample and clarifying an alternative suggestion. | 25th Jun 1938 | Box 137 \ 2 scan0112 | |
| Letter from Clayton Dewandre Company Ltd. regarding the return of a tested element and the forthcoming final test figures. | 27th Jun 1938 | Box 137 \ 2 scan0113 | |
| Replying to queries about the supply and finish for new heater switches. | 28th Jun 1938 | Box 137 \ 2 scan0114 | |
| Official order for a HaDees blower from S. Smith & Co. Ltd. | 28th Jun 1938 | Box 137 \ 2 scan0115 | |
| Letter to a supplier requesting an experimental blower unit and information on flexible hose ducting. | 28th Jun 1938 | Box 137 \ 2 scan0116 | |
| Options for a combined ventilating and car heating system on a Wraith car. | 28th Jun 1938 | Box 137 \ 2 scan0117 | |
| Issues with scuttle ventilators drawing in warm air from the bonnet. | 29th Jun 1938 | Box 137 \ 2 scan0118 | |
| Letter from S. Smith & Sons discussing a modified HaDees Heater design and enclosing blueprint No. EX.Y.10555. | 30th Jun 1938 | Box 137 \ 2 scan0119 | |
| Letter from S. Smith & Sons regarding a HaDees Blower, flexible hose supply difficulties, and potential modifications. | 30th Jun 1938 | Box 137 \ 2 scan0120 | |
| Letter from S. Smith & Sons seeking confirmation on the progress of scheme 'B'. | 30th Jun 1938 | Box 137 \ 2 scan0121 | |
| Letter from S. Smith & Sons regarding an alternative design for a car heater and corrections to a previously sent drawing. | 2nd Jul 1938 | Box 137 \ 2 scan0122 | |
| Letter to S.Smith & Sons Ltd. regarding flexible hose dimensions and a request for a modified Blower C.H.A.2. | 5th Jul 1938 | Box 137 \ 2 scan0123 | |
| Letter from S. Smith & Sons regarding a Blower unit and flexible ducting. | 6th Jul 1938 | Box 137 \ 2 scan0124 | |
| Dispatch of a noisy Clayton type S.2.C.A. heater for testing. | 14th Jul 1938 | Box 137 \ 2 scan0125 | |
| The installation of a combined ventilating and heating scheme in the Garage. | 20th Jul 1938 | Box 137 \ 2 scan0126 | |
| Letter from S. Smith & Sons regarding a sample booster blower, enclosing blueprint EX.X.10581 and discussing alternative designs. | 21th Jul 1938 | Box 137 \ 2 scan0127 | |
| Inquiry regarding the test results of a noisy S2.CA heater and the availability of a cheaper, silent version. | 5th Aug 1938 | Box 137 \ 2 scan0128 | |
| Letter to Clayton Dewandre Co. Ltd. querying a price increase for an S.2.R.A. heater compared to the S.2.C.A. type. | 9th Aug 1938 | Box 137 \ 2 scan0129 | |
| Report comparing the noise levels of two heater models, S.2.C.A. and S.2.R.A., including tests with rubber mountings. | 11th Aug 1938 | Box 137 \ 2 scan0130 | |
| Letter from Clayton Dewandre Company regarding the price difference between S2RA and S2CA heaters. | 12th Aug 1938 | Box 137 \ 2 scan0131 | |
| Inquiry regarding wiper tests and developments of the Smith produced Hadees heater, including its potential use on a show car. | 13th Aug 1938 | Box 137 \ 2 scan0132 | |
| Sending two different types of car heaters to Mr. Honeyman at Conduit Street. | 15th Aug 1938 | Box 137 \ 2 scan0133 | |
| The suitability of Clayton and Smith Hadees heaters for installation. | 16th Aug 1938 | Box 137 \ 2 scan0134 | |
| Requesting the preparation and fitting of car heater parts for Wraith, Bentley III and B.50 models. | 19th Aug 1938 | Box 137 \ 2 scan0135 | |
| Inquiry to Klaxon Ltd. for particulars and a quote for a small electric motor. | 19th Aug 1938 | Box 137 \ 2 scan0136 | |
| Letter to S. Smith & Sons Ltd. regarding a sample booster blower unit and a ventilating/heating scheme. | 20th Aug 1938 | Box 137 \ 2 scan0137 | |
| Letter from S. Smith & Sons arranging a meeting to demonstrate a sample blower. | 22th Aug 1938 | Box 137 \ 2 scan0138 | |
| Trial of two car heater patterns for noise levels and service suitability. | 23th Aug 1938 | Box 137 \ 2 scan0139 | |
| Letter from S. Smith & Sons regarding the despatch of a sample Heater with de-mister parts. | 25th Aug 1938 | Box 137 \ 2 scan0140 | |
| Correspondence to S.Smith & Sons Ltd. regarding the testing of a 'HaDees' car heater which was found to be too noisy. | 2nd Sep 1938 | Box 137 \ 2 scan0141 | |
| Requesting feedback on the trial of an S.2.C.A. Clayton car heater and its rheostat position. | 2nd Sep 1938 | Box 137 \ 2 scan0142 | |
| Investigation into fitting a new car heater from Messrs. Smith onto B.III, B.50 and Wraith models. | 2nd Sep 1938 | Box 137 \ 2 scan0143 | |
| Rheostatic switches for Clayton car heaters, including cost, testing, and recommendations. | 3rd Sep 1938 | Box 137 \ 2 scan0144 | |
| Test results for a Lucas rheostat with a Clayton S.2.C.A. heater, showing resistance, RPM, temperature, and noise levels. | 3rd Sep 1938 | Box 137 \ 2 scan0145 | |
| Requesting the fabrication of a sheet metal adaptor for a defroster blower unit. | 3rd Sep 1938 | Box 137 \ 2 scan0146 | |
| Request to place an order for a 'HaDees' Defroster Blower unit from Messrs. S. Smith & Sons. | 5th Sep 1938 | Box 137 \ 2 scan0147 | |
| Letter from S. Smith & Sons regarding noise tests on a standard HaDees Heater and a proposed solution. | 5th Sep 1938 | Box 137 \ 2 scan0148 | |
| Letter from S. Smith & Sons regarding a quotation for a small blower, clarifying it is a de-froster. | 5th Sep 1938 | Box 137 \ 2 scan0149 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. providing a quotation for car heater components. | 5th Sep 1938 | Box 137 \ 2 scan0150 | |
| Testing of an S.2.C.A. car heater in a new Trials 25/30 HP car. | 5th Sep 1938 | Box 137 \ 2 scan0151 | |
| Request to fit a defroster blower and adaptor to the Clayton car heater on car 1.B.50. | 19th Sep 1938 | Box 137 \ 2 scan0152 | |
| The modification of a Marston made car heater. | 19th Sep 1938 | Box 137 \ 2 scan0153 | |
| Letter to A.C. Sphinx Sparking Plug Co. requesting particulars and a sample of a new car heater and defroster. | 20th Sep 1938 | Box 137 \ 2 scan0154 | |
| Request for blueprints and parts for a Bentley lll car heater and defroster. | 20th Sep 1938 | Box 137 \ 2 scan0155 | |
| Letter to S. Smith & Sons Ltd. regarding the testing of an American 'HaDees' heater and awaiting costs for other parts. | 22th Sep 1938 | Box 137 \ 2 scan0156 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. regarding the suitability of their car heaters for Rolls-Royce vehicles. | 22th Sep 1938 | Box 137 \ 2 scan0157 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. regarding the procurement and testing of a small, compact car heater. | 23th Sep 1938 | Box 137 \ 2 scan0158 | |
| Letter from S. Smith & Sons regarding the production status of a heater and defroster blower. | 24th Sep 1938 | Box 137 \ 2 scan0159 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. proposing a meeting to discuss car heaters. | 26th Sep 1938 | Box 137 \ 2 scan0160 | |
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