| Description | Date | Identifier | |
| The cancellation of an order for 500 sets of thermometers for the dashboard jacket water temperature. | 28th Jun 1920 | Box 175 \ 4 img003 | |
| High failure rate of thermometers and connecting tubes on post-war cars and the urgency to resolve the supply issue. | 9th Feb 1921 | Box 175 \ 4 img004 | |
| Failures of Cambridge Thermometers and comparing them to the superior Foxboro' instruments. | 10th Feb 1921 | Box 175 \ 4 img005 | |
| The fitting of a more reliable thermometer as an alternative to thermostat-operated radiator shutters. | 10th Feb 1921 | Box 175 \ 4 img006 | |
| Whether to have thermometers made by the Cambridge company to match the American Foxborough model. | 27th Jun 1921 | Box 175 \ 4 img007 | |
| Inquiry to The Cambridge Instrument Co. regarding the supply of a thermometer for cars. | 22th Aug 1921 | Box 175 \ 4 img008 | |
| Letter from The Cambridge and Paul Instrument Company regarding the supply and pricing of a thermometer. | 30th Aug 1921 | Box 175 \ 4 img009 | |
| Letter from an instrument company regarding modifications to a sample transmitting radiator thermometer. | 2nd Sep 1922 | Box 175 \ 4 img010 | |
| Report showing the calibration results for three thermometers against a standard. | 17th Oct 1924 | Box 175 \ 4 img011 | |
| Cover note forwarding a letter from the Cambridge Instrument Co. Ltd. concerning a Radiator Thermometer to the Experimental Department. | 23th Jan 1925 | Box 175 \ 4 img012 | |
| Letter from Cambridge Instrument Company regarding the dispatch and design of a special radiator thermometer. | 20th Jan 1925 | Box 175 \ 4 img013 | |
| Design of a Cambridge thermometer dial and the potentially misleading use of a red sector to indicate high temperatures. | 16th Mar 1925 | Box 175 \ 4 img014 | |
| Requesting a thermometer be returned to the makers for repair via the Stores. | 1st Jan 1926 | Box 175 \ 4 img015 | |
| Return of two Cambridge thermometers to the makers for repair. | 22th Jan 1926 | Box 175 \ 4 img016 | |
| Instructing the stores to return a thermometer to The Cambridge Instrument Co. for repair. | 2nd Feb 1926 | Box 175 \ 4 img017 | |
| Letter requesting a price quotation for a bimetal thermostatic switch for a radiator. | 24th Apr 1926 | Box 175 \ 4 img018 | |
| Letter from Foster Engineering Co. Ltd. declining to quote for a Bi-metal Thermostatic Switch. | 27th Apr 1926 | Box 175 \ 4 img019 | |
| Merits of a warning lamp versus a whistle for radiator water boiling. | 28th Apr 1926 | Box 175 \ 4 img020 | |
| Letter to the Cambridge Instrument Co. regarding a works visit and an enquiry for a cooling water boiling indicator. | 29th Apr 1926 | Box 175 \ 4 img021 | |
| Internal request to place an order with the Cambridge Scientific Instrument Co. for a special distance thermometer. | 4th May 1926 | Box 175 \ 4 img022 | |
| Sourcing an electrical contact thermometer from the Cambridge Instrument Co. to indicate when water is boiling. | 1st May 1926 | Box 175 \ 4 img023 | |
| Thermostat device fitted by Messrs. Barkers to indicate when radiator water is boiling. | 6th May 1926 | Box 175 \ 4 img024 | |
| Enquiry to The British Lighting & Ignition Co. Ltd. for a small dashboard warning lamp. | 13th May 1926 | Box 175 \ 4 img025 | |
| Inquiry to Messrs. Lucas regarding the supply of a small red warning lamp for a car's dashboard. | 13th May 1926 | Box 175 \ 4 img026 | |
| Letter from The British Lighting & Ignition Co Ltd acknowledging a recent correspondence. | 15th May 1926 | Box 175 \ 4 img027 | |
| Letter from Joseph Lucas Limited acknowledging a request for a small lamp. | 17th May 1926 | Box 175 \ 4 img028 | |
| Letter from The British Lighting & Ignition Co Ltd regretting they cannot supply the requested standard lamp fittings. | 18th May 1926 | Box 175 \ 4 img029 | |
| Letter to the Cambridge Instrument Co. regarding a special thermometer and requirements for thermocouples. | 22th May 1926 | Box 175 \ 4 img030 | |
| Letter from Cambridge Instrument Company regarding a delayed order and the specifications for thermo-couples. | 27th May 1926 | Box 175 \ 4 img031 | |
| Letter from Cambridge Instrument Company discussing the design of small thermocouples for measuring temperatures in confined spaces. | 31th May 1926 | Box 175 \ 4 img032 | |
| Letter from Cambridge Instrument Company regarding a special radiator thermometer with an electric contact at 97°C. | 31th May 1926 | Box 175 \ 4 img033 | |
| Letter to Messrs. Lucas Ltd. requesting more information about a small red lamp for a car dashboard. | 4th Jun 1926 | Box 175 \ 4 img034 | |
| The potential adoption of a boiling indicator due to vehicle overheating issues. | 4th Jun 1926 | Box 175 \ 4 img035 | |
| Use of a thermometer with an electric contact to illuminate a red warning lamp at 90°. | 24th Jun 1926 | Box 175 \ 4 img037 | |
| Letter from Cambridge Instrument Company regarding instrument modifications and a new quotation. | 15th Jun 1926 | Box 175 \ 4 img038 | |
| Letter from the Cambridge Instrument Company quoting the cost for a special radiator thermometer. | 18th Jun 1926 | Box 175 \ 4 img039 | |
| Use of a thermometer with a red warning lamp for an instrument panel. | 24th Jun 1926 | Box 175 \ 4 img041 | |
| Order for three special thermometers from the Cambridge Scientific Instrument Co. | 28th Jun 1926 | Box 175 \ 4 img042 | |
| Follow-up letter to Messrs. Lucas regarding a previous inquiry for required supplies. | 28th Jun 1926 | Box 175 \ 4 img043 | |
| The design of a water boiling indicator, its thermometer, and the sourcing of a lamp fixing. | 1st Jul 1926 | Box 175 \ 4 img044 | |
| Letter from Joseph Lucas Ltd. clarifying requirements for a temperature indicating lamp. | 2nd Jul 1926 | Box 175 \ 4 img045 | |
| Letter to Lucas requesting the supply of a red dynamo warning lamp for fitment to all R-R cars. | 5th Jul 1926 | Box 175 \ 4 img046 | |
| Diagram illustrating the installation of a red dash lamp for a 40/50 model. | 7th Jul 1926 | Box 175 \ 4 img047 | |
| Correspondence from Joseph Lucas Limited regarding a Temperature Indicating lamp for an instrument board. | 7th Jul 1926 | Box 175 \ 4 img048 | |
| Scheme for a red warning light to indicate when the engine's water is nearing boiling point. | 20th Oct 1926 | Box 175 \ 4 img050 | |
| Required specifications for Cambridge thermometers for instrument boards. | 21th Oct 1926 | Box 175 \ 4 img051 | |
| Standardisation of a water boiling indicator thermometer that operates a red warning light. | 21th Oct 1926 | Box 175 \ 4 img052 | |
| Thermostat indicator, attaching a previous memo and preparing for a court appearance. | 3rd Nov 1926 | Box 175 \ 4 img053 | |
| Arranging for officials to give evidence in court regarding a thermostat indicator. | 3rd Nov 1926 | Box 175 \ 4 img054 | |
| Letter concerning a patent infringement case over a thermostat indicator and a request for company officials to provide evidence. | 2nd Oct 1926 | Box 175 \ 4 img055 | |
| Model water boiling indicator lamp for the 40/50 HP, noting a difficulty in obtaining red glass. | 20th Nov 1926 | Box 175 \ 4 img056 | |
| The despatch of a water boiling indicator (red lamp) to Mr. Cowan in London. | 22th Nov 1926 | Box 175 \ 4 img057 | |
| Design changes and questioning the cost for a proposed water boiling indicator lamp. | 26th Nov 1926 | Box 175 \ 4 img058 | |
| Proposed design changes and the high cost of a water boiling indicator lamp. | 26th Nov 1926 | Box 175 \ 4 img059 | |
| Request to send a car to London to test a temperature indicator by driving with the radiator shutters closed. | 7th Dec 1920 | Box 175 \ 4 img060 | |
| Introduction of a thermometer with an electrical connection for a warning lamp. | 14th Dec 1926 | Box 175 \ 4 img061 | |
| Standardisation of a thermometer with an electrical contact to warn of boiling. | 22th Sep 1926 | Box 175 \ 4 img062 | |
| Standardisation of a thermometer with an electrical contact for chassis parts. | 4th Jan 1927 | Box 175 \ 4 img064 | |
| Improvements to the engine cooling system, suggesting an automatic shutter over a simple warning lamp. | 15th Feb 1927 | Box 175 \ 4 img065 | |
| Sending a Cambridge Thermometer back to the manufacturer for repair. | 27th May 1927 | Box 175 \ 4 img066 | |
| Letter to The Cambridge Instrument Co. regarding a faulty thermometer with an electrical warning contact. | 10th Aug 1927 | Box 175 \ 4 img067 | |
| Letter from Cambridge Instrument Company regarding the failure of a dial thermometer's electrical contacts due to excessive current. | 12th Aug 1927 | Box 175 \ 4 img068 | |
| Continuation sheet from Cambridge Instrument Company concerning a returned instrument and the cause of its failure. | 15th Aug 1927 | Box 175 \ 4 img069 | |
| Letter to General Electric Co. Ltd. inquiring about the supply of 12/14 volt lamps with Miniature Edison Screw Caps. | 15th Aug 1927 | Box 175 \ 4 img070 | |
| Instructions for sending a faulty thermometer from car 9-EX to the Cambridge Scientific Instrument Co. for repair. | 1st Aug 1927 | Box 175 \ 4 img071 | |
| Instruction to send a melted thermometer from a 9-EX car to the Cambridge Scientific Instrument Co. for repair. | 17th Aug 1927 | Box 175 \ 4 img072 | |
| Letter from The General Electric Co. Ltd. regarding a request to manufacture 12/14 volt .1 ampere lamps. | 17th Aug 1927 | Box 175 \ 4 img073 | |
| Letter to The General Electric Co. Ltd. regarding an order for lamps for trial purposes. | 19th Aug 1927 | Box 175 \ 4 img074 | |
| Letter from Cambridge Instrument Company regarding the free of charge electrical adjustment of a radiator thermometer for chassis 9-EX. | 14th Sep 1927 | Box 175 \ 4 img075 | |
| Correspondence to The Cambridge Instrument Co. Ltd. regarding the repair of a melted thermometer from Chassis No.9-EX. | 19th Aug 1927 | Box 175 \ 4 img076 | |
| Order of lamp bulbs from G.E.C. for experimental trial. | 18th Aug 1927 | Box 175 \ 4 img077 | |
| Confirming a conversation about providing covers for a chassis thermometer's electrical terminals. | 22th Aug 1927 | Box 175 \ 4 img078 | |
| Confirmation of fitting 16/18 volt, 2.4 watt warning lamp bulbs to cars 8-EX and 12-EX. | 27th Aug 1927 | Box 175 \ 4 img079 | |
| Serious fault in a thermometer with an earthed terminal, proposing testing of all stock and the addition of protective covers. | 31th Aug 1927 | Box 175 \ 4 img080 | |
| Request for authorisation to have the Cambridge Instrument Co. repair radiator thermometer No. 76920. | 5th Sep 1927 | Box 175 \ 4 img081 | |
| Failure of a Cambridge thermometer with an electrical contact, attributing blame to the manufacturer. | 13th Sep 1927 | Box 175 \ 4 img082 | |
| Reliability of automatically controlled radiator shutters versus manual control with a warning lamp. | 24th Sep 1927 | Box 175 \ 4 img083 | |
| Letter to The Cambridge Instrument Co. Ltd. discussing various instrument failures due to earthing and insufficient clearances. | 27th Sep 1927 | Box 175 \ 4 img084 | |
| Letter suggesting an insulated, push-fit cap for a dial screw to prevent potential short circuits from high temperatures. | 3rd Oct 1927 | Box 175 \ 4 img085 | |
| Internal memorandum regarding troubles with a returned thermometer from the Cambridge Company. | 3rd Oct 1927 | Box 175 \ 4 img086 | |
| Potential design issues with the Cambridge Thermometer, including proximity of parts to live connections and dial overrun. | 10th Oct 1927 | Box 175 \ 4 img088 | |
| Repair of a damaged Cambridge Thermometer, found to be fused by a high current. | 7th Oct 1927 | Box 175 \ 4 img089 | |
| Short-circuit in chassis 4-RF caused by the thermometer needle contacting a screw at high temperatures. | 12th Oct 1927 | Box 175 \ 4 img090 | |
| Electrical failure on chassis 4-RF for Daniel Dreyfus, Esq. | 14th Oct 1927 | Box 175 \ 4 img091 | |
| Follow-up letter from Cambridge Instrument Company regarding a Dial Thermometer with Electrical Contacts. | 13th Oct 1927 | Box 175 \ 4 img092 | |
| Known issue with an electric contact water thermometer on chassis 4 RF for Daniel Dreyfus, Esq. | 17th Oct 1927 | Box 175 \ 4 img093 | |
| Letter to the Cambridge Scientific Instrument Co. regarding the repair of an electrical thermometer. | 18th Oct 1927 | Box 175 \ 4 img094 | |
| Drawing of the connections for a Cambridge alcohol vapour thermometer. | 19th Oct 1927 | Box 175 \ 4 img095 | |
| Instructions sheet detailing the performance of special 16V lamps fitted to indicating thermometers on two chassis. | 25th Oct 1927 | Box 175 \ 4 img096 | |
| Letter from Cambridge Instrument Company regarding the approval and dispatch of a dummy radiator thermometer. | 26th Oct 1927 | Box 175 \ 4 img097 | |
| Recommending a new, higher voltage bulb for the radiator thermometer indicating lamp to prevent it from burning out. | 27th Oct 1927 | Box 175 \ 4 img098 | |
| Testing a special 16/18 V, 2.4 watt bulb for an electric thermometer and warning lamp. | 27th Oct 1927 | Box 175 \ 4 img099 | |
| Letter to Cambridge Instrument Co. Ltd. regarding testing a sample instrument and requesting one with an additional stop. | 27th Oct 1927 | Box 175 \ 4 img100 | |
| Requesting an order for the repair of a thermometer sent to The Cambridge Instrument Co. | 28th Oct 1927 | Box 175 \ 4 img101 | |
| Ordering larger capacity bulbs for radiator temperature indicating lamps on 20 and 40/50 HP chassis. | 1st Nov 1927 | Box 175 \ 4 img102 | |
| Requesting tests on a modified Cambridge Thermometer fitted with two stops to assess potential damage from overheating. | 3rd Nov 1927 | Box 175 \ 4 img103 | |
| Testing of a Cambridge thermometer with contacts, fitted with two stops, on an experimental car. | 4th Nov 1927 | Box 175 \ 4 img104 | |
| Testing of a modified Cambridge thermometer with two stops on an experimental car. | 4th Nov 1927 | Box 175 \ 4 img105 | |
| Inquiring about the use of 16/18 volt, 3 watt lamp bulbs for thermometer indicating lamps on production. | 13th Dec 1928 | Box 175 \ 4 img106 | |
| Order for six lamp bulbs from G.E.C. for use in the Experimental Department. | 3rd Jan 1928 | Box 175 \ 4 img107 | |
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