| Description | Date | Identifier | |
| Letter chasing an overdue order for a Distance Thermometer from Messrs. Negretti & Zambra. | 17th Sep 1923 | Box 40 \ 1 Scan051 | |
| Letter from Negretti & Zambra regarding the dispatch of a transmitter. | 18th Sep 1923 | Box 40 \ 1 Scan052 | |
| Certificate of Examination for Dial thermometer No. 1633, detailing scale reading corrections. | 4th Oct 1923 | Box 40 \ 1 Scan053 | |
| Request to check a Negretti & Zambra fahrenheit distance thermometer for inaccuracy. | 9th Oct 1923 | Box 40 \ 1 Scan054 | |
| Letter to Messrs. Negretti & Zambra regarding a faulty Fahrenheit thermometer, including test results showing inaccuracies. | 10th Oct 1923 | Box 40 \ 1 Scan055 | |
| The return of a distance thermometer to the manufacturer for repair. | 10th Oct 1923 | Box 40 \ 1 Scan056 | |
| Test results for a Negretti and Zambra Distance Thermometer. | 23th Oct 1923 | Box 40 \ 1 Scan057 | |
| Letter from Negretti & Zambra regarding a faulty transmitting thermometer returned for inspection. | 23th Oct 1923 | Box 40 \ 1 Scan058 | |
| Letter to Messrs. Negretti & Zambra following up on a Distance Thermometer sent for repair. | 22th Nov 1923 | Box 40 \ 1 Scan059 | |
| Letter from instrument makers Negretti & Zambra concerning the overhaul, testing, and potential trial of a Dial Thermometer. | 26th Nov 1923 | Box 40 \ 1 Scan060 | |
| Letter to Messrs. Negretti & Zambra Ltd. stating their previous correspondence from October and the previous month cannot be traced. | 1st Dec 1923 | Box 40 \ 1 Scan061 | |
| Letter from Negretti & Zambra enquiring about the status of a dial thermometer sent for trial. | 3rd Dec 1923 | Box 40 \ 1 Scan062 | |
| Arrangements and price for a sample distance thermometer supplied by Messrs. Negretti & Zambra. | 5th Dec 1923 | Box 40 \ 1 Scan063 | |
| Brief typed and handwritten note regarding particulars and pricing. | 12th Dec 1923 | Box 40 \ 1 Scan064 | |
| Trial of a Mercury filled Distance Thermometer from Negretti & Zambra. | 12th Dec 1923 | Box 40 \ 1 Scan065 | |
| Purchase of a sample thermometer and confirming its guarantee after repair. | 13th Dec 1923 | Box 40 \ 1 Scan066 | |
| Letter regarding the purchase of a large mercury-filled distance thermometer from Messrs. Negretti & Zambra. | 1st Jan 1924 | Box 40 \ 1 Scan067 | |
| Detailed report from Negretti & Zambra on a mercury-filled water temperature thermometer, noting its cost and accuracy. | 7th Jan 1924 | Box 40 \ 1 Scan068 | |
| Water temperature thermometer made for motor car engines. | 30th Oct 1922 | Box 40 \ 1 Scan069 | |
| Comparison report of an N. & Z. instrument against a Vapour pressure instrument across various performance tests. | 11th Oct 1926 | Box 40 \ 1 Scan070 | |
| Letter from instrument maker Negretti & Zambra regarding vapour pressure type instruments. | 12th Oct 1923 | Box 40 \ 1 Scan071 | |
| Repair and potential purchase of a dial thermometer from Negretti & Zambra. | 8th Jan 1924 | Box 40 \ 1 Scan072 | |
| Letter from Negretti & Zambra regarding the return and cost of a Dial Thermometer. | 7th Jan 1924 | Box 40 \ 1 Scan073 | |
| Requesting a test on a new, more cost-effective ether-filled thermometer from Negretti & Zambra. | 9th May 1924 | Box 40 \ 1 Scan074 | |
| Instructing to fit a thermometer supplied by Negretti and Zambra to a car going to France. | 27th May 1924 | Box 40 \ 1 Scan075 | |
| Return of an Acrometer disc valve to the makers, Negretti & Zambra, for repair. | 1st Sep 1924 | Box 40 \ 1 Scan076 | |
| Letter to Messrs. Negretti & Zambra regarding a faulty Acrometer Valve and special Gauge being returned for examination. | 8th Sep 1924 | Box 40 \ 1 Scan077 | |
| Letter from Negretti & Zambra acknowledging they will examine a non-return valve upon receipt. | 9th Sep 1924 | Box 40 \ 1 Scan078 | |
| Instructing the return of an Acrometer Disc Valve to Messrs. Negretti & Zambra for repair. | 15th Sep 1924 | Box 40 \ 1 Scan079 | |
| Returning an unsatisfactory Acrometer Valve and Special Gauge to Messrs. Negretti and Zambra for rectification. | 16th Sep 1924 | Box 40 \ 1 Scan080 | |
| Letter from Negretti & Zambra following up on the non-receipt of an Acrometer for examination. | 17th Sep 1924 | Box 40 \ 1 Scan081 | |
| Letter from Negretti & Zambra regarding the condition and reading discrepancies of a returned Acrometer valve. | 19th Sep 1924 | Box 40 \ 1 Scan082 | |
| Letter from Negretti & Zambra suggesting a modification to a pressure gauge for more accurate cylinder compression readings. | 19th Sep 1924 | Box 40 \ 1 Scan083 | |
| The despatch of two distance thermometers to Messrs. Negretti & Zambra for overhaul and repair. | 4th Jun 1925 | Box 40 \ 1 Scan084 | |
| Sending two faulty Distance Thermometers, purchased from Messrs. Negretti & Zambra, for overhaul. | 4th Jun 1925 | Box 40 \ 1 Scan085 | |
| Trial of two sets of tyres from the North British Rubber Company. | 24th Feb 1925 | Box 40 \ 1 Scan086 | |
| Letter of enquiry to Messrs. Negretti & Zambra regarding the purchase of two specific thermometers. | 29th Jan 1926 | Box 40 \ 1 Scan087 | |
| Follow-up letter to Messrs. Negretti & Zambra regarding a previous correspondence and the supply of instruments. | 17th Feb 1926 | Box 40 \ 1 Scan088 | |
| Letter from Negretti & Zambra regarding the supply, price, and delivery of Mercury-in-Steel Dial Thermometers. | 18th Feb 1926 | Box 40 \ 1 Scan089 | |
| Letter to Messrs. Negretti & Zambra declining a quotation for thermometers due to the expense. | 20th Feb 1926 | Box 40 \ 1 Scan090 | |
| Instructing Stores to return an oil pressure gauge to the makers, Dewrance & Co., for repair. | 28th Apr 1926 | Box 40 \ 1 Scan091 | |
| Requesting a Negretti & Zambra Thermometer be returned to the makers for repair. | 17th Aug 1926 | Box 40 \ 1 Scan092 | |
| Product list for transmitting oil pressure gauges by Negretti & Zambra. | 17th Aug 1926 | Box 40 \ 1 Scan093 | |
| The requirements for a portable lamp, its connection, and supply options. | 1st May 1919 | Box 40 \ 2 Scan001 | |
| Letter from Joseph Lucas Ltd regarding the supply and quotation for Inspection Lamp Plugs. | 3rd Jul 1919 | Box 40 \ 2 Scan002 | |
| Enquiry to supplier Messrs. Lucas about an inspection lamp for a chassis. | 22th Jul 1919 | Box 40 \ 2 Scan003 | |
| Cover memo for correspondence regarding the inspection lamp for the 40/50 chassis. | 7th Aug 1919 | Box 40 \ 2 Scan004 | |
| Supply of an inspection lamp plug for the 40/50 HP chassis. | 1st Aug 1919 | Box 40 \ 2 Scan005 | |
| Confirming a loose plug for the 40/50 HP Chassis inspection lamp will not be supplied. | 6th Aug 1919 | Box 40 \ 2 Scan006 | |
| Request for a suitable plug for an inspection lamp for the Lucas switchboard on chassis 1.EX. | 30th Oct 1919 | Box 40 \ 2 Scan007 | |
| The purchase of Inspection Lamp Plugs from Messrs. Lucas. | 24th Nov 1919 | Box 40 \ 2 Scan008 | |
| Recommendation to modify the inspection lamp plug socket with different diameter pins to prevent incorrect connection for external charging. | 9th Feb 1920 | Box 40 \ 2 Scan009 | |
| Letter from Lucas Electrical discussing a non-reversible 2-pin plug, an associated battery indicator, and a burnt fuse holder. | 18th Feb 1920 | Box 40 \ 2 Scan010 | |
| Car wiring connection sockets and the development of in-house dynamos and starter motors. | 5th Mar 1920 | Box 40 \ 2 Scan011 | |
| Request for the weight and ohmic resistances of competitor dynamos from Lucas and Smith. | 5th Mar 1920 | Box 40 \ 2 Scan012 | |
| Car wiring connection sockets and the development of in-house dynamos. | 5th Mar 1920 | Box 40 \ 2 Scan013 | |
| Request for weight and ohmic resistance data for Lucas and Smith dynamos for winding calculations. | 5th Mar 1920 | Box 40 \ 2 Scan014 | |
| Mr. Royce's request to modify the distribution board design to accommodate charging. | 11th Mar 1920 | Box 40 \ 2 Scan015 | |
| Introduction of a special non-reversible plug for the Lucas switch box for inspection lamps or external charging. | 11th Mar 1920 | Box 40 \ 2 Scan016 | |
| Supply of special plugs for the instrument board's Lucas switchboard. | 30th Mar 1920 | Box 40 \ 2 Scan017 | |
| Clarifying a previous communication regarding the Lucas switchbox plug for inspection lamps. | 31th Mar 1920 | Box 40 \ 2 Scan018 | |
| The wiring requirements for incorporating an inspection lamp plug socket. | 6th Aug 1920 | Box 40 \ 2 Scan019 | |
| Necessary wiring interconnections for a switchbox, incorporating a Smith dynamo and other components. | 10th Aug 1920 | Box 40 \ 2 Scan020 | |
| Letter to S. Smith & Sons requesting a switchbox modification for a polarised socket for an inspection lamp and battery charging. | 6th Aug 1920 | Box 40 \ 2 Scan021 | |
| Arguing against the use of a single distributing fuse due to the risk of multiple system failures. | 8th Aug 1920 | Box 40 \ 2 Scan022 | |
| Letter from S. Smith & Sons regarding the provision of a socket and plug for an inspection lamp on the switchboard. | 10th Aug 1920 | Box 40 \ 2 Scan023 | |
| Technical memo discussing a distribution board for wiring and the design of terminals. | 14th Aug 1920 | Box 40 \ 2 Scan024 | |
| Design of ignition locks and the layout of instrument board fittings for R.R. of America Inc. | 31th Aug 1920 | Box 40 \ 2 Scan025 | |
| Extract detailing design feedback on a lockable ignition switch. | 5th Nov 1920 | Box 40 \ 2 Scan026 | |
| Critical report on a Westinghouse switchbox from car 4-EX returned from America. | 17th Jun 1921 | Box 40 \ 2 Scan027 | |
| Letter discussing the control switch, inspection lamp socket, and instrument board lights for the 4-EX model. | 19th Aug 1921 | Box 40 \ 2 Scan028 | |
| Letter from Rolls-Royce of America regarding the standard practice and provision for fitting an inspection lamp. | 1st Sep 1921 | Box 40 \ 2 Scan029 | |
| Request to order three standard Lucas inspection lamps for the Experimental Department. | 20th Jul 1923 | Box 40 \ 2 Scan030 | |
| Letter from the Paris branch confirming the value of a Grebel spot-light. | 20th Mar 1928 | Box 40 \ 2 Scan031 | |
| Internal request to obtain a sample Lucas spot-light. | 6th Apr 1928 | Box 40 \ 2 Scan032 | |
| Procurement of two spotlights from Joseph Lucas Limited. | 20th Apr 1928 | Box 40 \ 2 Scan033 | |
| Letter concerning two Spot Lights obtained from Joseph Lucas Ltd. | 10th May 1928 | Box 40 \ 2 Scan034 | |
| Confirming the return of two C.A.V. Spot Lights to Stores for sending back to Lucas Ltd. | 1st May 1928 | Box 40 \ 2 Scan035 | |
| Information regarding the Grebel spot light for the 8-EX car, including agents and switching options. | 16th May 1928 | Box 40 \ 2 Scan036 | |
| Inquiry for particulars on a Grebel Spot Light fitted to car 8-EX. | 8th Jun 1928 | Box 40 \ 2 Scan037 | |
| Specifications and potential suppliers for a 'Stephen Grebel, Paris' spot light fitted to an 8-EX car. | 11th Jun 1928 | Box 40 \ 2 Scan038 | |
| The supply of lighting equipment for an experimental Barkerlite Coupe, India III. | 16th Jul 1928 | Box 40 \ 2 Scan039 | |
| The fitting of a Stephen Grebel spot light, a smaller headlamp, and Chrysler type wing lamps. | 16th Jul 1928 | Box 40 \ 2 Scan040 | |
| Arrangement, specifications, and wiring of lamps for the 12-G-4 vehicle model. | 17th Jul 1928 | Box 40 \ 2 Scan041 | |
| Request to supply a Stephen Greble Spot light and a Boa Constrictor Horn, with remaining features to be sent from Derby. | 19th Nov 1928 | Box 40 \ 2 Scan042 | |
| Faulty spotlight on car 18-EX, caused by an earthing issue, and its rectification. | 4th Jan 1929 | Box 40 \ 2 Scan043 | |
| Letter discussing proposals for a central dipped beam lamp and improvements to headlamp diffusion. | 10th Apr 1929 | Box 40 \ 2 Scan044 | |
| Letter discussing development and trials of light bulbs, switches, wing lamps, and screen wipers. | 10th Apr 1929 | Box 40 \ 2 Scan045 | |
| Letter responding to criticism and outlining the manufacturing programme for tail lamps and spot lights. | 10th Apr 1929 | Box 40 \ 2 Scan046 | |
| Letter to M.L. Magneto Works concerning the specification for a six-cylinder magneto for the 40/50 car. | 29th May 1924 | Box 40 \ 2 Scan047 | |
| Letter to suppliers altering the automatic advance specification for a 6-cylinder magneto for the 40/50 car. | 27th Aug 1924 | Box 40 \ 2 Scan048 | |
| Confirming a specification for magnetos is being reviewed by J. Lucas Ltd. | 1st Sep 1925 | Box 40 \ 2 Scan049 | |
| Letter from Joseph Lucas Ltd acknowledging an alteration to the specification of performance for 6-cylinder magnetos. | 1st Sep 1924 | Box 40 \ 2 Scan050 | |
| Letter to Lucas Electric Co. detailing alterations to the specification for a six-cylinder magneto. | 27th Oct 1924 | Box 40 \ 2 Scan051 | |
| Concluding page of a specification document, noting a potential alteration to the speed range. | 3rd Nov 1924 | Box 40 \ 2 Scan052 | |
| Letter from Joseph Lucas Ltd regarding a revised specification for a six-cylinder magneto. | 3rd Nov 1924 | Box 40 \ 2 Scan053 | |
| The suitability of a Lucas Magneto EB.6 print for testing. | 3rd Mar 1925 | Box 40 \ 2 Scan054 | |
| Secret memo from EFC to ROY regarding a magneto for an EAC.2 engine, forwarding notes and specifications from meetings with M.L. Co. and Lucas Elec. Co. | 29th May 1924 | Box 40 \ 2 Scan055 | |
| Forwarding a letter and print from Joseph Lucas Ltd. regarding magnetos for E.A.C. | 7th Oct 1925 | Box 40 \ 2 Scan056 | |
| Letter from Joseph Lucas Limited concerning the development and submission of a magneto for a 40/50 HP chassis. | 6th Oct 1925 | Box 40 \ 2 Scan057 | |
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