| Description | Date | Identifier | |
| Letter from S. Smith & Sons regarding the standardisation of 3-wire or single-wire instruments for panels. | 19th Jan 1932 | Box 61 \ 3 scan0319 | |
| Correspondence to S. Smith & Sons Ltd. regarding a delay and specifications for electrical petrol gauges. | 22th Jan 1932 | Box 61 \ 3 scan0320 | |
| Letter from S. Smith & Sons regarding the dispatch of a petrol tank and gauge. | 25th Jan 1932 | Box 61 \ 3 scan0321 | |
| Letter from S. Smith & Sons confirming the despatch of parts for electric petrol gauges. | 27th Jan 1932 | Box 61 \ 3 scan0322 | |
| Letter from H.M. Hobson Ltd. requesting the return of a previously lent fuel pump and diaphragm for updating. | 4th Feb 1932 | Box 61 \ 3 scan0323 | |
| Petrol gauge from Messrs. Smith and Sons used for a 10,000 miles test in France. | 17th Feb 1932 | Box 61 \ 3 scan0324 | |
| Internal request to order a complete electric petrol gauge from Messrs. Smith & Sons for a 16.G.IV car. | 3rd Mar 1932 | Box 61 \ 3 scan0325 | |
| Sending an electric petrol gauge for car 19-EX to Smith & Sons Ltd. for modification to fit a 25HP instrument panel. | 7th Mar 1932 | Box 61 \ 3 scan0326 | |
| Letter to Messrs. H.M. Hobson Ltd. requesting sectional drawings for an air-driven fuel pump and control diaphragm. | 23th Mar 1932 | Box 61 \ 3 scan0327 | |
| Letter from H.M. Hobson Ltd. regarding prints for a Fuel Pump and Control Valve. | 24th Mar 1932 | Box 61 \ 3 scan0328 | |
| Test report on an improved Claudel-Hobson air-driven petrol pump, analyzing its performance and suggesting modifications. | 1st Apr 1932 | Box 61 \ 3 scan0329 | |
| Continuation of a report on pump testing, detailing delivery rates, air consumption, and observations from a Kestrel carburetter test. | 1st Apr 1932 | Box 61 \ 3 scan0330 | |
| Graph showing air consumption versus petrol delivery for an improved model of a Claudel-Hobson air-driven petrol pump. | 24th Mar 1932 | Box 61 \ 3 scan0331 | |
| Requesting the return of a sample Smiths electric petrol gauge that was on loan. | 5th Apr 1932 | Box 61 \ 3 scan0332 | |
| Requesting a covering order for a petrol gauge instrument board unit for a 16-G4 car. | 20th Apr 1932 | Box 61 \ 3 scan0333 | |
| Letter to S. Smith & Sons Ltd. regarding an issue with the petrol gauge needle being caused by its proximity to the speedometer. | 21th Apr 1932 | Box 61 \ 3 scan0334 | |
| Letter from S. Smith & Sons regarding the examination of spindles for a Petrol Gauge Tank Unit. | 27th May 1932 | Box 61 \ 3 scan0335 | |
| The return to production of Smith 'U' Series petrol gauges. | 30th May 1932 | Box 61 \ 3 scan0336 | |
| Requesting an order for a modified 'Peregrine' Petrol Gauge to be used on a 20/25 HP chassis. | 8th Jul 1932 | Box 61 \ 3 scan0337 | |
| Preliminary test report on using a Claudel-Hobson air-driven petrol pump as a hotwell pump for evaporatively cooled engines. | 24th Aug 1932 | Box 61 \ 3 scan0338 | |
| Wiring issues and solutions for the Smith electric petrol gauge. | 30th Sep 1932 | Box 61 \ 3 scan0339 | |
| Letter to Major Seawright of H.M. Hobson Ltd, arranging a meeting at a show and mentioning an electric petrol gauge. | 17th Oct 1932 | Box 61 \ 3 scan0340 | |
| Extract from a letter from S. Smith & Sons regarding improvements to the Smith Petrol Gauge. | 18th Oct 1932 | Box 61 \ 3 scan0341 | |
| Testing of new coils for Smith Electric Petrol Gauges following production failures. | 24th Oct 1932 | Box 61 \ 3 scan0342 | |
| The satisfactory testing of coils for Smith Electric Petrol Gauges. | 9th Nov 1932 | Box 61 \ 3 scan0343 | |
| Letter from S. Smith & Sons confirming dispatch of various gauges and a replacement matt bezel for a car. | 29th Dec 1932 | Box 61 \ 3 scan0344 | |
| Specification for the maximum current of the Smith Electric Petrol Gauge. | 20th Feb 1933 | Box 61 \ 3 scan0345 | |
| Request for the removal and repair of an erratic electric petrol gauge on a green Bentley. | 15th May 1933 | Box 61 \ 3 scan0346 | |
| Letter to Messrs S. Smith & Co. Ltd. regarding failures of electric petrol gauges. | 17th May 1933 | Box 61 \ 3 scan0347 | |
| Request to arrange the return of a faulty Smith electric petrol gauge for Bensport from the Experimental Department. | 17th May 1933 | Box 61 \ 3 scan0348 | |
| Letter from S. Smith & Sons regarding the failure of electric petrol gauges on experimental cars. | 18th May 1933 | Box 61 \ 3 scan0349 | |
| Letter proposing a visit to S. Smith & Sons Ltd. to discuss failures with Electric Petrol Gauges and fitting a fuse. | 16th Jun 1933 | Box 61 \ 3 scan0350 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding a visit to discuss Petrol Gauges. | 17th Jun 1933 | Box 61 \ 3 scan0351 | |
| Letter from S. Smith & Sons discussing replacement petrol gauges, a test plant, and an electric clock. | 23th Jun 1933 | Box 61 \ 3 scan0352 | |
| Letter from S. Smith & Sons concerning the production of new dummy dual instruments. | 23th Jun 1933 | Box 61 \ 3 scan0353 | |
| Letter to S. Smith & Sons Ltd. regarding a faulty Smith Petrol Gauge, model P.751, which is reading high. | 11th Jul 1933 | Box 61 \ 3 scan0354 | |
| Instruction to return a Smith Petrol Gauge No.P.751 to the makers for a free of charge replacement. | 11th Jul 1933 | Box 61 \ 3 scan0355 | |
| Return of a faulty Smith Petrol Gauge and a NEMAG rev clock to supplier Messrs. Smith & Sons Ltd. | 18th Jul 1933 | Box 61 \ 3 scan0356 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding a burnt out Petrol Gauge tank unit. | 28th Jul 1933 | Box 61 \ 3 scan0357 | |
| Investigation into failures of faulty Smith electric petrol gauges in the Test Department. | 28th Jul 1933 | Box 61 \ 3 scan0358 | |
| Notice about the careful handling of delicate instruments with moving iron vanes. | 28th Jul 1933 | Box 61 \ 3 scan0359 | |
| Requesting the urgent repair of a Smith oil gauge removed from an experimental Bentley chassis. | 8th Aug 1933 | Box 61 \ 3 scan0360 | |
| New fuses from S. Smith & Sons Ltd. for petrol meters to be tested and reported on. | 8th Aug 1933 | Box 61 \ 3 scan0361 | |
| Standardisation of the Smith electric petrol gauge with fuse for 20/25 HP and Phantom II chassis. | 19th Jul 1933 | Box 61 \ 3 scan0362 | |
| Standardisation proposal form for a Smiths electric petrol gauge with tube incorporated. | 12th Jul 1933 | Box 61 \ 3 scan0363 | |
| Disputed invoice from S. Smith & Sons Ltd. for three tank attachments. | 12th Sep 1934 | Box 61 \ 3 scan0364 | |
| Letter from S. Smith & Sons regarding an invoice for three tank attachments and a delayed response. | 22th Aug 1934 | Box 61 \ 3 scan0365 | |
| Failed Bentley oil gauge being returned for repair and a report on the cause of failure. | 3rd Nov 1933 | Box 61 \ 3 scan0366 | |
| Recommending against the necessity of carrying a spare fuse for new petrol gauges. | 28th Nov 1933 | Box 61 \ 3 scan0367 | |
| Criticising the design of an electric tail lamp fitting as flimsy and not weatherproof, suggesting a more robust screw-up contact. | 4th Jan 1912 | Box 61a \ 1 scan0001 | |
| To Mr. Johnson regarding the difficulty in getting a good electrical contact on tail lamps. | 7th Oct 1911 | Box 61a \ 1 scan0002 | |
| Monograph on the theory and practice of Acetylene and Electric headlamp design, Part I covering the production of a suitable beam. | 23th Nov 1912 | Box 61a \ 1 scan0003 | |
| Page from 'The Autocar' magazine discussing the optical principles of vehicle headlamps, including lenses and reflectors. | 23th Nov 1912 | Box 61a \ 1 scan0004 | |
| Comparative tests of C.A.V. and Lucas lamps, detailing light distances and weights. | 6th Jan 1913 | Box 61a \ 1 scan0005 | |
| Preference for smaller 'F. medium' headlamps over the larger 'G. large' type, with remarks from Mr. Royce. | 6th Jan 1913 | Box 61a \ 1 scan0006 | |
| The C.A.V. Dynamo and lighting system for chassis 2301. | 22th Apr 1913 | Box 61a \ 1 scan0007 | |
| Internal inquiry regarding experience with the Besnard make of head lamps for a customer, Mr. Balamanca. | 17th Nov 1913 | Box 61a \ 1 scan0008 | |
| Response to Mr. Salamanca's enquiries regarding the fitment of Bosch dynamos and Besnard head lamps. | 19th Feb 1920 | Box 61a \ 1 scan0009 | |
| Request to conduct comparative tests on the lighting intensity of various headlamps. | 28th Jul 1914 | Box 61a \ 1 scan0010 | |
| Comparative tests on the power of light of various types of head lamps. | 19th Oct 1914 | Box 61a \ 1 scan0011 | |
| Results of tests comparing different 12-volt light bulbs. | 19th Oct 1914 | Box 61a \ 1 scan0012 | |
| Specification table for various lamp and bulb combinations with associated measurements. | 19th Oct 1914 | Box 61a \ 1 scan0013 | |
| Issues with electric lighting systems, focusing on the dynamo, battery, and control rather than the lamps themselves. | 23th Oct 1914 | Box 61a \ 1 scan0014 | |
| Issues with a dynamo and pulley system, suggesting a replacement with a lower speed dynamo. | 23th Oct 1914 | Box 61a \ 1 scan0015 | |
| Instruction note regarding sending one Bleriot Head Light into stores to be returned. | 23th Oct 1914 | Box 61a \ 1 scan0016 | |
| C.A.V. cut-out fitting and electrical system design. | 27th Oct 1914 | Box 61a \ 1 scan0017 | |
| Vehicle lighting systems, voltage regulation, and a proposal to test a Bijur constant voltage system. | 27th Oct 1914 | Box 61a \ 1 scan0018 | |
| The selection of electrical components like self-starters, dynamos, and regulators for a chassis. | 27th Oct 1914 | Box 61a \ 1 scan0019 | |
| Critique of a C.A.V. component fitting, noting its impracticality and poor securing method. | 27th Oct 1914 | Box 61a \ 1 scan0020 | |
| Road testing various C.A.V. head lamps and bulbs to determine the best combination for driving light. | 23th Nov 1914 | Box 61a \ 1 scan0021 | |
| Note comparing the Ediswan spiral filament to the Osram wavy type filament. | 1st Dec 1914 | Box 61a \ 1 scan0022 | |
| The suitability of Ediswan bulbs and the practicalities of fitting large C.A.V. or Lucas headlamps. | 1st Dec 1914 | Box 61a \ 1 scan0023 | |
| Impracticality of a recommended large high-speed lamp due to difficulty with the starting handle. | 11th Feb 1914 | Box 61a \ 1 scan0024 | |
| And comparing the dimensions of various headlamps from C.A.V. and Lucas. | 3rd Dec 1914 | Box 61a \ 1 scan0025 | |
| Testing half-watt, 4-amp bulbs for use with C.A.V. lamps. | 16th Dec 1914 | Box 61a \ 1 scan0026 | |
| Technical discussion regarding the design and efficiency of Lucas headlamps and reflectors. | 16th Dec 1914 | Box 61a \ 1 scan0027 | |
| Selection of a suitable headlamp based on recent experiments. | 23th Dec 1914 | Box 61a \ 1 scan0028 | |
| Request for a recommendation on suitable headlamps not exceeding 11 inches in diameter. | 24th Dec 1914 | Box 61a \ 1 scan0029 | |
| Desirable type of electric headlamp and its specifications. | 4th Jan 1915 | Box 61a \ 1 scan0030 | |
| Powerful and potentially disagreeable nature of certain lamps fitted to a car. | 2nd Mar 1915 | Box 61a \ 1 scan0031 | |
| Guide on two methods to test the candle-power of vehicle lamps to comply with lighting regulations. | 2nd Mar 1915 | Box 61a \ 1 scan0032 | |
| Guide on how to test and compare the illuminating power of vehicle lamps using a candle and specific measurements. | 2nd Mar 1915 | Box 61a \ 1 scan0033 | |
| Chassis lighting and ignition system, focusing on the choice of dynamo and other components. | 14th Nov 1918 | Box 61a \ 1 scan0034 | |
| Continued note discussing issues with faulty lamps and the arrangement for a 12-volt non-trembler ignition system. | 14th Nov 1918 | Box 61a \ 1 scan0035 | |
| Querying specifications for a new car lighting system and requesting competitor catalogues. | 14th Nov 1918 | Box 61a \ 1 scan0036 | |
| Letter from Holophane Limited regarding the design and standardisation of a new anti-glare Glass Reflector Plate for headlights. | 20th Nov 1918 | Box 61a \ 1 scan0037 | |
| Letter to Holophane Limited about fitting reflector plates to C.A.V. headlamps for a road trial. | 1st Jan 1919 | Box 61a \ 1 scan0038 | |
| Authoritative article discussing the power of motor lamps, anti-dazzle devices, and suggested regulations. | 4th Jan 1919 | Box 61a \ 1 scan0039 | |
| Reprint of a 1919 article from 'The Light Car and Cyclecar' discussing anti-dazzle solutions for car headlights. | 4th Jan 1919 | Box 61a \ 1 scan0040 | |
| Letter from Holophane Limited regarding head lamp plates and samples. | 11th Jan 1919 | Box 61a \ 1 scan0041 | |
| The fitting of special headlamp plates to C.A.V. lamps by Holphane Co., Ltd. | 14th Jan 1919 | Box 61a \ 1 scan0042 | |
| Letter to The Lucid Lamp Co. about their Anti-glare Device for headlamps. | 19th Mar 1919 | Box 61a \ 1 scan0043 | |
| Letter from The Lucid Lamp Co. Ltd. regarding official sanction for their Lucid Non-Dazzle Shade. | 20th Mar 1919 | Box 61a \ 1 scan0044 | |
| Extract listing sample lamps to be supplied by Messrs. Lucas, with specific type numbers for head, side, and tail lamps. | 7th May 1919 | Box 61a \ 1 scan0045 | |
| Technical description of the actuator box, motor gearing, and lamp specifications. | 26th May 1919 | Box 61a \ 1 scan0046 | |
| Letter from Joseph Lucas Ltd. to Rolls-Royce concerning electrical equipment, junction boxes, and a fitter's visit. | 30th May 1919 | Box 61a \ 1 scan0047 | |
| Letter to Lucas Ltd. concerning parts for the first Post-War Experimental Car. | 3rd Jun 1919 | Box 61a \ 1 scan0048 | |
| Letter from Holophane Limited regarding their ability to now supply samples of Motor Lenses. | 18th Jul 1919 | Box 61a \ 1 scan0049 | |
| Letter from Holophane Limited regarding a new glass reflector plate for headlights to reduce glare and requesting lantern dimensions. | 15th Nov 1918 | Box 61a \ 1 scan0050 | |
| Requesting the return of two unused Lucas side lamps to the supplier, as they were not required for the experimental car 1 EX. | 23th Jul 1919 | Box 61a \ 1 scan0051 | |
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