| Description | Date | Identifier | |
| Significant number of complaints about unreliable petrol gauges on the Phantom II and 20/25 models. | 22th Jul 1931 | Box 61 \ 3 scan0219 | |
| Telegram from Hobson regarding an arrival to discuss radiator L G 182. | 23th May 1923 | Box 61 \ 3 scan0220 | |
| Letter from H.M. Hobson Ltd. regarding an analysis of faults on latest type fused glass gauges for 25 HP and 40-50 HP cars. | 23th Jul 1931 | Box 61 \ 3 scan0221 | |
| Various vehicle and gauge faults, along with a log from the Gauge Repair Shop. | 23th Jul 1931 | Box 61 \ 3 scan0222 | |
| Faults on returned gauges, including specific order numbers, part numbers, and an analysis of production numbers. | 23th Jul 1931 | Box 61 \ 3 scan0223 | |
| Page 4 of a letter from H. M. Hobson Ltd. regarding serviced gauges of cement joint and fused seal types. | 23th Jul 1931 | Box 61 \ 3 scan0224 | |
| Summary of 'Teligauge' complaints for the June quarter, listing chassis numbers by location. | 15th Nov 1926 | Box 61 \ 3 scan0225 | |
| Letter from H.M. Hobson Ltd. correcting a previous communication about the breakdown of U.S. and English gallon gauges delivered. | 24th Jul 1931 | Box 61 \ 3 scan0226 | |
| Telex confirming the breakdown of delivered fuel gauges into U.S. and English gallon measurements. | 24th Jul 1931 | Box 61 \ 3 scan0227 | |
| Telegram clarifying quantities and specifications for fused seal gauge deliveries. | 31th Jul 1930 | Box 61 \ 3 scan0228 | |
| Telegram message clarifying the quantity and type of gauges delivered, distinguishing between US and English gallons. | 24th Jul 1931 | Box 61 \ 3 scan0229 | |
| Telegram received by telephone regarding the confirmation of a gallon gauge delivery. | 24th Jul 1931 | Box 61 \ 3 scan0230 | |
| Letter from H.M. Hobson Ltd. regarding a new type of liquid for use in gauges in the Experimental Shop. | 29th Jul 1931 | Box 61 \ 3 scan0231 | |
| Test procedures for the K.S. petrol gauge. | 5th Aug 1931 | Box 61 \ 3 scan0232 | |
| Quarterly report on complaints about petrol gauges and the evaluation of potential replacements. | 2nd Aug 1931 | Box 61 \ 3 scan0233 | |
| Letter from H.M. Hobson Ltd. providing an analysis of faults on fused glass gauges for 25 HP and 40/50 HP models. | 23th Jul 1931 | Box 61 \ 3 scan0234 | |
| Log of reported faults and a repair shop's record of gauge repairs. | 14th Jul 1931 | Box 61 \ 3 scan0235 | |
| Letter from H.M. Hobson Ltd. discussing returns, repairs and delivery statistics for different types of gauges. | 22th Aug 1931 | Box 61 \ 3 scan0236 | |
| Despatch of a 25 HP petrol tank to S. Smith & Sons for fitting with an experimental electrical gauge. | 22th Aug 1931 | Box 61 \ 3 scan0237 | |
| Correspondence regarding the fitting of electrical petrol gauges to a 25 HP petrol tank for a road test. | 22th Aug 1931 | Box 61 \ 3 scan0238 | |
| Issues and alternatives for various types of petrol gauges. | 24th Aug 1931 | Box 61 \ 3 scan0239 | |
| Letter from S. Smith & Sons requesting specifications for an electric petrol gauge. | 26th Aug 1931 | Box 61 \ 3 scan0240 | |
| Letter from S. Smith & Sons (Motor Accessories), Ltd. regarding the submission of an instrument set for testing. | 28th Aug 1931 | Box 61 \ 3 scan0241 | |
| Letter to S. Smith & Sons providing specifications for an electrical petrol gauge for a 25 HP car. | 28th Aug 1931 | Box 61 \ 3 scan0242 | |
| Letter concerning the supply of a complete installation from Sunbeam Ltd. for inspection on a 25 HP car. | 28th Aug 1931 | Box 61 \ 3 scan0243 | |
| Letter from supplier S. Smith & Sons regarding the fitment of an electric petrol gauge. | 31th Aug 1931 | Box 61 \ 3 scan0244 | |
| Letter to S. Smith & Sons, Ltd. regarding the petrol tank and baffles for an electrical petrol gauge. | 1st Sep 1931 | Box 61 \ 3 scan0245 | |
| Letter from S. Smith & Sons regarding the fitting of an Electric Petrol Gauge. | 4th Sep 1931 | Box 61 \ 3 scan0246 | |
| Letter to S. Smith & Sons regarding the fitting and testing of an electric petrol gauge. | 7th Sep 1931 | Box 61 \ 3 scan0247 | |
| Letter from S. Smith & Sons regarding a sample Electric Petrol Gauge, a returned tank, and an enclosed wiring diagram. | 21th Sep 1931 | Box 61 \ 3 scan0248 | |
| Proposal for a more aesthetically pleasing Hobson petrol gauge fitting for the 'U' series 25HP petrol tank. | 8th Sep 1931 | Box 61 \ 3 scan0249 | |
| The requirements for a test rig for Herzmark compressors and a Claudel-Hobson petrol pump. | 1st Sep 1931 | Box 61 \ 3 scan0250 | |
| Test scheme for the Herzmark & Co. gear and Claudel-Hobson petrol pump. | 8th Sep 1931 | Box 61 \ 3 scan0251 | |
| Confirming a requested sketch is attached. | 15th Sep 1931 | Box 61 \ 3 scan0252 | |
| Cross-sectional diagram of a Claudel-Hobson petrol pump regulating valve. | 15th Sep 1931 | Box 61 \ 3 scan0253 | |
| Letter to The Nivex Gauge Co. Ltd. about a small gauge that has ceased to function. | 21th Sep 1931 | Box 61 \ 3 scan0254 | |
| Requesting the despatch of a Nivex Petrol Gauge to the manufacturer for rectification. | 21th Sep 1931 | Box 61 \ 3 scan0255 | |
| Test results for a Smith's electric petrol gauge showing actual gallons versus gauge readings. | 29th Sep 1931 | Box 61 \ 3 scan0256 | |
| The fitting of a Smith's Electric Petrol Gauge to vehicle 12-G4. | 30th Sep 1931 | Box 61 \ 3 scan0257 | |
| Letter from Nivex Gauge Limited confirming receipt and planned calibration of a petrol gauge. | 8th Oct 1931 | Box 61 \ 3 scan0258 | |
| Letter to S. Smith & Sons concerning the preliminary testing and proposed modifications for an electric petrol gauge. | 9th Oct 1931 | Box 61 \ 3 scan0259 | |
| Letter from S. Smith & Sons acknowledging feedback on their electric petrol gauge. | 10th Oct 1931 | Box 61 \ 3 scan0260 | |
| Letter from S. Smith & Sons regarding the redesign and calibration of an electric petrol gauge. | 15th Oct 1931 | Box 61 \ 3 scan0261 | |
| Letter to H.M. Hobson Ltd. regarding testing and issues found with a new 18-gallon petrol tank gauge. | 20th Oct 1931 | Box 61 \ 3 scan0262 | |
| Calibration chart for an 18-gallon petrol gauge for a 20 HP vehicle. | 21th Oct 1931 | Box 61 \ 3 scan0263 | |
| Dispatch of one ammeter for an electric petrol gauge to Messrs. S. Smith & Sons Ltd. | 21th Oct 1931 | Box 61 \ 3 scan0264 | |
| Letter to S. Smith & Sons, Ltd. regarding the supply and design requirements for an electric petrol gauge. | 21th Oct 1931 | Box 61 \ 3 scan0265 | |
| Letter from S. Smith & Sons regarding an electric petrol gauge, tank unit, and a damaged ammeter. | 22th Oct 1931 | Box 61 \ 3 scan0266 | |
| Continuation page of a letter from S. Smith & Sons Ltd. | 22th Oct 1931 | Box 61 \ 3 scan0267 | |
| Letter from H.M. Hobson Ltd. regarding the supply and calibration of gauge dials and pipe unions. | 23th Oct 1931 | Box 61 \ 3 scan0268 | |
| Page two of a letter from H.M. Hobson Ltd. about pump line connectors to prevent assembly errors. | 23th Oct 1931 | Box 61 \ 3 scan0269 | |
| Blueprint detailing the connections for a previous and new 3-line scheme for a tank unit. | 23th Oct 1931 | Box 61 \ 3 scan0270 | |
| The 'Metreta' Petrol Level Gauge, discussing its accuracy and suggesting a sample be tested. | 26th Oct 1931 | Box 61 \ 3 scan0271 | |
| Sales and instruction leaflet for the 'Metreta' Level Gauge, detailing its features, fitting instructions, and pricing. | 26th Oct 1931 | Box 61 \ 3 scan0272 | |
| Illustrated guide on the principle and operation of the METRETA liquid level measuring system. | 30th Oct 1931 | Box 61 \ 3 scan0273 | |
| Letter to S. Smith & Sons regarding an electric petrol gauge, requesting cable and dial specifications for upcoming tests. | 30th Oct 1931 | Box 61 \ 3 scan0274 | |
| Letter from a supplier regarding the dispatch of a sample electric petrol gauge. | 30th Oct 1931 | Box 61 \ 3 scan0275 | |
| Service bulletin for the AC Petrol Gauge with a geared type tank unit. | 18th Sep 1931 | Box 61 \ 3 scan0276 | |
| Service bulletin describing the wiring, operation, and features of an AC petrol gauge with a geared type tank unit. | 18th Sep 1931 | Box 61 \ 3 scan0277 | |
| Service bulletin for the AC Petrol Gauge (geared type tank unit) including a troubleshooting chart. | 18th Sep 1931 | Box 61 \ 3 scan0278 | |
| Description of the Claudel-Hobson air-driven petrol pump and its operation. | 30th Oct 1931 | Box 61 \ 3 scan0279 | |
| Tests of a pump and regulator, analysing air consumption against petrol delivery and leakage. | 30th Oct 1931 | Box 61 \ 3 scan0280 | |
| Analysis of a petrol pump's performance, delivery rates, and its interaction with an air compressor and carburetter. | 30th Oct 1931 | Box 61 \ 3 scan0281 | |
| Technical evaluation and summary of an air-driven reciprocating pump and regulator valve system for petrol feed. | 30th Oct 1931 | Box 61 \ 3 scan0282 | |
| Blueprint of a Claudel-Hobson petrol pump regulating valve. | 30th Oct 1931 | Box 61 \ 3 scan0283 | |
| Graph showing air consumption against petrol delivery for a Claudel-Hobson air-driven petrol pump. | 23th Oct 1931 | Box 61 \ 3 scan0284 | |
| Test scheme diagram for a Claudel-Hobson air-driven petrol pump. | 30th Oct 1931 | Box 61 \ 3 scan0285 | |
| Diagram showing a cross-section and external view of a Claudel-Hobson air-driven petrol pump. | 30th Oct 1931 | Box 61 \ 3 scan0286 | |
| Letter from H.M. Hobson Ltd. to Mr. Hives of Rolls-Royce Ltd. confirming a meeting arrangement. | 31th Oct 1931 | Box 61 \ 3 scan0287 | |
| Letter from S. Smith & Sons regarding a sample Electric Petrol Gauge. | 2nd Nov 1931 | Box 61 \ 3 scan0288 | |
| Request to test a newly discovered electrical petrol gauge to replace the existing Hobson gauge. | 3rd Nov 1931 | Box 61 \ 3 scan0289 | |
| Short typed message, likely a telegram, from Hives to Dodson arranging a meeting. | 4th Nov 1931 | Box 61 \ 3 scan0290 | |
| Letter from H.M. Hobson Ltd. regarding a postponed appointment and a carburettor test on a Vauxhall car. | 4th Nov 1931 | Box 61 \ 3 scan0291 | |
| Follow-up enquiry regarding the performance and satisfactory status of different petrol gauges. | 5th Nov 1931 | Box 61 \ 3 scan0292 | |
| Requesting another Smith electric petrol gauge for examination following testing on chassis 18-GIV. | 7th Nov 1931 | Box 61 \ 3 scan0293 | |
| Principle of operation of a Smith electric petrol gauge. | 7th Nov 1931 | Box 61 \ 3 scan0294 | |
| Letter from H. M. Hobson Ltd. concerning the calibration of a K-S Telegage dial for an order. | 7th Nov 1931 | Box 61 \ 3 scan0295 | |
| Blueprint for a gauge to be mounted on an instrument board. | 23th Sep 1931 | Box 61 \ 3 scan0296 | |
| Letter to H.M. Hobson Ltd. regarding the unavailability of a tank for calibration and requesting a Willis Venetian Cream dial. | 12th Nov 1931 | Box 61 \ 3 scan0297 | |
| Letter from H.M. Hobson Ltd. regarding the procurement of an up-to-date petrol pump from the Air Ministry for testing purposes. | 12th Nov 1931 | Box 61 \ 3 scan0298 | |
| Sending a sample of a Smith Electric Petrol Level Indicator for inspection. | 7th Nov 1931 | Box 61 \ 3 scan0299 | |
| Arranging the despatch of a sample Smith Electric Petrol Gauge for the attention of Sir Henry Royce. | 7th Nov 1931 | Box 61 \ 3 scan0300 | |
| Test report on a K.S. Hobson single pipe line petrol gauge on car 27-EX. | 7th Dec 1931 | Box 61 \ 3 scan0301 | |
| Petrol loss during cornering, petrol gauge inaccuracies, and filler neck design issues. | 22th Dec 1931 | Box 61 \ 3 scan0302 | |
| Despatch note to S.Smith & Sons, Ltd. for a 40/50 HP Petrol Tank and a blueprint. | 22th Dec 1931 | Box 61 \ 3 scan0303 | |
| Letter to S. Smith & Sons regarding issues with an electric petrol gauge and requesting a replacement. | 22th Dec 1931 | Box 61 \ 3 scan0304 | |
| Letter from S. Smith & Sons regarding electric petrol gauges. | 28th Dec 1931 | Box 61 \ 3 scan0305 | |
| Letter to S. Smith & Sons regarding the fitting of an 'Earth Return' type electric petrol gauge to a 20-gallon tank. | 1st Jan 1932 | Box 61 \ 3 scan0306 | |
| Letter from S. Smith & Sons regarding the development and demonstration of an electric petrol gauge. | 2nd Jan 1932 | Box 61 \ 3 scan0307 | |
| Loan of a 40/50 HP petrol tank to Messrs. Smith & Sons. | 5th Jan 1932 | Box 61 \ 3 scan0308 | |
| Despatch note for a 25 HP petrol tank F.58208 on loan to S. Smith & Sons Ltd. | 6th Jan 1932 | Box 61 \ 3 scan0309 | |
| Letter to S. Smith & Sons Ltd. regarding the specifications for electric petrol gauges for 18 and 20 gallon tanks. | 12th Jan 1932 | Box 61 \ 3 scan0310 | |
| Blueprint showing alternative suggestions for an electric petrol gauge tank attachment. | 21th Jan 1938 | Box 61 \ 3 scan0311 | |
| Letter from S. Smith & Sons regarding the fitting of electric petrol gauges to 18 and 20-gallon fuel tanks. | 13th Jan 1932 | Box 61 \ 3 scan0312 | |
| Letter from S. Smith & Sons regarding fuel gauge fitting issues and the return of a damaged ammeter. | 13th Jan 1932 | Box 61 \ 3 scan0313 | |
| Letter to S. Smith & Sons Ltd. regarding the design and urgent supply of an electric petrol gauge. | 14th Jan 1931 | Box 61 \ 3 scan0314 | |
| Letter to S. Smith & Sons, Ltd. proposing a simplification of the electric petrol gauge wiring. | 15th Jan 1932 | Box 61 \ 3 scan0315 | |
| Correspondence from S. Smith & Sons regarding modifications and capacity clarification for a petrol tank unit. | 15th Jan 1932 | Box 61 \ 3 scan0316 | |
| Letter from S. Smith & Sons regarding the enclosure of a blueprint for a tank unit arrangement. | 16th Jan 1932 | Box 61 \ 3 scan0317 | |
| Letter from S. Smith & Sons regarding the supply and delivery timeline for specially made electric petrol gauges. | 19th Jan 1932 | Box 61 \ 3 scan0318 | |
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