| Description | Date | Identifier | |
| Sales leaflet for the O.S. Automatic Petrol Gauge for under-bonnet tanks. | 20th Oct 1926 | Box 75 \ 2 scan0174 | |
| Request to forward a petrol tank from car 12-EX to the O.S. Speedometer Co. Ltd. | 20th Oct 1926 | Box 75 \ 2 scan0175 | |
| Letter to O.S. Speedometer Co. Ltd. regarding the modification of a tank to fit their gauge. | 20th Oct 1926 | Box 75 \ 2 scan0176 | |
| Letter from The O.S. Speedometer Co. Ltd. regarding the fitting of a petrol gauge to a tank. | 25th Oct 1926 | Box 75 \ 2 scan0177 | |
| Brochure for O.S. Automatic Petrol Gauges, detailing a visible filler-cap model and a dashboard-mounted rear tank model. | 25th Oct 1926 | Box 75 \ 2 scan0178 | |
| Sales leaflet for the O.S. Automatic Petrol Gauge for under-bonnet tanks. | 16th Nov 1926 | Box 75 \ 2 scan0179 | |
| Letter to the O.S. Speedometer Co. requesting information on a petrol gauge. | 16th Nov 1926 | Box 75 \ 2 scan0180 | |
| Letter from The O.S. Speedometer Co. Ltd. regarding modifications required to fit their gauge to a tank. | 18th Nov 1926 | Box 75 \ 2 scan0181 | |
| Letter to O.S. Speedometer Co. regarding experimentation on a tank and sending a blueprint for modification. | 19th Nov 1926 | Box 75 \ 2 scan0182 | |
| Letter to O.S. Speedometer Co. requesting the expedited delivery of a tank fitted with a gauge. | 9th Dec 1926 | Box 75 \ 2 scan0183 | |
| Letter from O.S. Speedometer Co. Ltd. regarding improvements and adjustments to a Petrol Gauge. | 14th Dec 1926 | Box 75 \ 2 scan0184 | |
| Continuation letter from O.S. Speedometer Co. Ltd. discussing the dispatch and testing of a tank and gauge. | 17th Dec 1926 | Box 75 \ 2 scan0185 | |
| Letter to O.S. Speedometer Co. Ltd. about the delayed delivery of a tank. | 17th Dec 1926 | Box 75 \ 2 scan0186 | |
| Letter to O.S. Speedometer Co. Ltd. chasing the delivery of a promised tank. | 7th Jan 1927 | Box 75 \ 2 scan0187 | |
| Follow-up letter to The O.S. Speedometer Co. requesting an update regarding a tank. | 18th Jan 1927 | Box 75 \ 2 scan0188 | |
| Letter regarding the discontinuation of the mercury gauge due to high material costs and its replacement with a new model. | 21th Jan 1927 | Box 75 \ 2 scan0189 | |
| Advice note from The O.S. Speedometer Co. Ltd. for a returned rear petrol tank. | 10th Feb 1927 | Box 75 \ 2 scan0190 | |
| Letter from The O.S. Speedometer Co. Ltd. regarding a new gauge for a tank to be submitted for testing. | 12th Feb 1927 | Box 75 \ 2 scan0191 | |
| The principle and function of an O.S. Rear Tank Gauge. | 12th Feb 1927 | Box 75 \ 2 scan0192 | |
| Continuation sheet explaining the functioning of the Autovac fuel feed system and its interaction with a gauge. | 15th Mar 1927 | Box 75 \ 2 scan0193 | |
| Letter from O.S. Speedometer Co. Ltd. requesting an opinion on a petrol gauge sent previously. | 15th Mar 1927 | Box 75 \ 2 scan0194 | |
| Letter to the O.S. Speedometer Co. regarding a delay in testing a petrol gauge. | 17th Mar 1927 | Box 75 \ 2 scan0195 | |
| Letter regarding the return of a borrowed gauge due to changes in the petrol feed system. | 7th Nov 1927 | Box 75 \ 2 scan0196 | |
| Instruction to return a tested petrol gauge to Messrs. O.S. Speedometer Ltd. | 7th Nov 1927 | Box 75 \ 2 scan0197 | |
| Requesting experiments to determine the induction pipe length and carburettor placement for aero and chassis engines. | 8th Oct 1908 | Box 75 \ 2 scan0198 | |
| Continued list of technical considerations for a post-war chassis, focusing on induction pipes and the carburetter. | 3rd Oct 1916 | Box 75 \ 2 scan0199 | |
| Instructions for fitting a thin copper water jacket on the water inlet pipes for Chassis 7 CA. | 9th Nov 1916 | Box 75 \ 2 scan0200 | |
| Engine power curves comparing different carburetter and pipe configurations. | 6th Jun 1917 | Box 75 \ 2 scan0201 | |
| Technical note on carburettor performance, induction pipes, and fuel consumption. | 8th Jan 1919 | Box 75 \ 2 scan0202 | |
| Alterations for the 40/50 HP chassis and delegating the required draughting work. | 8th Jan 1919 | Box 75 \ 2 scan0203 | |
| Index of alterations for the 40/50 HP present type chassis. | 18th Dec 1918 | Box 75 \ 2 scan0204 | |
| Carburation experiments and modifications for various engines and chassis. | 26th Apr 1917 | Box 75 \ 2 scan0205 | |
| Scheme for an engine air intake dust elimination system. | 29th Jun 1920 | Box 75 \ 2 scan0206 | |
| Agreeing to standardize the size of copper asbestos washers for induction and exhaust pipes. | 27th Oct 1920 | Box 75 \ 2 scan0207 | |
| Letter from Mr. Hives to Mr. Warwick about issues with American petrol and various component tests. | 20th Dec 1920 | Box 75 \ 2 scan0208 | |
| Request to test and compare the rate petrol passes through Monel Metal gauze versus copper gauze. | 17th Feb 1921 | Box 75 \ 2 scan0209 | |
| Potential improvements to the 40/50 HP induction system and carburettor. | 17th Feb 1921 | Box 75 \ 2 scan0210 | |
| Effectiveness of an alternating plug arrangement in two exhaust manifolds. | 2nd Feb 1921 | Box 75 \ 2 scan0211 | |
| From Mr. Olley to Mr. Hives regarding test results on induction pipes. | 17th Feb 1921 | Box 75 \ 2 scan0212 | |
| Letter from Mr. Olley to Mr. Hives regarding the performance characteristics and findings on an inlet pipe. | 18th Feb 1921 | Box 75 \ 2 scan0213 | |
| Inter-office correspondence regarding inconsistent results with induction pipes and a throttle modification. | 3rd Mar 1921 | Box 75 \ 2 scan0214 | |
| Experimental results of exhaust-heated induction pipes and requesting further information. | 11th Apr 1921 | Box 75 \ 2 scan0215 | |
| Letter from Bennett & Wood Ltd. regarding the shipment of an induction pipe fitting. | 15th Mar 1921 | Box 75 \ 2 scan0216 | |
| Letter acknowledging the receipt of a case containing one Induction Pipe fitting. | 17th Mar 1921 | Box 75 \ 2 scan0217 | |
| Testing a machined induction pipe for the 40/50 chassis, recommending its adoption. | 6th Apr 1921 | Box 75 \ 2 scan0218 | |
| Letter from Bennett & Wood Ltd. inquiring about an induction pipe to potentially reclaim customs duty. | 6th Apr 1921 | Box 75 \ 2 scan0219 | |
| Letter to Bennet & Wood Ltd. clarifying that the induction pipe received from Mr. B.A. Peat is a non-functional model. | 14th Apr 1921 | Box 75 \ 2 scan0220 | |
| Inter-office correspondence discussing engine pre-ignition issues related to heated induction pipes and findings from an engine strip-down. | 27th Apr 1921 | Box 75 \ 2 scan0221 | |
| Engine testing concerning spark plugs, overheating, and gasoline comparisons. | 27th Apr 1921 | Box 75 \ 2 scan0222 | |
| Induction pipe experiments conducted on a 40/50 engine. | 26th May 1921 | Box 75 \ 2 scan0223 | |
| Analysis of liquid petrol accumulation in induction pipes leading to cylinder misfiring and results from various tests. | 25th May 1921 | Box 75 \ 2 scan0224 | |
| The effects and optimal placement of a 'hot spot' on an induction pipe to improve fuel distribution. | 26th May 1921 | Box 75 \ 2 scan0225 | |
| Testing modifications to induction and exhaust pipes related to engine heating. | 26th May 1921 | Box 75 \ 2 scan0226 | |
| The testing of various induction pipes and hot spots to improve engine fuel distribution. | 26th May 1921 | Box 75 \ 2 scan0227 | |
| Further tests conducted on a hot spot pipe, including the use of a deflector and comparisons with American cars, concluding on modifying the throttle. | 26th May 1921 | Box 75 \ 2 scan0228 | |
| Discussion of modifications to the throttle and induction pipe to improve performance with lower-grade fuel in cold conditions. | 26th May 1921 | Box 75 \ 2 scan0229 | |
| Test report comparing the performance of different induction pipe configurations. | 10th Feb 1921 | Box 75 \ 2 scan0230 | |
| Extract regarding U.S.A. complaints and proposed alterations to the induction system. | 8th Jun 1921 | Box 75 \ 2 scan0231 | |
| Abandoning the piston throttle valve in favour of a butterfly valve for the 20 HP model. | 12th Jul 1921 | Box 75 \ 2 scan0232 | |
| Photograph of the left-hand carburetter position and induction pipes. | 12th Jul 1921 | Box 75 \ 2 scan0233 | |
| Inter-office letter discussing the design and testing of heated induction pipes and manifold systems. | 12th Jul 1921 | Box 75 \ 2 scan0234 | |
| Fire risks, throttle controls, and the testing of a new heated pipe design. | 1st Aug 1921 | Box 75 \ 2 scan0235 | |
| Inter-office letter discussing engine pre-ignition problems related to induction pipes and spark plugs. | 1st Aug 1921 | Box 75 \ 2 scan0236 | |
| The causes and characteristics of engine pre-ignition, detonation, and fuel knock. | 1st Aug 1921 | Box 75 \ 2 scan0237 | |
| Letter discussing engine knocking, pre-ignition, fuel volatility, and performance of different gasoline types. | 2nd Aug 1921 | Box 75 \ 2 scan0238 | |
| Inter-office letter discussing induction pipes, thermometers, and preignition in engines. | 2nd Aug 1921 | Box 75 \ 2 scan0239 | |
| Engine detonation, preignition, fuel distribution, and manifold design. | 2nd Aug 1921 | Box 75 \ 2 scan0240 | |
| Intake manifold designs, including a proposal and diagram for a corrugated hot spot. | 3rd Aug 1921 | Box 75 \ 2 scan0241 | |
| Inter-office letter discussing induction pipe vacuum figures and road performance. | 3rd Aug 1921 | Box 75 \ 2 scan0242 | |
| Inter-office letter discussing the problems of 'equal distribution' in induction pipes due to the quality of American gasoline. | 8th Aug 1921 | Box 75 \ 2 scan0243 | |
| Analysis of engine performance using collection bottles on carburettors and induction pipes to study fuel distribution. | 8th Aug 1921 | Box 75 \ 2 scan0244 | |
| Various methods for fuel vaporization and manifold design. | 8th Aug 1921 | Box 75 \ 2 scan0245 | |
| Discussion of various manifold designs intended to improve fuel vaporization to compensate for poor quality gasoline. | 8th Aug 1921 | Box 75 \ 2 scan0246 | |
| Analysis of fuelizer performance and potential developments in induction pipe design. | 8th Aug 1921 | Box 75 \ 2 scan0247 | |
| Analysis of a manifold heating and fuel separation scheme for improving engine performance in cold weather. | 8th Aug 1921 | Box 75 \ 2 scan0248 | |
| Fuel systems, induction pipes, and comparative power tests. | 8th Aug 1921 | Box 75 \ 2 scan0249 | |
| Dynamometer testing procedures, valve timing, and fuel consumption for engine performance evaluation. | 8th Aug 1921 | Box 75 \ 2 scan0250 | |
| Carburetter control, fuel mixture economy, and suggestions for improving mileage. | 9th Aug 1921 | Box 75 \ 2 scan0251 | |
| Letter discussing experiments and results with different types of induction pipes, particularly heated versus unheated. | 9th Aug 1921 | Box 75 \ 2 scan0252 | |
| The effects of a heated pipe, fan cooling, and fuel detonation on engine performance. | 19th Mar 1921 | Box 75 \ 2 scan0253 | |
| Letter urging immediate action on improving a heated induction pipe for better winter performance. | 8th Sep 1921 | Box 75 \ 2 scan0254 | |
| Letter to Hives discussing issues with fuel atomisation in induction pipes, detonation, and potential solutions. | 8th Sep 1921 | Box 75 \ 2 scan0255 | |
| Engine development focusing on induction systems, comparing the performance of drained pipes versus hot spot schemes. | 8th Sep 1921 | Box 75 \ 2 scan0256 | |
| Technical memo discussing carburettor modifications, alternative fuels, and methods to prevent engine boiling. | 8th Sep 1921 | Box 75 \ 2 scan0257 | |
| Engine performance using different fuel mixtures, comparing gasoline and kerosene. | 8th Sep 1921 | Box 75 \ 2 scan0258 | |
| Engine performance test results comparing fuel consumption with different cylinder capacities, throttles, and ignition systems. | 8th Sep 1921 | Box 75 \ 2 scan0259 | |
| Graph plotting fuel consumption (US Pints per BHP hours) against revolutions from a traction dynamometer test. | 8th Sep 1921 | Box 75 \ 2 scan0260 | |
| Graph showing Full Throttle Brake Horse Power on a Speed Traction Dynamometer. | 22th Aug 1921 | Box 75 \ 2 scan0261 | |
| Letter discussing induction pipe arrangements and enclosing secret photographs of the Goshawk 11 engine for a new small car project. | 22th Aug 1921 | Box 75 \ 2 scan0262 | |
| Letter discussing five specific faults with induction pipes on cars in the U.S.A., including starting issues and fuel problems. | 23th Aug 1921 | Box 75 \ 2 scan0263 | |
| Engine fuel distribution, comparing dry gas versus liquid petrol and evaluating the 'Dorris' scheme. | 8th Aug 1921 | Box 75 \ 2 scan0264 | |
| Letter discussing engine performance issues, fuel detonation, and potential solutions involving throttle and shutter adjustments. | 23th Aug 1921 | Box 75 \ 2 scan0265 | |
| Letter discussing a vaporizer scheme, the use of kerosene fuel, and the function of a hot throttle and a Re-Atomizer. | 12th Sep 1921 | Box 75 \ 2 scan0266 | |
| Technical discussion on engine fuel vaporization methods, comparing hot spot and vaporizer schemes for running on various fuels like kerosene. | 12th Sep 1921 | Box 75 \ 2 scan0267 | |
| Request for findings on a vaporiser scheme without a hot throttle. | 20th Sep 1921 | Box 75 \ 2 scan0268 | |
| Technical letter discussing issues with induction pipes, carburation, and potential solutions like the 'Dorris scheme' and exhaust heated throttles. | 20th Sep 1921 | Box 75 \ 2 scan0269 | |
| Report discussing crankcase oil dilution, the 'Dorris scheme', the Goshawk 11 car, and production issues. | 20th Sep 1921 | Box 75 \ 2 scan0270 | |
| Letter discussing the development and performance of a vaporizer scheme and pilot jet, referencing issues with collector rings. | 5th Oct 1921 | Box 75 \ 2 scan0271 | |
| Cold start issues and experiments with air/fuel mixture devices on car engines. | 5th Oct 1921 | Box 75 \ 2 scan0272 | |
| The merits of an exhaust-heated throttle compared to a vaporizer scheme and hot air methods for fuel delivery. | 5th Oct 1921 | Box 75 \ 2 scan0273 | |
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