| Description | Date | Identifier | |
| Stamped document from the Print Room in Derby. | 14th Jun 1927 | Box 40 \ 4 Scan257 | |
| Graph comparing Autovac petrol delivery for a standard pipe versus a 3/8' pipe at various engine RPMs under half throttle. | 13th Jun 1927 | Box 40 \ 4 Scan258 | |
| Graph plotting the effect of petrol supply pipe size on Autovac delivery against engine RPM. | 13th Jun 1927 | Box 40 \ 4 Scan259 | |
| Blank page with a 'Print Room' stamp from Derby. | 14th Jun 1927 | Box 40 \ 4 Scan260 | |
| Replacement and examination of an Autovac and Tank for chassis 23-EU, owned by Major Burnham. | 14th Jun 1927 | Box 40 \ 4 Scan261 | |
| Irregular running on Chassis 23-EU, identifying a faulty autovac and arranging a replacement for experimental purposes. | 17th May 1927 | Box 40 \ 4 Scan262 | |
| Testing of an autovac petrol feed system from chassis 23-EU. | 6th Jul 1927 | Box 40 \ 4 Scan263 | |
| Continued note suggesting potential engine faults, including leaks in the induction system or a poor autovac cork washer. | 8th Jul 1927 | Box 40 \ 4 Scan264 | |
| Issues of slow running and misfiring related to the Autovac petrol feed system. | 8th Jul 1927 | Box 40 \ 4 Scan265 | |
| Petrol vaporization in the Autovac tank causing engine starvation and the testing of a heat shield as a solution. | 19th Jul 1927 | Box 40 \ 4 Scan266 | |
| From ROY discussing making Autovacs under license and requesting information on the Grav-Vac. | 17th Oct 1927 | Box 40 \ 4 Scan267 | |
| Letter to RR America Inc. regarding a report on Vacuum Feed and the future use of an engine-driven vacuum pump. | 19th Oct 1927 | Box 40 \ 4 Scan268 | |
| Tests on the vacuum feed system, focusing on suction connection positions and their effect on engine idling. | 19th Oct 1927 | Box 40 \ 4 Scan269 | |
| Road and idling tests on engine performance with different vacuum line connections and vacuum tank systems. | 19th Oct 1927 | Box 40 \ 4 Scan270 | |
| Condemning a permanent restriction on a piston valve and its effect on the vacuum system. | 20th Oct 1927 | Box 40 \ 4 Scan271 | |
| Standardisation of a larger diameter petrol pipe to reduce the risk of Autovac failure. | 20th Oct 1927 | Box 40 \ 4 Scan272 | |
| Proposal to cancel the standardisation sheet for a larger diameter petrol pipe following disagreement on modifications. | 7th Nov 1927 | Box 40 \ 4 Scan273 | |
| Downward lead and bore of the petrol pipe from the autovac to the filter. | 30th Nov 1927 | Box 40 \ 4 Scan274 | |
| Weir induction pipe for models EAC.14 and EAC.10. | 13th Jan 1928 | Box 40 \ 4 Scan275 | |
| Repositioning of the EAC.10 Autovac. | 21th Jan 1928 | Box 40 \ 4 Scan276 | |
| High cost of Autovacs from the Autovac Company and exploring alternatives. | 20th Apr 1928 | Box 40 \ 4 Scan277 | |
| Suggesting the standard fitment of a Drain Sump and Plug (F.74297) to all Phantom Autovacs. | 25th Apr 1928 | Box 40 \ 4 Scan278 | |
| Arrangements for an Autovac instrument to be transferred to the Experimental Department. | 11th May 1928 | Box 40 \ 4 Scan279 | |
| The testing of a Grav-vac vacuum petrol feed tank and its performance compared to the standard Autovac system. | 10th Jul 1928 | Box 40 \ 4 Scan280 | |
| Recommendations for altering a valve mechanism from direct to indirect operation. | 26th Jun 1928 | Box 40 \ 4 Scan281 | |
| Technical report comparing the Grav-vac vacuum feed tank with the Autovac system, detailing faults and performance. | 26th Jun 1928 | Box 40 \ 4 Scan282 | |
| Petrol suction pump tests for the 'SS' engine and the resulting fuel delivery figures when using a standard autovac. | 3rd Sep 1928 | Box 40 \ 4 Scan283 | |
| Analysis of piston and port operation within an autovac system, including pressure measurements. | 3rd Sep 1928 | Box 40 \ 4 Scan284 | |
| Improvements to pump efficiency, autovac suction, and lubrication of ignition and dynamo components. | 4th Sep 1928 | Box 40 \ 4 Scan285 | |
| Blueprint illustrating the operation of an S.S. Vacuum Pump at different stages of the piston stroke. | 4th Sep 1928 | Box 40 \ 4 Scan286 | |
| Performance graph for the Vacuum Pump on the Super Sports Engine, plotting delivery and suction against engine RPM. | 1st Sep 1928 | Box 40 \ 4 Scan287 | |
| Query regarding a mysterious, intermittent Autovac issue on Phantom models at speeds of 60 M.P.H. or over. | 14th Nov 1928 | Box 40 \ 4 Scan288 | |
| Autovac failures on the Phantom model, including flap valve issues and petrol line gassing. | 19th Nov 1928 | Box 40 \ 4 Scan289 | |
| Recommendation to avoid the use of Aviation and other highly volatile spirits. | 1st Dec 1928 | Box 40 \ 4 Scan290 | |
| Change to the 'SS' petrol feed system, making the Autovac piston type suction elbow obsolete. | 1st Dec 1928 | Box 40 \ 4 Scan291 | |
| Petrol flow issues in the Autovac petrol feed for Phantom & 'SS' models, proposing a modification to the tap. | 2nd Apr 1929 | Box 40 \ 4 Scan292 | |
| Continuation note on the importance of correct drilling in the manufacture of taps for the fuel system. | 13th Feb 1929 | Box 40 \ 4 Scan293 | |
| Scheme for a modified Autovac petrol feed tap with larger petrol ways. | 13th Feb 1929 | Box 40 \ 4 Scan294 | |
| Design suggestions for a petrol reserve device in the Autovac system. | 14th Feb 1929 | Box 40 \ 4 Scan295 | |
| Modification of a two-level device, likely a fuel tap, for an Autovac system, including a diagram of its operation. | 1st Feb 1929 | Box 40 \ 4 Scan296 | |
| Sheet for a vent pipe from the petrol filter to the Autovac tank. | 12th Apr 1929 | Box 40 \ 4 Scan297 | |
| Requesting an alteration to the stand pipe (F80638) in S.S. Autovac Tanks. | 8th Jul 1929 | Box 40 \ 4 Scan298 | |
| Letter to The Autovac Co. regarding proposed modifications to improve Autovac delivery by altering the float and its chamber. | 15th Aug 1929 | Box 40 \ 4 Scan299 | |
| Letter from Autovac Manufacturing Co. Ltd acknowledging receipt of a letter regarding alterations to Autovacs. | 16th Aug 1929 | Box 40 \ 4 Scan300 | |
| Standard production test procedure for the Autovac petrol supply system. | 16th Aug 1929 | Box 40 \ 4 Scan301 | |
| Testing of Autovacs to prevent insufficient petrol supply issues. | 20th Aug 1929 | Box 40 \ 4 Scan302 | |
| Letter from Autovac Manufacturing Co. Ltd. requesting pump suction, delivery, lift height and piping length specifications. | 20th Aug 1929 | Box 40 \ 4 Scan303 | |
| Proposed modification to overcome over-oiling on the vacuum pump by discharging its exhaust into the crankcase. | 22th Aug 1929 | Box 40 \ 4 Scan304 | |
| Letter to the Autovac Manufacturing Co. detailing a standard test procedure for Autovac fuel systems. | 27th Aug 1929 | Box 40 \ 4 Scan305 | |
| The second page of a typed letter. | 28th Aug 1929 | Box 40 \ 4 Scan306 | |
| Requesting an update on a reply from Autovac Manufacturing Co. Ltd. regarding Autovacs. | 28th Aug 1929 | Box 40 \ 4 Scan307 | |
| Letter from Autovac Manufacturing Co. Ltd. acknowledging a letter and awaiting a vacuum pump for reporting. | 28th Aug 1929 | Box 40 \ 4 Scan308 | |
| Requesting a vacuum pump piston connecting rod and eccentric be sent to Autovac Manfg. Co. Ltd. for testing. | 29th Aug 1929 | Box 40 \ 4 Scan309 | |
| Letter to The Autovac Manufacturing Co. Ltd. regarding the despatch of a vacuum pump cylinder, connecting rod, cam, and blueprint. | 19th Sep 1929 | Box 40 \ 4 Scan310 | |
| Follow-up letter from The Autovac Manufacturing Co. Ltd regarding an undelivered Vacuum Pump. | 19th Sep 1929 | Box 40 \ 4 Scan311 | |
| Letter from The AutoVac Manufacturing Co. Ltd. acknowledging receipt of a letter, vacuum pump and blueprint. | 20th Sep 1929 | Box 40 \ 4 Scan312 | |
| Letter from The Autovac Manufacturing Co. Ltd. regarding experiments conducted on their patent Autovac apparatus. | 11th Oct 1929 | Box 40 \ 4 Scan313 | |
| Letter from Autovac Manufacturing Co. Ltd. detailing the results of four tests on an apparatus using a Suction Pump. | 15th Oct 1929 | Box 40 \ 4 Scan314 | |
| Test results for an Autovac pump showing flow rates under various valve and tank configurations. | 15th Oct 1929 | Box 40 \ 4 Scan315 | |
| Diagram and test results for a petrol lift system using an Autovac. | 17th Oct 1929 | Box 40 \ 4 Scan316 | |
| Letter to Autovac Manufacturing Co., Ltd., discussing a heavier float and non-return valve for an autovac system. | 17th Oct 1929 | Box 40 \ 4 Scan317 | |
| Letter from The Autovac Manufacturing Co. Ltd arranging a visit from Mr. Ardern. | 19th Oct 1929 | Box 40 \ 4 Scan318 | |
| Letter from The Autovac Manufacturing Co. Ltd. arranging a visit to see Mr. Robotham. | 19th Oct 1929 | Box 40 \ 4 Scan319 | |
| Letter from the Autovac Manufacturing Co. Ltd. detailing test results for their patented fuel delivery apparatus after modifications. | 30th Oct 1929 | Box 40 \ 4 Scan320 | |
| Letter from The Autovac Manufacturing Co. Ltd. regarding the performance of Valve AV.357 and an offer of an apparatus for testing. | 30th Oct 1929 | Box 40 \ 4 Scan321 | |
| Test results for an Autovac suction pump detailing petrol delivery rates with different valve configurations. | 30th Oct 1929 | Box 40 \ 4 Scan322 | |
| Blueprint showing different views and modifications of a drop valve. | 30th Oct 1929 | Box 40 \ 4 Scan323 | |
| Blueprint showing three orthographic views of a mechanical component from The Autovac Manufacturing Co. Ltd. | 18th Nov 1929 | Box 40 \ 4 Scan324 | |
| Letter to The Autovac Mfg. Co. Ltd. regarding testing alterations to a drip valve and a non-return valve. | 18th Nov 1929 | Box 40 \ 4 Scan325 | |
| Letter from Autovac Manufacturing Co. Ltd. regarding the dispatch of an Inner Tank fitted with a Wire Type Drop Valve. | 19th Nov 1929 | Box 40 \ 4 Scan326 | |
| Order acknowledgment from Autovac Manufacturing Co. Ltd. for a sample inner tank with a wire type drop valve. | 19th Nov 1929 | Box 40 \ 4 Scan327 | |
| Visit from the Autovac Company's Works Manager to demonstrate a special glass model of their apparatus. | 16th Apr 1930 | Box 40 \ 4 Scan328 | |
| Letter from the Vacuum Oil Company about recommended lubricants for gear boxes and back axles and an engineer's visit. | 26th Apr 1930 | Box 40 \ 4 Scan329 | |
| Engineering memorandum from Vacuum Oil Company Ltd. detailing Mobiloil gear lubricants. | 17th Apr 1930 | Box 40 \ 4 Scan330 | |
| From the Vacuum Oil Company detailing the properties and applications of various automotive lubricants. | 28th Apr 1930 | Box 40 \ 4 Scan331 | |
| Letter from the Vacuum Oil Company describing the properties of a lubricant that is technically a grease but has the qualities of a high-grade gear oil. | 28th Apr 1930 | Box 40 \ 4 Scan332 | |
| Letter from the Vacuum Oil Company, Limited acknowledging a previous letter. | 22th Apr 1930 | Box 40 \ 4 Scan333 | |
| Letter to The Vacuum Oil Co. Limited requesting their latest recommendation chart for oils for Gear Boxes and Back Axles. | 17th Apr 1930 | Box 40 \ 4 Scan334 | |
| Investigation into failures of the Autovac petrol feed system due to leaking floats. | 1st May 1930 | Box 40 \ 4 Scan335 | |
| Float failures, valve mechanism issues, and suction pump discharge recommendations. | 1st May 1930 | Box 40 \ 4 Scan336 | |
| Test report on three different Autovac self-draining floats to investigate failures. | 20th Apr 1934 | Box 40 \ 4 Scan337 | |
| Page two of a test report detailing experiments on an Autovac float chamber under various conditions. | 20th Apr 1934 | Box 40 \ 4 Scan338 | |
| Investigation into autovac float failures caused by petrol vapour condensation after heating. | 22th May 1930 | Box 40 \ 4 Scan339 | |
| Testing four new aluminium die-cast Autovac covers to replace existing brass ones due to concerns over screw thread durability. | 22th May 1930 | Box 40 \ 4 Scan340 | |
| Returning autovac tanks with aluminium tops for modifications as per drawings AV.226 and AV.357. | 4th Jun 1930 | Box 40 \ 4 Scan341 | |
| Letter from the Autovac Manufacturing Co. Ltd. regarding the despatch of an AUTOVAC apparatus and a demonstration model. | 24th Jun 1930 | Box 40 \ 4 Scan342 | |
| Inquiry regarding the production commencement of a larger Autovac valve for the Phantom II to resolve petrol-related issues. | 4th Jul 1930 | Box 40 \ 4 Scan343 | |
| The testing of a modified self-draining float for the Autovac petrol feed system. | 4th Jul 1930 | Box 40 \ 4 Scan344 | |
| The functionality of a self-draining float in an Autovac tank and a recommendation for modification. | 1st Jul 1930 | Box 40 \ 4 Scan345 | |
| Standardisation of a larger Autovac valve for chassis to overcome petrol starvation at high speeds. | 4th Jun 1930 | Box 40 \ 4 Scan346 | |
| Dispatch of a special Autovac head with a larger drop valve to be fitted to a car. | 19th Jul 1930 | Box 40 \ 4 Scan347 | |
| Despatch of one Autovac head to be fitted to a car. | 19th Jul 1930 | Box 40 \ 4 Scan348 | |
| Following up on a recommendation to modify the Autovac battery feed's self-draining float. | 28th Jul 1930 | Box 40 \ 4 Scan349 | |
| The production status and delivery of the Autovac battery feed self-draining float. | 14th Aug 1930 | Box 40 \ 4 Scan350 | |
| Letter from the Autovac Manufacturing Co. Ltd. regarding a delay in sending a glass model of their patented apparatus. | 12th Feb 1931 | Box 40 \ 4 Scan351 | |
| Letter from The Autovac Manufacturing Co. Ltd. requesting the return of a Patent AUTOVAC Apparatus model sent for experiments. | 17th Apr 1931 | Box 40 \ 4 Scan352 | |
| Letter to the Autovac Mfg Co. Ltd. regarding the return of a loaned 'Autovac' apparatus which was damaged during testing. | 22th Apr 1931 | Box 40 \ 4 Scan353 | |
| Letter from The Autovac Manufacturing Co. Ltd. acknowledging receipt of a loaned Glass Model for experimental purposes. | 23th Apr 1931 | Box 40 \ 4 Scan354 | |
| Letter to Autovac Manufacturing Co. Ltd. regarding a faulty autovac tank unit from an experimental car. | 17th Dec 1931 | Box 40 \ 4 Scan355 | |
| Letter from The AutoVac Manufacturing Co. Ltd. acknowledging the return of a Patent AUTOVAC Apparatus for examination. | 18th Dec 1931 | Box 40 \ 4 Scan356 | |
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