| Description | Date | Identifier | |
| Piston ring design, comparing different types to improve gas tightness and prevent crankcase vapour. | 1st Apr 1920 | Box 77 \ 3 scan0231 | |
| Comparison of horsepower (HP) for an engine with cast iron vs. aluminium pistons, and HP tests with different numbers of piston rings. | 12th Apr 1920 | Box 77 \ 3 scan0232 | |
| Listing different piston designs that have been passed for testing. | 1st Jul 1920 | Box 77 \ 3 scan0233 | |
| Design remarks for a split aluminium piston on a 40/50 HP chassis. | 28th Jan 1920 | Box 77 \ 3 scan0234 | |
| Modifications to aluminium and split cast iron pistons. | 28th Jan 1920 | Box 77 \ 3 scan0235 | |
| Modifications to an aluminium split piston for a 40/50 chassis. | 10th Feb 1920 | Box 77 \ 3 scan0236 | |
| Design changes to a split aluminium piston for the 40/50 HP chassis. | 18th Feb 1920 | Box 77 \ 3 scan0237 | |
| Continued note on piston design for a lighter and more durable result. | 2nd Feb 1920 | Box 77 \ 3 scan0238 | |
| Modifications to an aluminium split piston for a 40/50 chassis following engine seizing tests. | 2nd Feb 1920 | Box 77 \ 3 scan0239 | |
| Use of liners on pistons to achieve high and low compression and agreeing with a suggestion to use standard cylinders without liners. | 11th Jun 1920 | Box 77 \ 3 scan0240 | |
| Use of a liner between the cylinder and crankcase for low and high compression engines. | 14th Jun 1920 | Box 77 \ 3 scan0241 | |
| The decision to abolish the liner used with low compression pistons for early postwar cars. | 16th Jun 1920 | Box 77 \ 3 scan0242 | |
| The decision to abolish cylinder liners and providing blueprints for a new experimental flexible split piston. | 22th Jun 1920 | Box 77 \ 3 scan0243 | |
| The alteration of pistons for a low compression engine. | 25th Jun 1920 | Box 77 \ 3 scan0244 | |
| Instruction to the Works to produce patterns for a low compression piston and to proceed with standardization. | 26th Jul 1920 | Box 77 \ 3 scan0245 | |
| Distributing standardisation sheets for a wearing strip, oil feed, and piston. | 9th Aug 1920 | Box 77 \ 3 scan0246 | |
| Standardisation of a flexible split piston for use without cylinder liners. | 30th Jul 1920 | Box 77 \ 3 scan0247 | |
| Status and requirements for three new standardized parts for 'E' units. | 20th Sep 1920 | Box 77 \ 3 scan0248 | |
| Extract from a memo discussing potential improvements and standardization for 'R' Series material, covering switches, pistons, and magnetos. | 2nd Feb 1921 | Box 77 \ 3 scan0249 | |
| Drawing Lec.1069 for a 20 HP chassis piston and connecting rod, detailing design choices and modifications. | 24th Mar 1919 | Box 77 \ 3 scan0250 | |
| Print for a 20 Hp. Piston & Connecting Rod. | 2nd Apr 1919 | Box 77 \ 3 scan0251 | |
| Notification regarding the receipt of piston rings from the British Chuck & Piston Ring Co. for an experiment. | 20th Jun 1919 | Box 77 \ 3 scan0252 | |
| Listing the parts fitted to a 'Goshawk' engine for testing. | 20th Sep 1920 | Box 77 \ 3 scan0253 | |
| Instruction regarding the 'N' Scheme 852 for the Goshawk II piston and connecting rod, putting a previous memo on hold. | 2nd May 1921 | Box 77 \ 3 scan0254 | |
| Design and manufacture of the 'Goshawk II' engine's connecting rod, piston, and combustion space. | 1st May 1921 | Box 77 \ 3 scan0255 | |
| Design and manufacturing options for engine components, including pistons and connecting rods. | 1st May 1921 | Box 77 \ 3 scan0256 | |
| Drawing for the minimum dimensions of a connecting rod. | 18th Jun 1921 | Box 77 \ 3 scan0257 | |
| The creation of two urgent wooden models for a Goshawk 11 connecting rod and piston. | 18th May 1921 | Box 77 \ 3 scan0258 | |
| Design modifications for the 'Goshawk II' piston and connecting rod. | 28th May 1921 | Box 77 \ 3 scan0259 | |
| Design and testing of a cast iron piston for the Goshawk 11 engine, including decisions made by Mr. Royce. | 16th Sep 1921 | Box 77 \ 3 scan0260 | |
| Advantages of using aluminium pistons over cast iron to reduce engine detonation. | 17th Oct 1921 | Box 77 \ 3 scan0261 | |
| Drawing modifications for the Goshawk 11 engine to address an over-oiling issue. | 10th Nov 1921 | Box 77 \ 3 scan0262 | |
| Comparative study of piston designs 'Gos I' and 'Gos II' against a '40/50' model, with dimensioned drawings and tables of area and ratio calculations. | 17th Feb 1924 | Box 77 \ 3 scan0263 | |
| Fixing excessive oil consumption and smokey exhaust in Goshawk engines by modifying the piston scraper ring. | 10th Oct 1922 | Box 77 \ 3 scan0264 | |
| Adoption of a bevelled scraper ring for maximum efficiency over other methods. | 15th Nov 1922 | Box 77 \ 3 scan0265 | |
| Standardisation sheet for a bevel on a scraper piston ring, reference X No.4224½. | 15th Nov 1922 | Box 77 \ 3 scan0266 | |
| Standardisation of a bevel on scraper piston rings to address over-oiling and smoking in Goshawk cars. | 14th Nov 1922 | Box 77 \ 3 scan0267 | |
| Modifications to the 20 HP engine's latest oiling arrangement to address smoky exhaust issues. | 30th Dec 1922 | Box 77 \ 3 scan0268 | |
| The advantages of ample engine lubrication during a trial run. | 30th Dec 1922 | Box 77 \ 3 scan0269 | |
| Effectiveness of a beveled lower scraper ring in preventing overoiling. | 19th Jan 1923 | Box 77 \ 3 scan0270 | |
| Test results on bevelled piston scraper rings. | 1st Feb 1923 | Box 77 \ 3 scan0271 | |
| Comparison of piston distances from Top Dead Centre (T.D.C.) for Goshawk 11 and Swashplate pistons at various crank angles. | 19th Jul 1923 | Box 77 \ 3 scan0272 | |
| Fitting aluminium pistons for 40/50 and 20 HP chassis, addressing issues with seizing and knocking. | 4th Oct 1923 | Box 77 \ 3 scan0273 | |
| Standardizing piston testing procedures to reduce expense and service failures. | 10th Oct 1923 | Box 77 \ 3 scan0274 | |
| Testing of taper ground pistons for a 20 HP chassis. | 10th Oct 1923 | Box 77 \ 3 scan0275 | |
| Request for a report on the 20 HP chassis pistons and taper grinding. | 24th Oct 1923 | Box 77 \ 3 scan0276 | |
| Standardisation of chassis parts, specifically the grinding of pistons for the 40/50 HP and 20 HP chassis. | 4th Oct 1923 | Box 77 \ 3 scan0277 | |
| Recommendation to standardize pistons with taper grinding for the 20 HP chassis following successful testing. | 1st Nov 1923 | Box 77 \ 3 scan0278 | |
| Design of E.A.C.11 and Goshawk 11 pistons, specifically the piston pins and plugs. | 8th Jul 1924 | Box 77 \ 3 scan0279 | |
| The mounting of a Brigg's Petrol Pump on the Falcon engine. | 2nd Oct 1918 | Box 77 \ 4 scan0001 | |
| Instruction to create a pattern and casting for a Petrol Pump Drive Bracket for experimental use. | 3rd Oct 1918 | Box 77 \ 4 scan0002 | |
| Notification regarding an experimental part not to be sent to the tool department. | 25th Oct 1918 | Box 77 \ 4 scan0003 | |
| Notification regarding the receipt of various bearings from The Hoffmann Manufacturing Co. for a Brigg's Petrol Pump. | 25th Oct 1918 | Box 77 \ 4 scan0004 | |
| Testing requirements for the Briggs Petrol Pump. | 2nd Jan 1919 | Box 77 \ 4 scan0005 | |
| Forwarding a copy of an R.A.E. report on a Briggs' Petrol Pump. | 4th Jan 1919 | Box 77 \ 4 scan0006 | |
| Letter from the Ministry of Munition of War enclosing an R.A.E. report on a Martin self-regulating petrol pump. | 6th Dec 1917 | Box 77 \ 4 scan0007 | |
| Royal Aircraft Establishment report on further endurance tests of the Martin Petrol Pump. | 19th Sep 1918 | Box 77 \ 4 scan0008 | |
| Tests and results for a pump's performance, including endurance, flow, and suction tests. | 19th Sep 1918 | Box 77 \ 4 scan0009 | |
| Analysis of pump performance including pressure fluctuations, carburetter feed, tilting, and hand operation. | 26th Apr 1917 | Box 77 \ 4 scan0010 | |
| Conclusions from a pump test, outlining performance after 100 hours and detailing advantages and disadvantages. | 26th Apr 1917 | Box 77 \ 4 scan0011 | |
| Cancellation notice for the Briggs' Petrol Pump. | 30th Mar 1920 | Box 77 \ 4 scan0012 | |
| Development of engine-driven petrol pumps for Eagle or Falcon engines. | 4th Jun 1920 | Box 77 \ 4 scan0013 | |
| Testing of a gasoline feeding device despite Mr. Royce's opinion on its lack of utility. | 27th Sep 1918 | Box 77 \ 4 scan0014 | |
| Gasoline feeding device invented by Mr. Twembley for automobiles and aeroplanes. | 17th May 1918 | Box 77 \ 4 scan0015 | |
| Technical discussion about the design and performance of a pump and valve system, claimed by Mr. Twambley as his invention. | 26th Apr 1917 | Box 77 \ 4 scan0016 | |
| Device for supplying gasoline to an engine, comparing different pump designs and proposing a trial. | 26th Apr 1917 | Box 77 \ 4 scan0017 | |
| Cancelling the experiment on a gasoline feeding device. | 30th Mar 1920 | Box 77 \ 4 scan0018 | |
| Proposal and diagram for a chassis fuel feed system using an engine-driven vacuum pump. | 26th Apr 1917 | Box 77 \ 4 scan0019 | |
| Vacuum feed system for gasoline and a potential new invention. | 4th Feb 1919 | Box 77 \ 4 scan0020 | |
| Advantages and potential issues of a vacuum feed system for petrol supply. | 24th Apr 1919 | Box 77 \ 4 scan0021 | |
| Page two of a document discussing improvements and trials of the Auto Vac system compared to the existing pressure system. | 24th Apr 1919 | Box 77 \ 4 scan0022 | |
| Letter regarding a customer complaint about a car's pressure system and the suggestion to fit a vacuum feed. | 3rd Sep 1919 | Box 77 \ 4 scan0023 | |
| Letter addressing customer dissatisfaction with a car's pressure system and discussing potential solutions. | 4th Sep 1919 | Box 77 \ 4 scan0024 | |
| Letter from the New York office regarding faults with pressure systems, spare parts supply issues from England, and design flaws in an experimental air pump. | 4th Sep 1919 | Box 77 \ 4 scan0025 | |
| Extract from a report on an American visit discussing issues with bonnet fittings, radiators, locks, battery boxes and vacuum feeds. | 11th Nov 1920 | Box 77 \ 4 scan0026 | |
| Tests carried out to show the limitations of the vacuum petrol supply system on a 40/50 chassis. | 22th Nov 1920 | Box 77 \ 4 scan0027 | |
| The limitations of vacuum petrol supply systems at full throttle. | 22th Nov 1920 | Box 77 \ 4 scan0028 | |
| Size and position of the vacuum tank on a 40/50 chassis, model 6.EX. | 15th Oct 1922 | Box 77 \ 4 scan0029 | |
| Petrol flow and consumption tests for a vacuum tank fitted on a 6-EX model, including horsepower data. | 15th Mar 1923 | Box 77 \ 4 scan0030 | |
| Mr. Royce's request to experimentally fit a vacuum pump to the petrol system. | 30th Jun 1923 | Box 77 \ 4 scan0031 | |
| Mr. Royce's thoughts on a vacuum reservoir and autovac system for the 40/50 model. | 4th Jul 1923 | Box 77 \ 4 scan0032 | |
| Modifications to the petrol tank, including the adoption of a vacuum feed system and luggage grid. | 27th Jun 1924 | Box 77 \ 4 scan0033 | |
| Letter from the US office to the UK office discussing fuel feed system heating and misfiring issues. | 22th Sep 1927 | Box 77 \ 4 scan0034 | |
| Improvements to the suction-pipe connection and a proposed new finish for the vacuum tank. | 22th Sep 1927 | Box 77 \ 4 scan0035 | |
| Letter from Maurice Olley regarding misfiring issues caused by the vacuum tank and the results of tests on different pipe arrangements. | 27th Sep 1927 | Box 77 \ 4 scan0036 | |
| Article from 'The Autocar' magazine describing the Wood-Milne foot pump. | 21th Sep 1912 | Box 77 \ 4 scan0037 | |
| Departmental memo regarding the trial and testing of a Wood Milne foot pump. | 6th Mar 1913 | Box 77 \ 4 scan0038 | |
| Requesting the testing of a foot pump received from Messrs Wood Milne Ltd for a month's trial. | 7th Mar 1913 | Box 77 \ 4 scan0039 | |
| Departmental memo requesting an opinion on the Woodmilne Foot Pump. | 13th Mar 1913 | Box 77 \ 4 scan0040 | |
| Experiment testing the 'Wood-Milne' foot tyre pump. | 1st Apr 1913 | Box 77 \ 4 scan0041 | |
| Recommendation of a garage pump, including the 'Wood-Milne' model and electric alternatives. | 8th Apr 1913 | Box 77 \ 4 scan0042 | |
| Departmental memo concerning the testing and experimentation of Wood-Milne and Electric tyre pumps. | 11th Apr 1913 | Box 77 \ 4 scan0043 | |
| Note regarding a Wood-Milne Foot Pump sent to Mr. Royce with Chassis 2301. | 22th Apr 1913 | Box 77 \ 4 scan0044 | |
| Seeking the Experimental Department's opinion on the Woodmilne Foot Pump. | 6th Nov 1913 | Box 77 \ 4 scan0045 | |
| Confirming a report on the Woodmilne Foot Pump, stating it is as good as the standard pump and that preference is a matter of opinion. | 8th Nov 1913 | Box 77 \ 4 scan0046 | |
| From Wor. to Mr. Hives requesting a new foot pump connection and a magneto for Mr. Royce. | 31th Jul 1917 | Box 77 \ 4 scan0047 | |
| Correspondence regarding the testing and rejection of the Hampden Pump in favour of an in-house designed mechanical air pump. | 25th Feb 1921 | Box 77 \ 4 scan0048 | |
| Comparing alternative foot pumps to the Dunlop pump. | 1st Dec 1925 | Box 77 \ 4 scan0049 | |
| Article from 'The Autocar' magazine detailing the function of a four-cylinder, engine-operated Kellogg tyre pump. | 21th Sep 1912 | Box 77 \ 4 scan0050 | |
| Proposed schemes for a chain drive from the camshaft to an air pump or revolution counter. | 23th Jun 1913 | Box 77 \ 4 scan0051 | |
| | | | |
