| Description | Date | Identifier | |
| Diagram of a modified shape for inlet bends in a cylinder head, with valve dimensions and areas. | 24th Aug 1933 | Box 31 \ 2 Scan111 | |
| Blueprint graph comparing the airflow of a standard head versus a large inlet valve head for the Phantom engine. | 29th Aug 1933 | Box 31 \ 2 Scan112 | |
| Cover sheet with an ink stamp from the Int Room in Derby. | 29th Aug 1933 | Box 31 \ 2 Scan113 | |
| Graph comparing the flow through a standard head and a large inlet valve head on a Phantom engine. | 29th Aug 1933 | Box 31 \ 2 Scan114 | |
| Graph comparing the flow rate versus pressure difference for a standard head and a large inlet valve head on a Phantom engine. | 29th Aug 1933 | Box 31 \ 2 Scan115 | |
| Graph comparing the effectiveness of opposite halves of an inlet valve in a large valve cylinder head at full lift. | 29th Aug 1933 | Box 31 \ 2 Scan116 | |
| Curve showing the variation of air flow with varying valve lift for a large valve (E.83906) cylinder head on a Phantom engine. | 29th Aug 1933 | Box 31 \ 2 Scan117 | |
| Graph comparing airflow through various Phantom II cylinder heads and an 8 Litre Bentley head. | 29th Aug 1933 | Box 31 \ 2 Scan118 | |
| Graph comparing flow through inlet ports no. 1 & 6 for a Standard Bentley Head. | 29th Aug 1933 | Box 31 \ 2 Scan119 | |
| Graph comparing airflow through a Standard Bentley Head inlet port with and without a guide vane. | 29th Aug 1933 | Box 31 \ 2 Scan120 | |
| Graph comparing flow through a standard Bentley head EB 222 versus a 30° inlet valve seat head. | 29th Aug 1933 | Box 31 \ 2 Scan121 | |
| Graph comparing air flow through four different types of experimental Bentley cylinder heads. | 29th Aug 1933 | Box 31 \ 2 Scan122 | |
| Graph comparing flow through E.83904 inlet valves, with and without regrinding lips, in an E.83906 head. | 29th Aug 1933 | Box 31 \ 2 Scan123 | |
| Graph of power curves comparing different inlet valve sizes for the Phantom engine. | 29th Aug 1933 | Box 31 \ 2 Scan124 | |
| Power curve graph comparing the performance of a standard head (EB 222) versus a head with large inlet valves (EB GIS) on a Bentley engine. | 29th Aug 1933 | Box 31 \ 2 Scan125 | |
| Performance curve chart comparing a standard and a long duration camshaft for a Phantom engine. | 29th Aug 1933 | Box 31 \ 2 Scan126 | |
| The reverse side of a document showing a purple ink stamp from the print room. | 29th Aug 1933 | Box 31 \ 2 Scan127 | |
| The receipt of Beryllium Bronze and the recommended heat treatment for manufacturing valve guides. | 8th Sep 1933 | Box 31 \ 2 Scan128 | |
| Addendum to a report on tests concerning the efficiency of valving for Phantom and Bentley engines. | 25th Sep 1933 | Box 31 \ 2 Scan129 | |
| Conclusions from tests on engine cylinder head components, including induction ports, combustion chambers and valves. | 25th Sep 1933 | Box 31 \ 2 Scan130 | |
| Summary of tests to improve volumetric efficiency by fitting two inlet valves per cylinder and shortening the induction port. | 25th Sep 1933 | Box 31 \ 2 Scan131 | |
| Two diagrams showing a sectional elevation and a horizontal cut of a rotating port mechanism. | 26th Sep 1938 | Box 31 \ 2 Scan132 | |
| Stamped cover or separator sheet from the print room. | 26th Sep 1938 | Box 31 \ 2 Scan133 | |
| Graph showing the effect of the inlet port angle on the flow through a valve port. | 26th Sep 1938 | Box 31 \ 2 Scan134 | |
| Graph comparing airflow versus pressure differential for different engine cylinder heads. | 26th Sep 1938 | Box 31 \ 2 Scan135 | |
| Graph comparing airflow through different engine cylinder heads against pressure difference across the valve. | 26th Sep 1938 | Box 31 \ 2 Scan136 | |
| Table of pressure readings recorded at various places in an induction port. | 26th Sep 1933 | Box 31 \ 2 Scan137 | |
| Reverse side of a document with a Print Room stamp. | 26th Sep 1933 | Box 31 \ 2 Scan138 | |
| Drawing LeC.3680, an improved experimental exhaust valve to be made in Austenetic steel. | 28th Oct 1933 | Box 31 \ 2 Scan139 | |
| Addition to a report on tests for the efficiency of valving of Phantom II & Bentley engines, comparing wooden models to machined castings. | 6th Dec 1933 | Box 31 \ 2 Scan140 | |
| Summary of conclusions from tests on engine port streamlining and inlet valve modifications on a Bentley engine. | 6th Dec 1933 | Box 31 \ 2 Scan141 | |
| Graph comparing the air-flow of various Bentley cylinder heads. | 6th Dec 1933 | Box 31 \ 2 Scan142 | |
| Newspaper clipping from 'The Autocar' describing an auxiliary petrol tank device for easy engine starting. | 3rd Aug 1912 | Box 31 \ 3 Scan001 | |
| Modifications for cars operating in cold weather conditions at the front. | 5th Nov 1914 | Box 31 \ 3 Scan002 | |
| Radiator cooling options, including fan modifications and using oil to prevent freezing. | 6th Nov 1914 | Box 31 \ 3 Scan003 | |
| Cold weather engine starting issues, proposing a pilot jet for new chassis and other remedies for existing cars. | 6th Nov 1914 | Box 31 \ 3 Scan004 | |
| Procedure for cleaning sticky oil from exhaust valves and its inclusion in the Instruction Book. | 30th Dec 1914 | Box 31 \ 3 Scan005 | |
| Proposed petrol syringe system to facilitate easier engine starting. | 30th Dec 1914 | Box 31 \ 3 Scan006 | |
| Alternative starting procedure using a three-way cock and pressure pump. | 30th Dec 1914 | Box 31 \ 3 Scan007 | |
| Continuation page of instructions for operating air and petrol cocks. | 30th Dec 1914 | Box 31 \ 3 Scan008 | |
| Proposal for an 'Easy Starting' system using a standard hand pump to deliver a fine spray of petrol into the induction pipe. | 6th Jan 1915 | Box 31 \ 3 Scan009 | |
| Description of a petrol hand pump system and its advantages over other arrangements. | 6th Jan 1915 | Box 31 \ 3 Scan010 | |
| Fuel delivery systems and cold weather starting procedures for a 6-cylinder engine. | 8th Dec 1914 | Box 31 \ 3 Scan011 | |
| Hand-drawn diagram illustrating a vehicle's fuel delivery and priming system. | 8th Dec 1914 | Box 31 \ 3 Scan012 | |
| And comparing two arrangements for improving engine starting, one from Mr. Hives and another from Mr. Elliott. | 8th Jan 1915 | Box 31 \ 3 Scan013 | |
| Various arrangements for a fuel and air induction system for motor car and aero engines. | 8th Dec 1914 | Box 31 \ 3 Scan014 | |
| Carburettor pilot jet arrangements for starting aero engines, comparing Sthenos, Claudel Hobson, and Mercedes models. | 8th Dec 1914 | Box 31 \ 3 Scan015 | |
| Modification to the priming arrangement for easier engine starting. | 12th Jan 1915 | Box 31 \ 3 Scan016 | |
| Proposed arrangement for injecting a fine petrol spray into the induction pipe for engine starting. | 12th Nov 1915 | Box 31 \ 3 Scan017 | |
| Priming arrangement for easy engine starting. | 13th Jan 1915 | Box 31 \ 3 Scan018 | |
| Technical note discussing engine priming, induction pipe capacity and hand pump operation for starting. | 13th Jan 1915 | Box 31 \ 3 Scan019 | |
| The testing of a portable priming arrangement for starting car engines and suggestions for design improvements. | 14th Jan 1915 | Box 31 \ 3 Scan020 | |
| To the Shipping Department requesting a Priming Device be sent to Mr Royce. | 14th Jan 1915 | Box 31 \ 3 Scan021 | |
| New reed valve design for improving engine starting and the need to protect the design. | 15th Jan 1915 | Box 31 \ 3 Scan022 | |
| Letter discussing design improvements for syringes used for spraying petrol into an induction pipe. | 20th Jan 1915 | Box 31 \ 3 Scan023 | |
| Instructions for operating a priming device fitted to vehicle 7CA. | 27th Jan 1915 | Box 31 \ 3 Scan024 | |
| Issues with the priming and easy starting devices on car 7CA, comparing performance with car 58NA. | 6th Feb 1915 | Box 31 \ 3 Scan025 | |
| From 'R' to 'Wor.' for 'E.H.' discussing three potential modifications to a low-speed jet. | 15th Feb 1915 | Box 31 \ 3 Scan026 | |
| Experiments on 'Easy Starting Devices' involving modifications to a standard hand pump. | 15th Feb 1915 | Box 31 \ 3 Scan027 | |
| Experiments with a petrol priming system for engine starting, discussing pressure, reservoir capacity, and spray nozzles. | 15th Feb 1915 | Box 31 \ 3 Scan028 | |
| The design and function of a U-tube valve for engine priming and petrol delivery. | 15th Feb 1915 | Box 31 \ 3 Scan029 | |
| The problems with starting aero engines and the potential for a simple, light self-starter. | 15th Feb 1915 | Box 31 \ 3 Scan030 | |
| Diagram illustrating a priming arrangement for a fuel system. | 24th Feb 1915 | Box 31 \ 3 Scan031 | |
| Development and issues with an experimental priming device for easy starting. | 24th Feb 1915 | Box 31 \ 3 Scan032 | |
| Various devices for engine priming and enriching the fuel-air mixture. | 24th Feb 1915 | Box 31 \ 3 Scan033 | |
| Enriching scheme adopted for easier engine starting. | 24th Feb 1915 | Box 31 \ 3 Scan034 | |
| Internal memorandum detailing instructions from Mr. Royce for easy engine starting and seeking approval for a customer pamphlet. | 8th Mar 1915 | Box 31 \ 3 Scan035 | |
| The procedure for warming up an engine to ensure easy starting. | 9th Mar 1915 | Box 31 \ 3 Scan036 | |
| Implementation of a priming device, its pattern, and associated components. | 20th May 1919 | Box 31 \ 3 Scan037 | |
| Car 58NA, requesting a complete scheme for an instrument board hand pump. | 26th May 1915 | Box 31 \ 3 Scan038 | |
| Filing instruction slip referencing a report on a Priming Device. | 4th Jun 1915 | Box 31 \ 3 Scan039 | |
| The design and fitting instructions for a new spraying device. | 22th Jul 1915 | Box 31 \ 3 Scan040 | |
| From 'R' about expediting the production of 100 sets from temporary patterns for cars sent to the front. | 23th May 1919 | Box 31 \ 3 Scan041 | |
| Letter to Dr. Percy Duncan describing the features and benefits of an Auxiliary Water Carburettor. | 23th May 1919 | Box 31 \ 3 Scan042 | |
| Letter regarding the benefits and trial fitting of a water carburettor. | 16th Jul 1919 | Box 31 \ 3 Scan043 | |
| Sales letter from Rich & Bundy introducing their 'HOT-SPOT' electric vaporiser for engines. | 16th Jul 1919 | Box 31 \ 3 Scan044 | |
| Letter from RICH & BUNDY regarding a new electrical device offered in various voltages for inspection and trial. | 10th Nov 1919 | Box 31 \ 3 Scan045 | |
| Engine starting procedures, primer usage, and cold weather performance. | 10th Nov 1919 | Box 31 \ 3 Scan046 | |
| Cause of spark plug sooting being new engine starting arrangements and the self-starter. | 6th Nov 1919 | Box 31 \ 3 Scan047 | |
| Sales letter from The General Electric Co. Ltd. promoting the 'Kramer - Vaporiser' for solving cold-starting problems in engines. | 12th Dec 1919 | Box 31 \ 3 Scan048 | |
| Sales brochure for the 'Kramer-Vaporiser', a device for the rapid starting of petrol engines. | 1st Oct 1919 | Box 31 \ 3 Scan049 | |
| Instructional leaflet for the Kramer-Vaporiser, a device for starting petrol engines. | 14th Dec 1920 | Box 31 \ 3 Scan050 | |
| Comparison of amperes taken to turn a 40/50 engine using Prices' 'C' Oil and Castrol Oil. | 14th Dec 1920 | Box 31 \ 3 Scan051 | |
| Comparison of motor starter tests using Prices 'C' Oil and Castrol Oil. | 15th Dec 1920 | Box 31 \ 3 Scan052 | |
| Proposal by Mr. Royce to experiment with a hot spot induction system using exhaust heat to create a fuel 'fog' for improved cylinder distribution. | 15th Dec 1920 | Box 31 \ 3 Scan053 | |
| Relaying Mr. Royce's suggestions for experiments on reheating the carburetion system for the 40/50 HP chassis. | 21th Dec 1920 | Box 31 \ 3 Scan054 | |
| Internal memorandum discussing modifications to the induction system to suit available petrol and improve engine running in winter. | 24th Jan 1921 | Box 31 \ 3 Scan055 | |
| Proposed modifications to the 40/50 HP chassis throttle to create a 'hot spot'. | 1st Jul 1921 | Box 31 \ 3 Scan056 | |
| Modifications to a carburettor for handling fuel mixtures and cold weather starting. | 10th Oct 1921 | Box 31 \ 3 Scan057 | |
| Defective starting devices and proposed improvements to carburetters. | 10th Oct 1921 | Box 31 \ 3 Scan058 | |
| Modifications to a carburetter and induction system, including mixture strength and fitting a silencer. | 10th Oct 1921 | Box 31 \ 3 Scan059 | |
| Cablegram to Mr. Hives regarding the testing of a pilot jet and vaporising scheme. | 27th Oct 1921 | Box 31 \ 3 Scan060 | |
| Cablegram discussing the successful testing of modified vaporiser pipes and pilot jets for cold starting. | 27th Oct 1921 | Box 31 \ 3 Scan061 | |
| History of the development of a cold start system for cars in America. | 9th Nov 1921 | Box 31 \ 3 Scan062 | |
| The challenges of adapting car designs for the American market and the need for more autonomy at the Springfield factory. | 9th Nov 1921 | Box 31 \ 3 Scan063 | |
| Cable from Springfield regarding tests on a pilot jet to solve cold starting issues in the U.S.A. | 5th Nov 1921 | Box 31 \ 3 Scan064 | |
| 'Winter Starting in America', attaching a previously omitted document. | 15th Nov 1921 | Box 31 \ 3 Scan065 | |
| Induction pipe changes and cold weather starting issues. | 1st Nov 1921 | Box 31 \ 3 Scan066 | |
| Report comparing the effectiveness of an exhaust heated throttle against a vaporiser scheme for engine induction. | 1st Nov 1921 | Box 31 \ 3 Scan067 | |
| Comparing an exhaust heated throttle with a vaporiser scheme for cold weather performance and making recommendations for American cars. | 1st Nov 1921 | Box 31 \ 3 Scan068 | |
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