| Description | Date | Identifier | |
| Function of a vaporizer scheme and methods for measuring crankcase dilution. | 21th Dec 1921 | Box 75 \ 2 scan0274 | |
| Inter-office letter discussing the performance of induction pipes with and without collector rings, focusing on cold starting issues. | 21th Dec 1921 | Box 75 \ 2 scan0275 | |
| Potential engine design modifications, particularly regarding carburetters, generators, and magnetos. | 19th Dec 1921 | Box 75 \ 2 scan0276 | |
| Drawing of a Magneto Coupling of the Merchant and Evans Fixed Type. | 19th Dec 1921 | Box 75 \ 2 scan0277 | |
| Inter-office correspondence regarding induction pipes and a new device called the Penberthy Reatomizer. | 2nd Feb 1922 | Box 75 \ 2 scan0278 | |
| Improving fuel distribution in induction systems by fitting a 'Reatomizer' to correct throttle and pipe issues. | 2nd Feb 1922 | Box 75 \ 2 scan0279 | |
| Engineering committee report discussing the vaporiser scheme, pilot jet, and radiator shutters for winter conditions. | 2nd Feb 1922 | Box 75 \ 2 scan0280 | |
| The function and effects of Reatomizers versus vaporizer pipes in engines, particularly regarding fuel management and cold starts. | 2nd Feb 1922 | Box 75 \ 2 scan0281 | |
| Letter discussing an upcoming visit in relation to the weather and recent car performance. | 1st Feb 1922 | Box 75 \ 2 scan0282 | |
| Graph comparing Miles Per Gallon (M.P.G.) against Miles Per Hour (M.P.H.) for an Overland 4 Coupe. | 1st Feb 1922 | Box 75 \ 2 scan0283 | |
| Cross-section drawing of a throttle body with notes on a machining fault causing power loss. | 2nd Feb 1922 | Box 75 \ 2 scan0284 | |
| Suggesting the fitment of a priming tap on the induction pipe of the 40/50 chassis to aid starting. | 2nd Feb 1922 | Box 75 \ 2 scan0285 | |
| Inter-office letter discussing carburation, manifold design, and hot air intake performance. | 9th Jun 1922 | Box 75 \ 2 scan0286 | |
| The fitting of a new induction pipe arrangement on a 40/50 HP test engine. | 6th Jul 1922 | Box 75 \ 2 scan0287 | |
| Bench tests of new 40/50 induction and exhaust pipes, detailing poor performance and distribution results. | 1st Jul 1922 | Box 75 \ 2 scan0288 | |
| The optimal placement of the carburettor to mitigate fire risk, referencing the 40/50, Goshawk I, and Hawk Northcliffe engines. | 16th Oct 1922 | Box 75 \ 2 scan0289 | |
| Faulty carburation in cold weather on the 40/50 Chassis and the proposal to introduce new induction pipes. | 16th Oct 1922 | Box 75 \ 2 scan0290 | |
| Instruction sheet detailing carburettor tests and power curve results for an engine. | 28th Oct 1922 | Box 75 \ 2 scan0291 | |
| Test results for a new induction pipe, showing fuel mixture strength across cylinders at various engine speeds. | 28th Oct 1922 | Box 75 \ 2 scan0292 | |
| Engine test bed instructions and results for a Copt induction pipe with the carburetter on the exhaust side. | 12th Jan 1923 | Box 75 \ 2 scan0293 | |
| Engine test bed results for distribution on a cast induction pipe with a carburetter on the Cox side. | 13th Jan 1923 | Box 75 \ 2 scan0294 | |
| Instructions and test results for an engine induction pipe distribution test. | 16th Jan 1923 | Box 75 \ 2 scan0295 | |
| Successful development of an induction pipe and proposing further experiments on a Marmon engine. | 1st Feb 1923 | Box 75 \ 2 scan0296 | |
| Analysis of fuel mixture distribution in a first experimental induction pipe. | 16th Feb 1923 | Box 75 \ 2 scan0297 | |
| Analysis of the causes for unequal fuel distribution in six-cylinder engines. | 16th Feb 1923 | Box 75 \ 2 scan0298 | |
| Continued page discussing fuel supply proportionality and distribution issues in a Marmon pipe. | 26th Feb 1921 | Box 75 \ 2 scan0299 | |
| Experimental power and jet consumption data for an S.U. carburetter with pipe (1). | 26th Feb 1921 | Box 75 \ 2 scan0300 | |
| List comparing induction pipe depressions for the E.A.C. and 40/50 HP engines at various speeds. | 5th May 1925 | Box 75 \ 2 scan0301 | |
| Note about the Autovac connection on the induction pipe affecting slow running and promising a forthcoming solution. | 27th May 1925 | Box 75 \ 2 scan0302 | |
| Acknowledging a customer complaint for Chassis No. 41-TM, stating the issue is under review. | 29th Jun 1925 | Box 75 \ 2 scan0303 | |
| Requesting the alteration of an induction pipe pattern and its despatch for the production of electron castings. | 21th Jun 1929 | Box 75 \ 2 scan0304 | |
| Extract concerning the American Model, specifically the transfer of induction, exhaust, silencer, and priming pipes. | 27th Sep 1919 | Box 75 \ 2 scan0305 | |
| The decision to continue right-hand drive chassis production for the American market and halt left-hand drive development. | 31th Oct 1919 | Box 75 \ 2 scan0306 | |
| Internal memorandum discussing the jacketing of induction pipes for chassis destined for America. | 17th Feb 1921 | Box 75 \ 2 scan0307 | |
| Typed memo discussing the stoppage of March deliveries as a poorly considered scheme to solve an issue. | 10th Dec 1920 | Box 75 \ 2 scan0308 | |
| Letter discussing a vaporizer scheme, fuel quality, and engine operation. | 12th Sep 1921 | Box 75 \ 2 scan0309 | |
| Report discussing fuel vaporization methods, including hot spots, vaporizers, and weirs for engine carburetters. | 9th Sep 1921 | Box 75 \ 2 scan0310 | |
| Request for findings on a vaporizer test, both without the hot throttle and using hot water circulation. | 12th Sep 1921 | Box 75 \ 2 scan0311 | |
| Induction pipe changes in response to cold starting issues in America. | 1st Nov 1921 | Box 75 \ 2 scan0312 | |
| Report comparing the effectiveness of a vaporiser scheme versus an exhaust heated throttle to improve engine performance. | 1st Nov 1921 | Box 75 \ 2 scan0313 | |
| Test results for power absorbed by a fan on a dynamometer. | 27th May 1909 | Box 75 \ 3 scan0001 | |
| Bench experiments on a 40/50 standard six-bladed radiator fan and the same fan with three blades removed. | 18th Sep 1924 | Box 75 \ 3 scan0002 | |
| Fan power speed curves, noting issues with belt slippage at high motor speeds. | 18th Sep 1924 | Box 75 \ 3 scan0003 | |
| Power tests for fan belts, detailing motor speeds, pulley ratios, and power-speed laws for six-blade and three-blade fans. | 18th Sep 1924 | Box 75 \ 3 scan0004 | |
| Report page detailing the power required to drive fans, the effect of belt slippage, and the measurement of air stream velocity. | 18th Sep 1924 | Box 75 \ 3 scan0005 | |
| Experimental setup to measure fan thrust using a spring balance and a revolving turntable. | 18th Sep 1924 | Box 75 \ 3 scan0006 | |
| Graph comparing the air stream velocity of a three-bladed vs. a six-bladed 40/50 standard fan at various speeds. | 18th Sep 1924 | Box 75 \ 3 scan0007 | |
| Graph showing the power absorbed by a 40/50 standard fan at various speeds, comparing six and three-bladed fans. | 18th Sep 1924 | Box 75 \ 3 scan0008 | |
| Report from Dr. Watts of Ogilvie & Partners regarding a new fan design for the 40/50 HP chassis. | 19th Sep 1924 | Box 75 \ 3 scan0009 | |
| Letter from Ogilvie & Partners providing recommendations for improving the fan design on the 40-50 HP chassis. | 19th Sep 1924 | Box 75 \ 3 scan0010 | |
| Letter discussing fan blade design, focusing on blade twist, torque coefficients, and material suggestions. | 19th Sep 1924 | Box 75 \ 3 scan0011 | |
| Blueprint detailing the design, angles, and cross-section of a blade. | 29th Oct 1924 | Box 75 \ 3 scan0012 | |
| From EFC to RHC on the subject of fan tests, detailing completed and remaining work on various fan models. | 29th Oct 1924 | Box 75 \ 3 scan0013 | |
| Bench experiments measuring the thrust of various radiator fans at different speeds. | 19th Nov 1924 | Box 75 \ 3 scan0014 | |
| Continued report on fan testing, discussing available fans, methodology, and the relationship between fan thrust and cooling efficiency. | 19th Nov 1924 | Box 75 \ 3 scan0015 | |
| The methodology for comparing the efficiencies of various radiator fans by combining performance curves. | 19th Nov 1924 | Box 75 \ 3 scan0016 | |
| Technical analysis comparing the power requirements and efficiency of six-bladed versus three-bladed fans. | 19th Nov 1924 | Box 75 \ 3 scan0017 | |
| Fan technical efficiency and thrust, referencing experimental work and power curves. | 19th Nov 1924 | Box 75 \ 3 scan0018 | |
| Additional notes comparing the performance of six-bladed and three-bladed fans. | 20th Nov 1924 | Box 75 \ 3 scan0019 | |
| Comparison of the performance of six-blader and three-blader engine fans. | 20th Nov 1924 | Box 75 \ 3 scan0020 | |
| Graph of thrust-fan speed curves for various fans, Set B. | 20th Nov 1924 | Box 75 \ 3 scan0021 | |
| Graph of HP vs Fan Speed curves for a standard 6-blade fan and the same fan with 3 blades removed. | 20th Nov 1924 | Box 75 \ 3 scan0022 | |
| Graph showing power absorbed versus thrust for a standard 6-bladed fan compared to the same fan with 3 blades removed. | 20th Nov 1924 | Box 75 \ 3 scan0023 | |
| Further bench experiments on radiator fans, detailing a rearranged testing apparatus. | 17th Dec 1924 | Box 75 \ 3 scan0024 | |
| Report page analyzing the results from fan tests by comparing performance curves for power, thrust, and speed. | 17th Dec 1924 | Box 75 \ 3 scan0025 | |
| The testing of a four-bladed fan, noting improved efficiency and noise levels, with plans for further modifications. | 17th Dec 1924 | Box 75 \ 3 scan0026 | |
| List of various fans tested, along with their fan tip diameters and handwritten notes. | 16th Dec 1924 | Box 75 \ 3 scan0027 | |
| Performance comparison graph for various fan designs, plotting speed and power against axial thrust. | 27th Feb 1922 | Box 75 \ 3 scan0028 | |
| Graph comparing the thrust and slip performance of twelve different fan designs against engine speed. | 18th Dec 1924 | Box 75 \ 3 scan0029 | |
| Graph comparing the speed and power consumption of various engine fan designs. | 19th Dec 1924 | Box 75 \ 3 scan0030 | |
| Table of ratios for fan speeds corresponding to various thrusts of different fan types. | 19th Dec 1924 | Box 75 \ 3 scan0031 | |
| Data table showing fan speeds corresponding to various thrusts for different types of fans. | 19th Dec 1924 | Box 75 \ 3 scan0032 | |
| Confirming plans for fan tests, involving modifications to an EAC fan and the creation of an experimental Goshawk fan. | 19th Dec 1924 | Box 75 \ 3 scan0033 | |
| Engine cooling issues, comparing fans, and the benefits of louvred bonnets over shuttered ones. | 31th Dec 1924 | Box 75 \ 3 scan0034 | |
| Customer complaints about water boiling and the testing of an improved fan design as a remedy. | 21th Jan 1925 | Box 75 \ 3 scan0035 | |
| List of Goshawk size fans tested, detailing their descriptions and fan tip diameters. | 21th Jan 1925 | Box 75 \ 3 scan0036 | |
| Final investigations into the efficiency and shape of 20 HP fans, and a request for an EAC fan. | 4th Feb 1925 | Box 75 \ 3 scan0037 | |
| Comparison of the blade particulars and dimensions for a Goshawk No. 27 fan and a Hispano fan. | 5th Feb 1925 | Box 75 \ 3 scan0038 | |
| Calculation sheet detailing the fan speed of the Goshawk engine at a specific road speed. | 5th Feb 1925 | Box 75 \ 3 scan0039 | |
| Bench experiments conducted on 20 HP radiator fans. | 9th Feb 1925 | Box 75 \ 3 scan0040 | |
| Methodology and results of testing various fan designs and configurations. | 1st Feb 1925 | Box 75 \ 3 scan0041 | |
| Fan experiments, comparing the performance and design of fans No. 26 and No. 27. | 1st Feb 1925 | Box 75 \ 3 scan0042 | |
| Engine cooling fan efficiency, speed, drive belt ratios and wear. | 9th Feb 1925 | Box 75 \ 3 scan0043 | |
| Technical analysis comparing fan speed ratios, cooling effects, and power requirements between a standard and an experimental fan. | 9th Feb 1925 | Box 75 \ 3 scan0044 | |
| Performance comparison of fans driven with the same speed ratio. | 3rd Feb 1925 | Box 75 \ 3 scan0045 | |
| Graph comparing the performance of various Hispano and Goshawk engine fans, plotting speed and power against axial thrust. | 3rd Feb 1925 | Box 75 \ 3 scan0046 | |
| Graph comparing the power and thrust performance of three different aircraft engine fans against fan speed. | 9th Feb 1925 | Box 75 \ 3 scan0047 | |
| Table comparing fan speeds corresponding to various thrusts for different 20 HP fan designs. | 6th Feb 1925 | Box 75 \ 3 scan0048 | |
| Table of fan speeds corresponding to various thrusts for different 20 HP fans. | 6th Feb 1925 | Box 75 \ 3 scan0049 | |
| From EFC to RHC requesting an experimental fan, a modified starter motor, and a metal tube for experiments. | 16th Feb 1925 | Box 75 \ 3 scan0050 | |
| Road tests comparing the cooling efficiency of two different fan types (R.R. vs EFC). | 2nd Feb 1925 | Box 75 \ 3 scan0051 | |
| Comparison of cooling fan efficiency and suggestions for further road testing. | 24th Feb 1925 | Box 75 \ 3 scan0052 | |
| List of Goshawk size fans tested, detailing modifications and tip diameters. | 24th Feb 1925 | Box 75 \ 3 scan0053 | |
| Comparative test results of two engine fans, discussing differences in thrust and power consumption. | 24th Feb 1925 | Box 75 \ 3 scan0054 | |
| Numerical comparison of thrusts and power requirements for different fans at various speeds. | 17th Dec 1924 | Box 75 \ 3 scan0055 | |
| Report comparing the performance, cooling effect, and power consumption of a standard versus an experimental 20 HP fan. | 19th Feb 1925 | Box 75 \ 3 scan0056 | |
| Comparative cooling effects and power consumption of different fan designs, along with fan diameter constraints for a new chassis. | 27th Feb 1925 | Box 75 \ 3 scan0057 | |
| Fitting two tested 20 HP fans to a chassis. | 27th Feb 1925 | Box 75 \ 3 scan0058 | |
| The return of Fan Blades for a 20HP Chassis and the issue of corresponding drawings. | 27th Feb 1925 | Box 75 \ 3 scan0059 | |
| Graph plotting Fan Speed and Power Required against the Axial Thrust for a standard (3A) and an experimental (10A) fan type. | 19th Mar 1925 | Box 75 \ 3 scan0060 | |
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