| Description | Date | Identifier | |
| Letter from W.H. Reynolds concerning experiments with fixing tungsten rivets into blades and issues with the material splitting. | 13th Jul 1928 | Box 35 \ 6 scan 430 | |
| Quality of tungsten points from Messrs. Reynolds. | 17th Jul 1928 | Box 35 \ 6 scan 431 | |
| Comparing the make-ratio speed curve of a new battery ignition contact breaker against an older model and competitor products. | 14th Mar 1928 | Box 35 \ 6 scan 432 | |
| Graph of the make ratio versus speed curve for a new standard contact breaker. | 27th Jul 1928 | Box 35 \ 6 scan 433 | |
| Stamped document from the Print Room in Derby. | 14th Aug 1928 | Box 35 \ 6 scan 434 | |
| Improving the ignition distributor contact finger for 40/50 and 20 HP chassis. | 5th Aug 1928 | Box 35 \ 6 scan 435 | |
| Successful modifications to the new contact maker LeC. 2460. | 20th Aug 1928 | Box 35 \ 6 scan 436 | |
| Cross-reference note regarding further information on Tungsten contact points. | 31th Dec 1930 | Box 35 \ 6 scan 437 | |
| Article from 'The Autocar' magazine discussing and measuring air leakage in petrol engines. | 8th May 1915 | Box 36 \ 1 scan 001 | |
| Page from an automotive journal featuring articles on engine air leakage and leaf spring characteristics. | 8th May 1915 | Box 36 \ 1 scan 002 | |
| Development of R.R.C.H. carburetters and their advantages over the B.Z.S. type. | 24th Jan 1917 | Box 36 \ 1 scan 003 | |
| Stating the reasons for abandoning the use of suction control on a carburetter. | 1st Jan 1917 | Box 36 \ 1 scan 004 | |
| Drawing for two types of variable jets for an R.R.C.H. carburetter. | 1st Jan 1917 | Box 36 \ 1 scan 005 | |
| Requesting experiments to determine a basis for comparing fluid flow through orifices and pipes of different cross-sections. | 1st Jan 1917 | Box 36 \ 1 scan 006 | |
| Page two of a letter from E. to EFC proposing a general experimental investigation into fluids following mixture strength tests. | 1st Jan 1917 | Box 36 \ 1 scan 007 | |
| Outlining experiments on the flow of fluids through orifices and pipes of different forms. | 3rd Feb 1917 | Box 36 \ 1 scan 008 | |
| Proposing experiments on the flow of fluids through pipes and valves for engine induction systems. | 23th Jun 1917 | Box 36 \ 1 scan 009 | |
| Plan and methodology for experiments on the flow of liquids through various orifices and pipes. | 9th Feb 1917 | Box 36 \ 1 scan 010 | |
| Prioritisation of experiments relating to Aero Engine Oil Pump performance. | 16th Feb 1916 | Box 36 \ 1 scan 011 | |
| Experiment regarding the flow of liquids through orifices and the formulas for calculation. | 18th Feb 1916 | Box 36 \ 1 scan 012 | |
| The basis of comparison for orifices and the equations for the flow of liquids. | 21th Feb 1917 | Box 36 \ 1 scan 013 | |
| Page discussing the coefficients of velocity and contraction for fluid flow through orifices, including Borda's mouthpiece. | 15th Feb 1916 | Box 36 \ 1 scan 014 | |
| Page from a document discussing the coefficient of contraction and discharge for fluid flow through various orifices. | 16th Feb 1916 | Box 36 \ 1 scan 015 | |
| Page describing the calculation for the velocity of efflux, taking into account the velocity of approach. | 18th May 1936 | Box 36 \ 1 scan 016 | |
| Page detailing the equations for calculating the flow of liquids through pipes. | 18th May 1936 | Box 36 \ 1 scan 017 | |
| Page of fluid dynamics calculations for flow in circular pipes, including Darcy's formulas. | 16th Feb 1916 | Box 36 \ 1 scan 018 | |
| The equations for the flow of gases through an orifice. | 18th Feb 1916 | Box 36 \ 1 scan 019 | |
| Page discussing the principles of gas flow through an orifice and limiting pressure ratios. | 1st Feb 1919 | Box 36 \ 1 scan 020 | |
| Page discussing the principles of gas flow through an ideal expanding nozzle and a sharp orifice. | 1st Feb 1919 | Box 36 \ 1 scan 021 | |
| Page from a document discussing fluid dynamics, pressure in nozzles, and the calculation of mass discharge. | 1st Feb 1919 | Box 36 \ 1 scan 022 | |
| Page detailing formulas for calculating the flow of compressible and non-compressible fluids through orifices. | 1st Feb 1919 | Box 36 \ 1 scan 023 | |
| Page detailing an approximate form of an equation for specific values related to air. | 21th Feb 1917 | Box 36 \ 1 scan 024 | |
| Mathematical rules for the flow of liquids through pipes, orifices and jets. | 21th Feb 1917 | Box 36 \ 1 scan 025 | |
| Form of entrance to a cylindrical orifice and attaching notes on the flow of liquids. | 21th Feb 1917 | Box 36 \ 1 scan 026 | |
| The location of a book on fluid mechanics, with a handwritten reply confirming possession. | 29th Mar 1917 | Box 36 \ 1 scan 027 | |
| Proposing experiments on the flow of petrol through a set of 9 orifices with varying lengths and bore sizes. | 31th Mar 1917 | Box 36 \ 1 scan 028 | |
| Proposal for experiments on fluid discharge through various orifices to measure flow variation with length and cross-sectional area. | 31th Mar 1917 | Box 36 \ 1 scan 029 | |
| The concluding page of a document discussing results to inform future jet designs. | 30th Mar 1917 | Box 36 \ 1 scan 030 | |
| Experimental orifice bore sizes and length ratios for tests on the flow of liquids. | 1st Apr 1917 | Box 36 \ 1 scan 031 | |
| Request for the manufacture of a set of 16 experimental gun-metal nozzles with varying dimensions for petrol flow experiments. | 17th Apr 1917 | Box 36 \ 1 scan 032 | |
| Specification table for different nozzle dimensions, including bore and length. | 15th Feb 1916 | Box 36 \ 1 scan 033 | |
| Table of lengths and bores for nozzles, relating to the flow of liquids through orifices. | 18th Mar 1916 | Box 36 \ 1 scan 034 | |
| Request for the manufacture of specified nozzles for a liquid flow experiment. | 4th May 1917 | Box 36 \ 1 scan 035 | |
| Request to examine the bores of 16 nozzles and report on how they agree with an accompanying table. | 7th May 1917 | Box 36 \ 1 scan 036 | |
| Confirmation note for passing a Control Bracket and Nozzles for testing. | 7th May 1917 | Box 36 \ 1 scan 037 | |
| Table of nozzle dimensions concerning the flow of liquids through them, with an accompanying diagram. | 10th Feb 1916 | Box 36 \ 1 scan 038 | |
| Test results table for the flow of liquids through various nozzles, detailing the state and appearance of the bore. | 15th Feb 1916 | Box 36 \ 1 scan 039 | |
| Data sheet recording the flow of water through various nozzles under different pressure heads. | 16th Feb 1915 | Box 36 \ 1 scan 040 | |
| Data sheet showing petrol discharge in c.c./min for various nozzles at different head pressures. | 18th Feb 1910 | Box 36 \ 1 scan 041 | |
| Data table showing the discharge of petrol in cc/min for various horizontal nozzles and heads. | 15th Feb 1916 | Box 36 \ 1 scan 042 | |
| Data table showing times to discharge 500cc of water through different nozzles under three pressure heads. | 16th Feb 1916 | Box 36 \ 1 scan 043 | |
| Table showing the discharge times in seconds for various nozzles dispensing 500cc of petrol under three different head pressures. | 15th Feb 1916 | Box 36 \ 1 scan 044 | |
| Data table showing the discharge times for various nozzles using liquid petrol under different head pressures. | 15th Feb 1916 | Box 36 \ 1 scan 045 | |
| The flow of liquids through nozzles. | 23th May 1917 | Box 36 \ 1 scan 046 | |
| Experiments on the flow of liquids through cylindrically shaped nozzles of various bores and lengths. | 23th May 1917 | Box 36 \ 1 scan 047 | |
| Page 2 of a report detailing nozzle discharge trials with petrol, including a data table and summary of findings. | 23th May 1917 | Box 36 \ 1 scan 048 | |
| Analysis of discharge coefficients for nozzles, considering factors like bore size, length ratio, and skin friction. | 23th May 1917 | Box 36 \ 1 scan 049 | |
| Calculation sheet for the ideal discharge of nozzles. | 23th May 1917 | Box 36 \ 1 scan 050 | |
| Data table comparing ideal and actual values for flow rates measured in c.c. per minute. | 23th May 1917 | Box 36 \ 1 scan 051 | |
| Table of data showing water vertical coefficients of discharge for various nozzles under different head pressures. | 15th May 1916 | Box 36 \ 1 scan 052 | |
| Table of discharge coefficients for vertical petrol nozzles under three different head pressures. | 15th May 1916 | Box 36 \ 1 scan 053 | |
| Table showing coefficients of discharge for different petrol horizontal nozzles under three different head pressures. | 20th Oct 1917 | Box 36 \ 1 scan 054 | |
| Experimental results of the flow of petrol through various nozzles. | 20th Oct 1917 | Box 36 \ 1 scan 055 | |
| Experiments on the flow of petrol through various nozzles. | 9th May 1917 | Box 36 \ 1 scan 056 | |
| Table of nozzle dimensions and their corresponding length-to-bore ratios for calculating the flow of liquids. | 9th May 1917 | Box 36 \ 1 scan 057 | |
| Data table detailing the discharge rates of various nozzles under different head pressures. | 1st Feb 1933 | Box 36 \ 1 scan 058 | |
| Data table showing coefficients of discharge for Head 1, cross-referencing bore length with bore diameter. | 9th Jan 1917 | Box 36 \ 1 scan 059 | |
| Data table showing coefficients of discharge for varying bore lengths and diameters. | 9th Jan 1917 | Box 36 \ 1 scan 060 | |
| Table of coefficients of discharge for head 3, detailing various bore lengths and diameters. | 9th Feb 1917 | Box 36 \ 1 scan 061 | |
| Table of average coefficients of discharge for various bore lengths and diameters. | 9th Feb 1917 | Box 36 \ 1 scan 062 | |
| Cover note attaching copies of correspondence between Mr. Lappin and the company regarding various carburetters. | 11th Jun 1920 | Box 36 \ 1 scan 063 | |
| Carburetter tests conducted at R.A.E. to determine the minimum and maximum heads before flooding starts. | 2nd Jun 1920 | Box 36 \ 1 scan 064 | |
| To Mr. Lappin regarding the float feed control range and petrol flow for various carburetters. | 5th Jun 1920 | Box 36 \ 1 scan 065 | |
| Petrol flow test results for various carburetters, listing consumption in pints per hour. | 8th Jun 1920 | Box 36 \ 1 scan 066 | |
| Letter from Waltham Watch Company enquiring about the results of a speedometer test and the possibility of a future contract. | 2nd Jul 1920 | Box 36 \ 1 scan 067 | |
| Letter from Waltham Watch Company regarding the despatch of cardan shaft drive fittings and pulley modification formula. | 16th Sep 1920 | Box 36 \ 1 scan 068 | |
| Letter from the Waltham Watch Company offering to supply and fit a speedometer to a car. | 22th Sep 1920 | Box 36 \ 1 scan 069 | |
| Letter from Waltham Watch Company offering a speedometer with cardan shaft drive fittings. | 22th Sep 1920 | Box 36 \ 1 scan 070 | |
| Performance of a Waltham Speedometer, noting its reliability but disliking its moving scale. | 13th Oct 1920 | Box 36 \ 1 scan 071 | |
| Invitation letter from Waltham Watch Company to visit their stand at the White City Motor Show. | 28th Oct 1920 | Box 36 \ 1 scan 072 | |
| Letter to the Waltham Watch Company with feedback on a test speedometer and a request for a replacement. | 9th Nov 1920 | Box 36 \ 1 scan 073 | |
| Letter from Waltham Watch Company discussing the fitment and reading direction of their speedometer for Rolls-Royce cars. | 10th Nov 1920 | Box 36 \ 1 scan 074 | |
| Letter from Waltham Watch Company discussing instrument bearing design and the supply of parts like belts and pulleys. | 10th Nov 1920 | Box 36 \ 1 scan 075 | |
| Letter from Waltham Watch Co. regarding the pricing and supply of speedometers and clocks, with post-script amendments following a visit. | 10th Nov 1920 | Box 36 \ 1 scan 076 | |
| Letter from Waltham Watch Company inviting Mr. Royce to tour their American factory. | 24th Nov 1920 | Box 36 \ 1 scan 077 | |
| Letter to Waltham Watch Co. Ltd. about an Experimental Car with their speedometer being sent to America. | 25th Nov 1920 | Box 36 \ 1 scan 078 | |
| Query regarding the poor performance of Elliott speedometers and the potential replacement with Waltham speedometers. | 15th Jul 1921 | Box 36 \ 1 scan 079 | |
| Comparison between the Waltham and Elliott speedometers, recommending the substitution of the latter. | 18th Jul 1921 | Box 36 \ 1 scan 080 | |
| Comparison of Waltham and Elliott speedometers, recommending the Waltham for its reliability and silence despite its moving-dial design. | 18th Jul 1921 | Box 36 \ 1 scan 081 | |
| Comparing the reliability and types of Elliott, Waltham, Watford, and Smith speedometers. | 12th Sep 1921 | Box 36 \ 1 scan 082 | |
| Returned Waltham Engine Speed Indicator for chassis 34-LW and its placement into stock. | 6th Sep 1922 | Box 36 \ 1 scan 083 | |
| Dynamometer test results for a Waltham speedometer fitted to a 49-GB car with a 15/52 axle. | 20th Oct 1922 | Box 36 \ 1 scan 084 | |
| Internal order request for one speedometer from Messrs. Waltham for a 40/50 car. | 13th Jan 1923 | Box 36 \ 1 scan 085 | |
| Instructing Stores to despatch a speedometer and drive to Messrs. Waltham. | 22th Jan 1923 | Box 36 \ 1 scan 086 | |
| Inquiry sent to Waltham Co. Ltd. regarding an Engine Revolution Counter. | 27th Jan 1927 | Box 36 \ 1 scan 087 | |
| Letter from Speight's Autocessory Company regarding the unavailability of a Waltham Engine Speed Indicator. | 28th Jan 1927 | Box 36 \ 1 scan 088 | |
| Investigating the problem of magneto contact breaker rocker 'flinging' at high speeds on the Watford machine. | 16th Feb 1916 | Box 36 \ 1 scan 089 | |
| Page 2 of a memo from R. to EFC. regarding showing something to a firm representative in Coventry. | 16th Feb 1916 | Box 36 \ 1 scan 090 | |
| Apparatus for investigating the contact breakers of magnetos. | 12th Feb 1917 | Box 36 \ 1 scan 091 | |
| Experiments on Dixie, C.A.V., and Bosch motor-cycle type magnetos. | 14th Mar 1917 | Box 36 \ 1 scan 092 | |
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