| Description | Date | Identifier | |
| Letter from E.K. Cole Ltd. regarding car radio filters and suppression equipment. | 24th Apr 1935 | Box 63 \ 3 scan0339 | |
| Letter from Philco Radio regarding the dispatch status of a Model 11T receiver from a customer's car. | 24th Apr 1935 | Box 63 \ 3 scan0340 | |
| Letter to Philco Radio & Television Corporation regarding a delay in dispatching a model 11T radio set. | 25th Apr 1935 | Box 63 \ 3 scan0341 | |
| Letter to Messrs. E.K. Cole, Ltd. requesting 20 ft. of armoured flex for wiring an experimental 40/50 chassis. | 29th Apr 1935 | Box 63 \ 3 scan0342 | |
| Letter to E.K. Cole, Ltd. requesting a complete wiring diagram for an experimental 40/50 chassis. | 30th Apr 1935 | Box 63 \ 3 scan0343 | |
| Letter from Philco regarding the stock status of a radio receiver and announcing a new model. | 30th Apr 1935 | Box 63 \ 3 scan0344 | |
| Letter from The Telegraph Condenser Company Ltd. regarding experiments and drawings for electrolytic, paper, and ignition condensers. | 30th Apr 1935 | Box 63 \ 3 scan0345 | |
| Blueprint of a 1MF Electrolytic Condenser in an aluminium tube. | 29th Apr 1935 | Box 63 \ 3 scan0346 | |
| Blueprint drawing for a .25 MFD condenser with dimensions and specifications. | 29th Apr 1935 | Box 63 \ 3 scan0347 | |
| Observations of sparks from various magnetos using two different types of revolving spark gap apparatus. | 26th May 1918 | Box 63 \ 4 scan0001 | |
| Magneto spark experiment using an eccentric disc and synchronous motor setup. | 26th May 1918 | Box 63 \ 4 scan0002 | |
| Observations and nomenclature for sparks generated by various Bosch magnetos. | 26th May 1918 | Box 63 \ 4 scan0003 | |
| Hand-drawn and annotated diagram showing observations of sparks and electrical arcing under six different conditions. | 26th May 1918 | Box 63 \ 4 scan0004 | |
| Test report detailing spark and arc behavior under various conditions and configurations. | 26th May 1918 | Box 63 \ 4 scan0005 | |
| Sketches and notes analysing the characteristics of electrical sparks and arcs under different conditions. | 26th May 1918 | Box 63 \ 4 scan0006 | |
| Analysis of spark and arc characteristics under various ignition timing and spark gap conditions. | 26th May 1918 | Box 63 \ 4 scan0007 | |
| Observations and diagrams of electrical spark and arc characteristics under different conditions. | 26th May 1918 | Box 63 \ 4 scan0008 | |
| Log page with diagrams and notes comparing spark plug conditions under different settings. | 26th May 1918 | Box 63 \ 4 scan0009 | |
| Page of diagrams illustrating various spark and arc characteristics. | 26th May 1918 | Box 63 \ 4 scan0010 | |
| Test report page logging spark observations for various components. | 26th May 1918 | Box 63 \ 4 scan0011 | |
| Diagrams illustrating the characteristics of electrical sparks and arcs under different conditions. | 26th May 1918 | Box 63 \ 4 scan0012 | |
| Page of test results with diagrams, detailing spark performance under various conditions. | 26th May 1918 | Box 63 \ 4 scan0013 | |
| Test observations of spark and arc characteristics under various conditions. | 26th May 1918 | Box 63 \ 4 scan0014 | |
| Log sheet detailing the results of various spark tests, with accompanying waveform diagrams. | 26th May 1918 | Box 63 \ 4 scan0015 | |
| Test report page detailing observations of spark characteristics for multiple configurations. | 26th May 1918 | Box 63 \ 4 scan0016 | |
| Test log sheet detailing spark test results for various configurations. | 26th May 1918 | Box 63 \ 4 scan0017 | |
| Diagrammatic analysis of different types of sparks and their characteristics. | 26th May 1918 | Box 63 \ 4 scan0018 | |
| Illustrated log page detailing various spark test results with corresponding observations. | 26th May 1918 | Box 63 \ 4 scan0019 | |
| Catalog page with illustrations and descriptions of different types of sparks. | 26th May 1918 | Box 63 \ 4 scan0020 | |
| Visual and descriptive log of different electrical spark characteristics. | 26th May 1918 | Box 63 \ 4 scan0021 | |
| Remarks on sketched sparks, comparing two different gap types and their appearance from a magneto. | 26th May 1918 | Box 63 \ 4 scan0022 | |
| Analysis of electrical arc and spark characteristics at various engine speeds and ignition timings. | 26th May 1918 | Box 63 \ 4 scan0023 | |
| Typed page analysing a pseudo-arc and retarded spark with references to sketches. | 26th May 1918 | Box 63 \ 4 scan0024 | |
| Note on the effect of an insulated third point on magneto test spark gaps. | 26th May 1918 | Box 63 \ 4 scan0025 | |
| Report page detailing conclusions from tests on magneto ignition systems, specifically the effect of a 'third point'. | 26th May 1918 | Box 63 \ 4 scan0026 | |
| Analysis of electric field disturbance by conductors in a Bosch Z.A.2 component. | 17th Jul 1917 | Box 63 \ 4 scan0027 | |
| Observations of sparks from various magnetos on a revolving spark gap apparatus. | 17th Jul 1917 | Box 63 \ 4 scan0028 | |
| Comparative study of different spark characteristics with diagrams and notes. | 17th Jul 1917 | Box 63 \ 4 scan0029 | |
| Classification chart illustrating and describing different types of electrical sparks and arcs. | 17th Jul 1917 | Box 63 \ 4 scan0030 | |
| Comparison of different types of electrical spark and arc characteristics with corresponding sketches. | 31th May 1933 | Box 63 \ 4 scan0031 | |
| Solutions for 'sparking over' issues on Bentley engines, including plug gaps, terminals, and wiring insulation. | 31th May 1933 | Box 63 \ 4 scan0032 | |
| Letter from Newtons of Taunton Ltd discussing requirements for 5 K.V. Spark Gaps. | 3rd Aug 1933 | Box 63 \ 4 scan0033 | |
| Order request for stainless steel balls for H.T. Spark Gaps. | 1st Feb 1934 | Box 63 \ 4 scan0034 | |
| Request for a more fire-proof micrometer spark gap for altitude testing and ignition coil voltage measurements. | 4th Mar 1936 | Box 63 \ 4 scan0035 | |
| To book in spark gaps as referred to on an attached advice note. | 18th Mar 1935 | Box 63 \ 4 scan0036 | |
| Request for the electrical equipment from chassis 14-GIV to be sent for examination following a 10,000-mile test. | 25th Apr 1930 | Box 63 \ 4 scan0037 | |
| Instructions for a reduced charge switching system for the 20 HP 10,000 mile chassis. | 28th Apr 1930 | Box 63 \ 4 scan0038 | |
| Inspection of experimental electrical items from chassis 23-EX after a 10,000-mile test. | 6th Jun 1930 | Box 63 \ 4 scan0039 | |
| Outlining changes to dynamo output testing, involving increased lamp usage during 15,000-mile tests. | 13th Jan 1931 | Box 63 \ 4 scan0040 | |
| New dynamo output test procedures involving extended lamp usage and supplementary laboratory tests. | 13th Jan 1931 | Box 63 \ 4 scan0041 | |
| Proposal for fitting a new dynamo and modifying the switchbox for the 25-EX car ahead of a 10,000-mile test. | 9th May 1931 | Box 63 \ 4 scan0042 | |
| List of suggested items to be fitted to a 40-50 HP chassis for a 10,000-mile test. | 19th May 1931 | Box 63 \ 4 scan0043 | |
| Note on starter motor modifications for a 40/50 chassis during a 10,000-mile test. | 23th May 1931 | Box 63 \ 4 scan0044 | |
| Correction to the switchbox circuit breaking instructions for the 40-50 HP Chassis No. 25-EX, 10,000 mile test. | 28th May 1931 | Box 63 \ 4 scan0045 | |
| Transferring special experimental electrical equipment during an engine change for a 10,000-mile test on chassis 18-GIV. | 17th Oct 1931 | Box 63 \ 4 scan0046 | |
| List of the special ignition and electrical features fitted to chassis 18.G.IV for a 10,000-mile test. | 5th Nov 1931 | Box 63 \ 4 scan0047 | |
| Instruction to delete the magneto for a 10,000 mile test on 20/25 HP. chassis 18-GIV. | 26th Jan 1932 | Box 63 \ 4 scan0048 | |
| List of required modifications for the electrical equipment on chassis 19-EX. | 9th Feb 1932 | Box 63 \ 4 scan0049 | |
| Outstanding electrical components to be fitted to chassis 19-EX for a 10,000-mile test. | 4th Apr 1932 | Box 63 \ 4 scan0050 | |
| The status of a starter motor with self-lubricated bearings and Smith instruments. | 26th Oct 1932 | Box 63 \ 4 scan0051 | |
| Summary of the electrical and ignition units to be fitted to the first Peregrine chassis for a 10,000-mile test. | 26th Oct 1932 | Box 63 \ 4 scan0052 | |
| Specification of experimental features to be fitted for a 10,000-mile test on chassis 1 J.3. | 21th Nov 1932 | Box 63 \ 4 scan0053 | |
| List of modifications and instructions for various electrical components. | 21th Nov 1932 | Box 63 \ 4 scan0054 | |
| Changing the dynamo on a Bensport chassis in France to test experimental brushes. | 6th Mar 1933 | Box 63 \ 4 scan0055 | |
| Changing the dynamos on a Bentsport chassis in France. | 6th Mar 1933 | Box 63 \ 4 scan0056 | |
| Specification of electrical equipment modifications for the 10,000 miles test on chassis 18.G.IV. | 27th Mar 1933 | Box 63 \ 4 scan0057 | |
| Test report on a Brisport I Battery after 18,000 miles of running. | 22th Jun 1933 | Box 63 \ 4 scan0058 | |
| Condition of battery separators after a vibration test. | 22th Jun 1933 | Box 63 \ 4 scan0059 | |
| The reversal tests conducted on single throw cranks. | 18th Nov 1924 | Box 63 \ 4 scan0060 | |
| Table detailing test results including RPM, number of reversals, and time run for various engine components. | 18th Nov 1924 | Box 63 \ 4 scan0061 | |
| Torsional test results for a Condor III crankshaft, showing deflection graphs and a data table. | 18th Nov 1924 | Box 63 \ 4 scan0062 | |
| Torsional test results for the Condor I crankshaft, showing deflection under torque. | 20th Dec 1929 | Box 63 \ 4 scan0063 | |
| Log sheet for a crankshaft endurance test for design 989. | 20th Dec 1929 | Box 63 \ 4 scan0064 | |
| Rig for testing model cranks. | 12th Feb 1930 | Box 63 \ 4 scan0065 | |
| Calculations for increasing flywheel inertia by 30% for model crank tests. | 12th Feb 1930 | Box 63 \ 4 scan0066 | |
| Letter to Major B.C. Carter of the Royal Aircraft Establishment regarding crankshaft stiffness calculations. | 28th Mar 1929 | Box 63 \ 4 scan0067 | |
| Comparison of calculated and observed critical speeds for various engines using different formulas. | 9th Mar 1929 | Box 63 \ 4 scan0068 | |
| Letter from the Royal Aircraft Establishment comparing calculations for torsional vibration. | 9th Mar 1929 | Box 63 \ 4 scan0069 | |
| Calculations and analysis of crank stiffness and torsional resonance speeds, comparing calculated results with test data. | 9th Mar 1929 | Box 63 \ 4 scan0070 | |
| Analysis of engine vibration criticals, orders, and resonance speeds in various cylinder configurations. | 9th Mar 1929 | Box 63 \ 4 scan0071 | |
| Paper by Frank M. Lewis regarding naval architecture and marine engineering. | 3rd Sep 1929 | Box 63 \ 4 scan0072 | |
| Letter to Major Carter at the Royal Aircraft Establishment discussing discrepancies in crankshaft torsion test results. | 3rd Sep 1929 | Box 63 \ 4 scan0073 | |
| Crankshaft design, torsional vibration analysis, and testing methods for different car engines. | 3rd Sep 1929 | Box 63 \ 4 scan0074 | |
| Letter discussing experiments on car engine vibrations at high revs and seeking suggestions regarding their cause. | 20th Jun 1925 | Box 63 \ 4 scan0075 | |
| Comparative table of torsion test results for various engine crankshafts. | 20th Jun 1925 | Box 63 \ 4 scan0076 | |
| Comparative table of crankshaft dimensions for various Rolls-Royce and other engines. | 20th Jun 1929 | Box 63 \ 4 scan0077 | |
| Technical drawing of a crankshaft. | 13th Aug 1919 | Box 63 \ 4 scan0078 | |
| Technical drawing of a crankshaft with larger pins. | 28th Aug 1929 | Box 63 \ 4 scan0079 | |
| Blueprint of a Chrysler '75' crankshaft with dimensions and weight calculations. | 28th May 1929 | Box 63 \ 4 scan0080 | |
| Letter from the Royal Aircraft Establishment discussing crankshaft stiffness and analysis methods. | 30th Sep 1929 | Box 63 \ 4 scan0081 | |
| Engine vibration, specifically regarding critical speeds, crankshaft flexing, and flywheel systems in various engine types. | 30th Sep 1929 | Box 63 \ 4 scan0082 | |
| Page 3 of a letter discussing lateral and torsional engine vibration, recommending further investigation. | 4th Sep 1929 | Box 63 \ 4 scan0083 | |
| Proposal to incorporate a low inertia slipper wheel with a stiffer crankshaft and a request for a corresponding drawing. | 4th Sep 1929 | Box 63 \ 4 scan0084 | |
| The machining and testing of two Nitro Alloy crankshafts. | 13th Sep 1929 | Box 63 \ 4 scan0085 | |
| Torsion test report for a 20 HP (China) crankshaft. | 14th Oct 1929 | Box 63 \ 4 scan0086 | |
| Crankshaft periods and torsional vibration in V-S engines. | 6th Oct 1929 | Box 63 \ 4 scan0087 | |
| Analysis of engine crankshaft stiffness and vibration periods with proposed solutions. | 6th Oct 1929 | Box 63 \ 4 scan0088 | |
| Engine vibration solutions, comparing a damped spring drive with altering the engine V-angle. | 6th Oct 1929 | Box 63 \ 4 scan0089 | |
| Page discussing altering a cylinder angle and consulting Major Carter of R.A.E. on an engine type. | 16th Oct 1929 | Box 63 \ 4 scan0090 | |
| Assessment of competitor 8-cylinder V-type engines, noting their performance and torsional vibration issues. | 16th Oct 1929 | Box 63 \ 4 scan0091 | |
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