| Description | Date | Identifier | |
| Comparative tests of Johnson and Phillip Ignition H.T. Cable against a standard cable. | 30th Aug 1937 | Box 142 \ 3 scan0326 | |
| Use of a new, softer cable for wiring inlet and exhaust plugs on the 32EX model. | 30th Aug 1937 | Box 142 \ 3 scan0327 | |
| Investigation into distributor spark-over clearance distance and discharge voltages. | 1st Sep 1937 | Box 142 \ 3 scan0328 | |
| Test results for peak voltage discharge across different gap sizes. | 1st Sep 1937 | Box 142 \ 3 scan0329 | |
| Letter to Captain Phillips of The Royal Automobile Club, thanking him for passes and inviting him to dine at the Directors' House in Duffield. | 1st Sep 1937 | Box 142 \ 3 scan0330 | |
| Laboratory report on the hardness test of a Phantom contact breaker spring, noting careless tempering. | 4th Sep 1937 | Box 142 \ 3 scan0331 | |
| Examination and recommendation for a new simplified starter switch for the Wraith III model. | 6th Sep 1937 | Box 142 \ 3 scan0332 | |
| Bench test results comparing a Lucas dynamo with a Rolls-Royce machine for the 25/30 or Bentley car. | 7th Sep 1937 | Box 142 \ 3 scan0333 | |
| Comparison report on dynamo performance, including a low-speed heating test, output performance, and noise analysis. | 7th Sep 1937 | Box 142 \ 3 scan0334 | |
| Comparison of an R.R. machine and a Lucas machine, focusing on performance, noise, and endurance. | 7th Sep 1937 | Box 142 \ 3 scan0335 | |
| Page detailing the overhaul and testing procedure for an armature machine, including road and endurance tests. | 7th Sep 1937 | Box 142 \ 3 scan0336 | |
| Graph comparing the output in amperes of a Rolls-Royce (R.R.) dynamo versus a Lucas dynamo at different speeds. | 9th Sep 1937 | Box 142 \ 3 scan0337 | |
| Performance test report on a modified PH.III starter motor comparing its efficiency and engagement to a standard model. | 9th Sep 1937 | Box 142 \ 3 scan0338 | |
| Test results for torque, main load, and engagement performance. | 9th Sep 1937 | Box 142 \ 3 scan0339 | |
| Letter to Alexander Duckham & Co. Ltd. regarding the performance of their NP.3 oil in a long mileage test. | 9th Sep 1937 | Box 142 \ 3 scan0340 | |
| The testing and performance of various K.L.G. sparking plugs. | 10th Sep 1937 | Box 142 \ 3 scan0341 | |
| Critique of 'Kewato' floor paint applied to the floor of an experimental test rig section. | 11th Sep 1937 | Box 142 \ 3 scan0342 | |
| On a modified Phantom III Starter Motor, detailing improved performance and savings in assembly time. | 15th Sep 1937 | Box 142 \ 3 scan0343 | |
| Potential inclusion of branded polishing cloths in the vehicle tool kit. | 15th Sep 1937 | Box 142 \ 3 scan0344 | |
| Ignition coil misfiring issues experienced on Wraith vehicle 32-EX. | 16th Sep 1937 | Box 142 \ 3 scan0345 | |
| Updating the procedure for stationery requisitions to reduce waste. | 16th Sep 1937 | Box 142 \ 3 scan0346 | |
| Need for extensive testing of a modified starter motor for the Phantom III chassis. | 17th Sep 1937 | Box 142 \ 3 scan0347 | |
| Declining the inclusion of polishing cloths in tool kits. | 17th Sep 1937 | Box 142 \ 3 scan0348 | |
| Testing of Lucas dynamos for 25/30 and Bentley cars, noting issues with sparking and noise. | 17th Sep 1937 | Box 142 \ 3 scan0349 | |
| Notice from the Experimental Department regarding the change of the Derby telephone number. | 18th Sep 1937 | Box 142 \ 3 scan0350 | |
| List of meals supplied to workers for the week ending September 18th. | 21th Sep 1937 | Box 142 \ 3 scan0351 | |
| Endurance test report for a Phantom III starter motor push button switch. | 21th Sep 1937 | Box 142 \ 3 scan0352 | |
| Test report on a Lucas starter motor, type N, number M.45.C. | 24th Sep 1937 | Box 142 \ 3 scan0353 | |
| Continued intermittent load test and strip examination comparing Bentley, Lucas and RR 25/30 HP machine components. | 24th Sep 1937 | Box 142 \ 3 scan0354 | |
| Technical assessment of a motor component, detailing build quality, dimensions, and weights. | 24th Sep 1937 | Box 142 \ 3 scan0355 | |
| Graph of starter motor test curves comparing R.R. and Lucas motors for a Standard Bentley. | 1st Sep 1937 | Box 142 \ 3 scan0356 | |
| Electrical failure due to regulator shorting, referencing a prior failure on a 4 1/4 litre Bentley. | 28th Sep 1937 | Box 142 \ 3 scan0357 | |
| Request for the names of employees currently working abroad. | 28th Sep 1937 | Box 142 \ 3 scan0358 | |
| Listing employees working abroad, including their names, check numbers, and locations. | 29th Sep 1937 | Box 142 \ 3 scan0359 | |
| Official order for rubber blocks from British Tyre & Rubber Co. Ltd. | 29th Sep 1937 | Box 142 \ 3 scan0360 | |
| Production schedule for chassis testing, detailing weekly output and series positions for different models. | 4th Oct 1937 | Box 142 \ 3 scan0361 | |
| Information about the engine used by Campbell for a record attempt. | 4th Oct 1937 | Box 142 \ 3 scan0362 | |
| Request to the Electrical Department to overhaul a starter motor from the Bentley bed in No.5 Test House. | 4th Oct 1937 | Box 142 \ 3 scan0363 | |
| Letter from Electric & Musical Industries regarding a Consumers' Research Bulletin on American motor cars. | 4th Oct 1937 | Box 142 \ 3 scan0364 | |
| Experimental use and testing of magnesium castings for engine components like pistons and crankcases. | 1st Jan 1925 | Box 142 \ 4 scan0001 | |
| The testing of magnesium pistons, detailing weight savings and cracking issues. | 12th Jun 1925 | Box 142 \ 4 scan0002 | |
| Visit from F.A. Hughes & Co. to discuss the latest developments, applications, and corrosion resistance of magnesium castings. | 1st Jul 1926 | Box 142 \ 4 scan0003 | |
| Meeting with the Magnesium Co., Ltd. concerning the casting of magnesium alloy parts. | 28th Sep 1926 | Box 142 \ 4 scan0004 | |
| Composition of light alloys used for bearing caps and pistons. | 1st Dec 1925 | Box 142 \ 4 scan0005 | |
| On the testing of magnesium pistons in a Phantom car, comparing their weight and performance against standard pistons. | 25th Feb 1927 | Box 142 \ 4 scan0006 | |
| Decisions on ordering forged and cast special magnesium pistons for a Phantom chassis. | 10th Mar 1927 | Box 142 \ 4 scan0007 | |
| Failure of magnesium pedestal pistons after 1000 miles and the need for a design alteration. | 18th May 1927 | Box 142 \ 4 scan0008 | |
| Investigation of inertia and temperature stresses in pedestal type pistons E. 75540. | 18th May 1927 | Box 142 \ 4 scan0009 | |
| Request for testing on two failed magnesium pistons to compare them with aluminium pistons. | 28th May 1927 | Box 142 \ 4 scan0010 | |
| Failure of Maxium and Magnesium pistons at high temperatures and proposing further material tests. | 1st Jun 1927 | Box 142 \ 4 scan0011 | |
| The composition and analysis of two different light alloy pistons, one for an aero engine and one for a car engine. | 20th Mar 1928 | Box 142 \ 4 scan0012 | |
| Composite piston design for aero work and the use of magnesium alloys for weight reduction. | 20th Mar 1928 | Box 142 \ 4 scan0013 | |
| Comparison of Electron Magnesium Alloy and Aluminium pistons for engines from BMW and Daimler Benz. | 19th Mar 1928 | Box 142 \ 4 scan0014 | |
| Letter discussing the unsuitability of Electron pistons for aircraft engines and proposing future investigation into Magnesium pistons. | 19th Mar 1928 | Box 142 \ 4 scan0015 | |
| Technical drawing of an Elektron piston with dimensions and parts list. | 17th Aug 1928 | Box 142 \ 4 scan0016 | |
| Engineering drawing for an 'Elektron-Kolben' (Elektron Piston). | 31th Oct 1927 | Box 142 \ 4 scan0017 | |
| Potential use of magnesium pistons in 6-cylinder car engines. | 27th Mar 1928 | Box 142 \ 4 scan0018 | |
| The corrosion of magnesium, referencing two relevant academic papers. | 27th Dec 1933 | Box 142 \ 4 scan0019 | |
| Comparative costs for magnesium castings for a Bentley car against current aluminium alloys. | 24th Feb 1934 | Box 142 \ 4 scan0020 | |
| The testing and dimensional examination of Magnesium Alloy castings for Bentley and PV.XII aero engines. | 27th Feb 1934 | Box 142 \ 4 scan0021 | |
| Holding off on the use of magnesium for the Phantom III engine due to corrosion concerns. | 17th Jun 1936 | Box 142 \ 4 scan0022 | |
| List comparing the weights of Phantom III unit components made from Aluminum versus Magnesium. | 17th Jun 1936 | Box 142 \ 4 scan0023 | |
| Letter to High Duty Alloys Ltd. discussing the potential use of magnesium castings on car work to save weight. | 27th Jun 1936 | Box 142 \ 4 scan0024 | |
| Letter from High Duty Alloys Ltd. discussing the supply, price, and use of Magnesium castings. | 30th Jun 1936 | Box 142 \ 4 scan0025 | |
| Page two of a letter to W. A. Rowbotham discussing a talk on the properties of aluminium alloys. | 30th Jun 1936 | Box 142 \ 4 scan0026 | |
| Letter to W.C. Devereux of High Duty Alloys Ltd. confirming arrangements for a meeting in Derby. | 1st Jul 1936 | Box 142 \ 4 scan0027 | |
| Letter to Crossley Motors Ltd. requesting information about their technique for producing magnesium castings. | 1st Jul 1936 | Box 142 \ 4 scan0028 | |
| Letter from Crossley Motors comparing the weight of engine components made from aluminium versus magnesium (electron). | 3rd Jul 1936 | Box 142 \ 4 scan0029 | |
| Letter to W.A. Robotham Esq. detailing the weight difference of a crankcase when changing its material from aluminium to electron. | 4th Jul 1936 | Box 142 \ 4 scan0030 | |
| Letter to Crossley Motors inquiring about the costs and manufacturing location of magnesium castings compared to aluminium. | 4th Jul 1936 | Box 142 \ 4 scan0031 | |
| Letter from Crossley Motors Ltd. regarding their suppliers and costs for magnesium castings. | 6th Jul 1936 | Box 142 \ 4 scan0032 | |
| Loan of a scrap Bentley crankcase to the Birmingham Aluminium Casting Co. Ltd. for examination. | 20th Nov 1936 | Box 142 \ 4 scan0033 | |
| Letter confirming verbal arrangements for the supply of sand-cast Bentley crankcases and other parts. | 20th Nov 1936 | Box 142 \ 4 scan0034 | |
| Die casting quotations, modifications for a Bentley crankcase, and material alloy options. | 20th Nov 1936 | Box 142 \ 4 scan0035 | |
| Various alloys for casting engine parts, their properties, and pricing. | 20th Nov 1936 | Box 142 \ 4 scan0036 | |
| Specification sheet for various types of moulding machines for aluminium castings. | 24th Nov 1936 | Box 142 \ 4 scan0037 | |
| Investigation into die castings and less costly alloys for manufacturing components. | 23th Nov 1936 | Box 142 \ 4 scan0038 | |
| Options for reducing car unit costs and weight through cheaper alloys and die casting. | 23th Nov 1936 | Box 142 \ 4 scan0039 | |
| Cost analysis estimating savings on 25/30 and Bentley engine components by changing production to die casting. | 23th Nov 1936 | Box 142 \ 4 scan0040 | |
| Letter from Leyland Motors discussing the cost of a passenger gearbox and comparing die casting to sand casting. | 12th Nov 1936 | Box 142 \ 4 scan0041 | |
| Letter to a supplier regarding drawings for die casting various engine components and requesting a quotation. | 24th Nov 1936 | Box 142 \ 4 scan0042 | |
| Letter to Messrs Hepworth & Granage Ltd. regarding a meeting to discuss cylinder liner materials. | 24th Nov 1936 | Box 142 \ 4 scan0043 | |
| Meeting report on the standards for aluminium castings, specifically concerning cylinder head jacket cores and wall thicknesses. | 25th Nov 1936 | Box 142 \ 4 scan0044 | |
| Meeting notes discussing design improvements and modifications for engine cylinder block cores and castings, specifically for the Phantom III. | 25th Nov 1936 | Box 142 \ 4 scan0045 | |
| Engine casting techniques for crankcases and cylinder blocks, comparing different engine designs. | 26th Nov 1936 | Box 142 \ 4 scan0046 | |
| Comparing the weights of Phantom III crankcase castings from two different suppliers. | 26th Nov 1936 | Box 142 \ 4 scan0047 | |
| Reducing the weight of aluminium castings for the Phantom III crankcase. | 25th Nov 1936 | Box 142 \ 4 scan0048 | |
| Pros and cons of die castings versus sand castings and the use of cheaper alloys. | 25th Nov 1936 | Box 142 \ 4 scan0049 | |
| Letter to Birmingham Aluminium Castings Co. Ltd. inquiring if the Phantom III crankcase can be made thinner to save weight. | 25th Nov 1936 | Box 142 \ 4 scan0050 | |
| Suggesting a list of parts be manufactured as die castings to reduce costs. | 27th Nov 1936 | Box 142 \ 4 scan0051 | |
| Note on alloys and die casting, which will not be circulated as it adds little to existing knowledge. | 27th Nov 1936 | Box 142 \ 4 scan0052 | |
| Letter from The Birmingham Aluminium Casting Co. acknowledging receipt of correspondence and confirming a visit from Mr. Raby. | 28th Nov 1936 | Box 142 \ 4 scan0053 | |
| Letter from The Birmingham Aluminium Casting Company Ltd. regarding a proposed visit. | 30th Nov 1936 | Box 142 \ 4 scan0054 | |
| Letter to a supplier regarding drawings for brake drums and a request for a quotation on die casting. | 1st Dec 1936 | Box 142 \ 4 scan0055 | |
| Requesting enquiries for a list of die cast parts. | 1st Dec 1936 | Box 142 \ 4 scan0056 | |
| List of parts be changed from castings to hot pressings (Diatampo) to save on material and labour. | 3rd Dec 1936 | Box 142 \ 4 scan0057 | |
| Letter from the Experimental Department arranging a visit to The Birmingham Aluminium Casting Company to discuss castings and estimates. | 4th Dec 1936 | Box 142 \ 4 scan0058 | |
| Letter from Aluminium Protection Company, Ltd. announcing their move to new, larger premises. | 4th Dec 1936 | Box 142 \ 4 scan0059 | |
| Requesting to try castings in cheap L.S. alloy for various Wraith components. | 7th Dec 1936 | Box 142 \ 4 scan0060 | |
| Order for two Bentley top half crankcases cast in L.5. alloy. | 9th Dec 1936 | Box 142 \ 4 scan0061 | |
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