| Description | Date | Identifier | |
| Continued description of a high voltage testing apparatus for insulation using a valve, condensers, and a trembler coil. | 29th Apr 1927 | Box 24 \ 2 Scan270 | |
| Continued report on apparatus and methods for high voltage insulation testing. | 12th Sep 1926 | Box 24 \ 2 Scan271 | |
| The final development of an apparatus for insulation testing on redmanol coil cases. | 12th Sep 1926 | Box 24 \ 2 Scan272 | |
| Diagram of a high tension rectifying unit for H.T.D.C. tests of insulation. | 29th Apr 1927 | Box 24 \ 2 Scan273 | |
| Blank page with a Print Room date stamp. | 29th Apr 1927 | Box 24 \ 2 Scan274 | |
| Circuit diagram for high tension direct current (HTDC) insulation tests using a trembler coil and rectifying valve. | 29th Apr 1927 | Box 24 \ 2 Scan275 | |
| The co-efficient of friction for various materials under dry and oily conditions. | 19th Oct 1927 | Box 24 \ 2 Scan276 | |
| The co-efficient of friction for various materials and viscous friction in a spring drive damper. | 20th Dec 1927 | Box 24 \ 2 Scan277 | |
| Test report on 'Ebony Sindanyo' insulating material. | 20th Dec 1927 | Box 24 \ 2 Scan278 | |
| Letter regarding the unsuitability of 'Ebony Sindanyo Insulating Material' following a test. | 21th Dec 1927 | Box 24 \ 2 Scan279 | |
| Inquiring about the composition of Redmanol and Mouldensite mouldings and the potential for non-tracking alternatives. | 14th Mar 1928 | Box 24 \ 2 Scan280 | |
| Tests on new insulating papers from Symons & Co. for ignition coils and condensers, proposing further experimental production. | 9th May 1928 | Box 24 \ 2 Scan281 | |
| Temperature leakage tests conducted on various types of insulating papers. | 8th May 1928 | Box 24 \ 2 Scan282 | |
| Comparing a new material against the standard and recommending testing for coils and condensers. | 7th Jun 1928 | Box 24 \ 2 Scan283 | |
| Comparative tests on varnished and waxed papers for use in ignition coils and condensers. | 7th Jun 1928 | Box 24 \ 2 Scan284 | |
| Tests conducted on different insulating papers to compare their electrical properties and performance under heat. | 31th May 1928 | Box 24 \ 2 Scan285 | |
| The electrical properties and dielectric strength of different paper types after repeated heat testing. | 31th May 1928 | Box 24 \ 2 Scan286 | |
| Comparison of varnished and waxed paper for use in condensers and ignition coils. | 18th Jul 1928 | Box 24 \ 2 Scan287 | |
| Correspondence on the subject of insulation impregnation, copied from The Electrical Review. | 18th Jul 1928 | Box 24 \ 2 Scan288 | |
| The process and considerations for drying and impregnating articles with varnish and compounds. | 21th Feb 1928 | Box 24 \ 2 Scan289 | |
| The use of synthetic and non-synthetic varnishes for insulating electrical windings. | 21th Feb 1928 | Box 24 \ 2 Scan290 | |
| Methods for the impregnation of electrical windings and other materials, comparing different techniques. | 19th Mar 1928 | Box 24 \ 2 Scan291 | |
| Correspondence discussing the M.A.X.E.I. patented process and the use of synthetic varnishes for impregnating windings. | 19th Mar 1928 | Box 24 \ 2 Scan292 | |
| Page of correspondence discussing methods of varnish impregnation for coils, comparing dipping, vacuum, and vacuum-pressure systems. | 19th Mar 1928 | Box 24 \ 2 Scan293 | |
| Varnish impregnation methods for coils, addressing moisture, solvent recovery, and temperature control. | 26th Mar 1928 | Box 24 \ 2 Scan294 | |
| Discussion paper on the topic of varnish insulation for the electrical industry. | 26th Mar 1928 | Box 24 \ 2 Scan295 | |
| Vacuum systems for moisture removal and appropriate temperature indicators. | 7th Apr 1928 | Box 24 \ 2 Scan296 | |
| Instructions detailing the results of bench tests on paraffin wax filled coils. | 29th Sep 1928 | Box 24 \ 2 Scan297 | |
| Investigation into coil failures caused by overheating of the immersion wax. | 8th Dec 1924 | Box 24 \ 2 Scan298 | |
| Instructions for testing coils by immersing them in paraffin wax and performing subsequent leakage tests. | 8th Dec 1924 | Box 24 \ 2 Scan299 | |
| The comparison and electrical properties of standard coils versus paraffin wax-filled coils. | 26th Jun 1929 | Box 24 \ 2 Scan300 | |
| Leakage tests on insulating paper after being heated to 200°c for six hours. | 26th Jun 1929 | Box 24 \ 2 Scan301 | |
| Test report detailing the effects of high voltage testing on paper insulation. | 8th Dec 1924 | Box 24 \ 2 Scan302 | |
| The comparative tests of varnished and waxed insulating papers for ignition coils and condensers. | 8th Jul 1929 | Box 24 \ 2 Scan303 | |
| Page 2 of a report on electrical and mechanical tests of varnished and waxed papers after heating. | 2nd Sep 1929 | Box 24 \ 2 Scan304 | |
| Choice between Oil Paper and Waxed Paper for insulating ignition coils and condensers for the 'K' Series Chassis. | 2nd Sep 1929 | Box 24 \ 2 Scan305 | |
| On the testing and standardization of varnished and waxed insulating papers for ignition coils and condensers. | 19th Sep 1929 | Box 24 \ 2 Scan306 | |
| Letter regarding a proposal from a Mr. Leonard to test his engine lubricating oils. | 20th Sep 1929 | Box 24 \ 3 Scan001 | |
| Request from an oil firm, Carless, Capel & Leonard, for a recommendation for their oil. | 11th Nov 1929 | Box 24 \ 3 Scan002 | |
| Chemical test report for 'CARLINE X. X. 1.' from Carless, Capel & Leonard. | 23th Oct 1929 | Box 24 \ 3 Scan003 | |
| Petrol and aviation spirit supply from Carless, Capel & Leonard. | 11th Feb 1931 | Box 24 \ 3 Scan004 | |
| Discussion with Mr. Leonard of Carless, Capel & Leonard regarding the supply of aviation spirit. | 11th Nov 1930 | Box 24 \ 3 Scan005 | |
| Petrol for aero engines, confirming the decision to standardize on Shell petrol due to fuel variability. | 14th Feb 1931 | Box 24 \ 3 Scan006 | |
| Internal memorandum regarding a meeting with Mr. Leonard to discuss technical difficulties. | 17th Feb 1931 | Box 24 \ 3 Scan007 | |
| Arranging a meeting in Derby regarding Carless, Capel & Leonard. | 20th Feb 1931 | Box 24 \ 3 Scan008 | |
| Short typed memo confirming convenient days for a meeting with Mr. Leonard. | 26th Feb 1930 | Box 24 \ 3 Scan009 | |
| Letter to a chemical works regarding the supply and trial of aviation spirit. | 14th Mar 1931 | Box 24 \ 3 Scan010 | |
| Letter from a chemical works company regarding a trial order for Aviation spirit. | 14th Mar 1931 | Box 24 \ 3 Scan011 | |
| Letter from Carless, Capel & Leonard requesting to collect a sample of special aviation fuel to match for a future order. | 27th Mar 1931 | Box 24 \ 3 Scan012 | |
| Letter to Messrs. Carless Capel & Leonard regarding a sample of fuel made to Specification D.T.D.139. | 28th Mar 1931 | Box 24 \ 3 Scan013 | |
| Cover note forwarding a letter from Mr. J.M. Leonard and asking for instructions on examining car X.X.1. | 15th Apr 1931 | Box 24 \ 3 Scan014 | |
| Letter from an oil company offering a Phantom II engine for inspection after it has completed over 18,000 miles. | 14th Apr 1931 | Box 24 \ 3 Scan015 | |
| Letter discussing a Phantom II engine dismantling and the effect of Carline X.X.I. lubricating oil. | 15th Apr 1931 | Box 24 \ 3 Scan016 | |
| Letter concerning the testing and supply of aviation fuel for a preliminary trial. | 21th Apr 1931 | Box 24 \ 3 Scan017 | |
| Memo about arranging a conference to decide on a treatment for a crankshaft issue related to speed and reducible periods. | 1st Sep 1947 | Box 24 \ 3 Scan018 | |
| Order for a 50-gallon drum of Aviation Fuel from Carless, Capel & Leonard. | 27th Apr 1931 | Box 24 \ 3 Scan019 | |
| Letter from Carless, Capel & Leonard following up on a trial supply of Special Aviation Fuel. | 30th Jun 1931 | Box 24 \ 3 Scan020 | |
| Follow-up letter from Carless, Capel & Leonard regarding a previous communication and soliciting new orders for fuel. | 24th Jul 1931 | Box 24 \ 3 Scan021 | |
| Letter concerning a trial of Special Aviation Fuel and a request for a further bulk order. | 30th Jun 1931 | Box 24 \ 3 Scan022 | |
| Letter from the Experimental Department regarding a sample of special aviation fuel. | 29th Jul 1931 | Box 24 \ 3 Scan023 | |
| Letter from Carless, Capel & Leonard regarding a delayed test of a barrel of Special Aviation Fuel. | 30th Jul 1931 | Box 24 \ 3 Scan024 | |
| Letter from Carless, Capel & Leonard following up on a sample of aviation fuel and motor spirit orders. | 3rd Nov 1931 | Box 24 \ 3 Scan025 | |
| Cover memo from ROY to Hs. forwarding a missing synopsis of correspondence and requesting its return. | 28th Dec 1931 | Box 24 \ 3 Scan026 | |
| Log of correspondence regarding the supply and testing of lubricating oil and motor spirit. | 28th Nov 1930 | Box 24 \ 3 Scan027 | |
| Chronological log of communications and actions regarding the supply and trial of motor spirit and aviation fuel during 1931. | 31th Dec 1931 | Box 24 \ 3 Scan028 | |
| Reasons for not using petrol from Carless, Capel & Leonard for aero engine testing. | 31th Dec 1931 | Box 24 \ 3 Scan029 | |
| Delay in testing 50 gallons of petrol from Carless, Capel & Leonard and its potential use for ordinary car work. | 31th Dec 1931 | Box 24 \ 3 Scan030 | |
| Difficulties testing petrol from Carless, Capel & Leonard and arranging future supply. | 4th Jan 1932 | Box 24 \ 3 Scan031 | |
| Standard radiator overheating during severe hill climbing and proposed cooling system improvements. | 25th Feb 1914 | Box 24 \ 4 Scan001 | |
| Letter discussing engine water temperature differences between a Napier engine and their own, suggesting experiments to improve cooling. | 8th Jun 1912 | Box 24 \ 4 Scan002 | |
| Short typed note from F.H. Royce requesting feedback on a suggestion. | 27th Aug 1912 | Box 24 \ 4 Scan003 | |
| Letter regarding the danger of engine water boiling away unnoticed while driving, with a handwritten response. | 27th Aug 1912 | Box 24 \ 4 Scan004 | |
| Report regarding engine water boiling issues in hot weather at the Bombay depot. | 1st Sep 1912 | Box 24 \ 4 Scan005 | |
| Forwarding a report on a vehicle test on the Broccone Pass in Austria. | 13th Sep 1912 | Box 24 \ 4 Scan006 | |
| Water boiling test conducted on the Broccone Pass. | 13th Sep 1912 | Box 24 \ 4 Scan007 | |
| Proposal for a system to warn the driver about low levels of engine cooling water, especially when touring in mountainous areas. | 4th Oct 1912 | Box 24 \ 4 Scan008 | |
| Tests on cooling water temperature, resulting in the instruction to cease fitting and remove dashboard screens. | 4th Oct 1912 | Box 24 \ 4 Scan009 | |
| To Mr Barrington informing him that Mr Royce has reviewed an attached document. | 10th Oct 1912 | Box 24 \ 4 Scan010 | |
| Five engine cooling tests conducted on the Broccone Pass. | 17th Sep 1912 | Box 24 \ 4 Scan011 | |
| Engine overheating during hill climbs and the proposed solutions of changing gear or fitting a more efficient radiator. | 13th May 1914 | Box 24 \ 4 Scan012 | |
| Extract from a report on car overheating issues in Spain. | 3rd Jun 1914 | Box 24 \ 4 Scan013 | |
| Enquiry from the Vienna branch regarding the high temperature of the cooling system and a request for the normal operating temperature in Celsius. | 3rd Jun 1914 | Box 24 \ 4 Scan014 | |
| Normal water temperature for the cooling system under specific road and atmospheric conditions. | 11th Jun 1914 | Box 24 \ 4 Scan015 | |
| Cooling System, clarifying the source of information in a Drawing Office report. | 15th Jun 1914 | Box 24 \ 4 Scan016 | |
| Phenomenon of water loss in engines, attributing the fault to boiling within the engine jackets rather than the radiator. | 1st Jun 1915 | Box 24 \ 4 Scan017 | |
| Radiator water levels, piping, and the development of the Northcliffe engine. | 21th Jun 1915 | Box 24 \ 4 Scan018 | |
| Experiments to test the deflection and expansion of crinkled type radiators. | 21th Jun 1915 | Box 24 \ 4 Scan019 | |
| Proposed modification to a crinkled type radiator. | 18th Mar 1916 | Box 24 \ 4 Scan020 | |
| Extract from a report on engine overheating issues, suggesting oil radiators and automatic temperature control as potential solutions. | 18th Mar 1916 | Box 24 \ 4 Scan021 | |
| Responding to a report on overheating, suggesting different bonnet types for testing to regulate oil temperature. | 18th Mar 1916 | Box 24 \ 4 Scan022 | |
| Cover note to Mr. Stent regarding an overheating issue in Australia. | 24th May 1916 | Box 24 \ 4 Scan023 | |
| Solutions for car overheating in Australia, including a sketch of a fan housing. | 24th May 1916 | Box 24 \ 4 Scan024 | |
| Solutions for vehicle overheating issues, referencing a report from Australia and suggesting thermostats. | 24th May 1916 | Box 24 \ 4 Scan025 | |
| Complaints of water boiling, requesting tests to compare the current radiator with the pre-war version. | 25th Aug 1921 | Box 24 \ 4 Scan026 | |
| Problem of water loss from the radiator during hill climbing. | 8th Sep 1921 | Box 24 \ 4 Scan027 | |
| Testing of a smaller fan pulley to address engine water boiling and loss of water. | 12th Sep 1921 | Box 24 \ 4 Scan028 | |
| Car trials, engine cooling issues, and a comparison with a Cadillac condensing tank scheme. | 10th Dec 1920 | Box 24 \ 4 Scan029 | |
| Water boiling issue with Mr. Hurlimann's car and the proposed solution of fitting a small pulley. | 15th Sep 1921 | Box 24 \ 4 Scan030 | |
| Standardisation of a smaller pulley to resolve radiator water boiling issues at high altitudes. | 19th Sep 1921 | Box 24 \ 4 Scan031 | |
| The testing of a radiator cowl and preparations for an armoured car chassis test. | 24th Sep 1921 | Box 24 \ 4 Scan032 | |
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