| Description | Date | Identifier | |
| Laboratory report on the chemical analysis of two samples of Ballast Resistance Wire. | 16th Jun 1926 | Box 168a \ 5 img003 | |
| Composition of ballast resistance wire and a request to query suppliers for an improved alloy. | 19th Jun 1926 | Box 168a \ 5 img004 | |
| Investigation into the optimal operating conditions and characteristics of nickel wire ballast resistance. | 24th Jun 1926 | Box 168a \ 5 img005 | |
| The use of ballast resistance wire and its application in dynamo and ignition systems. | 24th Jun 1926 | Box 168a \ 5 img006 | |
| Graph showing dynamo performance curves, plotting Ampere Output against speed at various Operating Voltages. | 26th Mar 1926 | Box 168a \ 5 img007 | |
| Graph showing the output of a 20 HP dynamo with various resistances in the field circuit. | 26th Mar 1926 | Box 168a \ 5 img008 | |
| Requesting an analysis of 'Mangonic' wire used for ballast resistances. | 2nd Aug 1926 | Box 168a \ 5 img009 | |
| Laboratory report on the chemical analysis of 'Mangonic' wire. | 17th Aug 1926 | Box 168a \ 5 img010 | |
| Development and testing of a new double ballast resistance for vehicle ignition systems. | 2nd Sep 1926 | Box 168a \ 5 img011 | |
| Testing of 'Mangonic' wire, a nickel-manganese alloy, for use in double ballast resistances. | 2nd Sep 1926 | Box 168a \ 5 img012 | |
| Graph showing the volt-ampere characteristic of a standard ballast resistance made from nickel wire. | 13th May 1926 | Box 168a \ 5 img013 | |
| Graph showing the volt-ampere characteristics for four different types of double ballast resistances. | 3rd Sep 1929 | Box 168a \ 5 img014 | |
| Graph showing the volt-ampere characteristics of a Delco-Remy ballast resistance. | 4th Nov 1925 | Box 168a \ 5 img015 | |
| Chemical analysis report for Nickel Ballast Resistance Wires. | 16th Sep 1926 | Box 168a \ 5 img016 | |
| Blueprint for a Ballast Resistance Wire, reference D.71224. | 4th Oct 1926 | Box 168a \ 5 img017 | |
| Production test procedure for a paper dielectric condenser for battery ignition. | 15th Oct 1926 | Box 168a \ 5 img018 | |
| Testing procedures for condensers, detailing checks for static charge, capacity, and sparking. | 1st Sep 1927 | Box 168a \ 5 img019 | |
| Experiments with double value ballast resistances for ignition circuits to improve platinum point life. | 1st Sep 1927 | Box 168a \ 5 img020 | |
| Road test report on engine misfiring and ignition performance under varied battery voltages on chassis 12-EX and 11-G3. | 1st Sep 1927 | Box 168a \ 5 img021 | |
| Comparison of a pure nickel wire's properties, including gauge, length, and resistance, against a standard specification. | 1st Sep 1927 | Box 168a \ 5 img022 | |
| Standardisation of a ballast resistance nickel wire for a chassis part. | 9th Sep 1927 | Box 168a \ 5 img023 | |
| Standardisation form for introducing a new pattern clutch release thrust bearing. | 8th Sep 1927 | Box 168a \ 5 img024 | |
| Specification for a special ballast resistance unit, detailing wire type, length and resistance value. | 6th Nov 1928 | Box 168a \ 5 img025 | |
| Specification for an intermediate value ballast resistance wire. | 16th Nov 1928 | Box 168a \ 5 img026 | |
| Weak battery ignition on the 20-HP chassis causing misfires at low speed. | 17th Dec 1928 | Box 168a \ 5 img027 | |
| Testing an experimental ballast resistance for the 20 HP Battery Ignition system. | 18th Dec 1928 | Box 168a \ 5 img028 | |
| Special 1.5 value ballast resistance for car 18-EX. | 18th Dec 1928 | Box 168a \ 5 img029 | |
| Proposing the standardization of a one and a half value ballast resistance to address a weakness in the 20 HP battery ignition. | 18th Dec 1928 | Box 168a \ 5 img030 | |
| Agreeing to put a 1 1/2 valve ballast resistance into production to resolve a misfire issue. | 28th Dec 1928 | Box 168a \ 5 img031 | |
| Specification table for different types of nickel wire ballast resistances. | 4th Jan 1929 | Box 168a \ 5 img032 | |
| Requesting the supply of a one-and-a-half value ballast resistance. | 7th Jan 1929 | Box 168a \ 5 img033 | |
| Request to the Experimental Department for three ignition ballast resistances using a specific length and gauge of nickel wire. | 16th Jan 1929 | Box 168a \ 5 img034 | |
| Specification for 1¼ and 1¾ value ballast resistances. | 19th Jan 1929 | Box 168a \ 5 img035 | |
| Experiments on ballast resistances to reduce internal ignition coil heating. | 16th Jan 1929 | Box 168a \ 5 img036 | |
| Specification sheet for 1 1/4 and 1 1/2 value ballast resistance. | 19th Jan 1929 | Box 168a \ 5 img037 | |
| Change to a 1-3/4 value ballast resistance to cure high-speed misfiring. | 30th Jan 1929 | Box 168a \ 5 img038 | |
| Testing and replacement of 1.5 value ballast resistances. | 9th Feb 1929 | Box 168a \ 5 img039 | |
| Request to supply two ballast resistances of the latest type for chassis number 54733. | 13th Feb 1929 | Box 168a \ 5 img040 | |
| Cover note for the specification of production inspection and test of a Value Ballast Resistance. | 13th Feb 1929 | Box 168a \ 5 img041 | |
| Production test and inspection procedure for a ballast resistance used in an ignition coil. | 13th Feb 1929 | Box 168a \ 5 img042 | |
| Requesting a newly standardised ballast resistance be fitted to chassis 22-EX for a 10,000-mile ignition system test. | 19th Feb 1929 | Box 168a \ 5 img043 | |
| Instruction to alter the old standard double value ballast resistance by shortening the working wire length. | 19th Feb 1929 | Box 168a \ 5 img044 | |
| The supply and charging of ballast resistances for a 20 HP chassis to a Portuguese retailer. | 27th May 1930 | Box 168a \ 5 img045 | |
| Ballast resistances and tungsten contact points for a 20 HP Rugeroni chassis. | 28th May 1930 | Box 168a \ 5 img046 | |
| Clarifying an order for ballast resistances for a 20 HP chassis for a customer named Rugeroni. | 6th Jun 1930 | Box 168a \ 5 img047 | |
| Log sheet tracking tests on a half-value old standard ballast resistance. | 3rd Jan 1929 | Box 168a \ 5 img048 | |
| Test record sheet logging the performance of a 1% value old standard ballast resistance. | 3rd Jan 1929 | Box 168a \ 5 img049 | |
| Test report on ballast resistance with mileage readings over time. | 3rd Apr 1929 | Box 168a \ 5 img050 | |
| Confirming a change in the manufacturing process for the ballast resistance from brazing to soldering. | 5th Feb 1931 | Box 168a \ 5 img051 | |
| Testing a soldered ballast resistance, concluding it is suitable for production as a replacement for the previously brazed version. | 5th Feb 1931 | Box 168a \ 5 img052 | |
| Expressing concern over changing from silver soldering to ordinary solder for the ballast resistance. | 7th Feb 1931 | Box 168a \ 5 img053 | |
| Fitting a standard ballast resistance with soldered terminals for testing. | 2nd Feb 1931 | Box 168a \ 5 img054 | |
| Request to test ballast resistances with soldered connections instead of brazed ones. | 1st Apr 1931 | Box 168a \ 5 img055 | |
| Request to remove an ignition coil and ballast from chassis 19-GIV for testing and replacement due to a mysterious fault. | 21th Oct 1931 | Box 168a \ 5 img056 | |
| On the rapid wear of distributor contact points caused by excessive cooling of the ballast resistance at high speeds. | 1st Jan 1932 | Box 168a \ 5 img057 | |
| Burnt contact points on chassis 18-GIV and the need to shield the ballast resistance. | 27th Jan 1932 | Box 168a \ 5 img058 | |
| Standardisation of a Ballast Resistance with a one-piece vitreous insulator and mechanically fastened wire. | 5th Oct 1931 | Box 168a \ 5 img059 | |
| Form for tracking the standardisation of a new chassis part, including costs and approval signatures. | 12th Jan 1932 | Box 168a \ 5 img060 | |
| Request to produce two temporary shields for the ballast resistance on 'Peregrine II' cars, chassis numbers 3 & 4. | 19th Jan 1933 | Box 168a \ 5 img061 | |
| Comparative tests of Peregrine and 20/25 battery ignition systems using various ballast resistances. | 26th Jan 1933 | Box 168a \ 5 img062 | |
| Performance data for a single breaker distributor standard coil at different ballast resistances. | 18th Dec 1936 | Box 168a \ 5 img063 | |
| Request to make and fit three Ballast Resistances for standardisation tests on a Bentley Chassis. | 18th Dec 1936 | Box 168a \ 5 img064 | |
| Extract from a customer letter regarding water ingress causing a starting issue on a Phantom III chassis. | 7th Apr 1937 | Box 168a \ 5 img065 | |
| Failure of coil resistances due to water ingress and the proposed solution of drilling a drain hole. | 7th Apr 1937 | Box 168a \ 5 img066 | |
| Failure in the ignition ballast box due to water ingress, with a proposed modification. | 8th Apr 1937 | Box 168a \ 5 img067 | |
| Phantom III chassis ignition failure due to water in the ballast resistance box. | 9th Apr 1937 | Box 168a \ 5 img068 | |
| Failure on a Phantom III chassis due to water in the ballast resistance case. | 12th Apr 1937 | Box 168a \ 5 img069 | |
| The testing and standardisation of a new 'Glowray' wire ignition ballast resistance to improve ignition performance and contact point life. | 28th May 1937 | Box 168a \ 5 img070 | |
| New standardized Ballast Resistance Wire blueprints for all chassis. | 9th Jun 1937 | Box 168a \ 5 img071 | |
| Standardisation of an ignition ballast resistance wound with 'Glowray' wire for a 25/30 HP model. | 2nd Jun 1937 | Box 168a \ 5 img072 | |
| Production note regarding the estimated tool cost for the 'S2' Series chassis. | 2nd Jun 1937 | Box 168a \ 5 img073 | |
| Standardisation of parts report for an ignition ballast resistance wound with 'Glowray' wire. | 2nd Jun 1937 | Box 168a \ 5 img074 | |
| Standardisation of parts for a roller steady for a milling cutter. | 10th Sep 1936 | Box 168a \ 5 img075 | |
| Standardisation of parts for the Phantom III, specifically an ignition ballast resistance wound with 'Glowray' wire. | 17th Jun 1937 | Box 168a \ 5 img076 | |
| Sanction for the standardisation of parts for the S.S. Lister automatic group, to be introduced from the 'E' series chassis onwards. | 14th Sep 1931 | Box 168a \ 5 img077 | |
| Correcting a wire specification error for Ballast Resistances used with D.75673 Coils. | 15th Jun 1937 | Box 168a \ 5 img078 | |
| Specification for a non-temperature coefficient ballast resistance for use with D.75673 coils. | 26th May 1937 | Box 168a \ 5 img079 | |
| Requesting the replacement of a trapped lead wire to the ballast resistance and other damaged ignition wiring. | 22th Sep 1938 | Box 168a \ 5 img080 | |
| Promotional letter from Hunts Motor Factors regarding their sole distributorship of Arvin Car Radio Sets. | 18th Jan 1938 | Box 168b \ 1 img001 | |
| Advertisement for Arvin 'Tailor-Fit' car radios, detailing the Standard, Master, and Deluxe models. | 28th Jan 1938 | Box 168b \ 1 img002 | |
| Proposed legislation on radio suppression for motor cars and the required testing. | 28th Jan 1938 | Box 168b \ 1 img003 | |
| Letter to World Radio Ltd. inquiring about the fitting of a Motorola wireless set model No.65 into a car. | 11th Feb 1938 | Box 168b \ 1 img004 | |
| Order for a Motorola wireless set to be fitted to a car. | 16th Feb 1938 | Box 168b \ 1 img005 | |
| Letter from World Radio Limited regarding the installation of a Motorola radio set and under-car aerials. | 15th Feb 1938 | Box 168b \ 1 img006 | |
| Letter to The World Radio Ltd. requesting a new pair of longer flexible controls for a Motorola radio set. | 23th Feb 1938 | Box 168b \ 1 img007 | |
| Telegram advising on the availability of three feet nine inch cables from stock. | 24th Feb 1941 | Box 168b \ 1 img008 | |
| Telegram received by telephone regarding the supply of three feet nine-inch cables. | 24th Feb 1936 | Box 168b \ 1 img009 | |
| Telegram received by telephone confirming the availability of cables from stock. | 24th Feb 1938 | Box 168b \ 1 img010 | |
| Short telegram message confirming an order for three feet nine inch cables. | 24th Feb 1938 | Box 168b \ 1 img011 | |
| Installation of a wireless set in a car and the requirement for a license. | 28th Feb 1938 | Box 168b \ 1 img012 | |
| The replacement of two flexible controls sent to The World Radio. | 28th Feb 1938 | Box 168b \ 1 img013 | |
| Letter to The World Radio Ltd. regarding fitting longer drives to a Motorola set and returning standard drives. | 1st Mar 1938 | Box 168b \ 1 img014 | |
| Effects of engine suppressors based on a test bed report and plans for further durability testing. | 3rd Mar 1938 | Box 168b \ 1 img015 | |
| The testing of Dubilier spark suppressors on a Bentley test bed unit. | 7th Feb 1938 | Box 168b \ 1 img016 | |
| Requesting an order for a Philco radio to replace a Motorola unit, with fitting instructions. | 12th Mar 1938 | Box 168b \ 1 img017 | |
| Request to obtain a catalogue from Delco-Remy & Hyatt Ltd. for their latest 'Philco' car radio sets. | 12th Mar 1938 | Box 168b \ 1 img018 | |
| Requesting an order for a Philco radio to replace a Motorola for car 1.B.50. | 12th Mar 1938 | Box 168b \ 1 img019 | |
| Secret memo regarding an invoice from Messrs. Park Ward for a Telescopic Wireless Aerial for B.III. | 15th Mar 1938 | Box 168b \ 1 img020 | |
| Invoice from Messrs. Park Ward for a Telescopic Aerial ordered for project B.III. | 15th Mar 1938 | Box 168b \ 1 img021 | |
| Request to issue a covering order to Park Ward & Co. Ltd. for a telescopic aerial. | 16th Mar 1938 | Box 168b \ 1 img022 | |
| | | | |
