| Description | Date | Identifier | |
| Instruction note critiquing a replacements scheme, emphasizing durability over unproven revolutionary claims. | 1st Dec 1924 | Box 35 \ 4 scan 198 | |
| Letter from L.P.S. Electrical Co. advocating for the use of Tungsten over Platinum for electrical contacts. | 19th Jan 1917 | Box 35 \ 5 scan 001 | |
| Trial of tungsten contacts for contact breakers. | 29th Jan 1917 | Box 35 \ 5 scan 002 | |
| Letter from The L.P.S. Electrical Company regarding fitting Tungsten Contacts to Magneto Contact Breakers. | 1st Feb 1917 | Box 35 \ 5 scan 003 | |
| Tungsten contacts for contact breakers oxidising and a suggestion to order replacements. | 7th Feb 1917 | Box 35 \ 5 scan 004 | |
| Letter from The L.P.S. Electrical Co. concerning the return and pricing of Watford Magneto Contact Breakers. | 26th Mar 1917 | Box 35 \ 5 scan 005 | |
| Testing of new Tungsten contact breaker contacts as a replacement for platinum ones. | 28th Mar 1917 | Box 35 \ 5 scan 006 | |
| Experiment report on the failure of tungsten contact breaker contacts, recommending platinum as an alternative. | 30th Apr 1917 | Box 35 \ 5 scan 007 | |
| Letter detailing the test results of Tungsten magneto contact breakers on an aero engine. | 1st May 1917 | Box 35 \ 5 scan 008 | |
| Letter from The L.P.S. Electrical Co. regarding misfiring Tungsten Contacts on an Aero Engine and Sparking Plug Insulators. | 2nd May 1917 | Box 35 \ 5 scan 009 | |
| Letter from L.P.S. Electrical Co. regarding the development of new Tungsten contacts for Magnetos. | 30th May 1917 | Box 35 \ 5 scan 010 | |
| Letter from The L.P.S. Electrical Co. about a new composition of Tungsten Contact for magnetos. | 15th Sep 1917 | Box 35 \ 5 scan 011 | |
| Letter from The L.P.S. Electrical Co. confirming that an item will be made up. | 15th Sep 1917 | Box 35 \ 5 scan 012 | |
| Cover note regarding an attached letter from The L.P.S. Electrical Co. concerning Tungsten Contracts for Magneto Service. | 17th Sep 1917 | Box 35 \ 5 scan 013 | |
| Letter concerning the testing of a new composition of Tungsten contacts for magneto contact breakers on aero engines. | 19th Sep 1917 | Box 35 \ 5 scan 014 | |
| Letter from The L.P.S. Electrical Co. regarding refitting two Magneto Contact Breakers with new Tungsten Points. | 20th Sep 1917 | Box 35 \ 5 scan 015 | |
| Tungsten Magneto Contacts, advising to tighten the Rocker Arm Bearing before use. | 4th Dec 1917 | Box 35 \ 5 scan 016 | |
| Letter from The L.P.S. Electrical Co. regarding the supply and testing of experimental Tungsten Contacts for magnetos. | 3rd Dec 1917 | Box 35 \ 5 scan 017 | |
| Confirmation of receipt for two Contact Breakers for Magnetos from the L.P. Electrical Co., with a handwritten follow-up note. | 4th Dec 1917 | Box 35 \ 5 scan 018 | |
| Of goods received for contact breakers for magnetos. | 4th Dec 1917 | Box 35 \ 5 scan 019 | |
| Receiving two Watford magneto contact breakers sent to be tipped with tungsten. | 4th Dec 1917 | Box 35 \ 5 scan 020 | |
| Testing new tungsten magneto contact breakers from L.P.S. Co, noting loose rocker arms and a missing brush. | 6th Dec 1917 | Box 35 \ 5 scan 021 | |
| Follow-up letter from The L.P.S. Electrical Co. inquiring about the results of testing Tungsten Contacts. | 11th Feb 1918 | Box 35 \ 5 scan 022 | |
| Letter concerning the testing of Tungsten Contacts on a new Experimental Aero Engine. | 13th Feb 1918 | Box 35 \ 5 scan 023 | |
| List of experiments fitted to the Experimental 'G' Engine, which is ready for testing. | 14th Mar 1918 | Box 35 \ 5 scan 024 | |
| Extract from a report on a visit to the Delco factory, discussing ignition distributor design. | 17th Apr 1918 | Box 35 \ 5 scan 025 | |
| Technical comparison of ignition distributor designs, focusing on materials and firing intervals with reference to the Liberty distributor. | 17th Apr 1918 | Box 35 \ 5 scan 026 | |
| Distributor construction materials, comparing Bakelite and hard rubber, and discussing issues with charring. | 17th Apr 1918 | Box 35 \ 5 scan 027 | |
| The design of the Remy ignition contact breaker, its materials, and performance issues at high speeds. | 17th Apr 1918 | Box 35 \ 5 scan 028 | |
| Technical report discussing the design and operation of a contact breaker with an auxiliary rocker for safeguarding against back-firing. | 17th Apr 1918 | Box 35 \ 5 scan 029 | |
| The features of a Delco contact breaker, a four-pole generator, and various ignition systems. | 17th Apr 1918 | Box 35 \ 5 scan 030 | |
| Letter from L.P.S. Electrical Co. following up on the testing of supplied Tungsten Contacts and soliciting new business. | 9th May 1918 | Box 35 \ 5 scan 031 | |
| Letter from The L.P.S. Electrical Co. regarding previous supplies and offering a quote for enamelled copper wire. | 9th May 1918 | Box 35 \ 5 scan 032 | |
| Internal request for a report on the performance of tungsten contact breaker contacts on an experimental 'G' Engine. | 10th May 1918 | Box 35 \ 5 scan 033 | |
| Requesting a test report on Tungsten Contacts to respond to an enquiry from L.P.S. Electrical Co. | 22th May 1918 | Box 35 \ 5 scan 034 | |
| Replacement of lost magneto contact breakers with new tungsten points. | 6th Jun 1918 | Box 35 \ 5 scan 035 | |
| Letter to The L.P.S. Electrical Co. regarding the testing of magneto contact breakers and sourcing of tungsten wire. | 10th Jun 1918 | Box 35 \ 5 scan 036 | |
| Confirming the handover of two contact breakers to be fitted with tungsten contacts. | 11th Jun 1918 | Box 35 \ 5 scan 037 | |
| Letter from The L.P.S. Electrical Co regarding the supply and composition of Tungsten Contacts for Contact Breakers. | 14th Jun 1918 | Box 35 \ 5 scan 038 | |
| Letter from The L.P.S. Electrical Co. regarding materials for contact breakers and enamelled copper wire. | 14th Jun 1918 | Box 35 \ 5 scan 039 | |
| Letter regarding two types of Tungsten Composition Contacts fitted to Contact Breakers sent for testing and feedback on their performance. | 9th Jul 1918 | Box 35 \ 5 scan 040 | |
| Two new types of contact breakers with tungsten composition contacts received from the L.P.S. Co. for observation. | 12th Jul 1918 | Box 35 \ 5 scan 041 | |
| Request to analyze the composition of Tungsten contact points and wire for a battery ignition system. | 25th Jul 1918 | Box 35 \ 5 scan 042 | |
| Analysis of contact points from a Remy 12-cylinder ignition set, identifying a platinum-gold alloy. | 21th Aug 1918 | Box 35 \ 5 scan 043 | |
| Fitting of contact breakers with tungsten contacts to Watford B.6 type magnetos. | 3rd Sep 1918 | Box 35 \ 5 scan 044 | |
| Visit from the Delco Company concerning battery ignition distributors and manufacturing propositions. | 6th Dec 1918 | Box 35 \ 5 scan 045 | |
| Supplier's proposal to manufacture ignition apparatus and a discussion on tungsten versus platinum terminals. | 6th Dec 1918 | Box 35 \ 5 scan 046 | |
| Tungsten oxidation in electrical contacts and criticisms of break mechanisms and a revolving brush. | 28th Apr 1917 | Box 35 \ 5 scan 047 | |
| Report discussing a carbon brush design issue, a potential cause related to a spindle and brush holder, and a disagreement over material reinforcement. | 13th Dec 1918 | Box 35 \ 5 scan 048 | |
| Request for a report on the testing of tungsten magneto contact breaker contacts in an aero engine. | 13th Dec 1918 | Box 35 \ 5 scan 049 | |
| Extract discussing battery ignition, the sourcing of tungsten points, and the metallurgical analysis of existing Remy points. | 14th Jan 1919 | Box 35 \ 5 scan 050 | |
| From EFC to EH chasing a report on testing Tungsten Contacts. | 15th Jan 1919 | Box 35 \ 5 scan 051 | |
| Issues with magnetos fitted with tungsten contacts, causing the contact breaker spring to fail. | 16th Jan 1919 | Box 35 \ 5 scan 052 | |
| Letter to Delco Electric Co. acknowledging receipt of parts and enquiring about obtaining wire to manufacture their own contacts. | 30th Jan 1919 | Box 35 \ 5 scan 053 | |
| Inquiry about obtaining wire to self-manufacture tungsten contacts for ignition systems. | 1st Mar 1929 | Box 35 \ 5 scan 054 | |
| Letter from the Remy Electric Company concerning the supply of Tungsten Contacts and the return of Distributor Caps. | 4th Feb 1919 | Box 35 \ 5 scan 055 | |
| Fitting new fibre blocks to Watford magneto contact breaker levers. | 11th Feb 1919 | Box 35 \ 5 scan 056 | |
| Confirming the fitting of magneto tungsten contacts to new contact breakers and requesting a further fitting. | 26th Mar 1919 | Box 35 \ 5 scan 057 | |
| Certificate of assay for two contact points identifying the material as metallic tungsten. | 28th Jul 1919 | Box 35 \ 5 scan 058 | |
| Testing tungsten ignition points, obtained from the Delco Company, against the usual platinum points. | 30th Sep 1919 | Box 35 \ 5 scan 059 | |
| Chasing up the modification of two tungsten ignition points taken from a Delco coil. | 10th Oct 1919 | Box 35 \ 5 scan 060 | |
| Sourcing, analysing and testing tungsten for use in high and low tension electrical contacts. | 20th Oct 1919 | Box 35 \ 5 scan 061 | |
| Suitability of Tantalum and Nickel as materials for chassis rotors and the plan to design a new test rotor. | 20th Oct 1919 | Box 35 \ 5 scan 062 | |
| Confirming the fitting of one pair of Delco Tungsten Contacts for testing. | 21th Oct 1919 | Box 35 \ 5 scan 063 | |
| Difficulty of machining a supplied piece of tungsten due to its hardness and cracks. | 21th Oct 1919 | Box 35 \ 5 scan 064 | |
| On the unsuccessful treatment of a tungsten rod for ignition points. | 23th Oct 1919 | Box 35 \ 5 scan 065 | |
| Supplied piece of Tungsten which was found to be too brittle and of insufficient purity to be used for making contacts. | 24th Oct 1919 | Box 35 \ 5 scan 066 | |
| Use of tungsten as a replacement for platinum in high and low tension contacts. | 5th Nov 1919 | Box 35 \ 5 scan 067 | |
| High and low tension contact points, suggesting an enquiry to the B.T.H. Company for Tungsten points. | 11th Nov 1919 | Box 35 \ 5 scan 068 | |
| Letter to The British Thomson-Houston Ltd. requesting a supply of tungsten wire for experiments on chassis materials. | 12th Nov 1919 | Box 35 \ 5 scan 069 | |
| Letter from The British Thomson-Houston Co. Ltd. confirming magneto contacts are made from platinum iridium and not tunsten steel. | 17th Nov 1919 | Box 35 \ 5 scan 070 | |
| Use of 'Crecium' tungsten metal from Fansteel Products Company for magneto contacts. | 21th Nov 1919 | Box 35 \ 5 scan 071 | |
| High tension contacts and a request for tungsten alloy samples from external companies. | 10th Nov 1919 | Box 35 \ 5 scan 072 | |
| Letter from Fansteel Products Co. regarding tungsten metal (Crecium) and molybdenum wire for use in contact and ignition points. | 17th Nov 1919 | Box 35 \ 5 scan 073 | |
| Suitable metal alloys for primary current circuit contact points. | 6th Nov 1919 | Box 35 \ 5 scan 074 | |
| Letter regarding a sample of Tungsten Rod for experiments on magneto contacts. | 25th Nov 1919 | Box 35 \ 5 scan 075 | |
| Letter concerning the enclosure of tungsten contact point samples for testing purposes. | 25th Nov 1919 | Box 35 \ 5 scan 076 | |
| Letter from a supplier about samples of Tungsten contact points and wire for testing. | 21th Nov 1919 | Box 35 \ 5 scan 077 | |
| Letters from General Electric and obtaining samples for a low tension contact breaker. | 25th Nov 1919 | Box 35 \ 5 scan 078 | |
| Letter from General Electric Company discussing the use and cost of tungsten rods for spark plug experiments. | 21th Nov 1919 | Box 35 \ 5 scan 079 | |
| Letter from General Electric Company regarding the use of tungsten in automobile ignition apparatus. | 18th Nov 1919 | Box 35 \ 5 scan 080 | |
| The fabrication of low-tension contact points from new tungsten material. | 27th Nov 1919 | Box 35 \ 5 scan 081 | |
| Advertisements for Tungsten products and Ironclad Switches & Fuses. | 2nd Dec 1919 | Box 35 \ 5 scan 082 | |
| List of proposed alterations and improvements for American market cars, page 6. | 2nd Dec 1919 | Box 35 \ 5 scan 083 | |
| Fitting and marking of tungsten ignition points for a 10,000-mile test. | 29th Dec 1919 | Box 35 \ 5 scan 084 | |
| The difficulty in working with a piece of tungsten for low tension contacts. | 2nd Jan 1920 | Box 35 \ 5 scan 085 | |
| List of new parts fitted to a car intended to run 10,000 miles, with accompanying remarks. | 17th Jan 1920 | Box 35 \ 5 scan 086 | |
| Requesting tests on tungsten samples for distributor and make-and-break contacts. | 17th Jan 1920 | Box 35 \ 5 scan 087 | |
| The trial of tungsten contacts for a low tension make & break system. | 19th Jan 1920 | Box 35 \ 5 scan 088 | |
| Comparison table for Tungsten used in high and low tension points from various suppliers. | 19th Jan 1920 | Box 35 \ 5 scan 089 | |
| List of contacts or rods from Fansteel Company for distributor sparking points. | 15th Jan 1920 | Box 35 \ 5 scan 090 | |
| Extract from a report on engine misfiring and performance of chassis 3EX. | 15th Jan 1920 | Box 35 \ 5 scan 091 | |
| List of parts sent from the United States for required experimental work. | 30th Jan 1920 | Box 35 \ 5 scan 092 | |
| Fitting tungsten rivets to a chassis contact breaker and the unsuitability of machining a supplied tungsten rod. | 5th Feb 1920 | Box 35 \ 5 scan 093 | |
| Instruction note regarding the fitting of tungsten rivets and the difficulty of working a tungsten rod. | 5th Feb 1920 | Box 35 \ 5 scan 094 | |
| Test report on tungsten points for battery ignition systems made from U.S.A. rivets. | 13th Feb 1920 | Box 35 \ 5 scan 095 | |
| The testing of tungsten points for battery ignition, requesting prolonged tests on an experimental car. | 16th Feb 1920 | Box 35 \ 5 scan 096 | |
| Extract from a report detailing vehicle performance and issues over two days, including engine starting problems and piston rattles. | 4th Mar 1920 | Box 35 \ 5 scan 097 | |
| The fitting of tungsten contacts for a low tension make and break system. | 12th Apr 1920 | Box 35 \ 5 scan 098 | |
| Battery ignition fault on the 2.EX car due to a faulty condenser connection. | 20th Apr 1920 | Box 35 \ 5 scan 099 | |
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