| Description | Date | Identifier | |
| Requesting an order for two 1 K.V.A. transformers for insulation testing based on received quotations. | 1st Dec 1920 | Box 24 \ 2 Scan070 | |
| Purchase of two transformers for insulation testing apparatus. | 10th Dec 1920 | Box 24 \ 2 Scan071 | |
| Letter from Watson & Sons providing a quotation and delivery details for an Oil Immersed Step Up Transformer. | 13th Dec 1920 | Box 24 \ 2 Scan072 | |
| Requesting an order for eight large size batten lamp holders for insulation testing transformers. | 16th Dec 1920 | Box 24 \ 2 Scan073 | |
| The uses of Bakelite-Micarta in American electrical and engineering work. | 21th Dec 1920 | Box 24 \ 2 Scan074 | |
| The use of Bakelite for impregnating coils, armatures, and condensers. | 21th Dec 1920 | Box 24 \ 2 Scan075 | |
| The materials and construction of ignition condensers, commutators, and electrical connections. | 21th Dec 1920 | Box 24 \ 2 Scan076 | |
| Westinghouse's electrical work and the various applications of Bakelite-Micarta. | 21th Dec 1920 | Box 24 \ 2 Scan077 | |
| Uses of Bakelite for various automotive components. | 21th Dec 1920 | Box 24 \ 2 Scan078 | |
| Acquisition of a High Tension (H.T.) testing transformer. | 23th Dec 1920 | Box 24 \ 2 Scan079 | |
| Letter requesting particulars for a small transformer needed for testing insulating materials. | 30th Dec 1920 | Box 24 \ 2 Scan080 | |
| Letter from W.T. Glover & Co. Ltd. discussing testing transformers and voltage requirements. | 5th Jan 1921 | Box 24 \ 2 Scan081 | |
| Letter from Royce Limited to Rolls-Royce Ltd. detailing the specifications of a small transformer and recommending an insulating varnish. | 19th Jan 1921 | Box 24 \ 2 Scan082 | |
| Letter discussing the properties of a new varnish for impregnating induction coils. | 24th Jan 1921 | Box 24 \ 2 Scan083 | |
| Abstract of a translated paper by Dr. Bultemann on the properties and breakdown of electrical insulation. | 24th Jan 1921 | Box 24 \ 2 Scan084 | |
| Continued list of insulating materials, detailing their properties and applications. | 11th Aug 1920 | Box 24 \ 2 Scan085 | |
| List of engineering materials and their properties, including insulators, resins, fibres, and oils. | 11th Aug 1920 | Box 24 \ 2 Scan086 | |
| Continued page detailing the properties of mineral oils for insulation and testing procedures. | 11th Aug 1920 | Box 24 \ 2 Scan087 | |
| Translation of a German article on insulating materials for electrical purposes, originally published in 1917. | 25th Jan 1921 | Box 24 \ 2 Scan088 | |
| The form of electrodes and its influence on puncture voltages and dielectric strength in insulating materials. | 25th Jan 1921 | Box 24 \ 2 Scan089 | |
| Dielectric breakdown, potential gradients, and the influence of temperature and specific inductive capacity on insulating materials. | 25th Jan 1921 | Box 24 \ 2 Scan090 | |
| Technical page discussing the properties and challenges of insulating materials, referencing experiments by Tesla and Fessenden. | 25th Jan 1921 | Box 24 \ 2 Scan091 | |
| Page discussing the properties and testing of insulating materials, referencing German standards. | 25th Jan 1921 | Box 24 \ 2 Scan092 | |
| The properties, regulations, and testing of insulating materials for switchboards and electrical installations. | 25th Jan 1921 | Box 24 \ 2 Scan093 | |
| The properties and uses of different electrical insulating materials such as slate, marble, mica and wood. | 25th Jan 1921 | Box 24 \ 2 Scan094 | |
| Insulating materials, focusing on the disadvantages of wood and the properties of Vulcanite. | 25th Jan 1921 | Box 24 \ 2 Scan095 | |
| Page describing the properties, composition, and applications of vulcanite, particularly as an electrical insulator. | 25th Jan 1921 | Box 24 \ 2 Scan096 | |
| Description of insulating materials including Gutta Percha, Galalith, rubber and vulkan-asbestos. | 25th Jan 1921 | Box 24 \ 2 Scan097 | |
| Technical description of cellulose-based insulators, including vulcanised fibre and nitro-cellulose. | 25th Jan 1921 | Box 24 \ 2 Scan098 | |
| Description of various cellulose-based materials like celluloid and acetylene-cellulose, their properties, and production methods for use as insulators. | 25th Jan 1921 | Box 24 \ 2 Scan099 | |
| Various early plastic insulating materials, their manufacturing processes, and properties. | 25th Jan 1921 | Box 24 \ 2 Scan100 | |
| Description of the chemical process for creating Bakelite, its properties, and different modifications. | 25th Jan 1921 | Box 24 \ 2 Scan101 | |
| The properties and applications of various dielectric and insulating materials such as Bakelite, Faturans, and Eswelite. | 25th Jan 1921 | Box 24 \ 2 Scan102 | |
| Technical description of the properties and manufacturing of glass and porcelain for insulation purposes. | 25th Jan 1921 | Box 24 \ 2 Scan103 | |
| Page detailing the manufacturing process of hard porcelain, its glazing, and its physical and electrical properties. | 25th Jan 1921 | Box 24 \ 2 Scan104 | |
| Page discussing the properties and design considerations for porcelain insulators. | 25th Jan 1921 | Box 24 \ 2 Scan105 | |
| Page discussing the properties and testing procedures for porcelain and asbestos electric insulators. | 25th Jan 1921 | Box 24 \ 2 Scan106 | |
| Page discussing the properties, composition, and sources of insulating materials, particularly asbestos. | 25th Jan 1921 | Box 24 \ 2 Scan107 | |
| The sources, processing, and applications of asbestos as an electrical insulating material. | 25th Jan 1921 | Box 24 \ 2 Scan108 | |
| Technical page discussing the properties and specifications of insulating oils for transformers and switches. | 25th Jan 1921 | Box 24 \ 2 Scan109 | |
| Testing procedures and properties of insulating oils and various insulating materials like Xylolith, asbestos-slate and duro. | 25th Jan 1921 | Box 24 \ 2 Scan110 | |
| The state of dielectric and insulating material manufacturing and classification. | 25th Jan 1921 | Box 24 \ 2 Scan111 | |
| Page discussing the progress and future developments in the field of electrical insulating materials. | 3rd Mar 1921 | Box 24 \ 2 Scan112 | |
| With questions regarding the properties and substitution of various insulating materials. | 3rd Mar 1921 | Box 24 \ 2 Scan113 | |
| Issues with porcelain insulators for ballast resistance and the proposed alternative of soap stone. | 11th Mar 1921 | Box 24 \ 2 Scan114 | |
| Visit to the Watford Magneto Company regarding insulation materials and the moulding process of 'Beldalite'. | 15th Mar 1921 | Box 24 \ 2 Scan115 | |
| Moulding processes for materials like Beldalite and ebonite, comparing techniques and finishes. | 15th Mar 1921 | Box 24 \ 2 Scan116 | |
| Investigation into the production and sourcing of moulded materials like Bakelite and Beldalite. | 10th Nov 1920 | Box 24 \ 2 Scan117 | |
| Referring to a report and attaching samples of insulation material. | 15th Mar 1921 | Box 24 \ 2 Scan118 | |
| Importance of sourcing mouldings in insulating materials like bakelite and stabalite for various electrical car parts. | 15th Mar 1921 | Box 24 \ 2 Scan119 | |
| Material sourcing and manufacturing methods for a new electrical department. | 15th Mar 1921 | Box 24 \ 2 Scan120 | |
| Manufacturing process improvements and the in-house production of electrical components. | 21th Dec 1920 | Box 24 \ 2 Scan121 | |
| Proposing the adoption of Bakelite as an insulating material for various car components. | 18th Mar 1921 | Box 24 \ 2 Scan122 | |
| Letter discussing the suitability of Bakelite and Stabalite for electrical components, noting issues with cost and quality. | 18th Mar 1921 | Box 24 \ 2 Scan123 | |
| Insulating materials, referencing pages from 'Automotive Industries' and advising of a moulded rotor being sent for inspection. | 1st Mar 1921 | Box 24 \ 2 Scan124 | |
| Properties and suitability of 'Condensite' as an alternative insulating material to 'Bakelite'. | 4th Apr 1921 | Box 24 \ 2 Scan125 | |
| Confirming an arrangement to supply a list of insulation materials for car electrical equipment. | 8th Apr 1921 | Box 24 \ 2 Scan126 | |
| Insulating materials, an American Bosch Induction Coil, and distributors. | 5th Apr 1921 | Box 24 \ 2 Scan127 | |
| The use of Bakelite and other insulating materials in magneto and coil components. | 21th Mar 1921 | Box 24 \ 2 Scan128 | |
| The properties and applications of Bakelite, Condensite, and other insulating materials. | 9th Apr 1921 | Box 24 \ 2 Scan129 | |
| Instruction sheet for sourcing samples of Bakelite, Condensite, and Beldalite insulation materials for testing. | 9th Apr 1921 | Box 24 \ 2 Scan130 | |
| Instruction memo discussing alternative manufacturing materials like Solidite, Litholite, and Lapilac. | 24th Jan 1919 | Box 24 \ 2 Scan131 | |
| Instruction sheet listing various insulation materials required for testing and their potential suppliers. | 12th Apr 1921 | Box 24 \ 2 Scan132 | |
| Note on the suppliers of various insulating materials including Solidite, Condensite, and Japilac. | 24th Jan 1919 | Box 24 \ 2 Scan133 | |
| Letter from Rolls-Royce of America regarding insulating material samples sent to Mr. Claude Johnson and Mr. F.H. Royce. | 22th Apr 1921 | Box 24 \ 2 Scan134 | |
| Letter from a supplier detailing the properties of molded insulation products, Pyroplax and Thermoplax. | 20th Apr 1921 | Box 24 \ 2 Scan135 | |
| Letter from Cutler-Hammer Mfg. Co. detailing commercial molding limits and standard breaking tests. | 22th Apr 1921 | Box 24 \ 2 Scan136 | |
| List of insulating materials used on electrical units. | 22th Apr 1921 | Box 24 \ 2 Scan137 | |
| Copy of a letter from Fleming, Birkey & Goodall Ltd. regarding 'ELO' insulating material. | 23th Apr 1921 | Box 24 \ 2 Scan138 | |
| Visit to potential suppliers for electrical porcelain insulating materials, including beads and porcelain for spark plugs. | 30th Apr 1921 | Box 24 \ 2 Scan139 | |
| Instruction sheet regarding the machining tests for samples of insulation materials. | 5th May 1921 | Box 24 \ 2 Scan140 | |
| Requesting machining tests on samples of insulating materials, including Continental Bakelite. | 6th May 1921 | Box 24 \ 2 Scan141 | |
| List of samples of insulating materials for machining tests. | 6th May 1921 | Box 24 \ 2 Scan142 | |
| Letter discussing insulating materials, highlighting the effects of humidity in England on electrical components during manufacture. | 1st May 1921 | Box 24 \ 2 Scan143 | |
| Instruction sheet discussing the use of Bakelite as a replacement for Mica and Micanite in condensers and commutators. | 18th May 1921 | Box 24 \ 2 Scan144 | |
| Use of Bakelite and other insulating materials for starter motor commutators. | 26th Apr 1921 | Box 24 \ 2 Scan145 | |
| Letter from Westinghouse Electric regarding specifications for magnet coils for a main switch and actuating box. | 24th Mar 1921 | Box 24 \ 2 Scan146 | |
| Letter providing suggestions on the construction of magnet cores, specifically regarding leads, banding, and treatment. | 24th Mar 1921 | Box 24 \ 2 Scan147 | |
| Suggestion to improve electrical insulation materials on the car by replacing Ebonite with Bakelite. | 24th Mar 1921 | Box 24 \ 2 Scan148 | |
| Material changes for an actuating box, main switch, and push button switch, primarily to Bakelite. | 24th Mar 1921 | Box 24 \ 2 Scan149 | |
| Letter to Mr. Claude Johnson regarding the use of enamelled wire for coil winding. | 24th Mar 1921 | Box 24 \ 2 Scan150 | |
| Letter from GRAY & DAVIS Inc. discussing the use of enamel wire for a magnet coil. | 25th Mar 1921 | Box 24 \ 2 Scan151 | |
| Insulation, attaching a copy of another document to be brought before the Works Committee. | 12th Apr 1921 | Box 24 \ 2 Scan152 | |
| The standardisation and testing of insulation materials. | 25th Apr 1921 | Box 24 \ 2 Scan153 | |
| Inquiry to the British Electrical & Allied Industries Research Association regarding electrical insulating materials. | 30th May 1921 | Box 24 \ 2 Scan154 | |
| Letter to Westinghouse seeking recommendations on the construction of magnet coils, comparing English and American methods. | 31th Mar 1921 | Box 24 \ 2 Scan155 | |
| Clarifying that Stirling insulating varnish is an English product and that more information can be obtained. | 31th May 1921 | Box 24 \ 2 Scan156 | |
| Forwarding a booklet from Hightensite Ltd. concerning a metal-covering process for insulating materials. | 1st Jun 1921 | Box 24 \ 2 Scan157 | |
| Letter from the British Electrical and Allied Industries Research Association concerning research into insulating materials. | 2nd Jun 1921 | Box 24 \ 2 Scan158 | |
| Cover memo forwarding a letter from the British Electrical and Allied Industries Research Association about synthetic resin insulating materials. | 9th Jun 1921 | Box 24 \ 2 Scan159 | |
| Sample of hightensite material provided for machining tests. | 15th Jun 1921 | Box 24 \ 2 Scan160 | |
| Insulation, forwarding a copy of Mr. Olley's note. | 23th Jun 1921 | Box 24 \ 2 Scan161 | |
| Letter to The Lucas Electrical Co. regarding a visit report and a sample of insulation from The Continental Fibre Co. | 12th Jul 1921 | Box 24 \ 2 Scan162 | |
| Properties and potential use of Thermoplax and Pyroplax cold moulded insulation materials. | 10th Aug 1921 | Box 24 \ 2 Scan163 | |
| Unanswered enquiry to the Igranic Electrical Co. for raw materials for mouldings. | 10th Aug 1921 | Box 24 \ 2 Scan164 | |
| On the availability of Paxolin and Bakelite for insulating experimental electrical units. | 19th Aug 1921 | Box 24 \ 2 Scan165 | |
| Inclusion of samples from Swiss Insulating Works Ltd and an attached list of recommendations. | 19th Aug 1921 | Box 24 \ 2 Scan166 | |
| List of recommended changes for insulation materials in various electrical unit components. | 31th Aug 1921 | Box 24 \ 2 Scan167 | |
| Modified list of experimental insulations for electrical units, suggesting material substitutions. | 31th Aug 1921 | Box 24 \ 2 Scan168 | |
| List of experimental insulations for electrical units, comparing present and proposed materials. | 20th Sep 1921 | Box 24 \ 2 Scan169 | |
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