| Description | Date | Identifier | |
| Electrical experimental record sheet for an ignition coil in a case moulded of X616B powder. | 3rd Apr 1930 | Box 61 \ 1 scan0141 | |
| The testing of varnished insulating paper for ignition coils. | 31th Oct 1930 | Box 61 \ 1 scan0142 | |
| New wax, Hallowax, for impregnating electrical apparatus, comparing its properties to standard Paraffin Wax. | 1st Nov 1930 | Box 61 \ 1 scan0143 | |
| Letter from Ellison Insulations regarding samples and literature for Ellison Plastic Compound and Tufnol. | 3rd Nov 1930 | Box 61 \ 1 scan0144 | |
| Test report on the breakdown voltage of a 'Tufnol' sheet sample. | 4th Nov 1930 | Box 61 \ 1 scan0145 | |
| Testing of a new, thinner sample of insulating paper for ignition coils. | 12th Nov 1930 | Box 61 \ 1 scan0146 | |
| Inquiry regarding the testing of Hallowax to determine if it is superior to the current wax in use. | 22th Nov 1930 | Box 61 \ 1 scan0147 | |
| Delay of tests on Halowax due to more urgent work. | 24th Nov 1930 | Box 61 \ 1 scan0148 | |
| Submission of waxed insulating paper samples from the L.P.S. Electrical Company for testing. | 28th Nov 1930 | Box 61 \ 1 scan0149 | |
| Cover letter for a report on tests conducted on Halowax impregnating compound. | 1st Dec 1930 | Box 61 \ 1 scan0150 | |
| Test results comparing Hallowax impregnating compound to standard paraffin wax. | 4th Dec 1930 | Box 61 \ 1 scan0151 | |
| Test results for varnished and waxed insulated paper for ignition coil secondaries. | 4th Dec 1930 | Box 61 \ 1 scan0152 | |
| Letter from Joseph Lucas Ltd. to H. Royce concerning a report on lacquering cable harnesses. | 3rd Mar 1931 | Box 61 \ 1 scan0153 | |
| Material and application method for harness cable varnish. | 26th Feb 1931 | Box 61 \ 1 scan0154 | |
| Acknowledgement letter to Joseph Lucas, Limited regarding particulars of Harness Cable Varnish. | 4th Mar 1931 | Box 61 \ 1 scan0155 | |
| Request to The British Celanese, Ltd. for a sample of colourless Cellulose Varnish for testing on braided cables. | 4th Mar 1931 | Box 61 \ 1 scan0156 | |
| Letter from British Celanese Limited forwarding an enquiry about varnish to their Head Office. | 5th Mar 1931 | Box 61 \ 1 scan0157 | |
| Quotation letter from British Celanese Limited for various cable-treating lacquers and dopes. | 6th Mar 1931 | Box 61 \ 1 scan0158 | |
| Letter from British Celanese Limited regarding the supply of thinners and dopes for testing. | 6th Mar 1931 | Box 61 \ 1 scan0159 | |
| Electrical tests of Aero H.T. ignition cable sleeves made from different moulding powders. | 6th Mar 1931 | Box 61 \ 1 scan0160 | |
| Cover memo for reports on tests of insulating and synthetic moulded materials. | 9th Mar 1931 | Box 61 \ 1 scan0161 | |
| Insulation tests on discs moulded from various synthetic powders. | 5th Mar 1931 | Box 61 \ 1 scan0162 | |
| Leakage conductance tests on various insulating materials. | 9th Mar 1931 | Box 61 \ 1 scan0163 | |
| Hygroscopicity tests of various synthetic moulded materials. | 9th Mar 1931 | Box 61 \ 1 scan0164 | |
| Letter to H.D. Symons & Co. Ltd. regarding E.R.A. electrodes and apparatus. | 19th Mar 1931 | Box 61 \ 1 scan0165 | |
| Letter from H.D. Symons & Co. Ltd. providing particulars of Standard E.R.A. Electrodes. | 23th Mar 1931 | Box 61 \ 1 scan0166 | |
| Letter from H.D. Symons & Company Limited regarding a novel method for testing conductance on sheet insulating materials. | 23th Mar 1931 | Box 61 \ 1 scan0167 | |
| Letter from an electrical insulation specialist regarding a new method for testing waxed paper. | 23th Mar 1931 | Box 61 \ 1 scan0168 | |
| Letter from electrical insulation specialists H.D. Symons & Co. Ltd. discussing methods for high-pressure leakage tests on insulating papers. | 23th Mar 1931 | Box 61 \ 1 scan0169 | |
| Letter from H.D. Symons & Co. Ltd. discussing conductance test results on waxed paper. | 23th Mar 1931 | Box 61 \ 1 scan0170 | |
| Letter discussing the relative value of testing insulating papers using single versus multi-layer methods at different voltages. | 27th Mar 1931 | Box 61 \ 1 scan0171 | |
| Letter to Messrs. H. D. Symons & Co. Ltd. about the use of a high voltage test apparatus. | 27th Mar 1931 | Box 61 \ 1 scan0172 | |
| Request to manufacture four brass testing electrodes for laboratory use to an E.R.A. specification. | 27th Mar 1931 | Box 61 \ 1 scan0173 | |
| Request to obtain a publication about determining the electric strength of fibrous insulating materials. | 30th Mar 1931 | Box 61 \ 1 scan0174 | |
| The testing of 'Mouldrite' synthetic moulding powder for leakage conductance. | 2nd Apr 1931 | Box 61 \ 1 scan0175 | |
| D.T.D. and B.S. specifications for flexible and vulcanised fibre. | 8th Apr 1931 | Box 61 \ 1 scan0176 | |
| Continuation of a report on the leakage conductance and breakdown voltage of wax paper. | 6th Dec 1930 | Box 61 \ 1 scan0177 | |
| Letter discussing tests of insulating papers and enclosing related diagrams and specifications. | 11th Mar 1931 | Box 61 \ 1 scan0178 | |
| Letter explaining the function of a rectifier and a spark gap in an electrical circuit. | 11th Mar 1931 | Box 61 \ 1 scan0179 | |
| Letter to Mr. Symons of H.D. Symons & Co. Ltd. discussing the electrical principles and components of H.T. systems. | 11th Mar 1931 | Box 61 \ 1 scan0180 | |
| Letter to H.D. Symons & Co. Ltd. discussing the suitability of rectifying valves for testing equipment. | 11th Mar 1931 | Box 61 \ 1 scan0181 | |
| Letter from the Society of British Aircraft Constructors regarding the cancellation of an overlapping material specification for fibre. | 7th Apr 1931 | Box 61 \ 1 scan0182 | |
| The testing of insulating sleeves moulded in British Dyestuffs Powder. | 4th Apr 1931 | Box 61 \ 1 scan0183 | |
| Conversation about a synthetic moulding powder from B.T.H. Co. and suggesting a sample be obtained for testing. | 8th Jul 1931 | Box 61 \ 1 scan0184 | |
| Request to The British Thomson-Houston Co. Ltd. for a sample of Bakelite moulding powder and a drawing of a ferrule. | 17th Nov 1931 | Box 61 \ 1 scan0185 | |
| Letter regarding a sample of Fabrolite moulding powder and an attached blueprint for a small ferrule. | 18th Nov 1931 | Box 61 \ 1 scan0186 | |
| Letter regarding a sample of Fabrolite Moulding Powder being sent for trial. | 18th Nov 1931 | Box 61 \ 1 scan0187 | |
| The receipt of a B.T.H. Fabrolite moulding powder sample for electrical testing. | 23th Nov 1931 | Box 61 \ 1 scan0188 | |
| Letter to The British Thomson-Houston Co. Ltd requesting moulding instructions for a 'Fabrolite' powder sample which is sticking. | 25th Nov 1931 | Box 61 \ 1 scan0189 | |
| Letter providing technical advice on the use of Fabrolite Moulding Powder. | 27th Nov 1931 | Box 61 \ 1 scan0190 | |
| Letter to The British Thomson-Houston Co. Ltd. about testing Fabrolite powder for mouldings. | 30th Nov 1931 | Box 61 \ 1 scan0191 | |
| Letter from The British Thomson-Houston Company Ltd regarding a visit by Mr. Crossling to deliver Fabrolite powder. | 1st Dec 1931 | Box 61 \ 1 scan0192 | |
| Inquiry to Bakelite Ltd. regarding moulding powder for experiments with self-lubricating bearings. | 14th Dec 1931 | Box 61 \ 1 scan0193 | |
| Letter from Bakelite Limited regarding a special moulding material for self-lubricating bearings. | 16th Dec 1931 | Box 61 \ 1 scan0194 | |
| Letter to Bakelite Ltd. regarding self-lubricating moulded bakelite bearings and arranging a meeting. | 18th Dec 1931 | Box 61 \ 1 scan0195 | |
| Experiments on Bakelite self-lubricating bearings for starter motors. | 15th Jan 1932 | Box 61 \ 1 scan0196 | |
| Letter to The Brush Electrical Engineering Co Ltd. requesting samples of self-lubricating bushes. | 29th Jan 1932 | Box 61 \ 1 scan0197 | |
| Development of Bakelite oilless bushes for a starter motor. | 29th Jan 1932 | Box 61 \ 1 scan0198 | |
| Letter from The Brush Electrical Engineering Co. Ltd. regarding a query on lubrication bushes for tramway and omnibus trolley gear. | 30th Jan 1932 | Box 61 \ 1 scan0199 | |
| Inquiry to Brecknell Willis & Co. regarding self-lubricating bearings for trolley pulleys. | 1st Feb 1932 | Box 61 \ 1 scan0200 | |
| Letter from Brecknell, Willis & Co. Ltd. regarding the supply and composition of self-lubricating bushes. | 2nd Feb 1932 | Box 61 \ 1 scan0201 | |
| Letter acknowledging an enquiry response regarding self-lubricating bushes. | 3rd Feb 1932 | Box 61 \ 1 scan0202 | |
| Proposal from Mr. Brock to experiment with a self-lubricating material for mouldings from B.T.H. | 19th Feb 1932 | Box 61 \ 1 scan0203 | |
| Visit to B.T.H. Coventry regarding self-lubricating materials for mouldings and timing gears. | 13th Jan 1932 | Box 61 \ 1 scan0204 | |
| New mouldable insulating material found in Bosch products and recommending it be tested. | 23th Mar 1932 | Box 61 \ 1 scan0205 | |
| Tracking tests of Bosch moulded insulation compared to a standard bakelite material. | 1st Apr 1932 | Box 61 \ 1 scan0206 | |
| Tests conducted on Bakelite Co's powder grade X 20 - 5 for use in aero H.T. cable insulating sleeves. | 20th May 1932 | Box 61 \ 1 scan0207 | |
| Test report on insulating sleeves moulded with a new Bakelite powder, grade X20-5. | 19th May 1932 | Box 61 \ 1 scan0208 | |
| Sourcing and testing new Bakelite type materials. | 23th May 1932 | Box 61 \ 1 scan0209 | |
| Required sample quantities for testing insulating papers. | 13th Jul 1932 | Box 61 \ 1 scan0210 | |
| Request to obtain a roll of plain white insulation paper from Brittains for experiments. | 17th Aug 1932 | Box 61 \ 1 scan0211 | |
| Laboratory test report on two samples of Brittan's plain white paper impregnated by Messrs Symons for insulation properties. | 1st Oct 1932 | Box 61 \ 1 scan0212 | |
| Test results for L.P.S. Insulating Paper Grade 745/S, which was found to be of inferior quality and not recommended for production. | 7th Oct 1932 | Box 61 \ 1 scan0213 | |
| Request to order Bakelaque insulating tubes of two different specified sizes. | 11th Oct 1933 | Box 61 \ 1 scan0214 | |
| Laboratory test results for L.P.S. Paraffin Wax Insulated Paper, Grade 503. | 25th Oct 1932 | Box 61 \ 1 scan0215 | |
| Comparison of breakdown voltage test results for waxed papers between company tests (R.R.) and those from Symons. | 31th Oct 1932 | Box 61 \ 1 scan0216 | |
| Test results on waxed papers and the reliability of figures from another party. | 31th Oct 1932 | Box 61 \ 1 scan0217 | |
| Graph showing the variation of capacity and insulation resistance with temperature for four Lucas condensers. | 10th Feb 1933 | Box 61 \ 1 scan0218 | |
| Graph showing the variation of capacity and insulation resistance with temperature for two Delco-Remy condensers. | 10th Apr 1933 | Box 61 \ 1 scan0219 | |
| Graph showing the variation of capacity and insulation resistance with temperature for three T.C.C. condensers. | 18th May 1933 | Box 61 \ 1 scan0220 | |
| Letter from Bakelite Limited sending brochures on moulding materials, gears, pinions, and varnish. | 7th Apr 1934 | Box 61 \ 1 scan0221 | |
| Letter from Hadfields (Merton) Ltd requesting an appointment to discuss insulating varnishes and compounds. | 7th Jan 1935 | Box 61 \ 1 scan0222 | |
| Letter to Messrs. Hadfields (Merton) Ltd. arranging a meeting with Mr. Britton and Mr. Ryman. | 8th Jan 1935 | Box 61 \ 1 scan0223 | |
| Recommending grade 745S waxed paper for coil insulation after testing. | 12th Jan 1935 | Box 61 \ 1 scan0224 | |
| Request to test 'Formapex' insulating material as a potential alternative to 'Bakerlaque'. | 5th Feb 1935 | Box 61 \ 1 scan0225 | |
| Laboratory test results for Formapex insulating materials, recommending the CS grade as a suitable alternative to Bakerlaque. | 15th Mar 1935 | Box 61 \ 1 scan0226 | |
| Letter from Hadfields (Merton) Ltd. arranging a visit from their technical expert to discuss varnish. | 26th Apr 1935 | Box 61 \ 1 scan0227 | |
| Letter from Hadfields (Merton) Limited confirming the despatch of trial samples of insulating varnish and thinners. | 9th May 1935 | Box 61 \ 1 scan0228 | |
| Letter from Hadfields (Merton) Limited advising of a delay in handling a specification due to the illness of their technical expert. | 12th Jul 1935 | Box 61 \ 1 scan0229 | |
| The impregnation of paper with Seekay Wax for insulation purposes. | 6th Aug 1935 | Box 61 \ 1 scan0230 | |
| Letter to Ellison Insulations Ltd. inquiring about the production of a small insulated rocker block. | 6th Aug 1935 | Box 61 \ 1 scan0231 | |
| Blueprint for a modified rocker block. | 18th Jul 1935 | Box 61 \ 1 scan0232 | |
| Letter from Imperial Chemical Industries concerning a report and samples of paper impregnated with Seekay Wax. | 18th Jul 1935 | Box 61 \ 1 scan0233 | |
| Letter from Imperial Chemical Industries detailing the results of testing wire impregnated with Seekay Wax. | 7th Aug 1935 | Box 61 \ 1 scan0234 | |
| Letter from Ellison Insulations Ltd. regarding the supply and design of machined rocker blocks. | 14th Aug 1935 | Box 61 \ 1 scan0235 | |
| Advice note from Ellison Insulations for the dispatch of Tufnol Blocks. | 14th Aug 1935 | Box 61 \ 1 scan0236 | |
| Request for information on the specific inductivity and resistivity of Seekay Wax. | 29th Aug 1935 | Box 61 \ 1 scan0237 | |
| Negative electrical performance of ignition coils vacuum impregnated with Seekay Wax. | 29th Aug 1935 | Box 61 \ 1 scan0238 | |
| Letter from Ellison Insulations regarding the supply and specifications of Tufnol materials. | 29th Aug 1935 | Box 61 \ 1 scan0239 | |
| Paper on the use of plastics as engineering materials, detailing their properties, classifications, and applications. | 12th Jan 1934 | Box 61 \ 1 scan0240 | |
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