| Description | Date | Identifier | |
| Letter discussing issues and tests with American Bosch Magnetos. | 4th May 1921 | Box 49 \ 5 Scan226 | |
| Technical discussion on Bosch magneto and armature specifications, including performance graphs and material composition. | 4th May 1921 | Box 49 \ 5 Scan227 | |
| To Mr Hives discussing magneto test results, defects in American Bosch magnetos, and proposed modifications. | 4th May 1921 | Box 49 \ 5 Scan228 | |
| The experimental bench tests of a U.S.A. Bosch Magneto, type D.U.Z.6. | 4th May 1921 | Box 49 \ 5 Scan229 | |
| Test report on electrical components, including distributor dimensions, platinum point gap, and endurance test results. | 4th May 1921 | Box 49 \ 5 Scan230 | |
| Test report page detailing performance, short circuit, and utility tests conducted on a magneto component. | 4th May 1921 | Box 49 \ 5 Scan231 | |
| Performance test report detailing high and low speed sparking characteristics, resistance, and current output. | 4th May 1921 | Box 49 \ 5 Scan232 | |
| Requesting an order be forwarded for U.S.A. Bosch magnetos and related spare parts. | 21th May 1921 | Box 49 \ 5 Scan233 | |
| Correspondence from America concerning U.S.H. Bosch Magnetos and related breakdowns. | 9th Jun 1921 | Box 49 \ 5 Scan234 | |
| Instructions regarding the breakdown and replacement parts for various types of magnetos. | 9th Jun 1921 | Box 49 \ 5 Scan235 | |
| Instructions regarding a fibre bush and magneto failure on customer car X 430. | 9th Jun 1921 | Box 49 \ 5 Scan236 | |
| Letter from Rolls-Royce of America regarding payment for a Magneto and Battery System taken by Mr. Hives from Springfield to Derby. | 20th Jun 1921 | Box 49 \ 5 Scan237 | |
| Letter from Rolls-Royce of America correcting the addressee of a previously sent document concerning American Bosch Battery Ignition. | 3rd Aug 1921 | Box 49 \ 5 Scan238 | |
| List of R. Bosch and U.S.A. Bosch magnetos in the laboratory with condition remarks. | 18th Sep 1923 | Box 49 \ 5 Scan239 | |
| Complaints about condenser cover bolts chafing plates and a proposed design modification to fix the issue. | 22th Nov 1920 | Box 49 \ 5 Scan240 | |
| Suggesting modifications to the condenser studs, nuts, and earth terminal plate for 40/50 chassis. | 2nd Feb 1921 | Box 49 \ 5 Scan241 | |
| Modification to the condenser box studways. | 10th Mar 1921 | Box 49 \ 5 Scan242 | |
| Re-standardisation of a 40/50 HP condenser, focusing on a new earth connection and stud design. | 9th Jun 1921 | Box 49 \ 5 Scan243 | |
| Cover note regarding modifications to the flexible condenser earthing connection. | 1st Jul 1921 | Box 49 \ 5 Scan244 | |
| Series of questions comparing the use and properties of insulating materials like Bakelite, Micanite, Vulcanite, and Stabalite. | 3rd Mar 1921 | Box 49 \ 5 Scan245 | |
| Visit to the Watford Magneto Company regarding their insulation materials and moulding processes. | 15th Mar 1921 | Box 49 \ 5 Scan246 | |
| The moulding processes and materials such as Beldalite, ebonite, and Bakelite. | 15th Mar 1921 | Box 49 \ 5 Scan247 | |
| Manufacturing processes, including moulding materials like Bakelite and testing American Bosch Magnetos. | 29th Jun 1917 | Box 49 \ 5 Scan248 | |
| Use of moulded insulating materials like bakelite and stabalite for electrical components. | 15th Mar 1921 | Box 49 \ 5 Scan249 | |
| Material choices like bakelite, ebonite and porcelain for the electrical department. | 15th Mar 1921 | Box 49 \ 5 Scan250 | |
| Manufacturing procedures, comparing US and UK practices, and advocating for the in-house production of specific electrical components. | 10th Dec 1920 | Box 49 \ 5 Scan251 | |
| Adoption of Bakelite insulating material and a proposal to manufacture parts under license. | 18th Mar 1921 | Box 49 \ 5 Scan252 | |
| The suitability of materials like Bakelite and Stabalite for electrical components. | 18th Mar 1921 | Box 49 \ 5 Scan253 | |
| Requesting the procurement of sample sheets and bushes of various moulded insulation materials. | 8th Apr 1921 | Box 49 \ 5 Scan254 | |
| Request to obtain samples of various moulded insulating materials from a list of suppliers. | 13th Apr 1921 | Box 49 \ 5 Scan255 | |
| Page 2 of a memo regarding a potential supplier for the raw material 'Condensite'. | 13th Apr 1921 | Box 49 \ 5 Scan256 | |
| Letter from The Beldam Tyre Co. Ltd. concerning a sample of 'Beldalite' insulating material. | 1st Aug 1919 | Box 49 \ 5 Scan257 | |
| Introducing Stabilite moulding for switch barrels to save time and money. | 4th Apr 1921 | Box 49 \ 5 Scan258 | |
| Confirming receipt of letters and sending samples of 'Solidite' and 'Beldalite' moulded insulating materials. | 27th Apr 1921 | Box 49 \ 5 Scan259 | |
| Letter from The Beldam Tyre Co (1920) Ltd regarding sending samples of 'Beldalite'. | 25th Apr 1921 | Box 49 \ 5 Scan260 | |
| Visit to Messrs. North & Sons in Watford, discussing their machining and moulding processes and materials. | 2nd May 1921 | Box 49 \ 5 Scan261 | |
| Correspondence regarding samples of the moulded insulating material, Beldalite. | 18th May 1921 | Box 49 \ 5 Scan262 | |
| Comparative loading tests of Stabalite and Beldalite at various temperatures. | 2nd Feb 1921 | Box 49 \ 5 Scan263 | |
| Failures in Exide batteries and ongoing tests with other battery types. | 2nd Feb 1921 | Box 49 \ 5 Scan264 | |
| Technical discussion on different types of batteries, their components like separators, and potential new standards. | 2nd Feb 1921 | Box 49 \ 5 Scan265 | |
| Latest improvements in Tudor and British Exide batteries. | 17th Mar 1921 | Box 49 \ 5 Scan266 | |
| Modifications to batteries and an examination of a Tudor battery. | 7th Mar 1921 | Box 49 \ 5 Scan267 | |
| The construction of a battery, detailing its grids, separators, vents, terminals, and casing. | 7th Mar 1921 | Box 49 \ 5 Scan268 | |
| Report comparing Exide and De Martis batteries, detailing their features and performance claims. | 7th Mar 1921 | Box 49 \ 5 Scan269 | |
| Investigation report on a battery, detailing its construction and performance compared to a standard Exide battery. | 7th Mar 1921 | Box 49 \ 5 Scan270 | |
| Listing the weights of various batteries and the capacity of the De Martis battery. | 7th Mar 1921 | Box 49 \ 5 Scan271 | |
| The weights of various types of batteries. | 7th Mar 1921 | Box 49 \ 5 Scan272 | |
| Request for cost particulars of several new sample batteries for a report being prepared for Mr. Royce. | 7th Mar 1921 | Box 49 \ 5 Scan273 | |
| Costs and status of five different experimental batteries. | 10th Mar 1921 | Box 49 \ 5 Scan274 | |
| Test report detailing the charging and discharging treatment of a car battery. | 8th Mar 1926 | Box 49 \ 5 Scan275 | |
| Log sheet for a battery's second charge cycle and discharge performance test. | 8th Mar 1926 | Box 49 \ 5 Scan276 | |
| Test report detailing battery charge, discharge, and cell density readings. | 8th Mar 1926 | Box 49 \ 5 Scan277 | |
| Test report logging battery cell densities and charge characteristics. | 12th Mar 1921 | Box 49 \ 5 Scan278 | |
| Extract from a report on a visit discussing battery designs, condemning the Tudor model in favour of the Exide. | 12th Mar 1921 | Box 49 \ 5 Scan279 | |
| Extract from a letter from Chloride Elec Storage Co. regarding the weight of battery sets. | 1st Apr 1921 | Box 49 \ 5 Scan280 | |
| Standardisation sheet for an Exide 6 EXE 5 battery with independently supported elements. | 5th Apr 1921 | Box 49 \ 5 Scan281 | |
| Relaying Mr. Royce's remarks on a standardisation sheet for an Exide battery with independently supported elements. | 13th Apr 1921 | Box 49 \ 5 Scan282 | |
| Letter concerning the delivery of battery cells and issues with a new batch of experimental chassis batteries. | 14th Apr 1921 | Box 49 \ 5 Scan283 | |
| Letter discussing issues with battery sealing compound, cracking, and electrolyte leakage. | 14th Apr 1921 | Box 49 \ 5 Scan284 | |
| Letter from The Chloride Electrical Storage Co. Ltd. regarding the supply and approval of sample batteries. | 26th Apr 1921 | Box 49 \ 5 Scan285 | |
| The standardisation and supply of an Exide 6 BXE5 battery with independently supported plates. | 27th Apr 1921 | Box 49 \ 5 Scan286 | |
| Standardisation proposal for an Exide 6 BXE5 battery with independently supported elements. | 23th Mar 1921 | Box 49 \ 5 Scan287 | |
| Continuation sheet listing modifications to battery components, including plates, separators, and cells. | 8th Apr 1921 | Box 49 \ 5 Scan288 | |
| Recommendation to standardise the Exide Battery BXE.5 after successful testing. | 27th Apr 1921 | Box 49 \ 5 Scan289 | |
| Extract from a report on the testing and durability of the new standard Exide 6BXE5 battery. | 2nd Jun 1921 | Box 49 \ 5 Scan290 | |
| Future accumulator choices, comparing Exide and C.A.V.-Willard batteries for chassis installations. | 1st Jun 1921 | Box 49 \ 5 Scan291 | |
| Letter to a supplier regarding corrosion issues on 6BXE5 batteries due to incorrect washer material. | 15th Jun 1921 | Box 49 \ 5 Scan292 | |
| Letter discussing the material used for washers and the inspection of batteries. | 16th Jun 1921 | Box 49 \ 5 Scan293 | |
| Letter discussing issues and potential solutions for corrosion on lead washers in 6 BXE.5 batteries. | 16th Jun 1921 | Box 49 \ 5 Scan294 | |
| Letter from The Chloride Electrical Storage Co. Ltd. regarding a service visit to supply washers. | 16th Jun 1921 | Box 49 \ 5 Scan295 | |
| The replacement of brass washers with lead ones on standard 6-BXE.5 batteries. | 17th Jun 1921 | Box 49 \ 5 Scan296 | |
| Corrosion issues and design improvements for Exide and Tudor batteries. | 23th Jun 1923 | Box 49 \ 5 Scan297 | |
| Battery terminal corrosion and proposed improvements to the washer and nut arrangement. | 23th Jun 1921 | Box 49 \ 5 Scan298 | |
| Technical memorandum comparing batteries from the Tudor Company and C.A.V. | 23th Jun 1921 | Box 49 \ 5 Scan299 | |
| Price comparison of Tudor, Exide, and C.A.V. Willard batteries. | 23th Jun 1921 | Box 49 \ 5 Scan300 | |
| Letter from Chloride Electrical Storage Co regarding standard 6 BXE.5 batteries and antimonial lead washers. | 23th Jun 1921 | Box 49 \ 5 Scan301 | |
| Changeover from brass washers to antimonial lead washers for Standard 6-B.X.E.5. batteries. | 25th Jun 1921 | Box 49 \ 5 Scan302 | |
| The changeover from brass terminal washers to antimonial lead washers for BXE-5 batteries. | 27th Jun 1921 | Box 49 \ 5 Scan303 | |
| Replacing brass terminal washers on batteries and requesting a supply for repair depots. | 4th Jul 1921 | Box 49 \ 5 Scan304 | |
| The changeover of standard battery terminal washers from brass to antimonial lead. | 11th Jul 1921 | Box 49 \ 5 Scan305 | |
| Letter from The Chloride Electrical Storage Co. regarding the despatch of replacement terminal washers for starter battery sets. | 8th Jul 1921 | Box 49 \ 5 Scan306 | |
| Copy of a letter from The Chloride Electrical Storage Co Ltd regarding starter batteries and terminal washers. | 15th Jul 1921 | Box 49 \ 5 Scan307 | |
| The changeover from Brass Terminal Washers to Antimonial Lead Washers on Chloride batteries. | 21th Jul 1921 | Box 49 \ 5 Scan308 | |
| The vibration test of a new standard Exide battery. | 12th Aug 1921 | Box 49 \ 5 Scan309 | |
| Battery vibration test, detailing the apparatus used and the condition of the elements after treatment. | 1st Aug 1921 | Box 49 \ 5 Scan310 | |
| Analysis of battery cell failures, comparing mechanical vibration with incorrect electrical treatment and testing procedures. | 12th Aug 1921 | Box 49 \ 5 Scan311 | |
| The testing and condition of battery cells after charging and overcharging experiments. | 12th May 1921 | Box 49 \ 5 Scan312 | |
| Report discussing the effects of overcharging and discharging on battery plates and detailing a vibration test on a modified cell. | 12th Aug 1931 | Box 49 \ 5 Scan313 | |
| Recurring issue of damaged batteries upon delivery to coachbuilders and the associated repair costs. | 17th Aug 1921 | Box 49 \ 5 Scan314 | |
| Letter regarding a cell failure in an experimental battery due to a missing separator. | 30th Aug 1921 | Box 49 \ 5 Scan315 | |
| Letter concerning a battery failure and discussing reliability and inspection processes. | 10th Dec 1926 | Box 49 \ 5 Scan316 | |
| Letter of apology regarding the omission of separators in experimental batteries. | 5th Sep 1921 | Box 49 \ 5 Scan317 | |
| Leakage of charge test report for a Chloride 6BXE5 12-volt battery. | 6th Sep 1921 | Box 49 \ 5 Scan318 | |
| Battery discharge capacity test to determine the cause of capacity reduction. | 6th Sep 1921 | Box 49 \ 5 Scan319 | |
| Instructions and results for leakage and charge tests conducted on a standard Chloride battery after six months. | 6th Sep 1921 | Box 49 \ 5 Scan320 | |
| Battery leakage tests, noting that surface leakage is negligible but internal leakage may be an issue. | 24th Jan 1919 | Box 49 \ 5 Scan321 | |
| Report detailing cell discharge rates and results in a tabular format. | 24th Jan 1919 | Box 49 \ 5 Scan322 | |
| Notification about the change in designation for the standard Chloride battery cell. | 23th Sep 1921 | Box 49 \ 5 Scan323 | |
| Arranging a conference to discuss faulty Exide batteries. | 6th Oct 1932 | Box 49 \ 5 Scan324 | |
| Graph chart recording a battery efficiency test. | 28th Jan 1922 | Box 49 \ 5 Scan325 | |
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