| Description | Date | Identifier | |
| Experimental log sheet tracking mileage for a P+R BOH II-7 battery. | 1st Jul 1929 | Box 168b \ 3 img211 | |
| Electrical experimental record sheet tracking mileage and remarks for a battery test. | 1st May 1929 | Box 168b \ 3 img212 | |
| Electrical experimental record sheet for a battery, tracking mileage and usage dates. | 17th Jul 1929 | Box 168b \ 3 img213 | |
| Electrical experimental record sheet for a P&R BDHH-10 Battery, tracking mileage over several months. | 17th Jul 1929 | Box 168b \ 3 img214 | |
| Electrical experimental record sheet for a battery, tracking its usage, status, and mileage between 1928 and 1929. | 1st Jul 1929 | Box 168b \ 3 img215 | |
| Electrical experimental and road test log sheet tracking mileage for a P4RBDHIN1L battery. | 1st Jul 1929 | Box 168b \ 3 img216 | |
| Electrical experimental record sheet for battery no. 206. | 1st Jul 1929 | Box 168b \ 3 img217 | |
| Electrical experimental record sheet for a battery, tracking its location, dates, and remarks. | 1st Jul 1929 | Box 168b \ 3 img218 | |
| Letter to supplier Peto & Radford regarding recurring failures in 40/50 HP battery cells. | 2nd Jul 1929 | Box 168b \ 3 img219 | |
| Letter from supplier Peto & Radford regarding difficulty fulfilling an order for a new single-cell accumulator. | 8th Jul 1929 | Box 168b \ 3 img220 | |
| Letter to Messrs. Peto & Radford regarding a request for a sample cell and compartment mouldings. | 8th Jul 1929 | Box 168b \ 3 img221 | |
| Letter from Peto & Radford regarding the dispatch of a three-compartment battery for examination. | 15th Jul 1929 | Box 168b \ 3 img222 | |
| Test report on the performance and condition of a two-year-old battery. | 23th Jul 1929 | Box 168b \ 3 img223 | |
| Letter to Messrs. Peto & Radford providing feedback on a sample three-compartment moulded container and cell. | 6th Sep 1929 | Box 168b \ 3 img224 | |
| Inspection of one-piece three-compartment moulded battery containers from Exide and Peto & Radford Cos. | 7th Sep 1929 | Box 168b \ 3 img225 | |
| Letter from accumulator manufacturers Peto & Radford regarding suggestions for improvements to their latest batteries. | 9th Sep 1929 | Box 168b \ 3 img226 | |
| Arrangement to examine a pair of up-to-date grids used in a standard RRN11 battery. | 26th Sep 1929 | Box 168b \ 3 img227 | |
| Request for two brass tools, with a half-section sketch, for assembling battery lugs to lids on P & R 6-volt unit batteries. | 26th Sep 1929 | Box 168b \ 3 img228 | |
| Requesting the order of two different 6-volt batteries with specific modifications for comparative testing. | 26th Sep 1929 | Box 168b \ 3 img229 | |
| Letter from Peto & Radford regarding sending samples of unpasted grids for a new battery. | 1st Oct 1929 | Box 168b \ 3 img230 | |
| Inspection and return of a sample 6-volt P & R unit battery case and cell. | 1st Oct 1929 | Box 168b \ 3 img231 | |
| Corrosion issues with P&R RRNII batteries and a request to order ebonite collars. | 12th Oct 1929 | Box 168b \ 3 img232 | |
| Suggestions for preventing corrosion on terminal posts by using different materials and design modifications. | 12th Oct 1929 | Box 168b \ 3 img233 | |
| Proposal with a sketch for a design modification to prevent acid getting on terminals. | 15th Oct 1929 | Box 168b \ 3 img234 | |
| Letter to a battery supplier regarding corrosion on terminals caused by the omission of petroleum jelly. | 15th Oct 1929 | Box 168b \ 3 img235 | |
| Letter to Messrs. Peto & Radford suggesting design improvements to prevent corrosion, including a sketch. | 15th Oct 1929 | Box 168b \ 3 img236 | |
| Examination of sample grids for P4RRRNII batteries, with a sketch of the vertical rib. | 17th Oct 1929 | Box 168b \ 3 img237 | |
| Technical note on the design improvements of battery grids, specifically the horizontal bars and pitch. | 16th Oct 1929 | Box 168b \ 3 img238 | |
| Invoice from Peto & Radford for ebonite collars for batteries. | 16th Oct 1929 | Box 168b \ 3 img239 | |
| Letter to Messrs. Peto & Radford requesting instructions on how to fit ebonite rings. | 22th Oct 1929 | Box 168b \ 3 img240 | |
| Letter from a battery manufacturer discussing design alterations and missing parts for accumulators. | 26th Oct 1929 | Box 168b \ 3 img241 | |
| Letter from Peto & Radford regarding cell lid design and recommending solid lead inter-cell connectors to prevent corrosion. | 31th Oct 1929 | Box 168b \ 3 img242 | |
| Adoption of burnt up connections versus standard bolted connections for P & R Standard Phantom R.R. N11 batteries. | 31th Oct 1929 | Box 168b \ 3 img243 | |
| Request to order thicker antimonial lead terminal washers for P & R 40/50 HP batteries. | 31th Oct 1929 | Box 168b \ 3 img244 | |
| Letter to Messrs. Peto & Radford Ltd. regarding ebonite collars, terminals, and cell connections. | 1st Nov 1929 | Box 168b \ 3 img245 | |
| Cell connections, detailing why flexible connections are necessary due to the different thermal expansion rates of ebonite and lead. | 4th Nov 1929 | Box 168b \ 3 img246 | |
| Letter to Messrs. Peto & Radford discussing battery cell connection types for a Phantom model. | 18th Nov 1929 | Box 168b \ 3 img247 | |
| Letter from Peto & Radford regarding a drawing for an antimonial lead terminal washer. | 29th Nov 1929 | Box 168b \ 3 img248 | |
| Blueprint for a Lead Terminal Washer for 3.RRN.11. | 2nd Dec 1929 | Box 168b \ 3 img249 | |
| Letter to Messrs. Peto & Radford confirming a washer design is satisfactory for the 3.RRN.11 battery. | 2nd Dec 1929 | Box 168b \ 3 img250 | |
| Letter from supplier Peto & Radford confirming approval of drawing SK. 4791 for Antimonial Lead Washers. | 4th Dec 1929 | Box 168b \ 3 img251 | |
| Comparison of modifications between P & R and Exide N.S.I. 6-volt unit cell batteries. | 3rd Jan 1930 | Box 168b \ 3 img252 | |
| Letter to Peto & Radford regarding the testing of a new vent for a 6-volt Phantom II battery unit. | 31th Jan 1930 | Box 168b \ 3 img253 | |
| Letter to a supplier proposing a modification to the handle slots on 6-volt batteries for the Phantom II chassis. | 27th Jan 1930 | Box 168b \ 3 img254 | |
| Letter to Messrs. Peto & Radford regarding the fitment of batteries on two experimental cars. | 27th Jan 1930 | Box 168b \ 3 img255 | |
| The satisfactory initial status of a new type P&R moulded vent plug, with plans for a 10,000-mile test. | 30th Jan 1930 | Box 168b \ 3 img256 | |
| Of points from Mr. Minchin concerning 6-volt units, Phantom connections, battery vents, and 20 HP battery arrangement. | 1st Feb 1930 | Box 168b \ 3 img257 | |
| Requesting the return of a faulty P & R B.D.H.11 6-volt battery to the makers for repair. | 30th Jan 1930 | Box 168b \ 3 img258 | |
| Letter to Messrs. Peto & Radford regarding a suggested design alteration to a cell lid and to formalise objections. | 4th Feb 1930 | Box 168b \ 3 img259 | |
| Letter discussing burnt up versus bolted battery connections for the Phantom II chassis. | 4th Feb 1930 | Box 168b \ 3 img260 | |
| Letter concerning the design and manufacture of moulded battery containers for the Phantom II chassis. | 5th Feb 1930 | Box 168b \ 3 img261 | |
| Letter from Peto & Radford regarding a 10,000-mile test on a vent. | 5th Feb 1930 | Box 168b \ 3 img262 | |
| Concerns regarding acid spray and thread wear from remoulded Dagenite vent plugs during a 10,000-mile test. | 7th Feb 1930 | Box 168b \ 3 img263 | |
| Letter discussing modifications and potential corrosion issues for Phantom II batteries. | 7th Feb 1930 | Box 168b \ 3 img264 | |
| Note discussing the compromise between a brass thread and a wholly lead insert. | 10th Feb 1930 | Box 168b \ 3 img265 | |
| Letter from accumulator manufacturer Peto & Radford regarding objections to a proposed cell lid design modification. | 10th Feb 1930 | Box 168b \ 3 img266 | |
| Letter from Peto & Radford regarding the modification of accumulator assemblies for interchangeability. | 12th Feb 1930 | Box 168b \ 3 img267 | |
| Severe battery terminal corrosion on trials car 2-WJ, positing lack of ventilation as the cause. | 15th Feb 1930 | Box 168b \ 3 img268 | |
| Letter to The National Accumulator Co. Ltd. regarding battery specifications for the Phantom II chassis. | 20th Feb 1930 | Box 168b \ 3 img269 | |
| Suggestion to examine and replace lead coated brass washers on Peto & Radford Batteries for the Phantom II Chassis. | 22th Feb 1930 | Box 168b \ 3 img270 | |
| Complaint regarding corrosion on P & R battery terminals on a Phantom II chassis and the proposed rectification. | 22th Feb 1930 | Box 168b \ 3 img271 | |
| Correspondence from National Accumulator Company regarding the hold on a special 20 HP battery and a future order for a 6-volt unit. | 28th Feb 1920 | Box 168b \ 3 img272 | |
| Tenth report of the Design Committee discussing frame jellying, rear axle failure, and battery recharging capacity. | 5th Mar 1930 | Box 168b \ 3 img273 | |
| Electrical experimental record sheet tracking mileage of a battery component. | 19th Apr 1926 | Box 168b \ 3 img274 | |
| Electrical experimental record sheet tracking the mileage and testing of a P.R.B.D.H.U.1/3 battery. | 19th Apr 1926 | Box 168b \ 3 img275 | |
| Cracked 6-volt P & R batteries, concluding the cause was an incorrectly sized wedge, not a material defect. | 11th Mar 1930 | Box 168b \ 3 img276 | |
| Electrical experimental record sheet for a battery, tracking usage and mileage over time. | 14th Mar 1930 | Box 168b \ 3 img277 | |
| Electrical experimental record sheet tracking component usage and mileage from 1928 to 1930. | 14th Mar 1930 | Box 168b \ 3 img278 | |
| Covering letter returning papers and a maker's report on batteries for a Phantom II chassis. | 18th Mar 1930 | Box 168b \ 3 img279 | |
| Received P & R battery unit with burnt up connections for a 6-Volt Phantom II. | 20th Mar 1930 | Box 168b \ 3 img280 | |
| Test report on a P&R RRNII battery, detailing charge and discharge characteristics after road use. | 21th Mar 1930 | Box 168b \ 3 img281 | |
| Battery performance and test readings after a road run. | 21th Sep 1920 | Box 168b \ 3 img282 | |
| Test results for a R2-6RR11-1 battery, detailing mileage, bench life, and discharge performance. | 16th May 1930 | Box 168b \ 3 img283 | |
| Battery tests, detailing a fault, its cause, and a suggested modification. | 21th Jun 1930 | Box 168b \ 3 img284 | |
| The low and high rate discharge tests of a faulty electrical cell. | 3rd Jun 1930 | Box 168b \ 3 img285 | |
| Letter from accumulator manufacturer Peto & Radford proposing modifications to the design of battery grids and plates to reduce charging voltage. | 3rd Jun 1930 | Box 168b \ 3 img286 | |
| Request to examine a fractured tube that carries the battery from Mr. Royce's car. | 4th Jun 1930 | Box 168b \ 3 img287 | |
| Letter postponing a visit to discuss the design and testing of an improved battery plate grid. | 16th Jul 1930 | Box 168b \ 3 img288 | |
| Letter to Messrs. Peto & Radford regarding experiments with charging voltages and generator output. | 16th Jun 1930 | Box 168b \ 3 img289 | |
| Letter to Mr. C.C.F. Pritchett of Messrs. Pritchett & Gold and E.P.S. Co.Ltd. | 18th Jul 1930 | Box 168b \ 3 img290 | |
| Letter from an accumulator manufacturer regarding a modification to a plate design to lower charging voltage, proposing a meeting. | 23th Jun 1930 | Box 168b \ 3 img291 | |
| Letter to Messrs. Peto & Radford arranging a meeting with Mr. Fowler Clark. | 24th Jun 1930 | Box 168b \ 3 img292 | |
| Letter from Peto & Radford explaining a delay in a meeting about battery design due to staff unavailability. | 25th Jun 1930 | Box 168b \ 3 img293 | |
| Letter to Messrs. Peto & Radford postponing a proposed interview. | 25th Jun 1930 | Box 168b \ 3 img294 | |
| Extract from C.W. Hancock's report on battery and fittings performance on car 24-EX at 6,000 miles. | 20th Jul 1930 | Box 168b \ 3 img295 | |
| Requesting the outcome of a discussion regarding the reduction of charging voltage for batteries. | 28th Aug 1930 | Box 168b \ 3 img296 | |
| Short internal memorandum confirming that an interview has not yet taken place but will be arranged. | 6th Aug 1930 | Box 168b \ 3 img297 | |
| Extract from a report detailing the battery and fittings for a revised battery box to suit a cantilever suspension. | 18th Jun 1930 | Box 168b \ 3 img298 | |
| Log sheet detailing the testing and handling of battery part number 219. | 25th Aug 1930 | Box 168b \ 3 img299 | |
| Log sheet tracking the service history and mileage for a specific battery part. | 25th Aug 1930 | Box 168b \ 3 img300 | |
| Letter from Peto & Radford regarding issues with battery voltages and dual ignition systems. | 25th Sep 1930 | Box 168b \ 3 img301 | |
| Letter from accumulator manufacturer Peto & Radford concerning tests on new battery grid designs and arranging a meeting. | 1st Oct 1930 | Box 168b \ 3 img302 | |
| Letter to Mr. Pritchett arranging a visit to Dagenham Dock and requesting travel directions. | 6th Oct 1930 | Box 168b \ 3 img303 | |
| Letter from accumulator manufacturers Peto & Radford to E. Fowler-Clark, apologising for a delayed response and arranging a meeting. | 9th Oct 1930 | Box 168b \ 3 img304 | |
| Letter from Peto & Radford confirming a discussion about a modified 3-RRN11 battery design and a forthcoming sample. | 27th Oct 1930 | Box 168b \ 3 img305 | |
| Letter to a supplier regarding an order for modified Phantom II batteries and reporting on successful tests of a new vent plug. | 29th Oct 1930 | Box 168b \ 3 img306 | |
| Letter to Messrs. Peto & Radford concerning moulded battery containers for the 20/25 model. | 29th Oct 1930 | Box 168b \ 3 img307 | |
| Standardisation report for a moulded Dagenite vent plug for Phantom II batteries. | 31th Oct 1930 | Box 168b \ 3 img308 | |
| Letter from accumulator manufacturer Peto & Radford, regarding a sample 3-RRN11 battery being sent for testing. | 11th Nov 1930 | Box 168b \ 3 img309 | |
| Standardisation of the P & R moulded vent plug for two battery types. | 25th Nov 1930 | Box 168b \ 3 img310 | |
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