| Description | Date | Identifier | |
| Supply and effectiveness of side rubber buffers for Phantom II scuttle isolation. | 10th Jan 1931 | Box 53 \ 4 Scan249 | |
| Use of extra side rubbers for scuttle isolation on 25 HP cars. | 1st Dec 1930 | Box 53 \ 4 Scan250 | |
| Quoting Peto & Radford Company regarding a delay with the new type 40/50 battery. | 16th Jan 1924 | Box 54 \ 1 Scan001 | |
| Revised specification and extra costs for 12-volt starting batteries for the 20 HP chassis. | 30th Jan 1924 | Box 54 \ 1 Scan002 | |
| Arranging a meeting with Peto & Radford to discuss outstanding details on the 40/50 HP battery. | 21th Feb 1924 | Box 54 \ 1 Scan003 | |
| Letter from Peto & Radford discussing battery capacity and weight specifications for 20 HP and 40/50 chassis. | 5th Feb 1924 | Box 54 \ 1 Scan004 | |
| Quoting a letter from Peto & Radford regarding the non-standard battery terminals on the 40/50 HP Chassis. | 20th Feb 1924 | Box 54 \ 1 Scan005 | |
| Visit from Mr. Minchin and the supply of batteries and terminals for the 40/50 HP Chassis. | 22th Feb 1924 | Box 54 \ 1 Scan006 | |
| Letter quoting Peto & Radford regarding the new 40/50 HP chassis batteries and their delivery schedule. | 29th Feb 1924 | Box 54 \ 1 Scan007 | |
| Battery dimensions and label placement for a 40/50 HP Chassis. | 14th Mar 1924 | Box 54 \ 1 Scan008 | |
| Arranging visits from battery suppliers, The Chloride Electrical Storage Co. Ltd. and Peto & Radford. | 27th Mar 1924 | Box 54 \ 1 Scan009 | |
| Letter from Peto & Radford confirming modifications to grids and proceeding with their manufacture. | 11th Apr 1924 | Box 54 \ 1 Scan010 | |
| Letter to Messrs. Peto & Radford approving two sample R.R. grids. | 12th Apr 1924 | Box 54 \ 1 Scan011 | |
| Form for recording the routine treatment of car lighting and starting batteries. | 8th Jul 1924 | Box 54 \ 1 Scan012 | |
| Battery test log sheet detailing charge, density, weight, and temperature measurements. | 8th Jul 1924 | Box 54 \ 1 Scan013 | |
| Log sheet recording results from a series of battery charging and performance tests. | 2nd Apr 1925 | Box 54 \ 1 Scan014 | |
| Letter from Peto & Radford detailing the comparative test results of an Accu-Slem cell against an R.R.11 cell. | 2nd Apr 1925 | Box 54 \ 1 Scan015 | |
| Report from Peto & Radford comparing the condition of R.R.11 and Accu-Slem battery components. | 6th Apr 1925 | Box 54 \ 1 Scan016 | |
| Correspondence concerning the sealing of Peto & Radford batteries to prevent acid spillage. | 6th Apr 1925 | Box 54 \ 1 Scan017 | |
| Letter confirming the requirement for Peto & Radford 40/50 batteries to be completely sealed over the top of the cells. | 7th Apr 1925 | Box 54 \ 1 Scan018 | |
| Ordering specific battery cells to create a composite or 'sandwich' battery for a comparison experiment. | 23th Apr 1925 | Box 54 \ 1 Scan019 | |
| Procurement and specifications for an experimental Exide battery. | 5th Jun 1925 | Box 54 \ 1 Scan020 | |
| Diagrams showing different configurations for 40/50 Sandwich Batteries. | 17th Jun 1925 | Box 54 \ 1 Scan021 | |
| Requesting confirmation on a special 6RR5 Exide battery to avoid unnecessary experimental work, and also mentions two Peto & Radford cells received in error. | 27th Jun 1925 | Box 54 \ 1 Scan022 | |
| The failure analysis of a P & R RR.11/1 battery after 28,476 miles. | 8th Jul 1925 | Box 54 \ 1 Scan023 | |
| Standardising and updating the battery capacity figures in the instruction book for the new 40/50 chassis. | 19th Aug 1925 | Box 54 \ 1 Scan024 | |
| Letter to Messrs. Peto & Radford concerning the failure of a new 40/50 type P & R RR.11 battery. | 10th Sep 1925 | Box 54 \ 1 Scan025 | |
| Electrical experimental record sheet for a P&R BR11/1 Battery (147). | 12th Jun 1924 | Box 54 \ 1 Scan026 | |
| Letter from a battery supplier regarding issues with swollen plates in their product. | 15th Sep 1925 | Box 54 \ 1 Scan027 | |
| Letter from Peto & Radford regarding the performance and life test of an R.R.11 battery. | 18th Sep 1925 | Box 54 \ 1 Scan028 | |
| Letter to Messrs. Peto & Radford concerning testing and maintenance procedures for an RR.11 battery. | 21th Sep 1925 | Box 54 \ 1 Scan029 | |
| Letter concerning the dispatch of two cells and information about P & R chassis batteries. | 26th Sep 1925 | Box 54 \ 1 Scan030 | |
| The return of two Peto & Radford battery cells for inspection. | 26th Sep 1925 | Box 54 \ 1 Scan031 | |
| Letter to Messrs. Peto & Radford concerning the performance and examination of a P & R. RR.11 battery. | 30th Sep 1925 | Box 54 \ 1 Scan032 | |
| Instruction sheet detailing a special test on two P&R RRII battery cells. | 30th Sep 1925 | Box 54 \ 1 Scan033 | |
| Instruction note regarding a satisfactory method for treating batteries intended for dry storage. | 1st Oct 1925 | Box 54 \ 1 Scan034 | |
| Letter from Peto & Radford concerning the performance and mileage of a returned 'RR.11' battery. | 1st Oct 1925 | Box 54 \ 1 Scan035 | |
| Letter discussing battery mileage equivalency and requesting a further supply of oil for FA.11 cells. | 2nd Oct 1925 | Box 54 \ 1 Scan036 | |
| Acknowledgement of receipt for improved porcelain containers and elements for H.T. batteries. | 5th Oct 1925 | Box 54 \ 1 Scan037 | |
| Letter from Peto & Radford concerning battery discharging and draining instructions. | 5th Oct 1925 | Box 54 \ 1 Scan038 | |
| Letter from an accumulator manufacturer concerning battery life and supplying oil for cells. | 6th Oct 1925 | Box 54 \ 1 Scan039 | |
| Letter to Mr. G.R.N. Minchin discussing ignition performance, dynamo output limits, and battery configurations. | 21th Nov 1925 | Box 54 \ 1 Scan040 | |
| Comparison of the charging internal resistance and voltage between P & R and Exide batteries. | 21th Nov 1925 | Box 54 \ 1 Scan041 | |
| Battery internal resistance, charging characteristics, and their impact on dynamo performance. | 21th Nov 1925 | Box 54 \ 1 Scan042 | |
| Performance of car batteries, comparing different types and proposing changes to charging specifications. | 21th Nov 1925 | Box 54 \ 1 Scan043 | |
| Letter discussing criticisms and performance issues of H.T. batteries. | 23th Nov 1925 | Box 54 \ 1 Scan044 | |
| Letter from an accumulator manufacturer discussing ignition, dynamo output, and battery over-charging issues on Phantom cars. | 23th Nov 1925 | Box 54 \ 1 Scan045 | |
| Letter from Peto & Radford discussing car battery performance, charging rates, and over-charging issues. | 23th Nov 1925 | Box 54 \ 1 Scan046 | |
| Continuation page of a letter to E. Fowler Clark Esq., regarding grooves on separators. | 23th Nov 1925 | Box 54 \ 1 Scan047 | |
| Letter to Mr. G.R.N. Minchin discussing battery charging rates, peak outputs and enclosed performance curves. | 24th Nov 1925 | Box 54 \ 1 Scan048 | |
| Dynamo output curves and premature battery failures, particularly Exide batteries, due to over-charging. | 24th Nov 1925 | Box 54 \ 1 Scan049 | |
| Battery failures and charging system characteristics on the New Phantom model. | 24th Nov 1925 | Box 54 \ 1 Scan050 | |
| Continued letter discussing dynamo output under experimental conditions and arranging for a machine exchange for testing purposes. | 24th Nov 1925 | Box 54 \ 1 Scan051 | |
| Letter discussing dynamo testing, battery charging capabilities, and separator arrangements in Exide and P&R batteries. | 24th Nov 1925 | Box 54 \ 1 Scan052 | |
| Continued report on the performance and construction of different battery cells. | 27th Nov 1925 | Box 54 \ 1 Scan053 | |
| Letter from accumulator manufacturer Peto & Radford clarifying issues regarding battery overcharging and premature failures. | 27th Nov 1925 | Box 54 \ 1 Scan054 | |
| Letter discussing the performance and over-charging issues of car batteries and dynamos. | 27th Nov 1925 | Box 54 \ 1 Scan055 | |
| Letter discussing battery separators, internal resistance, dynamo charging peaks, and output curves for 20 HP and 40/50 models. | 27th Nov 1925 | Box 54 \ 1 Scan056 | |
| Letter from Peto & Radford discussing battery charging currents and the potential for over or undercharging. | 27th Nov 1925 | Box 54 \ 1 Scan057 | |
| Letter from Peto & Radford regarding a controversy over batteries and electrical equipment discussed in 'Autocar' magazine. | 30th Nov 1925 | Box 54 \ 1 Scan058 | |
| Typed letter to the editor of 'The Autocar' regarding battery overcharging in British cars and the benefits of dynamos with a falling output. | 30th Nov 1925 | Box 54 \ 1 Scan059 | |
| Typed letter to the editor of 'The Autocar' magazine praising the firm's leading design. | 30th Nov 1925 | Box 54 \ 1 Scan060 | |
| Letter discussing the internal appearance and longevity of car batteries based on different care and charging conditions. | 2nd Dec 1925 | Box 54 \ 1 Scan061 | |
| Continued discussion on vehicle battery life, overcharging, and dynamo performance on the New Phantom. | 2nd Dec 1925 | Box 54 \ 1 Scan062 | |
| Report comparing the performance of Exide and P&R batteries with a dynamo, detailing voltage, amperage, and temperature results. | 2nd Dec 1925 | Box 54 \ 1 Scan063 | |
| The charging systems and batteries for the 20 HP and 40/50 HP models, including undercharging complaints. | 2nd Dec 1925 | Box 54 \ 1 Scan064 | |
| Letter discussing a communication with Autocar and a postscript on battery performance and materials. | 2nd Dec 1925 | Box 54 \ 1 Scan065 | |
| Report compiling feedback from different individuals on dynamo and battery charging issues for 20 HP and Phantom models. | 2nd Dec 1925 | Box 54 \ 1 Scan066 | |
| Battery charging difficulties for different car models based on typical usage patterns. | 2nd Dec 1925 | Box 54 \ 1 Scan067 | |
| Continued discussion on battery life, repairs, renewals, and potential overcharging. | 2nd Dec 1925 | Box 54 \ 1 Scan068 | |
| The order of a P & R RR.11 (40/50) battery for the Electrical Experimental Department. | 2nd Dec 1925 | Box 54 \ 1 Scan069 | |
| Test data table showing battery cell voltages and dynamo performance metrics. | 3rd Dec 1925 | Box 54 \ 1 Scan070 | |
| Letter from an accumulator manufacturer discussing battery wear, sludge formation, and longevity. | 8th Dec 1925 | Box 54 \ 1 Scan071 | |
| Letter from Peto & Radford discussing battery performance, output curves, and proposed modifications for Phantom cars. | 8th Dec 1925 | Box 54 \ 1 Scan072 | |
| Letter to Mr. Minchin discussing battery overcharging, sludge, and the condition of plates. | 9th Dec 1925 | Box 54 \ 1 Scan073 | |
| Lead-acid battery plate chemistry, construction, and maintenance. | 9th Dec 1925 | Box 54 \ 1 Scan074 | |
| Letter discussing electrical output adjustments on New Phantom chassis and battery maintenance. | 11th Dec 1925 | Box 54 \ 1 Scan075 | |
| Letter from a battery supplier discussing overcharging issues and arranging a visit. | 11th Dec 1925 | Box 54 \ 1 Scan076 | |
| The continuation of a letter from Peto & Radford to E. Fowler Clark Esq. | 11th Dec 1925 | Box 54 \ 1 Scan077 | |
| Test results of terminal potential differences on a standard D&R battery during charging at various amperages. | 11th Jan 1926 | Box 54 \ 1 Scan078 | |
| Instruction sheet detailing the results of bench tests on a P&R RR11-2 battery. | 1st Jan 1926 | Box 54 \ 1 Scan079 | |
| Letter inquiring about the differences and proposed alterations to P & R batteries, focusing on charging resistance. | 12th Jan 1926 | Box 54 \ 1 Scan080 | |
| Continuation of a letter regarding sandwiching experiments with different types of batteries. | 11th Dec 1925 | Box 54 \ 1 Scan081 | |
| Letter from a battery manufacturer regarding standard batteries for cars. | 19th Jan 1926 | Box 54 \ 1 Scan082 | |
| Letter from Pritchett & Gold and E.P.S. Co. Ltd. concerning details of the 40/50 battery and characteristics of Exide and P. & R. batteries. | 19th Jan 1926 | Box 54 \ 1 Scan083 | |
| Testing the terminal potential difference and electromotive force of a P & R 6FR11 battery cell. | 30th Jan 1926 | Box 54 \ 1 Scan084 | |
| Letter from Peto & Radford discussing modifications to battery plates and experiments with ebonite and wood separators. | 2nd Feb 1926 | Box 54 \ 1 Scan085 | |
| Letter discussing the performance of different ebonite and wood separators to improve high discharge performance. | 4th Feb 1926 | Box 54 \ 1 Scan086 | |
| Test results for terminal potential differences of standard P&R batteries during charging at different currents. | 4th Feb 1926 | Box 54 \ 1 Scan087 | |
| Letter to Mr. K. Preston of Peto & Radford regarding battery specifications and charging procedures. | 6th Feb 1926 | Box 54 \ 1 Scan088 | |
| Instructions and results for a P4RRRII-2 battery discharge test. | 10th Feb 1926 | Box 54 \ 1 Scan089 | |
| The performance results of a component's second discharge test. | 22th Feb 1926 | Box 54 \ 1 Scan090 | |
| Letter discussing a compromise on the thickness of ebonite separators and their effect on resistance and charging. | 22th Feb 1926 | Box 54 \ 1 Scan091 | |
| Page 2 of a letter discussing a .5mm compromise with Exide and specifications for wood separators. | 25th Feb 1926 | Box 54 \ 1 Scan092 | |
| Instructions for a leakage test on a standard P&R RRII cell. | 25th Feb 1926 | Box 54 \ 1 Scan093 | |
| Instruction sheet noting that the standard cell is not subject to leakage like the Tungstone cell. | 8th Dec 1924 | Box 54 \ 1 Scan094 | |
| Letter from an accumulator manufacturer discussing ebonite separator thickness and battery performance. | 1st Apr 1926 | Box 54 \ 1 Scan095 | |
| Letter from Peto & Radford to E. Fowler Clark Esq. regarding issues with battery plates swelling and breaking. | 1st Apr 1926 | Box 54 \ 1 Scan096 | |
| Letter from Peto & Radford concerning the performance and testing of their battery cells against Exide batteries. | 15th Apr 1926 | Box 54 \ 1 Scan097 | |
| Letter discussing experimental battery comparisons and specifications for separators and electrolyte levels. | 16th Apr 1926 | Box 54 \ 1 Scan098 | |
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