| Description | Date | Identifier | |
| Continued discussion on positive plate disintegration in batteries, suggesting improvements to separator placement. | 5th Jan 1926 | Box 54 \ 5 Scan044 | |
| Letter discussing the use of threaded rubber separators for batteries instead of wood and ebonite. | 11th Jan 1926 | Box 54 \ 5 Scan045 | |
| Threaded rubber separators for batteries and arranging a meeting. | 12th Jan 1926 | Box 54 \ 5 Scan046 | |
| Threaded rubber separators for batteries and correspondence with suppliers. | 14th Jan 1926 | Box 54 \ 5 Scan047 | |
| Letter from Peto and Radford discussing the supply and technical issues of threaded rubber separators for accumulators. | 13th Jan 1926 | Box 54 \ 5 Scan048 | |
| Typed letter from PETO AND RADFORD discussing the supply and configuration of accumulators. | 13th Jan 1926 | Box 54 \ 5 Scan049 | |
| Potential disadvantages of using threaded rubber separators in batteries. | 15th Jan 1926 | Box 54 \ 5 Scan050 | |
| Battery design, performance, and material degradation, with a focus on P&R batteries. | 15th Jan 1926 | Box 54 \ 5 Scan051 | |
| Internal memorandum concerning threaded rubber separators for batteries. | 21th Jan 1926 | Box 54 \ 5 Scan052 | |
| Supply and specifications of threaded rubber separators for batteries. | 27th Jan 1926 | Box 54 \ 5 Scan053 | |
| Letter from The Chloride Electrical Storage Co. Ltd. confirming the supply of a standard battery for a 40/50 chassis. | 26th Jan 1926 | Box 54 \ 5 Scan054 | |
| Letter discussing the orientation of threaded rubber separators within battery cells. | 29th Jan 1926 | Box 54 \ 5 Scan055 | |
| Letter from Peto & Radford discussing the properties and testing of threaded rubber separators. | 28th Jan 1926 | Box 54 \ 5 Scan056 | |
| Experiment on the arrangement of threaded rubber separators within batteries. | 1st Feb 1926 | Box 54 \ 5 Scan057 | |
| Letter from a battery manufacturer detailing modifications to the active material in plates and separators. | 2nd Feb 1926 | Box 54 \ 5 Scan058 | |
| Letter from Pritchett & Gold and E.P.S. Co. Ltd. discussing battery separator performance experiments. | 2nd Feb 1926 | Box 54 \ 5 Scan059 | |
| Letter to Mr. K. Preston of Peto & Radford regarding battery modifications, specifically ebonite thickness and separators. | 6th Feb 1926 | Box 54 \ 5 Scan060 | |
| Marking system for threaded rubber separators in an experimental battery. | 10th Feb 1926 | Box 54 \ 5 Scan061 | |
| Letter from a battery manufacturer discussing modifications to reduce charging potential difference. | 11th Feb 1926 | Box 54 \ 5 Scan062 | |
| Letter from accumulator manufacturers Peto & Radford regarding progress on R.R.11 cells. | 12th Feb 1926 | Box 54 \ 5 Scan063 | |
| Letter discussing a proposal to change ebonite thickness and the decision to revert to a .4 mm specification. | 15th Feb 1926 | Box 54 \ 5 Scan064 | |
| Postscript discussing the reduction of ebonite thickness and its effect on internal resistance. | 15th Feb 1926 | Box 54 \ 5 Scan065 | |
| Letter from a battery manufacturer discussing the performance of different ebonite and wood separator combinations. | 17th Feb 1926 | Box 54 \ 5 Scan066 | |
| Letter discussing battery performance improvements and material specifications. | 17th Feb 1926 | Box 54 \ 5 Scan067 | |
| Letter discussing a compromise on the thickness of ebonite separators. | 22th Feb 1926 | Box 54 \ 5 Scan068 | |
| Letter discussing a .5mm dimensional compromise and the ribbing of wood separators with the company Exide. | 22th Feb 1926 | Box 54 \ 5 Scan069 | |
| Appropriate thickness for Ebonite separators in Peto & Radford batteries. | 22th Feb 1926 | Box 54 \ 5 Scan070 | |
| Querying a decision on the thickness of ebonite battery separators following correspondence with a supplier. | 23th Feb 1926 | Box 54 \ 5 Scan071 | |
| Routine treatment of a car lighting and starting battery, including charge and discharge data. | 3rd Mar 1926 | Box 54 \ 5 Scan072 | |
| Log of battery charging and testing, detailing a second charge, density readings, weight, and cell densities. | 16th Mar 1926 | Box 54 \ 5 Scan073 | |
| Test report on battery performance, detailing charging cycles, cell densities and ampere-hours. | 30th Mar 1926 | Box 54 \ 5 Scan074 | |
| Letter from Peto & Radford regarding a 'separation matter' and arranging a conference. | 5th Mar 1926 | Box 54 \ 5 Scan075 | |
| Extract from a letter from Messrs. Peto & Radford. | 15th Mar 1926 | Box 54 \ 5 Scan076 | |
| Letter to Mr. G.R.N. Minchin of Messrs. Peto & Radford regarding the specifications of battery ebonite separators. | 16th Mar 1926 | Box 54 \ 5 Scan077 | |
| Letter from accumulator manufacturers Peto & Radford regarding the thickness and design of battery separators for 40/50 HP cars. | 18th Mar 1926 | Box 54 \ 5 Scan078 | |
| Letter from Peto & Radford to E. Fowler Clark regarding altering wood separators in a cell. | 18th Mar 1926 | Box 54 \ 5 Scan079 | |
| Letter to a supplier regarding the incorrect thickness of ebonite battery separators. | 19th Mar 1926 | Box 54 \ 5 Scan080 | |
| Letter concerning the thickness specifications of ebonite battery separators and arranging an inspection. | 20th Mar 1926 | Box 54 \ 5 Scan081 | |
| Letter concerning the performance and thickness of ebonite separators in car batteries. | 30th Mar 1926 | Box 54 \ 5 Scan082 | |
| Letter from Peto & Radford discussing proposed modifications to battery separators. | 15th Apr 1926 | Box 54 \ 5 Scan083 | |
| Continuation of a letter from Peto & Radford discussing cell separation. | 15th Apr 1926 | Box 54 \ 5 Scan084 | |
| Letter to Mr. G.R.N. Minchin discussing battery comparisons, a battery in Commander Briggs' car, and the design of separators regarding electrolyte levels. | 16th Apr 1926 | Box 54 \ 5 Scan085 | |
| Letter discussing electrolyte depth, ebonite separation thickness, and issues with a Phantom's side lamps. | 22th Apr 1926 | Box 54 \ 5 Scan086 | |
| Letter from a battery manufacturer discussing the specifications of ebonite separators in batteries. | 22th Apr 1926 | Box 54 \ 5 Scan087 | |
| Letter clarifying that a recurring issue with side lamps was due to faulty bulbs, not the car's electrical system. | 22th Apr 1926 | Box 54 \ 5 Scan088 | |
| From ROY to EFC regarding the status of separators for Peto & Radford batteries. | 28th Apr 1926 | Box 54 \ 5 Scan089 | |
| Correct thickness of ebonite separators for P & R and Exide batteries. | 29th Apr 1926 | Box 54 \ 5 Scan090 | |
| Graph comparing battery cell performance showing 150 AMP discharge at a constant load on RRII. | 29th Apr 1926 | Box 54 \ 5 Scan091 | |
| Graph showing voltage drop over time during a 150 Amp discharge at a constant load on an RR11 battery. | 27th May 1926 | Box 54 \ 5 Scan092 | |
| Confirming the dispatch of a battery with threaded rubber separators for testing. | 27th May 1926 | Box 54 \ 5 Scan093 | |
| Experiments on Phantom batteries, focusing on variations in grids and threaded rubber separators. | 28th May 1926 | Box 54 \ 5 Scan094 | |
| Faulty Exide battery that has leaked acid, suspecting blocked vents as the cause. | 31th May 1926 | Box 54 \ 5 Scan095 | |
| Correspondence regarding defective Exide battery vent stoppers and their replacement by the Chloride Electrical Storage Co. Ltd. | 7th Jun 1926 | Box 54 \ 5 Scan096 | |
| Requesting cells for comparative testing of P & R and Exide batteries with new threaded rubber separators. | 8th Jun 1926 | Box 54 \ 5 Scan097 | |
| Delay in acquiring three standard battery cells to wait for an improved version. | 10th Jun 1926 | Box 54 \ 5 Scan098 | |
| Letter from a battery supplier regarding voltage rise characteristics and the supply of test cells. | 17th Jun 1926 | Box 54 \ 5 Scan099 | |
| Letter to Peto & Radford concerning experiments on battery charging and cell configuration. | 18th Jun 1926 | Box 54 \ 5 Scan100 | |
| Extract from Messrs. Peto & Radford regarding the supply and testing of four special cells. | 19th Jun 1926 | Box 54 \ 5 Scan101 | |
| Experimental 40/50 sandwich batteries containing cells with threaded rubber separators. | 26th Jun 1926 | Box 54 \ 5 Scan102 | |
| Letter to Mr. G.R.N. Minchin regarding a smaller output dynamo and the condition of four received cells. | 9th Jul 1926 | Box 54 \ 5 Scan103 | |
| Letter regarding the spillage of acid from batteries during transit and the packaging methods used. | 12th Jul 1926 | Box 54 \ 5 Scan104 | |
| Electrical experimental record sheet for a P & R TR II Battery, detailing tests and observations. | 2nd Jun 1926 | Box 54 \ 5 Scan105 | |
| Letter discussing battery cells for chassis 7-EX and other battery-related queries. | 10th Dec 1926 | Box 54 \ 5 Scan106 | |
| Extract of a letter from Messrs. Peto & Radford regarding the battery on Mr. Royce's chassis 7-EX. | 11th Dec 1926 | Box 54 \ 5 Scan107 | |
| Letter from Peto & Radford discussing battery test results and design improvements. | 12th Feb 1927 | Box 54 \ 5 Scan108 | |
| The re-testing of an SR battery, detailing low and high rate discharge tests. | 4th Apr 1927 | Box 54 \ 5 Scan109 | |
| Instructions sheet detailing the results of a Cadmium test on threaded rubber separators and standard cells. | 8th Dec 1924 | Box 54 \ 5 Scan110 | |
| Instruction sheet detailing the results of tests performed on an ST.13 battery. | 27th Apr 1927 | Box 54 \ 5 Scan111 | |
| Instruction note detailing the results of a cadmium test on battery cells fitted with threaded rubber separators. | 1st Dec 1924 | Box 54 \ 5 Scan112 | |
| Internal instruction to the Experimental Department regarding the receipt of a 12-volt battery from a chassis. | 11th Jan 1928 | Box 54 \ 5 Scan113 | |
| Instruction sheet detailing the results of tests on an SS battery. | 20th Aug 1928 | Box 54 \ 5 Scan114 | |
| Instructions and results for tests conducted on an ST Battery (181) after 20,000 miles. | 29th Aug 1928 | Box 54 \ 5 Scan115 | |
| The re-testing of an SR Battery after a 2-year life test. | 22th Nov 1928 | Box 54 \ 5 Scan116 | |
| Instructions for a low-rate discharge bench test on an SR battery. | 26th Nov 1928 | Box 54 \ 5 Scan117 | |
| Test report on an SS Battery (180), detailing low and high rate discharge results. | 15th Jul 1929 | Box 54 \ 5 Scan118 | |
| Test report on an ST Battery, detailing its mileage, age, and performance under various discharge rates. | 18th Jul 1929 | Box 54 \ 5 Scan119 | |
| Comparing P+R Standard and Exide threaded rubber battery separators. | 19th Jul 1929 | Box 54 \ 5 Scan120 | |
| The failure analysis of an Exide cell from an SS Battery. | 19th Jul 1929 | Box 54 \ 5 Scan121 | |
| Agreed-upon thickness for Ebonite separators. | 26th Sep 1929 | Box 54 \ 5 Scan122 | |
| Letter to supplier Peto & Radford Ltd. agreeing on the thickness specifications for ebonite battery separators. | 26th Sep 1929 | Box 54 \ 5 Scan123 | |
| Analysis of a P&R threaded rubber battery cell failure after extensive road and bench testing. | 12th Nov 1929 | Box 54 \ 5 Scan124 | |
| The failure analysis of battery plates and separators. | 18th Dec 1929 | Box 54 \ 5 Scan125 | |
| Analysis of battery cell failures in SS & ST type batteries following road and bench life testing. | 18th Dec 1929 | Box 54 \ 5 Scan126 | |
| The failure of battery plates due to sulphation, treeing, and a resulting short circuit. | 18th Dec 1929 | Box 54 \ 5 Scan127 | |
| Inspection report on the condition of battery cell number 6, detailing the plates and separators. | 18th Dec 1929 | Box 54 \ 5 Scan128 | |
| Analysis and comparison of battery cell components, specifically separators. | 18th Dec 1929 | Box 54 \ 5 Scan129 | |
| Analysis of battery cell component issues, including plate distortion and separator impurities. | 2nd May 1930 | Box 54 \ 5 Scan130 | |
| Test report on an SS Battery (180) detailing its mileage, life test duration, and discharge performance. | 2nd May 1930 | Box 54 \ 5 Scan131 | |
| The bench life tests of an S.T. battery (181). | 13th May 1930 | Box 54 \ 5 Scan132 | |
| Electrical experimental record sheet for ST Battery (181) tests. | 25th Aug 1928 | Box 54 \ 5 Scan133 | |
| Experimental record sheet for an ST Battery, detailing test dates, locations, remarks, and mileage. | 9th Sep 1930 | Box 54 \ 5 Scan134 | |
| Electrical experimental record sheet for an SS Battery test. | 9th Sep 1930 | Box 54 \ 5 Scan135 | |
| Experimental record sheet tracking the testing and performance of an SR Battery (179). | 5th Jan 1929 | Box 54 \ 5 Scan136 | |
| Electrical experimental record sheet tracking battery mileage and test results. | 9th Sep 1930 | Box 54 \ 5 Scan137 | |
| Tests completed on threaded rubber type separators for accumulators. | 29th Jan 1921 | Box 54 \ 5 Scan138 | |
| Analysis of battery failure modes, including plate buckling, electrolyte levels, and separator experiments. | 29th Jan 1921 | Box 54 \ 5 Scan139 | |
| Analysis of issues with battery cell separators, comparing standard wood and ebonite with Threaded Rubber. | 1st Feb 1921 | Box 54 \ 5 Scan140 | |
| Ignition options for the Goshawk I engine. | 1st Feb 1921 | Box 54 \ 5 Scan141 | |
| Proposal to fit a temporary battery ignition system to the Goshawk I engine by replacing the magneto. | 21th Jan 1921 | Box 54 \ 5 Scan142 | |
| Addition of a terminal to a Bosch 'ZF6' Magneto for the 'Goshawk I' engine to enable temporary dual ignition. | 16th Feb 1921 | Box 54 \ 5 Scan143 | |
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