| Description | Date | Identifier | |
| Recommendation to lower the silencer on the 40/50 chassis by .500' to resolve clearance and drumming noise issues. | 1st Oct 1920 | Box 38 \ 4 Scan113 | |
| The issue of standardisation sheets for Wakefield Castrol 'R' Oil, a Whittle belt, and a silencer. | 4th Oct 1920 | Box 38 \ 4 Scan114 | |
| Lowering the silencer on a 40/50 HP chassis and correcting a clerical error. | 6th Oct 1920 | Box 38 \ 4 Scan115 | |
| Holding up a job for the standardisation of a chassis part and modification to a silencer. | 16th Oct 1920 | Box 38 \ 4 Scan116 | |
| Dropping the exhaust system by 0.5 inches on the 40/50 chassis. | 29th Nov 1920 | Box 38 \ 4 Scan117 | |
| Standardisation sheet for a front and rear silencer lowered by .500 inches. | 8th Nov 1920 | Box 38 \ 4 Scan118 | |
| Standardisation of chassis parts: lowering the front and rear silencer by .500 inches. | 4th Oct 1920 | Box 38 \ 4 Scan119 | |
| Recommendation to lower the silencer on the 40/50 chassis by .500' to resolve clearance and vibration issues. | 2nd Oct 1920 | Box 38 \ 4 Scan120 | |
| Note on lowering the silencer by .500 and ordering brackets for the old standard position. | 11th Oct 1920 | Box 38 \ 4 Scan121 | |
| Request for a list of exhaust connection and fitting parts to be cancelled or scrapped due to a silencer design change. | 13th Oct 1920 | Box 38 \ 4 Scan122 | |
| The cost of scrap material for 500 sets caused by chassis modifications. | 28th Oct 1920 | Box 38 \ 4 Scan123 | |
| Modification to lower the front and rear silencer, held up for scrap cost approval. | 4th Nov 1920 | Box 38 \ 4 Scan124 | |
| Customer issues with explosions in the silencer and enquiring about a potential standardized fix. | 29th Sep 1921 | Box 38 \ 4 Scan125 | |
| Main silencer unions on the 40/50 HP chassis, discussing copper asbestos washers and gun metal nuts. | 7th May 1924 | Box 38 \ 4 Scan126 | |
| Confirming details about C & A washers for main silencer unions on 40-50 HP models. | 5th May 1924 | Box 38 \ 4 Scan127 | |
| Rattles and exhaust blows from main silencer unions on 40-50 HP cars, suggesting material and design improvements. | 2nd May 1924 | Box 38 \ 4 Scan128 | |
| Swan neck connection for a rear silencer. | 1st Sep 1923 | Box 38 \ 4 Scan129 | |
| Recommending an increase in material gauge for the 40/50 HP car's silencer snout due to damage from explosions. | 3rd Jun 1924 | Box 38 \ 4 Scan130 | |
| Query regarding the extent to which car silencers become choked up and the methods for cleaning them. | 31th Dec 1924 | Box 38 \ 4 Scan131 | |
| Maintenance of silencers, noting they do not get choked except on old 30HP cars. | 2nd Jan 1925 | Box 38 \ 4 Scan132 | |
| To order 12-volt batteries and inquire about half-watt lamps. | 15th Nov 1918 | Box 38 \ 5 Scan001 | |
| The stock and ordering of 12-volt batteries for car lighting and starting. | 23th Nov 1918 | Box 38 \ 5 Scan002 | |
| Two experimental batteries of type LD11 from Messrs. Peto & Radford. | 25th Nov 1918 | Box 38 \ 5 Scan003 | |
| Letter from Peto & Radford Accumulator Co Ltd regarding a delayed response and their new focus on manufacturing car batteries. | 15th Jan 1919 | Box 38 \ 5 Scan004 | |
| Letter to Peto & Radford Accumulator Co. Ltd. regarding an order for accumulators. | 16th Jan 1919 | Box 38 \ 5 Scan005 | |
| The cancellation and amendment of an order for batteries. | 18th Jan 1919 | Box 38 \ 5 Scan006 | |
| Extract regarding the expected delivery of batteries from supplier Peto & Radford. | 5th Feb 1919 | Box 38 \ 5 Scan007 | |
| Extract concerning the expected delivery of two LD11 type batteries from Peto & Radford. | 18th Feb 1919 | Box 38 \ 5 Scan008 | |
| Of goods received for a 9-cell accumulator in a teak case. | 19th Feb 1919 | Box 38 \ 5 Scan009 | |
| Record of routine treatment for a car lighting and starting battery, detailing charging and discharging cycles. | 14th Mar 1919 | Box 38 \ 5 Scan010 | |
| Battery test report detailing the second charge, weight, and discharge performance. | 26th Apr 1917 | Box 38 \ 5 Scan011 | |
| Test log sheet detailing battery cell densities, charge cycles, and discharge performance. | 26th Apr 1917 | Box 38 \ 5 Scan012 | |
| Log sheet detailing cell densities and the fourth battery charge cycle with timings and ampere-hours. | 26th Apr 1917 | Box 38 \ 5 Scan013 | |
| Letter from Peto & Radford Accumulator Co Ltd following up on a sample celluloid accumulator sent for testing. | 27th Feb 1919 | Box 38 \ 5 Scan014 | |
| Letter to an accumulator company discussing the initial test results of a sample battery. | 1st Mar 1919 | Box 38 \ 5 Scan015 | |
| Letter from an accumulator manufacturer discussing celluloid battery specifications, features, and charging procedures. | 7th Mar 1919 | Box 38 \ 5 Scan016 | |
| Letter from Peto & Radford Ltd. enclosing an omitted instruction booklet for batteries. | 7th Mar 1919 | Box 38 \ 5 Scan017 | |
| Letter to Peto & Radford Accumulator Co. Ltd. discussing lighting and starting batteries. | 14th Mar 1919 | Box 38 \ 5 Scan018 | |
| Letter from an accumulator manufacturer discussing the supply and technical specifications of ebonite and celluloid batteries. | 15th Mar 1919 | Box 38 \ 5 Scan019 | |
| Letter to Messrs. Peto & Radford Ltd. clarifying the required specifications for lighting and starting batteries. | 17th Mar 1919 | Box 38 \ 5 Scan020 | |
| Letter from Peto & Radford Accumulator Co Ltd regarding the arrival of ebonite boxes for batteries. | 18th Mar 1919 | Box 38 \ 5 Scan021 | |
| List of good and bad points for a P. & R. Battery. | 21th Mar 1919 | Box 38 \ 5 Scan022 | |
| To Mr Clark regarding the receipt of an accumulator from Messrs Peto & Radford for experiment 3374. | 28th Mar 1919 | Box 38 \ 5 Scan023 | |
| Various sample batteries, with a detailed description and dimensions of a Chloride Battery. | 21th Mar 1919 | Box 38 \ 5 Scan024 | |
| The testing and specifications of a P. & R. celluloid battery, including performance data and dimensions. | 26th Apr 1917 | Box 38 \ 5 Scan025 | |
| The performance and construction of a car battery, including a sketch and details of a new Fuller Battery. | 28th Apr 1917 | Box 38 \ 5 Scan026 | |
| Letter from Peto & Radford Accumulator Co. regarding an ebonite battery and a proposed meeting. | 31th Mar 1919 | Box 38 \ 5 Scan027 | |
| Letter to Peto & Radford Accumulator Co.Ltd. regarding the receipt and testing of an ebonite battery and arranging a meeting. | 2nd Apr 1919 | Box 38 \ 5 Scan028 | |
| Letter from Peto & Radford Accumulator Co Ltd arranging a meeting to discuss a battery. | 3rd Apr 1919 | Box 38 \ 5 Scan029 | |
| Special discharge test of a P & R 6C P.D.L.9 type accumulator. | 7th Apr 1919 | Box 38 \ 5 Scan030 | |
| Letter from Peto & Radford Accumulator Co. Ltd. arranging a meeting to discuss accumulators. | 8th Apr 1919 | Box 38 \ 5 Scan031 | |
| The testing and performance of various lighting and starting batteries, with a particularly negative review of Fuller batteries. | 10th Apr 1919 | Box 38 \ 5 Scan032 | |
| The construction and arrangement of two types of six-cell ebonite batteries in teak boxes. | 10th Apr 1919 | Box 38 \ 5 Scan033 | |
| The weights, dimensions, and performance characteristics of Tudor and P. & R. batteries. | 10th Apr 1919 | Box 38 \ 5 Scan034 | |
| Battery design modifications to prevent acid spray, including a discussion with the supplier Peto & Radford. | 10th Apr 1919 | Box 38 \ 5 Scan035 | |
| Battery issues, specifically poor discharge capacity, and proposed solutions like changing the acid. | 10th Apr 1919 | Box 38 \ 5 Scan036 | |
| Letter from Peto & Radford Accumulator Co Ltd regarding the performance and charging of car accumulators. | 10th Apr 1919 | Box 38 \ 5 Scan037 | |
| Letter to Peto & Radford Accumulator Co. Ltd. regarding a new specification for a lighting and starting battery. | 12th Apr 1919 | Box 38 \ 5 Scan038 | |
| Letter from an accumulator manufacturer discussing battery charging, capacity tests, and cell construction options. | 15th Apr 1919 | Box 38 \ 5 Scan039 | |
| Letter from Peto & Radford Ltd. detailing capacity percentages at various discharge rates. | 18th Apr 1919 | Box 38 \ 5 Scan040 | |
| Routine treatment report for a car lighting and starting battery, detailing the first charge and discharge cycles. | 24th May 1919 | Box 38 \ 5 Scan041 | |
| Log sheet detailing the second charge, weight, cell densities, and discharge of a battery. | 8th Apr 1919 | Box 38 \ 5 Scan042 | |
| Test report detailing battery cell densities, charging, and discharging performance. | 25th Apr 1917 | Box 38 \ 5 Scan043 | |
| Log of battery cell densities and charging data. | 26th Apr 1917 | Box 38 \ 5 Scan044 | |
| Results of short-period battery tests, focusing on the heating of links. | 15th Apr 1919 | Box 38 \ 5 Scan045 | |
| Letter to Peto & Radford Accumulator Co. Ltd. discussing battery discharge tests, acid density, and modifications to battery specifications. | 23th Apr 1919 | Box 38 \ 5 Scan046 | |
| Page 2 of a letter discussing the low internal resistance of batteries and plotting a B.E.A.M.A. curve. | 25th Apr 1917 | Box 38 \ 5 Scan047 | |
| Letter from an accumulator manufacturer discussing discharge capacity tests, separate cell construction, and connection methods. | 25th Apr 1919 | Box 38 \ 5 Scan048 | |
| Letter from Peto & Radford Ltd. regarding the interchangeability of cells and terminals. | 25th Apr 1919 | Box 38 \ 5 Scan049 | |
| Extract report on the performance of P & R celluloid and ebonite batteries. | 2nd May 1919 | Box 38 \ 5 Scan050 | |
| Letter from Peto & Radford Accumulator Co. Ltd. regarding a 9 plate battery sample and an enclosed discharge curve. | 3rd May 1919 | Box 38 \ 5 Scan051 | |
| Strip chart recording from a test, showing a value decreasing over time. | 2nd Mar 1919 | Box 38 \ 5 Scan052 | |
| Correspondence with Peto & Radford Accum. Co., Ltd. regarding battery performance, capacity, and discharge rates. | 8th May 1919 | Box 38 \ 5 Scan053 | |
| Letter from an accumulator manufacturer regarding capacity issues and the production of a special sample. | 12th May 1919 | Box 38 \ 5 Scan054 | |
| Letter from an accumulator manufacturer discussing battery discharge rates, capacity, and specifications. | 14th May 1919 | Box 38 \ 5 Scan055 | |
| Table of results for S.S. motor battery tests. | 7th Jun 1919 | Box 38 \ 5 Scan056 | |
| Letter from an accumulator manufacturer regarding the dispatch of a new sample battery and its capacity curve. | 17th Jul 1919 | Box 38 \ 5 Scan057 | |
| Letter to Messrs. Peto & Radford, Ltd. acknowledging receipt of a sample chassis lighting and starting battery for testing. | 24th Jul 1919 | Box 38 \ 5 Scan058 | |
| Graph chart recording the amperage of a 'Peto & Radford' accumulator over time. | 1st Jul 1919 | Box 38 \ 5 Scan059 | |
| Form for recording the routine treatment of car lighting and starting batteries. | 29th Jul 1919 | Box 38 \ 5 Scan060 | |
| Battery test log detailing charge, weight, cell densities, and discharge performance. | 29th Apr 1919 | Box 38 \ 5 Scan061 | |
| Test report detailing battery cell densities, charge cycles, and discharge performance. | 29th Apr 1919 | Box 38 \ 5 Scan062 | |
| Test report detailing cell densities and fourth charge characteristics. | 6th Aug 1919 | Box 38 \ 5 Scan063 | |
| Letter from Peto & Radford Accumulator Co. Ltd. regarding a sample accumulator sent for testing. | 6th Aug 1919 | Box 38 \ 5 Scan064 | |
| Receipt and initial testing of a new Tudor battery for chassis lighting and starting. | 7th Aug 1919 | Box 38 \ 5 Scan065 | |
| The performance and specifications of P & R and Premier batteries. | 7th Aug 1919 | Box 38 \ 5 Scan066 | |
| The ampere-hour capacity and testing of batteries. | 7th Aug 1919 | Box 38 \ 5 Scan067 | |
| Second discharge test results for a P & R 60 E II component. | 15th Aug 1919 | Box 38 \ 5 Scan068 | |
| Letter detailing the results of low rate discharge tests on a battery sent by Messrs. Peto & Radford. | 20th Aug 1919 | Box 38 \ 5 Scan069 | |
| Letter from Peto & Radford Accumulator Co Ltd regarding a faulty battery and arranging an engineer's visit. | 22th Aug 1919 | Box 38 \ 5 Scan070 | |
| Test report on the discharge of P & R and Chloride batteries at a 10 amp rate. | 1st Oct 1919 | Box 38 \ 5 Scan071 | |
| The discharge of a P & R battery after a high-rate charge. | 4th Oct 1919 | Box 38 \ 5 Scan072 | |
| Letter from an accumulator manufacturer advising on charging methods to improve battery capacity. | 11th Sep 1918 | Box 38 \ 5 Scan073 | |
| Letter detailing the results of continuous and intermittent discharge tests on a sample chassis lighting and starting battery. | 12th May 1920 | Box 38 \ 5 Scan074 | |
| Continuation page of a report on battery performance tests, noting that the tested battery was below average. | 14th May 1920 | Box 38 \ 5 Scan075 | |
| List of various batteries with details on their cable connections. | 14th May 1920 | Box 38 \ 5 Scan076 | |
| The disappointing performance and short life of P & R batteries. | 18th May 1920 | Box 38 \ 5 Scan077 | |
| Letter from accumulator manufacturers Peto & Radford regarding a sample chassis lighting and starting battery. | 20th May 1920 | Box 38 \ 5 Scan078 | |
| Continuation of a letter from Peto & Radford discussing different types of batteries and separators. | 10th Jun 1920 | Box 38 \ 5 Scan079 | |
| Letter from Peto & Radford following up on an offer to supply a sample chassis lighting and starting battery for testing. | 10th Jun 1920 | Box 38 \ 5 Scan080 | |
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