| Description | Date | Identifier | |
| Letter to Messrs. Peto & Radford Ltd. confirming a visit to the works. | 14th Feb 1938 | Box 164 \ 3 img138 | |
| Conclusions on the battery and ignition system for the Wraith model. | 18th Feb 1938 | Box 164 \ 3 img139 | |
| Report page continuing the comparison of ignition coils and discussing engine starting torque. | 18th Feb 1938 | Box 164 \ 3 img140 | |
| Scheme detailing a modified rear battery mounting for the Wraith III model due to insufficient capacity. | 21th Feb 1938 | Box 164 \ 3 img141 | |
| Letter from a battery manufacturer discussing modifications for cold starting tests and new battery types. | 1st Mar 1938 | Box 164 \ 3 img142 | |
| Wrong-handed Lucas negative battery terminal on chassis 7.B.V. and the necessary modification. | 2nd Mar 1938 | Box 164 \ 3 img143 | |
| Letter from a battery supplier requesting to borrow a Delco 6 volt 15-T9 battery for testing to provide a suitable replacement. | 9th Mar 1938 | Box 164 \ 3 img144 | |
| Letter to Peto & Radford Ltd. regarding the loan of a 15.T.9 battery and a replacement offer. | 14th Mar 1938 | Box 164 \ 3 img145 | |
| Letter from accumulator manufacturers Peto & Radford regarding the loan and replacement of a battery. | 16th Mar 1938 | Box 164 \ 3 img146 | |
| Letter confirming the dispatch of a replacement Delco 15T type battery to Peto & Radford Ltd. | 22th Mar 1938 | Box 164 \ 3 img147 | |
| Dispatch of a Delco type 15T battery to Peto & Radford for testing in relation to an Oldsmobile. | 23th Mar 1938 | Box 164 \ 3 img148 | |
| Requesting the forwarding of a Delco car battery to Messrs Peto & Radford for testing. | 24th Mar 1938 | Box 164 \ 3 img149 | |
| Letter from Peto & Radford confirming receipt of a Delco 15-T9 battery, promising a full report in due course. | 29th Mar 1938 | Box 164 \ 3 img150 | |
| Suspected fault in a car's battery and a request for its removal for inspection. | 6th Apr 1938 | Box 164 \ 3 img151 | |
| Letter to Peto & Radford Ltd. regarding a Delco Battery report and the testing of a replacement. | 14th Apr 1938 | Box 164 \ 3 img152 | |
| Requesting an update on the status of a STXR9A battery supplied by Joseph Lucas Ltd which is on test. | 22th Apr 1938 | Box 164 \ 3 img153 | |
| Letter from accumulator manufacturers Peto & Radford regarding cold starting tests for batteries. | 29th Apr 1938 | Box 164 \ 3 img154 | |
| Letter to Peto & Radford Ltd. arranging a cold chamber test for two special 6-HZD11-G batteries. | 3rd May 1938 | Box 164 \ 3 img155 | |
| Letter from accumulator manufacturers Peto & Radford regarding the test report of a failed Delco battery and a proposed replacement. | 5th Apr 1938 | Box 164 \ 3 img156 | |
| Examination and comparison report on a Delco 15-T9 battery. | 5th Apr 1938 | Box 164 \ 3 img157 | |
| Report page comparing the construction and performance of two different batteries, specifically focusing on plate elements and capacity. | 5th May 1938 | Box 164 \ 3 img158 | |
| Letter from Peto & Radford regarding a visit and arrangements for tests to be carried out in a cold chamber. | 5th May 1938 | Box 164 \ 3 img159 | |
| Letter from Peto & Radford regarding the cold-weather testing of a 6-HZD11-G battery. | 9th May 1938 | Box 164 \ 3 img160 | |
| Graph showing the period of discharge at high rates for three different types of accumulators. | 2nd May 1938 | Box 164 \ 3 img161 | |
| Request to return charger No.1249 which was loaned from Partridge Wilson and Co.Ltd. for testing. | 11th May 1938 | Box 164 \ 3 img162 | |
| Covering letter for a duplicate report on the method of testing accumulators at low temperatures using a 'Cold Box' with Cardice. | 11th May 1938 | Box 164 \ 3 img163 | |
| Procedure for conducting low-temperature tests on accumulators using a lagged box with solid carbon dioxide. | 11th May 1938 | Box 164 \ 3 img164 | |
| Instructions for charging accumulators and sourcing solid carbon dioxide for testing. | 11th May 1938 | Box 164 \ 3 img165 | |
| Instructions on how to conduct a low-temperature test on a 12-volt starter accumulator using Cardice. | 13th May 1938 | Box 164 \ 3 img166 | |
| Letter to Peto & Radford Ltd. detailing the results of cold chamber battery tests. | 13th May 1938 | Box 164 \ 3 img167 | |
| The concluding page of a typed letter. | 13th May 1938 | Box 164 \ 3 img168 | |
| Letter from Peto & Radford regarding the results of cold chamber tests on their 6-HZD11-G batteries. | 16th May 1938 | Box 164 \ 3 img169 | |
| Requesting instructions for the removal of a special ebonite-lined battery box from car 22.G.V. for examination. | 23th May 1938 | Box 164 \ 3 img170 | |
| Particulars of a Lucas Dynamo and Battery from an S.S. Jaguar Car. | 24th May 1938 | Box 164 \ 3 img171 | |
| Invoice from Joseph Lucas Ltd for a battery that is currently being tested. | 27th May 1938 | Box 164 \ 3 img172 | |
| Request for particulars on various makes of accumulators. | 31th May 1938 | Box 164 \ 3 img173 | |
| Letter from Peto & Radford requesting a full report on bench tests for the special 6-HZD11-G batteries. | 3rd Jun 1938 | Box 164 \ 3 img174 | |
| Letter from The Young Accumulator Company quoting manufacturer's terms for car batteries and proposing a sales meeting. | 3rd Jun 1938 | Box 164 \ 3 img175 | |
| Test report on the suitability of a Lucas Type STXR9A battery, concluding it is inferior to others tested. | 8th Jun 1938 | Box 164 \ 3 img176 | |
| Comparison test report on Lucas and Exide batteries for Bentley and Wraith chassis. | 8th Jun 1938 | Box 164 \ 3 img177 | |
| Letter concerning the delay and revised schedule for experimental battery tests. | 10th Jun 1938 | Box 164 \ 3 img178 | |
| Battery discharge and life tests, comparing experimental and standard models. | 10th Jun 1938 | Box 164 \ 3 img179 | |
| The purchase of two 'eleven plate' Lucas 12TXW11 batteries for testing. | 10th Jun 1938 | Box 164 \ 3 img180 | |
| Agreeing to the proposal to test the 'eleven plate' Lucas battery and arranging to order two units. | 10th Jun 1938 | Box 164 \ 3 img181 | |
| Requesting the return of a Lucas STXR9A battery to its manufacturer after testing. | 11th Jun 1938 | Box 164 \ 3 img182 | |
| Letter to Lucas Ltd. detailing the results of a starting capability test on their STXR9A battery compared to an Exide battery. | 11th Jun 1938 | Box 164 \ 3 img183 | |
| Page 2 of a letter to Lucas Ltd. concerning the testing and recommendation of car batteries. | 11th Jun 1938 | Box 164 \ 3 img184 | |
| Battery failures due to over-tightening securing nuts, proposing a new design with a finger grip nut for immediate production. | 11th Aug 1938 | Box 164 \ 3 img185 | |
| Requesting the replacement of a corroded positive battery terminal lug. | 13th Jun 1938 | Box 164 \ 3 img186 | |
| Poor performance of a Lucas battery and ordering different models with wood separators for testing. | 22th Jun 1938 | Box 164 \ 3 img187 | |
| Issues with hand-smithed frames and a more economical battery support solution for B.3 & B.50 models. | 22th Jun 1938 | Box 164 \ 3 img188 | |
| Letter from accumulator manufacturer Peto & Radford concerning battery life testing methodologies. | 17th Jun 1938 | Box 164 \ 3 img189 | |
| And sketches regarding vehicle components including a dynamo, brakes, and a horn. | 26th Mar 1938 | Box 164 \ 3 img190 | |
| Battery discharge and charge rates, with a proposed testing cycle procedure. | 26th Mar 1938 | Box 164 \ 3 img191 | |
| The final page of a letter from Peto & Radford offering further information and a visit to Derby. | 5th Jul 1938 | Box 164 \ 3 img192 | |
| Letter detailing the results of comparative tests on four different car batteries. | 5th Jul 1938 | Box 164 \ 3 img193 | |
| Comparison of battery test results for Dagenite, Exide, and Lucas models. | 5th Jul 1938 | Box 164 \ 3 img194 | |
| Charging and discharging cycle for a 6HZD11.S battery for a life test. | 5th Jul 1938 | Box 164 \ 3 img195 | |
| Letter from accumulator manufacturer Peto & Radford regarding test results for a special 6-HZD11-G battery. | 7th Jul 1938 | Box 164 \ 3 img196 | |
| Modification notice concerning the battery box support bracket for Bentley 50 and 111 chassis. | 10th May 1938 | Box 164 \ 3 img197 | |
| Damaged Exide battery from a Wraith engine test bed, requesting its return to the makers for repair. | 11th Jul 1938 | Box 164 \ 3 img198 | |
| Request to forward a dropped and cracked battery, which is leaking acid, to the Exide Co. for repair. | 12th Jul 1938 | Box 164 \ 3 img199 | |
| Letter from an accumulator manufacturer regarding battery testing procedures and comparative results. | 22th Jul 1938 | Box 164 \ 3 img200 | |
| Letter from Peto & Radford regarding battery testing procedures and despatch arrangements. | 22th Jul 1938 | Box 164 \ 3 img201 | |
| Letter from Peto & Radford regarding the dispatch of a Dagenite 6-GLK11 battery for testing. | 5th Aug 1938 | Box 164 \ 3 img202 | |
| Letter comparing the test results of Dagenite and Lucas batteries. | 8th Aug 1938 | Box 164 \ 3 img203 | |
| Letter discussing the test results of a Dagenite battery and the potential visit of a Mr. Chapman. | 8th Sep 1938 | Box 164 \ 3 img204 | |
| Letter from an accumulator manufacturer following up on a battery sent for testing and proposing a visit to discuss special tests for bulk supplies. | 23th Aug 1938 | Box 164 \ 3 img205 | |
| Preliminary test results of a Dagenite GLK.11.S battery. | 27th Aug 1938 | Box 164 \ 3 img206 | |
| Inquiry for details and pricing on ampere-hour meters for experimental battery charging. | 1st Sep 1938 | Box 164 \ 3 img207 | |
| Letter from the British Sangamo Company providing leaflets and pricing for Time Switches and DC amperehour Meters. | 8th Sep 1938 | Box 164 \ 3 img208 | |
| Product specification sheet for a British Sangamo Type N.F. Direct Current Ampere-Hour Meter. | 1st Aug 1934 | Box 164 \ 3 img209 | |
| Product sheet for a British Sangamo Direct Current Ampere-Hour Meter, Type N.T. Vehicle Pattern. | 1st May 1938 | Box 164 \ 3 img210 | |
| Product specification sheet for direct current ampere-hour meters, types NT & NF. | 1st May 1938 | Box 164 \ 3 img211 | |
| Cross-section diagram of a Mercury Motor Element for direct current ampere-hour meters. | 1st May 1938 | Box 164 \ 3 img212 | |
| The front cover of a general catalogue for products from the British Sangamo Company Ltd. | 1st May 1938 | Box 164 \ 3 img213 | |
| From the British Sangamo Company outlining their conditions of sale, including clauses for an extended guarantee and fair wages. | 1st May 1938 | Box 164 \ 3 img214 | |
| Promotional material for the Type SS Sangamo Time Switch. | 1st May 1938 | Box 164 \ 3 img215 | |
| Advertisement for the Sangamo Type SS Time Switch. | 1st May 1938 | Box 164 \ 3 img216 | |
| Specification sheet for a switch with various operational features, dials, and safety mechanisms. | 1st May 1938 | Box 164 \ 3 img217 | |
| Product specification sheet for various types of switches, including dimensions and list prices, from the British Sangamo Company Ltd. | 8th Sep 1938 | Box 164 \ 3 img218 | |
| Letter from the Young Accumulator Company proposing a meeting to discuss their facilities. | 8th Sep 1938 | Box 164 \ 3 img219 | |
| Letter from Peto & Radford discussing comparative test reports for the 6-GLK11-S Dagenite battery. | 12th Sep 1938 | Box 164 \ 3 img220 | |
| Letter to The British Sangamo Co. Ltd. discussing the suitability of their ampere-hour meter for experimental battery charging. | 15th Sep 1938 | Box 164 \ 3 img221 | |
| Letter requesting a quotation for a suitable instrument. | 15th Sep 1938 | Box 164 \ 3 img222 | |
| Letter from Sangamo Weston Ltd. acknowledging receipt of correspondence. | 17th Sep 1938 | Box 164 \ 3 img223 | |
| Letter from British Sangamo Company Ltd. regarding the supply and specification of amperehour meters. | 19th Sep 1938 | Box 164 \ 3 img224 | |
| Letter from British Sangamo Co. Ltd. regarding a contact for an auxiliary circuit and an enclosed quotation for meters. | 19th Sep 1938 | Box 164 \ 3 img225 | |
| Quotation letter from British Sangamo Company Ltd. in response to an enquiry. | 19th Sep 1938 | Box 164 \ 3 img226 | |
| Specification and quote for a 10 ampere battery pattern ampere-hour meter. | 19th Sep 1938 | Box 164 \ 3 img227 | |
| The conditions of sale for a tender, specifically focusing on an extended guarantee and fair wages clauses. | 19th Sep 1938 | Box 164 \ 3 img228 | |
| Proposal letter to Bentley Motors regarding non-corrosive washers. | 19th Sep 1938 | Box 164 \ 3 img229 | |
| Customer letter from Dearborn, Michigan requesting agent details for reordering washers. | 19th Sep 1938 | Box 164 \ 3 img230 | |
| Counter display card advertising a non-corrosive battery washer designed to prevent power loss and save money. | 19th Sep 1938 | Box 164 \ 3 img231 | |
| Instructions and guarantee for using Non-Corrosive Washers to prevent battery corrosion and sulphation. | 19th Sep 1938 | Box 164 \ 3 img232 | |
| Promotional flyer for non-corrosive battery terminal washers. | 19th Sep 1938 | Box 164 \ 3 img233 | |
| Promotional leaflet for Non-Corrosive Washers designed to prevent battery corrosion. | 22th Sep 1938 | Box 164 \ 3 img234 | |
| Requesting the purchase of an ampere-hour meter for the chassis electrical laboratory for battery life tests. | 22th Sep 1938 | Box 164 \ 3 img235 | |
| Requesting a sketch for a simpler battery support, criticising the continued use of battery boxes. | 23th Sep 1938 | Box 164 \ 3 img236 | |
| Request for the factory cost of a Bentley III battery box with two different coating options. | 29th Sep 1938 | Box 164 \ 3 img237 | |
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