| Description | Date | Identifier | |
| Confirming the use of Elliott ammeters for 40/50 HP and 20 HP chassis, and for future P.2 series orders. | 12th Dec 1927 | Box 168 \ 5 img125 | |
| Query regarding the potential damage to an ammeter from being overloaded by two Smith cigar lighters. | 18th Jan 1928 | Box 168 \ 5 img126 | |
| From EFC to Roy regarding a faulty Weston ammeter from an experimental car to be returned for repair. | 26th Jan 1928 | Box 168 \ 5 img127 | |
| Required overload specifications for a chassis ammeter, specifically its ability to withstand 90 amperes. | 25th Jan 1928 | Box 168 \ 5 img128 | |
| The defects and free-of-charge repair of a model 301 Ammeter returned to Weston Electrical Instrument Co. Ltd. | 3rd Feb 1928 | Box 168 \ 5 img129 | |
| Quoting correspondence from Ferranti Limited regarding the supply of a dashboard ammeter. | 23th Jul 1928 | Box 168 \ 5 img130 | |
| Low-reading Elliott ammeter on a 20 HP chassis, proposing to test stock ammeters for a replacement. | 25th Jul 1928 | Box 168 \ 5 img131 | |
| Faulty Ferranti Ammeter that needs returning to the maker due to a sticking needle. | 26th Jul 1928 | Box 168 \ 5 img132 | |
| Letter from Ferranti Ltd regarding the testing of a Dashboard Ammeter with a reported sticking needle. | 1st Aug 1928 | Box 168 \ 5 img133 | |
| Instructions to add an insulation test to the specification for a standard chassis ammeter, type MR no 155254. | 10th Aug 1928 | Box 168 \ 5 img134 | |
| Faulty Elliott ammeter that requires returning for rectification. | 14th Aug 1928 | Box 168 \ 5 img135 | |
| Return of an unsatisfactory Elliott Ammeter for rectification. | 16th Aug 1928 | Box 168 \ 5 img136 | |
| Letter to Ferranti Ltd. regarding a faulty dashboard ammeter with a sticking needle. | 18th Aug 1928 | Box 168 \ 5 img137 | |
| Letter from supplier Elliott Brothers regarding a damaged ammeter returned for inspection. | 21th Aug 1928 | Box 168 \ 5 img138 | |
| Letter from Ferranti Ltd. concerning tests on dashboard ammeters for sticktion. | 22th Aug 1928 | Box 168 \ 5 img139 | |
| The decision not to have an Elliott Ammeter repaired. | 27th Aug 1928 | Box 168 \ 5 img140 | |
| The test progress for a Ferranti ammeter instrument for a chassis. | 4th Sep 1928 | Box 168 \ 5 img141 | |
| Following up on a sticking Ferranti chassis ammeter that has been returned but not yet received back. | 5th Sep 1928 | Box 168 \ 5 img142 | |
| Instruction sheet detailing the test results for a viscometer instrument. | 21th Sep 1928 | Box 168 \ 5 img143 | |
| Requesting the installation of a tested Ferranti chassis type ammeter on vehicle 9-EX. | 22th Sep 1928 | Box 168 \ 5 img144 | |
| Letter from Ferranti Ltd. following up on the test results for a submitted dashboard instrument. | 15th Nov 1928 | Box 168 \ 5 img145 | |
| Instructions regarding a car test, noting mileage and referencing a previous report. | 19th Nov 1928 | Box 168 \ 5 img146 | |
| Brief report on the testing of a Ferranti Ammeter on an experimental car. | 20th Nov 1928 | Box 168 \ 5 img147 | |
| Requesting arrangements for a Weston ammeter to be returned to the makers for repair. | 19th Dec 1928 | Box 168 \ 5 img148 | |
| Performance review of Park Royal and Ferranti ammeters on experimental cars. | 13th Feb 1929 | Box 168 \ 5 img149 | |
| Faulty Weston ammeter being returned to the makers for correction. | 12th Mar 1929 | Box 168 \ 5 img150 | |
| Instructions detailing a successful electrical load test on a chassis lighting switch and ammeter. | 20th Mar 1917 | Box 168 \ 5 img151 | |
| Note regarding ammeter overload testing. | 28th Mar 1929 | Box 168 \ 5 img152 | |
| White metal bearing. | 5th Jan 1921 | Box 168 \ 5 img153 | |
| Request to exchange a Ferranti ammeter between chassis 9-X and 12-X to accumulate more mileage. | 1st Jul 1929 | Box 168 \ 5 img154 | |
| Damaged Ferranti ammeter to be returned to the makers for repair and potential improvement. | 11th Jul 1929 | Box 168 \ 5 img155 | |
| Recommendation to procure six Ferranti chassis ammeters for comparison against existing instruments. | 9th Sep 1929 | Box 168 \ 5 img156 | |
| Chasing the repair status of an experimental Ferranti Ammeter. | 8th Sep 1929 | Box 168 \ 5 img157 | |
| Test report on a repaired Ferranti Ammeter and its suitability for car 14.G.I. | 1st Oct 1929 | Box 168 \ 5 img158 | |
| Fitting of a repaired Ferranti ammeter to experimental chassis 14-G4. | 1st Oct 1929 | Box 168 \ 5 img159 | |
| The overload testing of a standard Elliott Ammeter with a 30SWG fuse. | 9th Oct 1929 | Box 168 \ 5 img160 | |
| Page two of a test report on an ammeter's resilience to a short circuit when protected by a fuse. | 31th Oct 1929 | Box 168 \ 5 img161 | |
| Notice about the fitting of a Ferranti ammeter to 14-G4. | 31th Oct 1929 | Box 168 \ 5 img162 | |
| Elliott Ammeters and the grouped instrument board assembly. | 2nd Nov 1929 | Box 168 \ 5 img163 | |
| Dust contamination issues during instrument board assembly, specifically affecting the Elliott ammeter. | 8th Nov 1929 | Box 168 \ 5 img164 | |
| Continued discussion on rectifying faulty instruments and determining responsibility. | 14th Nov 1929 | Box 168 \ 5 img165 | |
| Confirming the satisfactory arrangement for the assembly of instruments, referencing earlier memos. | 14th Nov 1929 | Box 168 \ 5 img166 | |
| Testing and procuring Park Royal Co. chassis ammeters. | 27th Nov 1929 | Box 168 \ 5 img167 | |
| The testing and comparison of Ferranti and Park Royal chassis ammeters. | 31th Jan 1929 | Box 168 \ 5 img168 | |
| Quotation for six sample Ferranti chassis ammeters. | 12th Dec 1929 | Box 168 \ 5 img169 | |
| Letter from Ferranti Ltd. to Mr. Fowler Clark regarding dashboard instruments and an order for Chokes and Resistances. | 7th Dec 1929 | Box 168 \ 5 img170 | |
| Letter to Ferranti Ltd. regarding the performance and construction of dashboard ammeters. | 10th Dec 1929 | Box 168 \ 5 img171 | |
| Letter from Ferranti Ltd regarding complaints of sticking instruments due to foreign matter in the magnet gap. | 11th Dec 1929 | Box 168 \ 5 img172 | |
| Specification for the production inspection and testing of a chassis ammeter. | 3rd Jan 1930 | Box 168 \ 5 img173 | |
| The testing and suggested improvements for Ferranti Ammeters Type B.S.I. | 13th Feb 1930 | Box 168 \ 5 img174 | |
| Test report on the satisfactory performance of five instruments regarding damping, accuracy, and overload. | 14th Feb 1930 | Box 168 \ 5 img175 | |
| Letter to Ferranti Ltd. providing feedback on the design, finish, and performance of sample chassis ammeters. | 14th Feb 1930 | Box 168 \ 5 img176 | |
| Instruction to fit a Ferranti ammeter type B.S.1 to a 20 HP chassis 12-CIV. | 4th Feb 1930 | Box 168 \ 5 img177 | |
| Replacement of Ferranti ammeters on chassis 14-EX and 17-G4. | 8th Feb 1930 | Box 168 \ 5 img178 | |
| Letter from Ferranti Ltd. regarding a query about the shape of ammeter pointers. | 18th Feb 1930 | Box 168 \ 5 img179 | |
| Letter from Ferranti Ltd. confirming design modifications to five sample instruments based on feedback. | 19th Feb 1930 | Box 168 \ 5 img180 | |
| Extract from Mr. Hancock's report on 14-GIV after 14,000 miles. | 5th Apr 1930 | Box 168 \ 5 img181 | |
| Instruction to fit a Ferranti ammeter No.32356 to experimental chassis 16-C4. | 8th Apr 1930 | Box 168 \ 5 img182 | |
| The mileage recorded by Ferranti and Park Royal ammeters on various car chassis. | 2nd Jun 1930 | Box 168 \ 5 img183 | |
| Standardization of either the Ferranti or Park Royal ammeter. | 4th Jun 1930 | Box 168 \ 5 img184 | |
| Recommending Ferranti over Park Royal as the supplier for Ammeters, based on their technical, commercial, and financial standing. | 28th Jun 1930 | Box 168 \ 5 img185 | |
| Notification of a Ferranti ammeter allotted for chassis 18-GIV. | 23th Jun 1930 | Box 168 \ 5 img186 | |
| Standardisation proposal to approve the Ferranti ammeter as an alternative British-sourced part to the existing Elliott ammeter. | 25th Jun 1930 | Box 168 \ 5 img187 | |
| The comparative testing and subsequent standardisation of Ferranti ammeters. | 1st Jul 1930 | Box 168 \ 5 img188 | |
| Standardisation of ammeters for the 40/50 HP and 20/25 HP chassis. | 1st Jul 1930 | Box 168 \ 5 img189 | |
| Ordering Ferranti ammeters as an alternative to Elliott instruments, and clarifying their specifications. | 17th Jul 1930 | Box 168 \ 5 img190 | |
| Note on the ordering and specification of Ferranti Ammeters, including details on finishes, covers, and types. | 19th Jul 1930 | Box 168 \ 5 img191 | |
| The standardization of Ferranti Ammeters following test results. | 22th Jul 1930 | Box 168 \ 5 img192 | |
| Log sheet for a Ferranti Ammeter tracking its usage, condition, and mileage from 1928 to 1930. | 2nd Sep 1930 | Box 168 \ 5 img193 | |
| Standardization of ammeters for left-hand drive chassis. | 2nd Sep 1930 | Box 168 \ 5 img194 | |
| Request for the inspection and readjustment of a faulty cut-out and ammeter from vehicle 25-EX. | 27th Sep 1930 | Box 168 \ 5 img195 | |
| Cancellation of a previous instruction and new instructions for fitting a Ferranti ammeter. | 29th Sep 1930 | Box 168 \ 5 img196 | |
| Supply status of Ferranti ammeters for F Benti matters. | 31th Oct 1930 | Box 168 \ 5 img197 | |
| The disposal of Elliott ammeters. | 20th Nov 1930 | Box 168 \ 5 img198 | |
| Request for information on Elliott Ammeters that are scheduled for disposal. | 20th Nov 1930 | Box 168 \ 5 img199 | |
| Requesting the disposal of several Elliott ammeters. | 21th Nov 1930 | Box 168 \ 5 img200 | |
| Collection, credit, and disposal arrangements for several Elliott ammeters. | 2nd Dec 1930 | Box 168 \ 5 img201 | |
| Instruction to refit a Ferranti ammeter from chassis 19-EX to 18-EX and return the existing Park Royal instrument. | 1st Dec 1930 | Box 168 \ 5 img202 | |
| Mileage and test log for a Ferranti Ammeter, model 32352 Type B.S.I. | 2nd Jan 1931 | Box 168 \ 5 img203 | |
| Test record log for Ferranti Ammeter no. 32353 Type B.S.I. | 5th Jan 1931 | Box 168 \ 5 img204 | |
| Test and usage log for Ferranti Ammeter no 32354, Type BSI. | 13th Feb 1930 | Box 168 \ 5 img205 | |
| Service and mileage record sheet for a Ferranti Simplexer, number 32355. | 6th Jan 1931 | Box 168 \ 5 img206 | |
| Experimental record sheet for a Ferranti Ammeter, number 32356, type B.S.1. | 1st Dec 1930 | Box 168 \ 5 img207 | |
| Chasing a response regarding the disposal of Park Royal and Elliott ammeters. | 8th Jan 1931 | Box 168 \ 5 img208 | |
| The inspection of Elliott Ammeters against a blueprint, noting discrepancies and required new cases. | 20th Jan 1931 | Box 168 \ 5 img209 | |
| Differences between two specific Elliott Ammeters (Nos. 153012 & 164148) and the standard drawing F.75652/5. | 1st Feb 1931 | Box 168 \ 5 img210 | |
| Requesting instructions for the disposal of two Elliott Ammeters. | 9th Mar 1931 | Box 168 \ 5 img211 | |
| Proposing to use a cheaper moving iron type ammeter instead of the current moving coil type for cost reduction. | 30th May 1931 | Box 168 \ 5 img212 | |
| Request to approach Messrs. Ferranti to submit a moving iron chassis ammeter for testing. | 6th Jun 1931 | Box 168 \ 5 img213 | |
| Suggesting making enquiries with an alternative supplier for a polarised moving iron chassis ammeter. | 6th Jul 1931 | Box 168 \ 5 img214 | |
| Inquiry to Ferranti's regarding the production of a polarised moving iron chassis ammeter. | 20th Aug 1931 | Box 168 \ 5 img215 | |
| Use of a more robust and less expensive moving iron type ammeter for the chassis instrument board. | 14th Oct 1931 | Box 168 \ 5 img216 | |
| Agreement to obtain a moving iron type of ammeter for the instrument board. | 20th Oct 1931 | Box 168 \ 5 img217 | |
| Request to source an ammeter with an inverted sketch for the 20/25 HP and Phantom II chassis. | 20th Oct 1931 | Box 168 \ 5 img218 | |
| Alteration of Ferranti ammeters for inverted mounting. | 23th Oct 1931 | Box 168 \ 5 img219 | |
| Specification for the inspection and testing of a chassis ammeter. | 28th Oct 1931 | Box 168 \ 5 img220 | |
| On the practice of replacing ammeters with control warning lamps on chassis electrical systems by Continental manufacturers. | 1st Nov 1931 | Box 168 \ 5 img221 | |
| Suitable ammeters and self-winding clocks for cars, recommending against Lucas and in favour of Weston, Elliott, or Ferranti ammeters and Boyce clocks. | 28th Nov 1931 | Box 168 \ 5 img222 | |
| Inquiry to the Weston Electric Instrument Co. about a moving iron ammeter. | 30th Nov 1931 | Box 168 \ 5 img223 | |
| Letter regarding a sample polarised moving iron Ammeter with cracked glass and plans for future UK manufacturing. | 3rd Dec 1931 | Box 168 \ 5 img224 | |
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