| Description | Date | Identifier | |
| Letter from Weston Electrical Instrument Company Ltd. awaiting further comments. | 3rd Dec 1931 | Box 168 \ 5 img225 | |
| Quoting the Weston Electrical Instrument Co. regarding a sample polarised moving iron ammeter. | 6th Dec 1931 | Box 168 \ 5 img226 | |
| Request to order a B.M.2 Ammeter from Messrs. Joseph Lucas, Ltd. as the sample was rendered unfit for return after examination. | 7th Dec 1931 | Box 168 \ 5 img227 | |
| Letter to the Weston Electric Instrument Co. detailing the test results of a loaned moving iron chassis ammeter. | 14th Dec 1931 | Box 168 \ 5 img228 | |
| Letter requesting comments on test results and clarification on instrument discharge capacity. | 14th Dec 1931 | Box 168 \ 5 img229 | |
| Follow-up letter to the Weston Electrical Instrument Co. regarding a Weston Moving Iron Chassis Ammeter. | 2nd Jan 1932 | Box 168 \ 5 img230 | |
| Correspondence regarding a request for an order to repair a damaged Ammeter No. 158478. | 4th Feb 1932 | Box 168 \ 5 img231 | |
| Requesting the repair and stocking of an Elliott Ammeter. | 5th Feb 1932 | Box 168 \ 5 img232 | |
| Letter to The Weston Electrical Instrument Co. Ltd. regarding a lost or misplaced letter from the previous month. | 7th Jan 1932 | Box 168 \ 5 img233 | |
| Letter from Weston Electrical Instrument Co. regarding the performance and potential supply of Model 354 Ammeters. | 13th Jan 1932 | Box 168 \ 5 img234 | |
| Testing of a Weston moving iron ammeter for the 40/50 instrument patch, comparing it to a Lucas ammeter. | 14th Nov 1932 | Box 168 \ 5 img235 | |
| Test report on the accuracy and performance of a Moving Iron Ammeter. | 16th Jan 1932 | Box 168 \ 5 img236 | |
| Confirmation that the proposal for a Weston Moving Iron Ammeter has been dropped. | 16th Feb 1932 | Box 168 \ 5 img237 | |
| Letter to Joseph Lucas Ltd. concerning the testing of a sample ammeter and the need for improved damping. | 10th Apr 1932 | Box 168 \ 5 img238 | |
| Inquiry to various suppliers regarding the production and price of a moving coil ammeter. | 23th Apr 1932 | Box 168 \ 5 img239 | |
| Letter to Joseph Lucas Ltd. requesting samples of damped Lucas Ammeters for trial. | 11th May 1932 | Box 168 \ 5 img240 | |
| Letter from Joseph Lucas Limited regarding the development of Ammeters with special damping. | 13th May 1932 | Box 168 \ 5 img241 | |
| Tests on Kigass ignition distributors, coils, and observed oscillations. | 7th Jul 1932 | Box 168 \ 5 img242 | |
| Request for a C.A.V. Ammeter on approval for use with commercial vehicles and buses. | 13th Feb 1933 | Box 168 \ 5 img243 | |
| Sample C.A.V. moving coil chassis ammeter and obtaining a central zero version. | 3rd Mar 1933 | Box 168 \ 5 img244 | |
| The urgent procurement and testing of a Weston Moving Iron Chassis Ammeter. | 22th Mar 1933 | Box 168 \ 5 img245 | |
| Whether to fit an ammeter to a chassis with a vibrator-controlled dynamo. | 29th Mar 1933 | Box 168 \ 5 img246 | |
| Arguing against the deletion of ammeters from the chassis, suggesting it would give an impression of skimpiness. | 30th Mar 1933 | Box 168 \ 5 img247 | |
| Potential deletion of the ammeter from the chassis and the decision to retain it. | 3rd Apr 1933 | Box 168 \ 5 img248 | |
| Inquiry to Ferranti Ltd regarding the specifications of a microammeter. | 4th Apr 1933 | Box 168 \ 5 img249 | |
| The deletion of an ammeter from the chassis equipment. | 14th Jun 1933 | Box 168 \ 5 img250 | |
| Letter from Ferranti Ltd providing specifications for a 2.5' Micro-Ammeter. | 5th Apr 1933 | Box 168 \ 5 img251 | |
| Follow-up letter regarding the progress and urgent need for Weston moving iron chassis ammeters for various chassis models. | 10th May 1933 | Box 168 \ 5 img252 | |
| Request to order twelve ammeters of two different specifications from Joseph Lucas Co. Ltd. | 16th Jan 1934 | Box 168 \ 5 img253 | |
| Letter to Weston Electrical Instrument Co. Ltd. proposing a visit to discuss difficulties with ammeters. | 16th Jun 1933 | Box 168 \ 5 img254 | |
| Letter from Weston Electrical Instrument Company regarding Moving Iron Ammeters and a planned visit. | 19th Jun 1933 | Box 168 \ 5 img255 | |
| Telegram confirming Mr. Smith's arrival with three ammeters to Roycar, Derby. | 19th Jul 1933 | Box 168 \ 5 img256 | |
| High cost of a modified Weston ammeter and inquiring about a cheaper alternative from Ferranti for the Bensport chassis. | 21th Jun 1933 | Box 168 \ 5 img257 | |
| Required modifications for custom meters supplied by Weston Electrical Instrument Co. for the Pensport Chassis. | 23th Jun 1933 | Box 168 \ 5 img258 | |
| Letter to The Weston Electrical Instrument Co. regarding the finish of a new ammeter for a Bentley chassis. | 23th Jun 1933 | Box 168 \ 5 img259 | |
| Letter from Weston Electrical Instrument Co. Ltd. regarding the finish preference for a bevelled ring on a returned sample. | 24th Jun 1933 | Box 168 \ 5 img260 | |
| Returning a Weston ammeter from a Bentley chassis to the manufacturer for a scale update. | 13th Jul 1933 | Box 168 \ 5 img261 | |
| Letter from Joseph Lucas Limited regarding the mechanism of a damped ammeter. | 16th Sep 1933 | Box 168 \ 5 img262 | |
| Diagram of a rotating mechanical assembly with a connecting rod, showing various measurements. | 27th Dec 1933 | Box 168 \ 5 img263 | |
| Cover note for a letter to the Weston Electrical Instrument Co. concerning a zero error on instruments for R.R. and Bentley chassis. | 27th Dec 1933 | Box 168 \ 5 img264 | |
| Faulty ammeters on Bentley and Phantom II models which fail to return to zero, and the subsequent actions with the supplier, Westons. | 28th Dec 1933 | Box 168 \ 5 img265 | |
| Letter to the Weston Electrical Instrument Co. Ltd. regarding a zero error fault in ammeters for Bentley Chassis. | 27th Dec 1933 | Box 168 \ 5 img266 | |
| Letter investigating a hysteresis effect in a Weston ammeter, concluding the cause is residual magnetism and proposing air-cored poles as a solution. | 9th Jan 1934 | Box 168 \ 5 img267 | |
| Follow-up letter to Weston Electrical Instrument Co. Ltd. regarding a residual zero error on ammeters for R.R. and Bentley chassis. | 9th Jan 1934 | Box 168 \ 5 img268 | |
| Quality issues and failures with Weston Ammeters. | 10th Jan 1934 | Box 168 \ 5 img269 | |
| The failure of Weston ammeters and arrangements for their replacement. | 11th Jan 1934 | Box 168 \ 5 img270 | |
| Failure of Weston ammeters and the testing of Lucas ammeters as a potential replacement. | 11th Jan 1934 | Box 168 \ 5 img271 | |
| Request to obtain a Ferranti ammeter with a front bevel glass as per the Bentley standard. | 27th Jan 1934 | Box 168 \ 5 img272 | |
| Standardising the Ferranti Ammeter for the 40/50-HP Chassis 'S2' Series and Bentley 'B' Series. | 29th Jan 1934 | Box 168 \ 5 img273 | |
| The standardization of Ferranti ammeters pending a 10,000-mile test. | 30th Jan 1934 | Box 168 \ 5 img274 | |
| Two Weston ammeters for the 40/50 HP Chassis. | 30th Jan 1934 | Box 168 \ 5 img275 | |
| Requesting an update on the delivery of Lucas damped ammeters for an experimental test chassis. | 5th Feb 1934 | Box 168 \ 5 img276 | |
| Letter to S. Smith & Sons Ltd. regarding the incorporation of damping on petrol gauge needles to reduce vibration. | 15th Mar 1934 | Box 168 \ 5 img277 | |
| Requesting a delivery timeline for a sample Ferranti ammeter for a Bentley chassis. | 15th Mar 1934 | Box 168 \ 5 img278 | |
| Letter from S. Smith & Sons acknowledging a request to investigate the damping of a petrol gauge meter needle. | 16th Mar 1934 | Box 168 \ 5 img279 | |
| The arrival and trial of Lucas Damped Ammeters for experimental chassis and Bentleys. | 16th Mar 1934 | Box 168 \ 5 img280 | |
| Request to fit Lucas damped ammeters to a list of chassis for testing. | 16th Mar 1934 | Box 168 \ 5 img281 | |
| Faulty Ferranti ammeter being returned for examination due to a short circuit. | 21th Mar 1934 | Box 168 \ 5 img282 | |
| The retesting of a faulty Ferranti ammeter for an R.R. chassis. | 5th Apr 1934 | Box 168 \ 5 img283 | |
| Letter from Ferranti Ltd. regarding a returned and repaired 40/50 HP Bentley Ammeter. | 26th Apr 1934 | Box 168 \ 5 img284 | |
| Clarifying a confusion regarding an order for 12 Lucas damped ammeters. | 2nd May 1934 | Box 168 \ 5 img285 | |
| Overload tests conducted on chassis ammeters. | 17th May 1934 | Box 168 \ 5 img286 | |
| Overload test report on various chassis ammeters to determine their performance under heavy current. | 17th May 1934 | Box 168 \ 5 img287 | |
| The calibration of various moving coil instruments before and after testing, with a concluding recommendation. | 17th May 1934 | Box 168 \ 5 img288 | |
| Letter from Elliott Brothers sending a new catalogue sheet for a 'Miniature Current Transformer and Ammeter' and requesting an update to their main catalogue. | 15th May 1934 | Box 168 \ 5 img289 | |
| Specification sheet for a miniature current transformer and ammeter portable testing outfit. | 1st Apr 1934 | Box 168 \ 5 img290 | |
| Specification sheet for a miniature current transformer and ammeter portable testing outfit. | 20th Jun 1934 | Box 168 \ 5 img291 | |
| Requesting a status update on a report for Ferranti Ammeters. | 20th Jun 1934 | Box 168 \ 5 img292 | |
| Road tests and standardization costs for Ferranti ammeters. | 25th Jun 1934 | Box 168 \ 5 img293 | |
| Letter from S. Smith & Sons requesting one ammeter for a Bentley Panel and one for a 40/50 Rolls Panel. | 29th Jun 1934 | Box 168 \ 5 img294 | |
| Instructing the despatch of two chassis ammeters on loan to S. Smith & Sons for instrument panel design. | 30th Jun 1934 | Box 168 \ 5 img295 | |
| Requesting the accuracy testing of three Weston Ammeters from production stock. | 5th Jul 1934 | Box 168 \ 5 img296 | |
| Short memo regarding obtaining competitive prices for Vickers Weymouth pumps and meters. | 7th Jul 1934 | Box 168 \ 5 img297 | |
| The standardization and testing of chassis ammeters. | 7th Jul 1934 | Box 168 \ 5 img298 | |
| Letter from supplier Joseph Lucas Ltd chasing a response on ammeter samples. | 1st Aug 1934 | Box 168 \ 5 img299 | |
| Letter to Joseph Lucas Research Laboratories regarding issues with the damping on their ammeter. | 7th Aug 1934 | Box 168 \ 5 img300 | |
| Blank or unreadable page, possibly a divider sheet. | 7th Aug 1934 | Box 168 \ 5 img301 | |
| Blank or unreadable page with two punch holes on the right. | 3rd Sep 1934 | Box 168 \ 5 img302 | |
| Proposal to increase the ammeter range from 20 to 30 amperes for R.R. & Bentley chassis. | 3rd Sep 1934 | Box 168 \ 5 img303 | |
| Request to obtain ammeters from Ferranti and Weston for comparative testing on a Bentley Chassis. | 3rd Sep 1934 | Box 168 \ 5 img304 | |
| Letter from Ferranti Ltd confirming modifications to an instrument, including the removal of their name from the dial, as requested. | 12th Oct 1934 | Box 168 \ 5 img305 | |
| The incorrect reading of a Ferranti 30 Ampere ammeter and its return for calibration. | 31th Oct 1934 | Box 168 \ 5 img306 | |
| Requesting to fit a Weston Ammeter (30-0-30 range) to J.B.IV after it passed bench tests. | 6th Nov 1934 | Box 168 \ 5 img307 | |
| Faulty ammeter on 27-EX and a request for its replacement. | 6th Nov 1934 | Box 168 \ 5 img308 | |
| Requesting the modification of a Ferranti Ammeter to match a recently delivered sample. | 1st Nov 1934 | Box 168 \ 5 img309 | |
| Potential standardization of Ferranti ammeters to replace the current Weston type. | 27th Dec 1934 | Box 168 \ 5 img310 | |
| Comparing the performance and cost of Ferranti and Weston ammeters for use in Bentley vehicles. | 28th Dec 1934 | Box 168 \ 5 img311 | |
| Faulty Elliott Millivoltmeter (No. 1121620) being sent for repair due to a sluggish needle. | 19th Jan 1935 | Box 168 \ 5 img312 | |
| Dispatch instruction for the repair and recalibration of a Weston Laboratory Instrument. | 1st Jan 1935 | Box 168 \ 5 img313 | |
| Confirming a visit from Weston Electrical Co. to discuss a new instrument design. | 25th Jan 1935 | Box 168 \ 5 img314 | |
| The testing and ordering status for Ferranti Ammeters across various chassis series. | 20th Feb 1935 | Box 168 \ 5 img315 | |
| Letter to a supplier about a moving coil ammeter and the necessity of its zero adjuster. | 22th Feb 1935 | Box 168 \ 5 img316 | |
| The return of a Weston Galvanometer Model 375 for adjustment and re-calibration. | 9th Apr 1935 | Box 168 \ 5 img317 | |
| Urgent request to obtain three Weston ammeters for drawing D.74874. | 25th Apr 1935 | Box 168 \ 5 img318 | |
| Sending a Weston Galvanometer Model 375 for overhaul. | 10th May 1935 | Box 168 \ 5 img319 | |
| Request for an additional laboratory ammeter for use in Merlin aero starter motor tests. | 13th Nov 1935 | Box 168 \ 5 img320 | |
| Request to return a faulty Weston Laboratory Instrument for overhaul due to a bad switch contact. | 24th Dec 1935 | Box 168 \ 5 img321 | |
| Letter to a supplier regarding a returned ammeter and a missing official Air Ministry release note. | 15th Aug 1936 | Box 168 \ 5 img322 | |
| Letter from Metropolitan-Vickers Electrical Co. confirming the repair of an ammeter and enclosing an Air Ministry release note. | 20th Aug 1936 | Box 168 \ 5 img323 | |
| Requesting the return of a faulty Weston Volt-ammeter for repair for the third time due to a loose needle. | 20th Aug 1936 | Box 168 \ 5 img324 | |
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