Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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Letter from Weston Electrical Instrument Company Ltd. awaiting further comments.3rd Dec 1931Box 168 \ 5  img225
Quoting the Weston Electrical Instrument Co. regarding a sample polarised moving iron ammeter.6th Dec 1931Box 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 1931Box 168 \ 5  img227
Letter to the Weston Electric Instrument Co. detailing the test results of a loaned moving iron chassis ammeter.14th Dec 1931Box 168 \ 5  img228
Letter requesting comments on test results and clarification on instrument discharge capacity.14th Dec 1931Box 168 \ 5  img229
Follow-up letter to the Weston Electrical Instrument Co. regarding a Weston Moving Iron Chassis Ammeter.2nd Jan 1932Box 168 \ 5  img230
Correspondence regarding a request for an order to repair a damaged Ammeter No. 158478.4th Feb 1932Box 168 \ 5  img231
Requesting the repair and stocking of an Elliott Ammeter.5th Feb 1932Box 168 \ 5  img232
Letter to The Weston Electrical Instrument Co. Ltd. regarding a lost or misplaced letter from the previous month.7th Jan 1932Box 168 \ 5  img233
Letter from Weston Electrical Instrument Co. regarding the performance and potential supply of Model 354 Ammeters.13th Jan 1932Box 168 \ 5  img234
Testing of a Weston moving iron ammeter for the 40/50 instrument patch, comparing it to a Lucas ammeter.14th Nov 1932Box 168 \ 5  img235
Test report on the accuracy and performance of a Moving Iron Ammeter.16th Jan 1932Box 168 \ 5  img236
Confirmation that the proposal for a Weston Moving Iron Ammeter has been dropped.16th Feb 1932Box 168 \ 5  img237
Letter to Joseph Lucas Ltd. concerning the testing of a sample ammeter and the need for improved damping.10th Apr 1932Box 168 \ 5  img238
Inquiry to various suppliers regarding the production and price of a moving coil ammeter.23th Apr 1932Box 168 \ 5  img239
Letter to Joseph Lucas Ltd. requesting samples of damped Lucas Ammeters for trial.11th May 1932Box 168 \ 5  img240
Letter from Joseph Lucas Limited regarding the development of Ammeters with special damping.13th May 1932Box 168 \ 5  img241
Tests on Kigass ignition distributors, coils, and observed oscillations.7th Jul 1932Box 168 \ 5  img242
Request for a C.A.V. Ammeter on approval for use with commercial vehicles and buses.13th Feb 1933Box 168 \ 5  img243
Sample C.A.V. moving coil chassis ammeter and obtaining a central zero version.3rd Mar 1933Box 168 \ 5  img244
The urgent procurement and testing of a Weston Moving Iron Chassis Ammeter.22th Mar 1933Box 168 \ 5  img245
Whether to fit an ammeter to a chassis with a vibrator-controlled dynamo.29th Mar 1933Box 168 \ 5  img246
Arguing against the deletion of ammeters from the chassis, suggesting it would give an impression of skimpiness.30th Mar 1933Box 168 \ 5  img247
Potential deletion of the ammeter from the chassis and the decision to retain it.3rd Apr 1933Box 168 \ 5  img248
Inquiry to Ferranti Ltd regarding the specifications of a microammeter.4th Apr 1933Box 168 \ 5  img249
The deletion of an ammeter from the chassis equipment.14th Jun 1933Box 168 \ 5  img250
Letter from Ferranti Ltd providing specifications for a 2.5' Micro-Ammeter.5th Apr 1933Box 168 \ 5  img251
Follow-up letter regarding the progress and urgent need for Weston moving iron chassis ammeters for various chassis models.10th May 1933Box 168 \ 5  img252
Request to order twelve ammeters of two different specifications from Joseph Lucas Co. Ltd.16th Jan 1934Box 168 \ 5  img253
Letter to Weston Electrical Instrument Co. Ltd. proposing a visit to discuss difficulties with ammeters.16th Jun 1933Box 168 \ 5  img254
Letter from Weston Electrical Instrument Company regarding Moving Iron Ammeters and a planned visit.19th Jun 1933Box 168 \ 5  img255
Telegram confirming Mr. Smith's arrival with three ammeters to Roycar, Derby.19th Jul 1933Box 168 \ 5  img256
High cost of a modified Weston ammeter and inquiring about a cheaper alternative from Ferranti for the Bensport chassis.21th Jun 1933Box 168 \ 5  img257
Required modifications for custom meters supplied by Weston Electrical Instrument Co. for the Pensport Chassis.23th Jun 1933Box 168 \ 5  img258
Letter to The Weston Electrical Instrument Co. regarding the finish of a new ammeter for a Bentley chassis.23th Jun 1933Box 168 \ 5  img259
Letter from Weston Electrical Instrument Co. Ltd. regarding the finish preference for a bevelled ring on a returned sample.24th Jun 1933Box 168 \ 5  img260
Returning a Weston ammeter from a Bentley chassis to the manufacturer for a scale update.13th Jul 1933Box 168 \ 5  img261
Letter from Joseph Lucas Limited regarding the mechanism of a damped ammeter.16th Sep 1933Box 168 \ 5  img262
Diagram of a rotating mechanical assembly with a connecting rod, showing various measurements.27th Dec 1933Box 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 1933Box 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 1933Box 168 \ 5  img265
Letter to the Weston Electrical Instrument Co. Ltd. regarding a zero error fault in ammeters for Bentley Chassis.27th Dec 1933Box 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 1934Box 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 1934Box 168 \ 5  img268
Quality issues and failures with Weston Ammeters.10th Jan 1934Box 168 \ 5  img269
The failure of Weston ammeters and arrangements for their replacement.11th Jan 1934Box 168 \ 5  img270
Failure of Weston ammeters and the testing of Lucas ammeters as a potential replacement.11th Jan 1934Box 168 \ 5  img271
Request to obtain a Ferranti ammeter with a front bevel glass as per the Bentley standard.27th Jan 1934Box 168 \ 5  img272
Standardising the Ferranti Ammeter for the 40/50-HP Chassis 'S2' Series and Bentley 'B' Series.29th Jan 1934Box 168 \ 5  img273
The standardization of Ferranti ammeters pending a 10,000-mile test.30th Jan 1934Box 168 \ 5  img274
Two Weston ammeters for the 40/50 HP Chassis.30th Jan 1934Box 168 \ 5  img275
Requesting an update on the delivery of Lucas damped ammeters for an experimental test chassis.5th Feb 1934Box 168 \ 5  img276
Letter to S. Smith & Sons Ltd. regarding the incorporation of damping on petrol gauge needles to reduce vibration.15th Mar 1934Box 168 \ 5  img277
Requesting a delivery timeline for a sample Ferranti ammeter for a Bentley chassis.15th Mar 1934Box 168 \ 5  img278
Letter from S. Smith & Sons acknowledging a request to investigate the damping of a petrol gauge meter needle.16th Mar 1934Box 168 \ 5  img279
The arrival and trial of Lucas Damped Ammeters for experimental chassis and Bentleys.16th Mar 1934Box 168 \ 5  img280
Request to fit Lucas damped ammeters to a list of chassis for testing.16th Mar 1934Box 168 \ 5  img281
Faulty Ferranti ammeter being returned for examination due to a short circuit.21th Mar 1934Box 168 \ 5  img282
The retesting of a faulty Ferranti ammeter for an R.R. chassis.5th Apr 1934Box 168 \ 5  img283
Letter from Ferranti Ltd. regarding a returned and repaired 40/50 HP Bentley Ammeter.26th Apr 1934Box 168 \ 5  img284
Clarifying a confusion regarding an order for 12 Lucas damped ammeters.2nd May 1934Box 168 \ 5  img285
Overload tests conducted on chassis ammeters.17th May 1934Box 168 \ 5  img286
Overload test report on various chassis ammeters to determine their performance under heavy current.17th May 1934Box 168 \ 5  img287
The calibration of various moving coil instruments before and after testing, with a concluding recommendation.17th May 1934Box 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 1934Box 168 \ 5  img289
Specification sheet for a miniature current transformer and ammeter portable testing outfit.1st Apr 1934Box 168 \ 5  img290
Specification sheet for a miniature current transformer and ammeter portable testing outfit.20th Jun 1934Box 168 \ 5  img291
Requesting a status update on a report for Ferranti Ammeters.20th Jun 1934Box 168 \ 5  img292
Road tests and standardization costs for Ferranti ammeters.25th Jun 1934Box 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 1934Box 168 \ 5  img294
Instructing the despatch of two chassis ammeters on loan to S. Smith & Sons for instrument panel design.30th Jun 1934Box 168 \ 5  img295
Requesting the accuracy testing of three Weston Ammeters from production stock.5th Jul 1934Box 168 \ 5  img296
Short memo regarding obtaining competitive prices for Vickers Weymouth pumps and meters.7th Jul 1934Box 168 \ 5  img297
The standardization and testing of chassis ammeters.7th Jul 1934Box 168 \ 5  img298
Letter from supplier Joseph Lucas Ltd chasing a response on ammeter samples.1st Aug 1934Box 168 \ 5  img299
Letter to Joseph Lucas Research Laboratories regarding issues with the damping on their ammeter.7th Aug 1934Box 168 \ 5  img300
Blank or unreadable page, possibly a divider sheet.7th Aug 1934Box 168 \ 5  img301
Blank or unreadable page with two punch holes on the right.3rd Sep 1934Box 168 \ 5  img302
Proposal to increase the ammeter range from 20 to 30 amperes for R.R. & Bentley chassis.3rd Sep 1934Box 168 \ 5  img303
Request to obtain ammeters from Ferranti and Weston for comparative testing on a Bentley Chassis.3rd Sep 1934Box 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 1934Box 168 \ 5  img305
The incorrect reading of a Ferranti 30 Ampere ammeter and its return for calibration.31th Oct 1934Box 168 \ 5  img306
Requesting to fit a Weston Ammeter (30-0-30 range) to J.B.IV after it passed bench tests.6th Nov 1934Box 168 \ 5  img307
Faulty ammeter on 27-EX and a request for its replacement.6th Nov 1934Box 168 \ 5  img308
Requesting the modification of a Ferranti Ammeter to match a recently delivered sample.1st Nov 1934Box 168 \ 5  img309
Potential standardization of Ferranti ammeters to replace the current Weston type.27th Dec 1934Box 168 \ 5  img310
Comparing the performance and cost of Ferranti and Weston ammeters for use in Bentley vehicles.28th Dec 1934Box 168 \ 5  img311
Faulty Elliott Millivoltmeter (No. 1121620) being sent for repair due to a sluggish needle.19th Jan 1935Box 168 \ 5  img312
Dispatch instruction for the repair and recalibration of a Weston Laboratory Instrument.1st Jan 1935Box 168 \ 5  img313
Confirming a visit from Weston Electrical Co. to discuss a new instrument design.25th Jan 1935Box 168 \ 5  img314
The testing and ordering status for Ferranti Ammeters across various chassis series.20th Feb 1935Box 168 \ 5  img315
Letter to a supplier about a moving coil ammeter and the necessity of its zero adjuster.22th Feb 1935Box 168 \ 5  img316
The return of a Weston Galvanometer Model 375 for adjustment and re-calibration.9th Apr 1935Box 168 \ 5  img317
Urgent request to obtain three Weston ammeters for drawing D.74874.25th Apr 1935Box 168 \ 5  img318
Sending a Weston Galvanometer Model 375 for overhaul.10th May 1935Box 168 \ 5  img319
Request for an additional laboratory ammeter for use in Merlin aero starter motor tests.13th Nov 1935Box 168 \ 5  img320
Request to return a faulty Weston Laboratory Instrument for overhaul due to a bad switch contact.24th Dec 1935Box 168 \ 5  img321
Letter to a supplier regarding a returned ammeter and a missing official Air Ministry release note.15th Aug 1936Box 168 \ 5  img322
Letter from Metropolitan-Vickers Electrical Co. confirming the repair of an ammeter and enclosing an Air Ministry release note.20th Aug 1936Box 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 1936Box 168 \ 5  img324


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