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 S. Smith & Sons regarding a failed instrument due to the fracture of two trip star teeth.22th Apr 1940Box 165 \ 2  img238
Correspondence with A.T. Speedometer Co. Ltd. regarding speedometer drives and faulty cables.29th Apr 1940Box 165 \ 2  img239
Letter to A. T. Speedometer Co. Ltd. concerning type drives, faulty cables, and drive ends.29th Apr 1940Box 165 \ 2  img240
Letter from A.T. Speedometer Co., Ltd. arranging a meeting.7th May 1940Box 165 \ 2  img241
Request to modify speedometer No. X.635 for use in a Bentley car.14th May 1940Box 165 \ 2  img242
Failure of a speedometer's trip mileage mechanism on car 8.B.V. and arranging its return.14th May 1940Box 165 \ 2  img243
The failure of a speedometer on car 8.B.V. and arranging for its return for repair.14th May 1940Box 165 \ 2  img244
The return of a speedometer for examination and correction.14th May 1940Box 165 \ 2  img245
Request to modify speedometer No. X.635 for use in a Bentley car.14th May 1940Box 165 \ 2  img246
Letter to A.T. Speedometer Co. Ltd. regarding a failed trip mechanism and fluctuating special drive.15th May 1940Box 165 \ 2  img247
Letter to A.T. Speedometer Co., Ltd. regarding failing speedometers on experimental cars.15th May 1940Box 165 \ 2  img248
Despatch note for a speedometer being returned for overhaul and adjustment.17th May 1940Box 165 \ 2  img249
Letter to A.R. Speedometer Co. Ltd. regarding the overhaul, adjustment, and recalibration of speedometer No. X.635.20th May 1940Box 165 \ 2  img250
Letter from A.T. Speedometer Co. regarding a repaired instrument and the preparation of new sample cables.23th May 1940Box 165 \ 2  img251
Letter from A.T. Speedometer Co., Ltd. arranging a business visit with Mr. Robotham.28th May 1940Box 165 \ 2  img252
Fault report and repair request for a speedometer that sticks at 30 m.p.h.29th May 1940Box 165 \ 2  img253
Providing particulars of the internal components for a speedometer and petrol gauge produced by Smith's.22th Jun 1940Box 165 \ 2  img254
Drawing of the latest speedometer dimensions for a new instrument board.27th Jun 1940Box 165 \ 2  img255
Letter to A.T. Speedometer Co. regarding a faulty ATF 14 drive and arranging a visit to discuss improvements.6th May 1940Box 165 \ 2  img256
Letter from S. Smith & Sons regarding a trip failure on an A.T. instrument.4th Sep 1940Box 165 \ 2  img257
The investigation of faults, such as oscillation and noise, in speedometer drive cables.6th Sep 1940Box 165 \ 2  img258
Evaluation of different diameter drive cables, concluding with a recommendation to use the older, more reliable type.6th Sep 1940Box 165 \ 2  img259
Notification about returning a faulty speedometer for examination and repair.6th Sep 1940Box 165 \ 2  img260
Letter to a supplier regarding persistent speedometer trip failures and proposing replacement with improved units.6th Sep 1940Box 165 \ 2  img261
Investigation into speedometer drive cable noise and instrument pointer oscillation.6th Sep 1940Box 165 \ 2  img262
Report comparing the performance of different diameter drive cables and a new asbestos-lined type, focusing on oscillation issues.6th Sep 1940Box 165 \ 2  img263
Return of a faulty speedometer to S. Smith & Son Ltd. for examination and repair.6th Sep 1940Box 165 \ 2  img264
Inter-house memorandum concerning the examination of a faulty speedometer.10th Sep 1940Box 165 \ 2  img265
Letter from S. Smith & Sons regarding a faulty speedometer on a specific chassis.12th Sep 1940Box 165 \ 2  img266
Letter to S. Smith & Sons Ltd concerning speedometer failures, flexible drive issues, and deferring a visit.15th Sep 1940Box 165 \ 2  img267
Letter to a supplier discussing failures in speedometers and flexible shafting, and arranging for new parts for testing.15th Sep 1940Box 165 \ 2  img268
Letter from S. Smith & Sons regarding an A.T. Speedometer under investigation.9th Sep 1940Box 165 \ 2  img269
Letter from S. Smith & Sons regarding the modification of speedometers for blackout conditions.18th Sep 1940Box 165 \ 2  img270
Letter from S. Smith & Sons regarding flexible shafting and speedometer experiments.19th Sep 1940Box 165 \ 2  img271
Letter to A.T. Speedometer Co. Ltd. regarding the recalibration of speedometers for experimental cars.19th Sep 1940Box 165 \ 2  img273
Despatch of three A.T. speedometers for recalibration.19th Sep 1940Box 165 \ 2  img274
Letter to S. Smith & Sons Ltd. regarding the luminising of speedometers and specifications for flex lengths.23th Sep 1940Box 165 \ 2  img275
Letter from A.T. Speedometer Co., Ltd. regarding the conversion of three instruments for use on a Bentley chassis.26th Sep 1940Box 165 \ 2  img276
Letter regarding the sending of three speedometers for recalibration and alteration of the mileage recorder.4th Oct 1940Box 165 \ 2  img277
Letter from A.T. Speedometer Co. Ltd. confirming the dispatch of six heavier-type flexibles for speedometers.4th Oct 1940Box 165 \ 2  img278
Dispatch of three speedometers to A.T. Speedometer Co. for re-calibration.4th Oct 1940Box 165 \ 2  img279
Letter to A.T. Speedometer Co., Ltd. regarding the dispatch of three speedometers for recalibration and alteration.4th Oct 1940Box 165 \ 2  img280
Letter to A.T. Speedometer Co. Ltd. requesting a modification to six speedometers, changing the marking from 700 to 650 revs/mile.14th Oct 1940Box 165 \ 2  img281
Letter from S. Smith & Sons discussing the luminising of speedometers and the supply of flexes.25th Sep 1940Box 165 \ 2  img282
Letter from S. Smith & Sons regarding a miscommunication over flex length requirements and the dispatch of instruments.27th Sep 1940Box 165 \ 2  img283
Letter from S. Smith & Sons to W.A. Robotham regarding an instruction to cease supply of cheaper type flex and the resulting outstanding stock.2nd Oct 1940Box 165 \ 2  img284
Short typed letter suggesting a light cable contract be passed to a less discriminating manufacturer.9th Oct 1940Box 165 \ 2  img285
New scheme for a servo and transmission shaft extension for the Junior Gearbox.5th Nov 1940Box 165 \ 2  img286
Letter of inquiry about obtaining speedometers with an anti-clockwise pointer movement.6th Nov 1940Box 165 \ 2  img287
Letter from A.T. Speedometer Co. Ltd confirming that speedometers can be supplied with anticlockwise rotation at no extra cost.11th Nov 1940Box 165 \ 2  img288
Recommendations for a fifth wheel speedometer.15th Nov 1940Box 165 \ 2  img289
Dispatch of speedometer No.0195 for re-calibration.17th Nov 1940Box 165 \ 2  img290
Letter to A.T. Speedometer Co. Ltd. requesting the overhaul and recalibration of a speedometer for a test rig.17th Nov 1940Box 165 \ 2  img291
Confirmation that no extra cost will be incurred for an anti-clockwise rotation speedometer.18th Nov 1940Box 165 \ 2  img292
Requesting a covering order for a flexible drive and speedometer overhaul.19th Nov 1940Box 165 \ 2  img293
Letter to A.T. Speedometer Co. enquiring about the expense of reversing a speedometer drive.26th Nov 1940Box 165 \ 2  img294
Letter from A.T. Speedometer Co. discussing the supply of anticlockwise rotation instruments.28th Nov 1940Box 165 \ 2  img295
Letter from A.T. Speedometer Co. regarding the calibration of an instrument with a contracted scale dial.9th Dec 1940Box 165 \ 2  img296
Requesting a covering order for the recalibration of six speedometers.4th Dec 1940Box 165 \ 2  img297
The speedometer drive, stating that reversing its rotation would necessitate a costly design alteration.4th Dec 1940Box 165 \ 2  img298
Abandonment of a standard speedometer drive, steering design, and fitting a Minx gearbox into the Myth car.9th Dec 1940Box 165 \ 2  img299
Letter to A.T. Speedometer Co. regarding the calibration of an instrument for a test bed and the dispatch of a 15ft. cable.12th Dec 1940Box 165 \ 2  img300
Charge for converting and luminising six returned A.T. Speedometers.20th Dec 1940Box 165 \ 2  img301
The calibration error of a 5th wheel speedometer and its history.1st Jan 1941Box 165 \ 2  img302
Speedometer calibration adjustments due to a change in wheel and tyre circumference, with recommendations.1st Jan 1941Box 165 \ 2  img303
Agreeing to the charge for converting and luminising 6 A.T. speedometers.3rd Jan 1941Box 165 \ 2  img304
Letter from A.T. Speedometer Co., Ltd. requesting further information to fulfill an order for a Rev. Counter.24th Feb 1941Box 165 \ 2  img305
Letter to A.T. Speedometer Co. regarding the testing and provision of revolution counters.20th Feb 1941Box 165 \ 2  img306
Letter to A.T. Speedometer Co. Ltd. concerning instrument calibration and generator specifications.26th Feb 1941Box 165 \ 2  img307
Letter to A.T. Speedometer Co. Ltd. regarding an order for tachometer drives and other instruments.3rd Mar 1941Box 165 \ 2  img308
Letter from A.T. Speedometer Co. regarding the inability to supply an Electric Rev. Counter with a specific calibration, offering alternatives.6th Mar 1941Box 165 \ 2  img309
Letter concerning the difficulty of supplying electric rev-counters with odd calibration ratios and requesting a specific alternative.9th Mar 1941Box 165 \ 2  img310
Covering order for a rev-counter and cable, and noting an incorrect speedometer and drive have been returned.26th Mar 1941Box 165 \ 2  img311
Letter to A.T. Speedometer Co., Ltd. confirming the dispatch of a special rev-counter and drive.26th Mar 1941Box 165 \ 2  img312
Letter from A.T. Speedometer Co. Ltd. confirming the forwarding of Electric and Magnetic Instruments and Cables.15th Mar 1941Box 165 \ 2  img313
Decisions on the 'Myth' model's instrument board and tool drawer contents following a meeting.11th Mar 1941Box 165 \ 2  img314
Meeting notes discussing design decisions for various car body components like bumpers, wings, and interior trim.11th Mar 1941Box 165 \ 2  img315
Letter from A.T. Speedometer Co., Ltd. regarding the dispatch and specification of an Electric Rev. Counter.27th Mar 1941Box 165 \ 2  img316
Short typed message regarding travel arrangements for Arrowsmith's arrival.7th Apr 1941Box 165 \ 2  img317
Requesting an order for rev-counters and noting the cancellation of a previous one.9th Apr 1941Box 165 \ 2  img318
Letter to S. Smith & Sons requesting the supply and calibration of two tank rev-counters.9th Apr 1941Box 165 \ 2  img319
Speedometer accuracy issues due to the increase in effective tyre radius at speed.11th Apr 1941Box 165 \ 2  img320
Letter from a supplier regarding the forwarding and supply of two electric revolution counters.17th Apr 1941Box 165 \ 2  img321
Delivery of a 3' diameter magnetic rev-counter.18th Apr 1941Box 165 \ 2  img322
The urgent despatch of a rev-counter and drive to the A.T. Speedometer Co.26th Mar 1941Box 165 \ 2  img323
Requesting a covering order for speedometer components and noting the return of incorrect parts.26th Mar 1941Box 165 \ 2  img324
Speedometer drives, steering design, and fitting a Minx gearbox into the Myth project vehicle.9th Dec 1940Box 165 \ 2  img325
Letter from A.T. Speedometer Co., Ltd. concerning the re-calibration of Speedometer No. Z.318.27th Jun 1941Box 165 \ 2  img326
Sending an incorrect rev-counter drive cable back for rectification.12th Jun 1941Box 165 \ 2  img327
Letter to a supplier regarding a rev-counter drive of the wrong construction.12th Jun 1941Box 165 \ 2  img328
Letter from A.T. Speedometer Co., Ltd. acknowledging a query about the calibration of speedometers.17th Jun 1941Box 165 \ 2  img329
Letter to A.T. Speedometer Co., Ltd. regarding required modifications for speedometer calibration.17th Jun 1941Box 165 \ 2  img330
Requesting the urgent overhaul and recalibration of a speedometer for a customer's car.24th Jun 1941Box 165 \ 2  img331
Letter to A.T. Speedometer Co. Ltd. requesting the urgent recalibration and overhaul of speedometer No. Z.318.24th Jun 1941Box 165 \ 2  img332
Letter to The A.T. Speedometer Co., Ltd. regarding the effect of tyre radius on speedometer accuracy.1st Aug 1941Box 165 \ 2  img333
Analysis of wheel and speedometer revolutions per mile for Dunlop 'Fort' 650 x 16 tyres on a B.V. model with a 10/43 axle ratio.1st Aug 1941Box 165 \ 2  img334
Typed letter discussing speedometer corrections needed due to tyre performance variations.19th Aug 1941Box 165 \ 2  img335
Letter from A.T. Speedometer Co. Ltd. regarding specifications for modified instrument dials for the Phantom III and 25/30 Bentley.19th Aug 1941Box 165 \ 2  img336
Letter to A.T. Instruments Ltd. concerning a proposed modification to a speedometer calibration.24th Aug 1941Box 165 \ 2  img338
Modifying a pocket voltmeter to compare condenser capacities for battery ignition systems.2nd Jul 1918Box 165 \ 3  img001


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