| Description | Date | Identifier | |
| Letter from S. Smith & Sons regarding a failed instrument due to the fracture of two trip star teeth. | 22th Apr 1940 | Box 165 \ 2 img238 | |
| Correspondence with A.T. Speedometer Co. Ltd. regarding speedometer drives and faulty cables. | 29th Apr 1940 | Box 165 \ 2 img239 | |
| Letter to A. T. Speedometer Co. Ltd. concerning type drives, faulty cables, and drive ends. | 29th Apr 1940 | Box 165 \ 2 img240 | |
| Letter from A.T. Speedometer Co., Ltd. arranging a meeting. | 7th May 1940 | Box 165 \ 2 img241 | |
| Request to modify speedometer No. X.635 for use in a Bentley car. | 14th May 1940 | Box 165 \ 2 img242 | |
| Failure of a speedometer's trip mileage mechanism on car 8.B.V. and arranging its return. | 14th May 1940 | Box 165 \ 2 img243 | |
| The failure of a speedometer on car 8.B.V. and arranging for its return for repair. | 14th May 1940 | Box 165 \ 2 img244 | |
| The return of a speedometer for examination and correction. | 14th May 1940 | Box 165 \ 2 img245 | |
| Request to modify speedometer No. X.635 for use in a Bentley car. | 14th May 1940 | Box 165 \ 2 img246 | |
| Letter to A.T. Speedometer Co. Ltd. regarding a failed trip mechanism and fluctuating special drive. | 15th May 1940 | Box 165 \ 2 img247 | |
| Letter to A.T. Speedometer Co., Ltd. regarding failing speedometers on experimental cars. | 15th May 1940 | Box 165 \ 2 img248 | |
| Despatch note for a speedometer being returned for overhaul and adjustment. | 17th May 1940 | Box 165 \ 2 img249 | |
| Letter to A.R. Speedometer Co. Ltd. regarding the overhaul, adjustment, and recalibration of speedometer No. X.635. | 20th May 1940 | Box 165 \ 2 img250 | |
| Letter from A.T. Speedometer Co. regarding a repaired instrument and the preparation of new sample cables. | 23th May 1940 | Box 165 \ 2 img251 | |
| Letter from A.T. Speedometer Co., Ltd. arranging a business visit with Mr. Robotham. | 28th May 1940 | Box 165 \ 2 img252 | |
| Fault report and repair request for a speedometer that sticks at 30 m.p.h. | 29th May 1940 | Box 165 \ 2 img253 | |
| Providing particulars of the internal components for a speedometer and petrol gauge produced by Smith's. | 22th Jun 1940 | Box 165 \ 2 img254 | |
| Drawing of the latest speedometer dimensions for a new instrument board. | 27th Jun 1940 | Box 165 \ 2 img255 | |
| Letter to A.T. Speedometer Co. regarding a faulty ATF 14 drive and arranging a visit to discuss improvements. | 6th May 1940 | Box 165 \ 2 img256 | |
| Letter from S. Smith & Sons regarding a trip failure on an A.T. instrument. | 4th Sep 1940 | Box 165 \ 2 img257 | |
| The investigation of faults, such as oscillation and noise, in speedometer drive cables. | 6th Sep 1940 | Box 165 \ 2 img258 | |
| Evaluation of different diameter drive cables, concluding with a recommendation to use the older, more reliable type. | 6th Sep 1940 | Box 165 \ 2 img259 | |
| Notification about returning a faulty speedometer for examination and repair. | 6th Sep 1940 | Box 165 \ 2 img260 | |
| Letter to a supplier regarding persistent speedometer trip failures and proposing replacement with improved units. | 6th Sep 1940 | Box 165 \ 2 img261 | |
| Investigation into speedometer drive cable noise and instrument pointer oscillation. | 6th Sep 1940 | Box 165 \ 2 img262 | |
| Report comparing the performance of different diameter drive cables and a new asbestos-lined type, focusing on oscillation issues. | 6th Sep 1940 | Box 165 \ 2 img263 | |
| Return of a faulty speedometer to S. Smith & Son Ltd. for examination and repair. | 6th Sep 1940 | Box 165 \ 2 img264 | |
| Inter-house memorandum concerning the examination of a faulty speedometer. | 10th Sep 1940 | Box 165 \ 2 img265 | |
| Letter from S. Smith & Sons regarding a faulty speedometer on a specific chassis. | 12th Sep 1940 | Box 165 \ 2 img266 | |
| Letter to S. Smith & Sons Ltd concerning speedometer failures, flexible drive issues, and deferring a visit. | 15th Sep 1940 | Box 165 \ 2 img267 | |
| Letter to a supplier discussing failures in speedometers and flexible shafting, and arranging for new parts for testing. | 15th Sep 1940 | Box 165 \ 2 img268 | |
| Letter from S. Smith & Sons regarding an A.T. Speedometer under investigation. | 9th Sep 1940 | Box 165 \ 2 img269 | |
| Letter from S. Smith & Sons regarding the modification of speedometers for blackout conditions. | 18th Sep 1940 | Box 165 \ 2 img270 | |
| Letter from S. Smith & Sons regarding flexible shafting and speedometer experiments. | 19th Sep 1940 | Box 165 \ 2 img271 | |
| Letter to A.T. Speedometer Co. Ltd. regarding the recalibration of speedometers for experimental cars. | 19th Sep 1940 | Box 165 \ 2 img273 | |
| Despatch of three A.T. speedometers for recalibration. | 19th Sep 1940 | Box 165 \ 2 img274 | |
| Letter to S. Smith & Sons Ltd. regarding the luminising of speedometers and specifications for flex lengths. | 23th Sep 1940 | Box 165 \ 2 img275 | |
| Letter from A.T. Speedometer Co., Ltd. regarding the conversion of three instruments for use on a Bentley chassis. | 26th Sep 1940 | Box 165 \ 2 img276 | |
| Letter regarding the sending of three speedometers for recalibration and alteration of the mileage recorder. | 4th Oct 1940 | Box 165 \ 2 img277 | |
| Letter from A.T. Speedometer Co. Ltd. confirming the dispatch of six heavier-type flexibles for speedometers. | 4th Oct 1940 | Box 165 \ 2 img278 | |
| Dispatch of three speedometers to A.T. Speedometer Co. for re-calibration. | 4th Oct 1940 | Box 165 \ 2 img279 | |
| Letter to A.T. Speedometer Co., Ltd. regarding the dispatch of three speedometers for recalibration and alteration. | 4th Oct 1940 | Box 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 1940 | Box 165 \ 2 img281 | |
| Letter from S. Smith & Sons discussing the luminising of speedometers and the supply of flexes. | 25th Sep 1940 | Box 165 \ 2 img282 | |
| Letter from S. Smith & Sons regarding a miscommunication over flex length requirements and the dispatch of instruments. | 27th Sep 1940 | Box 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 1940 | Box 165 \ 2 img284 | |
| Short typed letter suggesting a light cable contract be passed to a less discriminating manufacturer. | 9th Oct 1940 | Box 165 \ 2 img285 | |
| New scheme for a servo and transmission shaft extension for the Junior Gearbox. | 5th Nov 1940 | Box 165 \ 2 img286 | |
| Letter of inquiry about obtaining speedometers with an anti-clockwise pointer movement. | 6th Nov 1940 | Box 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 1940 | Box 165 \ 2 img288 | |
| Recommendations for a fifth wheel speedometer. | 15th Nov 1940 | Box 165 \ 2 img289 | |
| Dispatch of speedometer No.0195 for re-calibration. | 17th Nov 1940 | Box 165 \ 2 img290 | |
| Letter to A.T. Speedometer Co. Ltd. requesting the overhaul and recalibration of a speedometer for a test rig. | 17th Nov 1940 | Box 165 \ 2 img291 | |
| Confirmation that no extra cost will be incurred for an anti-clockwise rotation speedometer. | 18th Nov 1940 | Box 165 \ 2 img292 | |
| Requesting a covering order for a flexible drive and speedometer overhaul. | 19th Nov 1940 | Box 165 \ 2 img293 | |
| Letter to A.T. Speedometer Co. enquiring about the expense of reversing a speedometer drive. | 26th Nov 1940 | Box 165 \ 2 img294 | |
| Letter from A.T. Speedometer Co. discussing the supply of anticlockwise rotation instruments. | 28th Nov 1940 | Box 165 \ 2 img295 | |
| Letter from A.T. Speedometer Co. regarding the calibration of an instrument with a contracted scale dial. | 9th Dec 1940 | Box 165 \ 2 img296 | |
| Requesting a covering order for the recalibration of six speedometers. | 4th Dec 1940 | Box 165 \ 2 img297 | |
| The speedometer drive, stating that reversing its rotation would necessitate a costly design alteration. | 4th Dec 1940 | Box 165 \ 2 img298 | |
| Abandonment of a standard speedometer drive, steering design, and fitting a Minx gearbox into the Myth car. | 9th Dec 1940 | Box 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 1940 | Box 165 \ 2 img300 | |
| Charge for converting and luminising six returned A.T. Speedometers. | 20th Dec 1940 | Box 165 \ 2 img301 | |
| The calibration error of a 5th wheel speedometer and its history. | 1st Jan 1941 | Box 165 \ 2 img302 | |
| Speedometer calibration adjustments due to a change in wheel and tyre circumference, with recommendations. | 1st Jan 1941 | Box 165 \ 2 img303 | |
| Agreeing to the charge for converting and luminising 6 A.T. speedometers. | 3rd Jan 1941 | Box 165 \ 2 img304 | |
| Letter from A.T. Speedometer Co., Ltd. requesting further information to fulfill an order for a Rev. Counter. | 24th Feb 1941 | Box 165 \ 2 img305 | |
| Letter to A.T. Speedometer Co. regarding the testing and provision of revolution counters. | 20th Feb 1941 | Box 165 \ 2 img306 | |
| Letter to A.T. Speedometer Co. Ltd. concerning instrument calibration and generator specifications. | 26th Feb 1941 | Box 165 \ 2 img307 | |
| Letter to A.T. Speedometer Co. Ltd. regarding an order for tachometer drives and other instruments. | 3rd Mar 1941 | Box 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 1941 | Box 165 \ 2 img309 | |
| Letter concerning the difficulty of supplying electric rev-counters with odd calibration ratios and requesting a specific alternative. | 9th Mar 1941 | Box 165 \ 2 img310 | |
| Covering order for a rev-counter and cable, and noting an incorrect speedometer and drive have been returned. | 26th Mar 1941 | Box 165 \ 2 img311 | |
| Letter to A.T. Speedometer Co., Ltd. confirming the dispatch of a special rev-counter and drive. | 26th Mar 1941 | Box 165 \ 2 img312 | |
| Letter from A.T. Speedometer Co. Ltd. confirming the forwarding of Electric and Magnetic Instruments and Cables. | 15th Mar 1941 | Box 165 \ 2 img313 | |
| Decisions on the 'Myth' model's instrument board and tool drawer contents following a meeting. | 11th Mar 1941 | Box 165 \ 2 img314 | |
| Meeting notes discussing design decisions for various car body components like bumpers, wings, and interior trim. | 11th Mar 1941 | Box 165 \ 2 img315 | |
| Letter from A.T. Speedometer Co., Ltd. regarding the dispatch and specification of an Electric Rev. Counter. | 27th Mar 1941 | Box 165 \ 2 img316 | |
| Short typed message regarding travel arrangements for Arrowsmith's arrival. | 7th Apr 1941 | Box 165 \ 2 img317 | |
| Requesting an order for rev-counters and noting the cancellation of a previous one. | 9th Apr 1941 | Box 165 \ 2 img318 | |
| Letter to S. Smith & Sons requesting the supply and calibration of two tank rev-counters. | 9th Apr 1941 | Box 165 \ 2 img319 | |
| Speedometer accuracy issues due to the increase in effective tyre radius at speed. | 11th Apr 1941 | Box 165 \ 2 img320 | |
| Letter from a supplier regarding the forwarding and supply of two electric revolution counters. | 17th Apr 1941 | Box 165 \ 2 img321 | |
| Delivery of a 3' diameter magnetic rev-counter. | 18th Apr 1941 | Box 165 \ 2 img322 | |
| The urgent despatch of a rev-counter and drive to the A.T. Speedometer Co. | 26th Mar 1941 | Box 165 \ 2 img323 | |
| Requesting a covering order for speedometer components and noting the return of incorrect parts. | 26th Mar 1941 | Box 165 \ 2 img324 | |
| Speedometer drives, steering design, and fitting a Minx gearbox into the Myth project vehicle. | 9th Dec 1940 | Box 165 \ 2 img325 | |
| Letter from A.T. Speedometer Co., Ltd. concerning the re-calibration of Speedometer No. Z.318. | 27th Jun 1941 | Box 165 \ 2 img326 | |
| Sending an incorrect rev-counter drive cable back for rectification. | 12th Jun 1941 | Box 165 \ 2 img327 | |
| Letter to a supplier regarding a rev-counter drive of the wrong construction. | 12th Jun 1941 | Box 165 \ 2 img328 | |
| Letter from A.T. Speedometer Co., Ltd. acknowledging a query about the calibration of speedometers. | 17th Jun 1941 | Box 165 \ 2 img329 | |
| Letter to A.T. Speedometer Co., Ltd. regarding required modifications for speedometer calibration. | 17th Jun 1941 | Box 165 \ 2 img330 | |
| Requesting the urgent overhaul and recalibration of a speedometer for a customer's car. | 24th Jun 1941 | Box 165 \ 2 img331 | |
| Letter to A.T. Speedometer Co. Ltd. requesting the urgent recalibration and overhaul of speedometer No. Z.318. | 24th Jun 1941 | Box 165 \ 2 img332 | |
| Letter to The A.T. Speedometer Co., Ltd. regarding the effect of tyre radius on speedometer accuracy. | 1st Aug 1941 | Box 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 1941 | Box 165 \ 2 img334 | |
| Typed letter discussing speedometer corrections needed due to tyre performance variations. | 19th Aug 1941 | Box 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 1941 | Box 165 \ 2 img336 | |
| Letter to A.T. Instruments Ltd. concerning a proposed modification to a speedometer calibration. | 24th Aug 1941 | Box 165 \ 2 img338 | |
| Modifying a pocket voltmeter to compare condenser capacities for battery ignition systems. | 2nd Jul 1918 | Box 165 \ 3 img001 | |
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