| Description | Date | Identifier | |
| Query to S. Smith & Sons about a speedometer and cable, specifically if it was a lightened type. | 16th Dec 1933 | Box 59 \ 2 Scan294 | |
| Correspondence from S. Smith & Sons regarding a light-weight Bentley type speedometer. | 15th Dec 1933 | Box 59 \ 2 Scan295 | |
| Letter regarding the calibration testing of a new lightened type rev-clock and its performance variation with temperature. | 18th Dec 1933 | Box 59 \ 2 Scan296 | |
| Requesting to urgently see the new lightened A.T. Speedometer and Revolution Counter for a Bentley Chassis in London. | 21th Dec 1933 | Box 59 \ 2 Scan297 | |
| New lighted type instruments for Bentley chassis. | 22th Dec 1933 | Box 59 \ 2 Scan298 | |
| Letter to A.T. Speedometer Co. Ltd. about applying modifications from Bentley instruments to standard 20/25 and 40/50 speedometers. | 29th Dec 1933 | Box 59 \ 2 Scan299 | |
| Feedback on new, lightened instruments for a Bentley chassis. | 29th Dec 1933 | Box 59 \ 2 Scan300 | |
| Letter from a speedometer company discussing test results for a Rev-Clock's temperature compensation. | 29th Dec 1933 | Box 59 \ 2 Scan301 | |
| Letter from A.T. Speedometer Co. Ltd. discussing instrument testing differences and suggesting a joint test. | 29th Dec 1933 | Box 59 \ 2 Scan302 | |
| Letter from The A.T. Speedometer Co. discussing the supply and cost of new lightened instruments for various car models. | 1st Jan 1934 | Box 59 \ 2 Scan303 | |
| Letter from A.T. Speedometer Co. Ltd. regarding a quote for new instruments and the costs for samples. | 1st Jan 1934 | Box 59 \ 2 Scan304 | |
| Request for comments on the inspection of a Bentley Speedometer and Rev. Counter with reversed dials. | 2nd Jan 1934 | Box 59 \ 2 Scan305 | |
| Comments on Bentley instruments, attaching a copy of a previous memo that was not received. | 3rd Jan 1934 | Box 59 \ 2 Scan306 | |
| Review and feedback on new lightened instruments for the Bentley Chassis. | 29th Dec 1933 | Box 59 \ 2 Scan307 | |
| Internal order for a standard 40/50 speedometer with altered revs per mile for chassis 27-EX. | 2nd Jan 1934 | Box 59 \ 2 Scan308 | |
| Order for Vulture speedometer and tachometer instruments from the A.T. Speedometer Co. | 8th Jan 1939 | Box 59 \ 2 Scan309 | |
| Letter confirming an order for a speedometer and tachometer with specifications for the 'Vulture' project chassis. | 3rd Jan 1934 | Box 59 \ 2 Scan310 | |
| Letter from Bentley Motors to The A.T. Speedometer Co., Ltd. regarding a delivery deadline for the attention of Mr. Hives. | 5th Jan 1934 | Box 59 \ 2 Scan311 | |
| Letter to A.T. Speedometer Co. Ltd. specifying the revs per mile for a special speedometer. | 3rd Jan 1934 | Box 59 \ 2 Scan312 | |
| Clarifying a misunderstanding about Bentley instruments with reversed dial markings. | 3rd Jan 1934 | Box 59 \ 2 Scan313 | |
| Bentley Instruments, confirming that inverted dials are more acceptable due to better visibility. | 4th Jan 1934 | Box 59 \ 2 Scan314 | |
| Letter to A.T. Speedometer Co. Ltd. arranging a visit to discuss and test lightened type instruments. | 4th Jan 1934 | Box 59 \ 2 Scan315 | |
| Sample speedometer and rev counter with inverted dial figures for Standard Bentley A.T. models. | 5th Jan 1934 | Box 59 \ 2 Scan316 | |
| Letter to the A.T. Speedometer Co. Ltd. requesting a temporary hold on work for special instruments. | 5th Jan 1934 | Box 59 \ 2 Scan317 | |
| Requesting a design and final ratio for a Vulture speedometer and tachometer with a right-angle reduction gear. | 5th Jan 1934 | Box 59 \ 2 Scan318 | |
| Letter from A.T. Speedometer Co., Ltd. arranging a meeting and tests for Mr. West. | 6th Jan 1934 | Box 59 \ 2 Scan319 | |
| Proposal to issue a standardisation sheet for the Bentley A.T. Speedometer and Rev. Counter. | 8th Jan 1934 | Box 59 \ 2 Scan320 | |
| To Mr. Royce regarding the acceptance of instruments from the Jaeger Co. and requesting a sample rev counter. | 11th Jan 1934 | Box 59 \ 2 Scan321 | |
| Letter to A.T. Speedometer Co. Ltd. confirming arrangements for overhauling instruments. | 11th Jan 1934 | Box 59 \ 2 Scan322 | |
| The delivery of lightened Bentley instruments and a Splitdorf Aero Magneto part for modification and testing. | 11th Jan 1934 | Box 59 \ 2 Scan323 | |
| Request to acquire a speedometer testing apparatus from the Bentley Service Depot for use at Derby. | 11th Jan 1934 | Box 59 \ 2 Scan324 | |
| Letter from the A.T. Speedometer Co., Ltd. regarding the design of a speedometer dial for Mr. Evernden's car. | 11th Jan 1934 | Box 59 \ 2 Scan325 | |
| Customer requests for modifications to a Bentley B.171.AE for Captain Eric Burt, including a larger petrol tank and custom bodywork. | 11th Jan 1934 | Box 59 \ 2 Scan326 | |
| Letter to A.T. Speedometer Co. Ltd. regarding an urgently required special speedometer for a Bentley. | 12th Jan 1934 | Box 59 \ 2 Scan327 | |
| Tests for magnetic interference between speedometer and rev counter instruments on a Bentley. | 12th Jan 1934 | Box 59 \ 2 Scan328 | |
| Issues with instrument screening, speedometer calibration, and alternative instrument options on Bentley models. | 12th Jan 1934 | Box 59 \ 2 Scan329 | |
| Letter from The A.T. Speedometer Co., Ltd. confirming a visit and clarifying instrument design details. | 13th Jan 1934 | Box 59 \ 2 Scan330 | |
| Following up on an outstanding invoice from S. Smith & Sons for a speedometer and cable. | 15th Jan 1934 | Box 59 \ 2 Scan331 | |
| The clearance of an invoice against a specific order number. | 16th Jan 1934 | Box 59 \ 2 Scan332 | |
| Telegram received by telephone confirming a special speedometer has been dispatched. | 18th Jan 1934 | Box 59 \ 2 Scan333 | |
| Geared axle and instrument requirements for Bentley chassis No. B-171-AE. | 19th Jan 1934 | Box 59 \ 2 Scan334 | |
| Request for a sample Bentley rev counter dial with specific danger markings. | 19th Jan 1934 | Box 59 \ 2 Scan335 | |
| Querying the differing effects of magnetic interference on Bentley and Rolls-Royce instruments. | 20th Jan 1934 | Box 59 \ 2 Scan336 | |
| Magnetic interference of speedometers caused by their proximity to the ammeter. | 22th Jan 1934 | Box 59 \ 2 Scan337 | |
| Modified instruments and speedometer calibration for Bentley Chassis No. B-171-AE. | 22th Jan 1934 | Box 59 \ 2 Scan338 | |
| Inquiring about the introduction of new lightened type instruments for Bentley cars, discussing existing space and visibility constraints. | 24th Jan 1934 | Box 59 \ 2 Scan339 | |
| Standardisation of new lightened instruments for Bentley, which is pending the completion of road tests. | 25th Jan 1934 | Box 59 \ 2 Scan340 | |
| Steering column adjustment range in relation to Bentley instruments on early cars. | 26th Jan 1934 | Box 59 \ 2 Scan341 | |
| Poor instrument illumination on a Trials 20/25 saloon compared to the superior illumination found on a Terraplane car. | 29th Jan 1934 | Box 59 \ 2 Scan342 | |
| Customer's request for special, non-standard instruments for chassis number B-171-AE. | 2nd Feb 1934 | Box 59 \ 2 Scan343 | |
| Query regarding the mounting and illumination requirements for separate speedometer and revolution counter instruments on chassis B-171-AE. | 2nd Feb 1934 | Box 59 \ 2 Scan344 | |
| Proposal to consider smaller 4-inch speedometer and rev-indicator dials for Bentley cars to allow for more steering column clearance. | 2nd Feb 1934 | Box 59 \ 2 Scan345 | |
| Letter to A.T. Speedometer Co. Ltd. requesting an experimental 4-inch Bentley rev clock dial for comparison against the existing 5-inch model. | 5th Feb 1934 | Box 59 \ 2 Scan346 | |
| Standardisation of the A.T. Rev. Counter and Speedometer with inverted dial markings and pointer. | 9th Jan 1934 | Box 59 \ 2 Scan347 | |
| Letter regarding a request to reduce the diameter of the 5' Bentley instruments and submit an experimental Rev-Clock. | 6th Feb 1934 | Box 59 \ 2 Scan348 | |
| Letter from The A.T. Speedometer Co. Ltd. confirming a sample Bentley Rev-Counter dial was taken by Mr. West. | 6th Feb 1934 | Box 59 \ 2 Scan349 | |
| Letter to A.T. Speedometer Co. Ltd. concerning a failing trip mileage recorder. | 7th Mar 1934 | Box 59 \ 2 Scan350 | |
| Letter from a speedometer supplier chasing an order for a Rev-Clock cable for an experimental chassis. | 8th Mar 1934 | Box 59 \ 2 Scan351 | |
| Letter to The A.T. Speedometer Co. Ltd. to cancel an order for a rev clock cable. | 8th Mar 1934 | Box 59 \ 2 Scan352 | |
| Complaining about the poor finish of an instrument panel on an experimental streamlined Bentley. | 13th Feb 1934 | Box 59 \ 2 Scan353 | |
| The progress of producing smaller 4' dials for Bentley speedometers and rev counters. | 16th Feb 1934 | Box 59 \ 2 Scan354 | |
| Follow-up letter regarding the cost of changing the dials on Bentley instruments. | 16th Feb 1934 | Box 59 \ 2 Scan355 | |
| Letter from S. Smith & Sons regarding instrument design, modification requests and a sample request. | 16th Feb 1934 | Box 59 \ 2 Scan356 | |
| Postscript to a letter regarding the serious difficulties of a suggested conversion scheme. | 16th Feb 1934 | Box 59 \ 2 Scan357 | |
| Difficulties and costs of a suggested conversion for Bentley instruments. | 17th Feb 1934 | Box 59 \ 2 Scan358 | |
| Complaints about the difficulty of seeing Bentley instruments and the subsequent investigation into changing the dials. | 19th Feb 1934 | Box 59 \ 2 Scan359 | |
| Design of the speedometer and rev counter for Bentley vehicles, including dial size and a new proposed layout. | 19th Feb 1934 | Box 59 \ 2 Scan360 | |
| Confirming the instrument panel on the Experimental Streamlined Bentley is a standard production part. | 20th Feb 1934 | Box 59 \ 2 Scan361 | |
| Letter reporting a failure of a lightened type Bentley Speedometer's trip recorder during road testing and requesting a replacement. | 28th Feb 1934 | Box 59 \ 2 Scan362 | |
| Issues with the brightness of speedometer illumination at night and comparing different instrument layouts. | 28th Feb 1934 | Box 59 \ 2 Scan363 | |
| Instrument panel schemes, including an illuminated model with transparent scales for a Bentley. | 28th Feb 1934 | Box 59 \ 2 Scan364 | |
| Letter concerning the replacement of a faulty trip assembly for a light type Bentley Speedometer. | 1st Mar 1934 | Box 59 \ 2 Scan365 | |
| Interior instrument illumination, specifically the brightness of the speedometer on a Terraplane car. | 3rd Mar 1934 | Box 59 \ 2 Scan366 | |
| Failure and return of a trip counter from a lightened type speedometer being tested. | 2nd Mar 1934 | Box 59 \ 2 Scan367 | |
| Letter from S. Smith & Sons regarding an A.T. Speedometer and other special small instruments. | 16th Mar 1934 | Box 59 \ 2 Scan368 | |
| Need to order lighter speedometers and tachometers for a Bentley car. | 19th Mar 1934 | Box 59 \ 2 Scan369 | |
| Failures of a lightened speedometer trip counter for the Bentley chassis. | 22th Mar 1934 | Box 59 \ 2 Scan370 | |
| Letter from A.T. Speedometer Co. about a breakage issue with a light-weight speedometer's trip mechanism and the development of a clutch to fix it. | 22th Mar 1934 | Box 59 \ 2 Scan371 | |
| Letter from A. T. Speedometer Co. Ltd. regarding the continued testing of an instrument and the supply of a new one. | 22th Mar 1934 | Box 59 \ 2 Scan372 | |
| Letter to S. Smith & Sons Ltd. arranging a meeting to discuss instrument illumination for the Bentley chassis. | 26th Mar 1934 | Box 59 \ 2 Scan373 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding the availability of instrument drawings. | 27th Mar 1934 | Box 59 \ 2 Scan374 | |
| Letter to S. Smith & Sons regarding the arrangement of a visit for Mr. Dorer to the works. | 28th Mar 1934 | Box 59 \ 2 Scan375 | |
| Letter chasing the delivery of a sample lightened type A.T. Speedometer from A.T. Speedometer Co. Ltd. | 18th Apr 1934 | Box 59 \ 2 Scan376 | |
| Letter from The A.T. Speedometer Co. regarding the testing and dispatch of an instrument. | 19th Apr 1934 | Box 59 \ 2 Scan377 | |
| Letter concerning a new light-weight speedometer sample with a safety slip mechanism and ongoing illumination experiments. | 21th Apr 1934 | Box 59 \ 2 Scan378 | |
| Request to replace a speedometer with a faulty trip recorder on vehicle 4B.IV. | 25th Apr 1934 | Box 59 \ 2 Scan379 | |
| Request for information regarding the cause of 35 speedometer failures on the 20/25HP Chassis. | 7th May 1934 | Box 59 \ 2 Scan380 | |
| Request to return a lightened A.T. speedometer (Bentley type) to the A.T. Speedometer Co. Ltd. for correction. | 11th May 1934 | Box 59 \ 2 Scan381 | |
| The issues of screening a speedometer and revcounter from interference generated by an ammeter and petrol gauge. | 12th Jan 1934 | Box 59 \ 2 Scan382 | |
| The magnetic screening of ammeters and petrol gauges. | 12th Jan 1934 | Box 59 \ 2 Scan383 | |
| Faulty A.T. Speedometer being returned to the manufacturer for a free-of-charge repair. | 24th May 1934 | Box 59 \ 2 Scan384 | |
| The supply of Bentley speedometers with larger trip figures. | 24th May 1934 | Box 59 \ 2 Scan385 | |
| The development and testing of a new Bentley speedometer with larger trip figures. | 25th May 1934 | Box 59 \ 2 Scan386 | |
| The failed speedometer on the Vulture car and its subsequent repair. | 25th May 1934 | Box 59 \ 2 Scan387 | |
| Letter to A.T. Speedometer Co. Ltd. regarding the repair of a faulty Bentley speedometer. | 25th May 1934 | Box 59 \ 2 Scan388 | |
| Fault with a replacement Lightened Type A.T. Speedometer. | 27th Apr 1934 | Box 59 \ 2 Scan389 | |
| Letter from A.T. Speedometer Co. Ltd. regarding the delayed arrival of an instrument for repair. | 28th May 1934 | Box 59 \ 2 Scan390 | |
| Letter from The A.T. Speedometer Co., Ltd. regarding speedometer failures and repairs. | 31th May 1934 | Box 59 \ 2 Scan391 | |
| Report from A.T. Speedometer Co. Ltd. detailing faults and resolutions for various order numbers. | 31th May 1934 | Box 59 \ 2 Scan392 | |
| Letter from A.T. Speedometer Co. Ltd. detailing faults and resolutions for a batch of speedometers. | 31th May 1934 | Box 59 \ 2 Scan393 | |
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