| Description | Date | Identifier | |
| Letter from The A.T. Speedometer Co. about an instrument mistakenly sent with an experimental magnet. | 1st Jun 1933 | Box 59 \ 2 Scan194 | |
| Requesting the return of a faulty A.T. speedometer and a separate broken trip trigger for repair. | 2nd Jun 1933 | Box 59 \ 2 Scan195 | |
| Request for a covering order for an A.T. Speedometer for a Bentley Chassis. | 2nd Jun 1933 | Box 59 \ 2 Scan196 | |
| Letter from A.T. Speedometer Co. confirming revs per mile instructions and despatch details, and acknowledging issues with another speedometer, No.G. 227. | 7th Jun 1933 | Box 59 \ 2 Scan197 | |
| Letter to a speedometer company regarding the incorrect calibration of a special order. | 9th Jun 1933 | Box 59 \ 2 Scan198 | |
| Letter from the A.T. Speedometer Co. regarding the examination of a faulty speedometer needle and trip spindle. | 10th Jun 1933 | Box 59 \ 2 Scan199 | |
| Short letter from The A.T. Speedometer Co., Ltd. acknowledging a letter and advising they are getting in touch with Mr. Buckley. | 12th Jun 1933 | Box 59 \ 2 Scan200 | |
| Letter from The A.T. Speedometer Co., Ltd. regarding an incorrectly calibrated speedometer. | 12th Jun 1933 | Box 59 \ 2 Scan201 | |
| The clearance of an invoice and crediting costs to a specific order. | 14th Jun 1933 | Box 59 \ 2 Scan202 | |
| Letter from The A.T. Speedometer Co. regarding a modification to a speedometer and revolution counter, enclosing a sketch for approval. | 23th Jun 1933 | Box 59 \ 2 Scan203 | |
| Letter to the A.T. Speedometer Co. Ltd. approving the calibration of a submitted dial. | 24th Jun 1933 | Box 59 \ 2 Scan204 | |
| Letter from The A.T. Speedometer Co. discussing the weight of instruments and potential reductions. | 24th Jun 1933 | Box 59 \ 2 Scan205 | |
| Letter from A. T. Speedometer Co. detailing the weights of instrument components. | 24th Jun 1933 | Box 59 \ 2 Scan206 | |
| The calibration results and issues for a Bensport speedometer. | 28th Jun 1933 | Box 59 \ 2 Scan207 | |
| Bentley speedometer and rev counter calibrations considering different tyre brands. | 1st Jul 1933 | Box 59 \ 2 Scan208 | |
| Alterations to a Bentley A.T. Speedometer. | 6th Jul 1933 | Box 59 \ 2 Scan209 | |
| Requesting the return and modification of an A.T. speedometer for a Bentley chassis. | 12th Jul 1933 | Box 59 \ 2 Scan210 | |
| Letter returning a sketch showing proposed dial markings for an A.T. Speedometer fitted to a Bentley Chassis. | 13th Jul 1933 | Box 59 \ 2 Scan211 | |
| Letter from The A.T. Speedometer Co. Ltd. regarding the layout for Bentley speedometer dials. | 14th Jul 1933 | Box 59 \ 2 Scan212 | |
| Letter from The A.T. Speedometer Co. Ltd. concerning arrangements for testing and adjusting speedometers and other instruments. | 14th Jul 1933 | Box 59 \ 2 Scan213 | |
| Continuation page of a letter from A. T. Speedometer Co., Ltd. | 20th Jul 1933 | Box 59 \ 2 Scan214 | |
| The modification and repair of A.T. speedometers and rev clocks for Bentley chassis. | 20th Jul 1933 | Box 59 \ 2 Scan215 | |
| Letter to A.T. Speedometer Co. Ltd. regarding faults found with a speedometer and a rev counter. | 20th Jul 1933 | Box 59 \ 2 Scan216 | |
| Letter detailing faults and requested modifications for a rev counter and a speedometer. | 20th Jul 1933 | Box 59 \ 2 Scan217 | |
| Request to return a speedometer, rev counter, and clock to the A.T. Speedometer Co. for correction. | 20th Jul 1933 | Box 59 \ 2 Scan218 | |
| Return of three A.T. speedometers to A.T.Co. for modification ahead of production. | 21th Jul 1933 | Box 59 \ 2 Scan219 | |
| Chasing the delivery of A.T. Speedometers to the Experimental Department. | 21th Jul 1933 | Box 59 \ 2 Scan220 | |
| Letter from The A.T. Speedometer Co. discussing improvements to the testing of Revolution Counters and Speedometers. | 26th Jul 1933 | Box 59 \ 2 Scan221 | |
| Letter from A. T. Speedometer Co., Ltd. regarding the length of Revolution Counter Cables. | 10th Aug 1933 | Box 59 \ 2 Scan222 | |
| Letter to The A.T. Speedometer Co. regarding temperature variation issues with their large dial speedometer fitted to a Bentley chassis. | 10th Aug 1933 | Box 59 \ 2 Scan223 | |
| Letter discussing speedometer dynamic balance issues and the aesthetics of instrument movement concealment. | 10th Aug 1933 | Box 59 \ 2 Scan224 | |
| Tests to show the effect of temperature on the calibration of Bentley speedometers. | 16th Aug 1933 | Box 59 \ 2 Scan225 | |
| Letter from the A.T. Speedometer Co. comparing the temperature performance of their speedometers against Smith 'Nemag' instruments for Bentley Chassis. | 16th Aug 1933 | Box 59 \ 2 Scan226 | |
| Letter from A. T. Speedometer Co. Ltd. discussing the dynamic balance and concealment of movement on their instruments. | 28th Aug 1933 | Box 59 \ 2 Scan227 | |
| Proposal to ask the A.T. Co. Ltd. to cover a hole on the speedometer dial to improve the instrument's appearance. | 28th Aug 1933 | Box 59 \ 2 Scan228 | |
| Letter to A.T. Speedometer Co. Ltd. regarding temperature-related errors in their instruments compared to Nemag. | 29th Aug 1933 | Box 59 \ 2 Scan229 | |
| Letter discussing measurements for the Bentley chassis and feedback on dynamic balance. | 30th Aug 1933 | Box 59 \ 2 Scan230 | |
| Letter from The A.T. Speedometer Co. Ltd. acknowledging receipt of correspondence. | 30th Aug 1933 | Box 59 \ 2 Scan231 | |
| A.T. Speedometer for R-R and Bentley Chassis. | 31th Aug 1933 | Box 59 \ 2 Scan232 | |
| Request to return a rev clock No. G.694 to A.T.Co. for a dial alteration. | 2nd Sep 1933 | Box 59 \ 2 Scan233 | |
| Letter to A.T. Speedometer Co. Ltd. regarding a faulty Bentley rev-clock and A.I. instrument. | 2nd Sep 1933 | Box 59 \ 2 Scan234 | |
| Letter from the A.T. Speedometer Co., Ltd. regarding the modification of instrument No. G.649. | 4th Sep 1933 | Box 59 \ 2 Scan235 | |
| Discrepancy in the red danger mark on Bentley chassis speedometers and recommending an alteration. | 19th Sep 1933 | Box 59 \ 2 Scan236 | |
| Design of the tachometer dial for a Bentley chassis, proposing a radial red line at 4500 RPM. | 20th Sep 1933 | Box 59 \ 2 Scan237 | |
| Confirming instructions will be given to the speedometer supplier for the Bentley chassis. | 20th Sep 1933 | Box 59 \ 2 Scan238 | |
| Clarifying that a previous memo should have referred to rev. counters, not speedometers, for a Bentley chassis. | 23th Sep 1933 | Box 59 \ 2 Scan239 | |
| Letter discussing three design suggestions for a red line on a rev-clock dial for Bentley speedometers. | 23th Sep 1933 | Box 59 \ 2 Scan240 | |
| A.T. Speedometer on a Bentley chassis, approving the design and emphasizing the clarity of its danger signal. | 25th Sep 1933 | Box 59 \ 2 Scan241 | |
| Letter to A.T. Speedometer Co. Ltd. specifying the design for a rev clock dial. | 25th Sep 1933 | Box 59 \ 2 Scan242 | |
| Letter regarding the alteration of 15 Bentley instrument dials and the dispatch of a confirmation drawing. | 26th Sep 1933 | Box 59 \ 2 Scan243 | |
| Danger mark on the A.T. speedometer for the Bentley chassis. | 26th Sep 1933 | Box 59 \ 2 Scan244 | |
| Speedometer for chassis 86-PY and communication with the A.T. Speedometer Company. | 26th Sep 1933 | Box 59 \ 2 Scan245 | |
| Letter from The A.T. Speedometer Co. Ltd. regarding the development and delay of a new speedometer instrument. | 25th Sep 1933 | Box 59 \ 2 Scan246 | |
| Letter from The A.T. Speedometer Co. Ltd regarding the use of a Jaegar type instrument versus a new light weight instrument. | 25th Sep 1933 | Box 59 \ 2 Scan247 | |
| Letter from The A.T. Speedometer Co., Ltd. regarding the layout of a sample dial and awaiting official approval. | 26th Sep 1933 | Box 59 \ 2 Scan248 | |
| Letter to the A.T. Speedometer Co. Ltd. approving a sample dial and clarifying a blueprint detail. | 27th Sep 1933 | Box 59 \ 2 Scan249 | |
| Approved dial lettering for an A.T. Speedometer on a Bentley Chassis. | 27th Sep 1933 | Box 59 \ 2 Scan250 | |
| Satisfactory lettering on an A.T. speedometer dial for a Bentley Chassis. | 2nd Oct 1933 | Box 59 \ 2 Scan251 | |
| Query regarding payment responsibility for modifying the dials of Bentley rev counters. | 9th Oct 1933 | Box 59 \ 2 Scan252 | |
| Letter arranging a visit to inspect progress on new lightened type instruments. | 10th Oct 1933 | Box 59 \ 2 Scan253 | |
| Cover note for a table of Bentley A.T. speedometer calibrations. | 10th Oct 1933 | Box 59 \ 2 Scan254 | |
| List of Bentley speedometer calibration results as determined by the Test Department. | 13th Oct 1933 | Box 59 \ 2 Scan255 | |
| Letter from a speedometer supplier regarding a new instrument, testing, and standardization. | 13th Oct 1933 | Box 59 \ 2 Scan256 | |
| Notes from an interview regarding the design and layout of a new type of speedometer. | 12th Oct 1933 | Box 59 \ 2 Scan257 | |
| Material suitability, design changes, and cost implications for new instruments. | 13th Oct 1933 | Box 59 \ 2 Scan258 | |
| Letter to The A.T. Speedometer Co. Ltd. comparing the properties of R.R.50 alloy with other alloys. | 13th Oct 1933 | Box 59 \ 2 Scan259 | |
| Letter from The A.T. Speedometer Co. regarding the manufacture of two instruments using R.R.50 material. | 14th Oct 1933 | Box 59 \ 2 Scan260 | |
| Charge for altering the dial marking on the rev. clock for a Bentley. | 14th Oct 1933 | Box 59 \ 2 Scan261 | |
| Letter to A.T. Speedometer Co. Ltd. regarding the use of R.R.50 alloy as a bearing material. | 16th Oct 1933 | Box 59 \ 2 Scan262 | |
| Letter from A.T. Speedometer Co. regarding the casting method (die-cast vs sand-cast) for R.R.50 Alloy platforms. | 17th Oct 1933 | Box 59 \ 2 Scan263 | |
| Letter to A.T. Speedometer Co. Ltd. regarding a misunderstanding about R.R.50 alloy and potential instrument improvements. | 19th Oct 1933 | Box 59 \ 2 Scan264 | |
| Charges for altering Bentley revolution indicators and querying an invoice from S. Smith & Sons. | 20th Oct 1933 | Box 59 \ 2 Scan265 | |
| Invoices from A.T. Speedometer Co. Ltd. for modifying instruments for various coachbuilders. | 19th Oct 1933 | Box 59 \ 2 Scan266 | |
| Record of modifications to A.T. Revolution Counters, listing costs and suppliers. | 19th Oct 1933 | Box 59 \ 2 Scan267 | |
| Letter from The A.T. Speedometer Co. Ltd. discussing 'Pressure Die-Casting' for R.R.50 material. | 20th Oct 1933 | Box 59 \ 2 Scan268 | |
| Letter to A.T. Speedometer Co. Ltd. regarding loose magnetic shunts on Bentley chassis instruments causing false calibration. | 26th Oct 1933 | Box 59 \ 2 Scan269 | |
| Letter from supplier A.T. Speedometer Co. Ltd. explaining why magnetic shunts in their speedometers are intentionally not fitted 'dead-tight'. | 31th Oct 1933 | Box 59 \ 2 Scan270 | |
| Letter from A. T. Speedometer Co. Ltd. regarding proposals for a new instrument lay-out. | 31th Oct 1933 | Box 59 \ 2 Scan271 | |
| Letter from The A.T. Speedometer Co., Ltd. confirming a meeting in Derby. | 2nd Nov 1933 | Box 59 \ 2 Scan272 | |
| Requesting an alteration to a Bentley A.T. speedometer's revs per mile calibration. | 3rd Nov 1933 | Box 59 \ 2 Scan273 | |
| Calibration results for a Light Weight Ben-Sports instrument at various temperatures. | 7th Nov 1933 | Box 59 \ 2 Scan274 | |
| Scale calibration data for a Bampost Rythn type A.T. Speedometer. | 14th Nov 1933 | Box 59 \ 2 Scan275 | |
| Request to correct a magazine article that incorrectly credited Smith instruments in a Bentley, instead of those from A.T. Speedometer and Jaeger. | 9th Nov 1933 | Box 59 \ 2 Scan276 | |
| Requesting an alteration to an A.T. speedometer's calibration from revs per mile to 864. | 14th Nov 1933 | Box 59 \ 2 Scan277 | |
| Letter chasing the delivery of a new lightened type Bentley Rev-clock from The A.T. Speedometer Co. Ltd. | 21th Nov 1933 | Box 59 \ 2 Scan278 | |
| Proposing a new Bentley speedometer and revolution indicator with reversed dial markings for improved readability. | 22th Nov 1933 | Box 59 \ 2 Scan279 | |
| Payment for a speedometer from a Mr. Buckland, pending the completion of tests. | 23th Nov 1933 | Box 59 \ 2 Scan280 | |
| Invoice from S. Smith & Sons for Bentley parts without a corresponding purchase order. | 20th Nov 1933 | Box 59 \ 2 Scan281 | |
| Letter from The A.T. Speedometer Co., Ltd. regarding a new Rev-Clock movement with a non-magnetic hairspring. | 24th Nov 1933 | Box 59 \ 2 Scan282 | |
| Letter from The A.T. Speedometer Co. about a new, smaller Rev-Clock being dispatched for testing. | 29th Nov 1933 | Box 59 \ 2 Scan283 | |
| Letter to the A.T. Speedometer Co. Ltd. about altering a speedometer dial to match a new rev-clock for testing on a Bentley chassis. | 30th Nov 1933 | Box 59 \ 2 Scan284 | |
| Letter from The A.T. Speedometer Co. Ltd. regarding modifications to a Rev-Clock and speedometer. | 1st Dec 1933 | Box 59 \ 2 Scan285 | |
| Request to dispatch a Bentley type Rev-clock and speedometer to the Sales Department for inspection. | 1st Dec 1933 | Box 59 \ 2 Scan286 | |
| Requesting the return of an experimental Bentley speedometer to the A.T. Speedometer Co. for alteration. | 2nd Dec 1933 | Box 59 \ 2 Scan287 | |
| Letter to A.T. Speedometer Co. Ltd. requesting a new combined M.P.H. and Kilometre per hour dial for a Bentley speedometer. | 6th Dec 1933 | Box 59 \ 2 Scan288 | |
| Confirming a special Bentley A.T. Speedometer is being returned for fitting a combined miles and kilometres per hour dial. | 8th Dec 1933 | Box 59 \ 2 Scan289 | |
| Return and calibration of a 20/25 A.T. speedometer. | 13th Dec 1933 | Box 59 \ 2 Scan290 | |
| Speedometer scale calibration report showing drive shaft RPM vs indicated and correct MPH, with percentage error. | 15th Dec 1933 | Box 59 \ 2 Scan291 | |
| Test report on a new lightened A.T. speedometer and revolution indicator for Bentley chassis. | 15th Dec 1933 | Box 59 \ 2 Scan292 | |
| The performance variation of standard speedometers, a price quote, and a proposal for road testing new instruments. | 15th Dec 1933 | Box 59 \ 2 Scan293 | |
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