| Description | Date | Identifier | |
| Request to fit lighter type A.T. speed indicator drive cables to specific cars. | 17th Nov 1937 | Box 165 \ 2 img138 | |
| The return of two different Jaeger speedometers to the A.T. Speedometer Co. | 17th Nov 1937 | Box 165 \ 2 img139 | |
| Letter to AC. Sphinx Sparking Plug Co. regarding a revised specification for a rev-counter. | 17th Nov 1937 | Box 165 \ 2 img140 | |
| Ordering of new speedometers and rev counters for the Bentley 'M' series due to dissatisfaction with the current AC instruments. | 20th Nov 1937 | Box 165 \ 2 img141 | |
| Requesting the fitting of lighter A.T. speedometer drive cables to cars 32-EX and 39-EX. | 20th Nov 1937 | Box 165 \ 2 img142 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. requesting a custom speedometer and rev-counter for experimental Bentley cars. | 23th Nov 1937 | Box 165 \ 2 img143 | |
| Letter from AC-Sphinx regarding speedometer gearing, a new worm and wheel combination, and disassembly for examination. | 25th Nov 1937 | Box 165 \ 2 img144 | |
| Continuation sheet from the AC-Sphinx Sparking Plug Co. Ltd. about a drive test and mileage recording error. | 29th Nov 1937 | Box 165 \ 2 img145 | |
| Letter to AC-Sphinx Sparking Plug Co.Ltd. regarding experimental speedometers and rev-counters. | 29th Nov 1937 | Box 165 \ 2 img146 | |
| Speedometer calibration calculations due to changes in tyre dimensions for Wraith and New Series Bentley cars. | 11th Dec 1937 | Box 165 \ 2 img147 | |
| Testing and approval of an over-running indicator in an A.T. rev-counter for fitment to a Bentley chassis. | 21th Dec 1937 | Box 165 \ 2 img148 | |
| Revised specification for a rev counter to commence on the Bentley 'M' Series. | 7th Jan 1938 | Box 165 \ 2 img149 | |
| Specification document for a revolution counter, detailing performance and testing criteria. | 7th Jan 1938 | Box 165 \ 2 img150 | |
| Specification for checking an instrument's Hasler reading between set r.p.m. values. | 17th Jan 1938 | Box 165 \ 2 img151 | |
| Letter from S. Smith & Sons regarding the despatch of a sample speedometer and clock, and issues with the speedometer case. | 17th Jan 1938 | Box 165 \ 2 img152 | |
| Providing speedometer ordering particulars for a Bentley III. | 27th Jan 1938 | Box 165 \ 2 img153 | |
| The ordering of a speedometer for a Bentley III, providing specifications for tyre size, circumference, and axle ratio. | 27th Jan 1938 | Box 165 \ 2 img154 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. regarding revs-per-mile calibration for instruments and a missing speedometer adaptor. | 3rd Feb 1938 | Box 165 \ 2 img155 | |
| Investigation into wiring faults on a Bentley owned by Mr. Crittall following a visit to Kingsbury. | 4th Feb 1938 | Box 165 \ 2 img156 | |
| Customer's recurring issue with a blown headlamp bulb due to vibration. | 4th Feb 1938 | Box 165 \ 2 img157 | |
| Letter to Messrs S.Smith & Sons regarding a faulty rev. counter with a broken screw. | 4th Feb 1938 | Box 165 \ 2 img158 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. regarding the re-working of instruments and speedometer drive cables. | 10th Feb 1938 | Box 165 \ 2 img159 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. clarifying specifications for four pairs of instruments. | 25th Feb 1938 | Box 165 \ 2 img160 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. regarding the supply and modification of concave dial instruments. | 25th Feb 1938 | Box 165 \ 2 img161 | |
| Cost and accuracy implications of a proposal for standardized speedometer drives with a common gearbox. | 26th Feb 1938 | Box 165 \ 2 img162 | |
| Requesting the return of a flexible speedometer drive to the AC Sphinx Sparking Plug Co. for modification. | 1st Mar 1938 | Box 165 \ 2 img163 | |
| Requesting the forwarding of a flexible speedometer drive for modification. | 2nd Mar 1938 | Box 165 \ 2 img164 | |
| The alteration of speedometer axle ratios for Bentley 'M' Series and Wraith chassis. | 17th Mar 1938 | Box 165 \ 2 img165 | |
| Letter from a supplier discussing changes to speedometer r.p.m. specifications and the associated production costs. | 12th Mar 1938 | Box 165 \ 2 img166 | |
| Telephone message regarding the failure of two speedometer total mileage recorders for a Bentley III. | 23th Mar 1938 | Box 165 \ 2 img167 | |
| Requesting the recalibration of a speedometer for Wraith car 28.G.VI due to a change in the rear axle ratio. | 31th Mar 1938 | Box 165 \ 2 img168 | |
| Requesting the recalibration of a Wraith III speedometer to suit new axle gears. | 1st Apr 1938 | Box 165 \ 2 img169 | |
| Faulty A.C. speedometer which was returned damaged and needs to be sent back again. | 8th Apr 1938 | Box 165 \ 2 img170 | |
| Damaged A.C. speedometer that needs to be returned and made operational. | 12th Apr 1938 | Box 165 \ 2 img171 | |
| Noisy speedometer drives and the delayed implementation of a modification on the Phantom III experimental car. | 14th Apr 1938 | Box 165 \ 2 img172 | |
| Modifications to the speedometer drive gears to correct an undercut issue. | 20th Apr 1938 | Box 165 \ 2 img173 | |
| Speedometer recalibration for car 25.G.VI due to a rear axle change. | 3rd May 1938 | Box 165 \ 2 img174 | |
| Requesting speedometer recalibration following a change in the rear axle ratio. | 6th May 1938 | Box 165 \ 2 img175 | |
| Requesting the return of a faulty AC speedometer to the makers for a complete overhaul. | 1st Jun 1938 | Box 165 \ 2 img176 | |
| Letter to AC Sphinx Sparking Plug Co. Ltd. regarding the failure of a speedometer during an endurance test. | 1st Jun 1938 | Box 165 \ 2 img177 | |
| Requesting the return of a Wraith speedometer for recalibration due to a new rear axle ratio. | 16th Jun 1938 | Box 165 \ 2 img178 | |
| The re-calibration of a Wraith speedometer to suit a new rear axle ratio. | 17th Jun 1938 | Box 165 \ 2 img179 | |
| Faulty A.T. rev-counter removed from car 7.B.V. | 18th Oct 1938 | Box 165 \ 2 img180 | |
| Request to despatch a speedometer for car 8.B.5 to France, calibrated for a 9:37 axle ratio. | 26th Oct 1938 | Box 165 \ 2 img181 | |
| Request for a covering order for a speedometer for chassis 8.B.V. following a gearbox change. | 27th Oct 1938 | Box 165 \ 2 img182 | |
| Record of blueprints for a speedometer fitted to the instrument board of Chassis 8.B.V. | 7th Nov 1938 | Box 165 \ 2 img183 | |
| Damaged speedometer from a Bentley car. | 9th Dec 1938 | Box 165 \ 2 img184 | |
| Instruction to despatch a speedometer for repair to A.T. Speedometer Co. Ltd. | 12th Dec 1938 | Box 165 \ 2 img185 | |
| The required speedometer calibration based on the effective circumference of new tyres. | 15th Dec 1938 | Box 165 \ 2 img186 | |
| Replacement of an unsatisfactory curved speedometer glass with a flat one for car 9.B.V. | 4th Jan 1939 | Box 165 \ 2 img187 | |
| Dispatch request for a speedometer to be fitted with flat glass for chassis 9-B-V. | 5th Jan 1939 | Box 165 \ 2 img188 | |
| New procedure for fitting speedometers to experimental cars by The A.T. Speedometer Co. Ltd. | 11th Jan 1939 | Box 165 \ 2 img189 | |
| Internal memorandum regarding speedometer calibration and fitting for Bentley 11 & 12.B.V. instruments. | 3rd May 1939 | Box 165 \ 2 img190 | |
| Request to recalibrate the speedometer and check the hodometer for car 3.B.50 due to a change in the rear axle ratio. | 6th May 1939 | Box 165 \ 2 img191 | |
| Requesting the recalibration of a speedometer for a Bentley Car 3.B.50 due to a change in the rear axle ratio. | 9th May 1939 | Box 165 \ 2 img192 | |
| Confirming the delivery of eight 8ft. Speedometer and Revolution Counter Drives. | 10th May 1939 | Box 165 \ 2 img193 | |
| New speedometer specifications for the Bentley V model. | 24th May 1939 | Box 165 \ 2 img194 | |
| Speedometer calibration specifications for Bentley vehicles with different axle ratios. | 24th May 1939 | Box 165 \ 2 img195 | |
| Confirming the arrangement to calibrate speedometer dials for various chassis series. | 25th May 1939 | Box 165 \ 2 img196 | |
| Request for tyre data in order to place an order for a speedometer for car 4.B.50. | 7th Jun 1939 | Box 165 \ 2 img197 | |
| Requesting the recalibration of a speedometer for car 11.B.V due to a rear axle ratio change. | 9th Jun 1939 | Box 165 \ 2 img198 | |
| Request to forward a speedometer to suppliers for recalibration due to a rear axle change. | 13th Jun 1939 | Box 165 \ 2 img199 | |
| Urgent request for speedometer recalibration and a new dial due to a changed rear axle ratio on car 30.G.VII. | 15th Jun 1939 | Box 165 \ 2 img200 | |
| Clarifying the specification number for 'D' Series Wraith speedometers. | 15th Jun 1939 | Box 165 \ 2 img201 | |
| Notification for a new Test Specification for Wraith III 'D' Series speedometers. | 15th Jun 1939 | Box 165 \ 2 img202 | |
| Specification for Wraith III speedometers, detailing scale calibration and testing parameters. | 15th Jun 1939 | Box 165 \ 2 img203 | |
| Urgent memo requesting the speedometer recalibration for car 14.B.V. due to a rear axle ratio change. | 29th Jun 1939 | Box 165 \ 2 img204 | |
| Damaged speedometer to be sent to the makers for repair. | 11th Jul 1939 | Box 165 \ 2 img205 | |
| The dispatch of a replacement speedometer for a car undergoing testing in France. | 18th Jul 1939 | Box 165 \ 2 img206 | |
| Speedometer change for car 14.B.V. due to a modified axle ratio. | 1st Sep 1939 | Box 165 \ 2 img207 | |
| Requesting the recalibration of speedometers for two experimental cars due to changes in their rear axle ratios. | 27th Nov 1939 | Box 165 \ 2 img208 | |
| Arranging for the return of three speedometer drives to the A.T. Speedometer Co. | 7th Dec 1939 | Box 165 \ 2 img209 | |
| Instruction to arrange for the return of three speedometer drives to the A.T. Speedometer Co. | 7th Dec 1939 | Box 165 \ 2 img210 | |
| Letter to A.T. Speedometer Co. Ltd. about a faulty speedometer drive cable causing pointer oscillation. | 7th Dec 1939 | Box 165 \ 2 img211 | |
| Correspondence requesting examination of a drive and the manufacture of a new eight-foot length to drawing DB.2155. | 7th Dec 1939 | Box 165 \ 2 img212 | |
| Letter requesting a sample of right-angle fitments for a rev counter drive, referencing an enclosed drawing. | 13th Dec 1939 | Box 165 \ 2 img213 | |
| Letter from S. Smith & Sons to W.A. Robotham confirming a suitable 'drive' is in stock and being sent. | 15th Dec 1939 | Box 165 \ 2 img214 | |
| The return of three speedometer drives to the A.T. Speedometer Co. | 7th Dec 1939 | Box 165 \ 2 img215 | |
| Faulty speedometer for car 4.B.50, requesting its return for correction after a failed re-calibration. | 20th Dec 1939 | Box 165 \ 2 img216 | |
| Request to A.T. Speedometer Co. Ltd. for a sample instrument incorporating a new indirect lighting scheme. | 9th Jan 1940 | Box 165 \ 2 img217 | |
| Letter from A.T. Speedometer Co., Ltd. arranging to submit a sample instrument panel for examination and comment. | 15th Jan 1940 | Box 165 \ 2 img218 | |
| Specifying the details for a speedometer required for car 31.G.VII. | 15th Jan 1940 | Box 165 \ 2 img219 | |
| Letter from S. Smith & Sons regarding a replacement electric clock and new instrument samples. | 30th Jan 1940 | Box 165 \ 2 img220 | |
| Letter from S. Smith & Sons discussing the performance of an electric clock and a new series of instruments. | 19th Jan 1940 | Box 165 \ 2 img221 | |
| Letter from S. Smith & Sons arranging a visit from Mr. Grose to discuss a heater. | 19th Jan 1940 | Box 165 \ 2 img222 | |
| Letter from A.T. Speedometer Co. Ltd. regarding a complaint about electric clocks gaining time and a new lighting scheme for instruments. | 2nd Feb 1940 | Box 165 \ 2 img223 | |
| Letter from S. Smith & Sons regarding a loose broken screw found inside a revolution counter. | 14th Feb 1938 | Box 165 \ 2 img224 | |
| Letter to A.T. Speedometer Co. Ltd. regarding the return of an 8 ft. drive for modification. | 23th Feb 1940 | Box 165 \ 2 img225 | |
| Request to return an 8 ft. DRIVE to A.T. Speedometer Co. Ltd. for modification of the end fittings. | 23th Feb 1940 | Box 165 \ 2 img226 | |
| Despatch note for an 8 ft. flexible drive to be sent to the A.T. Speedometer Co. Ltd. for modification. | 24th Feb 1940 | Box 165 \ 2 img227 | |
| Letter to A.T. Speedometer Co. Ltd. chasing the delivery of instruments with M.G. type interior lighting. | 5th Mar 1940 | Box 165 \ 2 img228 | |
| Noise made by the rev-counter drives on experimental cars, requesting a report on the permanence of a proposed cure. | 15th Mar 1940 | Box 165 \ 2 img229 | |
| Noise from rev-counter drives on experimental cars, particularly in cold weather. | 15th Mar 1940 | Box 165 \ 2 img230 | |
| Correspondence from S. Smith & Sons regarding a failed speedometer trip recorder and the performance of electric clocks. | 2nd Apr 1940 | Box 165 \ 2 img231 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd to W.A. Robotham inquiring about a missing instrument. | 8th Apr 1940 | Box 165 \ 2 img232 | |
| Alteration to a Speedo Drive, replacing a cover spring valve to prevent the unit from moving. | 9th Apr 1940 | Box 165 \ 2 img233 | |
| Request to remove a noisy and erratic speedometer and drive from car 1-R-1 for laboratory testing. | 9th Apr 1940 | Box 165 \ 2 img234 | |
| Requesting the removal of a noisy and erratic speedometer and drive from car 1-R-1 for examination. | 9th Apr 1940 | Box 165 \ 2 img235 | |
| Requesting the return of a speedometer to the A.T. Speedometer Co., Ltd. | 16th Apr 1940 | Box 165 \ 2 img236 | |
| Despatching a speedometer for examination to A.T. Speedometer Co., Ltd. | 16th Apr 1940 | Box 165 \ 2 img237 | |
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