| Description | Date | Identifier | |
| Delivery of an A.T. Speedometer for the Goshawk car to coachbuilders Hooper & Co. | 27th Feb 1922 | Box 50 \ 4 Scan016 | |
| Order request for five A.T. Speedometers for Goshawk 11 - X 4308. | 3rd Mar 1922 | Box 50 \ 4 Scan017 | |
| Telegram concerning the reduction of speedometer revolutions for a Goshawk car and related scheduling. | 14th Mar 1922 | Box 50 \ 4 Scan018 | |
| Telegram received by telephone regarding a reduction in car revolutions. | 14th Mar 1922 | Box 50 \ 4 Scan019 | |
| Telegram received by telephone regarding the modification of speedometer revolutions for Goshawk engines. | 13th Mar 1928 | Box 50 \ 4 Scan020 | |
| Calculations for speedometer revolutions per mile based on tyre diameter. | 13th Mar 1928 | Box 50 \ 4 Scan021 | |
| Calculations for speedometer revolutions per mile based on road wheel diameter and gear ratios. | 14th Mar 1920 | Box 50 \ 4 Scan022 | |
| Telegram confirming a potential change in engine revolutions from 670 to 636. | 14th Mar 1920 | Box 50 \ 4 Scan023 | |
| Cover note forwarding a copy of a letter from the A.T. Speedometer Co. | 21th Mar 1922 | Box 50 \ 4 Scan024 | |
| Letter from A.T. Speedometer Co. Ltd. concerning the calibration of different speedometer models. | 20th Mar 1922 | Box 50 \ 4 Scan025 | |
| Oil gauge and speedometer fittings for the Goshawk 11 instrument board. | 1st Jul 1922 | Box 50 \ 4 Scan026 | |
| The discolouration and deterioration of A.T. Speedometer dial plates after 6 months of use. | 24th Jul 1922 | Box 50 \ 4 Scan027 | |
| Letter from the A.T. Speedometer Company regarding discolouration on speedometer dials. | 27th Jul 1922 | Box 50 \ 4 Scan028 | |
| Letter from A.T. Speedometer Co. Ltd. regarding the discolouration of dials and the preparation of parts for the 'Goshawk' car. | 29th Jul 1922 | Box 50 \ 4 Scan029 | |
| Recurring problem of small mounting flanges on instruments, specifically the A.T. Speedometer for the Goshawk. | 10th Oct 1922 | Box 50 \ 4 Scan030 | |
| Sample of the latest A.T. Speedometer suitable for the 'Goshawk'. | 29th Nov 1922 | Box 50 \ 4 Scan031 | |
| The gear ratio and other calculations for a speedometer drive on a gearbox. | 4th Dec 1922 | Box 50 \ 4 Scan032 | |
| Issues with a sample 20HP A.T. Speedometer and the urgent need for a decision. | 27th Dec 1922 | Box 50 \ 4 Scan033 | |
| Request to order an A.T. Speedometer for car 49-GB (40/50), specifying the drive details. | 30th Dec 1922 | Box 50 \ 4 Scan034 | |
| Use of Monel metal tubes in Goshawk cylinders and requesting its coefficient of expansion. | 1st Jan 1923 | Box 50 \ 4 Scan035 | |
| Faulty speedometer returned to A.T. Speedometers Ltd and a query about replacement couplings. | 15th Jan 1923 | Box 50 \ 4 Scan036 | |
| Letter regarding a replacement speedometer and a modified flexible drive universal coupling to prevent noise. | 11th Jan 1923 | Box 50 \ 4 Scan037 | |
| Request to send a latest type A.T. Speedometer for 'Goshawk' to the Stores for inspection. | 17th Jan 1923 | Box 50 \ 4 Scan038 | |
| The supply and standardization of speedometer dials for 40/50 HP and 20 HP instruments. | 1st Feb 1923 | Box 50 \ 4 Scan039 | |
| Changing the A.T. Speedometer needle tip colour from red to white for improved night visibility. | 26th Feb 1923 | Box 50 \ 4 Scan040 | |
| Standardisation proposal for a reliable speedometer drive for the 40/50 chassis, including test reports and costings. | 21th Mar 1923 | Box 50 \ 4 Scan041 | |
| Arrangement of the A.T. Speedometer drive for the 40/50 HP chassis. | 23th Mar 1923 | Box 50 \ 4 Scan042 | |
| Faulty A.T. Speedometer which is providing a low M.P.H. reading. | 10th May 1923 | Box 50 \ 4 Scan043 | |
| Failed speedometer drive for the 4-EX car due to a worn-out bush. | 16th Apr 1923 | Box 50 \ 4 Scan044 | |
| Follow-up memo regarding the supply of gearbox drives from The A.T. Speedometer Co. Ltd. | 11th May 1923 | Box 50 \ 4 Scan045 | |
| Confirming the completion of three sets of A.T. Speedometer Drive and requesting despatch instructions. | 16th Aug 1923 | Box 50 \ 4 Scan046 | |
| Instruction sheet detailing faults with an A.T. Speedometer taken from vehicle 6.GII. | 20th Sep 1923 | Box 50 \ 4 Scan047 | |
| The despatch of an A.T. Speedometer for repair. | 21th Sep 1923 | Box 50 \ 4 Scan048 | |
| Requirement of 8 A.T. speedometers for a chassis fitted with 4-wheel brakes and 15 tooth axles. | 26th Nov 1923 | Box 50 \ 4 Scan049 | |
| Eight speedometers from demonstration cars to be sent for rectification and fitting with new driving cables. | 5th Dec 1923 | Box 50 \ 4 Scan050 | |
| Three A.T. Speedometers to be sent to the A.T. Speedometer Co. | 14th Dec 1923 | Box 50 \ 4 Scan051 | |
| Sending three A.T. speedometers to be modified to suit the EAC.111 chassis. | 24th Jan 1924 | Box 50 \ 4 Scan052 | |
| The despatch of A.T. Speedometers for correction and replacement of driving cables. | 26th Jan 1924 | Box 50 \ 4 Scan053 | |
| Two A.T. Speedometer Drives being sent to the stores for despatch to the makers for repair. | 26th Jan 1924 | Box 50 \ 4 Scan054 | |
| Requesting an order number and chassis details for the repair of two A.T. Speedometer Drives. | 30th Jan 1924 | Box 50 \ 4 Scan055 | |
| The supply of A.T. Speedometers for use on the 40/50 HP model. | 2nd Feb 1924 | Box 50 \ 4 Scan056 | |
| Returning a faulty A.T. speedometer to the makers for repair. | 2nd Feb 1924 | Box 50 \ 4 Scan057 | |
| Unreliability of English 'AT' speedometers and requesting reliable French replacements. | 9th May 1924 | Box 50 \ 4 Scan058 | |
| Case from Paris believed to contain failed speedometers and recommending an inquiry to confirm the contents. | 9th May 1924 | Box 50 \ 4 Scan059 | |
| Trial of an A.T. Speedometer Head with Trip attachment using Cobalt Magnets. | 19th Jun 1924 | Box 50 \ 4 Scan060 | |
| Letter from the A.T. Speedometer Co. Ltd discussing the Cobalt content of magnets and related tests. | 18th Jun 1924 | Box 50 \ 4 Scan061 | |
| Correspondence from A.T. Speedometer Co. Ltd. regarding the fitting of a trip instrument. | 19th Jun 1924 | Box 50 \ 4 Scan062 | |
| Approval memo for the A.T. Speedometer with Trip Record to be fitted as standard. | 30th Jun 1924 | Box 50 \ 4 Scan063 | |
| The repair of an A.T. Speedometer head from chassis 98-NK and the related customs 'passavant' document. | 14th Jul 1924 | Box 50 \ 4 Scan064 | |
| Request for a report on an A.T. Speedometer with a trip indicator for the 20 HP chassis, due to sales demand. | 19th Aug 1924 | Box 50 \ 4 Scan065 | |
| Testing an A.T. Speedometer with a trip indicator for the 20 HP car. | 21th Aug 1924 | Box 50 \ 4 Scan066 | |
| Sending an A.T. Speedometer to the makers for repair. | 9th Aug 1924 | Box 50 \ 4 Scan067 | |
| A.T. Speedometer (model de luxe) being sent to the Stores for repair. | 1st Sep 1924 | Box 50 \ 4 Scan068 | |
| Test results for A.T. Speedometer No. 12800, showing reading vs actual speed and error. | 15th Sep 1924 | Box 50 \ 4 Scan069 | |
| Follow-up letter chasing a reply regarding the return of an A.T. Speedometer head from chassis 98-NK. | 1st Sep 1924 | Box 50 \ 4 Scan070 | |
| Sending an A.T. Speedometer for repair. | 16th Dec 1924 | Box 50 \ 4 Scan071 | |
| Size constraints of an A.T. speedometer with a trip meter for a new instrument board design. | 29th Dec 1924 | Box 50 \ 4 Scan072 | |
| The return and modernization of three A.T. speedometers to suit different axle ratios. | 20th Jan 1925 | Box 50 \ 4 Scan073 | |
| Urgent request for a 90 or 100 mph speedometer for a 40/50 model car destined for France. | 2nd Feb 1925 | Box 50 \ 4 Scan074 | |
| The urgent despatch of an A.T. Speedometer and Drive to a customer in France. | 17th Feb 1925 | Box 50 \ 4 Scan075 | |
| Despatch note for a speedometer and drive for Mr. A.J. Lidsey in France. | 17th Feb 1925 | Box 50 \ 4 Scan076 | |
| Test report on the accuracy of a speedometer fitted to vehicle 44-PK. | 12th Mar 1925 | Box 50 \ 4 Scan077 | |
| New service arrangements for A.T. Speedometer instruments in Paris, with future plans for Ireland and Australia. | 28th Apr 1925 | Box 50 \ 4 Scan078 | |
| Clicking issue with A.T. Speedometer Heads and a proposed solution from the A.T. Company. | 9th Jun 1925 | Box 50 \ 4 Scan079 | |
| Letter from A.T. Speedometer Co. Ltd. concerning modifications to make instruments silent. | 8th Jun 1925 | Box 50 \ 4 Scan080 | |
| Clicking issue with A.T. Speedometer Heads and the submission of a sample for testing. | 15th Jun 1925 | Box 50 \ 4 Scan081 | |
| Letter of complaint to the A.T. Speedometer Co., Ltd. regarding recurring failures of their speedometers due to faulty design. | 17th Jul 1925 | Box 50 \ 4 Scan082 | |
| The concluding page of a letter suggesting a meeting to discuss improvements. | 17th Jul 1925 | Box 50 \ 4 Scan083 | |
| Covering letter discussing modifications to A.T. Speedometers following a visit from the company's representative. | 6th Aug 1925 | Box 50 \ 4 Scan084 | |
| Letter from A.T. Speedometer Co. Ltd. responding to a complaint about their instruments. | 27th Jul 1925 | Box 50 \ 4 Scan085 | |
| Modified speedometer and cable submitted by the A.T. Speedometer Company to fix a clicking issue. | 17th Aug 1925 | Box 50 \ 4 Scan086 | |
| Improvements to the A.T. Speedometer drive and instrument to overcome rattles. | 18th Aug 1925 | Box 50 \ 4 Scan087 | |
| Acquiring two latest design speedometers from A.T.Co. for examination of improvements. | 5th Dec 1925 | Box 50 \ 4 Scan088 | |
| Return of two A.T. Speedometers to the makers after examination. | 2nd Feb 1926 | Box 50 \ 4 Scan089 | |
| Report on two A.T. Speedometers and their improvements. | 2nd Feb 1926 | Box 50 \ 4 Scan090 | |
| Requesting a report on two A.T. Speedometers pending despatch. | 18th Feb 1926 | Box 50 \ 4 Scan091 | |
| Chasing a reply regarding the inspection of two A.T. Speedometers. | 25th Feb 1926 | Box 50 \ 4 Scan092 | |
| The testing of A.T. speedometers and a proposal to test a 20 HP version. | 25th Feb 1926 | Box 50 \ 4 Scan093 | |
| The submission and examination of a modified A.T. Speedometer. | 11th Dec 1926 | Box 50 \ 4 Scan094 | |
| Feedback and proposed improvements for an A.T. Speedometer sample, noting a design flaw and a loose glass. | 9th Dec 1926 | Box 50 \ 4 Scan095 | |
| Letter from A.T. Speedometer Co. Ltd. detailing new design features for Speedometer No. 18255. | 9th Nov 1926 | Box 50 \ 4 Scan096 | |
| Letter from A.T. Speedometer Co. Ltd. regarding new instrument details and an 8-day clock. | 9th Nov 1926 | Box 50 \ 4 Scan097 | |
| Recommendation to upgrade the four-figure mileage recorder on Phantom & 20-HP models to prevent mileage discrepancies. | 18th Dec 1926 | Box 50 \ 4 Scan098 | |
| The testing and suggested improvements for a new A.T. speedometer. | 20th Dec 1926 | Box 50 \ 4 Scan099 | |
| Inquiry to A.T. Speedometer Co. Ltd. regarding particulars of an Engine Revolution Counter. | 27th Jan 1927 | Box 50 \ 4 Scan100 | |
| Letter from A.T. Speedometer Co. Ltd. regarding the supply and cost of Revolution Counters for 40/50 or 20 HP chassis. | 28th Jan 1927 | Box 50 \ 4 Scan101 | |
| Order specifications for an A.T. Speedometer revolution counter. | 1st Feb 1927 | Box 50 \ 4 Scan102 | |
| Internal request to order a speedometer head from The A.T. Speedometer Co. | 11th Feb 1927 | Box 50 \ 4 Scan103 | |
| Order for two A.T. Speedometers for a 20 HP vehicle. | 1st Feb 1927 | Box 50 \ 4 Scan104 | |
| Complaint about an inaccurate and inconsistent revolution counter obtained from The A.T. Speedometer Co. | 1st Mar 1927 | Box 50 \ 4 Scan105 | |
| Instructing the despatch of an A.T. Speedometer for correction, with details of the car's configuration. | 9th Mar 1927 | Box 50 \ 4 Scan106 | |
| Relaying the maker's report on a faulty Revolution Counter, detailing the cause and required repairs. | 11th Mar 1927 | Box 50 \ 4 Scan107 | |
| Requesting the supply of a new outside cable casing only, not a complete cable, and acknowledging remarks on over-lubrication. | 14th Mar 1927 | Box 50 \ 4 Scan108 | |
| Instruction to repair speedometer No.16120 with vehicle configuration details. | 28th Mar 1927 | Box 50 \ 4 Scan109 | |
| Letter to H.M. Hobson Ltd. requesting a specific fuel tank gauge for a new oval section tank, with details on calibration and appearance. | 27th Apr 1927 | Box 50 \ 4 Scan110 | |
| Letter to A.T. Speedometer Co. regarding erratic speedometer readings caused by temperature changes. | 6th May 1927 | Box 50 \ 4 Scan111 | |
| Graph showing the variation in reading of an A.T. speedometer with temperature rise. | 9th May 1927 | Box 50 \ 4 Scan112 | |
| Letter from A.T. Speedometer Co. Ltd. regarding experiments and upcoming atmospheric tests on speedometers. | 9th May 1927 | Box 50 \ 4 Scan113 | |
| Letter complaining about the inaccuracy of speedometers due to temperature variation and threatening to change supplier. | 11th May 1927 | Box 50 \ 4 Scan114 | |
| Letter from A.T. Speedometer Co. Ltd. regarding temperature variation in their instruments. | 12th May 1927 | Box 50 \ 4 Scan115 | |
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