| Description | Date | Identifier | |
| Failure of a Smith's Motor Type Clock during experimental testing and its return to the manufacturer. | 6th Apr 1938 | Box 164 \ 1 img185 | |
| Preliminary test report on a Smith Motor Type clock, which is not recommended for fitment due to reliability issues. | 8th Apr 1938 | Box 164 \ 1 img186 | |
| Test report on two Smith motor-type electrical clocks proposed for standardisation. | 7th Apr 1938 | Box 164 \ 1 img187 | |
| The performance, failure, and cost of car clocks under testing. | 7th Apr 1938 | Box 164 \ 1 img188 | |
| Letter concerning the timing issues and repair of two clocks returned for service. | 25th Apr 1940 | Box 164 \ 1 img189 | |
| The continual failure of electric clocks, its causes, and a proposal to revert to reliable hand-wound clocks. | 26th May 1938 | Box 164 \ 1 img190 | |
| Agreeing with a recommendation to revert from problematic electric clocks back to reliable hand-wound clocks. | 2nd Aug 1938 | Box 164 \ 1 img191 | |
| Requesting the purchase of a clock for the Conference Room. | 14th Jun 1938 | Box 164 \ 1 img192 | |
| Request to obtain a Smith's 'Derby' synchronous electric clock for the Conference Room. | 17th Jun 1938 | Box 164 \ 1 img193 | |
| Internal order for a Smith's 'Derby' model electric clock for the conference room. | 24th Jun 1938 | Box 164 \ 1 img194 | |
| Requesting the exchange of clocks on chassis B.56.BN for experimental purposes. | 27th Jun 1938 | Box 164 \ 1 img195 | |
| Letter from S. Smith & Sons regarding sample clocks and a mechanical wiper. | 30th Jun 1938 | Box 164 \ 1 img196 | |
| Letter from S. Smith & Sons regarding the cost and availability of a new Stem Wind Clock and a new design Electric Clock. | 30th Jun 1938 | Box 164 \ 1 img197 | |
| Two sample electric clocks received from Messrs. S. Smith & Sons for testing. | 28th Feb 1938 | Box 164 \ 1 img198 | |
| The road testing of two Smith Motor Type Clocks on specific cars. | 6th Jul 1938 | Box 164 \ 1 img199 | |
| Requesting instructions to fit two Smith Motor Type Clocks onto specific cars for road testing. | 6th Jul 1938 | Box 164 \ 1 img200 | |
| Fitting of experimental Smith motor-type clocks to various test cars. | 13th Jul 1938 | Box 164 \ 1 img201 | |
| Two faulty Smith electric clocks removed from experimental cars and a request for their return. | 1st Sep 1938 | Box 164 \ 1 img202 | |
| Internal request to order 12v Impulse Type Clocks from S. Smith & Sons for testing purposes. | 16th Sep 1938 | Box 164 \ 1 img203 | |
| Requesting the return of a damaged Smith Impulse type clock for repair. | 23th Sep 1938 | Box 164 \ 1 img204 | |
| Production and supply of Impulse Type Electric Clocks with A.T. Speedometer Co. | 27th Oct 1938 | Box 164 \ 1 img205 | |
| Supply, cost, and ordering of clocks for various car models, including a proposal for a new fuse. | 28th Oct 1938 | Box 164 \ 1 img206 | |
| Report summarizing the testing and performance of Smith Motor Type Electric Clocks for potential standardisation. | 28th Oct 1938 | Box 164 \ 1 img208 | |
| Test results and mileage data for several instruments, concluding with a recommendation to standardize the impulse type clock. | 28th Oct 1938 | Box 164 \ 1 img209 | |
| Confirming quantities of electric clocks to be ordered for various car series and the supply of fuses. | 3rd Nov 1938 | Box 164 \ 1 img210 | |
| Proposals for a new Impulse Clock and the replacement of faulty Empire Clocks. | 10th Nov 1938 | Box 164 \ 1 img211 | |
| Faulty experimental Smith Impulse type electric clock and a request for its return to the makers. | 3rd Apr 1939 | Box 164 \ 1 img212 | |
| The failure, testing, and history of an impulse-type clock from car 27.G.VI. | 5th Apr 1939 | Box 164 \ 1 img213 | |
| Correspondence from S. Smith & Sons regarding the replacement of a faulty electric clock due to a blown fuse. | 14th Mar 1939 | Box 164 \ 1 img214 | |
| Internal memorandum detailing the investigation into the failure of an impulse type clock, its subsequent lubrication, and test results. | 27th Apr 1939 | Box 164 \ 1 img215 | |
| Letter to S. Smith & Sons Ltd. concerning the noisy feature of an electrical clock and confirming car work will continue during hostilities. | 2nd Feb 1940 | Box 164 \ 1 img216 | |
| Letter from S. Smith & Sons regarding the performance and noise issues of various electric clocks. | 5th Feb 1940 | Box 164 \ 1 img217 | |
| Letter from S. Smith & Sons regarding the performance and investigation of clocks for Bentley cars. | 5th Feb 1940 | Box 164 \ 1 img218 | |
| Letter to Smith & Sons Ltd. discussing issues with impulse clocks and potential modifications to speedometer and tachometer drives. | 10th Feb 1940 | Box 164 \ 1 img219 | |
| Page 2 of a letter confirming the dispatch of an eight-feet length drive for modification. | 10th Feb 1940 | Box 164 \ 1 img220 | |
| Letter from A.T. Speedometer Co. Ltd. regarding the regulation of impulse clocks and modifications to drive cables. | 19th Feb 1940 | Box 164 \ 1 img221 | |
| Continuation page of a letter from A. T. Speedometer Co., Ltd. | 15th Mar 1940 | Box 164 \ 1 img222 | |
| Instruction to all testers regarding the observation of car clocks for irregularities in running and time-keeping. | 15th Mar 1940 | Box 164 \ 1 img223 | |
| Request for a record of the behaviour of electric clocks on experimental cars. | 18th Mar 1940 | Box 164 \ 1 img224 | |
| The bench and accuracy testing of Smith's motor-type electric clocks. | 29th Mar 1940 | Box 164 \ 1 img225 | |
| Procedure for observing and rectifying the accuracy of clocks in experimental cars. | 29th Mar 1940 | Box 164 \ 1 img226 | |
| Daily gain or loss in minutes for instruments on various identified cars. | 29th Mar 1940 | Box 164 \ 1 img227 | |
| Replacement of a faulty clock on car 4.B.50. | 30th Mar 1940 | Box 164 \ 1 img228 | |
| Internal memorandum regarding the return of two faulty Smiths car clocks for examination. | 9th Apr 1940 | Box 164 \ 1 img229 | |
| Letter to Messrs. Smith & Sons regarding the examination of two faulty clocks that are consistently losing time. | 9th Apr 1940 | Box 164 \ 1 img230 | |
| Arranging the despatch of two clocks to A.T. Speedometer Co. for examination and adjustment. | 10th Apr 1940 | Box 164 \ 1 img231 | |
| Letter from A.T. Speedometer Co., Ltd. discussing the performance of and supplying new instrument cables. | 25th Apr 1940 | Box 164 \ 1 img232 | |
| Letter from A.T. Speedometer Co. Ltd. regarding the cause of a waving speedometer needle due to faulty inner drive cables. | 18th Jun 1940 | Box 164 \ 1 img233 | |
| Letter from S. Smith & Sons expressing disappointment over samples brought back from America, highlighting a plastic part and a clock. | 18th Jun 1940 | Box 164 \ 1 img234 | |
| Letter from S. Smith & Sons regarding instrument samples, drawings for speedometers and gauges, and arranging a meeting. | 24th Jun 1940 | Box 164 \ 1 img235 | |
| Letter from S. Smith & Sons regarding an instrument panel design, a wireless control unit, and an electric clock. | 24th Jun 1940 | Box 164 \ 1 img236 | |
| Letter from S. Smith & Sons discussing the accuracy of an instrument, comparing an electric design to a stem-wind job. | 24th Jun 1940 | Box 164 \ 1 img237 | |
| Letter from S. Smith & Sons discussing proposals for testing electric clocks. | 1st Jul 1940 | Box 164 \ 1 img238 | |
| Letter to S. Smith & Sons Ltd. discussing the acceptable performance and accuracy for electrical clocks before batch testing. | 3rd Jul 1940 | Box 164 \ 1 img239 | |
| Letter from S. Smith & Sons regarding the trial of electric clocks on an experimental car. | 6th Jul 1940 | Box 164 \ 1 img240 | |
| Letter from S. Smith & Sons requesting a sketch for mounting clocks onto panels. | 6th Jul 1940 | Box 164 \ 1 img241 | |
| Letter to S. Smith & Sons Ltd. regarding the supply and arrangement of clocks for cars. | 12th Jul 1940 | Box 164 \ 1 img242 | |
| Letter from S. Smith & Sons regarding the supply and fitting of six electric clocks. | 15th Jul 1940 | Box 164 \ 1 img243 | |
| Letter from A.T. Speedometer Co. Ltd. regarding the dispatch of six electric clocks for mounting and inspection. | 9th Sep 1940 | Box 164 \ 1 img244 | |
| The performance testing of clocks from Arrowsmith. | 13th Sep 1940 | Box 164 \ 1 img245 | |
| Requesting the placement of clocks on a 9.B.V. test rig and in the Laboratory for performance recording. | 13th Sep 1940 | Box 164 \ 1 img246 | |
| Confirming clocks from A.T. Speedometer Co. are for free-of-charge experimental and test purposes. | 19th Sep 1940 | Box 164 \ 1 img247 | |
| Mounting of special clocks in the laboratory and the start of record keeping. | 20th Oct 1940 | Box 164 \ 1 img248 | |
| Request to obtain a Sectric clock plug and flex for an electric clock in Mr. Robotham's Derby Office. | 6th Nov 1940 | Box 164 \ 1 img249 | |
| Letter from S. Smith & Sons to W.A. Robotham regarding the safe arrival of a clock and a Dickinson Pump report. | 5th Nov 1940 | Box 164 \ 1 img250 | |
| Enquiry from S. Smith & Sons regarding the position of six electric clocks and heaters on test. | 13th Dec 1940 | Box 164 \ 1 img251 | |
| Requesting a report and photograph regarding the performance of Smith Electric Clocks on 9.B.V. | 28th Dec 1940 | Box 164 \ 1 img252 | |
| Letter discussing the testing of electric clocks and the development of car heating systems. | 6th Jan 1941 | Box 164 \ 1 img253 | |
| The 70-day test of six special motor type electric clocks provided by Messrs S. Smith & Sons. | 6th Jan 1941 | Box 164 \ 1 img254 | |
| The accuracy and reliability of various types of car clocks. | 6th Jan 1941 | Box 164 \ 1 img255 | |
| Performance chart showing the daily error of Smith Motor Type Electric Clocks on car 9 B V over approximately 65 days. | 6th Jan 1941 | Box 164 \ 1 img256 | |
| Graph charting the performance and timekeeping accuracy of Smith Electric Clocks over approximately 75 days. | 6th Jan 1941 | Box 164 \ 1 img257 | |
| Graph plotting minutes lost over a period of days for a Smith Motor Type electric clock operating at 12 volts. | 30th Jan 1939 | Box 164 \ 1 img258 | |
| Performance graph showing the daily accuracy error for Smith Motor Type Clocks tested in a lab. | 30th Jan 1939 | Box 164 \ 1 img259 | |
| Photograph of a vehicle's instrument panel and dashboard layout. | 11th Jan 1940 | Box 164 \ 1 img260 | |
| Letter from S. Smith & Sons discussing the performance and design of electric clocks and heaters. | 11th Jan 1940 | Box 164 \ 1 img262 | |
| Letter responding to requirements for a modified heater unit and arranging for a sample to be sent. | 21th Jan 1941 | Box 164 \ 1 img263 | |
| Letter to a motor accessories supplier regarding the performance of clocks and heaters. | 21th Jan 1941 | Box 164 \ 1 img264 | |
| Requesting the return of a Smith's car clock from a Studebaker to the makers for repair. | 18th Jul 1941 | Box 164 \ 1 img265 | |
| Results of a battery life test. | 7th Nov 1940 | Box 164 \ 1 img266 | |
| Letter from a supplier confirming a battery order error and arranging replacements. | 8th Dec 1941 | Box 164 \ 1 img267 | |
| Details and specifications of a Heinkel bomber battery seen at R.A.E. South Farnborough. | 9th Feb 1940 | Box 164 \ 1 img268 | |
| Blueprint showing the wiring layout for a battery and main switch. | 18th May 1940 | Box 164 \ 1 img269 | |
| Request to replace an obsolete battery and box on car 25.G.VI with a standard Wraith unit. | 4th Jan 1939 | Box 164 \ 2 img001 | |
| Letter from the Experimental Department regarding the renewal of a car battery's electrolyte after five years of service. | 1st Feb 1939 | Box 164 \ 2 img002 | |
| Letter from accumulator manufacturers Peto & Radford concerning a report on an experimental battery. | 13th Feb 1939 | Box 164 \ 2 img003 | |
| Special 12-volt battery fitted to Mr. Minchin's car. | 10th Feb 1939 | Box 164 \ 2 img004 | |
| Analysis of battery plate condition and growth after 3 years and 8 months of service. | 1st Dec 1938 | Box 164 \ 2 img005 | |
| Technical report on car battery performance, discussing positive plate growth, cell design, and testing of composite batteries. | 1st Apr 1939 | Box 164 \ 2 img006 | |
| Letter from Tungstone Products Ltd. discussing the specifications and alternative constructions of a battery. | 1st Apr 1939 | Box 164 \ 2 img007 | |
| Tests and disadvantages of Rubtex paint for battery boxes. | 5th Apr 1939 | Box 164 \ 2 img008 | |
| The Phantom III box and the decision not to use it on the Phantom car. | 5th Apr 1939 | Box 164 \ 2 img009 | |
| Letter to Tungstone Products Ltd. concerning the testing of a 60 amp-hour Tungstone accumulator. | 5th Apr 1939 | Box 164 \ 2 img010 | |
| Replacement battery for car 27.G.VI due to a faulty cell. | 6th Jun 1939 | Box 164 \ 2 img011 | |
| Battery mounting scheme for the Silver Dawn 33.G.Vll, comparing it to other models. | 14th Jul 1939 | Box 164 \ 2 img013 | |
| Letter to the Dagenite Battery Co. Ltd. regarding a premature failure of a 6HZD9-S type battery. | 23th Sep 1939 | Box 164 \ 2 img014 | |
| Letter from Peto & Radford regarding the return of a 6.HZD.9-S battery for examination. | 26th Sep 1939 | Box 164 \ 2 img015 | |
| Request to arrange for the return of a poorly performing Peto & Radford battery to the manufacturer for inspection. | 29th Sep 1939 | Box 164 \ 2 img016 | |
| Letter to Peto & Radford Ltd. regarding the return of a faulty battery. | 29th Sep 1939 | Box 164 \ 2 img017 | |
| Requesting the hand over of a battery for return to the supplier. | 5th Oct 1939 | Box 164 \ 2 img018 | |
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