| Description | Date | Identifier | |
| Page 2 of a memorandum discussing the use of a three-point switch for a Smith machine with an existing switchboard. | 9th Apr 1920 | Box 3 \ 5 05-page214 | |
| Letter from S. Smith & Sons acknowledging receipt of a communication regarding a chassis lighting dynamo. | 9th Apr 1920 | Box 3 \ 5 05-page215 | |
| The receipt of a Smith dynamo for testing. | 11th Apr 1920 | Box 3 \ 5 05-page216 | |
| Manufacture of a new switchboard for a Smith dynamo. | 12th Apr 1920 | Box 3 \ 5 05-page217 | |
| The air gap for the Smith 2D dynamo. | 16th Apr 1920 | Box 3 \ 5 05-page218 | |
| Letter to Messrs. S. Smith & Sons, Ltd. requesting a replacement blueprint for a dynamo Type 2D which has been mislaid. | 19th Apr 1920 | Box 3 \ 5 05-page219 | |
| Requesting a replacement outline for a Smith Dynamo that could not be found. | 1st Apr 1920 | Box 3 \ 5 05-page220 | |
| Letter from a motor accessories manufacturer enclosing blueprints for the external dimensions of a Model 2b Dynamo. | 21th Apr 1920 | Box 3 \ 5 05-page221 | |
| The design of a cut-out for a Smith Dynamo and component selection for chassis 1001 to 1600. | 23th Apr 1920 | Box 3 \ 5 05-page222 | |
| Letter to S. Smith & Sons, Ltd. enquiring about the progress of two special chassis lighting dynamos. | 3rd May 1920 | Box 3 \ 5 05-page223 | |
| Design of an R-R cut-out for a Smith dynamo and potential delays. | 3rd May 1920 | Box 3 \ 5 05-page224 | |
| Letter from S. Smith & Sons regarding the dispatch of a sample dynamo and an upcoming order. | 4th May 1920 | Box 3 \ 5 05-page225 | |
| Letter from S. Smith & Sons regarding the shipment of a Model 2D Dynamo for testing. | 4th May 1920 | Box 3 \ 5 05-page226 | |
| Automatic dynamo switch, advising to use a Lucas fitting for testing due to incomplete drawings of the R.R. device. | 5th May 1920 | Box 3 \ 5 05-page227 | |
| The testing and redesign of dynamo cut-outs. | 8th May 1920 | Box 3 \ 5 05-page228 | |
| Distribution board suitable for both Lucas and Smith dynamos. | 10th May 1920 | Box 3 \ 5 05-page229 | |
| Letter to S. Smith & Sons Ltd. regarding the testing of a sample 2D dynamo and requesting a second machine. | 10th May 1920 | Box 3 \ 5 05-page230 | |
| The receipt of springs from G. Salter & Co. and a sample dynamo from S. Smith & Sons, with the spring entries crossed out. | 10th May 1920 | Box 3 \ 5 05-page231 | |
| Letter from S. Smith & Sons regarding the receipt of Dynamo No.1438 and the dispatch of a second machine. | 11th May 1914 | Box 3 \ 5 05-page232 | |
| Letter to S. Smith & Sons, Ltd. regarding the return of a model 2D dynamo and the retention of a cut-out. | 12th May 1920 | Box 3 \ 5 05-page233 | |
| To the Shipping Office regarding the return of a loaned Smith dynamo and its replacement. | 12th May 1920 | Box 3 \ 5 05-page234 | |
| Specification sheet comparing Type A and Type 3A Smith (T & M) 12 Volt chassis dynamos. | 12th May 1919 | Box 3 \ 5 05-page235 | |
| Test results for a Smith 'A' dynamo with brushes in the normal (fully hot) position. | 14th Jun 1920 | Box 3 \ 5 05-page236 | |
| Test results table for Speed, Amps, and Volts with 'Brushes fully Back'. | 26th Jan 1919 | Box 3 \ 5 05-page237 | |
| Test sheet recording speed, amperage, and voltage readings with 'brushes fully forward'. | 24th May 1919 | Box 3 \ 5 05-page238 | |
| Instruction sheet recording speed, ampere, and voltage measurements after adjusting brushes. | 24th Jan 1939 | Box 3 \ 5 05-page239 | |
| Instructions for fitting a modified Smith dynamo to an experimental car, noting wiring and polarity changes. | 17th May 1920 | Box 3 \ 5 05-page240 | |
| Instructions for modifying dynamo polarity markings and connections for new wiring and a side-entry switchbox. | 17th May 1920 | Box 3 \ 5 05-page241 | |
| Letter from S. Smith & Sons acknowledging an order and advising that the requested dynamo is in transit. | 17th May 1922 | Box 3 \ 5 05-page242 | |
| Instruction sheet with test results for a Smith Dynamo Type 29 2D(I) at 17°C. | 17th May 1920 | Box 3 \ 5 05-page243 | |
| Instruction sheet with performance data for a Smith Dynamo Type 2D(2). | 17th May 1920 | Box 3 \ 5 05-page244 | |
| Test results for a Smith Dynamo 2D(2) cut-out put under cold conditions. | 18th May 1920 | Box 3 \ 5 05-page245 | |
| Instruction and test data sheet recording Speed, Amperes, and Volts. | 24th Jan 1919 | Box 3 \ 5 05-page246 | |
| To Mr Clark from O.O. listing the receipt of various parts from suppliers. | 18th May 1920 | Box 3 \ 5 05-page247 | |
| Request for 7 photostat copies of a sheet of curves for a Smith Type A Dynamo. | 19th May 1920 | Box 3 \ 5 05-page248 | |
| The performance curves of a Smith Dynamo, detailing the effect of brush position variation on output. | 19th May 1920 | Box 3 \ 5 05-page249 | |
| Note on obtaining performance curves and adjusting the output for Lucas dynamos. | 19th May 1920 | Box 3 \ 5 05-page250 | |
| Performance graph showing the effect of brush position on the output of a Smith Type A Dynamo. | 11th Jun 1920 | Box 3 \ 5 05-page251 | |
| Instruction sheet detailing test results for a Smith 2.D(2) dynamo, recording voltage output at different speeds. | 20th May 1920 | Box 3 \ 5 05-page252 | |
| Instructions and test results for a Smiths dynamo output under cold conditions. | 21th May 1920 | Box 3 \ 5 05-page253 | |
| Instruction sheet showing performance data for a Smith Dynamo under cold conditions. | 31th May 1920 | Box 3 \ 5 05-page254 | |
| Instruction sheet showing test results for Speed, Amperes, and Volts. | 26th Jan 1919 | Box 3 \ 5 05-page255 | |
| Test results for a Smith Dynamo showing output Amperes and Volts at various speeds. | 19th May 1920 | Box 3 \ 5 05-page256 | |
| Instruction sheet recording speed, amperes, and volts test data. | 1st Dec 1935 | Box 3 \ 5 05-page257 | |
| Instruction sheet comparing the electrical and mechanical performance of different Smith Dynamos models. | 21th May 1920 | Box 3 \ 5 05-page258 | |
| Instructions regarding the electrical performance of a dynamo to be fitted to a car. | 25th May 1920 | Box 3 \ 5 05-page259 | |
| Letter from S. Smith & Sons confirming receipt of a Model 2D Dynamo. | 25th May 1920 | Box 3 \ 5 05-page260 | |
| Correspondence from S. Smith & Sons regarding a returned Model.2D Dynamo and test results for magnetic hum. | 28th May 1920 | Box 3 \ 5 05-page261 | |
| List of new parts fitted to the new 6.EX car, which is replacing the 1.EX car. | 28th May 1920 | Box 3 \ 5 05-page262 | |
| Unreliability of the Lucas C.575 Dynamo and considering its replacement with a Smith dynamo. | 31th May 1920 | Box 3 \ 5 05-page263 | |
| Instruction sheet providing the weight of a Smith DD dynamo armature, complete less pulley. | 24th Jan 1919 | Box 3 \ 5 05-page264 | |
| The known faults with the electrical equipment for the 40/50 chassis. | 7th Jun 1921 | Box 3 \ 5 05-page265 | |
| Report comparing the reliability of Delco and Smith electrical components against Lucas, based on tests conducted on a Marmon car. | 7th Jun 1921 | Box 3 \ 5 05-page266 | |
| On the delay of essential improvements due to a reduction in output and the problem of shipping cars with known faults. | 7th Jun 1921 | Box 3 \ 5 05-page267 | |
| Announcement and proposed production schedule for the 3.5 Litre Bentley. | 8th Aug 1933 | Box 3 \ 6 06-page001 | |
| Practicality of bucket seats versus luggage space in an experimental Bentley car. | 14th Aug 1933 | Box 3 \ 6 06-page002 | |
| The results of wind tunnel tests at Vickers on a 3 Litre Bentley, comparing a new aerodynamic model with the standard saloon. | 3rd Jun 1933 | Box 3 \ 6 06-page003 | |
| Tests to increase Bentport engine power output by modifying cylinder barrels, inlet valves, and compression ratios. | 8th May 1933 | Box 3 \ 6 06-page004 | |
| Power output graph for a Bentley engine, plotting BHP and BMEP against RPM under different configurations. | 2nd Aug 1933 | Box 3 \ 6 06-page005 | |
| Breaking axle tube on a Bentley and the potential involvement of Geoffrey Smith for publicity photos. | 11th Aug 1933 | Box 3 \ 6 06-page006 | |
| Issues found after testing the first 15 Bentley chassis which require attention. | 11th Aug 1933 | Box 3 \ 6 06-page007 | |
| List of observations and potential issues regarding gearbox clearance, bonnet louvres, radiator tanks, and tyres. | 11th Aug 1933 | Box 3 \ 6 06-page008 | |
| Acceleration performance figures for a Bentley with 11/43 and 10x41 axles. | 21th Aug 1933 | Box 3 \ 6 06-page009 | |
| Meeting notes concerning the appearance of the Bentley 3.5 Litre, focusing on bonnet length and headlamps. | 22th Aug 1931 | Box 3 \ 6 06-page010 | |
| The approval and design specifications for a horn, comparing it to the one on the Continental Phantom II. | 22th Aug 1933 | Box 3 \ 6 06-page011 | |
| Electrical equipment for the Bentley chassis, specifically the positioning of the stop lamp switch. | 25th Aug 1933 | Box 3 \ 6 06-page012 | |
| Instructions for coachbuilders regarding the wiring of body lights, cigar lighters, direction indicators, and headlamps. | 25th Aug 1933 | Box 3 \ 6 06-page013 | |
| Modifications to horns and tail lamps for 15 cars, including fittings for continental use. | 25th Aug 1933 | Box 3 \ 6 06-page014 | |
| Proposing a conference to address dissatisfaction with the appearance of the 3 1/2 Litre car. | 25th Aug 1933 | Box 3 \ 6 06-page015 | |
| Criticism of the new Bentley chassis's radiator appearance and the need for improvement. | 24th Aug 1933 | Box 3 \ 6 06-page016 | |
| The radiator shell shape, shutters, bonnet length, and material thickness. | 24th Aug 1933 | Box 3 \ 6 06-page017 | |
| Cover memo regarding Bentley Appearance, forwarding copies of correspondence. | 28th Aug 1933 | Box 3 \ 6 06-page018 | |
| Letter from Wm. Cowen to Mr. Wormald regarding the appearance of a Bentley and discussing design feedback from Jack Barclay. | 25th Aug 1933 | Box 3 \ 6 06-page019 | |
| Letter to Jack Barclay Ltd responding to criticisms of the Bentley 3½ Litre Car, specifically concerning the radiator, wheel caps, and magneto. | 25th Aug 1933 | Box 3 \ 6 06-page020 | |
| Letter from Jack Barclay Ltd. to Bentley Motors with suggestions for improving the new Bentley car. | 24th Aug 1933 | Box 3 \ 6 06-page021 | |
| Piston and crankshaft failures during a high-speed endurance test of a Bentley Unit C.13. | 26th Aug 1933 | Box 3 \ 6 06-page022 | |
| No.6 balance weight failure on the No.4 journal which came through the crankcase. | 8th Aug 1933 | Box 3 \ 6 06-page023 | |
| Blueprint detailing a Bentley piston failure, showing a crack and dimensional data. | 29th Aug 1939 | Box 3 \ 6 06-page024 | |
| Modifications to the Bentley's radiator and front apron to improve its appearance. | 26th Aug 1933 | Box 3 \ 6 06-page025 | |
| The Bentley radiator design, its similarity to other cars, and the potential for a distinctive mascot. | 26th Aug 1933 | Box 3 \ 6 06-page026 | |
| Halting the production of tools for specific parts due to criticism from the Sales department. | 28th Aug 1933 | Box 3 \ 6 06-page027 | |
| Letter to Mr. Wormald correcting a typist's error regarding the preferred type of wheel for a Bentley. | 28th Aug 1933 | Box 3 \ 6 06-page028 | |
| Urgent receipt of lamps and horns for a Bentley programme. | 30th Aug 1933 | Box 3 \ 6 06-page029 | |
| Summarising feedback from a test drive of a Bentley car, with further critical points to be considered. | 1st Sep 1933 | Box 3 \ 6 06-page030 | |
| Letter from Pass & Joyce Ltd. to Bentley Motors (1931) Ltd. providing feedback and suggestions on a new Bentley car following a test run. | 1st Sep 1933 | Box 3 \ 6 06-page031 | |
| Unsatisfactory performance of the Bentley ignition tower due to wear and slackness, and proposing potential improvements. | 5th Sep 1933 | Box 3 \ 6 06-page032 | |
| Technical drawing illustrating wear patterns on a tower bearing assembly under load. | 13th Sep 1933 | Box 3 \ 6 06-page033 | |
| Bentley car piston failures, test results, and the decision to proceed with production. | 13th Sep 1933 | Box 3 \ 6 06-page034 | |
| List of modifications for the 3 1/2 Litre Bentley car after running 10,000 miles. | 13th Sep 1933 | Box 3 \ 6 06-page035 | |
| Specification sheet detailing modifications for various vehicle components. | 13th Sep 1933 | Box 3 \ 6 06-page036 | |
| Test results for a Bentley petrol feed system on chassis 4.B.IV at Brooklands. | 16th Sep 1933 | Box 3 \ 6 06-page037 | |
| Modifications to a Bentley's dumb iron covers and petrol pipe junction bracket. | 18th Sep 1933 | Box 3 \ 6 06-page038 | |
| Confirming modifications to 15 Bentley chassis. | 18th Sep 1933 | Box 3 \ 6 06-page039 | |
| Performance figures including braking, acceleration, and weights for the 3½ Litre Bentley. | 21th Sep 1933 | Box 3 \ 6 06-page040 | |
| Letter proposing a visit to discuss development work on a 4-litre 6-cylinder Bentley engine. | 28th Sep 1933 | Box 3 \ 6 06-page041 | |
| List of proposed modifications for the 3½ Litre Bentley Chassis. | 26th Sep 1933 | Box 3 \ 6 06-page042 | |
| Bentley acceleration performance figures for a saloon car and comparing them to a previous model. | 26th Sep 1933 | Box 3 \ 6 06-page043 | |
| Letter from Ricardo & Co. Engineers postponing a proposed visit with Mr. Ricardo. | 27th Sep 1933 | Box 3 \ 6 06-page044 | |
| Letter from the Experimental Department to O. Thornycroft of Ricardo & Co. arranging a visit to Shoreham. | 28th Sep 1933 | Box 3 \ 6 06-page045 | |
| Meeting notes and recommendations for the 3 1/4 Litre Bentley Chassis 16-200. | 28th Sep 1933 | Box 3 \ 6 06-page046 | |
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