| Description | Date | Identifier | |
| Design, layout, and illumination of a proposed combination instrument group for RR and Bentley chassis. | 1st Aug 1934 | Box 62 \ 2 scan0317 | |
| Providing an independent switch for instrument illumination, referencing Graham Paige and Pontiac cars. | 1st Aug 1934 | Box 62 \ 2 scan0318 | |
| Letter from the Sales Director's office regarding the availability of a 'Rolls-Bentley'. | 8th Aug 1934 | Box 62 \ 2 scan0319 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd to H. E. West regarding a recent visit. | 6th Sep 1934 | Box 62 \ 2 scan0320 | |
| Letter from S. Smith & Sons regarding instrument panel modifications, supply delays, and instrument failure. | 6th Sep 1934 | Box 62 \ 2 scan0321 | |
| Drawing for a combined instrument patch and its potential modification. | 8th Sep 1934 | Box 62 \ 2 scan0322 | |
| Instruction to despatch a combined instrument patch to Messrs. S. Smith & Sons Ltd. | 10th Sep 1934 | Box 62 \ 2 scan0323 | |
| Letter to S. Smith & Sons Ltd. regarding modifications to a combined instrument patch. | 10th Sep 1934 | Box 62 \ 2 scan0324 | |
| Letter from S. Smith & Sons regarding a drawing for a new light-weight instrument patch and clock winding arrangements. | 11th Sep 1934 | Box 62 \ 2 scan0325 | |
| Proposed change to the figuring on instrument dials. | 19th Sep 1934 | Box 62 \ 2 scan0326 | |
| Faulty A.T. Rev Clock from an E.R. Hall Bentley. | 25th Sep 1934 | Box 62 \ 2 scan0327 | |
| Letter from S. Smith & Sons regarding instrument panel layout and speedometer design. | 4th Oct 1934 | Box 62 \ 2 scan0328 | |
| Proposal for a new instrument patch for the 20/25 HP Chassis, listing required parts for a mockup. | 8th Oct 1934 | Box 62 \ 2 scan0329 | |
| Listing gauges and describing a temporary illumination scheme for the speedometer and clock. | 8th Oct 1934 | Box 62 \ 2 scan0330 | |
| Letter to S. Smith & Sons Ltd. requesting a synchronos electric clock movement for testing on an experimental rig. | 27th Oct 1934 | Box 62 \ 2 scan0331 | |
| Inquiry regarding the introduction of a modified patch for Bentley instruments and its impact on instrument board modifications. | 29th Oct 1934 | Box 62 \ 2 scan0332 | |
| Delay in fitting a new lightened instrument patch for the speedometer and tachometer. | 29th Oct 1934 | Box 62 \ 2 scan0333 | |
| Customer-requested modifications for a chassis allocated by Dex Garages. | 7th Nov 1934 | Box 62 \ 2 scan0334 | |
| With suggestions and feedback for the Spectre instrument board, specifically regarding Scheme 'B'. | 9th Nov 1934 | Box 62 \ 2 scan0335 | |
| Instruction to prepare and fit a Bentley instrument patch to a chassis for testing a petrol gauge reserve warning light. | 21th Sep 1934 | Box 62 \ 2 scan0336 | |
| Return of a damaged Smith Statoscope No.2672 for adjustment by the makers. | 24th Nov 1934 | Box 62 \ 2 scan0337 | |
| Letter from S. Smith & Sons discussing proposed alterations to a cast bracket. | 27th Nov 1934 | Box 62 \ 2 scan0338 | |
| Blueprint for an aluminium bracket. | 3rd Dec 1934 | Box 62 \ 2 scan0339 | |
| Superior dashboard illumination of a Buick car. | 3rd Dec 1934 | Box 62 \ 2 scan0340 | |
| Dashboard illumination, noting the convex dial of a Buick speedometer as the reason for its effectiveness and arranging a trial with a supplier. | 12th Dec 1934 | Box 62 \ 2 scan0341 | |
| Requesting blueprints and listing parts for the 'Spectre' project instrument board. | 22th Dec 1934 | Box 62 \ 2 scan0342 | |
| Requesting the creation of one Mount for Instruments for the 'Spectre' project, referencing drawing D.74797. | 7th Nov 1934 | Box 62 \ 2 scan0343 | |
| Request to modify the glaring headlamp warning light on the instrument board for model 5.B.IV. | 2nd Jan 1935 | Box 62 \ 2 scan0344 | |
| Letter from S. Smith & Sons regarding a delay in the supply of new instruments with concave dials. | 9th Jan 1935 | Box 62 \ 2 scan0345 | |
| Proposal to demonstrate an experimental instrument patch with concave dials to the Sales department. | 22th Feb 1935 | Box 62 \ 2 scan0346 | |
| Failed attempt to mould single pole lamps for the 'SPECTRE' instrument board, proposing an alternative design. | 26th Feb 1935 | Box 62 \ 2 scan0347 | |
| Parts required for fitting new lightweight instruments to a Bentley. | 26th Feb 1935 | Box 62 \ 2 scan0348 | |
| Confirming a verbal arrangement for the supply of three sets of instruments with concave dials for the 'Spectre' project. | 27th Feb 1935 | Box 62 \ 2 scan0349 | |
| Issues with speedometer illumination and proposing improvements to instrument design and grouping. | 28th Feb 1934 | Box 62 \ 2 scan0350 | |
| Instrument dial proposals, including an illuminated model for the Bentley. | 28th Feb 1934 | Box 62 \ 2 scan0351 | |
| Issuing blueprints for new speedometer and rev-counter instruments for a Bentley 5.B.IV. | 1st Mar 1935 | Box 62 \ 2 scan0352 | |
| Letter to S. Smith & Sons regarding the return of concave dial instruments for modification and noting the failure of an oil gauge and speedometer. | 7th Mar 1935 | Box 62 \ 2 scan0353 | |
| Letter suggesting an experiment to improve instrument dial legibility by using concave glass. | 7th Mar 1935 | Box 62 \ 2 scan0354 | |
| Return and required modification of 'Spectre' instruments following test failures. | 7th Mar 1935 | Box 62 \ 2 scan0355 | |
| Letter from S. Smith & Sons regarding clarification on marking a third set of instruments. | 8th Mar 1935 | Box 62 \ 2 scan0356 | |
| Letter from S. Smith & Sons discussing the design of instrument dials and glasses. | 9th Mar 1935 | Box 62 \ 2 scan0357 | |
| Letter to Messrs. S. Smith & Sons, Ltd. specifying the requirement for a third set of instruments to use standard type figures. | 9th Mar 1935 | Box 62 \ 2 scan0358 | |
| Instruction to fit car 21.G.IV with a new instrument board and instruments with concave dials. | 11th Mar 1935 | Box 62 \ 2 scan0359 | |
| Order request for instruments with concave dials for a 20/25HP chassis. | 11th Mar 1935 | Box 62 \ 2 scan0360 | |
| Introduction of new instrument board features and associated parts for various car models. | 11th Mar 1935 | Box 62 \ 2 scan0361 | |
| Summary of a statement from S. Smith & Sons regarding modifications to chassis instruments. | 20th Mar 1935 | Box 62 \ 2 scan0362 | |
| Design and exclusive supply of modified dashboard instruments from Smiths for 40/50 and 20/25 chassis. | 22th Mar 1935 | Box 62 \ 2 scan0363 | |
| Standardisation of an improved catch on the magneto drive to make it easier to operate. | 8th Oct 1925 | Box 62 \ 3 scan0001 | |
| Investigation into a knock on chassis GCK-54 for Mrs. Gloag, identified as a dynamo rattle from the engine gears. | 1st Oct 1928 | Box 62 \ 3 scan0002 | |
| Diagnosing and fixing a galloping knock and gear rattle on chassis GCK-54. | 22th Oct 1928 | Box 62 \ 3 scan0003 | |
| Confirming the dispatch of document LeC.2607 regarding the 20 HP Dynamo Drive. | 3rd Nov 1928 | Box 62 \ 3 scan0004 | |
| Correcting inadequate lubrication on the 'SS' dynamo pinion bearing. | 12th Nov 1928 | Box 62 \ 3 scan0005 | |
| Blueprint showing the oil grooves in a dynamo drive bush for a super sports engine. | 12th Nov 1928 | Box 62 \ 3 scan0006 | |
| Sketch showing the arrangement of an oil scoop for a super-sports engine. | 12th Nov 1928 | Box 62 \ 3 scan0007 | |
| Fit of bolts for the 20HP dynamo drive. | 15th Nov 1928 | Box 62 \ 3 scan0008 | |
| Advantages and disadvantages of two different schemes for a dynamo-battery system's manual charge switch. | 1st Jan 1930 | Box 62 \ 3 scan0009 | |
| Output curves and brush settings for a standard 20 HP dynamo. | 2nd Jan 1930 | Box 62 \ 3 scan0010 | |
| Methods for varying dynamo output, including manual control and bimetal thermostats. | 1st Jan 1930 | Box 62 \ 3 scan0011 | |
| Different types of thermostat units and the advantages of thermostatic output control. | 1st Jan 1930 | Box 62 \ 3 scan0012 | |
| Performance graph of a 20 HP dynamo, showing various output curves against R.P.M. and chassis speed. | 3rd Jan 1930 | Box 62 \ 3 scan0013 | |
| Differences and testing procedures for intermediate output dynamos for 20 HP and 40/50 HP models. | 3rd Jan 1930 | Box 62 \ 3 scan0014 | |
| Experimental production and trial of intermediate output dynamos. | 3rd Jan 1930 | Box 62 \ 3 scan0015 | |
| Work order for two sets of parts for 40/50 & 20-HP Dynamos. | 10th Jan 1930 | Box 62 \ 3 scan0016 | |
| Requesting the modification of an experimental 20 HP Dynamo N. | 3rd Jan 1930 | Box 62 \ 3 scan0017 | |
| The modification of 40/50 HP and 20 HP dynamos with finer field windings. | 3rd Jan 1930 | Box 62 \ 3 scan0018 | |
| Instruction document concerning 48 coil armature dynamos, detailing control brush angles and modifications. | 5th Feb 1930 | Box 62 \ 3 scan0019 | |
| Arrangements for testing experimental machines and proposals for standardisation. | 5th Feb 1930 | Box 62 \ 3 scan0020 | |
| Investigation into various Morganite dynamo brush grades to resolve noise issues on the Phantom and 20 HP models. | 10th Feb 1930 | Box 62 \ 3 scan0021 | |
| Data table comparing properties for different grades of dynamo brushes. | 1st Feb 1930 | Box 62 \ 3 scan0022 | |
| Increasing dynamo output for Phantom and 20 HP models by modifying armature windings and magnetic circuits. | 1st Feb 1930 | Box 62 \ 3 scan0023 | |
| Comparison of 48 and 56 coil armatures, discussing modifications for 'intermediate' output machines. | 1st Feb 1930 | Box 62 \ 3 scan0024 | |
| Testing and provision of higher output dynamos and armature machines for various car models. | 1st Feb 1930 | Box 62 \ 3 scan0025 | |
| Instruction to manufacture 10 Intermediate Output Dynamos for a 20-HP Chassis, listing required parts. | 11th Feb 1930 | Box 62 \ 3 scan0026 | |
| Letter to a supplier discussing alternative brush grades for chassis dynamos on the Phantom II and 20 HP models. | 12th Feb 1930 | Box 62 \ 3 scan0027 | |
| Test on a 20 HP dynamo to determine the magnitude of dissipation of field resistance for reducing output. | 5th Feb 1930 | Box 62 \ 3 scan0028 | |
| Using ballast resistance and a lamp to indicate a reduced charge. | 15th Feb 1930 | Box 62 \ 3 scan0029 | |
| Letter from The Morgan Crucible Company regarding dynamo brushes for the Phantom II and 20 HP chassis. | 18th Feb 1930 | Box 62 \ 3 scan0030 | |
| The necessary modifications for a large output 48 coil, 20 HP dynamo armature. | 26th Feb 1930 | Box 62 \ 3 scan0031 | |
| Dynamo output and battery charging rate for a vehicle running in France. | 27th Feb 1930 | Box 62 \ 3 scan0032 | |
| Graph showing top gear dynamo output in amps versus speed in miles per hour under different lighting loads. | 25th Feb 1930 | Box 62 \ 3 scan0033 | |
| The dynamo output and safe battery charging rates and temperatures. | 28th Feb 1930 | Box 62 \ 3 scan0034 | |
| The 20 HP dynamo output on a 14-GIV model and its effects on the battery. | 28th Feb 1930 | Box 62 \ 3 scan0035 | |
| Notice regarding the receipt of 20 SWG field windings for a 20 HP dynamo from the experimental shop. | 6th Mar 1930 | Box 62 \ 3 scan0036 | |
| Specifications for two high-output 20-HP chassis dynamos with half-charge control. | 8th Mar 1930 | Box 62 \ 3 scan0037 | |
| Order for 20 S.W.G. D.C.C. copper wire for experimental dynamo field windings. | 11th Mar 1930 | Box 62 \ 3 scan0038 | |
| Experimental record sheet for a 48 coil high output dynamo, model IOI.M. | 20th Feb 1930 | Box 62 \ 3 scan0039 | |
| Urging the production of medium output dynamos and requesting advance units for testing purposes. | 17th Mar 1930 | Box 62 \ 3 scan0040 | |
| Request to arrange a half-charge switching scheme for the 20 HP and 20/25 chassis. | 2nd Apr 1930 | Box 62 \ 3 scan0041 | |
| Extract from Mr. Hancock's report on a generator's performance in car 14-GIV after 14,000 miles. | 5th Apr 1930 | Box 62 \ 3 scan0042 | |
| Dispatch of a 48 coil medium output dynamo. | 28th Apr 1930 | Box 62 \ 3 scan0043 | |
| Extract from a report on the performance of a dynamo with bakelaque insulation after 5,000 and 10,000 miles. | 28th Apr 1930 | Box 62 \ 3 scan0044 | |
| The arrangement and accessibility of motor and dynamo terminals on Phantom and 20/25 HP models, with suggestions for improvement. | 14th May 1930 | Box 62 \ 3 scan0045 | |
| Note confirming the dispatch of G.II dynamo No.2.24S.10, the second unit in an order of ten. | 19th May 1930 | Box 62 \ 3 scan0046 | |
| Investigation into interchanging a high output dynamo armature with a standard 20 HP dynamo. | 28th May 1930 | Box 62 \ 3 scan0047 | |
| Improvements to the dynamo wiring protection using flexible brass tubing. | 29th May 1930 | Box 62 \ 3 scan0048 | |
| Electrical experimental record sheet for a 20hp Dynamo, number 1337, tracking its usage and modifications. | 1st Jul 1930 | Box 62 \ 3 scan0049 | |
| Third dynamo of type G.II, a medium output 48 coil machine. | 31th May 1930 | Box 62 \ 3 scan0050 | |
| Intermediate output dynamos. | 12th Jun 1930 | Box 62 \ 3 scan0051 | |
| Receipt of a 20/25 HP dynamo for the 18-GIV car. | 25th Jun 1930 | Box 62 \ 3 scan0052 | |
| Inspection report for a 20/25 Dynamo N from car 14GN after 17,300 miles of use. | 7th Jun 1930 | Box 62 \ 3 scan0053 | |
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