| Description | Date | Identifier | |
| Letter from Dunlop Rubber Co. Ltd. regarding the supply schedule for modified Silent Tread Tyres. | 18th Nov 1930 | Box 45 \ 2 Scan322 | |
| Balancing issues with Special Dunlop Modified Silent Type tyre covers fitted to a Weymann 25 HP car. | 21th Nov 1930 | Box 45 \ 2 Scan323 | |
| Letter to Dunlop Rubber Co. concerning unbalanced experimental 'Silent Tread Tyres' for the 20/25 car. | 24th Nov 1930 | Box 45 \ 2 Scan324 | |
| Note about out-of-balance tyres for Modified Silent Type Covers, a matter which has been taken up with Dunlop. | 24th Nov 1930 | Box 45 \ 2 Scan325 | |
| Fitting of non-standard tyres to the Phantom II, noting issues with poor steering. | 24th Nov 1930 | Box 45 \ 2 Scan326 | |
| Standardization of Dunlop 'Fort' Tyres for 20 HP and 40/50 HP models. | 25th Nov 1930 | Box 45 \ 2 Scan327 | |
| Letter from Dunlop Rubber Co. Ltd. apologising for sending 5 unbalanced modified silent tread pattern covers. | 2nd Dec 1930 | Box 45 \ 2 Scan328 | |
| Explanation from Messrs. Dunlop regarding unbalanced modified silent tread tyres. | 1st Dec 1930 | Box 45 \ 2 Scan329 | |
| Letter from Dunlop regarding the development and supply of 'Silent Tyres'. | 13th Jan 1931 | Box 45 \ 2 Scan330 | |
| Use of Dunlop and 'India' brand tyres for 40/50 HP and 20 HP cars. | 10th Feb 1931 | Box 45 \ 2 Scan331 | |
| Follow-up letter regarding a Dunlop tyre sent for examination that has not yet arrived. | 14th Feb 1931 | Box 45 \ 2 Scan332 | |
| Letter to Dunlop Rubber Co. Ltd. regarding the testing of Canadian Dunlop Tyres. | 16th Feb 1931 | Box 45 \ 2 Scan333 | |
| Fitting of Canadian Pattern Dunlop Tyres to car 58-GN. | 13th Feb 1931 | Box 45 \ 2 Scan334 | |
| Suitability of Dunlop's modified silent tread tyres as a standard fitment. | 26th Feb 1931 | Box 45 \ 2 Scan335 | |
| Performance and suitability of Dunlop modified silent tread tyres for different road conditions. | 4th Mar 1931 | Box 45 \ 2 Scan336 | |
| Requesting an urgent order of one dozen special Dunlop tyres for a 40/50 HP car for use at Brooklands Track. | 13th Apr 1931 | Box 45 \ 2 Scan337 | |
| Letter from Dunlop Rubber Co. regarding altered non-skid tyre samples sent for approval. | 15th Apr 1931 | Box 45 \ 2 Scan338 | |
| Letter from Dunlop Rubber Co. Ltd. to W.A. Robotham regarding a meeting to discuss the exploitation of a rubber suspension device. | 20th Apr 1931 | Box 45 \ 2 Scan339 | |
| Letter to A. Healey of Dunlop Rubber Co. Ltd. confirming a meeting time. | 21th Apr 1931 | Box 45 \ 2 Scan340 | |
| Initial test results for a new type of Dunlop silent tread tyre. | 22th Apr 1931 | Box 45 \ 2 Scan341 | |
| Testing procedure for a new pair of silent Dunlop tyres with modified tread patterns. | 23th Apr 1931 | Box 45 \ 2 Scan342 | |
| Standardization and performance of silent tread tyres. | 30th Apr 1931 | Box 45 \ 2 Scan343 | |
| Questioning the benefits of modified silent tread tyres and their proposed adoption. | 29th Apr 1931 | Box 45 \ 2 Scan344 | |
| Letter from Dunlop Rubber Co. Ltd. requesting data on the efficiency of tyres as power transmitters. | 2nd May 1931 | Box 45 \ 2 Scan345 | |
| Correspondence concerning the return and testing of tyre covers from Dunlop. | 12th May 1931 | Box 45 \ 2 Scan346 | |
| Requesting the return of an American Heavy Duty Cover to The Dunlop Rubber Co. Ltd. | 13th May 1931 | Box 45 \ 2 Scan347 | |
| Letter to The Dunlop Rubber Co. Ltd. explaining the inability to provide accurate figures for power loss in tyres and transmission. | 20th May 1931 | Box 45 \ 2 Scan348 | |
| Non-skidding properties and testing of new silent tread tyres against existing standards. | 21th May 1931 | Box 45 \ 2 Scan349 | |
| Comparison photograph of a standard silent tread and a new type silent tread Dunlop tyre. | 21th Aug 1931 | Box 45 \ 2 Scan350 | |
| Blueprint detailing the dimensions and design of a 7' x 20' Dunlop modified silent tread, fort reinforced tyre. | 18th May 1931 | Box 45 \ 2 Scan351 | |
| Stamped document from the Print Room in Derby. | 21th May 1931 | Box 45 \ 2 Scan352 | |
| Blueprint showing the dimensions and pattern of a 7.00' x 20' Dunlop Silent Tread Tyre. | 21th May 1931 | Box 45 \ 2 Scan353 | |
| Extremely faded document with only a purple date stamp being clearly legible. | 21th May 1931 | Box 45 \ 2 Scan354 | |
| New Dunlop tyre tread design and its comparison to existing silent and triple stud tyres. | 6th Jun 1931 | Box 45 \ 2 Scan355 | |
| Proposal from the Dunlop Company to stop producing 'Silent Tread Covers' and only supply 'Fort' Tyres. | 12th Jun 1931 | Box 45 \ 2 Scan356 | |
| Letter from Dunlop Rubber Co. Ltd. concerning the provision of tyre dimension details. | 2nd Oct 1931 | Box 45 \ 2 Scan357 | |
| Table of tyre specifications listing size, type, inflated diameter, inflated width, and effective radius. | 2nd Oct 1931 | Box 45 \ 2 Scan358 | |
| Letter from Dunlop Rubber Co. Ltd. enclosing an updated data sheet on tyre dimensions for new standard rims. | 9th Oct 1931 | Box 45 \ 2 Scan359 | |
| Table of tyre and rim specifications with corresponding inflation diameter, inflation width, and effective radius dimensions. | 8th Oct 1931 | Box 45 \ 2 Scan360 | |
| Letter to Dunlop Rubber Co. Ltd. requesting a set of 6 tyres with the Canadian Dunlop pattern for testing. | 23th Oct 1931 | Box 45 \ 2 Scan361 | |
| Request to the Dunlop Rubber Co. for a set of tyres, with an inquiry about available tread patterns. | 23th Oct 1931 | Box 45 \ 2 Scan362 | |
| Letter from Dunlop Rubber Co. Ltd. regarding the availability of moulds for experimental tyres. | 26th Oct 1931 | Box 45 \ 2 Scan363 | |
| Letter to Dunlop Rubber Co. Ltd. regarding the supply of two specific sizes of Fort tyres for road testing. | 29th Oct 1931 | Box 45 \ 2 Scan364 | |
| Letter from Dunlop regarding experimental tyres with a new tread pattern. | 30th Oct 1931 | Box 45 \ 2 Scan365 | |
| Letter from Dunlop Rubber Co. questioning a claim about tyre noise reduction from high domed wings. | 6th Nov 1931 | Box 45 \ 2 Scan366 | |
| Letter to Dunlop Rubber Co. Ltd. regarding the unproven effect of wing shape on tyre noise. | 10th Nov 1931 | Box 45 \ 2 Scan367 | |
| Letter from Dunlop Rubber Co. discussing issues with a modified Silent tyre and the ordering of new moulds. | 11th Nov 1931 | Box 45 \ 2 Scan368 | |
| Letter to Dunlop Rubber Co. Ltd. clarifying a mistake in quoted tyre mold sizes. | 13th Nov 1931 | Box 45 \ 2 Scan369 | |
| Typed letter discussing noise issues with Silent Dunlop tyres due to 'toeing and heeling' and a new Canadian tread design. | 21th Nov 1931 | Box 45 \ 2 Scan370 | |
| Experiments with a new silent tyre tread to address issues with groans. | 27th Nov 1931 | Box 45 \ 2 Scan371 | |
| Letter to Dunlop Rubber Co. Ltd. requesting urgent delivery of special tyres for an endurance test on the Continent. | 21th Dec 1931 | Box 45 \ 2 Scan372 | |
| Faulty running due to chassis battery ignition issues and the principles of the induction coil. | 16th Apr 1920 | Box 45 \ 3 Scan001 | |
| Analysis of oscillation frequency, voltage, and current in a circuit with primary and secondary windings. | 16th Apr 1920 | Box 45 \ 3 Scan002 | |
| Technical memorandum discussing current oscillation and the importance of perfect metallic contact in ignition circuits. | 16th Apr 1920 | Box 45 \ 3 Scan003 | |
| Ignition reliability issues due to poor condenser earthing and proposing a solution involving a flexible metallic connection. | 16th Apr 1920 | Box 45 \ 3 Scan004 | |
| Hand-drawn wiring diagram for low tension ignition connections. | 4th Apr 1920 | Box 45 \ 3 Scan005 | |
| The performance of electrical parts after a 10,000-mile test on a 2.KX car. | 20th Apr 1920 | Box 45 \ 3 Scan006 | |
| Report discussing issues and recommendations regarding coils, a dynamo, and wiring for an experimental car. | 20th Apr 1920 | Box 45 \ 3 Scan007 | |
| Extract detailing a battery ignition failure due to a poor condenser connection during a 10,000-mile test. | 21th Apr 1920 | Box 45 \ 3 Scan008 | |
| Potential solutions for a faulty battery ignition system. | 7th May 1920 | Box 45 \ 3 Scan009 | |
| Earthing of a condenser housing for the battery ignition system. | 7th May 1920 | Box 45 \ 3 Scan010 | |
| Requesting instructions to implement a flexible earthed connection to the condenser housing on experimental cars for standardisation. | 20th May 1920 | Box 45 \ 3 Scan011 | |
| Requesting the design and trial of a flexible metallic earth connection for the chassis battery ignition. | 21th May 1920 | Box 45 \ 3 Scan012 | |
| Ongoing troubles with faulty battery ignition and condenser construction. | 22th Jun 1920 | Box 45 \ 3 Scan013 | |
| Need for retrospective modifications to an unreliable battery ignition system. | 22th Jun 1920 | Box 45 \ 3 Scan014 | |
| Whether a faulty battery ignition requires a production improvement or a design modification for the condenser connection. | 23th Jun 1920 | Box 45 \ 3 Scan015 | |
| Query about the implementation status for the flexible metallic connection between the condenser housing and chassis frame. | 12th Aug 1920 | Box 45 \ 3 Scan016 | |
| Design of a flexible connection from the condenser housing to the frame. | 9th Sep 1920 | Box 45 \ 3 Scan017 | |
| With a sketch discussing a flexible connection from a condenser housing to a frame for N. Scheme 555. | 4th Sep 1920 | Box 45 \ 3 Scan018 | |
| Distributing blueprints for a new direct connection on the 40/50 Chassis battery ignition system. | 10th Sep 1920 | Box 45 \ 3 Scan019 | |
| Experimental testing of a condenser earth connection for a 40/50HP chassis. | 27th Sep 1920 | Box 45 \ 3 Scan020 | |
| Experimental memo detailing the parts required for an additional earth connection between the condenser casing and chassis. | 29th Oct 1920 | Box 45 \ 3 Scan021 | |
| Improvements to ignition plugs and condensers, referencing tests on Bosch plugs. | 12th Nov 1920 | Box 45 \ 3 Scan022 | |
| Experiment on a flexible connection between the condenser housing and the frame. | 1st Jan 1921 | Box 45 \ 3 Scan023 | |
| Confirming the handover of a condenser and case for an experiment and requesting instructions for a modification. | 21th Jan 1921 | Box 45 \ 3 Scan024 | |
| Requesting instructions for modifications to the Condenser to suit the earth connection. | 26th Jan 1921 | Box 45 \ 3 Scan025 | |
| Proposal for modifications to the condenser on the 40/50 chassis to ease assembly and improve the earth connection. | 4th Feb 1921 | Box 45 \ 3 Scan026 | |
| Instruction sheet detailing the parts required to produce a modified experimental Condenser for the 40/50 Chassis. | 2nd Feb 1921 | Box 45 \ 3 Scan027 | |
| Modified Condenser, providing blueprints for 'Scheme 746' and advising of forthcoming details for a modified Casing. | 2nd Feb 1921 | Box 45 \ 3 Scan028 | |
| Requesting the production of three experimental sets for a condenser distributor on a 40/50 chassis, detailing the required blueprints. | 26th Feb 1921 | Box 45 \ 3 Scan029 | |
| Production of experimental condensers for the 40/50 chassis, referencing associated blueprints. | 4th Apr 1921 | Box 45 \ 3 Scan030 | |
| On the development of a flexible connection from the condenser to the crank-chamber, addressing issues of pitted points and poor earthing. | 27th May 1921 | Box 45 \ 3 Scan031 | |
| Confirmation of a telegram from Royce to Hives about a delay in standardising a flexible part. | 25th May 1921 | Box 45 \ 3 Scan032 | |
| Telegram from Elliott in Chichester requesting a design or model for a new condenser connection from Hives in Derby. | 1st Aug 1921 | Box 45 \ 3 Scan033 | |
| Dispatch of condenser drawing D.1682 and a model condenser. | 1st Jun 1921 | Box 45 \ 3 Scan034 | |
| Mr. Royce's requested alterations to the 40/50 HP battery ignition condenser blueprint D.1682. | 4th Jun 1921 | Box 45 \ 3 Scan035 | |
| Alterations to a condenser, highlighting potential distortion and cracking issues with mica plates due to insulation changes. | 6th Jun 1921 | Box 45 \ 3 Scan036 | |
| Confirmation of a telegram telephoned to Chichester regarding an ignition problem. | 9th Jun 1921 | Box 45 \ 3 Scan037 | |
| Sending a sample of a modified condenser housing for inspection by Mr. Royce. | 11th Jun 1921 | Box 45 \ 3 Scan038 | |
| Battery ignition trouble, specifically related to faulty earthing of the condenser. | 7th Jun 1921 | Box 45 \ 3 Scan039 | |
| Improvements and testing on a new condenser model to address mica tearing and contact point sparking. | 11th Jun 1921 | Box 45 \ 3 Scan040 | |
| Progress report detailing the development and issues related to a flexible condenser earthing connection. | 11th Jun 1921 | Box 45 \ 3 Scan041 | |
| The timeline and causes of delays for an experimental job, including a conversation with Mr. Royce regarding departmental focus. | 11th Jun 1921 | Box 45 \ 3 Scan042 | |
| Relaying Mr. Royce's preference for using press-pan insulation on the 40/50 HP chassis condenser. | 23th Jun 1921 | Box 45 \ 3 Scan043 | |
| Standardisation of the 40/50 HP condenser, detailing a new earthing connection and an altered stud fixing design. | 25th Jun 1921 | Box 45 \ 3 Scan044 | |
| Mr. Royce's preference for press-pan over micanite as insulation material for the condenser on a 40/50 HP chassis. | 1st Jun 1921 | Box 45 \ 3 Scan045 | |
| Modifications to a flexible condenser earthing connection. | 1st Jul 1921 | Box 45 \ 3 Scan046 | |
| Proposal to earth the Condenser Casing E.18210, noting the existing stock levels. | 5th Jul 1921 | Box 45 \ 3 Scan047 | |
| Notification of revised blueprint dimensions for a Terminal Stud on a Condenser for a 40/50 chassis. | 1st Jul 1921 | Box 45 \ 3 Scan048 | |
| Parts required for an improved earth terminal on the condenser for the 40/50 chassis. | 1st Jul 1921 | Box 45 \ 3 Scan049 | |
| | | | |
