| Description | Date | Identifier | |
| Letter to Joseph Lucas Ltd. arranging for cold room testing of a 20/25 car fitted with Lucas W.T. Horns. | 16th Jul 1935 | Box 59 \ 3 Scan341 | |
| Letter from Clear Hooters Ltd about a pair of wind tone horns sent for testing, detailing their operation and price. | 18th Jul 1935 | Box 59 \ 3 Scan342 | |
| The second page of a letter from Clear Hooters Ltd. seeking approval. | 18th Jul 1935 | Box 59 \ 3 Scan343 | |
| Request to test a pair of Clear-Hooter horns, requiring suitable brackets to be made for mounting on the headlamp pillars of car 18.G.IV. | 31th Aug 1935 | Box 59 \ 3 Scan344 | |
| The unsatisfactory design for fitting wind tone horns on a 20/25 HP car and proposing an alternative. | 6th Sep 1935 | Box 59 \ 3 Scan345 | |
| Criticisms and suggestions for the Spectre horn push mechanism. | 24th Sep 1935 | Box 59 \ 3 Scan346 | |
| Letter from Joseph Lucas Limited regarding the despatch of outline drawings for Wind Tone Horns and an upcoming visit. | 30th Sep 1935 | Box 59 \ 3 Scan347 | |
| Parts and ordering instructions for Wind Tone Horns on the 20/25 HP Chassis. | 1st Oct 1935 | Box 59 \ 3 Scan348 | |
| Installation and wiring of Wind Tone Horns on the 20/25 HP Chassis. | 1st Oct 1935 | Box 59 \ 3 Scan349 | |
| Sending blueprints for Bentley Wind Tone Horns and a list of associated parts. | 1st Oct 1935 | Box 59 \ 3 Scan350 | |
| Letter to Joseph Lucas Ltd. proposing a new relay switching scheme for car horns. | 5th Oct 1935 | Box 59 \ 3 Scan351 | |
| Wiring diagram scheme for Lucas W.T. horns. | 9th Oct 1935 | Box 59 \ 3 Scan352 | |
| Providing the List of Parts for Bentley Wind Tone Horns. | 9th Oct 1935 | Box 59 \ 3 Scan353 | |
| Letter from Joseph Lucas Ltd. discussing a wiring scheme for Wind Tone Horns. | 15th Oct 1935 | Box 59 \ 3 Scan354 | |
| Wiring issue with Lucas Wind Tone Horns and a proposed new scheme to ensure they sound loud in emergencies. | 17th Oct 1935 | Box 59 \ 3 Scan355 | |
| Wiring diagram for the operation of Lucas W.T. horns, ensuring a loud or soft sound based on the button position. | 24th Oct 1935 | Box 59 \ 3 Scan356 | |
| Request for blueprints and an order for a pair of 'Phantom III' Wind Tone Horns for testing. | 24th Oct 1935 | Box 59 \ 3 Scan357 | |
| Internal request to order one pair of Lucas W.T. Horns for testing purposes. | 25th Oct 1935 | Box 59 \ 3 Scan358 | |
| Letter from Joseph Lucas Ltd. to H.E. West of Rolls-Royce arranging a meeting to discuss horns. | 26th Oct 1935 | Box 59 \ 3 Scan359 | |
| Letter to Joseph Lucas, Ltd. arranging a visit to discuss wind tone horns, voltage regulators and lamps. | 29th Oct 1935 | Box 59 \ 3 Scan360 | |
| Confirmation to detail two chromium-plated brackets for horns to be supplied to Messrs. Lucas. | 1st Nov 1935 | Box 59 \ 3 Scan361 | |
| Request for one horn push assembly to be made for horn tests, referencing specific schematics. | 4th Nov 1935 | Box 59 \ 3 Scan362 | |
| Proposed design for the operation of the wind tone horn. | 6th Nov 1935 | Box 59 \ 3 Scan363 | |
| Request to change the horn relay switch on a Phantom III chassis to achieve louder operation. | 6th Nov 1935 | Box 59 \ 3 Scan364 | |
| Confirmation to alter the ventilation of an electric drying oven due to inefficient air circulation for varnish drying tests. | 6th Nov 1935 | Box 59 \ 3 Scan365 | |
| Sending a Lucas horn relay switch to be modified with an extra winding for loud operation. | 9th Nov 1935 | Box 59 \ 3 Scan366 | |
| Request to manufacture and supply steel, chromium-plated parts for the Phantom III Wind Tone Horn Solid Suspension to Messrs. Lucas. | 11th Nov 1935 | Box 59 \ 3 Scan367 | |
| Description of the operation of a two-way 'Soft' and 'Loud' horn control system. | 13th Nov 1935 | Box 59 \ 3 Scan368 | |
| Letter from Joseph Lucas Ltd regarding a faulty horn and a new 3-claw bracket for the 20/25 HP model. | 18th Nov 1935 | Box 59 \ 3 Scan369 | |
| Letter to Joseph Lucas Ltd. regarding unsatisfactory horns on a Phantom III chassis. | 19th Nov 1935 | Box 59 \ 3 Scan370 | |
| Letter from Joseph Lucas Limited regarding unsatisfactory Wind Tone Horns on a 'PHANTOM III' chassis. | 22th Nov 1935 | Box 59 \ 3 Scan371 | |
| Sending two pairs of Lucas W.T. horns for repair and overhaul. | 6th Dec 1935 | Box 59 \ 3 Scan372 | |
| Requesting to fit Lucas wind tone horns with new suspension brackets to a Bentley bump chassis. | 18th Dec 1935 | Box 59 \ 3 Scan373 | |
| Request for Lucas to fit custom-made, chromium-plated brackets to wind tone horns for testing. | 21th Dec 1935 | Box 59 \ 3 Scan374 | |
| Request to replace the 'Clear Hooter' horns with a standard pair on vehicle 18.G.IV. | 6th Jan 1936 | Box 59 \ 3 Scan375 | |
| Standardisation and fitting of wind tone horns on the 25 HP and Bentley models. | 8th Jan 1936 | Box 59 \ 3 Scan376 | |
| Instruction to fit Lucas 'Wind' horns with solid chromium-plated brackets and a modified relay to cars 32-EX and 33-EX. | 8th Jan 1936 | Box 59 \ 3 Scan377 | |
| Failures and proposed modifications for the 20/25 HP chassis wind tone horns. | 9th Jan 1936 | Box 59 \ 3 Scan378 | |
| Parts list for mounting a Horn Relay Switch on a Bentley dash. | 9th Jan 1936 | Box 59 \ 3 Scan379 | |
| Receipt and fitting of strengthened, laminated 3-point springs for a 20/25HP car's wind tone horn. | 13th Jan 1936 | Box 59 \ 3 Scan380 | |
| Objectionable clicking sound from the horn relay switch on the Phantom III chassis, suggesting noise insulation solutions. | 18th Jan 1936 | Box 59 \ 3 Scan381 | |
| Order for a pair of Lucas Wind Tone Horns for a Bentley chassis. | 22th Jan 1936 | Box 59 \ 3 Scan382 | |
| Letter from Joseph Lucas Ltd. regarding a delay in supplying Headlamp two-way Switches. | 25th Jan 1936 | Box 59 \ 3 Scan383 | |
| Request for a pair of 25HP type wind-horn brackets for vibration tests on the 'Bump' test rig. | 28th Jan 1936 | Box 59 \ 3 Scan384 | |
| Requesting the replacement of broken laminated horn springs with a solid type on car 21.G.IV. | 30th Jan 1936 | Box 59 \ 3 Scan385 | |
| The design and production of brackets for Phantom III electric horns. | 10th Feb 1936 | Box 59 \ 3 Scan386 | |
| Request for a report on the experimental mounting of wind horns on a 25-HP chassis. | 11th Feb 1936 | Box 59 \ 3 Scan387 | |
| Confirmation to fit solid type horn brackets on Ph.III production chassis. | 12th Feb 1936 | Box 59 \ 3 Scan388 | |
| Return of unsatisfactory 'Clear Hooter Horns' to the manufacturer after testing. | 13th Feb 1936 | Box 59 \ 3 Scan389 | |
| Testing of solid versus flexible mountings for wind horns on a 25 HP chassis. | 14th Feb 1936 | Box 59 \ 3 Scan390 | |
| Request to manufacture three pairs of Ph.III Wind-Horn Brackets for specific experimental cars. | 14th Feb 1936 | Box 59 \ 3 Scan391 | |
| Request to fit a pair of wind horns to a Bentley Car, chassis B-56-BN, with a corresponding parts list. | 26th Feb 1936 | Box 59 \ 3 Scan392 | |
| The standardisation and testing of Wind Tone Horns for Bentley chassis. | 26th Feb 1936 | Box 59 \ 3 Scan393 | |
| Requesting the fitting of wind horns to a Bentley Car B-56-BN, including a list of required parts. | 18th Sep 1936 | Box 59 \ 3 Scan394 | |
| Scheme for fitting Lucas wind tone horns to the 25 HP model and issues with coachbuilders. | 26th Feb 1936 | Box 59 \ 3 Scan395 | |
| Requesting the return of damaged wind-horn covers to the makers for repair. | 2nd Mar 1936 | Box 59 \ 3 Scan396 | |
| Despatch note for a pair of Wind Tone Horns sent to Messrs. J. Lucas Limited for repairs. | 5th Mar 1936 | Box 59 \ 3 Scan397 | |
| Request for a model bracket for wind horns on the 25/30 HP chassis in order to create a standardized detail drawing. | 6th Mar 1936 | Box 59 \ 3 Scan398 | |
| Replying to a query about the availability of a bracket, expecting a sample from Lucas's. | 7th Mar 1936 | Box 59 \ 3 Scan399 | |
| Letter to Joseph Lucas Ltd. requesting to expedite the delivery of horn brackets. | 7th Mar 1936 | Box 59 \ 3 Scan400 | |
| Consulting coachbuilders on the suitability of front wing valances for mounting wind tone horns on the 20/25 HP model. | 10th Mar 1936 | Box 59 \ 3 Scan401 | |
| Consultation with coachbuilders regarding the suitability of front wing valances for mounting wind tone horns. | 10th Mar 1936 | Box 59 \ 3 Scan402 | |
| Letter from Joseph Lucas Limited regarding the re-making and delivery of sample Wind Tone Horn brackets. | 11th Mar 1936 | Box 59 \ 3 Scan403 | |
| Confirming the go-ahead for standardising the mounting of wind tone horns on the 25 HP model. | 12th Mar 1936 | Box 59 \ 3 Scan404 | |
| The standardisation of mounting wind tone horns on the 25 HP model. | 12th Mar 1936 | Box 59 \ 3 Scan405 | |
| Letter from Joseph Lucas Ltd regarding the dispatch of strengthened Horn Brackets for testing. | 17th Mar 1936 | Box 59 \ 3 Scan406 | |
| Troubles and the standardization of Wind Tone Horns on various chassis models. | 18th Mar 1936 | Box 59 \ 3 Scan407 | |
| Repeated failure of wind tone horns, suggesting the cause is rigid mounting and proposing a modified set of parts for testing. | 23th Mar 1936 | Box 59 \ 3 Scan408 | |
| Failed wind horns on car 22-G-IV and a request for their replacement. | 23th Mar 1936 | Box 59 \ 3 Scan409 | |
| Letter from Joseph Lucas Limited regarding the supply of rubber bushes for Wind Tone Horns. | 25th Mar 1936 | Box 59 \ 3 Scan410 | |
| Standardising the Lucas horns for 20/25-HP, Bentley and Phantom III chassis. | 6th Apr 1936 | Box 59 \ 3 Scan411 | |
| Letter to Messrs. J. Lucas Ltd. regarding continual trouble with failing wind tone electrical horns on 20/25 HP chassis. | 7th Apr 1936 | Box 59 \ 3 Scan412 | |
| Instructions for fitting new wind horns and mountings to car 22-G-V. | 17th Apr 1936 | Box 59 \ 3 Scan413 | |
| Return of magnetos for repair and modification from Kestrel and Merlin engines. | 7th May 1936 | Box 59 \ 3 Scan414 | |
| Material change for Phantom III Wind Tone Horn Brackets to reduce cost. | 11th May 1936 | Box 59 \ 3 Scan415 | |
| Cross-reference note for previous correspondence regarding a 40/50 N.B. dynamo. | 14th Aug 1925 | Box 60 \ 1 Scan001 | |
| Order request for 6 sets of Dynamo Brushes for an E.A.C. Dynamo, along with blueprints. | 14th Aug 1925 | Box 60 \ 1 Scan002 | |
| Stock levels and distribution of narrow type brushes. | 13th Apr 1926 | Box 60 \ 1 Scan003 | |
| Internal request to order six further sets of experimental dynamo brushes for use with special brush holders. | 15th Apr 1926 | Box 60 \ 1 Scan004 | |
| Table of dimensions for dynamo brushes for Goshawk and E.A.C. models. | 11th May 1926 | Box 60 \ 1 Scan005 | |
| Instruction sheet detailing the components of a narrow type brush set for an EAC Dynamo and noting an order discrepancy. | 21th May 1926 | Box 60 \ 1 Scan006 | |
| Adapting standard experimental brushes for testing on an N.B. type machine. | 4th Sep 1926 | Box 60 \ 1 Scan007 | |
| The differences between three groups of brushes for Standard EAC and N.B. dynamos. | 10th Sep 1926 | Box 60 \ 1 Scan008 | |
| Test results for narrow brushes on a K machine, comparing wear against standard brushes. | 13th Oct 1926 | Box 60 \ 1 Scan009 | |
| Report comparing the wear and noise of control brushes against standard brushes, attributing lower wear to cooler running conditions. | 29th Jun 1920 | Box 60 \ 1 Scan010 | |
| List of finally fixed quantities and specifications for a new experimental standard EAC Dynamo. | 7th Dec 1926 | Box 60 \ 1 Scan011 | |
| Letter from Le Carbone regarding a trial of new dynamo brushes to reduce noise. | 27th Jan 1927 | Box 60 \ 1 Scan012 | |
| Revised and corrected page from a letter detailing sample dynamo brushes for 20 HP and 40/50 HP lighting sets. | 28th Jan 1927 | Box 60 \ 1 Scan013 | |
| Letter to Messrs. Le Carbone about an error in a dynamo brush shipment and clarifying the correct requirements. | 28th Jan 1927 | Box 60 \ 1 Scan014 | |
| Letter from supplier Le Carbone regarding a shortage of two dynamo brushes in a sample delivery for testing. | 29th Jan 1927 | Box 60 \ 1 Scan015 | |
| Letter to The Morgan Crucible Co. Ltd. concerning the supply of pigtail end terminals for experimental dynamo brushes. | 4th Feb 1927 | Box 60 \ 1 Scan016 | |
| Letter from The Morgan Crucible Company regarding the trial production of experimental dynamo brushes. | 5th Feb 1927 | Box 60 \ 1 Scan017 | |
| Letter from Le Carbone regarding the dispatch of two missing brushes from an original consignment. | 22th Feb 1927 | Box 60 \ 1 Scan018 | |
| Letter to Messrs. Le Carbone confirming receipt of satisfactory brushes. | 23th Feb 1927 | Box 60 \ 1 Scan019 | |
| Advice note from The Morgan Crucible Company Limited listing various types of electrographitic brushes. | 7th Mar 1927 | Box 60 \ 1 Scan020 | |
| Advice note from The Morgan Crucible Company for electrographitic brushes for trial on generators. | 7th Mar 1927 | Box 60 \ 1 Scan021 | |
| Instruction sheet detailing the receipt of experimental Morgan brushes for NB type dynamos. | 11th Mar 1927 | Box 60 \ 1 Scan022 | |
| Letter to The Morgan Crucible Co. Ltd. acknowledging receipt of brushes for testing. | 14th Mar 1927 | Box 60 \ 1 Scan023 | |
| Test report on Morganite EG2 narrow brushes for the M Machine. | 12th Jul 1927 | Box 60 \ 1 Scan024 | |
| Instruction sheet detailing the wear and condition of positive, negative, and control brushes. | 29th Jun 1920 | Box 60 \ 1 Scan025 | |
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