| Description | Date | Identifier | |
| Request to the Cost Department for the cost of standardising dual high-frequency electric horns on the 20/25 HP chassis. | 7th Mar 1933 | Box 59 \ 3 Scan241 | |
| Letter to Joseph Lucas & Co. Ltd. regarding a faulty C.A.V. bosch regulator unit being returned for testing and replacement. | 10th Mar 1933 | Box 59 \ 3 Scan242 | |
| Decision not to standardise the Dual High Frequency Electric Horn on the 20/25 HP chassis due to extra cost. | 14th Mar 1933 | Box 59 \ 3 Scan243 | |
| Letter to Joseph Lucas Ltd. regarding the return and testing of a windscreen wiper. | 14th Mar 1933 | Box 59 \ 3 Scan244 | |
| Letter to Joseph Lucas Ltd requesting special or detuned horns for testing on a Continental Sports Phantom chassis. | 14th Mar 1933 | Box 59 \ 3 Scan245 | |
| Letter from Joseph Lucas Limited regarding an enquiry about Vibrator Control for Dynamos. | 14th Mar 1933 | Box 59 \ 3 Scan246 | |
| Letter from Joseph Lucas Limited concerning a meeting and follow-up actions regarding windscreen wipers. | 17th Mar 1933 | Box 59 \ 3 Scan247 | |
| Letter from Joseph Lucas Ltd. acknowledging an order for C.A.V.-Bosch voltage regulators. | 17th Mar 1933 | Box 59 \ 3 Scan248 | |
| Letter to Klaxon Ltd. regarding feedback on their windscreen wipers and a request for new samples of electric horns for testing. | 18th Mar 1933 | Box 59 \ 3 Scan249 | |
| Complaint letter to Joseph Lucas Ltd. regarding failures of their 'Alto' electric horns. | 18th Mar 1933 | Box 59 \ 3 Scan250 | |
| Letter discussing a high frequency horn and a meeting with Mr. Thacker about it and C.A.V. regulators. | 20th Mar 1933 | Box 59 \ 3 Scan251 | |
| Letter from Klaxon Ltd. regarding a delay in supplying sample horns for testing due to a parts shortage for a new model. | 20th Mar 1933 | Box 59 \ 3 Scan252 | |
| Standardisation of two Lucas H.F.722 electric horns secured to headlamp pillars. | 15th Sep 1932 | Box 59 \ 3 Scan253 | |
| Proposal for the standardisation of chassis parts by introducing Oilite bushes. | 23th Sep 1932 | Box 59 \ 3 Scan254 | |
| Confirming a telephone message about a visit from Mr Thacker of Messrs. Lucas. | 20th Mar 1933 | Box 59 \ 3 Scan255 | |
| Letter from supplier Klaxon Ltd concerning the dispatch of new motor types for testing. | 22th Mar 1933 | Box 59 \ 3 Scan256 | |
| Letter to Messrs Klaxon Ltd regarding bench test results for two windscreen wipers, models EW.378 and EW.377. | 28th Mar 1933 | Box 59 \ 3 Scan257 | |
| Letter from Joseph Lucas Limited confirming no defect in a voltage regulator. | 28th Mar 1933 | Box 59 \ 3 Scan258 | |
| Letter to Joseph Lucas Ltd. regarding loose chromium plated nuts on the front of the horn and ordering replacements. | 7th Jun 1933 | Box 59 \ 3 Scan259 | |
| Letter from Joseph Lucas Limited regarding the despatch and testing of new Alto horns. | 7th Jun 1933 | Box 59 \ 3 Scan260 | |
| Letter from Joseph Lucas Ltd. regarding an issue with loose chromium-plated groove nuts on high-frequency horns. | 9th Jun 1933 | Box 59 \ 3 Scan261 | |
| Testing of new Lucas Alto Horns with modified diaphragm springing on chassis I.B.IV. | 9th Jun 1933 | Box 59 \ 3 Scan262 | |
| Letter to supplier Joseph Lucas & Sons Ltd. regarding modifications and loose nuts on Lucas H.F. Horns. | 12th Jun 1933 | Box 59 \ 3 Scan263 | |
| Requesting the despatch of special experimental Lucas H.F. horns for modification. | 12th Jun 1933 | Box 59 \ 3 Scan264 | |
| Letter to Joseph Lucas Ltd. chasing the return of modified HF722 Alto Horns for testing on a Bentley chassis. | 28th Jun 1933 | Box 59 \ 3 Scan265 | |
| Report about receiving electric shocks from the push button switch for the dual horns on a Blue Bentley. | 6th Jul 1933 | Box 59 \ 3 Scan266 | |
| Fitting of Lucas Dual High Frequency Horns on 3½ litre Bentley cars. | 19th Jul 1938 | Box 59 \ 3 Scan267 | |
| Return of Lucas HF.722 horns to be converted to the HF728 pattern. | 21th Sep 1933 | Box 59 \ 3 Scan268 | |
| Letter to Joseph Lucas Ltd. regarding the return and selection of sample headlamps and horns. | 22th Sep 1933 | Box 59 \ 3 Scan269 | |
| Returning a sample pair of Lucas High Frequency Horns with chromium plated stone guards. | 22th Sep 1933 | Box 59 \ 3 Scan270 | |
| Fitting Lucas HF 728 horns and a proposal to standardize the bracket for Bentley and 40/50 chassis. | 17th Oct 1933 | Box 59 \ 3 Scan271 | |
| Letter to Joseph Lucas Ltd. detailing faults with horns and headlamps found during testing of a new Bentley 3½ litre chassis. | 23th Oct 1933 | Box 59 \ 3 Scan272 | |
| Letter discussing potential modifications to the headlamp wire fixing on a high-speed car. | 23th Oct 1933 | Box 59 \ 3 Scan273 | |
| The despatch of a pair of Lucas Type HF.728 horns to Joseph Lucas Ltd. | 23th Oct 1933 | Box 59 \ 3 Scan274 | |
| Letter from Joseph Lucas Limited regarding issues with horn and headlamp components on a 3 1/2 Litre Bentley. | 24th Oct 1933 | Box 59 \ 3 Scan275 | |
| Letter from Joseph Lucas Limited concerning the testing of horns and the wiring of a headlamp for a Bentley 3 1/2 Litre. | 30th Oct 1933 | Box 59 \ 3 Scan276 | |
| Letter from Joseph Lucas Limited regarding the dispatch of readjusted H.F.728 horns. | 30th Oct 1933 | Box 59 \ 3 Scan277 | |
| Letter from Joseph Lucas Limited concerning a laboratory report on a faulty Alto De Luxe Horn. | 31th Oct 1933 | Box 59 \ 3 Scan278 | |
| The sale of a second-hand Lucas HF.722 electric horn. | 3rd Nov 1933 | Box 59 \ 3 Scan279 | |
| The fitting of a protective ferrule for horn wiring on Bentley chassis to prevent chafing. | 24th Nov 1933 | Box 59 \ 3 Scan280 | |
| Recommending the sale of a second-hand Bosch Horn to an employee for a nominal price. | 24th Apr 1934 | Box 59 \ 3 Scan281 | |
| Request to include a new Bentley horn button on a vehicle for 10,000 miles trials. | 3rd May 1934 | Box 59 \ 3 Scan282 | |
| Complaints of electric shocks from Bentley horn buttons, attributing the issue to poor earthing and proposing solutions. | 10th Jul 1934 | Box 59 \ 3 Scan283 | |
| Instructions to cover modified extra large Bentley horn buttons with moulded insulation to prevent electric shocks. | 19th Jul 1934 | Box 59 \ 3 Scan284 | |
| Redesigned Bentley horn button to prevent electric shocks and improve usability. | 20th Jul 1934 | Box 59 \ 3 Scan285 | |
| Electric shocks from the horn button, requesting a modification to two vehicles. | 31th Jul 1934 | Box 59 \ 3 Scan286 | |
| New Ministry of Transport scheme prohibiting electric horn operation after 11.30 pm. | 27th Aug 1934 | Box 59 \ 3 Scan287 | |
| Suggestion to make the electric horns' front grille more distinctive, possibly with an R.R. monogram. | 30th Aug 1934 | Box 59 \ 3 Scan288 | |
| Letter to Joseph Lucas Ltd. confirming the supply of standard Bentley horns with drain holes and new bugle horns for testing. | 30th Aug 1934 | Box 59 \ 3 Scan289 | |
| Inquiring about a switch to disable car horns during safety zone periods at night. | 4th Sep 1934 | Box 59 \ 3 Scan290 | |
| Letter from Joseph Lucas Ltd regarding the supply of HF.728 New Alto Horns and a Micrometer Adjustment Unit. | 4th Sep 1934 | Box 59 \ 3 Scan291 | |
| Decision to not introduce the R-R monogram on electric horns, leaving grille design to Lucas. | 5th Sep 1934 | Box 59 \ 3 Scan292 | |
| French regulations regarding the operation of car horns at night time. | 7th Sep 1934 | Box 59 \ 3 Scan293 | |
| Fitting of special experimental Lucas horns with drain holes to car 27-EX for testing. | 7th Sep 1934 | Box 59 \ 3 Scan294 | |
| Invoice from Joseph Lucas Ltd. for a pair of horns supplied for a Bentley Test Car. | 17th Sep 1934 | Box 59 \ 3 Scan295 | |
| Request to issue a covering order for experimental horns fitted with water drain holes for Bentley cars. | 18th Sep 1934 | Box 59 \ 3 Scan296 | |
| Suggestion for a master switch to alternate the steering wheel button's function between the horn and flashing headlights. | 21th Sep 1934 | Box 59 \ 3 Scan297 | |
| Safety concerns of a dual-use horn button for night time operation. | 24th Sep 1934 | Box 59 \ 3 Scan298 | |
| The operation of car horns at night. | 26th Sep 1934 | Box 59 \ 3 Scan299 | |
| Standardisation of parts document for a large type horn button. | 8th Oct 1934 | Box 59 \ 3 Scan300 | |
| Cost estimate and implementation plan for the standardisation of parts. | 28th Sep 1934 | Box 59 \ 3 Scan301 | |
| Recommendation to sell an obsolete pattern Lucas horn to an employee for a nominal charge. | 17th Nov 1934 | Box 59 \ 3 Scan302 | |
| Request to fit Lucas Horns from the Spectre to chassis 28-EX due to issues with the existing ones. | 21th Jan 1935 | Box 59 \ 3 Scan303 | |
| Letter regarding the trial of new electrically operated dual-tone horns from Messrs Lucas for potential standardisation on R-R and Bentley chassis. | 22th Jan 1935 | Box 59 \ 3 Scan304 | |
| Order for Lucas electric horns for a trial fitting. | 24th Jan 1935 | Box 59 \ 3 Scan305 | |
| Trial of new electric horns with a more pleasant tone. | 24th Jan 1935 | Box 59 \ 3 Scan306 | |
| Letter from Joseph Lucas Limited regarding the despatch of a pair of Model WT.11 Wind-Tone Horns. | 24th Jan 1935 | Box 59 \ 3 Scan307 | |
| Instructions and parts list for mounting a new type Lucas Horn on the headlamp tube of the Spectre Chassis. | 28th Jan 1935 | Box 59 \ 3 Scan308 | |
| Request for recommendations on wiring a 6 volt Cicca Horn to a 12 volt lighting set. | 30th Jan 1935 | Box 59 \ 3 Scan309 | |
| Requesting the fitting of new Lucas type WT horns to a Spectre I vehicle. | 29th Jan 1935 | Box 59 \ 3 Scan310 | |
| Use of a resistor to adapt a 6-volt horn for a 12-volt system for a Mr. Bloom. | 31th Jan 1935 | Box 59 \ 3 Scan311 | |
| Letter from Joseph Lucas Limited enclosing wiring diagrams for WT.11 Wind Tone Horns. | 7th Feb 1935 | Box 59 \ 3 Scan312 | |
| Request to Joseph Lucas Ltd. for an internal wiring diagram for the relay unit of Lucas type WT horns. | 8th Feb 1935 | Box 59 \ 3 Scan313 | |
| Letter from Joseph Lucas Limited enclosing wiring diagram R.3763 for WT Horns. | 11th Feb 1935 | Box 59 \ 3 Scan314 | |
| Requesting written confirmation of a verbal opinion on Lucas electrically operated wind horns. | 19th Feb 1935 | Box 59 \ 3 Scan315 | |
| The fitting of special Lucas horns to a chassis at Thrupp & Maberly's Works. | 20th Feb 1935 | Box 59 \ 3 Scan316 | |
| Letter to Joseph Lucas Ltd. regarding the incorporation of WT horns and relay switches on a chassis. | 22th Feb 1935 | Box 59 \ 3 Scan317 | |
| Alternative wiring diagram for Lucas type W.T. horns, proposing a method to use them without a relay unit. | 22th Feb 1935 | Box 59 \ 3 Scan318 | |
| The fitting of special Lucas horns to a 20/25 HP chassis GLG-5, including sending parts and a blueprint. | 23th Feb 1935 | Box 59 \ 3 Scan319 | |
| Requesting the repair of a broken horn junction box on a Spectre I chassis. | 2nd Mar 1935 | Box 59 \ 3 Scan320 | |
| The requirement to test electrically controlled wind horns under strenuous road conditions. | 20th May 1935 | Box 59 \ 3 Scan321 | |
| Request to Joseph Lucas Ltd for new type electrically controlled wind horns for testing on experimental cars. | 20th May 1935 | Box 59 \ 3 Scan322 | |
| Requesting the urgent acquisition of electrically controlled wind horns for a test car in France. | 22th May 1935 | Box 59 \ 3 Scan323 | |
| The standardisation tests of Lucas WT horns for various chassis models. | 23th May 1935 | Box 59 \ 3 Scan324 | |
| Requesting to fit a pair of Lucas WT horns to car 21.G.IV for a test in France. | 23th May 1935 | Box 59 \ 3 Scan325 | |
| Letter to Joseph Lucas Ltd. requesting a pair of standard WT horns for an endurance test on a 20/25 chassis. | 23th May 1935 | Box 59 \ 3 Scan326 | |
| Requesting the removal, adjustment, and refitting of electric horns on experimental cars 1.B.IV and 20.G.IV. | 25th May 1935 | Box 59 \ 3 Scan327 | |
| The fitting of electrically controlled wind horns to a car for testing purposes. | 5th Jun 1935 | Box 59 \ 3 Scan328 | |
| Delay in receiving electrically controlled wind horns from Lucas for a 10,000-mile test. | 6th Jun 1935 | Box 59 \ 3 Scan329 | |
| Letter from Joseph Lucas Limited regarding the supply of a pair of Wind Tone Horns for experimentation. | 7th Jun 1935 | Box 59 \ 3 Scan330 | |
| Urgent memo regarding the policy of fitting W.T. horns to the Olympia Spectre's. | 12th Jun 1935 | Box 59 \ 3 Scan331 | |
| Discussions with Messrs. Lucas about their new Wind Tone horns for the Spectre chassis. | 13th Jun 1935 | Box 59 \ 3 Scan332 | |
| The need to devise a scheme for fitting horns, a relay switch, and a tone switch to the 8 Spectre chassis for Olympia. | 13th Jun 1935 | Box 59 \ 3 Scan333 | |
| Letter to Joseph Lucas Ltd. regarding the delivery of W.T. horns without the agreed-upon changeover switch and requesting an amended wiring diagram. | 14th Jun 1935 | Box 59 \ 3 Scan334 | |
| Request to send a pair of new Lucas horns to France for testing on a Spectre car. | 14th Jun 1935 | Box 59 \ 3 Scan335 | |
| Correspondence regarding the dispatch of a Changeover Switch and a wiring diagram for W.T. Horns. | 15th Jun 1935 | Box 59 \ 3 Scan336 | |
| The testing and standardisation of Lucas Wind Tone Horns. | 15th Jun 1935 | Box 59 \ 3 Scan337 | |
| The order of Lucas Wind Tone horns and special brackets for the Spectre chassis. | 22th Jun 1935 | Box 59 \ 3 Scan338 | |
| Forwarding of two silent zone switches for chassis 103 TA. | 26th Jun 1935 | Box 59 \ 3 Scan339 | |
| Scheme to operate two-tone wind horns by rocking the existing Klaxon button. | 2nd Jul 1935 | Box 59 \ 3 Scan340 | |
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