| Description | Date | Identifier | |
| Comparing the Lucas horns and their fittings on Phantom III models 32-EX, 26.G.VI, and 37-EX. | 4th Aug 1937 | Box 166 \ 9 img127 | |
| Non-standard screws and horns fitted to a Phantom III. | 4th Aug 1937 | Box 166 \ 9 img128 | |
| Cancelled internal request to obtain one pair of W.T.13 horns from Messrs Lucas for the Phantom III Chassis. | 10th Aug 1937 | Box 166 \ 9 img129 | |
| Requesting approval to detail a modified horn button for the PH.III and Wraith models. | 13th Aug 1937 | Box 166 \ 9 img130 | |
| Modifications and issues with Lucas WT. Horns, comparing the WT.11X and WT.13 types. | 19th Aug 1937 | Box 166 \ 9 img131 | |
| To cancel an order for one pair of Lucas WT.13 horns as they are not currently in production. | 8th Sep 1937 | Box 166 \ 9 img132 | |
| Notice to cancel an order for Phantom III Chassis Horns as the part is no longer in production. | 10th Sep 1937 | Box 166 \ 9 img133 | |
| Modification to the Phantom III horn brackets to prevent fracturing. | 15th Sep 1937 | Box 166 \ 9 img134 | |
| Letter to Lucas Ltd. requesting clarification on modifications to a pair of wind-tone horns supplied for testing. | 15th Sep 1937 | Box 166 \ 9 img135 | |
| Letter discussing progress on the R.R.P.100 'Open' type headlamps and their special glass. | 21th Sep 1937 | Box 166 \ 9 img136 | |
| Letter from Joseph Lucas Limited clarifying the differences between the WT13 and WT11 horns. | 21th Sep 1937 | Box 166 \ 9 img137 | |
| Letter from Joseph Lucas Limited discussing alterations to a component, specifically the diaphragm frequency, flare position, and trumpet slots. | 21th Sep 1937 | Box 166 \ 9 img138 | |
| Letter to Joseph Lucas Ltd. regarding test results for WT.13 horns and a delay in testing LRT.7 regulators. | 5th Oct 1937 | Box 166 \ 9 img139 | |
| The conclusion of a letter detailing the adjustment of a component to its lowest limit of 12.2 volts. | 5th Oct 1937 | Box 166 \ 9 img140 | |
| Request to dispatch one pair of Lucas W.T.13 type horns to be brought up to date. | 5th Oct 1937 | Box 166 \ 9 img141 | |
| Letter from Joseph Lucas Limited regarding the performance and return of a horn and a regulator. | 7th Oct 1937 | Box 166 \ 9 img142 | |
| Returning a pair of Lucas W.T.13 type horns to be brought up to date. | 7th Oct 1937 | Box 166 \ 9 img143 | |
| Request to remove experimental Lucas W.T.13 type horns from cars 33-EX and 36-EX. | 12th Oct 1937 | Box 166 \ 9 img144 | |
| The return of two pairs of Lucas W.T.13 horns for modification. | 18th Oct 1937 | Box 166 \ 9 img145 | |
| The return of two pairs of Lucas W.T.13 horns for modification. | 18th Oct 1937 | Box 166 \ 9 img146 | |
| Revised and simplified horn switch for the Wraith III model. | 20th Oct 1937 | Box 166 \ 9 img147 | |
| Blueprints and production notes for the Wraith III Horn Switch. | 3rd Nov 1937 | Box 166 \ 9 img148 | |
| The fitting of experimental Lucas wind horns to specific vehicles. | 10th Nov 1937 | Box 166 \ 9 img149 | |
| The receipt and fitting of modified Lucas W.T.13 horns for testing on two cars. | 19th Nov 1937 | Box 166 \ 9 img150 | |
| The return of six pairs of Lucas WT.11.X Wind Tone horns for renovation and stocking. | 4th Dec 1937 | Box 166 \ 9 img151 | |
| Return of Lucas Wind Tone horns for renovation instead of scrapping. | 7th Dec 1937 | Box 166 \ 9 img152 | |
| Testing and standardisation of Lucas WT.13 type horns. | 13th Jan 1938 | Box 166 \ 9 img153 | |
| Requesting a covering order for two pairs of Lucas W.T.13 type windtone horns. | 28th Jan 1938 | Box 166 \ 9 img154 | |
| Investigation into the lack of reliability of Lucas 'Mellotone' Electric Horns. | 14th Feb 1938 | Box 166 \ 9 img155 | |
| Advertisement for 'The Powerfully Polite' Mellow Tone Clear-Hooter car horns. | 24th Feb 1937 | Box 166 \ 9 img156 | |
| Letter from Clear Hooters Ltd offering electric horns for original equipment. | 22th Feb 1938 | Box 166 \ 9 img157 | |
| Advertisement for Clear Hooters high-frequency electric horns, models H.F. 500 and H.F. 180. | 28th Feb 1938 | Box 166 \ 9 img158 | |
| Requesting to change the Windstone horns on specific vehicles due to their ugly frontal appearance. | 28th Feb 1938 | Box 166 \ 9 img159 | |
| Request to obtain a pair of De-Luxe Mellow Tone horns on loan from Clear-Hooters. | 1st Mar 1938 | Box 166 \ 9 img160 | |
| Invoice from Clear Hooters Ltd. for a pair of electric horns. | 23th Mar 1938 | Box 166 \ 9 img161 | |
| Requesting a replacement trumpet for a damaged Lucas Windtone WT.13 horn. | 23th Mar 1938 | Box 166 \ 9 img162 | |
| Despatch instructions for a WT.13 type Windtone Horn Trumpet for a Wraith Experimental model to J. Lucas Ltd. | 23th Mar 1938 | Box 166 \ 9 img163 | |
| The unsatisfactory test results for a pair of 'clear Hooter' horns, instructing their return to the makers. | 24th Mar 1938 | Box 166 \ 9 img164 | |
| Horn failure on car 25.G.VI. | 8th Apr 1938 | Box 166 \ 9 img165 | |
| Requesting the return of experimental WT.13 type horns to the makers for overhaul. | 5th May 1938 | Box 166 \ 9 img166 | |
| The forwarding of two W.T.13 type Lucas Horns for overhaul and adjustment. | 6th May 1938 | Box 166 \ 9 img167 | |
| Letter to Lucas Ltd. concerning the failure of WT.13 type horns after a 21,000-mile test run. | 5th May 1938 | Box 166 \ 9 img168 | |
| Costs of protecting the horn wire in the steering column from petrol and oil. | 20th May 1938 | Box 166 \ 9 img170 | |
| Horns failing during rain on car 29.G.VI and a request for their replacement. | 15th Jun 1938 | Box 166 \ 9 img172 | |
| Recommending the sale of obsolete WT.11 type Lucas windscreen horns. | 22th Jul 1938 | Box 166 \ 9 img173 | |
| Recommending the sale of a pair of used WT.11.X type horns for ten shillings. | 18th Aug 1938 | Box 166 \ 9 img174 | |
| New noise regulations for vehicle horns and their impact on the Phantom and Bentley chassis. | 18th Mar 1938 | Box 166 \ 9 img175 | |
| Proposal to introduce Mellotone Horns on Bentley 'M' Series cars. | 3rd Sep 1938 | Box 166 \ 9 img176 | |
| Change of horns on the Bentley 'M' Series to comply with Ministry regulations on noise levels. | 3rd Sep 1938 | Box 166 \ 9 img177 | |
| Requesting the replacement of car horns and an indicator bulb. | 24th Oct 1938 | Box 166 \ 9 img178 | |
| Request to arrange the return of faulty Lucas WT.13 horns from a Bentley car for examination. | 29th Nov 1938 | Box 166 \ 9 img179 | |
| Letter to Joseph Lucas Ltd. regarding a faulty horn on a Bentley car and requesting an investigation. | 29th Nov 1938 | Box 166 \ 9 img180 | |
| Letter from Joseph Lucas Ltd regarding the examination of a pair of Windtone Horns after a 15,000-mile trial. | 12th Dec 1938 | Box 166 \ 9 img181 | |
| Investigation report on the failure of Lucas Wind tone Horns during a 15,000-mile trial. | 13th Dec 1938 | Box 166 \ 9 img182 | |
| Submission of WT.23 Wind Tone Horns for testing on the Wraith. | 19th Dec 1938 | Box 166 \ 9 img183 | |
| The road testing and fitting of experimental horns type WT.23 to a Wraith car. | 18th Jan 1939 | Box 166 \ 9 img184 | |
| Notification about a change in the mounting position of the Horn Relay Unit for the Bentley V model. | 20th Jan 1939 | Box 166 \ 9 img185 | |
| Letter detailing the temporary failure of WT.13 type horns in cold weather on an Experimental Bentley car. | 9th Feb 1939 | Box 166 \ 9 img186 | |
| Letter discussing a fault with car horns, suspecting distortion from low temperatures, and proposing sending them for repair. | 9th Feb 1939 | Box 166 \ 9 img187 | |
| The removal and return of failing Lucas horns from a Bentley car. | 9th Feb 1939 | Box 166 \ 9 img188 | |
| Instruction to dispatch a pair of WT-13 Wind Tone Horns to J. Lucas Ltd. for examination and report. | 13th Feb 1939 | Box 166 \ 9 img189 | |
| Letter from Joseph Lucas Ltd. regarding a failure of WT.13 horns on Experimental Bentley No. 7.B.V. | 13th Feb 1939 | Box 166 \ 9 img190 | |
| Fitting of lamps, horns, and brackets to a Silver Wraith. | 17th Feb 1939 | Box 166 \ 9 img191 | |
| The testing and development of Lucas Wind Tone Horns, Type WT.23, compared to the standard WT.13. | 23th Feb 1939 | Box 166 \ 9 img192 | |
| Test report on car horns, detailing electrical measurements and pitch. | 23th Feb 1939 | Box 166 \ 9 img193 | |
| Letter from Joseph Lucas Ltd regarding W.T.13 Wind-tone Horns removed from an experimental Bentley. | 14th Mar 1939 | Box 166 \ 9 img194 | |
| Report from Joseph Lucas Ltd. on the examination and failure analysis of a returned pair of defective WT13 horns. | 10th Mar 1939 | Box 166 \ 9 img195 | |
| The re-conditioning of two horns, noting the performance of sand castings versus die-castings. | 10th Mar 1939 | Box 166 \ 9 img196 | |
| Letter chasing J.Lucas Ltd. for a report on a pair of failed W.T.13 Wind Tone Horns. | 10th Mar 1939 | Box 166 \ 9 img197 | |
| The removal and return of faulty Lucas wind horns from a Bentley car for repair. | 9th Feb 1939 | Box 166 \ 9 img198 | |
| Letter to J. Lucas Ltd. regarding the failure of WT-13 Wind Tone Horns fitted to an experimental car. | 13th Feb 1939 | Box 166 \ 9 img199 | |
| Request to order Lucas H.F. Horns and associated K parts for chassis 4.B.50 'Cresta'. | 18th May 1939 | Box 166 \ 9 img200 | |
| Requesting an order for high-frequency horns for testing on cars in France. | 20th Jun 1939 | Box 166 \ 9 img201 | |
| The trial of experimental Lucas wind tone horns on car 25.G.VI. | 28th Jun 1939 | Box 166 \ 9 img202 | |
| Internal order for Mellotone horns and fittings for the 'Cresta' chassis. | 20th Jul 1939 | Box 166 \ 9 img203 | |
| Letter to Joseph Lucas Ltd. concerning a control box and horns. | 27th Aug 1941 | Box 166 \ 9 img204 | |
| Letter to Joseph Lucas Ltd. requesting an outline drawing of WT.26 horns and information on a device for controlling engine speed for tank work. | 5th Sep 1941 | Box 166 \ 9 img205 | |
| Letter from Joseph Lucas Ltd. regarding an outline drawing for Model WT28 electric horns. | 17th Sep 1941 | Box 166 \ 9 img206 | |
| Letter from McNaught Lamps Limited regarding discounts and forwarding a 7' All-Chrome Fog & Spot Lamp. | 19th Oct 1935 | Box 167 \ 1 img001 | |
| Advertisement leaflet for McNaught Fog and Spot Lamps. | 5th Feb 1935 | Box 167 \ 1 img002 | |
| Promotional leaflet for McNaught Lamps, featuring unsolicited customer testimonials and pricing for their fog lamps. | 5th Feb 1935 | Box 167 \ 1 img003 | |
| Request for a fog and spot lamp on approval from Mc.Naught Lamps, Limited. | 18th Oct 1935 | Box 167 \ 1 img004 | |
| Letter from The Trippe Safety Speed Light Co. Ltd. providing recommendations for fitting their auxiliary fog lamp. | 2nd Sep 1935 | Box 167 \ 1 img005 | |
| Letter from The Trippe Safety Speed Light Co. Ltd. regarding the supply, features, and trial of their lamps. | 2nd Sep 1935 | Box 167 \ 1 img006 | |
| Explaining the working principles of the Trippe Lamp, focusing on its parabolic reflector design. | 2nd Sep 1935 | Box 167 \ 1 img007 | |
| From The Trippe Safety Speed Light Co. Ltd. describing the function and design of anti-dazzle lamp reflectors. | 2nd Sep 1935 | Box 167 \ 1 img008 | |
| Page 3 of a document from The Trippe Safety Speed Light Co. describing a lamp and its bulb mask. | 2nd Sep 1935 | Box 167 \ 1 img009 | |
| The design and function of the Trippe Lamp for optimal performance in fog. | 2nd Sep 1935 | Box 167 \ 1 img010 | |
| From The Trippe Safety Speed Light Co. Ltd. discussing the effectiveness of their fog lamp. | 12th Nov 1935 | Box 167 \ 1 img011 | |
| The delivery of two non-glaring fog lamps from Notek Electric Company. | 12th Nov 1935 | Box 167 \ 1 img012 | |
| Letter from Notek Electric Company regarding the testing of their non-glaring fog and traffic lamps. | 11th Nov 1935 | Box 167 \ 1 img013 | |
| Letter from Notek Electric Company Limited regarding a technical matter. | 11th Nov 1935 | Box 167 \ 1 img014 | |
| Responding to a telegram request for Bentley lamps, confirming their despatch and advising of a delay with the grids. | 18th May 1936 | Box 167 \ 1 img015 | |
| Circulating a copy of the Statutory Rules and Orders 1936, No. 392, concerning vehicle lighting and headlamps. | 19th May 1936 | Box 167 \ 1 img016 | |
| Statutory document outlining the Road Vehicles Lighting Regulations from 1936. | 30th Apr 1936 | Box 167 \ 1 img017 | |
| Page from a legal document detailing regulations for vehicle lighting, specifically the positioning and character of front lamps. | 30th Apr 1936 | Box 167 \ 1 img018 | |
| Regulations for vehicle lamps, including beam deflection, anti-dazzle requirements, and bulb markings. | 30th Apr 1936 | Box 167 \ 1 img019 | |
| Page of regulations concerning vehicle lighting, reflectors, and their usage. | 30th Apr 1936 | Box 167 \ 1 img020 | |
| Regulations for vehicle reflectors, white surfaces, and the dimensions and lighting of hand-drawn vehicles. | 30th Apr 1936 | Box 167 \ 1 img021 | |
| Page from a legal instrument detailing regulations for vehicle lighting and parking. | 30th Apr 1936 | Box 167 \ 1 img022 | |
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