| Description | Date | Identifier | |
| Dipping headlight method and the effectiveness of side lights. | 31th Oct 1922 | Box 61a \ 1 scan0152 | |
| Urgent internal order request for a 12-volt rear lamp for the Hawk Northcliffe car. | 11th Nov 1922 | Box 61a \ 1 scan0153 | |
| Replacement of C.A.V. dash lamps with alternatives from Culver-Stearns Mfg. Co. | 9th Nov 1922 | Box 61a \ 1 scan0154 | |
| Request to obtain a catalogue of lamps from Morris-Russel, issued by Culver-Stearns Mfg. Co. | 13th Nov 1922 | Box 61a \ 1 scan0155 | |
| Request for feedback on Barker dipping headlight parts for Mr. Royce's 40/50 car. | 15th Nov 1922 | Box 61a \ 1 scan0156 | |
| Explaining the inability to work on Goshawk left-hand controls due to other urgent projects. | 16th Nov 1922 | Box 61a \ 1 scan0157 | |
| Letter from Morris, Russell & Co. Ltd. enclosing a catalogue and promoting windscreen cleaners. | 16th Nov 1922 | Box 61a \ 1 scan0158 | |
| Letter to Morris-Russel requesting a catalogue of lamps from Culver-Stearns Manufacturing Co. | 14th Nov 1922 | Box 61a \ 1 scan0159 | |
| Catalogue for dash lamps from a company in Detroit. | 14th Nov 1922 | Box 61a \ 1 scan0160 | |
| Proposal for a dipping headlight mechanism using modified Lucas R850 lamps. | 22th Nov 1922 | Box 61a \ 1 scan0161 | |
| Continued memorandum regarding the supply of fittings to coachbuilders or customers. | 22th Nov 1922 | Box 61a \ 1 scan0162 | |
| The controls for the Goshawk 11 dipping headlights. | 22th Nov 1922 | Box 61a \ 1 scan0163 | |
| Modifications to the Barker dipping headlight scheme on Mr. Royce's car. | 23th Nov 1922 | Box 61a \ 1 scan0164 | |
| Extract discussing the dislike of an American-made instrument board lamp and plans for its replacement. | 5th Dec 1922 | Box 61a \ 1 scan0165 | |
| Extract discussing the implications of proposed new legislation regarding dipping headlights. | 5th Dec 1922 | Box 61a \ 1 scan0166 | |
| Potential legislation on dipping headlights and authorising experimental sets. | 12th Dec 1922 | Box 61a \ 1 scan0167 | |
| Instruction to return a Lucas headlamp to have a diffuser glass fitted instead of a plain one. | 13th Dec 1922 | Box 61a \ 1 scan0168 | |
| Letter to W.A.H. White declining a suggestion for lamp improvements, suggesting he contacts lamp manufacturers directly. | 22th Dec 1922 | Box 61a \ 1 scan0169 | |
| Correspondence regarding a submission to Messrs. Lucas for dipping headlights on the Goshawk 11 model. | 2nd Jan 1923 | Box 61a \ 1 scan0170 | |
| Letter from Joseph Lucas Ltd. regarding the design of dipping headlights for a 20HP chassis and regulations from the Lights on Vehicles Bill. | 30th Dec 1922 | Box 61a \ 1 scan0171 | |
| Inquiry about a dipping headlight system advertised by Barker for potential use on trials cars. | 18th Jan 1923 | Box 61a \ 1 scan0172 | |
| Query regarding an experiment for 'Goshawk 11' dipping headlights with Joseph Lucas Ltd. | 18th Jan 1923 | Box 61a \ 1 scan0173 | |
| Decision not to proceed with an experiment on Goshawk II dipping headlights due to impending legislation. | 18th Jan 1923 | Box 61a \ 1 scan0174 | |
| Correspondence regarding an order for a Lucas Tail Lamp for a 20 HP car. | 19th Jan 1923 | Box 61a \ 1 scan0175 | |
| 'Barker scheme' for dipping headlights and the development of a new system. | 30th Jan 1923 | Box 61a \ 1 scan0176 | |
| The trial of a hand-controlled dipping headlight system for the Goshawk 11. | 4th Apr 1923 | Box 61a \ 1 scan0177 | |
| Lever and model ball joints for dipping headlights on car 4-G-11. | 25th Jun 1923 | Box 61a \ 1 scan0178 | |
| Instructing the stores to despatch a Lever, Bracket, and two Ball Joints to Mr. W.W. Elliott. | 25th Jun 1923 | Box 61a \ 1 scan0179 | |
| The failure of dipping headlights from The Rapson Co. Ltd. on a 20 HP car due to issues with the operating cables. | 29th Jun 1923 | Box 61a \ 1 scan0180 | |
| Modifications to the 20 HP chassis head lamps, including height adjustments and dipping mechanisms. | 22th Jun 1923 | Box 61a \ 1 scan0181 | |
| Issues with the 20 HP dipping headlights, including handle load and rattling reflectors. | 4th Jul 1923 | Box 61a \ 1 scan0182 | |
| Development of a dimming switch and dipping headlamps for the 20.HP model. | 5th Sep 1923 | Box 61a \ 1 scan0183 | |
| Modifications to the Goshawk 11 dipping head lights and operating gear. | 8th Sep 1923 | Box 61a \ 1 scan0184 | |
| Request to reduce the torque of a twisting spring on an engine foot countershaft. | 21th Sep 1923 | Box 61a \ 1 scan0185 | |
| Fitment and modification of dipping headlamps on a 20 HP car. | 21th Sep 1923 | Box 61a \ 1 scan0186 | |
| Sending two sets of Rapson Dipping Head-light fittings to the Stores for despatch. | 28th Sep 1923 | Box 61a \ 1 scan0187 | |
| Delay of revised dipping headlamps for a 20 HP All-Weather, instructing to fit fixed lights temporarily. | 8th Sep 1923 | Box 61a \ 1 scan0188 | |
| Development of an in-house dipping headlight system for the 20 HP model. | 13th Oct 1923 | Box 61a \ 1 scan0189 | |
| Issues with the Barker headlamp dipping scheme and requesting information on a new system seen on Mr. Royce's car. | 19th Oct 1923 | Box 61a \ 1 scan0190 | |
| Modifications and standardisation of dipping headlights for the 20 HP chassis. | 10th Oct 1923 | Box 61a \ 1 scan0191 | |
| Letter concerning unreceived nickel-plated headlight fittings from Messrs. Rapson. | 6th Dec 1923 | Box 61a \ 1 scan0192 | |
| Receiving and fitting dipping head lights from Messrs. Lucas onto a car for examination. | 28th Dec 1923 | Box 61a \ 1 scan0193 | |
| Letter concerning missing Nickel Plated Rods for Rapson Dipping Headlight Fittings. | 28th Dec 1923 | Box 61a \ 1 scan0194 | |
| Letter from Rapson Tyre & Jack Co. Ltd. regarding missing nickel-plated rods for 'Dipping' Headlight Fittings. | 21th Dec 1923 | Box 61a \ 1 scan0195 | |
| The inability to trace Rapson dipping headlight fittings, recommending the cost be charged to the Experimental Department. | 29th Dec 1923 | Box 61a \ 1 scan0196 | |
| Proposing a 20 HP car be sent to London for examination and approval of its dipping headlights. | 30th Jan 1924 | Box 61a \ 1 scan0197 | |
| The testing and improvement of dipping headlights for the 20 HP model. | 1st Jan 1924 | Box 61a \ 1 scan0198 | |
| Potential to make dipping headlamps standard on the Goshawk model. | 9th Feb 1924 | Box 61a \ 1 scan0199 | |
| Comparing the effect of R.R. and Barker dipping headlights on a 20 HP car. | 12th Feb 1924 | Box 61a \ 1 scan0200 | |
| Design and performance of a dipping headlight mechanism. | 9th Feb 1924 | Box 61a \ 1 scan0201 | |
| Extract from a sales visit report discussing criticisms and modifications for dipping headlights. | 12th Feb 1924 | Box 61a \ 1 scan0202 | |
| Optimal angle for dipping headlights, comparing the Barker scheme with tests on Lucas lamps. | 14th Feb 1924 | Box 61a \ 1 scan0203 | |
| Dipping angle of headlights for the 20 HP and Goshawk models, referencing the 40/50 HP. | 2nd Feb 1924 | Box 61a \ 1 scan0204 | |
| The design specifics for dipping head lights, including the fork tube and spring mechanism. | 2nd Feb 1924 | Box 61a \ 1 scan0205 | |
| To Mr. Chatwin regarding a damaged Lucas side lamp to be returned to the manufacturer for repair. | 27th Mar 1924 | Box 61a \ 1 scan0206 | |
| Design of dipping headlights, noting criticisms of a previous model and suggesting improvements. | 4th Jun 1924 | Box 61a \ 1 scan0207 | |
| Design options and preferences for dipping headlights for model EAC.2, referencing a previous Goshawk design. | 20th Jun 1924 | Box 61a \ 1 scan0208 | |
| Sending a car fitted with new type dipping headlights to London for sales examination. | 2nd Jul 1924 | Box 61a \ 1 scan0209 | |
| Request for a sample of the latest dipping headlamp design for standardisation purposes. | 2nd Jul 1924 | Box 61a \ 1 scan0210 | |
| Confirmation of a wire regarding sending a Goshawk with specific lamps and cabling. | 4th Jul 1924 | Box 61a \ 1 scan0211 | |
| Inability to fit a Goshawk car with 25° dipping headlamps as requested by Sales. | 1st Jul 1924 | Box 61a \ 1 scan0212 | |
| Requested modifications for dipping head lights on a 20 HP chassis. | 4th Jul 1924 | Box 61a \ 1 scan0213 | |
| Fitting of dipping headlights to 20 HP cars. | 7th Jul 1924 | Box 61a \ 1 scan0214 | |
| Requesting an update on the design for Goshawk dipping headlamps. | 10th Jul 1924 | Box 61a \ 1 scan0215 | |
| Secret memorandum discussing modifications to the front end of a car, specifically the dipping head lights. | 18th Jul 1924 | Box 61a \ 1 scan0216 | |
| Alteration or refitting of dipping headlamps on car 4-GII. | 21th Jul 1924 | Box 61a \ 1 scan0217 | |
| Short memo regarding the fixing and sending of dipping head lights. | 24th Jul 1924 | Box 61a \ 1 scan0218 | |
| Secret memorandum concerning the design and fittings for a new model's bonnet and dashboard. | 15th Sep 1924 | Box 61a \ 1 scan0219 | |
| Secret memo regarding the design and fitting of dipping headlamps for Mr Royce's new car. | 9th May 1925 | Box 61a \ 1 scan0220 | |
| Sending a damaged Lucas tail lamp for a 40/50 HP vehicle to the stores for repair. | 18th Jul 1925 | Box 61a \ 1 scan0221 | |
| The return of a Lucas rear lamp to the makers for repair. | 7th Sep 1925 | Box 61a \ 1 scan0222 | |
| The return of a Lucas tail lamp to the makers for repair. | 28th Nov 1925 | Box 61a \ 1 scan0223 | |
| Requesting the exchange of incorrect double-pole tail lamp bulb holders for single-pole ones. | 11th Jan 1926 | Box 61a \ 1 scan0224 | |
| Instructing the return of tail lamps to Messrs. Lucas for repair. | 12th Jan 1926 | Box 61a \ 1 scan0225 | |
| Sheet metal wing stays and fixed headlamps for chassis EAC.8. | 2nd Feb 1926 | Box 61a \ 1 scan0226 | |
| Requesting the return of two Lucas Tail lamps to the manufacturer for repair. | 11th Feb 1926 | Box 61a \ 1 scan0227 | |
| Instruction to Messrs. Lucas to carry out repairs on tail lamps. | 18th Feb 1926 | Box 61a \ 1 scan0228 | |
| Tail lamp being sent to stores for return to Messrs. Lucas for repair. | 20th Feb 1926 | Box 61a \ 1 scan0229 | |
| Returning incorrect double-pole lamp holders to the supplier, Lucas, and requesting single-pole replacements. | 2nd Feb 1926 | Box 61a \ 1 scan0230 | |
| Return of a Lucas Tail Lamp to the maker for repair. | 20th Jan 1926 | Box 61a \ 1 scan0231 | |
| Instructions for returning two Lucas Double-pole Lamp Holders to the manufacturer for replacement. | 24th Feb 1926 | Box 61a \ 1 scan0232 | |
| Correspondence regarding the return of incorrect lamp holders to J. Lucas Limited and receiving replacement adaptors. | 3rd Mar 1926 | Box 61a \ 1 scan0233 | |
| Letter from Flexible Lamps Ltd. regarding their 'Rubbolite' unbreakable rubber tail lamps. | 20th Mar 1926 | Box 61a \ 1 scan0234 | |
| Requesting a Lucas tail lamp be returned to the makers for repair of a single pole lamp holder. | 21th Jun 1926 | Box 61a \ 1 scan0235 | |
| Quality and superiority of continental Carl Zeiss headlamps over English Lucas lamps. | 23th Jul 1926 | Box 61a \ 1 scan0236 | |
| Improved sample lamp from Flexible Lamps Ltd, comparing its finish and price to a Lucas lamp. | 1st Aug 1926 | Box 61a \ 1 scan0237 | |
| Letter to Lucas Electrical Co. Ltd. about the benefits and operation of double filament headlamp bulbs. | 23th Aug 1926 | Box 61a \ 1 scan0238 | |
| Page two of a letter discussing the search for more powerful headlamps for the 40/50 car. | 25th Aug 1926 | Box 61a \ 1 scan0239 | |
| Letter from Joseph Lucas Limited discussing the performance of double filament headlamp bulbs. | 25th Aug 1926 | Box 61a \ 1 scan0240 | |
| Letter from Joseph Lucas Ltd. discussing headlamp bulb technology and test results. | 25th Aug 1926 | Box 61a \ 1 scan0241 | |
| Letter from Joseph Lucas Ltd. discussing the exterior shape and size of a lamp casing. | 25th Aug 1926 | Box 61a \ 1 scan0242 | |
| Letter to supplier J. Lucas Ltd. giving feedback and requirements for a new headlamp design. | 30th Aug 1926 | Box 61a \ 1 scan0243 | |
| Authorizing the acquisition of a pair of Carl Zeiss headlamps for a 10-EX Phantom-Barker sports car. | 30th Aug 1926 | Box 61a \ 1 scan0244 | |
| Letter to J. Lucas Ltd. regarding the design and features of a new headlamp. | 30th Aug 1926 | Box 61a \ 1 scan0245 | |
| Extract suggesting the Phantom (10-EX) would be a good car to fit with Zeiss headlamps. | 23th Sep 1926 | Box 61a \ 1 scan0246 | |
| Confidential memo regarding Sheffield Simplex dipping lamps and their application to a standard Phantom. | 1st Oct 1926 | Box 61a \ 1 scan0247 | |
| Letter to Sheffield-Simplex Ltd requesting a set of dipping lamps for testing on a Phantom car. | 5th Oct 1926 | Box 61a \ 1 scan0248 | |
| Seeking clarification on the term 'paper shanks', believed to be 'taper shanks', in relation to dipping headlights. | 11th Oct 1926 | Box 61a \ 1 scan0249 | |
| Letter to Sheffield-Simplex Ltd requesting the supply of standard dipping headlamp fittings for a 40/50 Phantom chassis. | 12th Oct 1926 | Box 61a \ 1 scan0250 | |
| Letter from The Sheffield Simplex Company regarding the dispatch of a set of Automatic Dipping Headlight fittings for a 'New Phantom' chassis. | 13th Oct 1926 | Box 61a \ 1 scan0251 | |
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