| Description | Date | Identifier | |
| Letter to Joseph Lucas Ltd regarding the development of dipping and twisting P.100 headlamps for a car being made for Mr Royce's use. | 15th Oct 1928 | Box 61a \ 1 scan0352 | |
| Letter discussing the design of a mechanical dipping headlamp control mechanism, including a diagram. | 15th Oct 1928 | Box 61a \ 1 scan0353 | |
| Proposed improvements for the Phantom and 'SS' models, focusing on the tool kit, side lamps, and windscreen wiper. | 17th Oct 1928 | Box 61a \ 1 scan0354 | |
| The effort to acquire bulbs for a bifocal dimming system. | 17th Oct 1928 | Box 61a \ 1 scan0355 | |
| Requesting samples of Bi-focal headlamp bulbs, including a sketch with socket dimensions. | 17th Oct 1928 | Box 61a \ 1 scan0356 | |
| Urgent request to obtain Bifocal bulbs for P.100 Lucas lamps to be tried on Mr. Royce's car. | 17th Oct 1928 | Box 61a \ 1 scan0357 | |
| The sourcing of bulbs for bifocal dimming. | 17th Oct 1928 | Box 61a \ 1 scan0358 | |
| Request for samples of Bi-focal headlamp bulbs, including a dimensioned sketch. | 17th Oct 1928 | Box 61a \ 1 scan0359 | |
| The acquisition of double filament lamp bulbs with standard-sized sockets. | 8th Oct 1928 | Box 61a \ 1 scan0360 | |
| Letter from The General Electric Co Ltd confirming an order for a 12 volt 60 watt filament bulb. | 19th Oct 1923 | Box 61a \ 1 scan0361 | |
| Letter from Brown Brothers Ltd. declining to quote for Bifocal Bulbs and suggesting alternative suppliers. | 19th Oct 1928 | Box 61a \ 1 scan0362 | |
| The standardization of dipping headlamps for the Standard Phantom model. | 19th Oct 1928 | Box 61a \ 1 scan0363 | |
| Process of chromium plating on nickel silver and instructions for specific vehicle parts. | 20th Oct 1928 | Box 61a \ 1 scan0364 | |
| The standardisation of dipping headlamps for the Phantom model. | 22th Oct 1928 | Box 61a \ 1 scan0365 | |
| Request for particulars on electrically operated dipping reflector headlamps and operating switches. | 22th Oct 1928 | Box 61a \ 1 scan0366 | |
| Letter from Philips Lamps Limited acknowledging a request for a new type of headlamp for Lucas P.100, advising of a supply delay. | 22th Oct 1928 | Box 61a \ 1 scan0367 | |
| Letter from General Electric Co., Ltd. regarding the suitability of their Bifocal lamps for British headlights. | 23th Oct 1928 | Box 61a \ 1 scan0368 | |
| From Springfield to Derby regarding the supply of Bifocal Headlamps and the substitution of 12-volt bulbs with 6-volt versions. | 23th Oct 1928 | Box 61a \ 1 scan0369 | |
| Letter from Edison Swan Electric Co. Ltd. regarding the inability to supply a lamp and offering to manufacture one from a sample. | 23th Oct 1928 | Box 61a \ 1 scan0370 | |
| Typed letter inquiring about the supply of Bifocal Bulbs for a Lucas P.100 lamp. | 24th Oct 1928 | Box 61a \ 1 scan0371 | |
| Letter to G.E.Co. Ltd. regarding the specifications and purpose of double-filament Bifocal Lamps. | 24th Oct 1928 | Box 61a \ 1 scan0372 | |
| Enquiry to The Lucas Electrical Co. Ltd. regarding the suitability of G.E.C. bifocal headlamp bulbs. | 24th Oct 1928 | Box 61a \ 1 scan0373 | |
| Letter from Joseph Lucas Limited regarding electrically operated dippers. | 24th Oct 1928 | Box 61a \ 1 scan0374 | |
| The order of a pneumatic operating cylinder and parts from Messrs. Lucas for a dipping reflector on an experimental chassis. | 24th Oct 1928 | Box 61a \ 1 scan0375 | |
| Letter to The Lucas Elec. Co. Ltd. arranging a meeting regarding electrically operated dippers. | 25th Oct 1928 | Box 61a \ 1 scan0376 | |
| Requesting an order be placed with the American Company for Tilt-ray headlamps. | 26th Oct 1928 | Box 61a \ 1 scan0377 | |
| List of approved headlighting devices, rear lamps, and headlight instructions from the Commonwealth of Massachusetts. | 15th Mar 1928 | Box 61a \ 1 scan0378 | |
| Instructions for maintaining, focusing, and aiming headlamp reflectors and bulbs. | 1st Jan 1923 | Box 61a \ 1 scan0379 | |
| Proposing to send a pair of Guide Tilt-Ray Headlamps, detailing cost, shipping, and enclosing an adaptation blueprint. | 15th Oct 1928 | Box 61a \ 1 scan0380 | |
| Letter about the potential manufacture of Bifocal bulbs for a Lucas P.100 lamp. | 27th Oct 1928 | Box 61a \ 1 scan0381 | |
| Letter from General Electric Co., Ltd. regarding an enquiry for Bifocal Lamps, suggesting they are an experimental batch for Joseph Lucas & Co. | 29th Oct 1928 | Box 61a \ 1 scan0382 | |
| Letter from The General Electric Co Ltd acknowledging a letter and forwarding it to their Head Office. | 29th Oct 1928 | Box 61a \ 1 scan0383 | |
| Questioning the standardisation of dipping headlights for the Standard and Continental Phantom models. | 29th Oct 1928 | Box 61a \ 1 scan0384 | |
| Instructions for a Hooper Sedanca, advising of the dispatch of Lucas and Alvis lamps. | 30th Oct 1928 | Box 61a \ 1 scan0385 | |
| Letter from Joseph Lucas Ltd. regarding the technical specifications and disadvantages of Bifocal Bulbs for headlamps. | 30th Oct 1928 | Box 61a \ 1 scan0386 | |
| The limitations of bifocal bulbs and an overview of alternative headlamp solutions, including the P.100 model with a dipped beam. | 30th Oct 1928 | Box 61a \ 1 scan0387 | |
| Letter from Joseph Lucas Limited regarding resolved difficulties with the R.160.S and the possibility of using the RB.160.S type lamp for the 20 HP Car. | 30th Oct 1928 | Box 61a \ 1 scan0388 | |
| Letter from the American branch to the Derby branch regarding the pros and cons of 6-volt vs 12-volt bifocal lamp bulbs. | 30th Oct 1928 | Box 61a \ 1 scan0389 | |
| Headlight design comparing 'faked' and true parabola systems, and the principle of the 'Depressed Beam'. | 20th Mar 1929 | Box 61a \ 1 scan0390 | |
| Drawing of a Dispersive Lens and a Compensating Lens for headlamps. | 20th Mar 1929 | Box 61a \ 1 scan0391 | |
| Letter from Joseph Lucas Limited regarding the characteristics and performance of bifocal headlamp bulbs. | 30th Oct 1928 | Box 61a \ 1 scan0392 | |
| Letter from Joseph Lucas Ltd. discussing the technical limitations of bifocal headlamp bulbs and alternative P.100 headlamps. | 30th Oct 1928 | Box 61a \ 1 scan0393 | |
| Letter from Joseph Lucas Ltd. discussing dipped beam headlamp designs, including an auxiliary bulb system and a mechanically operated reflector. | 30th Oct 1928 | Box 61a \ 1 scan0394 | |
| Bifocal Dipping headlamps and correspondence with the supplier Lucas. | 13th Nov 1928 | Box 61a \ 1 scan0395 | |
| The production status of 12-16 volt headlamp bulbs from the General Electric Company. | 5th Nov 1928 | Box 61a \ 1 scan0396 | |
| Technical memorandum regarding the selection and fitting of dipping lamps for various car models. | 7th Nov 1928 | Box 61a \ 1 scan0397 | |
| Standardisation of chassis parts for 40/50 headlamps. | 4th Oct 1928 | Box 61a \ 1 scan0398 | |
| Note stating that lamps are not part of the standard chassis and are an extra charge if supplied. | 10th Nov 1928 | Box 61a \ 1 scan0399 | |
| Double-contact sample bulbs for headlamps from Philips Lamps Ltd. | 10th Nov 1928 | Box 61a \ 1 scan0400 | |
| Receiving the wrong type of headlamp bulbs from Philips for the Lucas P.100 headlamp. | 10th Nov 1928 | Box 61a \ 1 scan0401 | |
| Bifocal dipping lamps, the availability of 36-watt bulbs, and correcting a chassis reference. | 15th Nov 1928 | Box 61a \ 1 scan0402 | |
| Instructions for dipping lamps on new experimental cars. | 15th Nov 1928 | Box 61a \ 1 scan0403 | |
| Instructions for mounting 'SS' front wing stays, headlamps, and number plate for car 18-EX. | 16th Nov 1928 | Box 61a \ 1 scan0404 | |
| Sourcing and fitting of lamps for car 18-EX, including alternatives to the specified Lucas Dipping lamps. | 19th Nov 1928 | Box 61a \ 1 scan0405 | |
| The issues found with the Barker dipping headlamps on a trials car. | 21th Nov 1928 | Box 61a \ 1 scan0406 | |
| Letter from Joseph Lucas Limited confirming the dispatch of Sidelamps, bulbs, and P.100 Projectors. | 21th Nov 1928 | Box 61a \ 1 scan0407 | |
| Implementation of a three-lamp scheme and the sourcing of Lucas and Bosch parts for car lighting. | 22th Nov 1928 | Box 61a \ 1 scan0408 | |
| Supply of lamps and switches for car model 18-EX. | 23th Nov 1928 | Box 61a \ 1 scan0409 | |
| The installation of Lucas type RB.160S headlamps with a pneumatic dipping reflector on chassis 10-G3. | 27th Nov 1928 | Box 61a \ 1 scan0410 | |
| Improvements to the Barker head lamp dipping device on a trials car. | 27th Nov 1928 | Box 61a \ 1 scan0411 | |
| Procurement and fitting of Lucas P.100 dipping reflector headlamps for cars 19 and 20 EX. | 28th Nov 1928 | Box 61a \ 1 scan0412 | |
| Accessories for the 19-EX Hooper Sedanca model. | 28th Nov 1928 | Box 61a \ 1 scan0413 | |
| Sending two 12-volt Graves Anti-Dazzle Lamps and a letter concerning bulbs. | 28th Nov 1928 | Box 61a \ 1 scan0414 | |
| Letter from C.A. Vandervell & Co. Ltd. regarding the suitability of Graves Anti-Dazzle Bulbs for Lucas P.100 Headlamps. | 21th Nov 1928 | Box 61a \ 1 scan0415 | |
| Accessories for the 19-EX car. | 29th Nov 1928 | Box 61a \ 1 scan0416 | |
| Two-filament headlamp bulbs and the defects of 'Wood-lites' headlamps. | 30th Nov 1928 | Box 61a \ 1 scan0417 | |
| Letter from Edison Lamp Works discussing two-filament 'Woodlites' headlamps. | 27th Nov 1928 | Box 61a \ 1 scan0418 | |
| Letter discussing the adoption and types of fixed focus two-filament headlamps. | 3rd Dec 1928 | Box 61a \ 1 scan0419 | |
| Notification of the dispatch of special stream-line wing lamps for Experimental Car No. 19-EX. | 3rd Dec 1928 | Box 61a \ 1 scan0420 | |
| Letter to J. Lucas & Co. Ltd discussing difficulties and suggestions for producing mechanically dipping and twisting headlamp reflectors. | 6th Dec 1928 | Box 61a \ 1 scan0421 | |
| Written note discussing vibration issues with the 'SS' third lamp and suggestions for stiffening the bracket and relocating the number plate. | 6th Dec 1928 | Box 61a \ 1 scan0422 | |
| Extract from a letter to Messrs. Lucas regarding the loan of double filament bulbs for inspection. | 6th Dec 1928 | Box 61a \ 1 scan0423 | |
| Request to obtain one Black Lucas Tail Lamp S.221. | 11th Dec 1928 | Box 61a \ 1 scan0424 | |
| Letter to Joseph Lucas Ltd. discussing designs and testing for P.100 and RS.160 headlamps. | 18th Dec 1928 | Box 61a \ 1 scan0425 | |
| Instructions regarding the instrument panel, accessories, and headlamps for a 19-EX Hooper Sedanca. | 18th Dec 1928 | Box 61a \ 1 scan0426 | |
| Letter regarding a shipment of headlamps on the vessel 'Celtic' which ran aground, and the ordering of a replacement set. | 22th Dec 1928 | Box 61a \ 1 scan0427 | |
| The failure and subsequent repair of a Lucas P.100 headlamp on an 18-EX vehicle. | 4th Jan 1929 | Box 61a \ 2 scan0001 | |
| Unsatisfactory Lucas electrical headlamp dippers on car 18-EX in France. | 4th Jan 1929 | Box 61a \ 2 scan0002 | |
| Readiness and dispatch of special P-100 headlights with bi-focal bulbs for an experimental enclosed limousine. | 4th Jan 1929 | Box 61a \ 2 scan0003 | |
| Telegram from Lucas confirming P100 headlamps with double filament bulbs are ready for delivery. | 4th Jun 1934 | Box 61a \ 2 scan0004 | |
| Letter from Joseph Lucas Limited regarding the supply and modification of P.100 Projectors for testing. | 4th Jan 1929 | Box 61a \ 2 scan0005 | |
| Letter from Joseph Lucas Ltd. regarding a wiring diagram for lamps. | 4th Jan 1929 | Box 61a \ 2 scan0006 | |
| Letter to Lucas Electric Co. providing feedback on various lamps and suggesting the production of a new unit. | 19th Jan 1929 | Box 61a \ 2 scan0007 | |
| Mr. Minchin's feedback on his 20 HP car, including suggestions for modifications. | 21th Jan 1929 | Box 61a \ 2 scan0008 | |
| Headlight options and body mounting for cars 21-EX and 22-EX. | 22th Jan 1929 | Box 61a \ 2 scan0009 | |
| Request for P.100 double-filament headlamps and Bosch foot switches for 21-EX and 22-EX cars. | 23th Jan 1929 | Box 61a \ 2 scan0010 | |
| Instructions for supplying P-100 headlights and Bosch two-way switches for cars 21-EX and 22-EX. | 24th Jan 1929 | Box 61a \ 2 scan0011 | |
| Communication regarding a supply delay for Bosch two-way switches. | 28th Jan 1929 | Box 61a \ 2 scan0012 | |
| Performance of different headlamp dipping schemes after testing. | 28th Jan 1929 | Box 61a \ 2 scan0013 | |
| To Mr. Honeyman confirming the requirement for and requesting an order of Lucas P.100 bifocal headlamps for car 23-EX. | 5th Feb 1929 | Box 61a \ 2 scan0014 | |
| The dispatch of Lucas headlights and a Bosch switch for Open Car No. 23-EX. | 6th Feb 1929 | Box 61a \ 2 scan0015 | |
| Reprint from 'The Motor' magazine describing a foot-operated two-way switch for Marchal headlamps. | 5th Jun 1928 | Box 61a \ 2 scan0016 | |
| Magazine reprint article describing the new Marchal Trilux Head-lamp. | 6th Sep 1927 | Box 61a \ 2 scan0017 | |
| Product leaflet showing Marchal headlamps, accessories, and a windscreen glass-cutting tool. | 1st Jan 1928 | Box 61a \ 2 scan0018 | |
| Catalogue page for various special supports to adapt Marchal headlamps and a Marchal stop and direction indicator. | 1st Jan 1928 | Box 61a \ 2 scan0019 | |
| Promotional brochure for Marchal anti-dazzle car lamps. | 18th Dec 1928 | Box 61a \ 2 scan0020 | |
| Product brochure for Marchal spotlights, headlamps, and various automotive electrical components. | 18th Dec 1928 | Box 61a \ 2 scan0021 | |
| Promotional brochure for Superphare Marchal 'Trilux' anti-dazzle headlamps, detailing features, models, and pricing. | 18th Dec 1928 | Box 61a \ 2 scan0022 | |
| Brochure detailing Marchal 'Trilux' and 'De Luxe' headlamps with specifications and prices. | 4th Feb 1929 | Box 61a \ 2 scan0023 | |
| Letter from Joseph Lucas Ltd confirming the dispatch of P.100 lamps with double filament bulbs. | 4th Feb 1929 | Box 61a \ 2 scan0024 | |
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