| Description | Date | Identifier | |
| Comparing the appearance of a Mercedes Benz to the 18-EX model. | 1st Feb 1929 | Box 166 \ 4 img035 | |
| Proposed method for mounting the rear number plate and tail lamp. | 1st Feb 1929 | Box 166 \ 4 img036 | |
| The supply, return, and finishing of various lamps and a horn for a specific vehicle build. | 21th Mar 1929 | Box 166 \ 4 img037 | |
| Clarifying confusion over lamps and accessories for experimental cars by listing previous reference memos. | 29th Apr 1929 | Box 166 \ 4 img038 | |
| Delay in making the instrument board for a Barker Close Coupled Allweather due to a lack of instruments. | 29th Apr 1929 | Box 166 \ 4 img039 | |
| Surplus lamps, instrument panels, dials, and radiator shutter controls for specific car models. | 8th May 1929 | Box 166 \ 4 img040 | |
| Providing recommendations for standard lamp bulbs and their specifications. | 1st Jan 1930 | Box 166 \ 4 img041 | |
| Recommendations for side lamp bulb wattage and analysis of the electrical system's total ampere load. | 1st Jan 1930 | Box 166 \ 4 img042 | |
| List of recommended standard lamp bulbs for various vehicle applications. | 8th Jan 1930 | Box 166 \ 4 img043 | |
| Provisional standard specification for Tungsten Filament Electric Lamps for automobiles. | 1st Aug 1929 | Box 166 \ 4 img044 | |
| Specification sheet for BAS Type Tungsten Filament Electric Lamps with dimensional drawings. | 1st Aug 1929 | Box 166 \ 4 img045 | |
| Data sheet specifying ratings and characteristics for tungsten filament electric lamps. | 1st Aug 1929 | Box 166 \ 4 img046 | |
| Specifications and dimensions for a small bayonet cap tungsten filament electric lamp. | 1st Aug 1929 | Box 166 \ 4 img047 | |
| Provisional standard for Type Tungsten Filament Electric Lamps (Gasfilled and Vacuum), including dimensions for a small bayonet cap holder. | 1st Aug 1929 | Box 166 \ 4 img048 | |
| Revised wingstays, crossmember, and lamp brackets for the 20/25 HP model. | 24th Apr 1930 | Box 166 \ 4 img049 | |
| The design and testing of a centre lamp bracket for the 20/25HP model. | 30th Apr 1930 | Box 166 \ 4 img050 | |
| List of recommended standard lamp bulbs for vehicles. | 2nd May 1930 | Box 166 \ 4 img051 | |
| Secret memorandum on revised wing stays, cross members, lamp brackets, and wiring for the 20/25 HP chassis. | 3rd May 1930 | Box 166 \ 4 img052 | |
| Design and supply of stop lamp brackets for various car models. | 5th May 1930 | Box 166 \ 4 img053 | |
| Request to order specific lamp bulbs from G.E.Co. for P.100 head lamps and side/tail lamps. | 7th Jun 1930 | Box 166 \ 4 img054 | |
| Letter concerning the approval of a Phantom II type head-lamp bracket fitted to a 20/25 HP chassis. | 23th Jun 1930 | Box 166 \ 4 img055 | |
| Examination of a car, noting that the Head Lamp Brackets are considered too small and overwhelming for the 20-HP model. | 24th Jun 1930 | Box 166 \ 4 img056 | |
| Query regarding the release of chassis 14-G4 from experimental work to the Repair Department. | 25th Jun 1930 | Box 166 \ 4 img057 | |
| Request to obtain lamp bulbs from G.E.Co. for inspection lamps. | 26th Jun 1930 | Box 166 \ 4 img058 | |
| Extract from a report on tests of completed cars, highlighting unsatisfactory wing stays and headlamps on the 25 HP model. | 26th Jun 1930 | Box 166 \ 4 img059 | |
| Modifications to the headlamp brackets and wing stays for the 20/25 HP model. | 26th Jun 1930 | Box 166 \ 4 img060 | |
| New headlamp brackets for the 20/25 HP chassis, requesting a sample pair for approval. | 3rd Jul 1930 | Box 166 \ 4 img061 | |
| Extract from a report on tests of completed cars, regarding new headlamp brackets for the 'S' series chassis. | 5th Jul 1930 | Box 166 \ 4 img062 | |
| The inspection and standardisation of headlamp brackets for chassis 14-G4. | 8th Jul 1930 | Box 166 \ 4 img063 | |
| Internal request to order twelve specific lamp bulbs for side and tail lamps. | 9th Jul 1930 | Box 166 \ 4 img064 | |
| Supply of various lamps, switches and a wiper for a 20/25 HP Enclosed Limousine. | 15th Jul 1930 | Box 166 \ 4 img065 | |
| Delay in the supply of lamps and wipers from Lucas for Experimental Car No.18-G4. | 18th Jul 1930 | Box 166 \ 4 img066 | |
| Non-receipt of lamps from Lucas for car 18-G4 and discussing other received parts. | 19th Jul 1930 | Box 166 \ 4 img067 | |
| Copy of a memo concerning the dispatch and tracking of lamps and switches for chassis 18-G4. | 21th Jul 1930 | Box 166 \ 4 img068 | |
| Internal order request for specific lamp bulbs for an instrument lamp and thermometer. | 4th Aug 1930 | Box 166 \ 4 img069 | |
| On fitting smaller diameter Phantom II type headlamp brackets to a 20/25 HP car. | 18th Mar 1930 | Box 166 \ 4 img070 | |
| The lamp bulb specifications for car 24-EX and reporting a subsequent dynamo failure. | 19th Aug 1930 | Box 166 \ 4 img072 | |
| Internal memorandum requesting an order for specific lamp bulbs. | 29th Aug 1930 | Box 166 \ 4 img073 | |
| Standardisation of headlamp mounting and the use of existing 20/25 HP wing stays. | 11th Sep 1930 | Box 166 \ 4 img074 | |
| Request to obtain Osram lamp bulbs for side and tail lamps. | 22th Sep 1930 | Box 166 \ 4 img075 | |
| New Marchel headlamp, requesting it be tested and comparing it to Lucas bulbs. | 26th Sep 1930 | Box 166 \ 4 img076 | |
| Standardisation of chassis parts, specifically headlamps, stronger wing stays, and lamp brackets to address a 'jellying' issue. | 30th Jun 1930 | Box 166 \ 4 img077 | |
| Effectiveness of Lucas vs. French Marchel headlamps and a new French law. | 2nd Oct 1930 | Box 166 \ 4 img078 | |
| Internal memorandum requesting the purchase of various light bulbs for the Experimental Department. | 27th Oct 1930 | Box 166 \ 4 img079 | |
| Internal request to order specific Osram bulbs. | 1st Dec 1930 | Box 166 \ 4 img080 | |
| Letter of complaint to General Electric Co. Ltd. regarding faulty 12 volt lamp bulbs. | 31th Dec 1930 | Box 166 \ 4 img081 | |
| Extract from a 10,000-mile report on vehicle 18-GIV, detailing a headlamp wiring fault. | 30th Jan 1931 | Box 166 \ 4 img082 | |
| Letter from The General Electric Co. Ltd. responding to a complaint about the voltage of supplied lamps. | 1st Jan 1931 | Box 166 \ 4 img084 | |
| Issue with 12-volt lamp bulbs and a proposal for their replacement with 14-volt versions. | 3rd Jan 1931 | Box 166 \ 4 img085 | |
| EFC to Roy requesting an order for Osram lamp bulbs. | 6th Jan 1931 | Box 166 \ 4 img086 | |
| Differences between 48 and 60 watt bulbs in relation to the dynamo's output and battery charging. | 7th Jan 1931 | Box 166 \ 4 img087 | |
| Suggesting a change in headlamp bulb wattage from 60W to 48W to manage dynamo output and reduce battery discharge. | 1st Sep 1931 | Box 166 \ 4 img088 | |
| Confirming S.7214 bulbs are a satisfactory replacement for returned S.7168 bulbs, and requesting a list of Osram lamps from G.E.Co. | 3rd Jan 1931 | Box 166 \ 4 img089 | |
| The testing of inspection lamp bulbs and a suggestion for a suitable replacement. | 17th Jan 1941 | Box 166 \ 4 img090 | |
| Standardization and recommended list of chassis lamp bulbs for Phantom II and 20/25 models. | 9th Jan 1931 | Box 166 \ 4 img091 | |
| List of recommended lamp bulbs for the Phantom II chassis. | 20th Feb 1931 | Box 166 \ 4 img092 | |
| List of recommended lamp bulbs for the 20/25 chassis. | 20th Feb 1931 | Box 166 \ 4 img093 | |
| Specification and production status of a medium output dynamo for the 58-GN model. | 20th Jan 1931 | Box 166 \ 4 img094 | |
| Request to obtain three dozen Osram lamp bulbs following a recommendation to change wattage. | 20th Jan 1931 | Box 166 \ 4 img095 | |
| Output of a modified dynamo and the standardisation of 48-watt headlamp bulbs. | 21th Jan 1931 | Box 166 \ 4 img096 | |
| Letter to The General Electric Co. Ltd. regarding issues with under-performing double contact inspection lamp bulbs for experimental cars. | 22th Jan 1931 | Box 166 \ 4 img097 | |
| Page 2 of a letter to General Electric Co. Ltd. concerning lamp wattage. | 22th Jan 1931 | Box 166 \ 4 img098 | |
| Letter from The General Electric Co Ltd regarding a sample 12-volt, 9-watt S.B.C Vacuum Side Lamp and pricing. | 23th Jan 1931 | Box 166 \ 4 img099 | |
| Estimation of lamp load on the L.H. chassis electrical system compared to the P.2. chassis. | 31th Jan 1931 | Box 166 \ 4 img100 | |
| Note on how candle power varies for metal and carbon filament lamp bulbs based on terminal P.D. | 2nd Feb 1931 | Box 166 \ 4 img101 | |
| Request to order a small batch of Osram inspection lamp bulbs for further testing. | 5th Feb 1931 | Box 166 \ 4 img102 | |
| Order for six Osram inspection lamp bulbs for further approval. | 6th Feb 1931 | Box 166 \ 4 img103 | |
| Note confirming the fitting of 48-watt headlamp bulbs to car CLN60 for a trial. | 15th Feb 1931 | Box 166 \ 4 img104 | |
| Letter regarding lamp bulb lists for Phantom II and 20/25 chassis and standards for the U.S.A. market. | 21th Feb 1931 | Box 166 \ 4 img105 | |
| Specification sheet for light bulb dimensions and filaments according to B.E.S.A. standards. | 16th Mar 1931 | Box 166 \ 4 img106 | |
| Letter from the American branch discussing lamp bulb specifications and headlamp technology. | 16th Mar 1931 | Box 166 \ 4 img107 | |
| List of specifications for various vehicle lamp bulbs and a discussion on instrument board lamp voltage. | 4th Apr 1931 | Box 166 \ 4 img108 | |
| Internal request to order various types of Osram lamp bulbs. | 4th Apr 1931 | Box 166 \ 4 img109 | |
| Return of incorrect gasfilled lamp bulbs and request for the correct vacuum type. | 20th Apr 1931 | Box 166 \ 4 img110 | |
| Modifications to headlamp brackets and the potential use of a front apron for the 20/25 HP+ 2nd half 'T' Series. | 20th May 1931 | Box 166 \ 4 img111 | |
| Internal request to order three different types of Osram lamp bulbs. | 29th Jun 1931 | Box 166 \ 4 img112 | |
| Order for Osram headlamp bulbs to comply with new lighting regulations. | 6th Jul 1931 | Box 166 \ 4 img113 | |
| Letter to The General Electric Co. Ltd. regarding failures of Osram automobile lamps due to filament breakage. | 30th Oct 1931 | Box 166 \ 4 img114 | |
| Failed Osram automobile lamp being sent for examination. | 30th Oct 1931 | Box 166 \ 4 img115 | |
| Letter from General Electric Co Ltd concerning the failure and replacement of a 12 Volt 48 Watt bulb. | 5th Nov 1931 | Box 166 \ 4 img116 | |
| Introduction of R.170 S.E.D. Lucas headlamps for the 20/25 HP model. | 13th Nov 1931 | Box 166 \ 4 img117 | |
| Letter from General Electric Co. Ltd. regarding the resolution of a fault with 12 Volt 48 Watt headlamp bulbs. | 16th Nov 1931 | Box 166 \ 4 img118 | |
| Request to obtain Osram automobile lamp bulbs from the General Electric Co. | 8th Nov 1931 | Box 166 \ 4 img119 | |
| Works order for the despatch of two 36-watt headlamp bulbs by letter post. | 20th Nov 1931 | Box 166 \ 4 img120 | |
| Instruction to Despatch Stores to send two 36 watt headlamp bulbs to G.W. Hancock in France at no charge. | 20th Nov 1931 | Box 166 \ 4 img121 | |
| Acknowledging the safe arrival of a Stephan-Grebel bulb. | 26th Nov 1931 | Box 166 \ 4 img122 | |
| Modifications and costs related to headlamps and brackets for the 20/25 chassis series. | 28th Nov 1931 | Box 166 \ 4 img123 | |
| Proposal to use taller headlamp brackets for P.30 lamps on the 40/50 model. | 28th Nov 1931 | Box 166 \ 4 img124 | |
| Arrangement of taller headlamp brackets for the 20/25 HP model. | 2nd Dec 1931 | Box 166 \ 4 img125 | |
| The fitting of new Lucas headlamps to the 20/25 HP model. | 12th Dec 1931 | Box 166 \ 4 img126 | |
| Confirming that new headlamp brackets for the 20/25 HP chassis can be brought into production. | 14th Dec 1931 | Box 166 \ 4 img127 | |
| Order request for various types of Osram chassis lamp bulbs. | 1st Jan 1932 | Box 166 \ 4 img128 | |
| Internal order request for two types of lamp bulbs. | 8th Feb 1932 | Box 166 \ 4 img129 | |
| Request to order various Osram brand chassis electric lamp bulbs. | 4th Apr 1932 | Box 166 \ 4 img130 | |
| Cover memo forwarding a self-explanatory document regarding side lamp bulbs for comments. | 11th Apr 1932 | Box 166 \ 4 img131 | |
| Issues with side lamp bulbs blowing on trial cars due to over-voltage. | 7th Apr 1932 | Box 166 \ 4 img132 | |
| Over-voltage issues causing side lamp bulb filaments to burn out on trials cars. | 2nd Apr 1932 | Box 166 \ 4 img133 | |
| Issue of side lamp bulbs burning out on trials cars due to high voltage. | 15th Apr 1932 | Box 166 \ 4 img134 | |
| Voltage for side lamp bulbs and recommending fitting 14 to 16 volt lamps. | 21th Apr 1932 | Box 166 \ 4 img135 | |
| Internal order request for various Osram automobile lamp bulbs. | 30th Apr 1932 | Box 166 \ 4 img136 | |
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