From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
List of specifications for various vehicle lamp bulbs and a discussion on instrument board lamp voltage.
| Identifier | ExFiles\Box 166\4\ img108 | |
| Date | 4th April 1931 guessed | |
| - 2 - 3. Instrument Board Lamp. I notice you specify a 16-18 volt 3 watt lamp. I don't know whether this extra voltage lamp is available over here. For replacements we would propose to use a 12-16 double contact, 3 candlepower bulb, and the same for the Thermometer lamp when fitted. Our list of lamp bulbs would thus boil down to: 1. Headlamps - 12-16 v.{VIENNA} - 21-32 double filament, gas filled bulb, Westinghouse Mazda # . Our No. M-1733. 2. Sidelamps - 12-16 v.{VIENNA} - 3 c.p. single contact base, Westinghouse Mazda #67. Our No. A-12588. 3. Rear lamps- Tail Light - 12-16 v.{VIENNA} - 3 c.p. - single contact base, Westinghouse #67. Our No. A-12588. Stop Light - 12-16 v.{VIENNA} - 21 c.p. - single contact base, Westinghouse #1141. Our No. M-1088. Backing Light - 12-16 v.{VIENNA} - 21 c.p. - single contact base, Westinghouse #1141. Our No. M-1088. 4. Instrument and Thermometer. - 12-16 v.{VIENNA} - 3 c.p. double contact base, Westinghouse Mazda #68. Our No. M-1084. Yours very truly, [Signature of Robt. B. Burton] Robert B. Burton Chief Engineer - Chassis Div. RBB/VB | ||