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).
Selection and electrical requirements for lamps on the 'Goshawk II'.
| Identifier | ExFiles\Box 51\2\ Scan017 | |
| Date | 13th August 1921 | |
| X4338 To PN. {Mr Northey} from R. {Sir Henry Royce} c. to CJ. c. to C. c. to BY. {R.W. Bailey - Chief Engineer} c. to EFC. {E. Fowler Clarke - Electrical Engineer} c. to Mr. Thacker. R9/G13.8.21. X.4090 - RE LAMPS FOR "GOSHAWK II" X.4338. We seem to have got the "Goshawk" lamps now which we require from the Lucas, and these people seem to have the only lamp which thoroughly suits our job. We are arranging for internal wiring and for the head lamps and side lamps both to be carried on the front mudguards. Regarding c.p. of the lamps, we should assume that the head lamp is not larger than the 48-c.p. 1/2 watt gas filled lamp which we are using here for the drawing boards. This in the Osram make lasted very well. The side lamp we presume would be about 6 c.p. i.e. 1/2 amp. It is highly desirable that all lamps should be of the high efficiency type, but we believe that these are not made in the lower c.p. (than 48) suitable for the side and rear lamps. We are allowing for the dynamo to give 8 amperes, so that assuming that the ignition will take 1 1/2 amperes there would be 6 1/2 amperes available for the whole lighting of the car, including the internal body lighting. This should be ample, and leave something over for the starter and Klaxon. Contd. | ||