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).
Continued memorandum on lamp performance, lighting power, and the weight of electrical accessories.
| Identifier | ExFiles\Box 61\2\ scan0091 | |
| Date | 11th November 1918 | |
| R12/G11.11.18. Contd. X.1369 (7). The first lamp we tried of those you sent, failed by blackening in 7 1/2 hours, the next one is showing no deterioration after 32 hours. X1114 (8). Re (4) can one rely on 1/2 watt lamp for cars which require much more powerful lighting? (9). Keep down weight of accessories, such as dynamo, batteries, starting motor, and this is your responsibility. R.{Sir Henry Royce} | ||