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).
Lamp testing failures, the suitability of half-watt lamps, and the responsibility for reducing accessory weight.
| Identifier | ExFiles\Box 183\M22\ img024 | |
| Date | 11th November 1918 | |
| To EFC. from R.{Sir Henry Royce} -2- R12/G111118 Contd. X.3362 (7) The first lamp we tried of those you sent, failed by blackening in 7 1/2 hours, the next one is shewing no deterioration after 32 hours. (8) Re (4) can one rely on 1/2 watt lamp for cars which require much powerful lighting? (9) Keep down weight of accessories, such as dynamo, batteries, starting motor, and this is your responsibility. R.{Sir Henry Royce} | ||