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, lighting reliability, and the weight of accessories.
| Identifier | Morton\M22\ img024 | |
| Date | 20th November 1918 guessed | |
| To EFC. from R.{Sir Henry Royce} -2- X.3362 R12/G11118 Contd. (7) The first lamp we tried of those you sent, failed by blackening in 7½ hours, the next one is shewing no deterioration after 32 hours. (8) Re (4) can one rely on ½ 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} | ||