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).
Testing half-watt, 4-amp bulbs for use with C.A.V. lamps.
| Identifier | ExFiles\Box 61a\1\ scan0026 | |
| Date | 16th December 1914 guessed | |
| -2- 'seen from the above figures. I will try them for efficiency and report later. X.1114 We have also some half watt 4 amp. bulbs for use with the C.A.V. lamps and these will be tried with the various types of lamp. They give a pure white light of great intensity, the filament being very condensed and short. | ||