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).
Brief on the reliability and enhanced life of a two 12-volt lamp scheme for lighting instruments.
| Identifier | ExFiles\Box 168a\1\ img111 | |
| Date | 31th August 1938 | |
| c. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} 6123- BY.1/G.31.8.38. LAMPS FOR LIGHTING INSTRUMENTS. The evidence of the experiment work is in favour of the two 12 volt lamp scheme on the basis of very much enhanced life. Lamps which fuse at intervals are a strong and justifiable cause of irritation, they are seldom replaced after one or two failures occur. I think external lighting such as you are working on gives reliability. BY.{R.W. Bailey - Chief Engineer} | ||