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).
Inquiring about the use of 16/18 volt, 3 watt lamp bulbs for thermometer indicating lamps on production.
| Identifier | ExFiles\Box 175\4\ img106 | |
| Date | 13th December 1928 | |
| To EY/RD. from EFC. X3875 EFC4/T3.12.28. Are we yet using 16/18 volt 3 watt .2 amp. lamp bulbs type S.7954 with Edison Screw Caps (G.E.C.) on production, for use as thermometer indicating lamps ? We consider you should obtain these for production. e.p.m. EFC. | ||