Failure of a 12/14 volt Mazda half-watt lamp during a test period.
| Identifier | Morton\M1.3\ img021 | |
| Date | 6th August 1920 | |
| To EFC. {E. Fowler Clarke - Electrical Engineer} from E. {Mr Elliott - Chief Engineer} Copy to CJ. " " BN. {W.O. Bentley / Mr Barrington} " " HS. {Lord Ernest Hives - Chair} WW LIGHTING SET ORIGINAL. E7/G4/8/20. 4 RE HALF WATT LAMPS - X.1114. With further reference to Rs {Sir Henry Royce's Secretary} 8/G23/6/20 the remaining 12/14 volt Mazda lamp sent here for test has broken down. It has been on office lighting from April 26th to July 26th, but has not done more than half a dozen hours of duty during this period. When the lamp failed it grew dim, and the filament appeared to be fusing and giving off a quantity of vapour, which process took about one second. We are sending the lamp to you under separate cover. E. {Mr Elliott - Chief Engineer} [Stamp] D 6 AUG 1920 RECEIVED | ||
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).