12/14 volt Mazda lamp that broke down during testing.
| Identifier | ExFiles\Box 180\M1\3\ img021 | |
| Date | 6th August 1920 | |
| To EFC. {E. Fowler Clarke - Electrical Engineer} from E. {Mr Elliott - Chief Engineer} Copy to CG. ~~Copy to BN. {W.O. Bentley / Mr Barrington} ~~ ~~Copy to HS. {Lord Ernest Hives - Chair} ~~ WW LIGHTING SET ORIGINAL. 4 E7/G4/8/20. 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} [Signature] [Stamp: RECEIVED 6 AUG 1920] R R 2307 4000. 1/19 M.D. FOR DRG. & LIBY. DEPT. | ||
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).