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).
The failure of a 12/14 volt Mazda lamp used for office lighting.
| Identifier | ExFiles\Box 38\3\ Scan267 | |
| Date | 4th August 1920 | |
| E.R. 253a. (100 T) (S.G. 643. 19-2-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2615 x3362 COPY E7/G4.8.20. To EFC. from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " Bn.{W.O. Bentley / Mr Barrington} " " Hs.{Lord Ernest Hives - Chair} RE HALF WATT LAMPS. x3362 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. J804. E.{Mr Elliott - Chief Engineer} MADE AT CHORLEY | ||