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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).
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. 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
  
  


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