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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).
From EFC to Rs. requesting clarification on the specifications and origin of half watt lamps.

Identifier  ExFiles\Box 38\3\  Scan265
Date  14th June 1920
  
To Rs.{Sir Henry Royce's Secretary} from EFC.
x3362
COPY.
EFC2/T14.6.20.

X.1114 - HALF WATT LAMPS. X3362

Referring to your note Rs{Sir Henry Royce's Secretary}2/G27.4.20, could you kindly let us know if you have received the two 12/14 volt half watt type lamps which were sent under separate cover at the time of our note EFC3/T23.4.20.
Further, with reference to yours R9/G8.6.20, would you kindly let us know if the lamps referred to therein are some obtained by you direct from the B.T.H. Co., or if the note refers to some which have been received from Derby. We want to keep clear in our mind the results of the use of lamps made actually and nominally for 12 volts with those which we have had specially made for a nominal 12 volts but an actual 14.

EFC.
  
  


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