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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).
Reliability of new half-watt lamps from B.T.H. Co. and their recommendation for use in chassis headlamps.

Identifier  WestWitteringFiles\F\January1921\  Scan42
Date  25th January 1921
  
R.R. 235A (100 T) (S.H. 798, 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2047
Contd.
-5-
EFC1/T25.1.21.

One can say that the half watt lamps we are at
present receiving from the B.T.H. Co. are at least as reliable
as ordinary metallic filament Royal Ediswan, and that
therefore at this point we are justified in recommending their
use for chassis head lamps.
We have received some more of these lamps lately
and some of these have been sent to the Test Dept., Expl. Dept.
and to Mr. Royce for test in service.
The improvement brought about in these lamps has
followed various complaints we have made to the B.T.H. Co.
about the failures of the earlier half watt lamps which we
received from them.

EFC.
  
  


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