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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).
The suitability of Ediswan bulbs and the practicalities of fitting large C.A.V. or Lucas headlamps.

Identifier  ExFiles\Box 61a\1\  scan0023
Date  1st December 1914
  
COPY
-9/12/14

To Wor.{Arthur Wormald - General Works Manager} for Hy{Tom Haldenby - Plant Engineer} from R.{Sir Henry Royce}
Copy to J.{Mr Johnson W.M.}

R11/IB11214.

1st December 1914.

Re Head Lamps. - Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}6/L231114.

L 130/

With reference to head lamps, I quite agree that there is every reason to believe that the Ediswan spiral filament is an excellent bulb for the purpose of a head lamp.

With reference to the lamps themselves, you will remember that the very large size lamps were considered a source of danger owing to their preventing sufficient clearance for the starting handle, and covering up the radiator to some extent. I am, therefore, a little bit anxious to know whether the C.A.V. large model "F" lamp is a practical one to fit to the front of our car. My own impression is that given the same percentage of accuracy and quality in the reflector, I cannot see very much benefit from having a larger lamp, and if there is any difficulty or materially increased expense in fitting the large model "F", I should be glad if you will let us know if there are any other lanterns that will give equally good results in a smaller size.

We are particularly interested in the Lucas lantern, and we should be glad to know if the Lucas lamps on chassis 58NA{Mr Nadin} are as large as the C.A.V. large model "F" lamp. It is
  
  


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