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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).
Electrical requirements for a Rolph Patent Automatic Traffic Warner for Major Dunning.

Identifier  ExFiles\Box 43\3\  Scan004
Date  11th November 1921
  
X3935

W/S.
DH.{D. Henderson - Showroom} from EFC.

RE ROLPH PATENT AUTOMATIC TRAFFIC WARNER
FOR MAJOR DUNNING.

Regarding your DH{D. Henderson - Showroom}7/DP8.11.21, with the exception that this traffic warner would be electrically illuminated on our chassis, it appears to be otherwise an entirely mechanical device.

Therefore it would in no electrical way interfere with the wiring of the car. So far as we can see, the only electrical difference this would make is that this warner would be connected to the wiring provided for the tail lamp and switched on in the usual way by the tail lamp switch.

We return the pamphlet herewith.

EFC.
  
  


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