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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).
Requesting samples of Bi-focal headlamp bulbs, including a sketch with socket dimensions.

Identifier  ExFiles\Box 61a\1\  scan0356
Date  17th October 1928
  
To OY. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
X4477
Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}10/LG17.10.28.
BIFOCAL LAMP BULBS. [struck-through: X1369]
We are anxious to obtain as soon as we can
some headlamp bulbs of the Bi-focal type.
The dimension of our standard socket
is as shewn. We would use double
pole holders, both poles as high
potential, [struck-through] leads. Can you
get hold of some samples for us
please.
Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
.595"
.200"
  
  


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