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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).
On testing a turn warning apparatus, detailing issues with the steering mechanism and a metal switch ring.

Identifier  ExFiles\Box 43\3\  Scan010
Date  2nd October 1929
  
X3986

To Ev.{Ivan Evernden - coachwork} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}

Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}4/AD2.10.29.

We have tested out the warning apparatus
snowing right and left turns etc.

One difficulty with this apparatus is, that
as our steering wheel makes 2 1/2 turns every full lock to
full lock, a large festoon of flex is necessary to connect
the stationary part of the column to the rotating part.
A metal finger is necessary to make a reasonable contact here.

A further decision is :-

"The switch ring fitted to the steering wheel
is slightly too large in diameter, fouls the knuckles of
the hands when cornering etc. It gives a cramped impression
of the steering wheel.

The ring being of metal causes the fuse to be
blown if any metal shorts between the spokes and the ring."

This apparatus is now fitted to 21-EX car,
which is being run by Sales as a trials car in London.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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