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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 issues with the auxiliary magneto switch, proposing its removal from the ignition system.

Identifier  ExFiles\Box 163\6\  img009
Date  8th January 1930
  
-3- EFC1/AD'S.8.1.30. contd.

ignition switch only with B, M & B and M positions.

One slight disadvantage in this would be the loss
of the extended armature contact, but an advantage would be
the elimination of the auxiliary magneto switch.

We do not like the auxiliary magneto switch, and
think it should be deleted from the system. It has been
somewhat of a nuisance because the knob of the switch has
not been insulated from its connecting bridge piece and
shocks have been received. By suitable arrangements we
have eliminated the possibility of shock except in the one
case when the auxiliary magneto switch is 'off' though the
magneto be 'on' in the M & C position of the switchbox
switch. Even this possibility is objected to and we have
asked the D.O. to insulate the switch knob and metal casing
of this auxiliary switch from its bridge piece. I have
known cases (on cars of another make) of a magneto being
de-magnetised and rendered temporarily useless by an
accidental connection on the positive of the battery to metal
in connection with the low tension terminal of the magneto.
That is an additional reason for insulating the casing
of the switch.

We think the auxiliary magneto switch is an item,
the function of which either could be and should be
included in the main switch, or be rendered unnecessary by
otherwise suitably modifying the system.




EFC:
  
  


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