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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).
Dynamo charging issues and proposed experiments on various chassis components.

Identifier  ExFiles\Box 59\1\  Scan171
Date  10th November 1927 guessed
  
-13-

large resistance would be left on the field circuit and
the dynamo may sometimes not be charging at all, i.e.
not below the cutting in speed which is considerably higher
than normal. The required conditions will thus, we hope,
be attained electrically. We see no particular advantage
in attempting to make this resistance so high that the
dynamo will never cut in and we think also that it would
add further difficulties to the problem.

We are proceeding with bench experiments on the
lines indicated.

In regard to the experiments on the chassis we
propose to make a further trial of

(1) The Mentor thermally operated unit,
arranged as a four terminal device, and to operate
on the water temperature lamp.

(2) The electro-magnetic relay (green lamp unit)
also to operate in conjunction with the water
temperature lamp (just for the experiment at any
rate, and additional green lamp could afterwards
be provided without affecting the experiment,
should there be any question of standardising
this unit).

(3) The auto switch arranged on the lines
referred to.


EFC.
  
  


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