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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).
Unfused electrical connection for an indicating lamp in framed instruments.

Identifier  ExFiles\Box 15\7\  Scan024
Date  16th November 1926
  
X 2530

To Da.{Bernard Day - Chassis Design} from EFC.

EFCS/T16.11.26.

FRAMED INSTRUMENTS WITH INTERIOR ILLUMINATION
N.Scheme 2224.

On the above Scheme the connection to the
indicating lamp, via the Cambridge thermometer, is shewn
taken from one of the ammeter terminals. We presume
you are aware that in so doing there is no fuse provided
for this circuit, except the main battery fuse.

Strictly speaking of course, such a circuit
should come from terminal No.7 on the distribution board
which is fed through a fuse, though that would be particularly
inconvenient in this case. For the experimental tests
it is being arranged as shewn on N.Sch.2224, and though it
is perhaps unlikely that it would be any source of trouble,
you will agree that it is really wrong in principle.

One has to remember that the instrument cases are all earthed.

EFC.
  
  


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