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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 merits and fitting procedures of the 'Nivex' petrol gauge.

Identifier  ExFiles\Box 61\3\  scan0053
Date  24th June 1930 guessed
  
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of the petrol in the tank, the joints are likely to wear
out!

The great advantage of the 'Nivex' gauge is
that the pressure element will stand an over-load, and therefore
does not require a pressure balance line. This eliminates
two joints which are potential sources of trouble.

As you see from the model production gauge
which we are sending you, it is quite feasible to leave the
gauge head connected up with the pipe line once it has been
tested at Derby and fitted in to the back of the instrument
board on the car. We feel, however, that if the gauge head
is left attached to the pipe line it will almost certainly
be damaged during the fitting of the body and that, actually,
now that the method of connecting up the gauge head is generally
understood, the present procedure of dis-connecting before the
car leaves the Works is likely to be the best.

We agree that if we are to do away with the
high filler cap, the gauge problem becomes easier and if we
can further reduce the scale of the instrument, the necessity
for a balance line becomes less. We are of the opinion, however
that though there may have been as many as 10% of the gauges
fitted to cars that have given trouble in the past, the type of
gauge which we have run on the last 10,000 miles car will over-
come at least 90% of these complaints, and is in fact, better
than anything else we know of at present.

We have discussed the whole gauge problem with
Oy. and he is satisfied that we have now got something which
  
  


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