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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).
Design improvements and issues for petrol fillers and petrol gauges.

Identifier  ExFiles\Box 135\2\  scan0077
Date  15th February 1926
  
To DA.{Bernard Day - Chassis Design} from R.{Sir Henry Royce}
c. to CJ. BJ.
c. to BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair}
c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer}

R1/M15.2.26.

PETROL FILLERS - PETROL GAUGE. X.3701
X.8460 X.8190

I think N.sch.2100 might be better, thus :-

(1) Spring disc fitting unnecessarily complicated.

SKETCH.

(2) Do not split disc but make it thinner if desired more flexible. The split as shewn is difficult, and forms local weakness.
(3) Threaded ring unnecessarily heavy, and fifficult to get together (see sketch).

By bending pipe upwards the double tube can be shorter. By making connection as sketch air restriction can be avoided, and the two tubes can be close together.

SKETCH.

Make the workmanship easy and practical, save every fraction of weight, make it as simple as possible, with efficiency. I do not think N.sch.2100 is so.

I noticed on 7-EX. which is here that the petrol gauge goes anti-clockwise. I have corrected this previously and got it right on the last G HP., now it is wrong again for no reason.

I am very pleased with this tank filter, and the instrument grouping. Something should be done to make it standard, after rendering it perfect and practical. I do not know if it is so.

R.{Sir Henry Royce}
  
  


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