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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 specifications and sketches for a filler cap, handle, and strainer assembly.

Identifier  ExFiles\Box 42\4\  Scan095
Date  5th August 1920
  
R.R. 235a (100 T) (S.G. 643. 19-3-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2018
Contd.
-2-
E3/G5.8.20.

(2) The handle for operating the filler cap should be made about 1" higher relative to the cone shaped cover, with the object of allowing the hand to firmly catch hold of it without the fingers being fouled by the cover. This handle should be of the star form in which the hub is relatively small compared with the fingers of the star see sketch below -

(3) Mr. Royce would prefer the cone shaped cap to have four features only for unscrewing, and these features to be thinner and to have more area for carrying the pressure of the fingers.

(4) The strainer and strainer cap should still be of the type shewn on LeC.1199 for the sake of simplicity, but the cap should be tried with a leather washer joint enclosed on both outside and inside diameters - see sketch -

LEATHER WASHER ENCLOSED

If this is not successful in making a petrol tight joint, then Mr. Royce would like a scheme tried in which the strainer is screwed into the socket, and carries a loose coned cap tightened up by a set screw screwing into the strainer - see sketch -

X.3562. Regarding the hand of the filler, Mr. Royce remarks as follows:-

"I quite agree to having this in the correct hand for the English cars, and American cars. This matter will be more straight forward when we adopt the left

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