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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).
Letter from consulting engineer G. J. Gibbs concerning the design and operation of patented air meters.

Identifier  ExFiles\Box 38\1\  Scan022
Date  19th November 1918
  
X 3404.

G.{Mr Griffiths - Chief Accountant / Mr Gnapp} J.{Mr Johnson W.M.} GIBBS,
M.{Mr Moon / Mr Moore} I. MECH. E.{Mr Elliott - Chief Engineer}, A.M.I.E.E.
-A.C.G.I.-
CONSULTING ENGINEER.

TELEPHONE 114.

7, LUNE STREET,
PRESTON.

Nov. 19th 1918

Dear Clough,

I got home by last train last night and have found your letter here this morning.
I enclose two illustrations of my air meters which only differ in the arrangement of the orifices.
The larger one is similar to that- supplied to Bamber Bridge.
These meters are made to my design and under my patent at York: The price of the Bamber Bridge meter was £18 โ€“ this was of course pre-war.
The principle of the meter is in the use of a small variable orifice and a constant head under which the air flows into the orifice.
You will perhaps remember the method of using the instrument โ€“ start with orifice wide open and gradually close down until the working head as indicated on the joint manometer is arrived at. This with the pictures & your memory may furnish all you want for the present.
With kind rgds
Yours sincerely Geo. Gibbs

I can arrange to pass through Derby about the end of this month? G.{Mr Griffiths - Chief Accountant / Mr Gnapp}
  
  


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