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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).
Potentiometer method for measuring the amount of sodium in engine valves.

Identifier  ExFiles\Box 174\2\  img064
Date  27th March 1937 guessed
  
-2-

Wilcox-Rich have been supplying valves made with KE-965 heads electrically butt welded to SSLV stems for 3 years and are turning out considerable quantities. They also measure the amount of sodium in a valve approximately by a potentiometer method, thus :-

[DIAGRAM TEXT]
ABOUT 30 AMPS
POTENTIOMETER SET TO READ ZERO WITH A KNOWN EMPTY VALVE WHEN THE CONTACTS ARE SLID DOWN TO THE POSITION SHOWN DOTTED THE GALVANOMETER NEEDLE KICKS SHOWING THE HEIGHT OF SODIUM IN THE STEM. IT WORKED VERY WELL.
[END DIAGRAM TEXT]

A further enquiry about eliminating tracing by C.B. prints shows that the processes are not altogether fool-proof. I propose calling at their head office in New York later, however.

I find I keep changing my proposed route so often that I have arranged to keep Mr. Inskip informed of my addresses. I propose to sail on the 21st April, spending the preceding 10 days or so around New York and staying at the Pennsylvania Hotel.

H.S. Royce.
  
  


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