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. | ||