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).
Investigation into material swelling due to its hygroscopic properties, confirmed by a heating test.
| Identifier | ExFiles\Box 69\1\ scan0353 | |
| Date | 29th June 1920 | |
| RR 238 (150 BKS.) (SH57. 29-6-20.) MP 224356 ROLLS-ROYCE LTD. INSTRUCTIONS. 19 To Order No. Wa{Mr Wallis} 988(2) Customer's No. that the wear has been nil, but it is considered that the material has swollen slightly due to absorption of oil or moisture (it is known that this material is very hygroscopic). To prove this in some degree the rubbing block was warmed in a flame upon which a combination of oil and moisture issued in bubbles from the surface of the material. Lever herewith & after 20,000 mls. Signed H.E.W. This Sheet must be filed on completion of the work. | ||