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).
Comparative material tests on wear resistance and co-efficient of friction for lining materials.
| Identifier | ExFiles\Box 141\3\ scan0014 | |
| Date | 30th July 1930 guessed | |
| 2. Continued. "A more recent test was carried out on the 3rd April 1930 at the National Physical Laboratories, and the conclusions then arrived at were as follows:- "This material was very resistant to wear. The co-efficient of friction increased very greatly as wear proceeded." "Regarding the co-efficient of friction with considerable fluctuations of temperature, we would quote an extract of a report from the same source dated the 14th November 1929 as follows:- "Conclusions. The resistance to wear is satisfactory and the co-efficient of friction is not subject to sudden changes." "For our own information we submitted to the National Physical Laboratory on the 24th February 1930 samples of perhaps the best known competitive make of Lining along with an identical piece of our own "SAFEGUARD" Lining. Separate reports were made on each test and for the purpose of comparison we give you both verbatim:- "SAFEGUARD" "Conclusions. The material is very resistant to wear. The co-efficient of friction varies some-what but is generally high after the first hour of running." Competitive make. "Conclusions. This material is fairly resistant to wear. The co-efficient of friction falls considerably while wear proceeds. A few small sparks were thrown off occasionally." "With regard to the co-efficient of friction, the "SAFEGUARD" on an average of 6 tests was shown to be 25% higher than the other Lining. "We have detailed records of tests carried out in our own Laboratories but probably you would prefer to have those made independently. "If we can supplement them by any further information we hope you will not hesitate to write us further on the subject." | ||