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).
Drawing illustrating wear on a wrapping shoe after testing.
| Identifier | ExFiles\Box 30\6\ Scan183 | |
| Date | 15th February 1924 guessed | |
| WEAR ON WRAPPING SHOE AFTER ABSORBING 21 H.P. hrs. AT 300 R.P.M. WORST WEAR HERE. .018" .005" .007" .003" | ||