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).
Test report logging the operational lives and failure times of various components like levers, shafts, and casings.
| Identifier | ExFiles\Box 16\7\ Scan136 | |
| Date | 1st January 1929 guessed | |
| contd :- -2- INSIDE LEVERS. Several of these broke - their lives were :- With 8 restrictions : N.S. F.79313. O.S. F.79314. 6 hrs. 30 mins. 6 hrs. 30 mins. 1 hr. 15 mins. 1 hr. 15 mins. With 5 restriction washers. 9 hrs. 15 mins. 9 hrs. 0 mins. I. section inside levers were fitted and ran remaining 21 hrs. 30 mins. with 5 restriction washers without failing. MAIN SHAFT. When stronger inside levers were fitted, these broke after :- N.S. F.79311. O.S. F.79312. 8 hrs. 45 mins. 14 hrs. 15 mins. CASINGS. The original aluminium casings (having run with 8 restrictions) broke after :- N.S. O.S. 22 hrs. 10 mins. 22 hrs. 25 mins. Aluminium bronze casings were fitted after 70 hrs. 15 mins. and ran with 5 restrictions for 41 hrs. 30 mins. longer, surviving many other broken parts. (Still unbroken) OUTSIDE LEVERS. F.79317 - broke after running 64 hrs. 10 mins.(N.S.) failed after 100 hrs. were completed. A second one broke after running 66hrs. 10 mins. (O.S.) contd :- | ||