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).
The condition of S/ZN, cloud burst hardened, and plated tappets after a high-speed test run.
| Identifier | ExFiles\Box 96\2\ scan0267 | |
| Date | 2nd November 1937 guessed | |
| -6- Condition of S/ZN, cloud burst hardened, and plated tappets after 30 mins. at 4000 r.p.m., 25 mins. at 4250 r.p.m, and 5 mins. at 4500 r.p.m. No. How Set. Condition _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ A.1 Auto. Lightly scratched. Fairly bad groove .025 A.2 Auto. ditto A.3 .008 Bad groove .050 wide. A.4 .006 Good surface. Groove hardly perceptible. A.5 .006 ditto A.6 .008 Bad groove .050 wide _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ A.7 Auto Slightly marked A.8 Auto Not marked. Good condition. A.9 .006 ditto A.10 .008 ditto A.11 Auto ditto A.12 Auto ditto _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ No. How Set. Condition. Type. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ B.1 Auto Slight groove B.2 Auto Bad groove .050 wide. S/ZN. cloud-burst hardened. B.3 .008 ditto B.4 .006 ditto B.5 Auto Groove .025 wide B.6 Auto Bad groove .050 wide. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ B.7 .008 Not marked. Good condition. B.8 .006 ditto B.9 .006 ditto S/ZN Plated B.10 .008 ditto B.11 Auto ditto B.12 Auto ditto _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ No tappet return springs A.{Mr Adams} side. D.CR.{Mr Cra???ster / Mr Chichester}Lee. | ||