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 results for engine compression and maximum explosion pressure.
| Identifier | ExFiles\Box 19\7\ Scan003 | |
| Date | 17th October 1907 | |
| X790 4400 Compressions & Maximum explosion pressure Test 60592. with gauged non return. valve. (see timing record.) With no slack inlet. - max. compression. 59 lbs □, above — .005 — 60 20 63. soon cuts to 1/8 slack. then falls off.. with 60 comp. max explosion as gauged. 275 lbs □ on No 60592 17/10/07 VP. | ||