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).
Rating test results for Peregrine Tappet and Valve springs, showing deflection under various loads.
| Identifier | ExFiles\Box 56\2\ Scan118 | |
| Date | 24th May 1932 | |
| X4701 PEREGRINE FILE "PEREGRINE" SPRINGS RATING TEST. TAPPET SPRING LOAD LB. 5 10 15 20 25 DEFLECTION. INS. .098 .195 .285 .376 .468 VALVE SPRING. LOAD LB. 20 40 60 80 DEFLECTION. INS. .295 .580 .840 1.020 | ||