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).
Graphs showing load vs. deflection spring ratings for 'Peregrine' Tappet and Valve springs.
| Identifier | ExFiles\Box 56\2\ Scan119 | |
| Date | 24th May 1932 | |
| "PEREGRINE" SPRING RATINGS TAPPET SPRING DEFLECTION - INS - LOAD (LBS) SPRING RATING = 53.53 LBS/INCH CHOC - A - BLOC VALVE SPRING DEFLECTION - INS - LOAD (LBS) AVERAGE SPRING RATING = 79 LBS/INCH CHOC - A - BLOC | ||