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).
Specifications for a 50% stronger bonnet catch spring (PII).
| Identifier | ExFiles\Box 11\3\ 03-page293 | |
| Date | 14th November 1930 guessed | |
| 50% STRONGER BONNET CATCH SPRING. (PII) FREE LENGTH = 3.332" INSIDE DIAMETER OF HELIX = .269" SIZE OF WIRE (15 S.W.G) = .072" DIA NUMBER OF WORKING COILS = 26, (PLUS AN EXTRA COIL AT EACH END GROUND SQUARE, MAKING 28 COILS IN ALL) MATERIAL = S/CV SPRING TO SUPPORT A LOAD OF 30.0 LBS WHEN COMPRESSED TO A LENGTH OF 2.575" THIS SPRING REPLACES E 76528 | ||