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 Clutch Spring, Per II.
| Identifier | ExFiles\Box 169\4\ img092 | |
| Date | 6th July 1932 | |
| Hs{Lord Ernest Hives - Chair} 667 DIA OF WIRE .176 INSIDE DIA OF HELIX .640 - 5 8 WORKING COILS WITH 1/2 A COIL GROUND SQUARE EACH END MAKING A TOTAL OF 9 COILS LOAD AT 1.775 TO BE 177 lbs [70000 lbs/sq"] FREE LENGTH 2.310 R= 330 lbs /IN S= 126000 lbs/sq"/IN ROLLS-ROYCE LTD. PRINT ROOM JUL 6 1932 DERBY. CLUTCH SPRING PER II | ||