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).
Specification sheet for a clutch spring, including dimensions and load ratings.
| Identifier | ExFiles\Box 169\4\ img139 | |
| Date | 1st March 1933 | |
| Hs{Lord Ernest Hives - Chair} 938 DIA OF WIRE .104 INSIDE DIA OF HELIX .270 4 WORKING COILS WITH 3/4 COIL GROUND SQUARE EACH END) TOTAL COILS 5 1/2 LOAD WITH ~ .100 COMPRESSION 84 lbs FREE LENGTH 1.175" + 25 RATING OF 840 lbs / IN TO BE ADJUSTED BY TYPE OF END COILS SPRING - PER CLUTCH RR&H 299 Stamp: ROYCE, LTD. DRAWING ROOM MAR 1 1933 DERBY. 12 OFF | ||