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).
Inquiry to The Lion Spring Co. regarding the manufacturing process of valve springs made from Swedish wire.
| Identifier | ExFiles\Box 158\4\ scan0094 | |
| Date | 2nd November 1936 | |
| 1360 Expl. Dept. Rm.{William Robotham - Chief Engineer}11/MJ. 2nd. November, 1936. The Lion Spring Co., Oldbury, BIRMINGHAM. Dear Sirs, We understand that you are producing valve springs from Swedish wire. We are interested to know whether these springs are coiled in the hard condition, or whether they are coiled in the soft condition and subsequently hardened and tempered. Yours faithfully, For Rolls-Royce Ltd. | ||