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).
The bow spring type of control for a relief valve.
| Identifier | ExFiles\Box 66a\4\ scan0019 | |
| Date | 22th July 1926 | |
| To E.{Mr Elliott - Chief Engineer} (crossed out) C. Hs.{Lord Ernest Hives - Chair} x8205 BY/Cgh{W Clough}10/K.{Mr Kilner} 22. 7. 26. BOW SPRING TYPE OF CONTROL FOR RELIEF VALVE. With reference to E2/M19.7.26., the two sides of the bow on the model submitted were, of course, equal in length, and in accordance with your LeCs. but the latter do not show washers beneath the springs which apparently puts the matter in order. BY/Cgh.{W Clough} [STAMP] RECEIVED 23 JUL 1926 | ||