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).
Observations on spring arrangements and the rigidity of supports and fixed contacts.
| Identifier | ExFiles\Box 50\1\ Scan072 | |
| Date | 1st June 1925 | |
| Contd. -2- EFCB/T3.6.25. observations so far seem to show that the best arrangement is the rigid plate on the top of the springs, together with a rigid support. In any case we now definitely assert that the support of the fixed contact must be made rigid, even if it results in a somewhat more expensive piece. It is quite likely that the weaker spring, together with the rigid fixed contact point support would be equally effective and possibly more so than the other arrangement, but it is, as stated, a fact that the result of the C arrangement, which it so happens has had the most running during the holiday, is the most satisfactory so far. I do not now think it will be necessary to go to steel springs to get the result desired. EFC. {E. Fowler Clarke - Electrical Engineer} | ||