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).
Continued test procedures for a relay switch unit.
| Identifier | ExFiles\Box 64\3\ scan0198 | |
| Date | 1st March 1925 | |
| X8650 contd :- -4- EFC4/E5.3.25. ---------- (5) Now verify that the main spring tension (combined rating and set) is such that with a current of 3.0 amperes passing through the fine winding, a load of at least 3.0 lbs. measured at the core on a spring balance is required to break contact of the lower contacts. (6) Whilst still warm from test (5) an alternating voltage of 205 shall be applied, through a lamp, between the windings (both) and the base, for one minute without break-down. (7) The final test of this relay switch unit is to consist of testing under approximate operating conditions as described in Section III. EFC. | ||