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).
Testing procedures for a switch, specifying contact pressure and voltage tolerance tests.
| Identifier | ExFiles\Box 168a\2\ img265 | |
| Date | 30th November 1936 guessed | |
| -3- by means of a spring balance that the switch is definitely capable of holding on contact with this current flowing, with a copper contact pressure of at least 2.0 lbs.wt. This should be measured by hooking a spring balance to a .187" square non-magnetic bar held against the underside of the copper contacts immediately adjacent to the edge of the iron armature. (3) Whilst still warm from above test, an alternating voltage of 200 shall be applied, through a lamp, between the windings including the non-inductive resistance coil, and the switch arm; and also between the main switch contact pillar and the switch arm; for one minute without breakdown. Hm{Capt. W. Hallam - Head Repairs}/Wst. | ||