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).
Test procedures for an electrical switch, including contact and insulation checks.
| Identifier | ExFiles\Box 56\4\ Scan083 | |
| Date | 11th February 1926 guessed | |
| -2- Contd. difference due to the presence of the tube. All the readings should lie between the limits 7 lbs. and 9 lbs. (unlubricated). (4) Now re-assemble the switch and connect up in a starter motor or other inductive circuit and cause the switch to make and break a few times in order to mark the contacts on which the break is taking place, at the same time it should be noted whether there is any tendency for the plunger to stick in the "on" position, or in any way to work harshly. It is intended also to confirm by this test that the break is taking place on the outer contacts only. (5) After re-assembling the switch, apply an R.M.S. pressure of 200 volts between the two terminals of the switch and afterwards between the terminal corresponding to the outer contacts and the case, each for a period of one minute (through a lamp) thus proving that the insulation is O.K. EFC. | ||