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).
Instructions for the inspection and maintenance of the main switch contacts.
| Identifier | ExFiles\Box 26\2\ Scan131 | |
| Date | 19th July 1917 guessed | |
| -17- Contd. MAIN SWITCH. The copper and carbon contacts of the main switch should be inspected occasionally, as the carbon will very gradually become burnt away. It is very important that the original condition of the main switch in which the carbons make contact first and break last be maintained, and for this purpose spare carbon contacts are supplied. To test this point operate the switch by hand, applying the force direct to the armature lever carrying the copper contact and not to the top lever carrying the carbon contact. This will allow the motor to run light without being put into gear. Any flashing at the copper contacts will then indicate that the carbon contacts require renewal. Keep the switch on only momentarily. The copper contact surfaces should ordinarily be kept in a clean condition by the application of a very small amount of vaseline. Should they have become pitted or discoloured, however, they should be carefully treated with fine glass paper, and re-vaselined. Should it be necessary to remove the main switch heavycurrent connections, it is very essential that these be correctly replaced, as otherwise the action of the system will be interfered with. It is also necessary to be sure that clean and sound electrical connections be re-obtained owing to the heavy current which these have to carry. Contd. | ||