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).
Technical discussion on the operation of the dynamo charging system, auto-switch, and headlamp controls.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 105 | |
| Date | 28th January 1927 | |
| Contd. -2- EFC4/T28.1.27. This phenomenon also occurs if, while running, the charging switch is switched off and switched on again, the rise of dynamo voltage being even more rapid in this case. On the other hand if, when the auto-switch is on reduced rate of charge, the headlamps be switched on and off again, this enables the auto-switch to recover its "on contact" position, and enables full charge to be restored. Thus, with the charging switch and the headlamp switch and the auto-switch as at present arranged, a manual control of the operation of this latter, i.e. a manual control of the rate of charge, is possible, though this is not of course really what we want. In order to ensure that full charge shall be given on running up or on switching charge off and on again, we are now taking the negative end of the auto-switch shunt coil to earth, i.e. we are giving it the same connection as has been suggested for the voltmeter, and the coil will therefore be, as in the case of the voltmeter, connected to the battery when the charging switch is put on. This is no disadvantage, it being already the case that the ignition current may be left on if the charging switch is not put off. In passing it may be mentioned that in our opinion the danger of this type of switch being left on is very much less than it used to be with our steering column rotary ignition switch. One so easily forms the habit of feeling that the two switches on the present switchbox are in the off position. | ||