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).
Extract discussing the number of contacts required for the main charging switch and vibrator regulator on a Lucas Junction Box.
| Identifier | ExFiles\Box 31\1\ Scan039 | |
| Date | 24th May 1919 | |
| R.R. 255A (500 T) (S.D. 408. 28-4-17.) Bm. 2/156/13. Extract from EFC4/T24.5.19. LUCAS JUNCTION BOX. ------------------- Vibrator Regulator X.3886. 1402. (1) For the main charging switch, it is necessary to have an additional contact, that is to say, to amke joint between three points simultaneously, so that when the charging switch is off, the field circuit of the dynamo is also disconnected. In case we use the Lucas dynamo with our own distributor and switchboard, it would be desirable to have yet another contact, so that the control winding may be onen circuited when the main charging switch is put in the off position; this is not absolutely necessary however. Messrs. Lucas are providing these 4 contacts on their new board, although on their previous board they only provided 3. When we finally come to the vibrator regulator control it would not be so necessary to have the three contacts, because the dynamo voltage will only stay at normal when the charging switch is off, but it would still be desirable, and we would rather see it done, to use the three contacts and disconnect the field ciruit. EFC. | ||