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).
Main switch magnet circuit and interlock system for a Super Sports sequence starter.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan107 | |
| Date | 14th January 1927 | |
| To R.{Sir Henry Royce} from EFC. c. By.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} c. BJ. Da.{Bernard Day - Chassis Design} c. Mr. Claremont. EAC.10. SUPER SPORTS. SEQUENCE STARTER. We have your HL/M9.1.28. We note in your paragraph dealing with the B. or main switch magnet circuit, you say that this goes through the main switch coil and "upper half of the hold-out coil". We were not previously aware of any idea of circulating this B. current round the hold-out core, this not having been shown or indicated previously. Also we do not at the moment see why it should be necessary, in view of the fact that the operation of the main switch coil core drawing down its armature, takes with it positively the armature of the hold-off coil core until it makes the hold-off contacts which pass the hold-off current. Such feature was not shown on your LeC.2298 giving the first conceived arrangement of the interlocked duplex switch. Another point we have noted in our more recent examination of these matters is that there is a further point of difference, not previously referred to, between the mechanical interlock and the old electrical interlock, viz. that whereas in the electrical inter-lock the teazer circuit is not broken until after the main heavy current circuit is made, and the voltage across the teazer contacts at break is therefore very small, in this mechanical interlock system the teazer circuit is broken before the heavy current circuit is made and the full voltage of the break of the teazer circuit has then to be taken by the break. There are, however, as you observe, Contd. | ||