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).
The voltage required to operate Lucas and Smith cut-outs under battery and dynamo test conditions.
| Identifier | WestWitteringFiles\D\March1920\ Scan48 | |
| Date | 16th March 1920 | |
| Contd. -4- Ck{Mr Clark}2/T16.3.20. Voltage to operate cut-outs. | | on Battery test. | On dynamo test. | |---|---|---|---|---| | | Cold. | Hot. | Cold. | Hot. | | Lucas A.{Mr Adams} | 13.1 (later 12.6 - 12.8 | 15.5 | 12.2 | 16.0 | | Lucas B. | 15.5 (later 11.0 - 16.0 | 17.0 | 11.4 | 16.0 | It should be stated that in the above table the hot condition on the dynamo test was at a somewhat higher temperature than the hot condition on the battery test. In the case of the Smith cut-out, owing to the change of adjustment, we give the comparative figures for cold condition only, which are as follows :- | | Battery test cold. | Dynamo test. cold. | |---|---|---| | Smith (1) | 13.9 - 14.8 | 12.5 | | Smith (2). | 13.2 - 13.9 | 12.5 | The complete results of the tests now being reported for the two Lucas cut-outs A and B and for another Lucas cut-out C, also for the two Smith cut-outs, are exhibited in the following tables. The first column refers to condition (1),(2), (3) or (4) described above. The last column gives the Contd. (Upside down text at bottom): R.R. 235. 10,000. 6-8-19. Cl. 2460. | ||