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 electrical operation of a cut-out, detailing reverse current tests that exceed specified limits.
| Identifier | ExFiles\Box 48\3\ Scan172 | |
| Date | 22th December 1920 | |
| Contd. (2) EFC {E. Fowler Clarke - Electrical Engineer} 2/T22.12.20. voltage between the cold and hot conditions is secured, also probably more reliability of the contacts. The reverse current, however, is by no means reduced to zero, in fact our careful test of the first sample as received showed the reverse amperes in the cold condition to be 2.6 and in the hot condition 2.4, the limit given in our specification of electrical operation of cut-out for R.R. car being 2.0. We afterwards improved this reverse current respectively to 1.1 and 1.5 by the insertion of additional resistance. We would like to know why the makers do not put in even a little more resistance than they do, as we appeared to find such an addition advantageous and to bring the operation within our specified limits. EFC. {E. Fowler Clarke - Electrical Engineer} R.R. 386A (100 T'ls, H 169. 11-8-11) C 2500 | ||