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).
Test results of a 'Scott Cut-Out' apparatus under cold and hot operating conditions.
| Identifier | ExFiles\Box 50\2\ Scan080 | |
| Date | 15th December 1920 | |
| To R.{Sir Henry Royce} from EFC. c. to CJ. c. to Ej. c. to Da.{Bernard Day - Chassis Design} c. to Hy.{Tom Haldenby - Plant Engineer} c. to Bn.{W.O. Bentley / Mr Barrington} c. to EWT. for R.R.Inc. X.4296 EFC1/T15.12.20. X.4296 - SCOTT CUT-OUT. This cut-out was taken from some Scott apparatus which we have had by us during the War. The cut-out is rather compact, it being made with an iron clad magnetic circuit. We thought the results of tests of this cut-out might be of value to us compared with other cut-outs which we knew. We are sending on the instrument under separate cover to Mr. Royce for his examination. The figures have been taken without making any alteration to the cut-out adjustment and are as follows :- Cut-out cold (18ºC) Volts and amps. on shunt coil to just cause full electrical contact = 13.7 volts, .115 amp. (119 ohms). Volts and amps. on shunt coil to allow contacts to fall apart (battery disconnected) = 10.2 volts .086 amp. (118.5 ohms) Volts and amps. on shunt coil and reverse series amps. to allow contacts to fall apart (battery connected) = 12.0 volts, .090 amp. series amp. -.5 Hot condition. (After cut-out in operation for two hours carrying 10 amperes through its series coil). Volts and amps. on shunt coil to just cause full electrical contact = 16.8 volts, .115 amps. (146 ohms) Volts and amps. on shunt coil to allow contacts to fall apart (battery disconnected) = 12.0 volts, .086 amp. (146.5 ohms). Volts and amps. on shunt coil and reverse series amps to allow contacts to fall apart (battery connected) = 12.6 volts, .085 amp. series amp. 0 Contd. | ||