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 table for a Lucas Cut-Out, showing operational data under cold and hot conditions.
| Identifier | WestWitteringFiles\D\May1920\ Scan36 | |
| Date | 5th May 1920 | |
| X.3770. LUCAS CUT-OUT. TEST TABLE. 5.5.20. Cut-out number. | Cold or Hot. | Just operated at | Just de-operated at | Shunt Ohms. | Remarks. Shunt Volts. | Shunt Amperes. | Shunt Volts. | Shunt Amps. | Series Amps. | Series Volts. 19 | C | 12.45 | .27 | 12.25 | .265 | .1 | | 46.2 | Passes as good cut-out. | H | 14.2 | .245 | 13.4 | .235 | .5 | .016 | 57.8 | 29 | C | 9.8 | .225 | 11.7 | .27 | 4.4 | | 43.4 | Cuts in too early and takes too much reverse current. | H | 10.6 | .20 | 13.0 | .25 | 2.7 | .096 | 52.5 | 91 | C | 14.1 | .28 | 12.1 | .24 | 1.95 | | 50.3 | Cuts in too late and mechanically indefinite. | H | 14.7 | .24 | 13.4 | .22 | 1.4 | .045 | 61.1 | 128 | C | 10.2 | .20 | 11.9 | .235 | 3.55 | | 50.3 | As for 29. | H | 10.5 | .18 | 13.0 | .225 | 3.4 | .128 | 58.0 | 14267. | C | 11.4 | .22 | 11.9 | .25 | 1.7 | | 51.8 | Cuts in a little too early. | H | 12.6 | .21 | 13.1 | .22 | 1.6 | .054 | 59.8 | 15770. | C | 13.4 | .30 | 11.8 | .28 | 1.15 | [unclear] | 43.9 | Cuts in somewhat too late. | H | 15.9 | .29 | 13.0 | .24 | .75 | .027 | 54.5 | R.{Sir Henry Royce} R.{Sir Henry Royce} 235A (100 T) (S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 643, 19-2-20) G 2618 | ||