Page detailing test procedures for an electrical cut-out, noting voltage and amperage at different speeds.
| Identifier | ExFiles\Box 36\4\ scan 036 | |
| Date | 14th May 1920 | |
| W.R. 238a (100 T) S. G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 643. 19-2-20 G 2618 Contd. -5- EFC {E. Fowler Clarke - Electrical Engineer} 1/T14.5.20. (2) After the operation of the cut-out the speed was re-adjusted to the same figure as for (1) and with the cut-out still in the "on" position, the voltage and the amperes to or from the battery were noted. (3) The speed was then allowed to fall until the cut-out just broke contact, at which instant the voltage, speed and reverse amperes through the series coil were noted. (4) After the falling away of the cut-out the speed was re-adjusted to the same value as for (3) and the dynamo open circuit voltage at that speed again noted. Any tendency to buzz at the cutting in point was counteracted by holding the cut-out in place by hand. Incidentally it would appear that the relation of the two curves mentioned above should be so arranged that no tendency to buzz could exist even if, at the moment of making contact, the dynamo volts were slightly lower than the battery volts, and a reverse current resulted. That is to say, for the last portion of the gap the spring tension should not increase at the same rate as the magnetic traction consistent with the apparatus not taking too large a reverse current to bring it off. Contd. | ||
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).