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).
Analysis of coil failures, attributing them to a combination of mechanical stress and excessive voltage.
| Identifier | ExFiles\Box 69\1\ scan0318 | |
| Date | 7th March 1930 guessed | |
| (2) W.E.7 [In margin: could] has been caused by mechanical stress of the paper under the conditions described above. However the voltage must also have been excessive as 3 turns of paper even under these conditions should stand up to the normal layer to layer voltage (not more than 200 volts). Coil NO HX-55 ex chassis 180R. The fault in this coil was similar to the coil (OP85) above and due to a similar cause e.g. overlapping of the connecting flex. Whilst both of these failures seem to be due to mechanical stresses there does seem an indication also of excessive voltage although unfortunately up to the present we have not consistently been able to prove this. H.E.W. | ||