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).
Results of comparative life tests for switchbox and cut-out contacts.
| Identifier | ExFiles\Box 65\2\ scan0023 | |
| Date | 28th February 1929 | |
| SP{Mr Spinney} X7730 To R.{Sir Henry Royce} from EFC. c. to Sg.{Arthur F. Sidgreaves - MD} E.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} WGF. PN.{Mr Northey} EFC1/B28.2.29. SWITCHBOX AND CUT-OUT CONTACT LIFE TESTS. We have now completed a satisfactory series of four comparative tests of switchbox and cut-out contact life tests, the operation of the switch being performed mechanically at a frequency of about 30 per minute, and the number of operations being recorded by a small counter. The four cases referred to are :- Positive of shunt coil of Field break in cut-out connected to relation to armature dynamo terminal. break. B Before B After C Before C After The detail results of these tests are contained in my assistants report A.D.28 attached, from which it will be seen that we have finally confirmed our recommendation of adopting for standard the arrangement in which the positive of the shunt coil of the cut-out is connected to dynamo terminal C and the field breaks first on the charging switch, i.e. before the armature break. We are keeping the actual contacts for inspection in case you would care to inspect these on your return from Le CanadelHenry Royce's French residence. EFC. | ||