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 report page detailing breakdowns and utility tests on various magneto machines.
| Identifier | WestWitteringFiles\F\February1921\ Scan81 | |
| Date | 10th December 1920 | |
| R.R. 235A (100 T) (S.H. 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 -6- EFC4/T3.2.21. Contd. on the two Z.R.6 machines, but on this test the B.6 machine broke down across the brush holder of the high tension brush conducting the current from the armature to the distributor, and the discharge throughout most of the test was taking place here instead of at the safety gap. (12) A short test of 15 minutes at 1500 R.P.M. with timing lever central and the discharges taking place on 5.5 mm. gaps in air, with standard lengths (2 ft) of high tension cable as usual was now taken to see that the machine was normally correct after open circuit test. The two Z.R.6 machines were O.K., but it was found on this test that the B.6 had broken down as explained. N.B. The E.6 Watfords would not spark regularly on 5.5 mm. gaps on this test, but discharged across the safety gap. (13) Utility Tests. In the utility tests explained in our EFC2/T7.1.21, leakage paths as follows are connected across one of the six gaps with the magneto running at 1500 R.P.M. and the greatest length of regular spark obtainable in each case ascertained. (a) Nothing connected across. (b) The secondaries of two Remy coils in series connected across, one Remy primary being short circuited. (c) Ditto, but with both Remy primaries short-circuited. (d) The secondary of one Remy coil only connected across with its primary short circuited. Contd. | ||