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).
Page of a magneto test procedure outlining various electrical load and spark gap conditions.
| Identifier | ExFiles\Box 4\5\ 05-page300 | |
| Date | 2nd September 1924 guessed | |
| -3- Contd. (a) Nothing connected across. (b) The secondaries of the two Remy coils in series connected across, one Remy primary to be 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. The magneto shall again be run at 1500 r.p.m. and the greatest length of gap possible under the varying conditions (a), (b), (c) and (d) obtained for one gap of the six, across which the secondary coils are connected. Lengths of H.T. leads assumed always to be 2 feet, and timing lever central when there is no automatic advance, and fully advanced by the hand range when there is automatic advance. (11a) Additionally or alternatively, the magneto shall be subjected to another utility test. For this purpose a 3.0 mm. annular spark gap (dia. of central electrode .087", inside dia. of earthed electrode .325") in air shunted by a non-inductive chemical leak of value 3 micromhos shall be arranged to replace one of the six test gaps sparked by the magneto in (d) above, the remaining five gaps being set as before to 5.5 mm. The speed range over which the magneto is capable, for all positions of the hand range lever, of firing this special test gap with shunted leak regularly, shall be determined. Contd. | ||