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).
Continuation of test procedures for an electrical coil, detailing various performance and endurance tests.
| Identifier | ExFiles\Box 69\1\ scan0128 | |
| Date | 24th July 1928 guessed | |
| -2- Contd. (6) With the make and break as above, the coil shall be run for 5 hours at a voltage of 17.5 under similar standard conditions as before, and the secondary resistance again measured after the run, and the temperature of the coil calculated as in (5) above. Also note the primary current at the conclusion of the run. The ambient temperature should again be noted. (7) The coil H.T. supply shall now be connected to a standard leaky gap (as specified for magneto work) and the speed limit for satisfactory operation noted (the make and break as above and standard ballast in series, using a 12 volt supply). (8) Ascertain the primary current consumption at 12 volts with varying speeds of the distributor (std. ballast in series and .55 make ratio as above). (9) Observations shall be made of the coil performance on the 5.5 mm. gaps at voltages of 10 and 8, also the maximum speeds at which the distributor can be run for each voltage to maintain regular sparking. (10) The coil shall now be heated in a dry atmosphere at varying temperatures up to 100°C and cooled down again to atmospheric temperature, and the performance at 12 volts on a variable subsidiary spark gap noted for each temperature. (11) An endurance test of 500 hours duration shall be carried out on the coil at 17.5 volts at normal speed on the standard rig. Contd. | ||