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).
Continued test procedure for an electrical coil, outlining steps for performance evaluation under various conditions.
| Identifier | ExFiles\Box 69\1\ scan0195 | |
| Date | 23th April 1929 guessed | |
| -2- Contd. (6) The coil shall be run for 5 hours under standard conditions at a voltage of 17.5, 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 at 12 volts. (8) Ascertain if necessary, the primary current consumption at 12 volts with varying speeds of the distributor but under otherwise standard conditions. (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 at atmospheric temperature shall be connected to a suitable spark gap and a measure of the maximum voltage delivered by the coil at 12 volts under standard conditions obtained by ascertaining the maximum gap which the coil will just spark over. (11) The coil shall now be heated in a reasonably dru atmosphere at varying temperatures up to 100°C, and the performance at 12 volts on a variable subsidiary gap in series with the six main gaps noted for each temperature. Following this test the coil shall be run normally but at 17.5 volts for 5 hours in the oven with the oven temperature | ||