A field rheostat is provided to adjust the field strength of B.
Carefully, Ishie lowered the field strength, eye on the readout panel.
The field strength may be further regulated by the rheostat R.
The third method, that of variation of field strength, is the one in general use.
Carefully he nudged the field strength back up, and suddenly there were seven hundred ten pounds indicated thrust.
The field strength of the electromagnets, controlled by rheostats, instantly shaped the charge into a glowing ball of fire!
The slightest variation in field strength triggered an instant response from the ball of energy.