(under subclass 80) Subject matter wherein the excitation circuit resistor is a pressure variable resistor.
(1) Note. Although the usual pressure varied resistor takes the form of a carbon pile, this subclass is not restricted thereto.
SEE OR SEARCH THIS CLASS, SUBCLASS:
17, for generator systems within the class definition wherein the generator is automatically controlled in response to a condition (as a pressure condition), see indented subclass 35 for such automatic control systems where the generator is controlled in response to fluid pressure.
35, for fluid pressure responsive generator control.
SEE OR SEARCH CLASS
318, Electricity: Motive Power Systems, 481, for electric motor control in response to pressure in a fluid or granular material and subclass 533 for motor field circuit control including pressure varied resistor.
320, Electricity: Battery and Condenser Charging and Discharging,
70, for generation systems for battery charging with pressure varied impedance field circuit control.
323, Electricity: Power Supply or Regulation Systems,
295, for resistance systems including pressure varied resistors.
338, Electrical Resistors,
36+, for fluid or gas pressure actuated electrical resistors, and subclasses 99+ for electrical resistors of the compressible type.
