(under the class definition) Subject matter wherein the oscillator is combined with means distinct from the oscillator system or wherein the means is a modified element of the oscillator, which means is responsive to a nonelectrical condition external to the oscillator, a current characteristic of the oscillator, (e.g., amplitude or frequency) being varied in accordance with changes in the sensed condition.
(1) Note. The condition sensing means may, for example, comprise means responsive to (1) presence or absence of a material body, (2) moisture or humidity, (3) temperature, (4) light, (5) pressure, (6) liquid level, and so forth.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1+, for oscillators with automatic frequency stabilization wherein means are employed to sense a drift in oscillator frequency and to effect a tuning of the oscillator in the proper direction to maintain the oscillator frequency constant.
62, for oscillators having means to sense an undesirable condition in the oscillator and responsive thereto to correct the condition or so control the oscillator to prevent damage to the oscillator.
69, and 70, for oscillators having means to modify the temperature of the oscillator or a part thereof in response to temperature changes in the oscillator or the relative temperature change of the oscillator and its ambient medium.
176, for oscillators whose frequency is stabilized by a temperature or current responsive means in the oscillator circuit.
SEE OR SEARCH CLASS
73, Measuring and Testing, appropriate subclasses, for measuring and testing apparatus involving sensing means for making physical measurements or tests not provided for in other classes. See also, the Notes to the class definitions and under "SEARCH CLASS" as to condition sensing means classified in other classes. See particularly under (3) Note, section C, of the class definition of Class 73 as to various electrical devices and electrical systems classes which utilize condition responsive controls.
332, Modulators, appropriate subclasses for modulated oscillators combined with specific intelligence source (e.g., electro-acoustic transducer).
369, Dynamic Information Storage or Retrieval,
129, for a phonograph circuit with an information modulated oscillator.
