Recorders having a record tracer portion operative upon a record receiver, said tracer portion being responsive to the motion of a tine of a tuning fork, or to the change in inclination of a body carrying a pendulous mass or to the displacement of a mass due to shocks or accelerations.
SEE OR SEARCH CLASS
33, Geometrical Instruments,
308+, for pendulum directed recorders utilized in indicating borehole inclination and subclass 331 for direction sensing and indicating devices utilizing a recorder.
73, Measuring and Testing,
570+, for a test of vibration, or involving vibration of the test specimen; subclass 489 for an accelerometer with recording means; and subclasses 514+ for an accelerometer, per se.
84, Music,
457, for tuning forks.
181, Acoustics, 122, for mechanical seismographs.
324, Electricity: Measuring and Testing,
162, for electrical accelerometers.
367, Communications, Electrical: Acoustic Wave Systems and Devices,
