THE CONDITION MONITOR PROVIDES INFORMATION AS TO THE STATE OF A MONITORED DUAL STATE DEVICE HAVING, FOR EXAMPLE, POSSIBLE SATISFACTORY AND SATISFACTORY CONDITIONS. USE IS MADE OF A PASSIVE RADIO TRANSDUCER ELEMENT POWERED WITHIN A MOVING DEVICE BY A REASONANT MECHANICAL SYSTEM EXITED PRIMARILY BY CYCLIC ACCELERATIONS. IN THE UNSATISFACTORY CONDITION OF THE MONITORED DEVICE, THE PASSIVE TRANSDUCER EMITS ACHARACTERISTIC SIGNAL WHICH IS DETECTED AT A STATIONARY STATION FOR THE OPERATION OF A SUITABLE ALARM OR REMEDIAL CONTROL. IN THE NORMAL OR SATISFACTORY CONDITION OF THE MONITORED DEVICE, THE PASSIVE TRANSDUCER IS DORMANT.

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