Shown is a GE type M-16 demand meter that I just recently acquired. It uses a Telechron timing motor, which is a type of synchronous motor, but on a smaller scale. This meter requires an external device to actuate the demand register. The timing motor basically resets the demand meter's pointer pusher every 30 minutes. The actual pointer has to be manually reset after each reading. The pusher is a device that pushes the meter's demand pointer to the proper reading. The pointer stays in place after the pusher returns to zero. It's really very pushy! hee hee!