Uniformed identical seismic sensor
1 Pendulum.
2. Bearing.
3. Spring suspension of pendulum.
4. Capacitance transducer.
5. Moving-coil transducer.
6. Electric motor for automatic aero adjustment.
7. Weight adjustment.
8. Operating holding device.
9. Foundation.
10. Holding devices for use during transportation.
11. Mounting screw for attaching seismometer to plate.