The video shows a real-time oscilloscope display of the SGG output produced in response to 5 cm Pb and Al cubes mounted on a 50 cm diameter turntable rotating with a 28 second period.  The turntable is located just outside the cryostst.  The delay between the time of closest approach of each cube to the cryostat and the time of appearance of the corresponding extremum on the oscilloscope display is due to a 0.8 Hz low pass filter.

For comparison, the graph below shows the expected signal for a noiseless instrument.