It is a seismometer for the shifting ground of British politics.
Seismom′etry, the measuring the phenomena of earthquakes; Seis′moscope, a name of the simpler form of seismometer.
Unfortunately this fate was shared by a seismometer that had been set up on the island.
Seis′mogram, the record made by a seismometer; Seismog′rapher.
In due time they reach, say the Isle of Wight, where they set the pencil of the seismometer at work.
This is the old Cacciatore seismometer which has been long employed in Italy.
A detecting device that receives seismic impulses. It is the detecting component of a seismograph. See more at seismograph.