Dictionary:Fig S-4

From SEG Wiki
Jump to navigation Jump to search
ADVERTISEMENT
Segs4.jpg

FIG. S-4. Seismoscope. This Chinese seismoscope dates from about 100 A.D. An earthquake would upset an inverted pendulum (fastened to the base of the vase) and knock a ball from the dragon’s mouth into the toad’s mouth to indicate the direction from which the temblor came.