YeRTicAL SEISMOMETER 
(@2) 
Ee GOUed spring. suspended at @, 
ronds Crer.._pivoted at b. and connected 
with sprig wire atl, 
Pron. LUV, Lhrovghend of lever the point 
Testiig against glass.............6. 
TT side turned orer av edges 
for glass (G) to slide in. 
yo 
