Fact of the day
A seismometer that weighed a full 15 tons
Before modern electronics, scientists built giant spring-and-pendulum instruments. The largest of them weighed about 15 tons.
Source: United States Geological Survey
ShelterShelterFact of the day
Before modern electronics, scientists built giant spring-and-pendulum instruments. The largest of them weighed about 15 tons.
Source: United States Geological Survey