Oldest Functioning Seismograph - and why

Thread starter Tom.G
Start date Dec 20, 2018

Dec 20, 2018

Tom.G

Science Advisor

Gold Member

A 3.5 minute video.

In the construction industry that's one version of a Headache Ball. You dangle it from a crane and swing it at the building you are demolishing. Ouch!

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jedishrfu

Mentor

Insights Author

Pretty cool and history too!

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